jdk/src/share/classes/java/util/Scanner.java
author alanb
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parent 2057 3acf8e5e2ca0
child 3631 4dc04372d56b
permissions -rw-r--r--
6838333: New I/O: Update file system API to jsr203/nio2-b101 6844313: New I/O: File timestamps should be represented by a FileTime rather than a long+TimeUnit Reviewed-by: sherman
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/*
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 * Copyright 2003-2009 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Sun designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Sun in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 */
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package java.util;
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import java.nio.file.FileRef;
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import java.util.regex.*;
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import java.io.*;
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import java.math.*;
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import java.nio.*;
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import java.nio.channels.*;
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import java.nio.charset.*;
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import java.text.*;
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import java.util.Locale;
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import sun.misc.LRUCache;
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/**
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 * A simple text scanner which can parse primitive types and strings using
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 * regular expressions.
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 *
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 * <p>A <code>Scanner</code> breaks its input into tokens using a
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 * delimiter pattern, which by default matches whitespace. The resulting
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 * tokens may then be converted into values of different types using the
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 * various <tt>next</tt> methods.
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 *
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 * <p>For example, this code allows a user to read a number from
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 * <tt>System.in</tt>:
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 * <blockquote><pre>
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 *     Scanner sc = new Scanner(System.in);
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 *     int i = sc.nextInt();
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 * </pre></blockquote>
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 *
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 * <p>As another example, this code allows <code>long</code> types to be
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 * assigned from entries in a file <code>myNumbers</code>:
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 * <blockquote><pre>
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 *      Scanner sc = new Scanner(new File("myNumbers"));
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 *      while (sc.hasNextLong()) {
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 *          long aLong = sc.nextLong();
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 *      }</pre></blockquote>
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 *
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 * <p>The scanner can also use delimiters other than whitespace. This
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 * example reads several items in from a string:
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 *<blockquote><pre>
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 *     String input = "1 fish 2 fish red fish blue fish";
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 *     Scanner s = new Scanner(input).useDelimiter("\\s*fish\\s*");
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 *     System.out.println(s.nextInt());
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 *     System.out.println(s.nextInt());
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 *     System.out.println(s.next());
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 *     System.out.println(s.next());
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 *     s.close(); </pre></blockquote>
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 * <p>
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 * prints the following output:
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 * <blockquote><pre>
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 *     1
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 *     2
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 *     red
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 *     blue </pre></blockquote>
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 *
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 * <p>The same output can be generated with this code, which uses a regular
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 * expression to parse all four tokens at once:
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 *<blockquote><pre>
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 *     String input = "1 fish 2 fish red fish blue fish";
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 *     Scanner s = new Scanner(input);
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 *     s.findInLine("(\\d+) fish (\\d+) fish (\\w+) fish (\\w+)");
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 *     MatchResult result = s.match();
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 *     for (int i=1; i<=result.groupCount(); i++)
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 *         System.out.println(result.group(i));
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 *     s.close(); </pre></blockquote>
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 *
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 * <p>The <a name="default-delimiter">default whitespace delimiter</a> used
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 * by a scanner is as recognized by {@link java.lang.Character}.{@link
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 * java.lang.Character#isWhitespace(char) isWhitespace}. The {@link #reset}
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 * method will reset the value of the scanner's delimiter to the default
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 * whitespace delimiter regardless of whether it was previously changed.
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 *
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 * <p>A scanning operation may block waiting for input.
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 *
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 * <p>The {@link #next} and {@link #hasNext} methods and their
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 * primitive-type companion methods (such as {@link #nextInt} and
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 * {@link #hasNextInt}) first skip any input that matches the delimiter
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 * pattern, and then attempt to return the next token. Both <tt>hasNext</tt>
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 * and <tt>next</tt> methods may block waiting for further input.  Whether a
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 * <tt>hasNext</tt> method blocks has no connection to whether or not its
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 * associated <tt>next</tt> method will block.
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 *
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 * <p> The {@link #findInLine}, {@link #findWithinHorizon}, and {@link #skip}
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 * methods operate independently of the delimiter pattern. These methods will
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 * attempt to match the specified pattern with no regard to delimiters in the
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 * input and thus can be used in special circumstances where delimiters are
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 * not relevant. These methods may block waiting for more input.
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 *
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 * <p>When a scanner throws an {@link InputMismatchException}, the scanner
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 * will not pass the token that caused the exception, so that it may be
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 * retrieved or skipped via some other method.
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 *
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 * <p>Depending upon the type of delimiting pattern, empty tokens may be
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 * returned. For example, the pattern <tt>"\\s+"</tt> will return no empty
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 * tokens since it matches multiple instances of the delimiter. The delimiting
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 * pattern <tt>"\\s"</tt> could return empty tokens since it only passes one
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 * space at a time.
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 *
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 * <p> A scanner can read text from any object which implements the {@link
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 * java.lang.Readable} interface.  If an invocation of the underlying
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 * readable's {@link java.lang.Readable#read} method throws an {@link
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 * java.io.IOException} then the scanner assumes that the end of the input
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 * has been reached.  The most recent <tt>IOException</tt> thrown by the
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 * underlying readable can be retrieved via the {@link #ioException} method.
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 *
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 * <p>When a <code>Scanner</code> is closed, it will close its input source
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 * if the source implements the {@link java.io.Closeable} interface.
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 *
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 * <p>A <code>Scanner</code> is not safe for multithreaded use without
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 * external synchronization.
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 *
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 * <p>Unless otherwise mentioned, passing a <code>null</code> parameter into
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 * any method of a <code>Scanner</code> will cause a
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 * <code>NullPointerException</code> to be thrown.
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 *
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 * <p>A scanner will default to interpreting numbers as decimal unless a
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 * different radix has been set by using the {@link #useRadix} method. The
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 * {@link #reset} method will reset the value of the scanner's radix to
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 * <code>10</code> regardless of whether it was previously changed.
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 *
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 * <a name="localized-numbers">
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 * <h4> Localized numbers </h4>
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 *
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 * <p> An instance of this class is capable of scanning numbers in the standard
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 * formats as well as in the formats of the scanner's locale. A scanner's
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 * <a name="initial-locale">initial locale </a>is the value returned by the {@link
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 * java.util.Locale#getDefault} method; it may be changed via the {@link
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 * #useLocale} method. The {@link #reset} method will reset the value of the
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 * scanner's locale to the initial locale regardless of whether it was
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 * previously changed.
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 *
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 * <p>The localized formats are defined in terms of the following parameters,
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 * which for a particular locale are taken from that locale's {@link
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 * java.text.DecimalFormat DecimalFormat} object, <tt>df</tt>, and its and
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 * {@link java.text.DecimalFormatSymbols DecimalFormatSymbols} object,
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 * <tt>dfs</tt>.
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 *
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 * <blockquote><table>
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 * <tr><td valign="top"><i>LocalGroupSeparator&nbsp;&nbsp;</i></td>
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 *     <td valign="top">The character used to separate thousands groups,
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 *                      <i>i.e.,</i>&nbsp;<tt>dfs.</tt>{@link
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 *                      java.text.DecimalFormatSymbols#getGroupingSeparator
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 *                      getGroupingSeparator()}</td></tr>
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 * <tr><td valign="top"><i>LocalDecimalSeparator&nbsp;&nbsp;</i></td>
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 *     <td valign="top">The character used for the decimal point,
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 *                      <i>i.e.,</i>&nbsp;<tt>dfs.</tt>{@link
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 *                      java.text.DecimalFormatSymbols#getDecimalSeparator
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 *                      getDecimalSeparator()}</td></tr>
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 * <tr><td valign="top"><i>LocalPositivePrefix&nbsp;&nbsp;</i></td>
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 *     <td valign="top">The string that appears before a positive number (may
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 *                      be empty), <i>i.e.,</i>&nbsp;<tt>df.</tt>{@link
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 *                      java.text.DecimalFormat#getPositivePrefix
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 *                      getPositivePrefix()}</td></tr>
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 * <tr><td valign="top"><i>LocalPositiveSuffix&nbsp;&nbsp;</i></td>
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 *     <td valign="top">The string that appears after a positive number (may be
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 *                      empty), <i>i.e.,</i>&nbsp;<tt>df.</tt>{@link
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 *                      java.text.DecimalFormat#getPositiveSuffix
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 *                      getPositiveSuffix()}</td></tr>
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 * <tr><td valign="top"><i>LocalNegativePrefix&nbsp;&nbsp;</i></td>
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 *     <td valign="top">The string that appears before a negative number (may
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 *                      be empty), <i>i.e.,</i>&nbsp;<tt>df.</tt>{@link
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 *                      java.text.DecimalFormat#getNegativePrefix
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 *                      getNegativePrefix()}</td></tr>
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 * <tr><td valign="top"><i>LocalNegativeSuffix&nbsp;&nbsp;</i></td>
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 *     <td valign="top">The string that appears after a negative number (may be
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 *                      empty), <i>i.e.,</i>&nbsp;<tt>df.</tt>{@link
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 *                      java.text.DecimalFormat#getNegativeSuffix
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 *                      getNegativeSuffix()}</td></tr>
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 * <tr><td valign="top"><i>LocalNaN&nbsp;&nbsp;</i></td>
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 *     <td valign="top">The string that represents not-a-number for
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 *                      floating-point values,
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 *                      <i>i.e.,</i>&nbsp;<tt>dfs.</tt>{@link
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 *                      java.text.DecimalFormatSymbols#getNaN
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 *                      getNaN()}</td></tr>
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 * <tr><td valign="top"><i>LocalInfinity&nbsp;&nbsp;</i></td>
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 *     <td valign="top">The string that represents infinity for floating-point
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 *                      values, <i>i.e.,</i>&nbsp;<tt>dfs.</tt>{@link
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 *                      java.text.DecimalFormatSymbols#getInfinity
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 *                      getInfinity()}</td></tr>
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 * </table></blockquote>
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 *
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 * <a name="number-syntax">
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 * <h4> Number syntax </h4>
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 *
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 * <p> The strings that can be parsed as numbers by an instance of this class
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 * are specified in terms of the following regular-expression grammar, where
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 * Rmax is the highest digit in the radix being used (for example, Rmax is 9
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 * in base 10).
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 *
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 * <p>
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 * <table cellspacing=0 cellpadding=0 align=center>
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 *
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 *   <tr><td valign=top align=right><i>NonASCIIDigit</i>&nbsp;&nbsp;::</td>
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 *       <td valign=top>= A non-ASCII character c for which
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 *            {@link java.lang.Character#isDigit Character.isDigit}<tt>(c)</tt>
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 *                        returns&nbsp;true</td></tr>
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 *
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 *   <tr><td>&nbsp;</td></tr>
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 *
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 *   <tr><td align=right><i>Non0Digit</i>&nbsp;&nbsp;::</td>
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 *   <td><tt>= [1-</tt><i>Rmax</i><tt>] | </tt><i>NonASCIIDigit</i></td></tr>
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 *
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 *   <tr><td>&nbsp;</td></tr>
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 *
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 *   <tr><td align=right><i>Digit</i>&nbsp;&nbsp;::</td>
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 *   <td><tt>= [0-</tt><i>Rmax</i><tt>] | </tt><i>NonASCIIDigit</i></td></tr>
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 *
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 *   <tr><td>&nbsp;</td></tr>
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 *
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 *   <tr><td valign=top align=right><i>GroupedNumeral</i>&nbsp;&nbsp;::</td>
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 *       <td valign=top>
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 *         <table cellpadding=0 cellspacing=0>
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 *           <tr><td><tt>= (&nbsp;</tt></td>
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 *               <td><i>Non0Digit</i><tt>
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 *                   </tt><i>Digit</i><tt>?
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 *                   </tt><i>Digit</i><tt>?</tt></td></tr>
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 *           <tr><td></td>
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 *               <td><tt>(&nbsp;</tt><i>LocalGroupSeparator</i><tt>
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 *                         </tt><i>Digit</i><tt>
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 *                         </tt><i>Digit</i><tt>
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 *                         </tt><i>Digit</i><tt> )+ )</tt></td></tr>
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 *         </table></td></tr>
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 *
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 *   <tr><td>&nbsp;</td></tr>
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 *
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 *   <tr><td align=right><i>Numeral</i>&nbsp;&nbsp;::</td>
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 *       <td><tt>= ( ( </tt><i>Digit</i><tt>+ )
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 *               | </tt><i>GroupedNumeral</i><tt> )</tt></td></tr>
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 *
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 *   <tr><td>&nbsp;</td></tr>
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 *
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 *   <tr><td valign=top align=right>
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 *         <a name="Integer-regex"><i>Integer</i>&nbsp;&nbsp;::</td>
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 *       <td valign=top><tt>= ( [-+]? ( </tt><i>Numeral</i><tt>
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 *                               ) )</tt></td></tr>
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 *   <tr><td></td>
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 *       <td><tt>| </tt><i>LocalPositivePrefix</i><tt> </tt><i>Numeral</i><tt>
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 *                      </tt><i>LocalPositiveSuffix</i></td></tr>
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 *   <tr><td></td>
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 *       <td><tt>| </tt><i>LocalNegativePrefix</i><tt> </tt><i>Numeral</i><tt>
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 *                 </tt><i>LocalNegativeSuffix</i></td></tr>
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 *
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 *   <tr><td>&nbsp;</td></tr>
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 *
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 *   <tr><td align=right><i>DecimalNumeral</i>&nbsp;&nbsp;::</td>
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 *       <td><tt>= </tt><i>Numeral</i></td></tr>
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 *   <tr><td></td>
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 *       <td><tt>| </tt><i>Numeral</i><tt>
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 *                 </tt><i>LocalDecimalSeparator</i><tt>
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 *                 </tt><i>Digit</i><tt>*</tt></td></tr>
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 *   <tr><td></td>
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 *       <td><tt>| </tt><i>LocalDecimalSeparator</i><tt>
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 *                 </tt><i>Digit</i><tt>+</tt></td></tr>
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 *
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 *   <tr><td>&nbsp;</td></tr>
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 *
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 *   <tr><td align=right><i>Exponent</i>&nbsp;&nbsp;::</td>
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 *       <td><tt>= ( [eE] [+-]? </tt><i>Digit</i><tt>+ )</tt></td></tr>
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 *
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 *   <tr><td>&nbsp;</td></tr>
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 *
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 *   <tr><td align=right>
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 *         <a name="Decimal-regex"><i>Decimal</i>&nbsp;&nbsp;::</td>
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 *       <td><tt>= ( [-+]? </tt><i>DecimalNumeral</i><tt>
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 *                         </tt><i>Exponent</i><tt>? )</tt></td></tr>
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 *   <tr><td></td>
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 *       <td><tt>| </tt><i>LocalPositivePrefix</i><tt>
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 *                 </tt><i>DecimalNumeral</i><tt>
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 *                 </tt><i>LocalPositiveSuffix</i>
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 *                 </tt><i>Exponent</i><tt>?</td></tr>
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 *   <tr><td></td>
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 *       <td><tt>| </tt><i>LocalNegativePrefix</i><tt>
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 *                 </tt><i>DecimalNumeral</i><tt>
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 *                 </tt><i>LocalNegativeSuffix</i>
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 *                 </tt><i>Exponent</i><tt>?</td></tr>
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 *
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 *   <tr><td>&nbsp;</td></tr>
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 *
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 *   <tr><td align=right><i>HexFloat</i>&nbsp;&nbsp;::</td>
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 *       <td><tt>= [-+]? 0[xX][0-9a-fA-F]*\.[0-9a-fA-F]+
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 *                 ([pP][-+]?[0-9]+)?</tt></td></tr>
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 *
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 *   <tr><td>&nbsp;</td></tr>
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 *
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 *   <tr><td align=right><i>NonNumber</i>&nbsp;&nbsp;::</td>
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 *       <td valign=top><tt>= NaN
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 *                          | </tt><i>LocalNan</i><tt>
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 *                          | Infinity
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 *                          | </tt><i>LocalInfinity</i></td></tr>
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 *
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 *   <tr><td>&nbsp;</td></tr>
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 *
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 *   <tr><td align=right><i>SignedNonNumber</i>&nbsp;&nbsp;::</td>
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 *       <td><tt>= ( [-+]? </tt><i>NonNumber</i><tt> )</tt></td></tr>
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 *   <tr><td></td>
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 *       <td><tt>| </tt><i>LocalPositivePrefix</i><tt>
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 *                 </tt><i>NonNumber</i><tt>
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 *                 </tt><i>LocalPositiveSuffix</i></td></tr>
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 *   <tr><td></td>
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 *       <td><tt>| </tt><i>LocalNegativePrefix</i><tt>
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 *                 </tt><i>NonNumber</i><tt>
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 *                 </tt><i>LocalNegativeSuffix</i></td></tr>
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 *
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 *   <tr><td>&nbsp;</td></tr>
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 *
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 *   <tr><td valign=top align=right>
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 *         <a name="Float-regex"><i>Float</i>&nbsp;&nbsp;::</td>
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 *       <td valign=top><tt>= </tt><i>Decimal</i><tt></td></tr>
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 *       <tr><td></td>
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 *           <td><tt>| </tt><i>HexFloat</i><tt></td></tr>
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 *       <tr><td></td>
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 *           <td><tt>| </tt><i>SignedNonNumber</i><tt></td></tr>
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 *
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 * </table>
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 * </center>
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 *
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 * <p> Whitespace is not significant in the above regular expressions.
