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/*
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* Copyright 2003-2006 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.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 </i></td>
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* <td valign="top">The character used to separate thousands groups,
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* <i>i.e.,</i> <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 </i></td>
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* <td valign="top">The character used for the decimal point,
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* <i>i.e.,</i> <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 </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> <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 </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> <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 </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> <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 </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> <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 </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> <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 </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> <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> ::</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 true</td></tr>
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*
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* <tr><td> </td></tr>
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*
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* <tr><td align=right><i>Non0Digit</i> ::</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> </td></tr>
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*
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* <tr><td align=right><i>Digit</i> ::</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> </td></tr>
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*
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* <tr><td valign=top align=right><i>GroupedNumeral</i> ::</td>
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* <td valign=top>
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* <table cellpadding=0 cellspacing=0>
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* <tr><td><tt>= ( </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>( </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> </td></tr>
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*
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* <tr><td align=right><i>Numeral</i> ::</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> </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> ::</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> </td></tr>
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*
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* <tr><td align=right><i>DecimalNumeral</i> ::</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> </td></tr>
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*
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* <tr><td align=right><i>Exponent</i> ::</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> </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> ::</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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298 |
* </tt><i>LocalNegativeSuffix</i>
|
|
|
299 |
* </tt><i>Exponent</i><tt>?</td></tr>
|
|
|
300 |
*
|
|
|
301 |
* <tr><td> </td></tr>
|
|
|
302 |
*
|
|
|
303 |
* <tr><td align=right><i>HexFloat</i> ::</td>
|
|
|
304 |
* <td><tt>= [-+]? 0[xX][0-9a-fA-F]*\.[0-9a-fA-F]+
|
|
|
305 |
* ([pP][-+]?[0-9]+)?</tt></td></tr>
|
|
|
306 |
*
|
|
|
307 |
* <tr><td> </td></tr>
|
|
|
308 |
*
|
|
|
309 |
* <tr><td align=right><i>NonNumber</i> ::</td>
|
|
|
310 |
* <td valign=top><tt>= NaN
|
|
|
311 |
* | </tt><i>LocalNan</i><tt>
|
|
|
312 |
* | Infinity
|
|
|
313 |
* | </tt><i>LocalInfinity</i></td></tr>
|
|
|
314 |
*
|
|
|
315 |
* <tr><td> </td></tr>
|
|
|
316 |
*
|
|
|
317 |
* <tr><td align=right><i>SignedNonNumber</i> ::</td>
|
|
|
318 |
* <td><tt>= ( [-+]? </tt><i>NonNumber</i><tt> )</tt></td></tr>
|
|
|
319 |
* <tr><td></td>
|
|
|
320 |
* <td><tt>| </tt><i>LocalPositivePrefix</i><tt>
|
|
|
321 |
* </tt><i>NonNumber</i><tt>
|
|
|
322 |
* </tt><i>LocalPositiveSuffix</i></td></tr>
|
|
|
323 |
* <tr><td></td>
|
|
|
324 |
* <td><tt>| </tt><i>LocalNegativePrefix</i><tt>
|
|
|
325 |
* </tt><i>NonNumber</i><tt>
|
|
|
326 |
* </tt><i>LocalNegativeSuffix</i></td></tr>
|
|
|
327 |
*
|
|
|
328 |
* <tr><td> </td></tr>
|
|
|
329 |
*
|
|
|
330 |
* <tr><td valign=top align=right>
|
|
|
331 |
* <a name="Float-regex"><i>Float</i> ::</td>
|
|
|
332 |
* <td valign=top><tt>= </tt><i>Decimal</i><tt></td></tr>
|
|
|
333 |
* <tr><td></td>
|
|
|
334 |
* <td><tt>| </tt><i>HexFloat</i><tt></td></tr>
|
|
|
335 |
* <tr><td></td>
|
|
|
336 |
* <td><tt>| </tt><i>SignedNonNumber</i><tt></td></tr>
|
|
|
337 |
*
|
|
|
338 |
* </table>
|
|
|
339 |
* </center>
|
|
|
340 |
*
|
|
|
341 |
* <p> Whitespace is not significant in the above regular expressions.
|
|
|
342 |
*
|
|
|
343 |
* @since 1.5
|
|
|
344 |
*/
|
|
|
345 |
public final class Scanner implements Iterator<String> {
|
|
|
346 |
|
|
|
347 |
// Internal buffer used to hold input
|
|
|
348 |
private CharBuffer buf;
|
|
|
349 |
|
|
|
350 |
// Size of internal character buffer
|
|
|
351 |
private static final int BUFFER_SIZE = 1024; // change to 1024;
|
|
|
352 |
|
|
|
353 |
// The index into the buffer currently held by the Scanner
|
|
|
354 |
private int position;
|
|
|
355 |
|
|
|
356 |
// Internal matcher used for finding delimiters
|
|
|
357 |
private Matcher matcher;
|
|
|
358 |
|
|
|
359 |
// Pattern used to delimit tokens
|
|
|
360 |
private Pattern delimPattern;
|
|
|
361 |
|
|
|
362 |
// Pattern found in last hasNext operation
|
|
|
363 |
private Pattern hasNextPattern;
|
|
|
364 |
|
|
|
365 |
// Position after last hasNext operation
|
|
|
366 |
private int hasNextPosition;
|
|
|
367 |
|
|
|
368 |
// Result after last hasNext operation
|
|
|
369 |
private String hasNextResult;
|
|
|
370 |
|
|
|
371 |
// The input source
|
|
|
372 |
private Readable source;
|
|
|
373 |
|
|
|
374 |
// Boolean is true if source is done
|
|
|
375 |
private boolean sourceClosed = false;
|
|
|
376 |
|
|
|
377 |
// Boolean indicating more input is required
|
|
|
378 |
private boolean needInput = false;
|
|
|
379 |
|
|
|
380 |
// Boolean indicating if a delim has been skipped this operation
|
|
|
381 |
private boolean skipped = false;
|
|
|
382 |
|
|
|
383 |
// A store of a position that the scanner may fall back to
|
|
|
384 |
private int savedScannerPosition = -1;
|
|
|
385 |
|
|
|
386 |
// A cache of the last primitive type scanned
|
|
|
387 |
private Object typeCache = null;
|
|
|
388 |
|
|
|
389 |
// Boolean indicating if a match result is available
|
|
|
390 |
private boolean matchValid = false;
|
|
|
391 |
|
|
|
392 |
// Boolean indicating if this scanner has been closed
|
|
|
393 |
private boolean closed = false;
|
|
|
394 |
|
|
|
395 |
// The current radix used by this scanner
|
|
|
396 |
private int radix = 10;
|
|
|
397 |
|
|
|
398 |
// The default radix for this scanner
|
|
|
399 |
private int defaultRadix = 10;
|
|
|
400 |
|
|
|
401 |
// The locale used by this scanner
|
|
|
402 |
private Locale locale = null;
|
|
|
403 |
|
|
|
404 |
// A cache of the last few recently used Patterns
|
|
|
405 |
private LRUCache<String,Pattern> patternCache =
|
|
|
406 |
new LRUCache<String,Pattern>(7) {
|
|
|
407 |
protected Pattern create(String s) {
|
|
|
408 |
return Pattern.compile(s);
|
|
|
409 |
}
|
|
|
410 |
protected boolean hasName(Pattern p, String s) {
|
|
|
411 |
return p.pattern().equals(s);
|
|
|
412 |
}
|
|
|
413 |
};
|
|
|
414 |
|
|
|
415 |
// A holder of the last IOException encountered
|
|
|
416 |
private IOException lastException;
|
|
|
417 |
|
|
|
418 |
// A pattern for java whitespace
|
|
|
419 |
private static Pattern WHITESPACE_PATTERN = Pattern.compile(
|
|
|
420 |
"\\p{javaWhitespace}+");
|
|
|
421 |
|
|
|
422 |
// A pattern for any token
|
|
|
423 |
private static Pattern FIND_ANY_PATTERN = Pattern.compile("(?s).*");
|
|
|
424 |
|
|
|
425 |
// A pattern for non-ASCII digits
|
|
|
426 |
private static Pattern NON_ASCII_DIGIT = Pattern.compile(
|
|
|
427 |
"[\\p{javaDigit}&&[^0-9]]");
|
|
|
428 |
|
|
|
429 |
// Fields and methods to support scanning primitive types
|
|
|
430 |
|
|
|
431 |
/**
|
|
|
432 |
* Locale dependent values used to scan numbers
|
|
|
433 |
*/
|
|
|
434 |
private String groupSeparator = "\\,";
|
|
|
435 |
private String decimalSeparator = "\\.";
|
|
|
436 |
private String nanString = "NaN";
|
|
|
437 |
private String infinityString = "Infinity";
|
|
|
438 |
private String positivePrefix = "";
|
|
|
439 |
private String negativePrefix = "\\-";
|
|
|
440 |
private String positiveSuffix = "";
|
|
|
441 |
private String negativeSuffix = "";
|
|
|
442 |
|
|
|
443 |
/**
|
|
|
444 |
* Fields and an accessor method to match booleans
|
|
|
445 |
*/
|
|
|
446 |
private static volatile Pattern boolPattern;
|
|
|
447 |
private static final String BOOLEAN_PATTERN = "true|false";
|
|
|
448 |
private static Pattern boolPattern() {
|
|
|
449 |
Pattern bp = boolPattern;
|
|
|
450 |
if (bp == null)
|
|
|
451 |
boolPattern = bp = Pattern.compile(BOOLEAN_PATTERN,
|
|
|
452 |
Pattern.CASE_INSENSITIVE);
|
|
|
453 |
return bp;
|
|
|
454 |
}
|
|
|
455 |
|
|
|
456 |
/**
|
|
|
457 |
* Fields and methods to match bytes, shorts, ints, and longs
|
|
|
458 |
*/
|
|
|
459 |
private Pattern integerPattern;
|
|
|
460 |
private String digits = "0123456789abcdefghijklmnopqrstuvwxyz";
|
|
|
461 |
private String non0Digit = "[\\p{javaDigit}&&[^0]]";
|
|
|
462 |
private int SIMPLE_GROUP_INDEX = 5;
|
|
|
463 |
private String buildIntegerPatternString() {
|
|
|
464 |
String radixDigits = digits.substring(0, radix);
|
|
|
465 |
// \\p{javaDigit} is not guaranteed to be appropriate
|
|
|
466 |
// here but what can we do? The final authority will be
|
|
|
467 |
// whatever parse method is invoked, so ultimately the
|
|
|
468 |
// Scanner will do the right thing
|
|
|
469 |
String digit = "((?i)["+radixDigits+"]|\\p{javaDigit})";
|
|
|
470 |
String groupedNumeral = "("+non0Digit+digit+"?"+digit+"?("+
|
|
|
471 |
groupSeparator+digit+digit+digit+")+)";
|
|
|
472 |
// digit++ is the possessive form which is necessary for reducing
|
|
|
473 |
// backtracking that would otherwise cause unacceptable performance
|
|
|
474 |
String numeral = "(("+ digit+"++)|"+groupedNumeral+")";
|
|
|
475 |
String javaStyleInteger = "([-+]?(" + numeral + "))";
|
|
|
476 |
String negativeInteger = negativePrefix + numeral + negativeSuffix;
|
|
|
477 |
String positiveInteger = positivePrefix + numeral + positiveSuffix;
|
|
|
478 |
return "("+ javaStyleInteger + ")|(" +
|
|
|
479 |
positiveInteger + ")|(" +
|
|
|
480 |
negativeInteger + ")";
|
|
|
481 |
}
|
|
|
482 |
private Pattern integerPattern() {
|
|
|
483 |
if (integerPattern == null) {
|
|
|
484 |
integerPattern = patternCache.forName(buildIntegerPatternString());
|
|
|
485 |
}
|
|
|
486 |
return integerPattern;
|
|
|
487 |
}
|
|
|
488 |
|
|
|
489 |
/**
|
|
|
490 |
* Fields and an accessor method to match line separators
|
|
|
491 |
*/
|
|
|
492 |
private static volatile Pattern separatorPattern;
|
|
|
493 |
private static volatile Pattern linePattern;
|
|
|
494 |
private static final String LINE_SEPARATOR_PATTERN =
|
|
|
495 |
"\r\n|[\n\r\u2028\u2029\u0085]";
|
|
|
496 |
private static final String LINE_PATTERN = ".*("+LINE_SEPARATOR_PATTERN+")|.+$";
|
|
|
497 |
|
|
|
498 |
private static Pattern separatorPattern() {
|
|
|
499 |
Pattern sp = separatorPattern;
|
|
|
500 |
if (sp == null)
|
|
|
501 |
separatorPattern = sp = Pattern.compile(LINE_SEPARATOR_PATTERN);
|
|
|
502 |
return sp;
|
|
|
503 |
}
|
|
|
504 |
|
|
|
505 |
private static Pattern linePattern() {
|
|
|
506 |
Pattern lp = linePattern;
|
|
|
507 |
if (lp == null)
|
|
|
508 |
linePattern = lp = Pattern.compile(LINE_PATTERN);
|
|
|
509 |
return lp;
|
|
|
510 |
}
|
|
|
511 |
|
|
|
512 |
/**
|
|
|
513 |
* Fields and methods to match floats and doubles
|
|
|
514 |
*/
|
|
|
515 |
private Pattern floatPattern;
|
|
|
516 |
private Pattern decimalPattern;
|
|
|
517 |
private void buildFloatAndDecimalPattern() {
|
|
|
518 |
// \\p{javaDigit} may not be perfect, see above
|
|
|
519 |
String digit = "([0-9]|(\\p{javaDigit}))";
|
|
|
520 |
String exponent = "([eE][+-]?"+digit+"+)?";
|
|
|
521 |
String groupedNumeral = "("+non0Digit+digit+"?"+digit+"?("+
|
|
|
522 |
groupSeparator+digit+digit+digit+")+)";
|
|
|
523 |
// Once again digit++ is used for performance, as above
|
|
|
524 |
String numeral = "(("+digit+"++)|"+groupedNumeral+")";
|
|
|
525 |
String decimalNumeral = "("+numeral+"|"+numeral +
|
|
|
526 |
decimalSeparator + digit + "*+|"+ decimalSeparator +
|
|
|
527 |
digit + "++)";
|
|
|
528 |
String nonNumber = "(NaN|"+nanString+"|Infinity|"+
|
|
|
529 |
infinityString+")";
|
|
|
530 |
String positiveFloat = "(" + positivePrefix + decimalNumeral +
|
|
|
531 |
positiveSuffix + exponent + ")";
|
|
|
532 |
String negativeFloat = "(" + negativePrefix + decimalNumeral +
|
|
|
533 |
negativeSuffix + exponent + ")";
|
|
|
534 |
String decimal = "(([-+]?" + decimalNumeral + exponent + ")|"+
|
|
|
535 |
positiveFloat + "|" + negativeFloat + ")";
|
|
|
536 |
String hexFloat =
|
|
|
537 |
"[-+]?0[xX][0-9a-fA-F]*\\.[0-9a-fA-F]+([pP][-+]?[0-9]+)?";
|
|
|
538 |
String positiveNonNumber = "(" + positivePrefix + nonNumber +
|
|
|
539 |
positiveSuffix + ")";
|
|
|
540 |
String negativeNonNumber = "(" + negativePrefix + nonNumber +
|
|
|
541 |
negativeSuffix + ")";
|
|
|
542 |
String signedNonNumber = "(([-+]?"+nonNumber+")|" +
|
|
|
543 |
positiveNonNumber + "|" +
|
|
|
544 |
negativeNonNumber + ")";
|
|
|
545 |
floatPattern = Pattern.compile(decimal + "|" + hexFloat + "|" +
|
|
|
546 |
signedNonNumber);
|
|
|
547 |
decimalPattern = Pattern.compile(decimal);
|
|
|
548 |
}
|
|
|
549 |
private Pattern floatPattern() {
|
|
|
550 |
if (floatPattern == null) {
|
|
|
551 |
buildFloatAndDecimalPattern();
|
|
|
552 |
}
|
|
|
553 |
return floatPattern;
|
|
|
554 |
}
|
|
|
555 |
private Pattern decimalPattern() {
|
|
|
556 |
if (decimalPattern == null) {
|
|
|
557 |
buildFloatAndDecimalPattern();
|
|
|
558 |
}
|
|
|
559 |
return decimalPattern;
|
|
|
560 |
}
|
|
|
561 |
|
|
|
562 |
// Constructors
|
|
|
563 |
|
|
|
564 |
/**
|
|
|
565 |
* Constructs a <code>Scanner</code> that returns values scanned
|
|
|
566 |
* from the specified source delimited by the specified pattern.
