author | sherman |
Mon, 31 Oct 2016 10:34:31 -0700 | |
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parent 39141 | e5d52546ba3a |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2015, Oracle and/or its affiliates. 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. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.util; |
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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.nio.file.Path; |
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import java.nio.file.Files; |
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import java.text.*; |
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import java.util.function.Consumer; |
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import java.util.regex.*; |
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import java.util.stream.Stream; |
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import java.util.stream.StreamSupport; |
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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} 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 {@code next} 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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* {@code System.in}: |
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* <blockquote><pre>{@code |
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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} types to be |
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* assigned from entries in a file {@code myNumbers}: |
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* <blockquote><pre>{@code |
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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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* } |
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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>{@code |
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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(); |
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* }</pre></blockquote> |
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* <p> |
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* prints the following output: |
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* <blockquote><pre>{@code |
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* 1 |
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* 2 |
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* red |
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* blue |
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* }</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>{@code |
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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(); |
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* }</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 Character#isWhitespace(char) |
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* Character.isWhitespace()}. The {@link #reset 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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* 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 {@code hasNext()} |
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* and {@code next()} methods may block waiting for further input. Whether a |
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* {@code hasNext()} method blocks has no connection to whether or not its |
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* associated {@code next()} method will block. The {@link #tokens} method |
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* may also block waiting for input. |
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* |
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* <p>The {@link #findInLine findInLine()}, |
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* {@link #findWithinHorizon findWithinHorizon()}, |
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* {@link #skip skip()}, and {@link #findAll findAll()} |
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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 {@code "\\s+"} will return no empty |
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* tokens since it matches multiple instances of the delimiter. The delimiting |
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* pattern {@code "\\s"} 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 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 {@code IOException} 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} 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} 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} parameter into |
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* any method of a {@code Scanner} will cause a |
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* {@code NullPointerException} 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} regardless of whether it was previously changed. |
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* |
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* <h3> <a name="localized-numbers">Localized numbers</a> </h3> |
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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(Locale.Category) |
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* Locale.getDefault(Locale.Category.FORMAT)} method; it may be changed via the {@link |
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* #useLocale 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, {@code df}, and its and |