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 *
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 * @since   1.5
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 */
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public final class Scanner implements Iterator<String> {
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    // Internal buffer used to hold input
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    private CharBuffer buf;
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    // Size of internal character buffer
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    private static final int BUFFER_SIZE = 1024; // change to 1024;
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    // The index into the buffer currently held by the Scanner
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    private int position;
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    // Internal matcher used for finding delimiters
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    private Matcher matcher;
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    // Pattern used to delimit tokens
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    private Pattern delimPattern;
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    // Pattern found in last hasNext operation
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    private Pattern hasNextPattern;
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    // Position after last hasNext operation
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    private int hasNextPosition;
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    // Result after last hasNext operation
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    private String hasNextResult;
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    // The input source
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    private Readable source;
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    // Boolean is true if source is done
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    private boolean sourceClosed = false;
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    // Boolean indicating more input is required
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    private boolean needInput = false;
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   380
90ce3da70b43 Initial load
duke
parents:
diff changeset
   381
    // Boolean indicating if a delim has been skipped this operation
90ce3da70b43 Initial load
duke
parents:
diff changeset
   382
    private boolean skipped = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   383
90ce3da70b43 Initial load
duke
parents:
diff changeset
   384
    // A store of a position that the scanner may fall back to
90ce3da70b43 Initial load
duke
parents:
diff changeset
   385
    private int savedScannerPosition = -1;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   386
90ce3da70b43 Initial load
duke
parents:
diff changeset
   387
    // A cache of the last primitive type scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   388
    private Object typeCache = null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   389
90ce3da70b43 Initial load
duke
parents:
diff changeset
   390
    // Boolean indicating if a match result is available
90ce3da70b43 Initial load
duke
parents:
diff changeset
   391
    private boolean matchValid = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   392
90ce3da70b43 Initial load
duke
parents:
diff changeset
   393
    // Boolean indicating if this scanner has been closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
   394
    private boolean closed = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   395
90ce3da70b43 Initial load
duke
parents:
diff changeset
   396
    // The current radix used by this scanner
90ce3da70b43 Initial load
duke
parents:
diff changeset
   397
    private int radix = 10;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   398
90ce3da70b43 Initial load
duke
parents:
diff changeset
   399
    // The default radix for this scanner
90ce3da70b43 Initial load
duke
parents:
diff changeset
   400
    private int defaultRadix = 10;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   401
90ce3da70b43 Initial load
duke
parents:
diff changeset
   402
    // The locale used by this scanner
90ce3da70b43 Initial load
duke
parents:
diff changeset
   403
    private Locale locale = null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   404
90ce3da70b43 Initial load
duke
parents:
diff changeset
   405
    // A cache of the last few recently used Patterns
90ce3da70b43 Initial load
duke
parents:
diff changeset
   406
    private LRUCache<String,Pattern> patternCache =
90ce3da70b43 Initial load
duke
parents:
diff changeset
   407
    new LRUCache<String,Pattern>(7) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   408
        protected Pattern create(String s) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   409
            return Pattern.compile(s);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   410
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   411
        protected boolean hasName(Pattern p, String s) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   412
            return p.pattern().equals(s);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   413
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   414
    };
90ce3da70b43 Initial load
duke
parents:
diff changeset
   415
90ce3da70b43 Initial load
duke
parents:
diff changeset
   416
    // A holder of the last IOException encountered
90ce3da70b43 Initial load
duke
parents:
diff changeset
   417
    private IOException lastException;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   418
90ce3da70b43 Initial load
duke
parents:
diff changeset
   419
    // A pattern for java whitespace
90ce3da70b43 Initial load
duke
parents:
diff changeset
   420
    private static Pattern WHITESPACE_PATTERN = Pattern.compile(
90ce3da70b43 Initial load
duke
parents:
diff changeset
   421
                                                "\\p{javaWhitespace}+");
90ce3da70b43 Initial load
duke
parents:
diff changeset
   422
90ce3da70b43 Initial load
duke
parents:
diff changeset
   423
    // A pattern for any token
90ce3da70b43 Initial load
duke
parents:
diff changeset
   424
    private static Pattern FIND_ANY_PATTERN = Pattern.compile("(?s).*");
90ce3da70b43 Initial load
duke
parents:
diff changeset
   425
90ce3da70b43 Initial load
duke
parents:
diff changeset
   426
    // A pattern for non-ASCII digits
90ce3da70b43 Initial load
duke
parents:
diff changeset
   427
    private static Pattern NON_ASCII_DIGIT = Pattern.compile(
90ce3da70b43 Initial load
duke
parents:
diff changeset
   428
        "[\\p{javaDigit}&&[^0-9]]");
90ce3da70b43 Initial load
duke
parents:
diff changeset
   429
90ce3da70b43 Initial load
duke
parents:
diff changeset
   430
    // Fields and methods to support scanning primitive types
90ce3da70b43 Initial load
duke
parents:
diff changeset
   431
90ce3da70b43 Initial load
duke
parents:
diff changeset
   432
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
   433
     * Locale dependent values used to scan numbers
90ce3da70b43 Initial load
duke
parents:
diff changeset
   434
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
   435
    private String groupSeparator = "\\,";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   436
    private String decimalSeparator = "\\.";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   437
    private String nanString = "NaN";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   438
    private String infinityString = "Infinity";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   439
    private String positivePrefix = "";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   440
    private String negativePrefix = "\\-";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   441
    private String positiveSuffix = "";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   442
    private String negativeSuffix = "";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   443
90ce3da70b43 Initial load
duke
parents:
diff changeset
   444
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
   445
     * Fields and an accessor method to match booleans
90ce3da70b43 Initial load
duke
parents:
diff changeset
   446
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
   447
    private static volatile Pattern boolPattern;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   448
    private static final String BOOLEAN_PATTERN = "true|false";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   449
    private static Pattern boolPattern() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   450
        Pattern bp = boolPattern;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   451
        if (bp == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
   452
            boolPattern = bp = Pattern.compile(BOOLEAN_PATTERN,
90ce3da70b43 Initial load
duke
parents:
diff changeset
   453
                                          Pattern.CASE_INSENSITIVE);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   454
        return bp;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   455
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   456
90ce3da70b43 Initial load
duke
parents:
diff changeset
   457
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
   458
     * Fields and methods to match bytes, shorts, ints, and longs
90ce3da70b43 Initial load
duke
parents:
diff changeset
   459
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
   460
    private Pattern integerPattern;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   461
    private String digits = "0123456789abcdefghijklmnopqrstuvwxyz";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   462
    private String non0Digit = "[\\p{javaDigit}&&[^0]]";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   463
    private int SIMPLE_GROUP_INDEX = 5;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   464
    private String buildIntegerPatternString() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   465
        String radixDigits = digits.substring(0, radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   466
        // \\p{javaDigit} is not guaranteed to be appropriate
90ce3da70b43 Initial load
duke
parents:
diff changeset
   467
        // here but what can we do? The final authority will be
90ce3da70b43 Initial load
duke
parents:
diff changeset
   468
        // whatever parse method is invoked, so ultimately the
90ce3da70b43 Initial load
duke
parents:
diff changeset
   469
        // Scanner will do the right thing
90ce3da70b43 Initial load
duke
parents:
diff changeset
   470
        String digit = "((?i)["+radixDigits+"]|\\p{javaDigit})";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   471
        String groupedNumeral = "("+non0Digit+digit+"?"+digit+"?("+
90ce3da70b43 Initial load
duke
parents:
diff changeset
   472
                                groupSeparator+digit+digit+digit+")+)";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   473
        // digit++ is the possessive form which is necessary for reducing
90ce3da70b43 Initial load
duke
parents:
diff changeset
   474
        // backtracking that would otherwise cause unacceptable performance
90ce3da70b43 Initial load
duke
parents:
diff changeset
   475
        String numeral = "(("+ digit+"++)|"+groupedNumeral+")";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   476
        String javaStyleInteger = "([-+]?(" + numeral + "))";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   477
        String negativeInteger = negativePrefix + numeral + negativeSuffix;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   478
        String positiveInteger = positivePrefix + numeral + positiveSuffix;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   479
        return "("+ javaStyleInteger + ")|(" +
90ce3da70b43 Initial load
duke
parents:
diff changeset
   480
            positiveInteger + ")|(" +
90ce3da70b43 Initial load
duke
parents:
diff changeset
   481
            negativeInteger + ")";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   482
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   483
    private Pattern integerPattern() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   484
        if (integerPattern == null) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   485
            integerPattern = patternCache.forName(buildIntegerPatternString());
90ce3da70b43 Initial load
duke
parents:
diff changeset
   486
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   487
        return integerPattern;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   488
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   489
90ce3da70b43 Initial load
duke
parents:
diff changeset
   490
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
   491
     * Fields and an accessor method to match line separators
90ce3da70b43 Initial load
duke
parents:
diff changeset
   492
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
   493
    private static volatile Pattern separatorPattern;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   494
    private static volatile Pattern linePattern;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   495
    private static final String LINE_SEPARATOR_PATTERN =
90ce3da70b43 Initial load
duke
parents:
diff changeset
   496
                                           "\r\n|[\n\r\u2028\u2029\u0085]";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   497
    private static final String LINE_PATTERN = ".*("+LINE_SEPARATOR_PATTERN+")|.+$";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   498
90ce3da70b43 Initial load
duke
parents:
diff changeset
   499
    private static Pattern separatorPattern() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   500
        Pattern sp = separatorPattern;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   501
        if (sp == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
   502
            separatorPattern = sp = Pattern.compile(LINE_SEPARATOR_PATTERN);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   503
        return sp;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   504
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   505
90ce3da70b43 Initial load
duke
parents:
diff changeset
   506
    private static Pattern linePattern() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   507
        Pattern lp = linePattern;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   508
        if (lp == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
   509
            linePattern = lp = Pattern.compile(LINE_PATTERN);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   510
        return lp;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   511
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   512
90ce3da70b43 Initial load
duke
parents:
diff changeset
   513
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
   514
     * Fields and methods to match floats and doubles
90ce3da70b43 Initial load
duke
parents:
diff changeset
   515
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
   516
    private Pattern floatPattern;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   517
    private Pattern decimalPattern;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   518
    private void buildFloatAndDecimalPattern() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   519
        // \\p{javaDigit} may not be perfect, see above
90ce3da70b43 Initial load
duke
parents:
diff changeset
   520
        String digit = "([0-9]|(\\p{javaDigit}))";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   521
        String exponent = "([eE][+-]?"+digit+"+)?";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   522
        String groupedNumeral = "("+non0Digit+digit+"?"+digit+"?("+
90ce3da70b43 Initial load
duke
parents:
diff changeset
   523
                                groupSeparator+digit+digit+digit+")+)";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   524
        // Once again digit++ is used for performance, as above
90ce3da70b43 Initial load
duke
parents:
diff changeset
   525
        String numeral = "(("+digit+"++)|"+groupedNumeral+")";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   526
        String decimalNumeral = "("+numeral+"|"+numeral +
90ce3da70b43 Initial load
duke
parents:
diff changeset
   527
            decimalSeparator + digit + "*+|"+ decimalSeparator +
90ce3da70b43 Initial load
duke
parents:
diff changeset
   528
            digit + "++)";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   529
        String nonNumber = "(NaN|"+nanString+"|Infinity|"+
90ce3da70b43 Initial load
duke
parents:
diff changeset
   530
                               infinityString+")";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   531
        String positiveFloat = "(" + positivePrefix + decimalNumeral +
90ce3da70b43 Initial load
duke
parents:
diff changeset
   532
                            positiveSuffix + exponent + ")";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   533
        String negativeFloat = "(" + negativePrefix + decimalNumeral +
90ce3da70b43 Initial load
duke
parents:
diff changeset
   534
                            negativeSuffix + exponent + ")";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   535
        String decimal = "(([-+]?" + decimalNumeral + exponent + ")|"+
90ce3da70b43 Initial load
duke
parents:
diff changeset
   536
            positiveFloat + "|" + negativeFloat + ")";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   537
        String hexFloat =
90ce3da70b43 Initial load
duke
parents:
diff changeset
   538
            "[-+]?0[xX][0-9a-fA-F]*\\.[0-9a-fA-F]+([pP][-+]?[0-9]+)?";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   539
        String positiveNonNumber = "(" + positivePrefix + nonNumber +
90ce3da70b43 Initial load
duke
parents:
diff changeset
   540
                            positiveSuffix + ")";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   541
        String negativeNonNumber = "(" + negativePrefix + nonNumber +
90ce3da70b43 Initial load
duke
parents:
diff changeset
   542
                            negativeSuffix + ")";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   543
        String signedNonNumber = "(([-+]?"+nonNumber+")|" +
90ce3da70b43 Initial load
duke
parents:
diff changeset
   544
                                 positiveNonNumber + "|" +
90ce3da70b43 Initial load
duke
parents:
diff changeset
   545
                                 negativeNonNumber + ")";
90ce3da70b43 Initial load
duke
parents:
diff changeset
   546
        floatPattern = Pattern.compile(decimal + "|" + hexFloat + "|" +
90ce3da70b43 Initial load
duke
parents:
diff changeset
   547
                                       signedNonNumber);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   548
        decimalPattern = Pattern.compile(decimal);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   549
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   550
    private Pattern floatPattern() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   551
        if (floatPattern == null) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   552
            buildFloatAndDecimalPattern();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   553
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   554
        return floatPattern;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   555
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   556
    private Pattern decimalPattern() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   557
        if (decimalPattern == null) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   558
            buildFloatAndDecimalPattern();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   559
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   560
        return decimalPattern;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   561
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   562
90ce3da70b43 Initial load
duke
parents:
diff changeset
   563
    // Constructors
90ce3da70b43 Initial load
duke
parents:
diff changeset
   564
90ce3da70b43 Initial load
duke
parents:
diff changeset
   565
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
   566
     * Constructs a <code>Scanner</code> that returns values scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   567
     * from the specified source delimited by the specified pattern.