|
|
|
567 |
*
|
|
|
568 |
* @param source A character source implementing the Readable interface
|
|
|
569 |
* @param pattern A delimiting pattern
|
|
|
570 |
* @return A scanner with the specified source and pattern
|
|
|
571 |
*/
|
|
|
572 |
private Scanner(Readable source, Pattern pattern) {
|
|
|
573 |
if (source == null)
|
|
|
574 |
throw new NullPointerException("source");
|
|
|
575 |
if (pattern == null)
|
|
|
576 |
throw new NullPointerException("pattern");
|
|
|
577 |
this.source = source;
|
|
|
578 |
delimPattern = pattern;
|
|
|
579 |
buf = CharBuffer.allocate(BUFFER_SIZE);
|
|
|
580 |
buf.limit(0);
|
|
|
581 |
matcher = delimPattern.matcher(buf);
|
|
|
582 |
matcher.useTransparentBounds(true);
|
|
|
583 |
matcher.useAnchoringBounds(false);
|
|
|
584 |
useLocale(Locale.getDefault());
|
|
|
585 |
}
|
|
|
586 |
|
|
|
587 |
/**
|
|
|
588 |
* Constructs a new <code>Scanner</code> that produces values scanned
|
|
|
589 |
* from the specified source.
|
|
|
590 |
*
|
|
|
591 |
* @param source A character source implementing the {@link Readable}
|
|
|
592 |
* interface
|
|
|
593 |
*/
|
|
|
594 |
public Scanner(Readable source) {
|
|
|
595 |
this(source, WHITESPACE_PATTERN);
|
|
|
596 |
}
|
|
|
597 |
|
|
|
598 |
/**
|
|
|
599 |
* Constructs a new <code>Scanner</code> that produces values scanned
|
|
|
600 |
* from the specified input stream. Bytes from the stream are converted
|
|
|
601 |
* into characters using the underlying platform's
|
|
|
602 |
* {@linkplain java.nio.charset.Charset#defaultCharset() default charset}.
|
|
|
603 |
*
|
|
|
604 |
* @param source An input stream to be scanned
|
|
|
605 |
*/
|
|
|
606 |
public Scanner(InputStream source) {
|
|
|
607 |
this(new InputStreamReader(source), WHITESPACE_PATTERN);
|
|
|
608 |
}
|
|
|
609 |
|
|
|
610 |
/**
|
|
|
611 |
* Constructs a new <code>Scanner</code> that produces values scanned
|
|
|
612 |
* from the specified input stream. Bytes from the stream are converted
|
|
|
613 |
* into characters using the specified charset.
|
|
|
614 |
*
|
|
|
615 |
* @param source An input stream to be scanned
|
|
|
616 |
* @param charsetName The encoding type used to convert bytes from the
|
|
|
617 |
* stream into characters to be scanned
|
|
|
618 |
* @throws IllegalArgumentException if the specified character set
|
|
|
619 |
* does not exist
|
|
|
620 |
*/
|
|
|
621 |
public Scanner(InputStream source, String charsetName) {
|
|
|
622 |
this(makeReadable(source, charsetName), WHITESPACE_PATTERN);
|
|
|
623 |
}
|
|
|
624 |
|
|
|
625 |
private static Readable makeReadable(InputStream source,
|
|
|
626 |
String charsetName)
|
|
|
627 |
{
|
|
|
628 |
if (source == null)
|
|
|
629 |
throw new NullPointerException("source");
|
|
|
630 |
InputStreamReader isr = null;
|
|
|
631 |
try {
|
|
|
632 |
isr = new InputStreamReader(source, charsetName);
|
|
|
633 |
} catch (UnsupportedEncodingException uee) {
|
|
|
634 |
IllegalArgumentException iae = new IllegalArgumentException();
|
|
|
635 |
iae.initCause(uee);
|
|
|
636 |
throw iae;
|
|
|
637 |
}
|
|
|
638 |
return isr;
|
|
|
639 |
}
|
|
|
640 |
|
|
|
641 |
/**
|
|
|
642 |
* Constructs a new <code>Scanner</code> that produces values scanned
|
|
|
643 |
* from the specified file. Bytes from the file are converted into
|
|
|
644 |
* characters using the underlying platform's
|
|
|
645 |
* {@linkplain java.nio.charset.Charset#defaultCharset() default charset}.
|
|
|
646 |
*
|
|
|
647 |
* @param source A file to be scanned
|
|
|
648 |
* @throws FileNotFoundException if source is not found
|
|
|
649 |
*/
|
|
|
650 |
public Scanner(File source)
|
|
|
651 |
throws FileNotFoundException
|
|
|
652 |
{
|
|
|
653 |
this((ReadableByteChannel)(new FileInputStream(source).getChannel()));
|
|
|
654 |
}
|
|
|
655 |
|
|
|
656 |
/**
|
|
|
657 |
* Constructs a new <code>Scanner</code> that produces values scanned
|
|
|
658 |
* from the specified file. Bytes from the file are converted into
|
|
|
659 |
* characters using the specified charset.
|
|
|
660 |
*
|
|
|
661 |
* @param source A file to be scanned
|
|
|
662 |
* @param charsetName The encoding type used to convert bytes from the file
|
|
|
663 |
* into characters to be scanned
|
|
|
664 |
* @throws FileNotFoundException if source is not found
|
|
|
665 |
* @throws IllegalArgumentException if the specified encoding is
|
|
|
666 |
* not found
|
|
|
667 |
*/
|
|
|
668 |
public Scanner(File source, String charsetName)
|
|
|
669 |
throws FileNotFoundException
|
|
|
670 |
{
|
|
|
671 |
this((ReadableByteChannel)(new FileInputStream(source).getChannel()),
|
|
|
672 |
charsetName);
|
|
|
673 |
}
|
|
|
674 |
|
|
|
675 |
/**
|
|
|
676 |
* Constructs a new <code>Scanner</code> that produces values scanned
|
|
|
677 |
* from the specified string.
|
|
|
678 |
*
|
|
|
679 |
* @param source A string to scan
|
|
|
680 |
*/
|
|
|
681 |
public Scanner(String source) {
|
|
|
682 |
this(new StringReader(source), WHITESPACE_PATTERN);
|
|
|
683 |
}
|
|
|
684 |
|
|
|
685 |
/**
|
|
|
686 |
* Constructs a new <code>Scanner</code> that produces values scanned
|
|
|
687 |
* from the specified channel. Bytes from the source are converted into
|
|
|
688 |
* characters using the underlying platform's
|
|
|
689 |
* {@linkplain java.nio.charset.Charset#defaultCharset() default charset}.
|
|
|
690 |
*
|
|
|
691 |
* @param source A channel to scan
|
|
|
692 |
*/
|
|
|
693 |
public Scanner(ReadableByteChannel source) {
|
|
|
694 |
this(makeReadable(source), WHITESPACE_PATTERN);
|
|
|
695 |
}
|
|
|
696 |
|
|
|
697 |
private static Readable makeReadable(ReadableByteChannel source) {
|
|
|
698 |
if (source == null)
|
|
|
699 |
throw new NullPointerException("source");
|
|
|
700 |
String defaultCharsetName =
|
|
|
701 |
java.nio.charset.Charset.defaultCharset().name();
|
|
|
702 |
return Channels.newReader(source,
|
|
|
703 |
java.nio.charset.Charset.defaultCharset().name());
|
|
|
704 |
}
|
|
|
705 |
|
|
|
706 |
/**
|
|
|
707 |
* Constructs a new <code>Scanner</code> that produces values scanned
|
|
|
708 |
* from the specified channel. Bytes from the source are converted into
|
|
|
709 |
* characters using the specified charset.
|
|
|
710 |
*
|
|
|
711 |
* @param source A channel to scan
|
|
|
712 |
* @param charsetName The encoding type used to convert bytes from the
|
|
|
713 |
* channel into characters to be scanned
|
|
|
714 |
* @throws IllegalArgumentException if the specified character set
|
|
|
715 |
* does not exist
|
|
|
716 |
*/
|
|
|
717 |
public Scanner(ReadableByteChannel source, String charsetName) {
|
|
|
718 |
this(makeReadable(source, charsetName), WHITESPACE_PATTERN);
|
|
|
719 |
}
|
|
|
720 |
|
|
|
721 |
private static Readable makeReadable(ReadableByteChannel source,
|
|
|
722 |
String charsetName)
|
|
|
723 |
{
|
|
|
724 |
if (source == null)
|
|
|
725 |
throw new NullPointerException("source");
|
|
|
726 |
if (!Charset.isSupported(charsetName))
|
|
|
727 |
throw new IllegalArgumentException(charsetName);
|
|
|
728 |
return Channels.newReader(source, charsetName);
|
|
|
729 |
}
|
|
|
730 |
|
|
|
731 |
// Private primitives used to support scanning
|
|
|
732 |
|
|
|
733 |
private void saveState() {
|
|
|
734 |
savedScannerPosition = position;
|
|
|
735 |
}
|
|
|
736 |
|
|
|
737 |
private void revertState() {
|
|
|
738 |
this.position = savedScannerPosition;
|
|
|
739 |
savedScannerPosition = -1;
|
|
|
740 |
skipped = false;
|
|
|
741 |
}
|
|
|
742 |
|
|
|
743 |
private boolean revertState(boolean b) {
|
|
|
744 |
this.position = savedScannerPosition;
|
|
|
745 |
savedScannerPosition = -1;
|
|
|
746 |
skipped = false;
|
|
|
747 |
return b;
|
|
|
748 |
}
|
|
|
749 |
|
|
|
750 |
private void cacheResult() {
|
|
|
751 |
hasNextResult = matcher.group();
|
|
|
752 |
hasNextPosition = matcher.end();
|
|
|
753 |
hasNextPattern = matcher.pattern();
|
|
|
754 |
}
|
|
|
755 |
|
|
|
756 |
private void cacheResult(String result) {
|
|
|
757 |
hasNextResult = result;
|
|
|
758 |
hasNextPosition = matcher.end();
|
|
|
759 |
hasNextPattern = matcher.pattern();
|
|
|
760 |
}
|
|
|
761 |
|
|
|
762 |
// Clears both regular cache and type cache
|
|
|
763 |
private void clearCaches() {
|
|
|
764 |
hasNextPattern = null;
|
|
|
765 |
typeCache = null;
|
|
|
766 |
}
|
|
|
767 |
|
|
|
768 |
// Also clears both the regular cache and the type cache
|
|
|
769 |
private String getCachedResult() {
|
|
|
770 |
position = hasNextPosition;
|
|
|
771 |
hasNextPattern = null;
|
|
|
772 |
typeCache = null;
|
|
|
773 |
return hasNextResult;
|
|
|
774 |
}
|
|
|
775 |
|
|
|
776 |
// Also clears both the regular cache and the type cache
|
|
|
777 |
private void useTypeCache() {
|
|
|
778 |
if (closed)
|
|
|
779 |
throw new IllegalStateException("Scanner closed");
|
|
|
780 |
position = hasNextPosition;
|
|
|
781 |
hasNextPattern = null;
|
|
|
782 |
typeCache = null;
|
|
|
783 |
}
|
|
|
784 |
|
|
|
785 |
// Tries to read more input. May block.
|
|
|
786 |
private void readInput() {
|
|
|
787 |
if (buf.limit() == buf.capacity())
|
|
|
788 |
makeSpace();
|
|
|
789 |
|
|
|
790 |
// Prepare to receive data
|
|
|
791 |
int p = buf.position();
|
|
|
792 |
buf.position(buf.limit());
|
|
|
793 |
buf.limit(buf.capacity());
|
|
|
794 |
|
|
|
795 |
int n = 0;
|
|
|
796 |
try {
|
|
|
797 |
n = source.read(buf);
|
|
|
798 |
} catch (IOException ioe) {
|
|
|
799 |
lastException = ioe;
|
|
|
800 |
n = -1;
|
|
|
801 |
}
|
|
|
802 |
|
|
|
803 |
if (n == -1) {
|
|
|
804 |
sourceClosed = true;
|
|
|
805 |
needInput = false;
|
|
|
806 |
}
|
|
|
807 |
|
|
|
808 |
if (n > 0)
|
|
|
809 |
needInput = false;
|
|
|
810 |
|
|
|
811 |
// Restore current position and limit for reading
|
|
|
812 |
buf.limit(buf.position());
|
|
|
813 |
buf.position(p);
|
|
|
814 |
}
|
|
|
815 |
|
|
|
816 |
// After this method is called there will either be an exception
|
|
|
817 |
// or else there will be space in the buffer
|
|
|
818 |
private boolean makeSpace() {
|
|
|
819 |
clearCaches();
|
|
|
820 |
int offset = savedScannerPosition == -1 ?
|
|
|
821 |
position : savedScannerPosition;
|
|
|
822 |
buf.position(offset);
|
|
|
823 |
// Gain space by compacting buffer
|
|
|
824 |
if (offset > 0) {
|
|
|
825 |
buf.compact();
|
|
|
826 |
translateSavedIndexes(offset);
|
|
|
827 |
position -= offset;
|
|
|
828 |
buf.flip();
|
|
|
829 |
return true;
|
|
|
830 |
}
|
|
|
831 |
// Gain space by growing buffer
|
|
|
832 |
int newSize = buf.capacity() * 2;
|
|
|
833 |
CharBuffer newBuf = CharBuffer.allocate(newSize);
|
|
|
834 |
newBuf.put(buf);
|
|
|
835 |
newBuf.flip();
|
|
|
836 |
translateSavedIndexes(offset);
|
|
|
837 |
position -= offset;
|
|
|
838 |
buf = newBuf;
|
|
|
839 |
matcher.reset(buf);
|
|
|
840 |
return true;
|
|
|
841 |
}
|
|
|
842 |
|
|
|
843 |
// When a buffer compaction/reallocation occurs the saved indexes must
|
|
|
844 |
// be modified appropriately
|
|
|
845 |
private void translateSavedIndexes(int offset) {
|
|
|
846 |
if (savedScannerPosition != -1)
|
|
|
847 |
savedScannerPosition -= offset;
|
|
|
848 |
}
|
|
|
849 |
|
|
|
850 |
// If we are at the end of input then NoSuchElement;
|
|
|
851 |
// If there is still input left then InputMismatch
|
|
|
852 |
private void throwFor() {
|
|
|
853 |
skipped = false;
|
|
|
854 |
if ((sourceClosed) && (position == buf.limit()))
|
|
|
855 |
throw new NoSuchElementException();
|
|
|
856 |
else
|
|
|
857 |
throw new InputMismatchException();
|
|
|
858 |
}
|
|
|
859 |
|
|
|
860 |
// Returns true if a complete token or partial token is in the buffer.
|
|
|
861 |
// It is not necessary to find a complete token since a partial token
|
|
|
862 |
// means that there will be another token with or without more input.