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* {@link java.text.DecimalFormatSymbols DecimalFormatSymbols} object, |
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* {@code dfs}. |
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* |
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* <blockquote><dl> |
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* <dt><i>LocalGroupSeparator </i> |
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* <dd>The character used to separate thousands groups, |
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* <i>i.e.,</i> {@code dfs.}{@link |
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* java.text.DecimalFormatSymbols#getGroupingSeparator |
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* getGroupingSeparator()} |
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* <dt><i>LocalDecimalSeparator </i> |
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* <dd>The character used for the decimal point, |
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* <i>i.e.,</i> {@code dfs.}{@link |
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* java.text.DecimalFormatSymbols#getDecimalSeparator |
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* getDecimalSeparator()} |
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* <dt><i>LocalPositivePrefix </i> |
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* <dd>The string that appears before a positive number (may |
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* be empty), <i>i.e.,</i> {@code df.}{@link |
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* java.text.DecimalFormat#getPositivePrefix |
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* getPositivePrefix()} |
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* <dt><i>LocalPositiveSuffix </i> |
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* <dd>The string that appears after a positive number (may be |
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* empty), <i>i.e.,</i> {@code df.}{@link |
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* java.text.DecimalFormat#getPositiveSuffix |
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* getPositiveSuffix()} |
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* <dt><i>LocalNegativePrefix </i> |
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* <dd>The string that appears before a negative number (may |
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* be empty), <i>i.e.,</i> {@code df.}{@link |
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* java.text.DecimalFormat#getNegativePrefix |
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* getNegativePrefix()} |
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* <dt><i>LocalNegativeSuffix </i> |
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* <dd>The string that appears after a negative number (may be |
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* empty), <i>i.e.,</i> {@code df.}{@link |
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* java.text.DecimalFormat#getNegativeSuffix |
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* getNegativeSuffix()} |
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* <dt><i>LocalNaN </i> |
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* <dd>The string that represents not-a-number for |
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* floating-point values, |
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* <i>i.e.,</i> {@code dfs.}{@link |
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* java.text.DecimalFormatSymbols#getNaN |
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* getNaN()} |
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* <dt><i>LocalInfinity </i> |
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* <dd>The string that represents infinity for floating-point |
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* values, <i>i.e.,</i> {@code dfs.}{@link |
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* java.text.DecimalFormatSymbols#getInfinity |
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* getInfinity()} |
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* </dl></blockquote> |
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* |
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* <h4> <a name="number-syntax">Number syntax</a> </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 in base 10). |
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* |
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* <dl> |
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* <dt><i>NonAsciiDigit</i>: |
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* <dd>A non-ASCII character c for which |
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* {@link java.lang.Character#isDigit Character.isDigit}{@code (c)} |
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* returns true |
2 | 227 |
* |
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* <dt><i>Non0Digit</i>: |
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* <dd>{@code [1-}<i>Rmax</i>{@code ] | }<i>NonASCIIDigit</i> |
2 | 230 |
* |
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* <dt><i>Digit</i>: |
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* <dd>{@code [0-}<i>Rmax</i>{@code ] | }<i>NonASCIIDigit</i> |
2 | 233 |
* |
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* <dt><i>GroupedNumeral</i>: |
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* <dd><code>( </code><i>Non0Digit</i> |
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* <i>Digit</i>{@code ? |