90ce3da70b43 Initial load
duke
parents:
diff changeset
   568
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
   569
     * @param  source A character source implementing the Readable interface
90ce3da70b43 Initial load
duke
parents:
diff changeset
   570
     * @param pattern A delimiting pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
   571
     * @return A scanner with the specified source and pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
   572
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
   573
    private Scanner(Readable source, Pattern pattern) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   574
        if (source == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
   575
            throw new NullPointerException("source");
90ce3da70b43 Initial load
duke
parents:
diff changeset
   576
        if (pattern == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
   577
            throw new NullPointerException("pattern");
90ce3da70b43 Initial load
duke
parents:
diff changeset
   578
        this.source = source;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   579
        delimPattern = pattern;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   580
        buf = CharBuffer.allocate(BUFFER_SIZE);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   581
        buf.limit(0);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   582
        matcher = delimPattern.matcher(buf);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   583
        matcher.useTransparentBounds(true);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   584
        matcher.useAnchoringBounds(false);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   585
        useLocale(Locale.getDefault());
90ce3da70b43 Initial load
duke
parents:
diff changeset
   586
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   587
90ce3da70b43 Initial load
duke
parents:
diff changeset
   588
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
   589
     * Constructs a new <code>Scanner</code> that produces values scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   590
     * from the specified source.
90ce3da70b43 Initial load
duke
parents:
diff changeset
   591
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
   592
     * @param  source A character source implementing the {@link Readable}
90ce3da70b43 Initial load
duke
parents:
diff changeset
   593
     *         interface
90ce3da70b43 Initial load
duke
parents:
diff changeset
   594
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
   595
    public Scanner(Readable source) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   596
        this(source, WHITESPACE_PATTERN);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   597
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   598
90ce3da70b43 Initial load
duke
parents:
diff changeset
   599
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
   600
     * Constructs a new <code>Scanner</code> that produces values scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   601
     * from the specified input stream. Bytes from the stream are converted
90ce3da70b43 Initial load
duke
parents:
diff changeset
   602
     * into characters using the underlying platform's
90ce3da70b43 Initial load
duke
parents:
diff changeset
   603
     * {@linkplain java.nio.charset.Charset#defaultCharset() default charset}.
90ce3da70b43 Initial load
duke
parents:
diff changeset
   604
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
   605
     * @param  source An input stream to be scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   606
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
   607
    public Scanner(InputStream source) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   608
        this(new InputStreamReader(source), WHITESPACE_PATTERN);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   609
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   610
90ce3da70b43 Initial load
duke
parents:
diff changeset
   611
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
   612
     * Constructs a new <code>Scanner</code> that produces values scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   613
     * from the specified input stream. Bytes from the stream are converted
90ce3da70b43 Initial load
duke
parents:
diff changeset
   614
     * into characters using the specified charset.
90ce3da70b43 Initial load
duke
parents:
diff changeset
   615
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
   616
     * @param  source An input stream to be scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   617
     * @param charsetName The encoding type used to convert bytes from the
90ce3da70b43 Initial load
duke
parents:
diff changeset
   618
     *        stream into characters to be scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   619
     * @throws IllegalArgumentException if the specified character set
90ce3da70b43 Initial load
duke
parents:
diff changeset
   620
     *         does not exist
90ce3da70b43 Initial load
duke
parents:
diff changeset
   621
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
   622
    public Scanner(InputStream source, String charsetName) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   623
        this(makeReadable(source, charsetName), WHITESPACE_PATTERN);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   624
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   625
90ce3da70b43 Initial load
duke
parents:
diff changeset
   626
    private static Readable makeReadable(InputStream source,
90ce3da70b43 Initial load
duke
parents:
diff changeset
   627
                                         String charsetName)
90ce3da70b43 Initial load
duke
parents:
diff changeset
   628
    {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   629
        if (source == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
   630
            throw new NullPointerException("source");
90ce3da70b43 Initial load
duke
parents:
diff changeset
   631
        InputStreamReader isr = null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   632
        try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   633
            isr = new InputStreamReader(source, charsetName);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   634
        } catch (UnsupportedEncodingException uee) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   635
            IllegalArgumentException iae = new IllegalArgumentException();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   636
            iae.initCause(uee);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   637
            throw iae;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   638
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   639
        return isr;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   640
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   641
90ce3da70b43 Initial load
duke
parents:
diff changeset
   642
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
   643
     * Constructs a new <code>Scanner</code> that produces values scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   644
     * from the specified file. Bytes from the file are converted into
90ce3da70b43 Initial load
duke
parents:
diff changeset
   645
     * characters using the underlying platform's
90ce3da70b43 Initial load
duke
parents:
diff changeset
   646
     * {@linkplain java.nio.charset.Charset#defaultCharset() default charset}.
90ce3da70b43 Initial load
duke
parents:
diff changeset
   647
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
   648
     * @param  source A file to be scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   649
     * @throws FileNotFoundException if source is not found
90ce3da70b43 Initial load
duke
parents:
diff changeset
   650
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
   651
    public Scanner(File source)
90ce3da70b43 Initial load
duke
parents:
diff changeset
   652
        throws FileNotFoundException
90ce3da70b43 Initial load
duke
parents:
diff changeset
   653
    {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   654
        this((ReadableByteChannel)(new FileInputStream(source).getChannel()));
90ce3da70b43 Initial load
duke
parents:
diff changeset
   655
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   656
90ce3da70b43 Initial load
duke
parents:
diff changeset
   657
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
   658
     * Constructs a new <code>Scanner</code> that produces values scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   659
     * from the specified file. Bytes from the file are converted into
90ce3da70b43 Initial load
duke
parents:
diff changeset
   660
     * characters using the specified charset.
90ce3da70b43 Initial load
duke
parents:
diff changeset
   661
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
   662
     * @param  source A file to be scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   663
     * @param charsetName The encoding type used to convert bytes from the file
90ce3da70b43 Initial load
duke
parents:
diff changeset
   664
     *        into characters to be scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   665
     * @throws FileNotFoundException if source is not found
90ce3da70b43 Initial load
duke
parents:
diff changeset
   666
     * @throws IllegalArgumentException if the specified encoding is
90ce3da70b43 Initial load
duke
parents:
diff changeset
   667
     *         not found
90ce3da70b43 Initial load
duke
parents:
diff changeset
   668
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
   669
    public Scanner(File source, String charsetName)
90ce3da70b43 Initial load
duke
parents:
diff changeset
   670
        throws FileNotFoundException
90ce3da70b43 Initial load
duke
parents:
diff changeset
   671
    {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   672
        this((ReadableByteChannel)(new FileInputStream(source).getChannel()),
90ce3da70b43 Initial load
duke
parents:
diff changeset
   673
             charsetName);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   674
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   675
90ce3da70b43 Initial load
duke
parents:
diff changeset
   676
    /**
2057
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   677
     * {@note new}
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   678
     * Constructs a new <code>Scanner</code> that produces values scanned
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   679
     * from the specified file. Bytes from the file are converted into
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   680
     * characters using the underlying platform's
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   681
     * {@linkplain java.nio.charset.Charset#defaultCharset() default charset}.
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   682
     *
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   683
     * @param   source
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   684
     *          A file to be scanned
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   685
     * @throws  IOException
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   686
     *          if an I/O error occurs opening source
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   687
     *
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   688
     * @since   1.7
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   689
     */
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   690
    public Scanner(FileRef source)
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   691
        throws IOException
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   692
    {
3065
452aaa2899fc 6838333: New I/O: Update file system API to jsr203/nio2-b101
alanb
parents: 2057
diff changeset
   693
        this(source.newInputStream());
2057
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   694
    }
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   695
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   696
    /**
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   697
     * {@note new}
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   698
     * Constructs a new <code>Scanner</code> that produces values scanned
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   699
     * from the specified file. Bytes from the file are converted into
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   700
     * characters using the specified charset.
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   701
     *
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   702
     * @param   source
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   703
     *          A file to be scanned
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   704
     * @param   charsetName
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   705
     *          The encoding type used to convert bytes from the file
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   706
     *          into characters to be scanned
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   707
     * @throws  IOException
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   708
     *          if an I/O error occurs opening source
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   709
     * @throws  IllegalArgumentException
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   710
     *          if the specified encoding is not found
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   711
     * @since   1.7
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   712
     */
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   713
    public Scanner(FileRef source, String charsetName)
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   714
        throws IOException
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   715
    {
3065
452aaa2899fc 6838333: New I/O: Update file system API to jsr203/nio2-b101
alanb
parents: 2057
diff changeset
   716
        this(source.newInputStream(), charsetName);
2057
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   717
    }
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   718
3acf8e5e2ca0 6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents: 2
diff changeset
   719
    /**
2
90ce3da70b43 Initial load
duke
parents:
diff changeset
   720
     * Constructs a new <code>Scanner</code> that produces values scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   721
     * from the specified string.
90ce3da70b43 Initial load
duke
parents:
diff changeset
   722
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
   723
     * @param  source A string to scan
90ce3da70b43 Initial load
duke
parents:
diff changeset
   724
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
   725
    public Scanner(String source) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   726
        this(new StringReader(source), WHITESPACE_PATTERN);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   727
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   728
90ce3da70b43 Initial load
duke
parents:
diff changeset
   729
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
   730
     * Constructs a new <code>Scanner</code> that produces values scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   731
     * from the specified channel. Bytes from the source are converted into
90ce3da70b43 Initial load
duke
parents:
diff changeset
   732
     * characters using the underlying platform's
90ce3da70b43 Initial load
duke
parents:
diff changeset
   733
     * {@linkplain java.nio.charset.Charset#defaultCharset() default charset}.
90ce3da70b43 Initial load
duke
parents:
diff changeset
   734
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
   735
     * @param  source A channel to scan
90ce3da70b43 Initial load
duke
parents:
diff changeset
   736
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
   737
    public Scanner(ReadableByteChannel source) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   738
        this(makeReadable(source), WHITESPACE_PATTERN);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   739
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   740
90ce3da70b43 Initial load
duke
parents:
diff changeset
   741
    private static Readable makeReadable(ReadableByteChannel source) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   742
        if (source == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
   743
            throw new NullPointerException("source");
90ce3da70b43 Initial load
duke
parents:
diff changeset
   744
        String defaultCharsetName =
90ce3da70b43 Initial load
duke
parents:
diff changeset
   745
            java.nio.charset.Charset.defaultCharset().name();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   746
        return Channels.newReader(source,
90ce3da70b43 Initial load
duke
parents:
diff changeset
   747
                           java.nio.charset.Charset.defaultCharset().name());
90ce3da70b43 Initial load
duke
parents:
diff changeset
   748
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   749
90ce3da70b43 Initial load
duke
parents:
diff changeset
   750
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
   751
     * Constructs a new <code>Scanner</code> that produces values scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   752
     * from the specified channel. Bytes from the source are converted into
90ce3da70b43 Initial load
duke
parents:
diff changeset
   753
     * characters using the specified charset.
90ce3da70b43 Initial load
duke
parents:
diff changeset
   754
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
   755
     * @param  source A channel to scan
90ce3da70b43 Initial load
duke
parents:
diff changeset
   756
     * @param charsetName The encoding type used to convert bytes from the
90ce3da70b43 Initial load
duke
parents:
diff changeset
   757
     *        channel into characters to be scanned
90ce3da70b43 Initial load
duke
parents:
diff changeset
   758
     * @throws IllegalArgumentException if the specified character set
90ce3da70b43 Initial load
duke
parents:
diff changeset
   759
     *         does not exist
90ce3da70b43 Initial load
duke
parents:
diff changeset
   760
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
   761
    public Scanner(ReadableByteChannel source, String charsetName) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   762
        this(makeReadable(source, charsetName), WHITESPACE_PATTERN);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   763
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   764
90ce3da70b43 Initial load
duke
parents:
diff changeset
   765
    private static Readable makeReadable(ReadableByteChannel source,
90ce3da70b43 Initial load
duke
parents:
diff changeset
   766
                                  String charsetName)
90ce3da70b43 Initial load
duke
parents:
diff changeset
   767
    {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   768
        if (source == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
   769
            throw new NullPointerException("source");
90ce3da70b43 Initial load
duke
parents:
diff changeset
   770
        if (!Charset.isSupported(charsetName))
90ce3da70b43 Initial load
duke
parents:
diff changeset
   771
            throw new IllegalArgumentException(charsetName);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   772
        return Channels.newReader(source, charsetName);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   773
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   774
90ce3da70b43 Initial load
duke
parents:
diff changeset
   775
    // Private primitives used to support scanning
90ce3da70b43 Initial load
duke
parents:
diff changeset
   776
90ce3da70b43 Initial load
duke
parents:
diff changeset
   777
    private void saveState() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   778
        savedScannerPosition = position;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   779
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   780
90ce3da70b43 Initial load
duke
parents:
diff changeset
   781
    private void revertState() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   782
        this.position = savedScannerPosition;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   783
        savedScannerPosition = -1;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   784
        skipped = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   785
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   786
90ce3da70b43 Initial load
duke
parents:
diff changeset
   787
    private boolean revertState(boolean b) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   788
        this.position = savedScannerPosition;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   789
        savedScannerPosition = -1;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   790
        skipped = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   791
        return b;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   792
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   793
90ce3da70b43 Initial load
duke
parents:
diff changeset
   794
    private void cacheResult() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   795
        hasNextResult = matcher.group();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   796
        hasNextPosition = matcher.end();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   797
        hasNextPattern = matcher.pattern();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   798
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   799
90ce3da70b43 Initial load
duke
parents:
diff changeset
   800
    private void cacheResult(String result) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   801
        hasNextResult = result;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   802
        hasNextPosition = matcher.end();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   803
        hasNextPattern = matcher.pattern();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   804
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   805
90ce3da70b43 Initial load
duke
parents:
diff changeset
   806
    // Clears both regular cache and type cache
90ce3da70b43 Initial load
duke
parents:
diff changeset
   807
    private void clearCaches() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   808
        hasNextPattern = null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   809
        typeCache = null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   810
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   811
90ce3da70b43 Initial load
duke
parents:
diff changeset
   812
    // Also clears both the regular cache and the type cache
90ce3da70b43 Initial load
duke
parents:
diff changeset
   813
    private String getCachedResult() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   814
        position = hasNextPosition;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   815
        hasNextPattern = null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   816
        typeCache = null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   817
        return hasNextResult;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   818
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   819
90ce3da70b43 Initial load
duke
parents:
diff changeset
   820
    // Also clears both the regular cache and the type cache
90ce3da70b43 Initial load
duke
parents:
diff changeset
   821
    private void useTypeCache() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   822
        if (closed)
90ce3da70b43 Initial load
duke
parents:
diff changeset
   823
            throw new IllegalStateException("Scanner closed");
90ce3da70b43 Initial load
duke
parents:
diff changeset
   824
        position = hasNextPosition;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   825
        hasNextPattern = null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   826
        typeCache = null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   827
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   828
90ce3da70b43 Initial load
duke
parents:
diff changeset
   829
    // Tries to read more input. May block.