|
|
|
863 |
private boolean hasTokenInBuffer() {
|
|
|
864 |
matchValid = false;
|
|
|
865 |
matcher.usePattern(delimPattern);
|
|
|
866 |
matcher.region(position, buf.limit());
|
|
|
867 |
|
|
|
868 |
// Skip delims first
|
|
|
869 |
if (matcher.lookingAt())
|
|
|
870 |
position = matcher.end();
|
|
|
871 |
|
|
|
872 |
// If we are sitting at the end, no more tokens in buffer
|
|
|
873 |
if (position == buf.limit())
|
|
|
874 |
return false;
|
|
|
875 |
|
|
|
876 |
return true;
|
|
|
877 |
}
|
|
|
878 |
|
|
|
879 |
/*
|
|
|
880 |
* Returns a "complete token" that matches the specified pattern
|
|
|
881 |
*
|
|
|
882 |
* A token is complete if surrounded by delims; a partial token
|
|
|
883 |
* is prefixed by delims but not postfixed by them
|
|
|
884 |
*
|
|
|
885 |
* The position is advanced to the end of that complete token
|
|
|
886 |
*
|
|
|
887 |
* Pattern == null means accept any token at all
|
|
|
888 |
*
|
|
|
889 |
* Triple return:
|
|
|
890 |
* 1. valid string means it was found
|
|
|
891 |
* 2. null with needInput=false means we won't ever find it
|
|
|
892 |
* 3. null with needInput=true means try again after readInput
|
|
|
893 |
*/
|
|
|
894 |
private String getCompleteTokenInBuffer(Pattern pattern) {
|
|
|
895 |
matchValid = false;
|
|
|
896 |
|
|
|
897 |
// Skip delims first
|
|
|
898 |
matcher.usePattern(delimPattern);
|
|
|
899 |
if (!skipped) { // Enforcing only one skip of leading delims
|
|
|
900 |
matcher.region(position, buf.limit());
|
|
|
901 |
if (matcher.lookingAt()) {
|
|
|
902 |
// If more input could extend the delimiters then we must wait
|
|
|
903 |
// for more input
|
|
|
904 |
if (matcher.hitEnd() && !sourceClosed) {
|
|
|
905 |
needInput = true;
|
|
|
906 |
return null;
|
|
|
907 |
}
|
|
|
908 |
// The delims were whole and the matcher should skip them
|
|
|
909 |
skipped = true;
|
|
|
910 |
position = matcher.end();
|
|
|
911 |
}
|
|
|
912 |
}
|
|
|
913 |
|
|
|
914 |
// If we are sitting at the end, no more tokens in buffer
|
|
|
915 |
if (position == buf.limit()) {
|
|
|
916 |
if (sourceClosed)
|
|
|
917 |
return null;
|
|
|
918 |
needInput = true;
|
|
|
919 |
return null;
|
|
|
920 |
}
|
|
|
921 |
|
|
|
922 |
// Must look for next delims. Simply attempting to match the
|
|
|
923 |
// pattern at this point may find a match but it might not be
|
|
|
924 |
// the first longest match because of missing input, or it might
|
|
|
925 |
// match a partial token instead of the whole thing.
|
|
|
926 |
|
|
|
927 |
// Then look for next delims
|
|
|
928 |
matcher.region(position, buf.limit());
|
|
|
929 |
boolean foundNextDelim = matcher.find();
|
|
|
930 |
if (foundNextDelim && (matcher.end() == position)) {
|
|
|
931 |
// Zero length delimiter match; we should find the next one
|
|
|
932 |
// using the automatic advance past a zero length match;
|
|
|
933 |
// Otherwise we have just found the same one we just skipped
|
|
|
934 |
foundNextDelim = matcher.find();
|
|
|
935 |
}
|
|
|
936 |
if (foundNextDelim) {
|
|
|
937 |
// In the rare case that more input could cause the match
|
|
|
938 |
// to be lost and there is more input coming we must wait
|
|
|
939 |
// for more input. Note that hitting the end is okay as long
|
|
|
940 |
// as the match cannot go away. It is the beginning of the
|
|
|
941 |
// next delims we want to be sure about, we don't care if
|
|
|
942 |
// they potentially extend further.
|
|
|
943 |
if (matcher.requireEnd() && !sourceClosed) {
|
|
|
944 |
needInput = true;
|
|
|
945 |
return null;
|
|
|
946 |
}
|
|
|
947 |
int tokenEnd = matcher.start();
|
|
|
948 |
// There is a complete token.
|
|
|
949 |
if (pattern == null) {
|
|
|
950 |
// Must continue with match to provide valid MatchResult
|
|
|
951 |
pattern = FIND_ANY_PATTERN;
|
|
|
952 |
}
|
|
|
953 |
// Attempt to match against the desired pattern
|
|
|
954 |
matcher.usePattern(pattern);
|
|
|
955 |
matcher.region(position, tokenEnd);
|
|
|
956 |
if (matcher.matches()) {
|
|
|
957 |
String s = matcher.group();
|
|
|
958 |
position = matcher.end();
|
|
|
959 |
return s;
|
|
|
960 |
} else { // Complete token but it does not match
|
|
|
961 |
return null;
|
|
|
962 |
}
|
|
|
963 |
}
|
|
|
964 |
|
|
|
965 |
// If we can't find the next delims but no more input is coming,
|
|
|
966 |
// then we can treat the remainder as a whole token
|
|
|
967 |
if (sourceClosed) {
|
|
|
968 |
if (pattern == null) {
|
|
|
969 |
// Must continue with match to provide valid MatchResult
|
|
|
970 |
pattern = FIND_ANY_PATTERN;
|
|
|
971 |
}
|
|
|
972 |
// Last token; Match the pattern here or throw
|
|
|
973 |
matcher.usePattern(pattern);
|
|
|
974 |
matcher.region(position, buf.limit());
|
|
|
975 |
if (matcher.matches()) {
|
|
|
976 |
String s = matcher.group();
|
|
|
977 |
position = matcher.end();
|
|
|
978 |
return s;
|
|
|
979 |
}
|
|
|
980 |
// Last piece does not match
|
|
|
981 |
return null;
|
|
|
982 |
}
|
|
|
983 |
|
|
|
984 |
// There is a partial token in the buffer; must read more
|
|
|
985 |
// to complete it
|
|
|
986 |
needInput = true;
|
|
|
987 |
return null;
|
|
|
988 |
}
|
|
|
989 |
|
|
|
990 |
// Finds the specified pattern in the buffer up to horizon.
|
|
|
991 |
// Returns a match for the specified input pattern.
|
|
|
992 |
private String findPatternInBuffer(Pattern pattern, int horizon) {
|
|
|
993 |
matchValid = false;
|
|
|
994 |
matcher.usePattern(pattern);
|
|
|
995 |
int bufferLimit = buf.limit();
|
|
|
996 |
int horizonLimit = -1;
|
|
|
997 |
int searchLimit = bufferLimit;
|
|
|
998 |
if (horizon > 0) {
|
|
|
999 |
horizonLimit = position + horizon;
|
|
|
1000 |
if (horizonLimit < bufferLimit)
|
|
|
1001 |
searchLimit = horizonLimit;
|
|
|
1002 |
}
|
|
|
1003 |
matcher.region(position, searchLimit);
|
|
|
1004 |
if (matcher.find()) {
|
|
|
1005 |
if (matcher.hitEnd() && (!sourceClosed)) {
|
|
|
1006 |
// The match may be longer if didn't hit horizon or real end
|
|
|
1007 |
if (searchLimit != horizonLimit) {
|
|
|
1008 |
// Hit an artificial end; try to extend the match
|
|
|
1009 |
needInput = true;
|
|
|
1010 |
return null;
|
|
|
1011 |
}
|
|
|
1012 |
// The match could go away depending on what is next
|
|
|
1013 |
if ((searchLimit == horizonLimit) && matcher.requireEnd()) {
|
|
|
1014 |
// Rare case: we hit the end of input and it happens
|
|
|
1015 |
// that it is at the horizon and the end of input is
|
|
|
1016 |
// required for the match.
|
|
|
1017 |
needInput = true;
|
|
|
1018 |
return null;
|
|
|
1019 |
}
|
|
|
1020 |
}
|
|
|
1021 |
// Did not hit end, or hit real end, or hit horizon
|
|
|
1022 |
position = matcher.end();
|
|
|
1023 |
return matcher.group();
|
|
|
1024 |
}
|
|
|
1025 |
|
|
|
1026 |
if (sourceClosed)
|
|
|
1027 |
return null;
|
|
|
1028 |
|
|
|
1029 |
// If there is no specified horizon, or if we have not searched
|
|
|
1030 |
// to the specified horizon yet, get more input
|
|
|
1031 |
if ((horizon == 0) || (searchLimit != horizonLimit))
|
|
|
1032 |
needInput = true;
|
|
|
1033 |
return null;
|
|
|
1034 |
}
|
|
|
1035 |
|
|
|
1036 |
// Returns a match for the specified input pattern anchored at
|
|
|
1037 |
// the current position
|
|
|
1038 |
private String matchPatternInBuffer(Pattern pattern) {
|
|
|
1039 |
matchValid = false;
|
|
|
1040 |
matcher.usePattern(pattern);
|
|
|
1041 |
matcher.region(position, buf.limit());
|
|
|
1042 |
if (matcher.lookingAt()) {
|
|
|
1043 |
if (matcher.hitEnd() && (!sourceClosed)) {
|
|
|
1044 |
// Get more input and try again
|
|
|
1045 |
needInput = true;
|
|
|
1046 |
return null;
|
|
|
1047 |
}
|
|
|
1048 |
position = matcher.end();
|
|
|
1049 |
return matcher.group();
|
|
|
1050 |
}
|
|
|
1051 |
|
|
|
1052 |
if (sourceClosed)
|
|
|
1053 |
return null;
|
|
|
1054 |
|
|
|
1055 |
// Read more to find pattern
|
|
|
1056 |
needInput = true;
|
|
|
1057 |
return null;
|
|
|
1058 |
}
|
|
|
1059 |
|
|
|
1060 |
// Throws if the scanner is closed
|
|
|
1061 |
private void ensureOpen() {
|
|
|
1062 |
if (closed)
|
|
|
1063 |
throw new IllegalStateException("Scanner closed");
|
|
|
1064 |
}
|
|
|
1065 |
|
|
|
1066 |
// Public methods
|
|
|
1067 |
|
|
|
1068 |
/**
|
|
|
1069 |
* Closes this scanner.
|
|
|
1070 |
*
|
|
|
1071 |
* <p> If this scanner has not yet been closed then if its underlying
|
|
|
1072 |
* {@linkplain java.lang.Readable readable} also implements the {@link
|
|
|
1073 |
* java.io.Closeable} interface then the readable's <tt>close</tt> method
|
|
|
1074 |
* will be invoked. If this scanner is already closed then invoking this
|
|
|
1075 |
* method will have no effect.
|
|
|
1076 |
*
|
|
|
1077 |
* <p>Attempting to perform search operations after a scanner has
|
|
|
1078 |
* been closed will result in an {@link IllegalStateException}.
|
|
|
1079 |
*
|
|
|
1080 |
*/
|
|
|
1081 |
public void close() {
|
|
|
1082 |
if (closed)
|
|
|
1083 |
return;
|
|
|
1084 |
if (source instanceof Closeable) {
|
|
|
1085 |
try {
|
|
|
1086 |
((Closeable)source).close();
|
|
|
1087 |
} catch (IOException ioe) {
|
|
|
1088 |
lastException = ioe;
|
|
|
1089 |
}
|
|
|
1090 |
}
|
|
|
1091 |
sourceClosed = true;
|
|
|
1092 |
source = null;
|
|
|
1093 |
closed = true;
|
|
|
1094 |
}
|
|
|
1095 |
|
|
|
1096 |
/**
|
|
|
1097 |
* Returns the <code>IOException</code> last thrown by this
|
|
|
1098 |
* <code>Scanner</code>'s underlying <code>Readable</code>. This method
|
|
|
1099 |
* returns <code>null</code> if no such exception exists.
|
|
|
1100 |
*
|
|
|
1101 |
* @return the last exception thrown by this scanner's readable
|
|
|
1102 |
*/
|
|
|
1103 |
public IOException ioException() {
|
|
|
1104 |
return lastException;
|
|
|
1105 |
}
|
|
|
1106 |
|
|
|
1107 |
/**
|
|
|
1108 |
* Returns the <code>Pattern</code> this <code>Scanner</code> is currently
|
|
|
1109 |
* using to match delimiters.
|
|
|
1110 |
*
|
|
|
1111 |
* @return this scanner's delimiting pattern.
|
|
|
1112 |
*/
|
|
|
1113 |
public Pattern delimiter() {
|
|
|
1114 |
return delimPattern;
|
|
|
1115 |
}
|
|
|
1116 |
|
|
|
1117 |
/**
|
|
|
1118 |
* Sets this scanner's delimiting pattern to the specified pattern.
|
|
|
1119 |
*
|
|
|
1120 |
* @param pattern A delimiting pattern
|
|
|
1121 |
* @return this scanner
|
|
|
1122 |
*/
|
|
|
1123 |
public Scanner useDelimiter(Pattern pattern) {
|
|
|
1124 |
delimPattern = pattern;
|
|
|
1125 |
return this;
|
|
|
1126 |
}
|
|
|
1127 |
|
|
|
1128 |
/**
|
|
|
1129 |
* Sets this scanner's delimiting pattern to a pattern constructed from
|
|
|
1130 |
* the specified <code>String</code>.
|
|
|
1131 |
*
|
|
|
1132 |
* <p> An invocation of this method of the form
|
|
|
1133 |
* <tt>useDelimiter(pattern)</tt> behaves in exactly the same way as the
|
|
|
1134 |
* invocation <tt>useDelimiter(Pattern.compile(pattern))</tt>.
|
|
|
1135 |
*
|
|
|
1136 |
* <p> Invoking the {@link #reset} method will set the scanner's delimiter
|
|
|
1137 |
* to the <a href= "#default-delimiter">default</a>.
|
|
|
1138 |
*
|
|
|
1139 |
* @param pattern A string specifying a delimiting pattern
|
|
|
1140 |
* @return this scanner
|
|
|
1141 |
*/
|
|
|
1142 |
public Scanner useDelimiter(String pattern) {
|
|
|
1143 |
delimPattern = patternCache.forName(pattern);
|
|
|
1144 |
return this;
|
|
|
1145 |
}
|
|
|
1146 |
|
|
|
1147 |
/**
|
|
|
1148 |
* Returns this scanner's locale.
|
|
|
1149 |
*
|
|
|
1150 |
* <p>A scanner's locale affects many elements of its default
|
|
|
1151 |
* primitive matching regular expressions; see
|
|
|
1152 |
* <a href= "#localized-numbers">localized numbers</a> above.
|
|
|
1153 |
*
|
|
|
1154 |
* @return this scanner's locale
|
|
|
1155 |
*/
|
|
|
1156 |
public Locale locale() {
|
|
|
1157 |
return this.locale;
|
|
|
1158 |
}
|
|
|
1159 |
|
|
|
1160 |
/**
|
|
|
1161 |
* Sets this scanner's locale to the specified locale.
|
|
|
1162 |
*
|
|
|
1163 |
* <p>A scanner's locale affects many elements of its default
|
|
|
1164 |
* primitive matching regular expressions; see
|
|
|
1165 |
* <a href= "#localized-numbers">localized numbers</a> above.
|
|
|
1166 |
*
|
|
|
1167 |
* <p>Invoking the {@link #reset} method will set the scanner's locale to
|
|
|
1168 |
* the <a href= "#initial-locale">initial locale</a>.