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* }<i>Digit</i>{@code ?} |
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* <dd> <code>( </code><i>LocalGroupSeparator</i> |
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* <i>Digit</i> |
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* <i>Digit</i> |
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* <i>Digit</i>{@code )+ )} |
2 | 242 |
* |
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* <dt><i>Numeral</i>: |
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* <dd>{@code ( ( }<i>Digit</i>{@code + ) |
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* | }<i>GroupedNumeral</i>{@code )} |
2 | 246 |
* |
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* <dt><a name="Integer-regex"><i>Integer</i>:</a> |
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* <dd>{@code ( [-+]? ( }<i>Numeral</i>{@code |
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* ) )} |
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* <dd>{@code | }<i>LocalPositivePrefix</i> <i>Numeral</i> |
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* <i>LocalPositiveSuffix</i> |
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* <dd>{@code | }<i>LocalNegativePrefix</i> <i>Numeral</i> |
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* <i>LocalNegativeSuffix</i> |
2 | 254 |
* |
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* <dt><i>DecimalNumeral</i>: |
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* <dd><i>Numeral</i> |
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* <dd>{@code | }<i>Numeral</i> |
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* <i>LocalDecimalSeparator</i> |
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* <i>Digit</i>{@code *} |
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* <dd>{@code | }<i>LocalDecimalSeparator</i> |
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* <i>Digit</i>{@code +} |
2 | 262 |
* |
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* <dt><i>Exponent</i>: |
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* <dd>{@code ( [eE] [+-]? }<i>Digit</i>{@code + )} |
2 | 265 |
* |
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* <dt><a name="Decimal-regex"><i>Decimal</i>:</a> |
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* <dd>{@code ( [-+]? }<i>DecimalNumeral</i> |
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* <i>Exponent</i>{@code ? )} |
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* <dd>{@code | }<i>LocalPositivePrefix</i> |
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* <i>DecimalNumeral</i> |
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* <i>LocalPositiveSuffix</i> |
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* <i>Exponent</i>{@code ?} |
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* <dd>{@code | }<i>LocalNegativePrefix</i> |
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* <i>DecimalNumeral</i> |
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* <i>LocalNegativeSuffix</i> |
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* <i>Exponent</i>{@code ?} |
2 | 277 |
* |
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* <dt><i>HexFloat</i>: |
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* <dd>{@code [-+]? 0[xX][0-9a-fA-F]*\.[0-9a-fA-F]+ |
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* ([pP][-+]?[0-9]+)?} |
2 | 281 |
* |
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* <dt><i>NonNumber</i>: |
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* <dd>{@code NaN |
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* | }<i>LocalNan</i>{@code |
2 | 285 |
* | Infinity |
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* | }<i>LocalInfinity</i> |
2 | 287 |
* |
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* <dt><i>SignedNonNumber</i>: |
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* <dd>{@code ( [-+]? }<i>NonNumber</i>{@code )} |
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* <dd>{@code | }<i>LocalPositivePrefix</i> |
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* <i>NonNumber</i> |
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* <i>LocalPositiveSuffix</i> |
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* <dd>{@code | }<i>LocalNegativePrefix</i> |
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* <i>NonNumber</i> |
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* <i>LocalNegativeSuffix</i> |
2 | 296 |
* |
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* <dt><a name="Float-regex"><i>Float</i></a>: |
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* <dd><i>Decimal</i> |
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* {@code | }<i>HexFloat</i> |
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* {@code | }<i>SignedNonNumber</i> |
2 | 301 |
* |
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* </dl> |
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* <p>Whitespace is not significant in the above regular expressions. |
2 | 304 |
* |
305 |
* @since 1.5 |
|
306 |
*/ |
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public final class Scanner implements Iterator<String>, Closeable { |
2 | 308 |
|
309 |
// Internal buffer used to hold input |
|
310 |
private CharBuffer buf; |
|
311 |
||
312 |
// Size of internal character buffer |
|
313 |
private static final int BUFFER_SIZE = 1024; // change to 1024; |
|
314 |
||
315 |
// The index into the buffer currently held by the Scanner |
|
316 |
private int position; |
|
317 |
||
318 |
// Internal matcher used for finding delimiters |
|
319 |
private Matcher matcher; |
|
320 |
||
321 |
// Pattern used to delimit tokens |