90ce3da70b43 Initial load
duke
parents:
diff changeset
   830
    private void readInput() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   831
        if (buf.limit() == buf.capacity())
90ce3da70b43 Initial load
duke
parents:
diff changeset
   832
            makeSpace();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   833
90ce3da70b43 Initial load
duke
parents:
diff changeset
   834
        // Prepare to receive data
90ce3da70b43 Initial load
duke
parents:
diff changeset
   835
        int p = buf.position();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   836
        buf.position(buf.limit());
90ce3da70b43 Initial load
duke
parents:
diff changeset
   837
        buf.limit(buf.capacity());
90ce3da70b43 Initial load
duke
parents:
diff changeset
   838
90ce3da70b43 Initial load
duke
parents:
diff changeset
   839
        int n = 0;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   840
        try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   841
            n = source.read(buf);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   842
        } catch (IOException ioe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   843
            lastException = ioe;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   844
            n = -1;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   845
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   846
90ce3da70b43 Initial load
duke
parents:
diff changeset
   847
        if (n == -1) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   848
            sourceClosed = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   849
            needInput = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   850
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   851
90ce3da70b43 Initial load
duke
parents:
diff changeset
   852
        if (n > 0)
90ce3da70b43 Initial load
duke
parents:
diff changeset
   853
            needInput = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   854
90ce3da70b43 Initial load
duke
parents:
diff changeset
   855
        // Restore current position and limit for reading
90ce3da70b43 Initial load
duke
parents:
diff changeset
   856
        buf.limit(buf.position());
90ce3da70b43 Initial load
duke
parents:
diff changeset
   857
        buf.position(p);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   858
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   859
90ce3da70b43 Initial load
duke
parents:
diff changeset
   860
    // After this method is called there will either be an exception
90ce3da70b43 Initial load
duke
parents:
diff changeset
   861
    // or else there will be space in the buffer
90ce3da70b43 Initial load
duke
parents:
diff changeset
   862
    private boolean makeSpace() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   863
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   864
        int offset = savedScannerPosition == -1 ?
90ce3da70b43 Initial load
duke
parents:
diff changeset
   865
            position : savedScannerPosition;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   866
        buf.position(offset);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   867
        // Gain space by compacting buffer
90ce3da70b43 Initial load
duke
parents:
diff changeset
   868
        if (offset > 0) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   869
            buf.compact();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   870
            translateSavedIndexes(offset);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   871
            position -= offset;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   872
            buf.flip();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   873
            return true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   874
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   875
        // Gain space by growing buffer
90ce3da70b43 Initial load
duke
parents:
diff changeset
   876
        int newSize = buf.capacity() * 2;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   877
        CharBuffer newBuf = CharBuffer.allocate(newSize);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   878
        newBuf.put(buf);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   879
        newBuf.flip();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   880
        translateSavedIndexes(offset);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   881
        position -= offset;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   882
        buf = newBuf;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   883
        matcher.reset(buf);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   884
        return true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   885
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   886
90ce3da70b43 Initial load
duke
parents:
diff changeset
   887
    // When a buffer compaction/reallocation occurs the saved indexes must
90ce3da70b43 Initial load
duke
parents:
diff changeset
   888
    // be modified appropriately
90ce3da70b43 Initial load
duke
parents:
diff changeset
   889
    private void translateSavedIndexes(int offset) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   890
        if (savedScannerPosition != -1)
90ce3da70b43 Initial load
duke
parents:
diff changeset
   891
            savedScannerPosition -= offset;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   892
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   893
90ce3da70b43 Initial load
duke
parents:
diff changeset
   894
    // If we are at the end of input then NoSuchElement;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   895
    // If there is still input left then InputMismatch
90ce3da70b43 Initial load
duke
parents:
diff changeset
   896
    private void throwFor() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   897
        skipped = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   898
        if ((sourceClosed) && (position == buf.limit()))
90ce3da70b43 Initial load
duke
parents:
diff changeset
   899
            throw new NoSuchElementException();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   900
        else
90ce3da70b43 Initial load
duke
parents:
diff changeset
   901
            throw new InputMismatchException();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   902
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   903
90ce3da70b43 Initial load
duke
parents:
diff changeset
   904
    // Returns true if a complete token or partial token is in the buffer.
90ce3da70b43 Initial load
duke
parents:
diff changeset
   905
    // It is not necessary to find a complete token since a partial token
90ce3da70b43 Initial load
duke
parents:
diff changeset
   906
    // means that there will be another token with or without more input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
   907
    private boolean hasTokenInBuffer() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   908
        matchValid = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   909
        matcher.usePattern(delimPattern);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   910
        matcher.region(position, buf.limit());
90ce3da70b43 Initial load
duke
parents:
diff changeset
   911
90ce3da70b43 Initial load
duke
parents:
diff changeset
   912
        // Skip delims first
90ce3da70b43 Initial load
duke
parents:
diff changeset
   913
        if (matcher.lookingAt())
90ce3da70b43 Initial load
duke
parents:
diff changeset
   914
            position = matcher.end();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   915
90ce3da70b43 Initial load
duke
parents:
diff changeset
   916
        // If we are sitting at the end, no more tokens in buffer
90ce3da70b43 Initial load
duke
parents:
diff changeset
   917
        if (position == buf.limit())
90ce3da70b43 Initial load
duke
parents:
diff changeset
   918
            return false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   919
90ce3da70b43 Initial load
duke
parents:
diff changeset
   920
        return true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   921
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   922
90ce3da70b43 Initial load
duke
parents:
diff changeset
   923
    /*
90ce3da70b43 Initial load
duke
parents:
diff changeset
   924
     * Returns a "complete token" that matches the specified pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
   925
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
   926
     * A token is complete if surrounded by delims; a partial token
90ce3da70b43 Initial load
duke
parents:
diff changeset
   927
     * is prefixed by delims but not postfixed by them
90ce3da70b43 Initial load
duke
parents:
diff changeset
   928
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
   929
     * The position is advanced to the end of that complete token
90ce3da70b43 Initial load
duke
parents:
diff changeset
   930
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
   931
     * Pattern == null means accept any token at all
90ce3da70b43 Initial load
duke
parents:
diff changeset
   932
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
   933
     * Triple return:
90ce3da70b43 Initial load
duke
parents:
diff changeset
   934
     * 1. valid string means it was found
90ce3da70b43 Initial load
duke
parents:
diff changeset
   935
     * 2. null with needInput=false means we won't ever find it
90ce3da70b43 Initial load
duke
parents:
diff changeset
   936
     * 3. null with needInput=true means try again after readInput
90ce3da70b43 Initial load
duke
parents:
diff changeset
   937
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
   938
    private String getCompleteTokenInBuffer(Pattern pattern) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   939
        matchValid = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   940
90ce3da70b43 Initial load
duke
parents:
diff changeset
   941
        // Skip delims first
90ce3da70b43 Initial load
duke
parents:
diff changeset
   942
        matcher.usePattern(delimPattern);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   943
        if (!skipped) { // Enforcing only one skip of leading delims
90ce3da70b43 Initial load
duke
parents:
diff changeset
   944
            matcher.region(position, buf.limit());
90ce3da70b43 Initial load
duke
parents:
diff changeset
   945
            if (matcher.lookingAt()) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   946
                // If more input could extend the delimiters then we must wait
90ce3da70b43 Initial load
duke
parents:
diff changeset
   947
                // for more input
90ce3da70b43 Initial load
duke
parents:
diff changeset
   948
                if (matcher.hitEnd() && !sourceClosed) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   949
                    needInput = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   950
                    return null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   951
                }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   952
                // The delims were whole and the matcher should skip them
90ce3da70b43 Initial load
duke
parents:
diff changeset
   953
                skipped = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   954
                position = matcher.end();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   955
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   956
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   957
90ce3da70b43 Initial load
duke
parents:
diff changeset
   958
        // If we are sitting at the end, no more tokens in buffer
90ce3da70b43 Initial load
duke
parents:
diff changeset
   959
        if (position == buf.limit()) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   960
            if (sourceClosed)
90ce3da70b43 Initial load
duke
parents:
diff changeset
   961
                return null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   962
            needInput = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   963
            return null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   964
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   965
90ce3da70b43 Initial load
duke
parents:
diff changeset
   966
        // Must look for next delims. Simply attempting to match the
90ce3da70b43 Initial load
duke
parents:
diff changeset
   967
        // pattern at this point may find a match but it might not be
90ce3da70b43 Initial load
duke
parents:
diff changeset
   968
        // the first longest match because of missing input, or it might
90ce3da70b43 Initial load
duke
parents:
diff changeset
   969
        // match a partial token instead of the whole thing.
90ce3da70b43 Initial load
duke
parents:
diff changeset
   970
90ce3da70b43 Initial load
duke
parents:
diff changeset
   971
        // Then look for next delims
90ce3da70b43 Initial load
duke
parents:
diff changeset
   972
        matcher.region(position, buf.limit());
90ce3da70b43 Initial load
duke
parents:
diff changeset
   973
        boolean foundNextDelim = matcher.find();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   974
        if (foundNextDelim && (matcher.end() == position)) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   975
            // Zero length delimiter match; we should find the next one
90ce3da70b43 Initial load
duke
parents:
diff changeset
   976
            // using the automatic advance past a zero length match;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   977
            // Otherwise we have just found the same one we just skipped
90ce3da70b43 Initial load
duke
parents:
diff changeset
   978
            foundNextDelim = matcher.find();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   979
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   980
        if (foundNextDelim) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   981
            // In the rare case that more input could cause the match
90ce3da70b43 Initial load
duke
parents:
diff changeset
   982
            // to be lost and there is more input coming we must wait
90ce3da70b43 Initial load
duke
parents:
diff changeset
   983
            // for more input. Note that hitting the end is okay as long
90ce3da70b43 Initial load
duke
parents:
diff changeset
   984
            // as the match cannot go away. It is the beginning of the
90ce3da70b43 Initial load
duke
parents:
diff changeset
   985
            // next delims we want to be sure about, we don't care if
90ce3da70b43 Initial load
duke
parents:
diff changeset
   986
            // they potentially extend further.
90ce3da70b43 Initial load
duke
parents:
diff changeset
   987
            if (matcher.requireEnd() && !sourceClosed) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   988
                needInput = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   989
                return null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   990
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   991
            int tokenEnd = matcher.start();
90ce3da70b43 Initial load
duke
parents:
diff changeset
   992
            // There is a complete token.