|
|
|
1169 |
*
|
|
|
1170 |
* @param locale A string specifying the locale to use
|
|
|
1171 |
* @return this scanner
|
|
|
1172 |
*/
|
|
|
1173 |
public Scanner useLocale(Locale locale) {
|
|
|
1174 |
if (locale.equals(this.locale))
|
|
|
1175 |
return this;
|
|
|
1176 |
|
|
|
1177 |
this.locale = locale;
|
|
|
1178 |
DecimalFormat df =
|
|
|
1179 |
(DecimalFormat)NumberFormat.getNumberInstance(locale);
|
|
|
1180 |
DecimalFormatSymbols dfs = DecimalFormatSymbols.getInstance(locale);
|
|
|
1181 |
|
|
|
1182 |
// These must be literalized to avoid collision with regex
|
|
|
1183 |
// metacharacters such as dot or parenthesis
|
|
|
1184 |
groupSeparator = "\\" + dfs.getGroupingSeparator();
|
|
|
1185 |
decimalSeparator = "\\" + dfs.getDecimalSeparator();
|
|
|
1186 |
|
|
|
1187 |
// Quoting the nonzero length locale-specific things
|
|
|
1188 |
// to avoid potential conflict with metacharacters
|
|
|
1189 |
nanString = "\\Q" + dfs.getNaN() + "\\E";
|
|
|
1190 |
infinityString = "\\Q" + dfs.getInfinity() + "\\E";
|
|
|
1191 |
positivePrefix = df.getPositivePrefix();
|
|
|
1192 |
if (positivePrefix.length() > 0)
|
|
|
1193 |
positivePrefix = "\\Q" + positivePrefix + "\\E";
|
|
|
1194 |
negativePrefix = df.getNegativePrefix();
|
|
|
1195 |
if (negativePrefix.length() > 0)
|
|
|
1196 |
negativePrefix = "\\Q" + negativePrefix + "\\E";
|
|
|
1197 |
positiveSuffix = df.getPositiveSuffix();
|
|
|
1198 |
if (positiveSuffix.length() > 0)
|
|
|
1199 |
positiveSuffix = "\\Q" + positiveSuffix + "\\E";
|
|
|
1200 |
negativeSuffix = df.getNegativeSuffix();
|
|
|
1201 |
if (negativeSuffix.length() > 0)
|
|
|
1202 |
negativeSuffix = "\\Q" + negativeSuffix + "\\E";
|
|
|
1203 |
|
|
|
1204 |
// Force rebuilding and recompilation of locale dependent
|
|
|
1205 |
// primitive patterns
|
|
|
1206 |
integerPattern = null;
|
|
|
1207 |
floatPattern = null;
|
|
|
1208 |
|
|
|
1209 |
return this;
|
|
|
1210 |
}
|
|
|
1211 |
|
|
|
1212 |
/**
|
|
|
1213 |
* Returns this scanner's default radix.
|
|
|
1214 |
*
|
|
|
1215 |
* <p>A scanner's radix affects elements of its default
|
|
|
1216 |
* number matching regular expressions; see
|
|
|
1217 |
* <a href= "#localized-numbers">localized numbers</a> above.
|
|
|
1218 |
*
|
|
|
1219 |
* @return the default radix of this scanner
|
|
|
1220 |
*/
|
|
|
1221 |
public int radix() {
|
|
|
1222 |
return this.defaultRadix;
|
|
|
1223 |
}
|
|
|
1224 |
|
|
|
1225 |
/**
|
|
|
1226 |
* Sets this scanner's default radix to the specified radix.
|
|
|
1227 |
*
|
|
|
1228 |
* <p>A scanner's radix affects elements of its default
|
|
|
1229 |
* number matching regular expressions; see
|
|
|
1230 |
* <a href= "#localized-numbers">localized numbers</a> above.
|
|
|
1231 |
*
|
|
|
1232 |
* <p>If the radix is less than <code>Character.MIN_RADIX</code>
|
|
|
1233 |
* or greater than <code>Character.MAX_RADIX</code>, then an
|
|
|
1234 |
* <code>IllegalArgumentException</code> is thrown.
|
|
|
1235 |
*
|
|
|
1236 |
* <p>Invoking the {@link #reset} method will set the scanner's radix to
|
|
|
1237 |
* <code>10</code>.
|
|
|
1238 |
*
|
|
|
1239 |
* @param radix The radix to use when scanning numbers
|
|
|
1240 |
* @return this scanner
|
|
|
1241 |
* @throws IllegalArgumentException if radix is out of range
|
|
|
1242 |
*/
|
|
|
1243 |
public Scanner useRadix(int radix) {
|
|
|
1244 |
if ((radix < Character.MIN_RADIX) || (radix > Character.MAX_RADIX))
|
|
|
1245 |
throw new IllegalArgumentException("radix:"+radix);
|
|
|
1246 |
|
|
|
1247 |
if (this.defaultRadix == radix)
|
|
|
1248 |
return this;
|
|
|
1249 |
this.defaultRadix = radix;
|
|
|
1250 |
// Force rebuilding and recompilation of radix dependent patterns
|
|
|
1251 |
integerPattern = null;
|
|
|
1252 |
return this;
|
|
|
1253 |
}
|
|
|
1254 |
|
|
|
1255 |
// The next operation should occur in the specified radix but
|
|
|
1256 |
// the default is left untouched.
|
|
|
1257 |
private void setRadix(int radix) {
|
|
|
1258 |
if (this.radix != radix) {
|
|
|
1259 |
// Force rebuilding and recompilation of radix dependent patterns
|
|
|
1260 |
integerPattern = null;
|
|
|
1261 |
this.radix = radix;
|
|
|
1262 |
}
|
|
|
1263 |
}
|
|
|
1264 |
|
|
|
1265 |
/**
|
|
|
1266 |
* Returns the match result of the last scanning operation performed
|
|
|
1267 |
* by this scanner. This method throws <code>IllegalStateException</code>
|
|
|
1268 |
* if no match has been performed, or if the last match was
|
|
|
1269 |
* not successful.
|
|
|
1270 |
*
|
|
|
1271 |
* <p>The various <code>next</code>methods of <code>Scanner</code>
|
|
|
1272 |
* make a match result available if they complete without throwing an
|
|
|
1273 |
* exception. For instance, after an invocation of the {@link #nextInt}
|
|
|
1274 |
* method that returned an int, this method returns a
|
|
|
1275 |
* <code>MatchResult</code> for the search of the
|
|
|
1276 |
* <a href="#Integer-regex"><i>Integer</i></a> regular expression
|
|
|
1277 |
* defined above. Similarly the {@link #findInLine},
|
|
|
1278 |
* {@link #findWithinHorizon}, and {@link #skip} methods will make a
|
|
|
1279 |
* match available if they succeed.
|
|
|
1280 |
*
|
|
|
1281 |
* @return a match result for the last match operation
|
|
|
1282 |
* @throws IllegalStateException If no match result is available
|
|
|
1283 |
*/
|
|
|
1284 |
public MatchResult match() {
|
|
|
1285 |
if (!matchValid)
|
|
|
1286 |
throw new IllegalStateException("No match result available");
|
|
|
1287 |
return matcher.toMatchResult();
|
|
|
1288 |
}
|
|
|
1289 |
|
|
|
1290 |
/**
|
|
|
1291 |
* <p>Returns the string representation of this <code>Scanner</code>. The
|
|
|
1292 |
* string representation of a <code>Scanner</code> contains information
|
|
|
1293 |
* that may be useful for debugging. The exact format is unspecified.
|
|
|
1294 |
*
|
|
|
1295 |
* @return The string representation of this scanner
|
|
|
1296 |
*/
|
|
|
1297 |
public String toString() {
|
|
|
1298 |
StringBuilder sb = new StringBuilder();
|
|
|
1299 |
sb.append("java.util.Scanner");
|
|
|
1300 |
sb.append("[delimiters=" + delimPattern + "]");
|
|
|
1301 |
sb.append("[position=" + position + "]");
|
|
|
1302 |
sb.append("[match valid=" + matchValid + "]");
|
|
|
1303 |
sb.append("[need input=" + needInput + "]");
|
|
|
1304 |
sb.append("[source closed=" + sourceClosed + "]");
|
|
|
1305 |
sb.append("[skipped=" + skipped + "]");
|
|
|
1306 |
sb.append("[group separator=" + groupSeparator + "]");
|
|
|
1307 |
sb.append("[decimal separator=" + decimalSeparator + "]");
|
|
|
1308 |
sb.append("[positive prefix=" + positivePrefix + "]");
|
|
|
1309 |
sb.append("[negative prefix=" + negativePrefix + "]");
|
|
|
1310 |
sb.append("[positive suffix=" + positiveSuffix + "]");
|
|
|
1311 |
sb.append("[negative suffix=" + negativeSuffix + "]");
|
|
|
1312 |
sb.append("[NaN string=" + nanString + "]");
|
|
|
1313 |
sb.append("[infinity string=" + infinityString + "]");
|
|
|
1314 |
return sb.toString();
|
|
|
1315 |
}
|
|
|
1316 |
|
|
|
1317 |
/**
|
|
|
1318 |
* Returns true if this scanner has another token in its input.
|
|
|
1319 |
* This method may block while waiting for input to scan.
|
|
|
1320 |
* The scanner does not advance past any input.
|
|
|
1321 |
*
|
|
|
1322 |
* @return true if and only if this scanner has another token
|
|
|
1323 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1324 |
* @see java.util.Iterator
|
|
|
1325 |
*/
|
|
|
1326 |
public boolean hasNext() {
|
|
|
1327 |
ensureOpen();
|
|
|
1328 |
saveState();
|
|
|
1329 |
while (!sourceClosed) {
|
|
|
1330 |
if (hasTokenInBuffer())
|
|
|
1331 |
return revertState(true);
|
|
|
1332 |
readInput();
|
|
|
1333 |
}
|
|
|
1334 |
boolean result = hasTokenInBuffer();
|
|
|
1335 |
return revertState(result);
|
|
|
1336 |
}
|
|
|
1337 |
|
|
|
1338 |
/**
|
|
|
1339 |
* Finds and returns the next complete token from this scanner.
|
|
|
1340 |
* A complete token is preceded and followed by input that matches
|
|
|
1341 |
* the delimiter pattern. This method may block while waiting for input
|
|
|
1342 |
* to scan, even if a previous invocation of {@link #hasNext} returned
|
|
|
1343 |
* <code>true</code>.
|
|
|
1344 |
*
|
|
|
1345 |
* @return the next token
|
|
|
1346 |
* @throws NoSuchElementException if no more tokens are available
|
|
|
1347 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1348 |
* @see java.util.Iterator
|
|
|
1349 |
*/
|
|
|
1350 |
public String next() {
|
|
|
1351 |
ensureOpen();
|
|
|
1352 |
clearCaches();
|
|
|
1353 |
|
|
|
1354 |
while (true) {
|
|
|
1355 |
String token = getCompleteTokenInBuffer(null);
|
|
|
1356 |
if (token != null) {
|
|
|
1357 |
matchValid = true;
|
|
|
1358 |
skipped = false;
|
|
|
1359 |
return token;
|
|
|
1360 |
}
|
|
|
1361 |
if (needInput)
|
|
|
1362 |
readInput();
|
|
|
1363 |
else
|
|
|
1364 |
throwFor();
|
|
|
1365 |
}
|
|
|
1366 |
}
|
|
|
1367 |
|
|
|
1368 |
/**
|
|
|
1369 |
* The remove operation is not supported by this implementation of
|
|
|
1370 |
* <code>Iterator</code>.
|
|
|
1371 |
*
|
|
|
1372 |
* @throws UnsupportedOperationException if this method is invoked.
|
|
|
1373 |
* @see java.util.Iterator
|
|
|
1374 |
*/
|
|
|
1375 |
public void remove() {
|
|
|
1376 |
throw new UnsupportedOperationException();
|
|
|
1377 |
}
|
|
|
1378 |
|
|
|
1379 |
/**
|
|
|
1380 |
* Returns true if the next token matches the pattern constructed from the
|
|
|
1381 |
* specified string. The scanner does not advance past any input.
|
|
|
1382 |
*
|
|
|
1383 |
* <p> An invocation of this method of the form <tt>hasNext(pattern)</tt>
|
|
|
1384 |
* behaves in exactly the same way as the invocation
|
|
|
1385 |
* <tt>hasNext(Pattern.compile(pattern))</tt>.
|
|
|
1386 |
*
|
|
|
1387 |
* @param pattern a string specifying the pattern to scan
|
|
|
1388 |
* @return true if and only if this scanner has another token matching
|
|
|
1389 |
* the specified pattern
|
|
|
1390 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1391 |
*/
|
|
|
1392 |
public boolean hasNext(String pattern) {
|
|
|
1393 |
return hasNext(patternCache.forName(pattern));
|
|
|
1394 |
}
|
|
|
1395 |
|
|
|
1396 |
/**
|
|
|
1397 |
* Returns the next token if it matches the pattern constructed from the
|
|
|
1398 |
* specified string. If the match is successful, the scanner advances
|
|
|
1399 |
* past the input that matched the pattern.
|
|
|
1400 |
*
|
|
|
1401 |
* <p> An invocation of this method of the form <tt>next(pattern)</tt>
|
|
|
1402 |
* behaves in exactly the same way as the invocation
|
|
|
1403 |
* <tt>next(Pattern.compile(pattern))</tt>.
|
|
|
1404 |
*
|
|
|
1405 |
* @param pattern a string specifying the pattern to scan
|
|
|
1406 |
* @return the next token
|
|
|
1407 |
* @throws NoSuchElementException if no such tokens are available
|
|
|
1408 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1409 |
*/
|
|
|
1410 |
public String next(String pattern) {
|
|
|
1411 |
return next(patternCache.forName(pattern));
|
|
|
1412 |
}
|
|
|
1413 |
|
|
|
1414 |
/**
|
|
|
1415 |
* Returns true if the next complete token matches the specified pattern.
|
|
|
1416 |
* A complete token is prefixed and postfixed by input that matches
|
|
|
1417 |
* the delimiter pattern. This method may block while waiting for input.
|
|
|
1418 |
* The scanner does not advance past any input.
|
|
|
1419 |
*
|
|
|
1420 |
* @param pattern the pattern to scan for
|
|
|
1421 |
* @return true if and only if this scanner has another token matching
|
|
|
1422 |
* the specified pattern
|
|
|
1423 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1424 |
*/
|
|
|
1425 |
public boolean hasNext(Pattern pattern) {
|
|
|
1426 |
ensureOpen();
|
|
|
1427 |
if (pattern == null)
|
|
|
1428 |
throw new NullPointerException();
|
|
|
1429 |
hasNextPattern = null;
|
|
|
1430 |
saveState();
|
|
|
1431 |
|
|
|
1432 |
while (true) {
|
|
|
1433 |
if (getCompleteTokenInBuffer(pattern) != null) {
|
|
|
1434 |
matchValid = true;
|
|
|
1435 |
cacheResult();
|
|
|
1436 |
return revertState(true);
|
|
|
1437 |
}
|
|
|
1438 |
if (needInput)
|
|
|
1439 |
readInput();
|
|
|
1440 |
else
|
|
|
1441 |
return revertState(false);
|
|
|
1442 |
}
|
|
|
1443 |
}
|
|
|
1444 |
|
|
|
1445 |
/**
|
|
|
1446 |
* Returns the next token if it matches the specified pattern. This
|
|
|
1447 |
* method may block while waiting for input to scan, even if a previous
|
|
|
1448 |
* invocation of {@link #hasNext(Pattern)} returned <code>true</code>.
|
|
|
1449 |
* If the match is successful, the scanner advances past the input that
|
|
|
1450 |
* matched the pattern.
|
|
|
1451 |
*
|
|
|
1452 |
* @param pattern the pattern to scan for
|
|
|
1453 |
* @return the next token
|
|
|
1454 |
* @throws NoSuchElementException if no more tokens are available
|
|
|
1455 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1456 |
*/
|
|
|
1457 |
public String next(Pattern pattern) {
|
|
|
1458 |
ensureOpen();
|
|
|
1459 |
if (pattern == null)
|
|
|
1460 |
throw new NullPointerException();
|
|
|
1461 |
|
|
|
1462 |
// Did we already find this pattern?