90ce3da70b43 Initial load
duke
parents:
diff changeset
   993
            if (pattern == null) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
   994
                // Must continue with match to provide valid MatchResult
90ce3da70b43 Initial load
duke
parents:
diff changeset
   995
                pattern = FIND_ANY_PATTERN;
90ce3da70b43 Initial load
duke
parents:
diff changeset
   996
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
   997
            //  Attempt to match against the desired pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
   998
            matcher.usePattern(pattern);
90ce3da70b43 Initial load
duke
parents:
diff changeset
   999
            matcher.region(position, tokenEnd);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1000
            if (matcher.matches()) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1001
                String s = matcher.group();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1002
                position = matcher.end();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1003
                return s;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1004
            } else { // Complete token but it does not match
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1005
                return null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1006
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1007
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1008
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1009
        // If we can't find the next delims but no more input is coming,
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1010
        // then we can treat the remainder as a whole token
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1011
        if (sourceClosed) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1012
            if (pattern == null) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1013
                // Must continue with match to provide valid MatchResult
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1014
                pattern = FIND_ANY_PATTERN;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1015
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1016
            // Last token; Match the pattern here or throw
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1017
            matcher.usePattern(pattern);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1018
            matcher.region(position, buf.limit());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1019
            if (matcher.matches()) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1020
                String s = matcher.group();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1021
                position = matcher.end();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1022
                return s;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1023
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1024
            // Last piece does not match
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1025
            return null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1026
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1027
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1028
        // There is a partial token in the buffer; must read more
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1029
        // to complete it
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1030
        needInput = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1031
        return null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1032
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1033
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1034
    // Finds the specified pattern in the buffer up to horizon.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1035
    // Returns a match for the specified input pattern.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1036
    private String findPatternInBuffer(Pattern pattern, int horizon) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1037
        matchValid = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1038
        matcher.usePattern(pattern);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1039
        int bufferLimit = buf.limit();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1040
        int horizonLimit = -1;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1041
        int searchLimit = bufferLimit;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1042
        if (horizon > 0) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1043
            horizonLimit = position + horizon;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1044
            if (horizonLimit < bufferLimit)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1045
                searchLimit = horizonLimit;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1046
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1047
        matcher.region(position, searchLimit);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1048
        if (matcher.find()) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1049
            if (matcher.hitEnd() && (!sourceClosed)) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1050
                // The match may be longer if didn't hit horizon or real end
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1051
                if (searchLimit != horizonLimit) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1052
                     // Hit an artificial end; try to extend the match
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1053
                    needInput = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1054
                    return null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1055
                }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1056
                // The match could go away depending on what is next
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1057
                if ((searchLimit == horizonLimit) && matcher.requireEnd()) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1058
                    // Rare case: we hit the end of input and it happens
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1059
                    // that it is at the horizon and the end of input is
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1060
                    // required for the match.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1061
                    needInput = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1062
                    return null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1063
                }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1064
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1065
            // Did not hit end, or hit real end, or hit horizon
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1066
            position = matcher.end();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1067
            return matcher.group();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1068
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1069
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1070
        if (sourceClosed)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1071
            return null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1072
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1073
        // If there is no specified horizon, or if we have not searched
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1074
        // to the specified horizon yet, get more input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1075
        if ((horizon == 0) || (searchLimit != horizonLimit))
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1076
            needInput = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1077
        return null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1078
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1079
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1080
    // Returns a match for the specified input pattern anchored at
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1081
    // the current position
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1082
    private String matchPatternInBuffer(Pattern pattern) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1083
        matchValid = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1084
        matcher.usePattern(pattern);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1085
        matcher.region(position, buf.limit());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1086
        if (matcher.lookingAt()) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1087
            if (matcher.hitEnd() && (!sourceClosed)) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1088
                // Get more input and try again
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1089
                needInput = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1090
                return null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1091
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1092
            position = matcher.end();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1093
            return matcher.group();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1094
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1095
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1096
        if (sourceClosed)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1097
            return null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1098
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1099
        // Read more to find pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1100
        needInput = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1101
        return null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1102
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1103
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1104
    // Throws if the scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1105
    private void ensureOpen() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1106
        if (closed)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1107
            throw new IllegalStateException("Scanner closed");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1108
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1109
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1110
    // Public methods
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1111
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1112
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1113
     * Closes this scanner.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1114
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1115
     * <p> If this scanner has not yet been closed then if its underlying
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1116
     * {@linkplain java.lang.Readable readable} also implements the {@link
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1117
     * java.io.Closeable} interface then the readable's <tt>close</tt> method
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1118
     * will be invoked.  If this scanner is already closed then invoking this
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1119
     * method will have no effect.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1120
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1121
     * <p>Attempting to perform search operations after a scanner has
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1122
     * been closed will result in an {@link IllegalStateException}.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1123
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1124
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1125
    public void close() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1126
        if (closed)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1127
            return;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1128
        if (source instanceof Closeable) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1129
            try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1130
                ((Closeable)source).close();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1131
            } catch (IOException ioe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1132
                lastException = ioe;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1133
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1134
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1135
        sourceClosed = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1136
        source = null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1137
        closed = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1138
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1139
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1140
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1141
     * Returns the <code>IOException</code> last thrown by this
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1142
     * <code>Scanner</code>'s underlying <code>Readable</code>. This method
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1143
     * returns <code>null</code> if no such exception exists.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1144
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1145
     * @return the last exception thrown by this scanner's readable
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1146
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1147
    public IOException ioException() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1148
        return lastException;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1149
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1150
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1151
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1152
     * Returns the <code>Pattern</code> this <code>Scanner</code> is currently
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1153
     * using to match delimiters.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1154
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1155
     * @return this scanner's delimiting pattern.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1156
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1157
    public Pattern delimiter() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1158
        return delimPattern;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1159
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1160
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1161
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1162
     * Sets this scanner's delimiting pattern to the specified pattern.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1163
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1164
     * @param pattern A delimiting pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1165
     * @return this scanner
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1166
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1167
    public Scanner useDelimiter(Pattern pattern) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1168
        delimPattern = pattern;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1169
        return this;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1170
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1171
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1172
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1173
     * Sets this scanner's delimiting pattern to a pattern constructed from
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1174
     * the specified <code>String</code>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1175
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1176
     * <p> An invocation of this method of the form
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1177
     * <tt>useDelimiter(pattern)</tt> behaves in exactly the same way as the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1178
     * invocation <tt>useDelimiter(Pattern.compile(pattern))</tt>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1179
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1180
     * <p> Invoking the {@link #reset} method will set the scanner's delimiter
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1181
     * to the <a href= "#default-delimiter">default</a>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1182
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1183
     * @param pattern A string specifying a delimiting pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1184
     * @return this scanner
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1185
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1186
    public Scanner useDelimiter(String pattern) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1187
        delimPattern = patternCache.forName(pattern);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1188
        return this;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1189
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1190
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1191
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1192
     * Returns this scanner's locale.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1193
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1194
     * <p>A scanner's locale affects many elements of its default
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1195
     * primitive matching regular expressions; see
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1196
     * <a href= "#localized-numbers">localized numbers</a> above.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1197
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1198
     * @return this scanner's locale
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1199
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1200
    public Locale locale() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1201
        return this.locale;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1202
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1203
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1204
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1205
     * Sets this scanner's locale to the specified locale.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1206
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1207
     * <p>A scanner's locale affects many elements of its default
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1208
     * primitive matching regular expressions; see
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1209
     * <a href= "#localized-numbers">localized numbers</a> above.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1210
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1211
     * <p>Invoking the {@link #reset} method will set the scanner's locale to
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1212
     * the <a href= "#initial-locale">initial locale</a>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1213
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1214
     * @param locale A string specifying the locale to use
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1215
     * @return this scanner
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1216
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1217
    public Scanner useLocale(Locale locale) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1218
        if (locale.equals(this.locale))
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1219
            return this;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1220
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1221
        this.locale = locale;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1222
        DecimalFormat df =
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1223
            (DecimalFormat)NumberFormat.getNumberInstance(locale);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1224
        DecimalFormatSymbols dfs = DecimalFormatSymbols.getInstance(locale);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1225
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1226
        // These must be literalized to avoid collision with regex
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1227
        // metacharacters such as dot or parenthesis
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1228
        groupSeparator =   "\\" + dfs.getGroupingSeparator();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1229
        decimalSeparator = "\\" + dfs.getDecimalSeparator();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1230
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1231
        // Quoting the nonzero length locale-specific things
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1232
        // to avoid potential conflict with metacharacters
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1233
        nanString = "\\Q" + dfs.getNaN() + "\\E";
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1234
        infinityString = "\\Q" + dfs.getInfinity() + "\\E";
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1235
        positivePrefix = df.getPositivePrefix();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1236
        if (positivePrefix.length() > 0)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1237
            positivePrefix = "\\Q" + positivePrefix + "\\E";
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1238
        negativePrefix = df.getNegativePrefix();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1239
        if (negativePrefix.length() > 0)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1240
            negativePrefix = "\\Q" + negativePrefix + "\\E";
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1241
        positiveSuffix = df.getPositiveSuffix();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1242
        if (positiveSuffix.length() > 0)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1243
            positiveSuffix = "\\Q" + positiveSuffix + "\\E";
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1244
        negativeSuffix = df.getNegativeSuffix();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1245
        if (negativeSuffix.length() > 0)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1246
            negativeSuffix = "\\Q" + negativeSuffix + "\\E";
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1247
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1248
        // Force rebuilding and recompilation of locale dependent
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1249
        // primitive patterns
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1250
        integerPattern = null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1251
        floatPattern = null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1252
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1253
        return this;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1254
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1255
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1256
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1257
     * Returns this scanner's default radix.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1258
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1259
     * <p>A scanner's radix affects elements of its default
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1260
     * number matching regular expressions; see
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1261
     * <a href= "#localized-numbers">localized numbers</a> above.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1262
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1263
     * @return the default radix of this scanner
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1264
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1265
    public int radix() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1266
        return this.defaultRadix;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1267
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1268
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1269
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1270
     * Sets this scanner's default radix to the specified radix.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1271
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1272
     * <p>A scanner's radix affects elements of its default
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1273
     * number matching regular expressions; see
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1274
     * <a href= "#localized-numbers">localized numbers</a> above.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1275
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1276
     * <p>If the radix is less than <code>Character.MIN_RADIX</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1277
     * or greater than <code>Character.MAX_RADIX</code>, then an
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1278
     * <code>IllegalArgumentException</code> is thrown.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1279
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1280
     * <p>Invoking the {@link #reset} method will set the scanner's radix to
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1281
     * <code>10</code>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1282
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1283
     * @param radix The radix to use when scanning numbers
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1284
     * @return this scanner
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1285
     * @throws IllegalArgumentException if radix is out of range
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1286
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1287
    public Scanner useRadix(int radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1288
        if ((radix < Character.MIN_RADIX) || (radix > Character.MAX_RADIX))
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1289
            throw new IllegalArgumentException("radix:"+radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1290
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1291
        if (this.defaultRadix == radix)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1292
            return this;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1293
        this.defaultRadix = radix;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1294
        // Force rebuilding and recompilation of radix dependent patterns
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1295
        integerPattern = null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1296
        return this;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1297
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1298
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1299
    // The next operation should occur in the specified radix but
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1300
    // the default is left untouched.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1301
    private void setRadix(int radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1302
        if (this.radix != radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1303
            // Force rebuilding and recompilation of radix dependent patterns
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1304
            integerPattern = null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1305
            this.radix = radix;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1306
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1307
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1308
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1309
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1310
     * Returns the match result of the last scanning operation performed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1311
     * by this scanner. This method throws <code>IllegalStateException</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1312
     * if no match has been performed, or if the last match was
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1313
     * not successful.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1314
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1315
     * <p>The various <code>next</code>methods of <code>Scanner</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1316
     * make a match result available if they complete without throwing an
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1317
     * exception. For instance, after an invocation of the {@link #nextInt}
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1318
     * method that returned an int, this method returns a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1319
     * <code>MatchResult</code> for the search of the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1320
     * <a href="#Integer-regex"><i>Integer</i></a> regular expression
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1321
     * defined above. Similarly the {@link #findInLine},
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1322
     * {@link #findWithinHorizon}, and {@link #skip} methods will make a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1323
     * match available if they succeed.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1324
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1325
     * @return a match result for the last match operation
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1326
     * @throws IllegalStateException  If no match result is available
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1327
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1328
    public MatchResult match() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1329
        if (!matchValid)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1330
            throw new IllegalStateException("No match result available");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1331
        return matcher.toMatchResult();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1332
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1333
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1334
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1335
     * <p>Returns the string representation of this <code>Scanner</code>. The
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1336
     * string representation of a <code>Scanner</code> contains information
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1337
     * that may be useful for debugging. The exact format is unspecified.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1338
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1339
     * @return  The string representation of this scanner
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1340
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1341
    public String toString() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1342
        StringBuilder sb = new StringBuilder();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1343
        sb.append("java.util.Scanner");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1344
        sb.append("[delimiters=" + delimPattern + "]");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1345
        sb.append("[position=" + position + "]");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1346
        sb.append("[match valid=" + matchValid + "]");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1347
        sb.append("[need input=" + needInput + "]");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1348
        sb.append("[source closed=" + sourceClosed + "]");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1349
        sb.append("[skipped=" + skipped + "]");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1350
        sb.append("[group separator=" + groupSeparator + "]");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1351
        sb.append("[decimal separator=" + decimalSeparator + "]");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1352
        sb.append("[positive prefix=" + positivePrefix + "]");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1353
        sb.append("[negative prefix=" + negativePrefix + "]");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1354
        sb.append("[positive suffix=" + positiveSuffix + "]");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1355
        sb.append("[negative suffix=" + negativeSuffix + "]");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1356
        sb.append("[NaN string=" + nanString + "]");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1357
        sb.append("[infinity string=" + infinityString + "]");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1358
        return sb.toString();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1359
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1360
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1361
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1362
     * Returns true if this scanner has another token in its input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1363
     * This method may block while waiting for input to scan.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1364
     * The scanner does not advance past any input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1365
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1366
     * @return true if and only if this scanner has another token
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1367
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1368
     * @see java.util.Iterator
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1369
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1370
    public boolean hasNext() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1371
        ensureOpen();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1372
        saveState();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1373
        while (!sourceClosed) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1374
            if (hasTokenInBuffer())
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1375
                return revertState(true);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1376
            readInput();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1377
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1378
        boolean result = hasTokenInBuffer();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1379
        return revertState(result);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1380
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1381
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1382
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1383
     * Finds and returns the next complete token from this scanner.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1384
     * A complete token is preceded and followed by input that matches
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1385
     * the delimiter pattern. This method may block while waiting for input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1386
     * to scan, even if a previous invocation of {@link #hasNext} returned
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1387
     * <code>true</code>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1388
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1389
     * @return the next token
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1390
     * @throws NoSuchElementException if no more tokens are available
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1391
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1392
     * @see java.util.Iterator
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1393
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1394
    public String next() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1395
        ensureOpen();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1396
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1397
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1398
        while (true) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1399
            String token = getCompleteTokenInBuffer(null);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1400
            if (token != null) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1401
                matchValid = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1402
                skipped = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1403
                return token;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1404
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1405
            if (needInput)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1406
                readInput();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1407
            else
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1408
                throwFor();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1409
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1410
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1411
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1412
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1413
     * The remove operation is not supported by this implementation of
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1414
     * <code>Iterator</code>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1415
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1416
     * @throws UnsupportedOperationException if this method is invoked.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1417
     * @see java.util.Iterator
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1418
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1419
    public void remove() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1420
        throw new UnsupportedOperationException();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1421
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1422
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1423
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1424
     * Returns true if the next token matches the pattern constructed from the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1425
     * specified string. The scanner does not advance past any input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1426
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1427
     * <p> An invocation of this method of the form <tt>hasNext(pattern)</tt>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1428
     * behaves in exactly the same way as the invocation
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1429
     * <tt>hasNext(Pattern.compile(pattern))</tt>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1430
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1431
     * @param pattern a string specifying the pattern to scan
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1432
     * @return true if and only if this scanner has another token matching
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1433
     *         the specified pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1434
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1435
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1436
    public boolean hasNext(String pattern)  {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1437
        return hasNext(patternCache.forName(pattern));
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1438
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1439
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1440
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1441
     * Returns the next token if it matches the pattern constructed from the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1442
     * specified string.  If the match is successful, the scanner advances
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1443
     * past the input that matched the pattern.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1444
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1445
     * <p> An invocation of this method of the form <tt>next(pattern)</tt>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1446
     * behaves in exactly the same way as the invocation
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1447
     * <tt>next(Pattern.compile(pattern))</tt>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1448
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1449
     * @param pattern a string specifying the pattern to scan
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1450
     * @return the next token
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1451
     * @throws NoSuchElementException if no such tokens are available
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1452
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1453
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1454
    public String next(String pattern)  {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1455
        return next(patternCache.forName(pattern));
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1456
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1457
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1458
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1459
     * Returns true if the next complete token matches the specified pattern.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1460
     * A complete token is prefixed and postfixed by input that matches
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1461
     * the delimiter pattern. This method may block while waiting for input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1462
     * The scanner does not advance past any input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1463
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1464
     * @param pattern the pattern to scan for
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1465
     * @return true if and only if this scanner has another token matching
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1466
     *         the specified pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1467
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1468
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1469
    public boolean hasNext(Pattern pattern) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1470
        ensureOpen();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1471
        if (pattern == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1472
            throw new NullPointerException();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1473
        hasNextPattern = null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1474
        saveState();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1475
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1476
        while (true) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1477
            if (getCompleteTokenInBuffer(pattern) != null) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1478
                matchValid = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1479
                cacheResult();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1480
                return revertState(true);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1481
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1482
            if (needInput)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1483
                readInput();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1484
            else
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1485
                return revertState(false);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1486
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1487
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1488
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1489
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1490
     * Returns the next token if it matches the specified pattern. This
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1491
     * method may block while waiting for input to scan, even if a previous
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1492
     * invocation of {@link #hasNext(Pattern)} returned <code>true</code>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1493
     * If the match is successful, the scanner advances past the input that
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1494
     * matched the pattern.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1495
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1496
     * @param pattern the pattern to scan for
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1497
     * @return the next token
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1498
     * @throws NoSuchElementException if no more tokens are available
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1499
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1500
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1501
    public String next(Pattern pattern) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1502
        ensureOpen();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1503
        if (pattern == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1504
            throw new NullPointerException();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1505
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1506
        // Did we already find this pattern?
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1507
        if (hasNextPattern == pattern)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1508
            return getCachedResult();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1509
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1510
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1511
        // Search for the pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1512
        while (true) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1513
            String token = getCompleteTokenInBuffer(pattern);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1514
            if (token != null) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1515
                matchValid = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1516
                skipped = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1517
                return token;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1518
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1519
            if (needInput)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1520
                readInput();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1521
            else
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1522
                throwFor();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1523
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1524
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1525
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1526
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1527
     * Returns true if there is another line in the input of this scanner.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1528
     * This method may block while waiting for input. The scanner does not
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1529
     * advance past any input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1530
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1531
     * @return true if and only if this scanner has another line of input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1532
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1533
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1534
    public boolean hasNextLine() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1535
        saveState();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1536
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1537
        String result = findWithinHorizon(linePattern(), 0);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1538
        if (result != null) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1539
            MatchResult mr = this.match();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1540
            String lineSep = mr.group(1);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1541
            if (lineSep != null) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1542
                result = result.substring(0, result.length() -
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1543
                                          lineSep.length());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1544
                cacheResult(result);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1545
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1546
            } else {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1547
                cacheResult();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1548
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1549
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1550
        revertState();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1551
        return (result != null);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1552
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1553
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1554
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1555
     * Advances this scanner past the current line and returns the input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1556
     * that was skipped.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1557
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1558
     * This method returns the rest of the current line, excluding any line
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1559
     * separator at the end. The position is set to the beginning of the next
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1560
     * line.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1561
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1562
     * <p>Since this method continues to search through the input looking
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1563
     * for a line separator, it may buffer all of the input searching for
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1564
     * the line to skip if no line separators are present.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1565
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1566
     * @return the line that was skipped
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1567
     * @throws NoSuchElementException if no line was found
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1568
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1569
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1570
    public String nextLine() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1571
        if (hasNextPattern == linePattern())
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1572
            return getCachedResult();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1573
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1574
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1575
        String result = findWithinHorizon(linePattern, 0);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1576
        if (result == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1577
            throw new NoSuchElementException("No line found");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1578
        MatchResult mr = this.match();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1579
        String lineSep = mr.group(1);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1580
        if (lineSep != null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1581
            result = result.substring(0, result.length() - lineSep.length());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1582
        if (result == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1583
            throw new NoSuchElementException();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1584
        else
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1585
            return result;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1586
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1587
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1588
    // Public methods that ignore delimiters
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1589
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1590
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1591
     * Attempts to find the next occurrence of a pattern constructed from the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1592
     * specified string, ignoring delimiters.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1593
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1594
     * <p>An invocation of this method of the form <tt>findInLine(pattern)</tt>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1595
     * behaves in exactly the same way as the invocation
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1596
     * <tt>findInLine(Pattern.compile(pattern))</tt>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1597
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1598
     * @param pattern a string specifying the pattern to search for
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1599
     * @return the text that matched the specified pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1600
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1601
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1602
    public String findInLine(String pattern) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1603
        return findInLine(patternCache.forName(pattern));
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1604
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1605
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1606
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1607
     * Attempts to find the next occurrence of the specified pattern ignoring
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1608
     * delimiters. If the pattern is found before the next line separator, the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1609
     * scanner advances past the input that matched and returns the string that
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1610
     * matched the pattern.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1611
     * If no such pattern is detected in the input up to the next line
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1612
     * separator, then <code>null</code> is returned and the scanner's
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1613
     * position is unchanged. This method may block waiting for input that
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1614
     * matches the pattern.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1615
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1616
     * <p>Since this method continues to search through the input looking
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1617
     * for the specified pattern, it may buffer all of the input searching for
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1618
     * the desired token if no line separators are present.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1619
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1620
     * @param pattern the pattern to scan for
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1621
     * @return the text that matched the specified pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1622
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1623
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1624
    public String findInLine(Pattern pattern) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1625
        ensureOpen();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1626
        if (pattern == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1627
            throw new NullPointerException();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1628
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1629
        // Expand buffer to include the next newline or end of input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1630
        int endPosition = 0;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1631
        saveState();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1632
        while (true) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1633
            String token = findPatternInBuffer(separatorPattern(), 0);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1634
            if (token != null) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1635
                endPosition = matcher.start();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1636
                break; // up to next newline
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1637
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1638
            if (needInput) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1639
                readInput();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1640
            } else {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1641
                endPosition = buf.limit();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1642
                break; // up to end of input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1643
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1644
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1645
        revertState();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1646
        int horizonForLine = endPosition - position;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1647
        // If there is nothing between the current pos and the next
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1648
        // newline simply return null, invoking findWithinHorizon
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1649
        // with "horizon=0" will scan beyond the line bound.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1650
        if (horizonForLine == 0)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1651
            return null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1652
        // Search for the pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1653
        return findWithinHorizon(pattern, horizonForLine);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1654
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1655
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1656
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1657
     * Attempts to find the next occurrence of a pattern constructed from the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1658
     * specified string, ignoring delimiters.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1659
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1660
     * <p>An invocation of this method of the form
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1661
     * <tt>findWithinHorizon(pattern)</tt> behaves in exactly the same way as
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1662
     * the invocation
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1663
     * <tt>findWithinHorizon(Pattern.compile(pattern, horizon))</tt>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1664
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1665
     * @param pattern a string specifying the pattern to search for
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1666
     * @return the text that matched the specified pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1667
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1668
     * @throws IllegalArgumentException if horizon is negative
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1669
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1670
    public String findWithinHorizon(String pattern, int horizon) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1671
        return findWithinHorizon(patternCache.forName(pattern), horizon);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1672
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1673
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1674
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1675
     * Attempts to find the next occurrence of the specified pattern.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1676
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1677
     * <p>This method searches through the input up to the specified
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1678
     * search horizon, ignoring delimiters. If the pattern is found the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1679
     * scanner advances past the input that matched and returns the string
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1680
     * that matched the pattern. If no such pattern is detected then the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1681
     * null is returned and the scanner's position remains unchanged. This
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1682
     * method may block waiting for input that matches the pattern.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1683
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1684
     * <p>A scanner will never search more than <code>horizon</code> code
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1685
     * points beyond its current position. Note that a match may be clipped
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1686
     * by the horizon; that is, an arbitrary match result may have been
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1687
     * different if the horizon had been larger. The scanner treats the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1688
     * horizon as a transparent, non-anchoring bound (see {@link
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1689
     * Matcher#useTransparentBounds} and {@link Matcher#useAnchoringBounds}).
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1690
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1691
     * <p>If horizon is <code>0</code>, then the horizon is ignored and
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1692
     * this method continues to search through the input looking for the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1693
     * specified pattern without bound. In this case it may buffer all of
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1694
     * the input searching for the pattern.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1695
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1696
     * <p>If horizon is negative, then an IllegalArgumentException is
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1697
     * thrown.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1698
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1699
     * @param pattern the pattern to scan for
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1700
     * @return the text that matched the specified pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1701
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1702
     * @throws IllegalArgumentException if horizon is negative
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1703
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1704
    public String findWithinHorizon(Pattern pattern, int horizon) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1705
        ensureOpen();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1706
        if (pattern == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1707
            throw new NullPointerException();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1708
        if (horizon < 0)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1709
            throw new IllegalArgumentException("horizon < 0");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1710
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1711
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1712
        // Search for the pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1713
        while (true) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1714
            String token = findPatternInBuffer(pattern, horizon);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1715
            if (token != null) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1716
                matchValid = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1717
                return token;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1718
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1719
            if (needInput)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1720
                readInput();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1721
            else
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1722
                break; // up to end of input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1723
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1724
        return null;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1725
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1726
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1727
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1728
     * Skips input that matches the specified pattern, ignoring delimiters.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1729
     * This method will skip input if an anchored match of the specified
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1730
     * pattern succeeds.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1731
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1732
     * <p>If a match to the specified pattern is not found at the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1733
     * current position, then no input is skipped and a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1734
     * <tt>NoSuchElementException</tt> is thrown.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1735
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1736
     * <p>Since this method seeks to match the specified pattern starting at
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1737
     * the scanner's current position, patterns that can match a lot of
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1738
     * input (".*", for example) may cause the scanner to buffer a large
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1739
     * amount of input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1740
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1741
     * <p>Note that it is possible to skip something without risking a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1742
     * <code>NoSuchElementException</code> by using a pattern that can
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1743
     * match nothing, e.g., <code>sc.skip("[ \t]*")</code>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1744
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1745
     * @param pattern a string specifying the pattern to skip over
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1746
     * @return this scanner
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1747
     * @throws NoSuchElementException if the specified pattern is not found
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1748
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1749
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1750
    public Scanner skip(Pattern pattern) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1751
        ensureOpen();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1752
        if (pattern == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1753
            throw new NullPointerException();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1754
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1755
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1756
        // Search for the pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1757
        while (true) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1758
            String token = matchPatternInBuffer(pattern);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1759
            if (token != null) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1760
                matchValid = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1761
                position = matcher.end();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1762
                return this;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1763
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1764
            if (needInput)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1765
                readInput();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1766
            else
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1767
                throw new NoSuchElementException();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1768
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1769
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1770
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1771
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1772
     * Skips input that matches a pattern constructed from the specified
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1773
     * string.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1774
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1775
     * <p> An invocation of this method of the form <tt>skip(pattern)</tt>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1776
     * behaves in exactly the same way as the invocation
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1777
     * <tt>skip(Pattern.compile(pattern))</tt>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1778
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1779
     * @param pattern a string specifying the pattern to skip over
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1780
     * @return this scanner
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1781
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1782
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1783
    public Scanner skip(String pattern) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1784
        return skip(patternCache.forName(pattern));
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1785
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1786
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1787
    // Convenience methods for scanning primitives
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1788
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1789
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1790
     * Returns true if the next token in this scanner's input can be
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1791
     * interpreted as a boolean value using a case insensitive pattern
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1792
     * created from the string "true|false".  The scanner does not
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1793
     * advance past the input that matched.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1794
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1795
     * @return true if and only if this scanner's next token is a valid
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1796
     *         boolean value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1797
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1798
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1799
    public boolean hasNextBoolean()  {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1800
        return hasNext(boolPattern());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1801
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1802
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1803
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1804
     * Scans the next token of the input into a boolean value and returns
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1805
     * that value. This method will throw <code>InputMismatchException</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1806
     * if the next token cannot be translated into a valid boolean value.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1807
     * If the match is successful, the scanner advances past the input that
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1808
     * matched.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1809
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1810
     * @return the boolean scanned from the input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1811
     * @throws InputMismatchException if the next token is not a valid boolean
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1812
     * @throws NoSuchElementException if input is exhausted
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1813
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1814
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1815
    public boolean nextBoolean()  {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1816
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1817
        return Boolean.parseBoolean(next(boolPattern()));
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1818
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1819
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1820
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1821
     * Returns true if the next token in this scanner's input can be
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1822
     * interpreted as a byte value in the default radix using the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1823
     * {@link #nextByte} method. The scanner does not advance past any input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1824
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1825
     * @return true if and only if this scanner's next token is a valid
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1826
     *         byte value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1827
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1828
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1829
    public boolean hasNextByte() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1830
        return hasNextByte(defaultRadix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1831
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1832
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1833
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1834
     * Returns true if the next token in this scanner's input can be
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1835
     * interpreted as a byte value in the specified radix using the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1836
     * {@link #nextByte} method. The scanner does not advance past any input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1837
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1838
     * @param radix the radix used to interpret the token as a byte value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1839
     * @return true if and only if this scanner's next token is a valid
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1840
     *         byte value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1841
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1842
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1843
    public boolean hasNextByte(int radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1844
        setRadix(radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1845
        boolean result = hasNext(integerPattern());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1846
        if (result) { // Cache it
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1847
            try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1848
                String s = (matcher.group(SIMPLE_GROUP_INDEX) == null) ?