|
|
|
1463 |
if (hasNextPattern == pattern)
|
|
|
1464 |
return getCachedResult();
|
|
|
1465 |
clearCaches();
|
|
|
1466 |
|
|
|
1467 |
// Search for the pattern
|
|
|
1468 |
while (true) {
|
|
|
1469 |
String token = getCompleteTokenInBuffer(pattern);
|
|
|
1470 |
if (token != null) {
|
|
|
1471 |
matchValid = true;
|
|
|
1472 |
skipped = false;
|
|
|
1473 |
return token;
|
|
|
1474 |
}
|
|
|
1475 |
if (needInput)
|
|
|
1476 |
readInput();
|
|
|
1477 |
else
|
|
|
1478 |
throwFor();
|
|
|
1479 |
}
|
|
|
1480 |
}
|
|
|
1481 |
|
|
|
1482 |
/**
|
|
|
1483 |
* Returns true if there is another line in the input of this scanner.
|
|
|
1484 |
* This method may block while waiting for input. The scanner does not
|
|
|
1485 |
* advance past any input.
|
|
|
1486 |
*
|
|
|
1487 |
* @return true if and only if this scanner has another line of input
|
|
|
1488 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1489 |
*/
|
|
|
1490 |
public boolean hasNextLine() {
|
|
|
1491 |
saveState();
|
|
|
1492 |
|
|
|
1493 |
String result = findWithinHorizon(linePattern(), 0);
|
|
|
1494 |
if (result != null) {
|
|
|
1495 |
MatchResult mr = this.match();
|
|
|
1496 |
String lineSep = mr.group(1);
|
|
|
1497 |
if (lineSep != null) {
|
|
|
1498 |
result = result.substring(0, result.length() -
|
|
|
1499 |
lineSep.length());
|
|
|
1500 |
cacheResult(result);
|
|
|
1501 |
|
|
|
1502 |
} else {
|
|
|
1503 |
cacheResult();
|
|
|
1504 |
}
|
|
|
1505 |
}
|
|
|
1506 |
revertState();
|
|
|
1507 |
return (result != null);
|
|
|
1508 |
}
|
|
|
1509 |
|
|
|
1510 |
/**
|
|
|
1511 |
* Advances this scanner past the current line and returns the input
|
|
|
1512 |
* that was skipped.
|
|
|
1513 |
*
|
|
|
1514 |
* This method returns the rest of the current line, excluding any line
|
|
|
1515 |
* separator at the end. The position is set to the beginning of the next
|
|
|
1516 |
* line.
|
|
|
1517 |
*
|
|
|
1518 |
* <p>Since this method continues to search through the input looking
|
|
|
1519 |
* for a line separator, it may buffer all of the input searching for
|
|
|
1520 |
* the line to skip if no line separators are present.
|
|
|
1521 |
*
|
|
|
1522 |
* @return the line that was skipped
|
|
|
1523 |
* @throws NoSuchElementException if no line was found
|
|
|
1524 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1525 |
*/
|
|
|
1526 |
public String nextLine() {
|
|
|
1527 |
if (hasNextPattern == linePattern())
|
|
|
1528 |
return getCachedResult();
|
|
|
1529 |
clearCaches();
|
|
|
1530 |
|
|
|
1531 |
String result = findWithinHorizon(linePattern, 0);
|
|
|
1532 |
if (result == null)
|
|
|
1533 |
throw new NoSuchElementException("No line found");
|
|
|
1534 |
MatchResult mr = this.match();
|
|
|
1535 |
String lineSep = mr.group(1);
|
|
|
1536 |
if (lineSep != null)
|
|
|
1537 |
result = result.substring(0, result.length() - lineSep.length());
|
|
|
1538 |
if (result == null)
|
|
|
1539 |
throw new NoSuchElementException();
|
|
|
1540 |
else
|
|
|
1541 |
return result;
|
|
|
1542 |
}
|
|
|
1543 |
|
|
|
1544 |
// Public methods that ignore delimiters
|
|
|
1545 |
|
|
|
1546 |
/**
|
|
|
1547 |
* Attempts to find the next occurrence of a pattern constructed from the
|
|
|
1548 |
* specified string, ignoring delimiters.
|
|
|
1549 |
*
|
|
|
1550 |
* <p>An invocation of this method of the form <tt>findInLine(pattern)</tt>
|
|
|
1551 |
* behaves in exactly the same way as the invocation
|
|
|
1552 |
* <tt>findInLine(Pattern.compile(pattern))</tt>.
|
|
|
1553 |
*
|
|
|
1554 |
* @param pattern a string specifying the pattern to search for
|
|
|
1555 |
* @return the text that matched the specified pattern
|
|
|
1556 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1557 |
*/
|
|
|
1558 |
public String findInLine(String pattern) {
|
|
|
1559 |
return findInLine(patternCache.forName(pattern));
|
|
|
1560 |
}
|
|
|
1561 |
|
|
|
1562 |
/**
|
|
|
1563 |
* Attempts to find the next occurrence of the specified pattern ignoring
|
|
|
1564 |
* delimiters. If the pattern is found before the next line separator, the
|
|
|
1565 |
* scanner advances past the input that matched and returns the string that
|
|
|
1566 |
* matched the pattern.
|
|
|
1567 |
* If no such pattern is detected in the input up to the next line
|
|
|
1568 |
* separator, then <code>null</code> is returned and the scanner's
|
|
|
1569 |
* position is unchanged. This method may block waiting for input that
|
|
|
1570 |
* matches the pattern.
|
|
|
1571 |
*
|
|
|
1572 |
* <p>Since this method continues to search through the input looking
|
|
|
1573 |
* for the specified pattern, it may buffer all of the input searching for
|
|
|
1574 |
* the desired token if no line separators are present.
|
|
|
1575 |
*
|
|
|
1576 |
* @param pattern the pattern to scan for
|
|
|
1577 |
* @return the text that matched the specified pattern
|
|
|
1578 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1579 |
*/
|
|
|
1580 |
public String findInLine(Pattern pattern) {
|
|
|
1581 |
ensureOpen();
|
|
|
1582 |
if (pattern == null)
|
|
|
1583 |
throw new NullPointerException();
|
|
|
1584 |
clearCaches();
|
|
|
1585 |
// Expand buffer to include the next newline or end of input
|
|
|
1586 |
int endPosition = 0;
|
|
|
1587 |
saveState();
|
|
|
1588 |
while (true) {
|
|
|
1589 |
String token = findPatternInBuffer(separatorPattern(), 0);
|
|
|
1590 |
if (token != null) {
|
|
|
1591 |
endPosition = matcher.start();
|
|
|
1592 |
break; // up to next newline
|
|
|
1593 |
}
|
|
|
1594 |
if (needInput) {
|
|
|
1595 |
readInput();
|
|
|
1596 |
} else {
|
|
|
1597 |
endPosition = buf.limit();
|
|
|
1598 |
break; // up to end of input
|
|
|
1599 |
}
|
|
|
1600 |
}
|
|
|
1601 |
revertState();
|
|
|
1602 |
int horizonForLine = endPosition - position;
|
|
|
1603 |
// If there is nothing between the current pos and the next
|
|
|
1604 |
// newline simply return null, invoking findWithinHorizon
|
|
|
1605 |
// with "horizon=0" will scan beyond the line bound.
|
|
|
1606 |
if (horizonForLine == 0)
|
|
|
1607 |
return null;
|
|
|
1608 |
// Search for the pattern
|
|
|
1609 |
return findWithinHorizon(pattern, horizonForLine);
|
|
|
1610 |
}
|
|
|
1611 |
|
|
|
1612 |
/**
|
|
|
1613 |
* Attempts to find the next occurrence of a pattern constructed from the
|
|
|
1614 |
* specified string, ignoring delimiters.
|
|
|
1615 |
*
|
|
|
1616 |
* <p>An invocation of this method of the form
|
|
|
1617 |
* <tt>findWithinHorizon(pattern)</tt> behaves in exactly the same way as
|
|
|
1618 |
* the invocation
|
|
|
1619 |
* <tt>findWithinHorizon(Pattern.compile(pattern, horizon))</tt>.
|
|
|
1620 |
*
|
|
|
1621 |
* @param pattern a string specifying the pattern to search for
|
|
|
1622 |
* @return the text that matched the specified pattern
|
|
|
1623 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1624 |
* @throws IllegalArgumentException if horizon is negative
|
|
|
1625 |
*/
|
|
|
1626 |
public String findWithinHorizon(String pattern, int horizon) {
|
|
|
1627 |
return findWithinHorizon(patternCache.forName(pattern), horizon);
|
|
|
1628 |
}
|
|
|
1629 |
|
|
|
1630 |
/**
|
|
|
1631 |
* Attempts to find the next occurrence of the specified pattern.
|
|
|
1632 |
*
|
|
|
1633 |
* <p>This method searches through the input up to the specified
|
|
|
1634 |
* search horizon, ignoring delimiters. If the pattern is found the
|
|
|
1635 |
* scanner advances past the input that matched and returns the string
|
|
|
1636 |
* that matched the pattern. If no such pattern is detected then the
|
|
|
1637 |
* null is returned and the scanner's position remains unchanged. This
|
|
|
1638 |
* method may block waiting for input that matches the pattern.
|
|
|
1639 |
*
|
|
|
1640 |
* <p>A scanner will never search more than <code>horizon</code> code
|
|
|
1641 |
* points beyond its current position. Note that a match may be clipped
|
|
|
1642 |
* by the horizon; that is, an arbitrary match result may have been
|
|
|
1643 |
* different if the horizon had been larger. The scanner treats the
|
|
|
1644 |
* horizon as a transparent, non-anchoring bound (see {@link
|
|
|
1645 |
* Matcher#useTransparentBounds} and {@link Matcher#useAnchoringBounds}).
|
|
|
1646 |
*
|
|
|
1647 |
* <p>If horizon is <code>0</code>, then the horizon is ignored and
|
|
|
1648 |
* this method continues to search through the input looking for the
|
|
|
1649 |
* specified pattern without bound. In this case it may buffer all of
|
|
|
1650 |
* the input searching for the pattern.
|
|
|
1651 |
*
|
|
|
1652 |
* <p>If horizon is negative, then an IllegalArgumentException is
|
|
|
1653 |
* thrown.
|
|
|
1654 |
*
|
|
|
1655 |
* @param pattern the pattern to scan for
|
|
|
1656 |
* @return the text that matched the specified pattern
|
|
|
1657 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1658 |
* @throws IllegalArgumentException if horizon is negative
|
|
|
1659 |
*/
|
|
|
1660 |
public String findWithinHorizon(Pattern pattern, int horizon) {
|
|
|
1661 |
ensureOpen();
|
|
|
1662 |
if (pattern == null)
|
|
|
1663 |
throw new NullPointerException();
|
|
|
1664 |
if (horizon < 0)
|
|
|
1665 |
throw new IllegalArgumentException("horizon < 0");
|
|
|
1666 |
clearCaches();
|
|
|
1667 |
|
|
|
1668 |
// Search for the pattern
|
|
|
1669 |
while (true) {
|
|
|
1670 |
String token = findPatternInBuffer(pattern, horizon);
|
|
|
1671 |
if (token != null) {
|
|
|
1672 |
matchValid = true;
|
|
|
1673 |
return token;
|
|
|
1674 |
}
|
|
|
1675 |
if (needInput)
|
|
|
1676 |
readInput();
|
|
|
1677 |
else
|
|
|
1678 |
break; // up to end of input
|
|
|
1679 |
}
|
|
|
1680 |
return null;
|
|
|
1681 |
}
|
|
|
1682 |
|
|
|
1683 |
/**
|
|
|
1684 |
* Skips input that matches the specified pattern, ignoring delimiters.
|
|
|
1685 |
* This method will skip input if an anchored match of the specified
|
|
|
1686 |
* pattern succeeds.
|
|
|
1687 |
*
|
|
|
1688 |
* <p>If a match to the specified pattern is not found at the
|
|
|
1689 |
* current position, then no input is skipped and a
|
|
|
1690 |
* <tt>NoSuchElementException</tt> is thrown.
|
|
|
1691 |
*
|
|
|
1692 |
* <p>Since this method seeks to match the specified pattern starting at
|
|
|
1693 |
* the scanner's current position, patterns that can match a lot of
|
|
|
1694 |
* input (".*", for example) may cause the scanner to buffer a large
|
|
|
1695 |
* amount of input.
|
|
|
1696 |
*
|
|
|
1697 |
* <p>Note that it is possible to skip something without risking a
|
|
|
1698 |
* <code>NoSuchElementException</code> by using a pattern that can
|
|
|
1699 |
* match nothing, e.g., <code>sc.skip("[ \t]*")</code>.
|
|
|
1700 |
*
|
|
|
1701 |
* @param pattern a string specifying the pattern to skip over
|
|
|
1702 |
* @return this scanner
|
|
|
1703 |
* @throws NoSuchElementException if the specified pattern is not found
|
|
|
1704 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1705 |
*/
|
|
|
1706 |
public Scanner skip(Pattern pattern) {
|
|
|
1707 |
ensureOpen();
|
|
|
1708 |
if (pattern == null)
|
|
|
1709 |
throw new NullPointerException();
|
|
|
1710 |
clearCaches();
|
|
|
1711 |
|
|
|
1712 |
// Search for the pattern
|
|
|
1713 |
while (true) {
|
|
|
1714 |
String token = matchPatternInBuffer(pattern);
|
|
|
1715 |
if (token != null) {
|
|
|
1716 |
matchValid = true;
|
|
|
1717 |
position = matcher.end();
|
|
|
1718 |
return this;
|
|
|
1719 |
}
|
|
|
1720 |
if (needInput)
|
|
|
1721 |
readInput();
|
|
|
1722 |
else
|
|
|
1723 |
throw new NoSuchElementException();
|
|
|
1724 |
}
|
|
|
1725 |
}
|
|
|
1726 |
|
|
|
1727 |
/**
|
|
|
1728 |
* Skips input that matches a pattern constructed from the specified
|
|
|
1729 |
* string.
|
|
|
1730 |
*
|
|
|
1731 |
* <p> An invocation of this method of the form <tt>skip(pattern)</tt>
|
|
|
1732 |
* behaves in exactly the same way as the invocation
|
|
|
1733 |
* <tt>skip(Pattern.compile(pattern))</tt>.
|
|
|
1734 |
*
|
|
|
1735 |
* @param pattern a string specifying the pattern to skip over
|
|
|
1736 |
* @return this scanner
|
|
|
1737 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1738 |
*/
|
|
|
1739 |
public Scanner skip(String pattern) {
|
|
|
1740 |
return skip(patternCache.forName(pattern));
|
|
|
1741 |
}
|
|
|
1742 |
|
|
|
1743 |
// Convenience methods for scanning primitives
|
|
|
1744 |
|
|
|
1745 |
/**
|
|
|
1746 |
* Returns true if the next token in this scanner's input can be
|
|
|
1747 |
* interpreted as a boolean value using a case insensitive pattern
|
|
|
1748 |
* created from the string "true|false". The scanner does not
|
|
|
1749 |
* advance past the input that matched.
|
|
|
1750 |
*
|
|
|
1751 |
* @return true if and only if this scanner's next token is a valid
|
|
|
1752 |
* boolean value
|
|
|
1753 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1754 |
*/
|
|
|
1755 |
public boolean hasNextBoolean() {
|
|
|
1756 |
return hasNext(boolPattern());
|
|
|
1757 |
}
|
|
|
1758 |
|
|
|
1759 |
/**
|
|
|
1760 |
* Scans the next token of the input into a boolean value and returns
|
|
|
1761 |
* that value. This method will throw <code>InputMismatchException</code>
|
|
|
1762 |
* if the next token cannot be translated into a valid boolean value.
|
|
|
1763 |
* If the match is successful, the scanner advances past the input that
|
|
|
1764 |
* matched.