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1849
                    processIntegerToken(hasNextResult) :
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1850
                    hasNextResult;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1851
                typeCache = Byte.parseByte(s, radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1852
            } catch (NumberFormatException nfe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1853
                result = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1854
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1855
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1856
        return result;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1857
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1858
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1859
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1860
     * Scans the next token of the input as a <tt>byte</tt>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1861
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1862
     * <p> An invocation of this method of the form
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1863
     * <tt>nextByte()</tt> behaves in exactly the same way as the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1864
     * invocation <tt>nextByte(radix)</tt>, where <code>radix</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1865
     * is the default radix of this scanner.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1866
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1867
     * @return the <tt>byte</tt> scanned from the input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1868
     * @throws InputMismatchException
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1869
     *         if the next token does not match the <i>Integer</i>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1870
     *         regular expression, or is out of range
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1871
     * @throws NoSuchElementException if input is exhausted
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1872
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1873
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1874
    public byte nextByte() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1875
         return nextByte(defaultRadix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1876
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1877
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1878
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1879
     * Scans the next token of the input as a <tt>byte</tt>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1880
     * This method will throw <code>InputMismatchException</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1881
     * if the next token cannot be translated into a valid byte value as
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1882
     * described below. If the translation is successful, the scanner advances
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1883
     * past the input that matched.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1884
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1885
     * <p> If the next token matches the <a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1886
     * href="#Integer-regex"><i>Integer</i></a> regular expression defined
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1887
     * above then the token is converted into a <tt>byte</tt> value as if by
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1888
     * removing all locale specific prefixes, group separators, and locale
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1889
     * specific suffixes, then mapping non-ASCII digits into ASCII
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1890
     * digits via {@link Character#digit Character.digit}, prepending a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1891
     * negative sign (-) if the locale specific negative prefixes and suffixes
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1892
     * were present, and passing the resulting string to
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1893
     * {@link Byte#parseByte(String, int) Byte.parseByte} with the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1894
     * specified radix.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1895
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1896
     * @param radix the radix used to interpret the token as a byte value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1897
     * @return the <tt>byte</tt> scanned from the input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1898
     * @throws InputMismatchException
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1899
     *         if the next token does not match the <i>Integer</i>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1900
     *         regular expression, or is out of range
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1901
     * @throws NoSuchElementException if input is exhausted
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1902
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1903
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1904
    public byte nextByte(int radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1905
        // Check cached result
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1906
        if ((typeCache != null) && (typeCache instanceof Byte)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1907
            && this.radix == radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1908
            byte val = ((Byte)typeCache).byteValue();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1909
            useTypeCache();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1910
            return val;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1911
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1912
        setRadix(radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1913
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1914
        // Search for next byte
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1915
        try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1916
            String s = next(integerPattern());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1917
            if (matcher.group(SIMPLE_GROUP_INDEX) == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1918
                s = processIntegerToken(s);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1919
            return Byte.parseByte(s, radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1920
        } catch (NumberFormatException nfe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1921
            position = matcher.start(); // don't skip bad token
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1922
            throw new InputMismatchException(nfe.getMessage());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1923
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1924
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1925
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1926
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1927
     * Returns true if the next token in this scanner's input can be
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1928
     * interpreted as a short value in the default radix using the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1929
     * {@link #nextShort} method. The scanner does not advance past any input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1930
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1931
     * @return true if and only if this scanner's next token is a valid
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1932
     *         short value in the default radix
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1933
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1934
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1935
    public boolean hasNextShort() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1936
        return hasNextShort(defaultRadix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1937
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1938
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1939
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1940
     * Returns true if the next token in this scanner's input can be
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1941
     * interpreted as a short value in the specified radix using the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1942
     * {@link #nextShort} method. The scanner does not advance past any input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1943
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1944
     * @param radix the radix used to interpret the token as a short value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1945
     * @return true if and only if this scanner's next token is a valid
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1946
     *         short value in the specified radix
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1947
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1948
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1949
    public boolean hasNextShort(int radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1950
        setRadix(radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1951
        boolean result = hasNext(integerPattern());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1952
        if (result) { // Cache it
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1953
            try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1954
                String s = (matcher.group(SIMPLE_GROUP_INDEX) == null) ?
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1955
                    processIntegerToken(hasNextResult) :
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1956
                    hasNextResult;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1957
                typeCache = Short.parseShort(s, radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1958
            } catch (NumberFormatException nfe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1959
                result = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1960
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1961
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1962
        return result;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1963
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1964
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1965
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1966
     * Scans the next token of the input as a <tt>short</tt>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1967
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1968
     * <p> An invocation of this method of the form
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1969
     * <tt>nextShort()</tt> behaves in exactly the same way as the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1970
     * invocation <tt>nextShort(radix)</tt>, where <code>radix</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1971
     * is the default radix of this scanner.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1972
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1973
     * @return the <tt>short</tt> scanned from the input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1974
     * @throws InputMismatchException
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1975
     *         if the next token does not match the <i>Integer</i>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1976
     *         regular expression, or is out of range
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1977
     * @throws NoSuchElementException if input is exhausted
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1978
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1979
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1980
    public short nextShort() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1981
        return nextShort(defaultRadix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1982
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1983
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1984
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1985
     * Scans the next token of the input as a <tt>short</tt>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1986
     * This method will throw <code>InputMismatchException</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1987
     * if the next token cannot be translated into a valid short value as
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1988
     * described below. If the translation is successful, the scanner advances
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1989
     * past the input that matched.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1990
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1991
     * <p> If the next token matches the <a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1992
     * href="#Integer-regex"><i>Integer</i></a> regular expression defined
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1993
     * above then the token is converted into a <tt>short</tt> value as if by
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1994
     * removing all locale specific prefixes, group separators, and locale
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1995
     * specific suffixes, then mapping non-ASCII digits into ASCII
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1996
     * digits via {@link Character#digit Character.digit}, prepending a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1997
     * negative sign (-) if the locale specific negative prefixes and suffixes
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1998
     * were present, and passing the resulting string to
90ce3da70b43 Initial load
duke
parents:
diff changeset
  1999
     * {@link Short#parseShort(String, int) Short.parseShort} with the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2000
     * specified radix.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2001
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2002
     * @param radix the radix used to interpret the token as a short value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2003
     * @return the <tt>short</tt> scanned from the input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2004
     * @throws InputMismatchException
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2005
     *         if the next token does not match the <i>Integer</i>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2006
     *         regular expression, or is out of range
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2007
     * @throws NoSuchElementException if input is exhausted
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2008
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2009
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2010
    public short nextShort(int radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2011
        // Check cached result
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2012
        if ((typeCache != null) && (typeCache instanceof Short)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2013
            && this.radix == radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2014
            short val = ((Short)typeCache).shortValue();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2015
            useTypeCache();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2016
            return val;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2017
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2018
        setRadix(radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2019
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2020
        // Search for next short
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2021
        try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2022
            String s = next(integerPattern());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2023
            if (matcher.group(SIMPLE_GROUP_INDEX) == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2024
                s = processIntegerToken(s);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2025
            return Short.parseShort(s, radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2026
        } catch (NumberFormatException nfe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2027
            position = matcher.start(); // don't skip bad token
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2028
            throw new InputMismatchException(nfe.getMessage());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2029
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2030
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2031
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2032
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2033
     * Returns true if the next token in this scanner's input can be
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2034
     * interpreted as an int value in the default radix using the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2035
     * {@link #nextInt} method. The scanner does not advance past any input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2036
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2037
     * @return true if and only if this scanner's next token is a valid
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2038
     *         int value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2039
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2040
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2041
    public boolean hasNextInt() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2042
        return hasNextInt(defaultRadix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2043
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2044
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2045
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2046
     * Returns true if the next token in this scanner's input can be
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2047
     * interpreted as an int value in the specified radix using the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2048
     * {@link #nextInt} method. The scanner does not advance past any input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2049
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2050
     * @param radix the radix used to interpret the token as an int value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2051
     * @return true if and only if this scanner's next token is a valid
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2052
     *         int value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2053
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2054
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2055
    public boolean hasNextInt(int radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2056
        setRadix(radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2057
        boolean result = hasNext(integerPattern());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2058
        if (result) { // Cache it
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2059
            try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2060
                String s = (matcher.group(SIMPLE_GROUP_INDEX) == null) ?
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2061
                    processIntegerToken(hasNextResult) :
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2062
                    hasNextResult;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2063
                typeCache = Integer.parseInt(s, radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2064
            } catch (NumberFormatException nfe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2065
                result = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2066
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2067
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2068
        return result;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2069
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2070
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2071
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2072
     * The integer token must be stripped of prefixes, group separators,
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2073
     * and suffixes, non ascii digits must be converted into ascii digits
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2074
     * before parse will accept it.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2075
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2076
    private String processIntegerToken(String token) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2077
        String result = token.replaceAll(""+groupSeparator, "");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2078
        boolean isNegative = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2079
        int preLen = negativePrefix.length();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2080
        if ((preLen > 0) && result.startsWith(negativePrefix)) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2081
            isNegative = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2082
            result = result.substring(preLen);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2083
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2084
        int sufLen = negativeSuffix.length();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2085
        if ((sufLen > 0) && result.endsWith(negativeSuffix)) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2086
            isNegative = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2087
            result = result.substring(result.length() - sufLen,
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2088
                                      result.length());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2089
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2090
        if (isNegative)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2091
            result = "-" + result;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2092
        return result;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2093
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2094
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2095
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2096
     * Scans the next token of the input as an <tt>int</tt>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2097
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2098
     * <p> An invocation of this method of the form
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2099
     * <tt>nextInt()</tt> behaves in exactly the same way as the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2100
     * invocation <tt>nextInt(radix)</tt>, where <code>radix</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2101
     * is the default radix of this scanner.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2102
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2103
     * @return the <tt>int</tt> scanned from the input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2104
     * @throws InputMismatchException
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2105
     *         if the next token does not match the <i>Integer</i>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2106
     *         regular expression, or is out of range
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2107
     * @throws NoSuchElementException if input is exhausted
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2108
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2109
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2110
    public int nextInt() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2111
        return nextInt(defaultRadix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2112
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2113
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2114
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2115
     * Scans the next token of the input as an <tt>int</tt>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2116
     * This method will throw <code>InputMismatchException</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2117
     * if the next token cannot be translated into a valid int value as
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2118
     * described below. If the translation is successful, the scanner advances
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2119
     * past the input that matched.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2120
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2121
     * <p> If the next token matches the <a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2122
     * href="#Integer-regex"><i>Integer</i></a> regular expression defined
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2123
     * above then the token is converted into an <tt>int</tt> value as if by
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2124
     * removing all locale specific prefixes, group separators, and locale
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2125
     * specific suffixes, then mapping non-ASCII digits into ASCII
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2126
     * digits via {@link Character#digit Character.digit}, prepending a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2127
     * negative sign (-) if the locale specific negative prefixes and suffixes
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2128
     * were present, and passing the resulting string to
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2129
     * {@link Integer#parseInt(String, int) Integer.parseInt} with the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2130
     * specified radix.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2131
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2132
     * @param radix the radix used to interpret the token as an int value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2133
     * @return the <tt>int</tt> scanned from the input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2134
     * @throws InputMismatchException
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2135
     *         if the next token does not match the <i>Integer</i>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2136
     *         regular expression, or is out of range
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2137
     * @throws NoSuchElementException if input is exhausted
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2138
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2139
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2140
    public int nextInt(int radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2141
        // Check cached result
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2142
        if ((typeCache != null) && (typeCache instanceof Integer)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2143
            && this.radix == radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2144
            int val = ((Integer)typeCache).intValue();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2145
            useTypeCache();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2146
            return val;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2147
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2148
        setRadix(radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2149
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2150
        // Search for next int
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2151
        try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2152
            String s = next(integerPattern());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2153
            if (matcher.group(SIMPLE_GROUP_INDEX) == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2154
                s = processIntegerToken(s);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2155
            return Integer.parseInt(s, radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2156
        } catch (NumberFormatException nfe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2157
            position = matcher.start(); // don't skip bad token
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2158
            throw new InputMismatchException(nfe.getMessage());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2159
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2160
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2161
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2162
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2163
     * Returns true if the next token in this scanner's input can be
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2164
     * interpreted as a long value in the default radix using the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2165
     * {@link #nextLong} method. The scanner does not advance past any input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2166
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2167
     * @return true if and only if this scanner's next token is a valid
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2168
     *         long value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2169
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2170
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2171
    public boolean hasNextLong() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2172
        return hasNextLong(defaultRadix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2173
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2174
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2175
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2176
     * Returns true if the next token in this scanner's input can be
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2177
     * interpreted as a long value in the specified radix using the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2178
     * {@link #nextLong} method. The scanner does not advance past any input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2179
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2180
     * @param radix the radix used to interpret the token as a long value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2181
     * @return true if and only if this scanner's next token is a valid
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2182
     *         long value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2183
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2184
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2185
    public boolean hasNextLong(int radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2186
        setRadix(radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2187
        boolean result = hasNext(integerPattern());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2188
        if (result) { // Cache it
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2189
            try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2190
                String s = (matcher.group(SIMPLE_GROUP_INDEX) == null) ?
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2191
                    processIntegerToken(hasNextResult) :
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2192
                    hasNextResult;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2193
                typeCache = Long.parseLong(s, radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2194
            } catch (NumberFormatException nfe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2195
                result = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2196
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2197
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2198
        return result;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2199
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2200
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2201
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2202
     * Scans the next token of the input as a <tt>long</tt>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2203
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2204
     * <p> An invocation of this method of the form
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2205
     * <tt>nextLong()</tt> behaves in exactly the same way as the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2206
     * invocation <tt>nextLong(radix)</tt>, where <code>radix</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2207
     * is the default radix of this scanner.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2208
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2209
     * @return the <tt>long</tt> scanned from the input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2210
     * @throws InputMismatchException
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2211
     *         if the next token does not match the <i>Integer</i>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2212
     *         regular expression, or is out of range
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2213
     * @throws NoSuchElementException if input is exhausted
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2214
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2215
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2216
    public long nextLong() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2217
        return nextLong(defaultRadix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2218
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2219
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2220
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2221
     * Scans the next token of the input as a <tt>long</tt>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2222
     * This method will throw <code>InputMismatchException</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2223
     * if the next token cannot be translated into a valid long value as
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2224
     * described below. If the translation is successful, the scanner advances
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2225
     * past the input that matched.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2226
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2227
     * <p> If the next token matches the <a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2228
     * href="#Integer-regex"><i>Integer</i></a> regular expression defined
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2229
     * above then the token is converted into a <tt>long</tt> value as if by
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2230
     * removing all locale specific prefixes, group separators, and locale
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2231
     * specific suffixes, then mapping non-ASCII digits into ASCII
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2232
     * digits via {@link Character#digit Character.digit}, prepending a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2233
     * negative sign (-) if the locale specific negative prefixes and suffixes
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2234
     * were present, and passing the resulting string to
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2235
     * {@link Long#parseLong(String, int) Long.parseLong} with the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2236
     * specified radix.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2237
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2238
     * @param radix the radix used to interpret the token as an int value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2239
     * @return the <tt>long</tt> scanned from the input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2240
     * @throws InputMismatchException
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2241
     *         if the next token does not match the <i>Integer</i>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2242
     *         regular expression, or is out of range
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2243
     * @throws NoSuchElementException if input is exhausted
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2244
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2245
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2246
    public long nextLong(int radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2247
        // Check cached result
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2248
        if ((typeCache != null) && (typeCache instanceof Long)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2249
            && this.radix == radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2250
            long val = ((Long)typeCache).longValue();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2251
            useTypeCache();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2252
            return val;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2253
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2254
        setRadix(radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2255
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2256
        try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2257
            String s = next(integerPattern());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2258
            if (matcher.group(SIMPLE_GROUP_INDEX) == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2259
                s = processIntegerToken(s);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2260
            return Long.parseLong(s, radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2261
        } catch (NumberFormatException nfe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2262
            position = matcher.start(); // don't skip bad token
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2263
            throw new InputMismatchException(nfe.getMessage());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2264
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2265
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2266
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2267
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2268
     * The float token must be stripped of prefixes, group separators,
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2269
     * and suffixes, non ascii digits must be converted into ascii digits
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2270
     * before parseFloat will accept it.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2271
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2272
     * If there are non-ascii digits in the token these digits must
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2273
     * be processed before the token is passed to parseFloat.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2274
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2275
    private String processFloatToken(String token) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2276
        String result = token.replaceAll(groupSeparator, "");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2277
        if (!decimalSeparator.equals("\\."))