|
|
|
1765 |
*
|
|
|
1766 |
* @return the boolean scanned from the input
|
|
|
1767 |
* @throws InputMismatchException if the next token is not a valid boolean
|
|
|
1768 |
* @throws NoSuchElementException if input is exhausted
|
|
|
1769 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1770 |
*/
|
|
|
1771 |
public boolean nextBoolean() {
|
|
|
1772 |
clearCaches();
|
|
|
1773 |
return Boolean.parseBoolean(next(boolPattern()));
|
|
|
1774 |
}
|
|
|
1775 |
|
|
|
1776 |
/**
|
|
|
1777 |
* Returns true if the next token in this scanner's input can be
|
|
|
1778 |
* interpreted as a byte value in the default radix using the
|
|
|
1779 |
* {@link #nextByte} method. The scanner does not advance past any input.
|
|
|
1780 |
*
|
|
|
1781 |
* @return true if and only if this scanner's next token is a valid
|
|
|
1782 |
* byte value
|
|
|
1783 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1784 |
*/
|
|
|
1785 |
public boolean hasNextByte() {
|
|
|
1786 |
return hasNextByte(defaultRadix);
|
|
|
1787 |
}
|
|
|
1788 |
|
|
|
1789 |
/**
|
|
|
1790 |
* Returns true if the next token in this scanner's input can be
|
|
|
1791 |
* interpreted as a byte value in the specified radix using the
|
|
|
1792 |
* {@link #nextByte} method. The scanner does not advance past any input.
|
|
|
1793 |
*
|
|
|
1794 |
* @param radix the radix used to interpret the token as a byte value
|
|
|
1795 |
* @return true if and only if this scanner's next token is a valid
|
|
|
1796 |
* byte value
|
|
|
1797 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1798 |
*/
|
|
|
1799 |
public boolean hasNextByte(int radix) {
|
|
|
1800 |
setRadix(radix);
|
|
|
1801 |
boolean result = hasNext(integerPattern());
|
|
|
1802 |
if (result) { // Cache it
|
|
|
1803 |
try {
|
|
|
1804 |
String s = (matcher.group(SIMPLE_GROUP_INDEX) == null) ?
|
|
|
1805 |
processIntegerToken(hasNextResult) :
|
|
|
1806 |
hasNextResult;
|
|
|
1807 |
typeCache = Byte.parseByte(s, radix);
|
|
|
1808 |
} catch (NumberFormatException nfe) {
|
|
|
1809 |
result = false;
|
|
|
1810 |
}
|
|
|
1811 |
}
|
|
|
1812 |
return result;
|
|
|
1813 |
}
|
|
|
1814 |
|
|
|
1815 |
/**
|
|
|
1816 |
* Scans the next token of the input as a <tt>byte</tt>.
|
|
|
1817 |
*
|
|
|
1818 |
* <p> An invocation of this method of the form
|
|
|
1819 |
* <tt>nextByte()</tt> behaves in exactly the same way as the
|
|
|
1820 |
* invocation <tt>nextByte(radix)</tt>, where <code>radix</code>
|
|
|
1821 |
* is the default radix of this scanner.
|
|
|
1822 |
*
|
|
|
1823 |
* @return the <tt>byte</tt> scanned from the input
|
|
|
1824 |
* @throws InputMismatchException
|
|
|
1825 |
* if the next token does not match the <i>Integer</i>
|
|
|
1826 |
* regular expression, or is out of range
|
|
|
1827 |
* @throws NoSuchElementException if input is exhausted
|
|
|
1828 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1829 |
*/
|
|
|
1830 |
public byte nextByte() {
|
|
|
1831 |
return nextByte(defaultRadix);
|
|
|
1832 |
}
|
|
|
1833 |
|
|
|
1834 |
/**
|
|
|
1835 |
* Scans the next token of the input as a <tt>byte</tt>.
|
|
|
1836 |
* This method will throw <code>InputMismatchException</code>
|
|
|
1837 |
* if the next token cannot be translated into a valid byte value as
|
|
|
1838 |
* described below. If the translation is successful, the scanner advances
|
|
|
1839 |
* past the input that matched.
|
|
|
1840 |
*
|
|
|
1841 |
* <p> If the next token matches the <a
|
|
|
1842 |
* href="#Integer-regex"><i>Integer</i></a> regular expression defined
|
|
|
1843 |
* above then the token is converted into a <tt>byte</tt> value as if by
|
|
|
1844 |
* removing all locale specific prefixes, group separators, and locale
|
|
|
1845 |
* specific suffixes, then mapping non-ASCII digits into ASCII
|
|
|
1846 |
* digits via {@link Character#digit Character.digit}, prepending a
|
|
|
1847 |
* negative sign (-) if the locale specific negative prefixes and suffixes
|
|
|
1848 |
* were present, and passing the resulting string to
|
|
|
1849 |
* {@link Byte#parseByte(String, int) Byte.parseByte} with the
|
|
|
1850 |
* specified radix.
|
|
|
1851 |
*
|
|
|
1852 |
* @param radix the radix used to interpret the token as a byte value
|
|
|
1853 |
* @return the <tt>byte</tt> scanned from the input
|
|
|
1854 |
* @throws InputMismatchException
|
|
|
1855 |
* if the next token does not match the <i>Integer</i>
|
|
|
1856 |
* regular expression, or is out of range
|
|
|
1857 |
* @throws NoSuchElementException if input is exhausted
|
|
|
1858 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1859 |
*/
|
|
|
1860 |
public byte nextByte(int radix) {
|
|
|
1861 |
// Check cached result
|
|
|
1862 |
if ((typeCache != null) && (typeCache instanceof Byte)
|
|
|
1863 |
&& this.radix == radix) {
|
|
|
1864 |
byte val = ((Byte)typeCache).byteValue();
|
|
|
1865 |
useTypeCache();
|
|
|
1866 |
return val;
|
|
|
1867 |
}
|
|
|
1868 |
setRadix(radix);
|
|
|
1869 |
clearCaches();
|
|
|
1870 |
// Search for next byte
|
|
|
1871 |
try {
|
|
|
1872 |
String s = next(integerPattern());
|
|
|
1873 |
if (matcher.group(SIMPLE_GROUP_INDEX) == null)
|
|
|
1874 |
s = processIntegerToken(s);
|
|
|
1875 |
return Byte.parseByte(s, radix);
|
|
|
1876 |
} catch (NumberFormatException nfe) {
|
|
|
1877 |
position = matcher.start(); // don't skip bad token
|
|
|
1878 |
throw new InputMismatchException(nfe.getMessage());
|
|
|
1879 |
}
|
|
|
1880 |
}
|
|
|
1881 |
|
|
|
1882 |
/**
|
|
|
1883 |
* Returns true if the next token in this scanner's input can be
|
|
|
1884 |
* interpreted as a short value in the default radix using the
|
|
|
1885 |
* {@link #nextShort} method. The scanner does not advance past any input.
|
|
|
1886 |
*
|
|
|
1887 |
* @return true if and only if this scanner's next token is a valid
|
|
|
1888 |
* short value in the default radix
|
|
|
1889 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1890 |
*/
|
|
|
1891 |
public boolean hasNextShort() {
|
|
|
1892 |
return hasNextShort(defaultRadix);
|
|
|
1893 |
}
|
|
|
1894 |
|
|
|
1895 |
/**
|
|
|
1896 |
* Returns true if the next token in this scanner's input can be
|
|
|
1897 |
* interpreted as a short value in the specified radix using the
|
|
|
1898 |
* {@link #nextShort} method. The scanner does not advance past any input.
|
|
|
1899 |
*
|
|
|
1900 |
* @param radix the radix used to interpret the token as a short value
|
|
|
1901 |
* @return true if and only if this scanner's next token is a valid
|
|
|
1902 |
* short value in the specified radix
|
|
|
1903 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1904 |
*/
|
|
|
1905 |
public boolean hasNextShort(int radix) {
|
|
|
1906 |
setRadix(radix);
|
|
|
1907 |
boolean result = hasNext(integerPattern());
|
|
|
1908 |
if (result) { // Cache it
|
|
|
1909 |
try {
|
|
|
1910 |
String s = (matcher.group(SIMPLE_GROUP_INDEX) == null) ?
|
|
|
1911 |
processIntegerToken(hasNextResult) :
|
|
|
1912 |
hasNextResult;
|
|
|
1913 |
typeCache = Short.parseShort(s, radix);
|
|
|
1914 |
} catch (NumberFormatException nfe) {
|
|
|
1915 |
result = false;
|
|
|
1916 |
}
|
|
|
1917 |
}
|
|
|
1918 |
return result;
|
|
|
1919 |
}
|
|
|
1920 |
|
|
|
1921 |
/**
|
|
|
1922 |
* Scans the next token of the input as a <tt>short</tt>.
|
|
|
1923 |
*
|
|
|
1924 |
* <p> An invocation of this method of the form
|
|
|
1925 |
* <tt>nextShort()</tt> behaves in exactly the same way as the
|
|
|
1926 |
* invocation <tt>nextShort(radix)</tt>, where <code>radix</code>
|
|
|
1927 |
* is the default radix of this scanner.
|
|
|
1928 |
*
|
|
|
1929 |
* @return the <tt>short</tt> scanned from the input
|
|
|
1930 |
* @throws InputMismatchException
|
|
|
1931 |
* if the next token does not match the <i>Integer</i>
|
|
|
1932 |
* regular expression, or is out of range
|
|
|
1933 |
* @throws NoSuchElementException if input is exhausted
|
|
|
1934 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1935 |
*/
|
|
|
1936 |
public short nextShort() {
|
|
|
1937 |
return nextShort(defaultRadix);
|
|
|
1938 |
}
|
|
|
1939 |
|
|
|
1940 |
/**
|
|
|
1941 |
* Scans the next token of the input as a <tt>short</tt>.
|
|
|
1942 |
* This method will throw <code>InputMismatchException</code>
|
|
|
1943 |
* if the next token cannot be translated into a valid short value as
|
|
|
1944 |
* described below. If the translation is successful, the scanner advances
|
|
|
1945 |
* past the input that matched.
|
|
|
1946 |
*
|
|
|
1947 |
* <p> If the next token matches the <a
|
|
|
1948 |
* href="#Integer-regex"><i>Integer</i></a> regular expression defined
|
|
|
1949 |
* above then the token is converted into a <tt>short</tt> value as if by
|
|
|
1950 |
* removing all locale specific prefixes, group separators, and locale
|
|
|
1951 |
* specific suffixes, then mapping non-ASCII digits into ASCII
|
|
|
1952 |
* digits via {@link Character#digit Character.digit}, prepending a
|
|
|
1953 |
* negative sign (-) if the locale specific negative prefixes and suffixes
|
|
|
1954 |
* were present, and passing the resulting string to
|
|
|
1955 |
* {@link Short#parseShort(String, int) Short.parseShort} with the
|
|
|
1956 |
* specified radix.
|
|
|
1957 |
*
|
|
|
1958 |
* @param radix the radix used to interpret the token as a short value
|
|
|
1959 |
* @return the <tt>short</tt> scanned from the input
|
|
|
1960 |
* @throws InputMismatchException
|
|
|
1961 |
* if the next token does not match the <i>Integer</i>
|
|
|
1962 |
* regular expression, or is out of range
|
|
|
1963 |
* @throws NoSuchElementException if input is exhausted
|
|
|
1964 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1965 |
*/
|
|
|
1966 |
public short nextShort(int radix) {
|
|
|
1967 |
// Check cached result
|
|
|
1968 |
if ((typeCache != null) && (typeCache instanceof Short)
|
|
|
1969 |
&& this.radix == radix) {
|
|
|
1970 |
short val = ((Short)typeCache).shortValue();
|
|
|
1971 |
useTypeCache();
|
|
|
1972 |
return val;
|
|
|
1973 |
}
|
|
|
1974 |
setRadix(radix);
|
|
|
1975 |
clearCaches();
|
|
|
1976 |
// Search for next short
|
|
|
1977 |
try {
|
|
|
1978 |
String s = next(integerPattern());
|
|
|
1979 |
if (matcher.group(SIMPLE_GROUP_INDEX) == null)
|
|
|
1980 |
s = processIntegerToken(s);
|
|
|
1981 |
return Short.parseShort(s, radix);
|
|
|
1982 |
} catch (NumberFormatException nfe) {
|
|
|
1983 |
position = matcher.start(); // don't skip bad token
|
|
|
1984 |
throw new InputMismatchException(nfe.getMessage());
|
|
|
1985 |
}
|
|
|
1986 |
}
|
|
|
1987 |
|
|
|
1988 |
/**
|
|
|
1989 |
* Returns true if the next token in this scanner's input can be
|
|
|
1990 |
* interpreted as an int value in the default radix using the
|
|
|
1991 |
* {@link #nextInt} method. The scanner does not advance past any input.
|
|
|
1992 |
*
|
|
|
1993 |
* @return true if and only if this scanner's next token is a valid
|
|
|
1994 |
* int value
|
|
|
1995 |
* @throws IllegalStateException if this scanner is closed
|
|
|
1996 |
*/
|
|
|
1997 |
public boolean hasNextInt() {
|
|
|
1998 |
return hasNextInt(defaultRadix);
|
|
|
1999 |
}
|
|
|
2000 |
|
|
|
2001 |
/**
|
|
|
2002 |
* Returns true if the next token in this scanner's input can be
|
|
|
2003 |
* interpreted as an int value in the specified radix using the
|
|
|
2004 |
* {@link #nextInt} method. The scanner does not advance past any input.
|
|
|
2005 |
*
|
|
|
2006 |
* @param radix the radix used to interpret the token as an int value
|
|
|
2007 |
* @return true if and only if this scanner's next token is a valid
|
|
|
2008 |
* int value
|
|
|
2009 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2010 |
*/
|
|
|
2011 |
public boolean hasNextInt(int radix) {
|
|
|
2012 |
setRadix(radix);
|
|
|
2013 |
boolean result = hasNext(integerPattern());
|
|
|
2014 |
if (result) { // Cache it
|
|
|
2015 |
try {
|
|
|
2016 |
String s = (matcher.group(SIMPLE_GROUP_INDEX) == null) ?
|
|
|
2017 |
processIntegerToken(hasNextResult) :
|
|
|
2018 |
hasNextResult;
|
|
|
2019 |
typeCache = Integer.parseInt(s, radix);
|
|
|
2020 |
} catch (NumberFormatException nfe) {
|
|
|
2021 |
result = false;
|
|
|
2022 |
}
|
|
|
2023 |
}
|
|
|
2024 |
return result;
|
|
|
2025 |
}
|
|
|
2026 |
|
|
|
2027 |
/**
|
|
|
2028 |
* The integer token must be stripped of prefixes, group separators,
|
|
|
2029 |
* and suffixes, non ascii digits must be converted into ascii digits
|
|
|
2030 |
* before parse will accept it.
|
|
|
2031 |
*/
|
|
|
2032 |
private String processIntegerToken(String token) {
|
|
|
2033 |
String result = token.replaceAll(""+groupSeparator, "");
|
|
|
2034 |
boolean isNegative = false;
|
|
|
2035 |
int preLen = negativePrefix.length();
|
|
|
2036 |
if ((preLen > 0) && result.startsWith(negativePrefix)) {
|
|
|
2037 |
isNegative = true;
|
|
|
2038 |
result = result.substring(preLen);
|
|
|
2039 |
}
|
|
|
2040 |
int sufLen = negativeSuffix.length();
|
|
|
2041 |
if ((sufLen > 0) && result.endsWith(negativeSuffix)) {
|
|
|
2042 |
isNegative = true;
|
|
|
2043 |
result = result.substring(result.length() - sufLen,
|
|
|
2044 |
result.length());
|
|
|
2045 |
}
|
|
|
2046 |
if (isNegative)
|
|
|
2047 |
result = "-" + result;
|
|
|
2048 |
return result;
|
|
|
2049 |
}
|
|
|
2050 |
|
|
|
2051 |
/**
|
|
|
2052 |
* Scans the next token of the input as an <tt>int</tt>.