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2278
            result = result.replaceAll(decimalSeparator, ".");
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2279
        boolean isNegative = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2280
        int preLen = negativePrefix.length();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2281
        if ((preLen > 0) && result.startsWith(negativePrefix)) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2282
            isNegative = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2283
            result = result.substring(preLen);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2284
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2285
        int sufLen = negativeSuffix.length();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2286
        if ((sufLen > 0) && result.endsWith(negativeSuffix)) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2287
            isNegative = true;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2288
            result = result.substring(result.length() - sufLen,
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2289
                                      result.length());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2290
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2291
        if (result.equals(nanString))
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2292
            result = "NaN";
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2293
        if (result.equals(infinityString))
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2294
            result = "Infinity";
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2295
        if (isNegative)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2296
            result = "-" + result;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2297
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2298
        // Translate non-ASCII digits
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2299
        Matcher m = NON_ASCII_DIGIT.matcher(result);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2300
        if (m.find()) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2301
            StringBuilder inASCII = new StringBuilder();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2302
            for (int i=0; i<result.length(); i++) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2303
                char nextChar = result.charAt(i);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2304
                if (Character.isDigit(nextChar)) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2305
                    int d = Character.digit(nextChar, 10);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2306
                    if (d != -1)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2307
                        inASCII.append(d);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2308
                    else
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2309
                        inASCII.append(nextChar);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2310
                } else {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2311
                    inASCII.append(nextChar);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2312
                }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2313
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2314
            result = inASCII.toString();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2315
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2316
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2317
        return result;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2318
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2319
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2320
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2321
     * Returns true if the next token in this scanner's input can be
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2322
     * interpreted as a float value using the {@link #nextFloat}
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2323
     * method. The scanner does not advance past any input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2324
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2325
     * @return true if and only if this scanner's next token is a valid
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2326
     *         float value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2327
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2328
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2329
    public boolean hasNextFloat() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2330
        setRadix(10);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2331
        boolean result = hasNext(floatPattern());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2332
        if (result) { // Cache it
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2333
            try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2334
                String s = processFloatToken(hasNextResult);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2335
                typeCache = Float.valueOf(Float.parseFloat(s));
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2336
            } catch (NumberFormatException nfe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2337
                result = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2338
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2339
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2340
        return result;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2341
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2342
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2343
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2344
     * Scans the next token of the input as a <tt>float</tt>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2345
     * This method will throw <code>InputMismatchException</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2346
     * if the next token cannot be translated into a valid float value as
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2347
     * described below. If the translation is successful, the scanner advances
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2348
     * past the input that matched.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2349
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2350
     * <p> If the next token matches the <a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2351
     * href="#Float-regex"><i>Float</i></a> regular expression defined above
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2352
     * then the token is converted into a <tt>float</tt> value as if by
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2353
     * removing all locale specific prefixes, group separators, and locale
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2354
     * specific suffixes, then mapping non-ASCII digits into ASCII
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2355
     * digits via {@link Character#digit Character.digit}, prepending a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2356
     * negative sign (-) if the locale specific negative prefixes and suffixes
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2357
     * were present, and passing the resulting string to
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2358
     * {@link Float#parseFloat Float.parseFloat}. If the token matches
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2359
     * the localized NaN or infinity strings, then either "Nan" or "Infinity"
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2360
     * is passed to {@link Float#parseFloat(String) Float.parseFloat} as
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2361
     * appropriate.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2362
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2363
     * @return the <tt>float</tt> scanned from the input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2364
     * @throws InputMismatchException
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2365
     *         if the next token does not match the <i>Float</i>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2366
     *         regular expression, or is out of range
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2367
     * @throws NoSuchElementException if input is exhausted
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2368
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2369
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2370
    public float nextFloat() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2371
        // Check cached result
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2372
        if ((typeCache != null) && (typeCache instanceof Float)) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2373
            float val = ((Float)typeCache).floatValue();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2374
            useTypeCache();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2375
            return val;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2376
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2377
        setRadix(10);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2378
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2379
        try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2380
            return Float.parseFloat(processFloatToken(next(floatPattern())));
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2381
        } catch (NumberFormatException nfe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2382
            position = matcher.start(); // don't skip bad token
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2383
            throw new InputMismatchException(nfe.getMessage());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2384
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2385
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2386
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2387
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2388
     * Returns true if the next token in this scanner's input can be
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2389
     * interpreted as a double value using the {@link #nextDouble}
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2390
     * method. The scanner does not advance past any input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2391
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2392
     * @return true if and only if this scanner's next token is a valid
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2393
     *         double value
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2394
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2395
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2396
    public boolean hasNextDouble() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2397
        setRadix(10);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2398
        boolean result = hasNext(floatPattern());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2399
        if (result) { // Cache it
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2400
            try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2401
                String s = processFloatToken(hasNextResult);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2402
                typeCache = Double.valueOf(Double.parseDouble(s));
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2403
            } catch (NumberFormatException nfe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2404
                result = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2405
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2406
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2407
        return result;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2408
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2409
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2410
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2411
     * Scans the next token of the input as a <tt>double</tt>.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2412
     * This method will throw <code>InputMismatchException</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2413
     * if the next token cannot be translated into a valid double value.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2414
     * If the translation is successful, the scanner advances past the input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2415
     * that matched.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2416
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2417
     * <p> If the next token matches the <a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2418
     * href="#Float-regex"><i>Float</i></a> regular expression defined above
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2419
     * then the token is converted into a <tt>double</tt> value as if by
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2420
     * removing all locale specific prefixes, group separators, and locale
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2421
     * specific suffixes, then mapping non-ASCII digits into ASCII
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2422
     * digits via {@link Character#digit Character.digit}, prepending a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2423
     * negative sign (-) if the locale specific negative prefixes and suffixes
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2424
     * were present, and passing the resulting string to
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2425
     * {@link Double#parseDouble Double.parseDouble}. If the token matches
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2426
     * the localized NaN or infinity strings, then either "Nan" or "Infinity"
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2427
     * is passed to {@link Double#parseDouble(String) Double.parseDouble} as
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2428
     * appropriate.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2429
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2430
     * @return the <tt>double</tt> scanned from the input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2431
     * @throws InputMismatchException
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2432
     *         if the next token does not match the <i>Float</i>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2433
     *         regular expression, or is out of range
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2434
     * @throws NoSuchElementException if the input is exhausted
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2435
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2436
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2437
    public double nextDouble() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2438
        // Check cached result
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2439
        if ((typeCache != null) && (typeCache instanceof Double)) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2440
            double val = ((Double)typeCache).doubleValue();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2441
            useTypeCache();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2442
            return val;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2443
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2444
        setRadix(10);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2445
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2446
        // Search for next float
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2447
        try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2448
            return Double.parseDouble(processFloatToken(next(floatPattern())));
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2449
        } catch (NumberFormatException nfe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2450
            position = matcher.start(); // don't skip bad token
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2451
            throw new InputMismatchException(nfe.getMessage());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2452
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2453
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2454
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2455
    // Convenience methods for scanning multi precision numbers
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2456
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2457
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2458
     * Returns true if the next token in this scanner's input can be
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2459
     * interpreted as a <code>BigInteger</code> in the default radix using the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2460
     * {@link #nextBigInteger} method. The scanner does not advance past any
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2461
     * input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2462
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2463
     * @return true if and only if this scanner's next token is a valid
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2464
     *         <code>BigInteger</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2465
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2466
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2467
    public boolean hasNextBigInteger() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2468
        return hasNextBigInteger(defaultRadix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2469
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2470
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2471
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2472
     * Returns true if the next token in this scanner's input can be
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2473
     * interpreted as a <code>BigInteger</code> in the specified radix using
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2474
     * the {@link #nextBigInteger} method. The scanner does not advance past
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2475
     * any input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2476
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2477
     * @param radix the radix used to interpret the token as an integer
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2478
     * @return true if and only if this scanner's next token is a valid
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2479
     *         <code>BigInteger</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2480
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2481
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2482
    public boolean hasNextBigInteger(int radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2483
        setRadix(radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2484
        boolean result = hasNext(integerPattern());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2485
        if (result) { // Cache it
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2486
            try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2487
                String s = (matcher.group(SIMPLE_GROUP_INDEX) == null) ?
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2488
                    processIntegerToken(hasNextResult) :
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2489
                    hasNextResult;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2490
                typeCache = new BigInteger(s, radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2491
            } catch (NumberFormatException nfe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2492
                result = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2493
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2494
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2495
        return result;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2496
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2497
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2498
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2499
     * Scans the next token of the input as a {@link java.math.BigInteger
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2500
     * BigInteger}.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2501
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2502
     * <p> An invocation of this method of the form
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2503
     * <tt>nextBigInteger()</tt> behaves in exactly the same way as the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2504
     * invocation <tt>nextBigInteger(radix)</tt>, where <code>radix</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2505
     * is the default radix of this scanner.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2506
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2507
     * @return the <tt>BigInteger</tt> scanned from the input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2508
     * @throws InputMismatchException
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2509
     *         if the next token does not match the <i>Integer</i>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2510
     *         regular expression, or is out of range
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2511
     * @throws NoSuchElementException if the input is exhausted
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2512
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2513
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2514
    public BigInteger nextBigInteger() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2515
        return nextBigInteger(defaultRadix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2516
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2517
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2518
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2519
     * Scans the next token of the input as a {@link java.math.BigInteger
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2520
     * BigInteger}.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2521
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2522
     * <p> If the next token matches the <a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2523
     * href="#Integer-regex"><i>Integer</i></a> regular expression defined
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2524
     * above then the token is converted into a <tt>BigInteger</tt> value as if
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2525
     * by removing all group separators, mapping non-ASCII digits into ASCII
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2526
     * digits via the {@link Character#digit Character.digit}, and passing the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2527
     * resulting string to the {@link
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2528
     * java.math.BigInteger#BigInteger(java.lang.String)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2529
     * BigInteger(String, int)} constructor with the specified radix.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2530
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2531
     * @param radix the radix used to interpret the token
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2532
     * @return the <tt>BigInteger</tt> scanned from the input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2533
     * @throws InputMismatchException
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2534
     *         if the next token does not match the <i>Integer</i>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2535
     *         regular expression, or is out of range
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2536
     * @throws NoSuchElementException if the input is exhausted
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2537
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2538
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2539
    public BigInteger nextBigInteger(int radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2540
        // Check cached result
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2541
        if ((typeCache != null) && (typeCache instanceof BigInteger)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2542
            && this.radix == radix) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2543
            BigInteger val = (BigInteger)typeCache;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2544
            useTypeCache();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2545
            return val;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2546
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2547
        setRadix(radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2548
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2549
        // Search for next int
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2550
        try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2551
            String s = next(integerPattern());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2552
            if (matcher.group(SIMPLE_GROUP_INDEX) == null)
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2553
                s = processIntegerToken(s);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2554
            return new BigInteger(s, radix);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2555
        } catch (NumberFormatException nfe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2556
            position = matcher.start(); // don't skip bad token
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2557
            throw new InputMismatchException(nfe.getMessage());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2558
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2559
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2560
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2561
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2562
     * Returns true if the next token in this scanner's input can be
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2563
     * interpreted as a <code>BigDecimal</code> using the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2564
     * {@link #nextBigDecimal} method. The scanner does not advance past any
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2565
     * input.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2566
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2567
     * @return true if and only if this scanner's next token is a valid
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2568
     *         <code>BigDecimal</code>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2569
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2570
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2571
    public boolean hasNextBigDecimal() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2572
        setRadix(10);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2573
        boolean result = hasNext(decimalPattern());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2574
        if (result) { // Cache it
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2575
            try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2576
                String s = processFloatToken(hasNextResult);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2577
                typeCache = new BigDecimal(s);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2578
            } catch (NumberFormatException nfe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2579
                result = false;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2580
            }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2581
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2582
        return result;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2583
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2584
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2585
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2586
     * Scans the next token of the input as a {@link java.math.BigDecimal
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2587
     * BigDecimal}.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2588
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2589
     * <p> If the next token matches the <a
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2590
     * href="#Decimal-regex"><i>Decimal</i></a> regular expression defined
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2591
     * above then the token is converted into a <tt>BigDecimal</tt> value as if
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2592
     * by removing all group separators, mapping non-ASCII digits into ASCII
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2593
     * digits via the {@link Character#digit Character.digit}, and passing the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2594
     * resulting string to the {@link
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2595
     * java.math.BigDecimal#BigDecimal(java.lang.String) BigDecimal(String)}
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2596
     * constructor.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2597
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2598
     * @return the <tt>BigDecimal</tt> scanned from the input
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2599
     * @throws InputMismatchException
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2600
     *         if the next token does not match the <i>Decimal</i>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2601
     *         regular expression, or is out of range
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2602
     * @throws NoSuchElementException if the input is exhausted
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2603
     * @throws IllegalStateException if this scanner is closed
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2604
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2605
    public BigDecimal nextBigDecimal() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2606
        // Check cached result
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2607
        if ((typeCache != null) && (typeCache instanceof BigDecimal)) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2608
            BigDecimal val = (BigDecimal)typeCache;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2609
            useTypeCache();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2610
            return val;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2611
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2612
        setRadix(10);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2613
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2614
        // Search for next float
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2615
        try {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2616
            String s = processFloatToken(next(decimalPattern()));
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2617
            return new BigDecimal(s);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2618
        } catch (NumberFormatException nfe) {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2619
            position = matcher.start(); // don't skip bad token
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2620
            throw new InputMismatchException(nfe.getMessage());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2621
        }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2622
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2623
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2624
    /**
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2625
     * Resets this scanner.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2626
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2627
     * <p> Resetting a scanner discards all of its explicit state
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2628
     * information which may have been changed by invocations of {@link
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2629
     * #useDelimiter}, {@link #useLocale}, or {@link #useRadix}.
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2630
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2631
     * <p> An invocation of this method of the form
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2632
     * <tt>scanner.reset()</tt> behaves in exactly the same way as the
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2633
     * invocation
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2634
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2635
     * <blockquote><pre>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2636
     *   scanner.useDelimiter("\\p{javaWhitespace}+")
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2637
     *          .useLocale(Locale.getDefault())
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2638
     *          .useRadix(10);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2639
     * </pre></blockquote>
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2640
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2641
     * @return this scanner
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2642
     *
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2643
     * @since 1.6
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2644
     */
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2645
    public Scanner reset() {
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2646
        delimPattern = WHITESPACE_PATTERN;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2647
        useLocale(Locale.getDefault());
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2648
        useRadix(10);
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2649
        clearCaches();
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2650
        return this;
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2651
    }
90ce3da70b43 Initial load
duke
parents:
diff changeset
  2652
}