|
|
|
2053 |
*
|
|
|
2054 |
* <p> An invocation of this method of the form
|
|
|
2055 |
* <tt>nextInt()</tt> behaves in exactly the same way as the
|
|
|
2056 |
* invocation <tt>nextInt(radix)</tt>, where <code>radix</code>
|
|
|
2057 |
* is the default radix of this scanner.
|
|
|
2058 |
*
|
|
|
2059 |
* @return the <tt>int</tt> scanned from the input
|
|
|
2060 |
* @throws InputMismatchException
|
|
|
2061 |
* if the next token does not match the <i>Integer</i>
|
|
|
2062 |
* regular expression, or is out of range
|
|
|
2063 |
* @throws NoSuchElementException if input is exhausted
|
|
|
2064 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2065 |
*/
|
|
|
2066 |
public int nextInt() {
|
|
|
2067 |
return nextInt(defaultRadix);
|
|
|
2068 |
}
|
|
|
2069 |
|
|
|
2070 |
/**
|
|
|
2071 |
* Scans the next token of the input as an <tt>int</tt>.
|
|
|
2072 |
* This method will throw <code>InputMismatchException</code>
|
|
|
2073 |
* if the next token cannot be translated into a valid int value as
|
|
|
2074 |
* described below. If the translation is successful, the scanner advances
|
|
|
2075 |
* past the input that matched.
|
|
|
2076 |
*
|
|
|
2077 |
* <p> If the next token matches the <a
|
|
|
2078 |
* href="#Integer-regex"><i>Integer</i></a> regular expression defined
|
|
|
2079 |
* above then the token is converted into an <tt>int</tt> value as if by
|
|
|
2080 |
* removing all locale specific prefixes, group separators, and locale
|
|
|
2081 |
* specific suffixes, then mapping non-ASCII digits into ASCII
|
|
|
2082 |
* digits via {@link Character#digit Character.digit}, prepending a
|
|
|
2083 |
* negative sign (-) if the locale specific negative prefixes and suffixes
|
|
|
2084 |
* were present, and passing the resulting string to
|
|
|
2085 |
* {@link Integer#parseInt(String, int) Integer.parseInt} with the
|
|
|
2086 |
* specified radix.
|
|
|
2087 |
*
|
|
|
2088 |
* @param radix the radix used to interpret the token as an int value
|
|
|
2089 |
* @return the <tt>int</tt> scanned from the input
|
|
|
2090 |
* @throws InputMismatchException
|
|
|
2091 |
* if the next token does not match the <i>Integer</i>
|
|
|
2092 |
* regular expression, or is out of range
|
|
|
2093 |
* @throws NoSuchElementException if input is exhausted
|
|
|
2094 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2095 |
*/
|
|
|
2096 |
public int nextInt(int radix) {
|
|
|
2097 |
// Check cached result
|
|
|
2098 |
if ((typeCache != null) && (typeCache instanceof Integer)
|
|
|
2099 |
&& this.radix == radix) {
|
|
|
2100 |
int val = ((Integer)typeCache).intValue();
|
|
|
2101 |
useTypeCache();
|
|
|
2102 |
return val;
|
|
|
2103 |
}
|
|
|
2104 |
setRadix(radix);
|
|
|
2105 |
clearCaches();
|
|
|
2106 |
// Search for next int
|
|
|
2107 |
try {
|
|
|
2108 |
String s = next(integerPattern());
|
|
|
2109 |
if (matcher.group(SIMPLE_GROUP_INDEX) == null)
|
|
|
2110 |
s = processIntegerToken(s);
|
|
|
2111 |
return Integer.parseInt(s, radix);
|
|
|
2112 |
} catch (NumberFormatException nfe) {
|
|
|
2113 |
position = matcher.start(); // don't skip bad token
|
|
|
2114 |
throw new InputMismatchException(nfe.getMessage());
|
|
|
2115 |
}
|
|
|
2116 |
}
|
|
|
2117 |
|
|
|
2118 |
/**
|
|
|
2119 |
* Returns true if the next token in this scanner's input can be
|
|
|
2120 |
* interpreted as a long value in the default radix using the
|
|
|
2121 |
* {@link #nextLong} method. The scanner does not advance past any input.
|
|
|
2122 |
*
|
|
|
2123 |
* @return true if and only if this scanner's next token is a valid
|
|
|
2124 |
* long value
|
|
|
2125 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2126 |
*/
|
|
|
2127 |
public boolean hasNextLong() {
|
|
|
2128 |
return hasNextLong(defaultRadix);
|
|
|
2129 |
}
|
|
|
2130 |
|
|
|
2131 |
/**
|
|
|
2132 |
* Returns true if the next token in this scanner's input can be
|
|
|
2133 |
* interpreted as a long value in the specified radix using the
|
|
|
2134 |
* {@link #nextLong} method. The scanner does not advance past any input.
|
|
|
2135 |
*
|
|
|
2136 |
* @param radix the radix used to interpret the token as a long value
|
|
|
2137 |
* @return true if and only if this scanner's next token is a valid
|
|
|
2138 |
* long value
|
|
|
2139 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2140 |
*/
|
|
|
2141 |
public boolean hasNextLong(int radix) {
|
|
|
2142 |
setRadix(radix);
|
|
|
2143 |
boolean result = hasNext(integerPattern());
|
|
|
2144 |
if (result) { // Cache it
|
|
|
2145 |
try {
|
|
|
2146 |
String s = (matcher.group(SIMPLE_GROUP_INDEX) == null) ?
|
|
|
2147 |
processIntegerToken(hasNextResult) :
|
|
|
2148 |
hasNextResult;
|
|
|
2149 |
typeCache = Long.parseLong(s, radix);
|
|
|
2150 |
} catch (NumberFormatException nfe) {
|
|
|
2151 |
result = false;
|
|
|
2152 |
}
|
|
|
2153 |
}
|
|
|
2154 |
return result;
|
|
|
2155 |
}
|
|
|
2156 |
|
|
|
2157 |
/**
|
|
|
2158 |
* Scans the next token of the input as a <tt>long</tt>.
|
|
|
2159 |
*
|
|
|
2160 |
* <p> An invocation of this method of the form
|
|
|
2161 |
* <tt>nextLong()</tt> behaves in exactly the same way as the
|
|
|
2162 |
* invocation <tt>nextLong(radix)</tt>, where <code>radix</code>
|
|
|
2163 |
* is the default radix of this scanner.
|
|
|
2164 |
*
|
|
|
2165 |
* @return the <tt>long</tt> scanned from the input
|
|
|
2166 |
* @throws InputMismatchException
|
|
|
2167 |
* if the next token does not match the <i>Integer</i>
|
|
|
2168 |
* regular expression, or is out of range
|
|
|
2169 |
* @throws NoSuchElementException if input is exhausted
|
|
|
2170 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2171 |
*/
|
|
|
2172 |
public long nextLong() {
|
|
|
2173 |
return nextLong(defaultRadix);
|
|
|
2174 |
}
|
|
|
2175 |
|
|
|
2176 |
/**
|
|
|
2177 |
* Scans the next token of the input as a <tt>long</tt>.
|
|
|
2178 |
* This method will throw <code>InputMismatchException</code>
|
|
|
2179 |
* if the next token cannot be translated into a valid long value as
|
|
|
2180 |
* described below. If the translation is successful, the scanner advances
|
|
|
2181 |
* past the input that matched.
|
|
|
2182 |
*
|
|
|
2183 |
* <p> If the next token matches the <a
|
|
|
2184 |
* href="#Integer-regex"><i>Integer</i></a> regular expression defined
|
|
|
2185 |
* above then the token is converted into a <tt>long</tt> value as if by
|
|
|
2186 |
* removing all locale specific prefixes, group separators, and locale
|
|
|
2187 |
* specific suffixes, then mapping non-ASCII digits into ASCII
|
|
|
2188 |
* digits via {@link Character#digit Character.digit}, prepending a
|
|
|
2189 |
* negative sign (-) if the locale specific negative prefixes and suffixes
|
|
|
2190 |
* were present, and passing the resulting string to
|
|
|
2191 |
* {@link Long#parseLong(String, int) Long.parseLong} with the
|
|
|
2192 |
* specified radix.
|
|
|
2193 |
*
|
|
|
2194 |
* @param radix the radix used to interpret the token as an int value
|
|
|
2195 |
* @return the <tt>long</tt> scanned from the input
|
|
|
2196 |
* @throws InputMismatchException
|
|
|
2197 |
* if the next token does not match the <i>Integer</i>
|
|
|
2198 |
* regular expression, or is out of range
|
|
|
2199 |
* @throws NoSuchElementException if input is exhausted
|
|
|
2200 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2201 |
*/
|
|
|
2202 |
public long nextLong(int radix) {
|
|
|
2203 |
// Check cached result
|
|
|
2204 |
if ((typeCache != null) && (typeCache instanceof Long)
|
|
|
2205 |
&& this.radix == radix) {
|
|
|
2206 |
long val = ((Long)typeCache).longValue();
|
|
|
2207 |
useTypeCache();
|
|
|
2208 |
return val;
|
|
|
2209 |
}
|
|
|
2210 |
setRadix(radix);
|
|
|
2211 |
clearCaches();
|
|
|
2212 |
try {
|
|
|
2213 |
String s = next(integerPattern());
|
|
|
2214 |
if (matcher.group(SIMPLE_GROUP_INDEX) == null)
|
|
|
2215 |
s = processIntegerToken(s);
|
|
|
2216 |
return Long.parseLong(s, radix);
|
|
|
2217 |
} catch (NumberFormatException nfe) {
|
|
|
2218 |
position = matcher.start(); // don't skip bad token
|
|
|
2219 |
throw new InputMismatchException(nfe.getMessage());
|
|
|
2220 |
}
|
|
|
2221 |
}
|
|
|
2222 |
|
|
|
2223 |
/**
|
|
|
2224 |
* The float token must be stripped of prefixes, group separators,
|
|
|
2225 |
* and suffixes, non ascii digits must be converted into ascii digits
|
|
|
2226 |
* before parseFloat will accept it.
|
|
|
2227 |
*
|
|
|
2228 |
* If there are non-ascii digits in the token these digits must
|
|
|
2229 |
* be processed before the token is passed to parseFloat.
|
|
|
2230 |
*/
|
|
|
2231 |
private String processFloatToken(String token) {
|
|
|
2232 |
String result = token.replaceAll(groupSeparator, "");
|
|
|
2233 |
if (!decimalSeparator.equals("\\."))
|
|
|
2234 |
result = result.replaceAll(decimalSeparator, ".");
|
|
|
2235 |
boolean isNegative = false;
|
|
|
2236 |
int preLen = negativePrefix.length();
|
|
|
2237 |
if ((preLen > 0) && result.startsWith(negativePrefix)) {
|
|
|
2238 |
isNegative = true;
|
|
|
2239 |
result = result.substring(preLen);
|
|
|
2240 |
}
|
|
|
2241 |
int sufLen = negativeSuffix.length();
|
|
|
2242 |
if ((sufLen > 0) && result.endsWith(negativeSuffix)) {
|
|
|
2243 |
isNegative = true;
|
|
|
2244 |
result = result.substring(result.length() - sufLen,
|
|
|
2245 |
result.length());
|
|
|
2246 |
}
|
|
|
2247 |
if (result.equals(nanString))
|
|
|
2248 |
result = "NaN";
|
|
|
2249 |
if (result.equals(infinityString))
|
|
|
2250 |
result = "Infinity";
|
|
|
2251 |
if (isNegative)
|
|
|
2252 |
result = "-" + result;
|
|
|
2253 |
|
|
|
2254 |
// Translate non-ASCII digits
|
|
|
2255 |
Matcher m = NON_ASCII_DIGIT.matcher(result);
|
|
|
2256 |
if (m.find()) {
|
|
|
2257 |
StringBuilder inASCII = new StringBuilder();
|
|
|
2258 |
for (int i=0; i<result.length(); i++) {
|
|
|
2259 |
char nextChar = result.charAt(i);
|
|
|
2260 |
if (Character.isDigit(nextChar)) {
|
|
|
2261 |
int d = Character.digit(nextChar, 10);
|
|
|
2262 |
if (d != -1)
|
|
|
2263 |
inASCII.append(d);
|
|
|
2264 |
else
|
|
|
2265 |
inASCII.append(nextChar);
|
|
|
2266 |
} else {
|
|
|
2267 |
inASCII.append(nextChar);
|
|
|
2268 |
}
|
|
|
2269 |
}
|
|
|
2270 |
result = inASCII.toString();
|
|
|
2271 |
}
|
|
|
2272 |
|
|
|
2273 |
return result;
|
|
|
2274 |
}
|
|
|
2275 |
|
|
|
2276 |
/**
|
|
|
2277 |
* Returns true if the next token in this scanner's input can be
|
|
|
2278 |
* interpreted as a float value using the {@link #nextFloat}
|
|
|
2279 |
* method. The scanner does not advance past any input.
|
|
|
2280 |
*
|
|
|
2281 |
* @return true if and only if this scanner's next token is a valid
|
|
|
2282 |
* float value
|
|
|
2283 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2284 |
*/
|
|
|
2285 |
public boolean hasNextFloat() {
|
|
|
2286 |
setRadix(10);
|
|
|
2287 |
boolean result = hasNext(floatPattern());
|
|
|
2288 |
if (result) { // Cache it
|
|
|
2289 |
try {
|
|
|
2290 |
String s = processFloatToken(hasNextResult);
|
|
|
2291 |
typeCache = Float.valueOf(Float.parseFloat(s));
|
|
|
2292 |
} catch (NumberFormatException nfe) {
|
|
|
2293 |
result = false;
|
|
|
2294 |
}
|
|
|
2295 |
}
|
|
|
2296 |
return result;
|
|
|
2297 |
}
|
|
|
2298 |
|
|
|
2299 |
/**
|
|
|
2300 |
* Scans the next token of the input as a <tt>float</tt>.
|
|
|
2301 |
* This method will throw <code>InputMismatchException</code>
|
|
|
2302 |
* if the next token cannot be translated into a valid float value as
|
|
|
2303 |
* described below. If the translation is successful, the scanner advances
|
|
|
2304 |
* past the input that matched.
|
|
|
2305 |
*
|
|
|
2306 |
* <p> If the next token matches the <a
|
|
|
2307 |
* href="#Float-regex"><i>Float</i></a> regular expression defined above
|
|
|
2308 |
* then the token is converted into a <tt>float</tt> value as if by
|
|
|
2309 |
* removing all locale specific prefixes, group separators, and locale
|
|
|
2310 |
* specific suffixes, then mapping non-ASCII digits into ASCII
|
|
|
2311 |
* digits via {@link Character#digit Character.digit}, prepending a
|
|
|
2312 |
* negative sign (-) if the locale specific negative prefixes and suffixes
|
|
|
2313 |
* were present, and passing the resulting string to
|
|
|
2314 |
* {@link Float#parseFloat Float.parseFloat}. If the token matches
|
|
|
2315 |
* the localized NaN or infinity strings, then either "Nan" or "Infinity"
|
|
|
2316 |
* is passed to {@link Float#parseFloat(String) Float.parseFloat} as
|
|
|
2317 |
* appropriate.
|
|
|
2318 |
*
|
|
|
2319 |
* @return the <tt>float</tt> scanned from the input
|
|
|
2320 |
* @throws InputMismatchException
|
|
|
2321 |
* if the next token does not match the <i>Float</i>
|
|
|
2322 |
* regular expression, or is out of range
|
|
|
2323 |
* @throws NoSuchElementException if input is exhausted
|
|
|
2324 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2325 |
*/
|
|
|
2326 |
public float nextFloat() {
|
|
|
2327 |
// Check cached result
|
|
|
2328 |
if ((typeCache != null) && (typeCache instanceof Float)) {
|
|
|
2329 |
float val = ((Float)typeCache).floatValue();
|
|
|
2330 |
useTypeCache();
|
|
|
2331 |
return val;
|
|
|
2332 |
}
|
|
|
2333 |
setRadix(10);
|
|
|
2334 |
clearCaches();
|
|
|
2335 |
try {
|
|
|
2336 |
return Float.parseFloat(processFloatToken(next(floatPattern())));
|
|
|
2337 |
} catch (NumberFormatException nfe) {
|
|
|
2338 |
position = matcher.start(); // don't skip bad token
|
|
|
2339 |
throw new InputMismatchException(nfe.getMessage());
|
|
|
2340 |
}
|
|
|
2341 |
}
|
|
|
2342 |
|
|
|
2343 |
/**
|
|
|
2344 |
* Returns true if the next token in this scanner's input can be
|
|
|
2345 |
* interpreted as a double value using the {@link #nextDouble}
|
|
|
2346 |
* method. The scanner does not advance past any input.
|
|
|
2347 |
*
|
|
|
2348 |
* @return true if and only if this scanner's next token is a valid
|
|
|
2349 |
* double value
|
|
|
2350 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2351 |
*/
|
|
|
2352 |
public boolean hasNextDouble() {
|
|
|
2353 |
setRadix(10);
|
|
|
2354 |
boolean result = hasNext(floatPattern());
|
|
|
2355 |
if (result) { // Cache it
|
|
|
2356 |
try {
|
|
|
2357 |
String s = processFloatToken(hasNextResult);
|
|
|
2358 |
typeCache = Double.valueOf(Double.parseDouble(s));
|
|
|
2359 |
} catch (NumberFormatException nfe) {
|
|
|
2360 |
result = false;
|
|
|
2361 |
}
|
|
|
2362 |
}
|
|
|
2363 |
return result;
|
|
|
2364 |
}
|
|
|
2365 |
|
|
|
2366 |
/**
|
|
|
2367 |
* Scans the next token of the input as a <tt>double</tt>.
|
|
|
2368 |
* This method will throw <code>InputMismatchException</code>
|
|
|
2369 |
* if the next token cannot be translated into a valid double value.
|
|
|
2370 |
* If the translation is successful, the scanner advances past the input
|
|
|
2371 |
* that matched.
|
|
|
2372 |
*
|
|
|
2373 |
* <p> If the next token matches the <a
|
|
|
2374 |
* href="#Float-regex"><i>Float</i></a> regular expression defined above
|
|
|
2375 |
* then the token is converted into a <tt>double</tt> value as if by
|
|
|
2376 |
* removing all locale specific prefixes, group separators, and locale
|
|
|
2377 |
* specific suffixes, then mapping non-ASCII digits into ASCII
|
|
|
2378 |
* digits via {@link Character#digit Character.digit}, prepending a
|
|
|
2379 |
* negative sign (-) if the locale specific negative prefixes and suffixes
|
|
|
2380 |
* were present, and passing the resulting string to
|
|
|
2381 |
* {@link Double#parseDouble Double.parseDouble}. If the token matches
|
|
|
2382 |
* the localized NaN or infinity strings, then either "Nan" or "Infinity"
|
|
|
2383 |
* is passed to {@link Double#parseDouble(String) Double.parseDouble} as
|
|
|
2384 |
* appropriate.
|
|
|
2385 |
*
|
|
|
2386 |
* @return the <tt>double</tt> scanned from the input
|
|
|
2387 |
* @throws InputMismatchException
|
|
|
2388 |
* if the next token does not match the <i>Float</i>
|
|
|
2389 |
* regular expression, or is out of range
|
|
|
2390 |
* @throws NoSuchElementException if the input is exhausted
|
|
|
2391 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2392 |
*/
|
|
|
2393 |
public double nextDouble() {
|
|
|
2394 |
// Check cached result
|
|
|
2395 |
if ((typeCache != null) && (typeCache instanceof Double)) {
|
|
|
2396 |
double val = ((Double)typeCache).doubleValue();
|
|
|
2397 |
useTypeCache();
|
|
|
2398 |
return val;
|
|
|
2399 |
}
|
|
|
2400 |
setRadix(10);
|
|
|
2401 |
clearCaches();
|
|
|
2402 |
// Search for next float
|
|
|
2403 |
try {
|
|
|
2404 |
return Double.parseDouble(processFloatToken(next(floatPattern())));
|
|
|
2405 |
} catch (NumberFormatException nfe) {
|
|
|
2406 |
position = matcher.start(); // don't skip bad token
|
|
|
2407 |
throw new InputMismatchException(nfe.getMessage());
|
|
|
2408 |
}
|
|
|
2409 |
}
|
|
|
2410 |
|
|
|
2411 |
// Convenience methods for scanning multi precision numbers
|
|
|
2412 |
|
|
|
2413 |
/**
|
|
|
2414 |
* Returns true if the next token in this scanner's input can be
|
|
|
2415 |
* interpreted as a <code>BigInteger</code> in the default radix using the
|
|
|
2416 |
* {@link #nextBigInteger} method. The scanner does not advance past any
|
|
|
2417 |
* input.
|
|
|
2418 |
*
|
|
|
2419 |
* @return true if and only if this scanner's next token is a valid
|
|
|
2420 |
* <code>BigInteger</code>
|
|
|
2421 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2422 |
*/
|
|
|
2423 |
public boolean hasNextBigInteger() {
|
|
|
2424 |
return hasNextBigInteger(defaultRadix);
|
|
|
2425 |
}
|
|
|
2426 |
|
|
|
2427 |
/**
|
|
|
2428 |
* Returns true if the next token in this scanner's input can be
|
|
|
2429 |
* interpreted as a <code>BigInteger</code> in the specified radix using
|
|
|
2430 |
* the {@link #nextBigInteger} method. The scanner does not advance past
|
|
|
2431 |
* any input.
|
|
|
2432 |
*
|
|
|
2433 |
* @param radix the radix used to interpret the token as an integer
|
|
|
2434 |
* @return true if and only if this scanner's next token is a valid
|
|
|
2435 |
* <code>BigInteger</code>
|
|
|
2436 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2437 |
*/
|
|
|
2438 |
public boolean hasNextBigInteger(int radix) {
|
|
|
2439 |
setRadix(radix);
|
|
|
2440 |
boolean result = hasNext(integerPattern());
|
|
|
2441 |
if (result) { // Cache it
|
|
|
2442 |
try {
|
|
|
2443 |
String s = (matcher.group(SIMPLE_GROUP_INDEX) == null) ?
|
|
|
2444 |
processIntegerToken(hasNextResult) :
|
|
|
2445 |
hasNextResult;
|
|
|
2446 |
typeCache = new BigInteger(s, radix);
|
|
|
2447 |
} catch (NumberFormatException nfe) {
|
|
|
2448 |
result = false;
|
|
|
2449 |
}
|
|
|
2450 |
}
|
|
|
2451 |
return result;
|
|
|
2452 |
}
|
|
|
2453 |
|
|
|
2454 |
/**
|
|
|
2455 |
* Scans the next token of the input as a {@link java.math.BigInteger
|
|
|
2456 |
* BigInteger}.
|
|
|
2457 |
*
|
|
|
2458 |
* <p> An invocation of this method of the form
|
|
|
2459 |
* <tt>nextBigInteger()</tt> behaves in exactly the same way as the
|
|
|
2460 |
* invocation <tt>nextBigInteger(radix)</tt>, where <code>radix</code>
|
|
|
2461 |
* is the default radix of this scanner.
|
|
|
2462 |
*
|
|
|
2463 |
* @return the <tt>BigInteger</tt> scanned from the input
|
|
|
2464 |
* @throws InputMismatchException
|
|
|
2465 |
* if the next token does not match the <i>Integer</i>
|
|
|
2466 |
* regular expression, or is out of range
|
|
|
2467 |
* @throws NoSuchElementException if the input is exhausted
|
|
|
2468 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2469 |
*/
|
|
|
2470 |
public BigInteger nextBigInteger() {
|
|
|
2471 |
return nextBigInteger(defaultRadix);
|
|
|
2472 |
}
|
|
|
2473 |
|
|
|
2474 |
/**
|
|
|
2475 |
* Scans the next token of the input as a {@link java.math.BigInteger
|
|
|
2476 |
* BigInteger}.
|
|
|
2477 |
*
|
|
|
2478 |
* <p> If the next token matches the <a
|
|
|
2479 |
* href="#Integer-regex"><i>Integer</i></a> regular expression defined
|
|
|
2480 |
* above then the token is converted into a <tt>BigInteger</tt> value as if
|
|
|
2481 |
* by removing all group separators, mapping non-ASCII digits into ASCII
|
|
|
2482 |
* digits via the {@link Character#digit Character.digit}, and passing the
|
|
|
2483 |
* resulting string to the {@link
|
|
|
2484 |
* java.math.BigInteger#BigInteger(java.lang.String)
|
|
|
2485 |
* BigInteger(String, int)} constructor with the specified radix.
|
|
|
2486 |
*
|
|
|
2487 |
* @param radix the radix used to interpret the token
|
|
|
2488 |
* @return the <tt>BigInteger</tt> scanned from the input
|
|
|
2489 |
* @throws InputMismatchException
|
|
|
2490 |
* if the next token does not match the <i>Integer</i>
|
|
|
2491 |
* regular expression, or is out of range
|
|
|
2492 |
* @throws NoSuchElementException if the input is exhausted
|
|
|
2493 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2494 |
*/
|
|
|
2495 |
public BigInteger nextBigInteger(int radix) {
|
|
|
2496 |
// Check cached result
|
|
|
2497 |
if ((typeCache != null) && (typeCache instanceof BigInteger)
|
|
|
2498 |
&& this.radix == radix) {
|
|
|
2499 |
BigInteger val = (BigInteger)typeCache;
|
|
|
2500 |
useTypeCache();
|
|
|
2501 |
return val;
|
|
|
2502 |
}
|
|
|
2503 |
setRadix(radix);
|
|
|
2504 |
clearCaches();
|
|
|
2505 |
// Search for next int
|
|
|
2506 |
try {
|
|
|
2507 |
String s = next(integerPattern());
|
|
|
2508 |
if (matcher.group(SIMPLE_GROUP_INDEX) == null)
|
|
|
2509 |
s = processIntegerToken(s);
|
|
|
2510 |
return new BigInteger(s, radix);
|
|
|
2511 |
} catch (NumberFormatException nfe) {
|
|
|
2512 |
position = matcher.start(); // don't skip bad token
|
|
|
2513 |
throw new InputMismatchException(nfe.getMessage());
|
|
|
2514 |
}
|
|
|
2515 |
}
|
|
|
2516 |
|
|
|
2517 |
/**
|
|
|
2518 |
* Returns true if the next token in this scanner's input can be
|
|
|
2519 |
* interpreted as a <code>BigDecimal</code> using the
|
|
|
2520 |
* {@link #nextBigDecimal} method. The scanner does not advance past any
|
|
|
2521 |
* input.
|
|
|
2522 |
*
|
|
|
2523 |
* @return true if and only if this scanner's next token is a valid
|
|
|
2524 |
* <code>BigDecimal</code>
|
|
|
2525 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2526 |
*/
|
|
|
2527 |
public boolean hasNextBigDecimal() {
|
|
|
2528 |
setRadix(10);
|
|
|
2529 |
boolean result = hasNext(decimalPattern());
|
|
|
2530 |
if (result) { // Cache it
|
|
|
2531 |
try {
|
|
|
2532 |
String s = processFloatToken(hasNextResult);
|
|
|
2533 |
typeCache = new BigDecimal(s);
|
|
|
2534 |
} catch (NumberFormatException nfe) {
|
|
|
2535 |
result = false;
|
|
|
2536 |
}
|
|
|
2537 |
}
|
|
|
2538 |
return result;
|
|
|
2539 |
}
|
|
|
2540 |
|
|
|
2541 |
/**
|
|
|
2542 |
* Scans the next token of the input as a {@link java.math.BigDecimal
|
|
|
2543 |
* BigDecimal}.
|
|
|
2544 |
*
|
|
|
2545 |
* <p> If the next token matches the <a
|
|
|
2546 |
* href="#Decimal-regex"><i>Decimal</i></a> regular expression defined
|
|
|
2547 |
* above then the token is converted into a <tt>BigDecimal</tt> value as if
|
|
|
2548 |
* by removing all group separators, mapping non-ASCII digits into ASCII
|
|
|
2549 |
* digits via the {@link Character#digit Character.digit}, and passing the
|
|
|
2550 |
* resulting string to the {@link
|
|
|
2551 |
* java.math.BigDecimal#BigDecimal(java.lang.String) BigDecimal(String)}
|
|
|
2552 |
* constructor.
|
|
|
2553 |
*
|
|
|
2554 |
* @return the <tt>BigDecimal</tt> scanned from the input
|
|
|
2555 |
* @throws InputMismatchException
|
|
|
2556 |
* if the next token does not match the <i>Decimal</i>
|
|
|
2557 |
* regular expression, or is out of range
|
|
|
2558 |
* @throws NoSuchElementException if the input is exhausted
|
|
|
2559 |
* @throws IllegalStateException if this scanner is closed
|
|
|
2560 |
*/
|
|
|
2561 |
public BigDecimal nextBigDecimal() {
|
|
|
2562 |
// Check cached result
|
|
|
2563 |
if ((typeCache != null) && (typeCache instanceof BigDecimal)) {
|
|
|
2564 |
BigDecimal val = (BigDecimal)typeCache;
|
|
|
2565 |
useTypeCache();
|
|
|
2566 |
return val;
|
|
|
2567 |
}
|
|
|
2568 |
setRadix(10);
|
|
|
2569 |
clearCaches();
|
|
|
2570 |
// Search for next float
|
|
|
2571 |
try {
|
|
|
2572 |
String s = processFloatToken(next(decimalPattern()));
|
|
|
2573 |
return new BigDecimal(s);
|
|
|
2574 |
} catch (NumberFormatException nfe) {
|
|
|
2575 |
position = matcher.start(); // don't skip bad token
|
|
|
2576 |
throw new InputMismatchException(nfe.getMessage());
|
|
|
2577 |
}
|
|
|
2578 |
}
|
|
|
2579 |
|
|
|
2580 |
/**
|
|
|
2581 |
* Resets this scanner.
|
|
|
2582 |
*
|
|
|
2583 |
* <p> Resetting a scanner discards all of its explicit state
|
|
|
2584 |
* information which may have been changed by invocations of {@link
|
|
|
2585 |
* #useDelimiter}, {@link #useLocale}, or {@link #useRadix}.
|
|
|
2586 |
*
|
|
|
2587 |
* <p> An invocation of this method of the form
|
|
|
2588 |
* <tt>scanner.reset()</tt> behaves in exactly the same way as the
|
|
|
2589 |
* invocation
|
|
|
2590 |
*
|
|
|
2591 |
* <blockquote><pre>
|
|
|
2592 |
* scanner.useDelimiter("\\p{javaWhitespace}+")
|
|
|
2593 |
* .useLocale(Locale.getDefault())
|
|
|
2594 |
* .useRadix(10);
|
|
|
2595 |
* </pre></blockquote>
|
|
|
2596 |
*
|
|
|
2597 |
* @return this scanner
|
|
|
2598 |
*
|
|
|
2599 |
* @since 1.6
|
|
|
2600 |
*/
|
|
|
2601 |
public Scanner reset() {
|
|
|
2602 |
delimPattern = WHITESPACE_PATTERN;
|
|
|
2603 |
useLocale(Locale.getDefault());
|
|
|
2604 |
useRadix(10);
|
|
|
2605 |
clearCaches();
|
|
|
2606 |
return this;
|
|
|
2607 |
}
|
|
|
2608 |
}
|