|
322 |
private Pattern delimPattern; |
|
323 |
||
324 |
// Pattern found in last hasNext operation |
|
325 |
private Pattern hasNextPattern; |
|
326 |
||
327 |
// Position after last hasNext operation |
|
328 |
private int hasNextPosition; |
|
329 |
||
330 |
// Result after last hasNext operation |
|
331 |
private String hasNextResult; |
|
332 |
||
333 |
// The input source |
|
334 |
private Readable source; |
|
335 |
||
336 |
// Boolean is true if source is done |
|
337 |
private boolean sourceClosed = false; |
|
338 |
||
339 |
// Boolean indicating more input is required |
|
340 |
private boolean needInput = false; |
|
341 |
||
342 |
// Boolean indicating if a delim has been skipped this operation |
|
343 |
private boolean skipped = false; |
|
344 |
||
345 |
// A store of a position that the scanner may fall back to |
|
346 |
private int savedScannerPosition = -1; |
|
347 |
||
348 |
// A cache of the last primitive type scanned |
|
349 |
private Object typeCache = null; |
|
350 |
||
351 |
// Boolean indicating if a match result is available |
|
352 |
private boolean matchValid = false; |
|
353 |
||
354 |
// Boolean indicating if this scanner has been closed |
|
355 |
private boolean closed = false; |
|
356 |
||
357 |
// The current radix used by this scanner |
|
358 |
private int radix = 10; |
|
359 |
||
360 |
// The default radix for this scanner |
|
361 |
private int defaultRadix = 10; |
|
362 |
||
363 |
// The locale used by this scanner |
|
364 |
private Locale locale = null; |
|
365 |
||
366 |
// A cache of the last few recently used Patterns |
|
35787 | 367 |
private PatternLRUCache patternCache = new PatternLRUCache(7); |
2 | 368 |
|
369 |
// A holder of the last IOException encountered |
|
370 |
private IOException lastException; |
|
371 |
||
32650 | 372 |
// Number of times this scanner's state has been modified. |
373 |
// Generally incremented on most public APIs and checked |
|
374 |
// within spliterator implementations. |
|
375 |
int modCount; |
|
376 |
||
2 | 377 |
// A pattern for java whitespace |
378 |
private static Pattern WHITESPACE_PATTERN = Pattern.compile( |
|
379 |
"\\p{javaWhitespace}+"); |
|
380 |
||
381 |
// A pattern for any token |
|
382 |
private static Pattern FIND_ANY_PATTERN = Pattern.compile("(?s).*"); |
|
383 |
||
384 |
// A pattern for non-ASCII digits |
|
385 |
private static Pattern NON_ASCII_DIGIT = Pattern.compile( |
|
386 |
"[\\p{javaDigit}&&[^0-9]]"); |
|
387 |
||
388 |
// Fields and methods to support scanning primitive types |
|
389 |
||
390 |
/** |
|
391 |
* Locale dependent values used to scan numbers |
|
392 |
*/ |
|
393 |
private String groupSeparator = "\\,"; |
|
394 |
private String decimalSeparator = "\\."; |
|
395 |
private String nanString = "NaN"; |
|
396 |
private String infinityString = "Infinity"; |
|
397 |
private String positivePrefix = ""; |
|
398 |
private String negativePrefix = "\\-"; |
|
399 |
private String positiveSuffix = ""; |
|
400 |
private String negativeSuffix = ""; |
|
401 |
||
402 |
/** |
|
403 |
* Fields and an accessor method to match booleans |
|
404 |
*/ |
|
405 |
private static volatile Pattern boolPattern; |
|
406 |
private static final String BOOLEAN_PATTERN = "true|false"; |
|
407 |
private static Pattern boolPattern() { |
|
408 |
Pattern bp = boolPattern; |
|
409 |
if (bp == null) |
|
410 |
boolPattern = bp = Pattern.compile(BOOLEAN_PATTERN, |
|
411 |
Pattern.CASE_INSENSITIVE); |
|
412 |
return bp; |
|
413 |
} |
|
414 |
||
415 |
/** |
|
416 |
* Fields and methods to match bytes, shorts, ints, and longs |
|
417 |
*/ |
|
418 |
private Pattern integerPattern; |
|
419 |
private String digits = "0123456789abcdefghijklmnopqrstuvwxyz"; |
|
420 |
private String non0Digit = "[\\p{javaDigit}&&[^0]]"; |
|
421 |
private int SIMPLE_GROUP_INDEX = 5; |
|
422 |
private String buildIntegerPatternString() { |
|
423 |
String radixDigits = digits.substring(0, radix); |
|
424 |
// \\p{javaDigit} is not guaranteed to be appropriate |
|
425 |
// here but what can we do? The final authority will be |
|
426 |
// whatever parse method is invoked, so ultimately the |
|
427 |
// Scanner will do the right thing |
|
428 |
String digit = "((?i)["+radixDigits+"]|\\p{javaDigit})"; |
|
429 |
String groupedNumeral = "("+non0Digit+digit+"?"+digit+"?("+ |
|
430 |
groupSeparator+digit+digit+digit+")+)"; |
|
431 |
// digit++ is the possessive form which is necessary for reducing |
|
432 |
// backtracking that would otherwise cause unacceptable performance |
|
433 |
String numeral = "(("+ digit+"++)|"+groupedNumeral+")"; |
|
434 |
String javaStyleInteger = "([-+]?(" + numeral + "))"; |
|
435 |
String negativeInteger = negativePrefix + numeral + negativeSuffix; |
|
436 |
String positiveInteger = positivePrefix + numeral + positiveSuffix; |
|
437 |
return "("+ javaStyleInteger + ")|(" + |
|
438 |
positiveInteger + ")|(" + |
|
439 |
negativeInteger + ")"; |
|
440 |
} |
|
441 |
private Pattern integerPattern() { |
|
442 |
if (integerPattern == null) { |
|
443 |
integerPattern = patternCache.forName(buildIntegerPatternString()); |
|
444 |
} |
|
445 |
return integerPattern; |
|
446 |
} |
|
447 |
||
448 |
/** |
|
449 |
* Fields and an accessor method to match line separators |
|
450 |
*/ |
|
451 |
private static volatile Pattern separatorPattern; |
|
452 |
private static volatile Pattern linePattern; |
|
453 |
private static final String LINE_SEPARATOR_PATTERN = |
|
454 |
"\r\n|[\n\r\u2028\u2029\u0085]"; |
|
455 |
private static final String LINE_PATTERN = ".*("+LINE_SEPARATOR_PATTERN+")|.+$"; |
|
456 |
||
457 |
private static Pattern separatorPattern() { |
|
458 |
Pattern sp = separatorPattern; |
|
459 |
if (sp == null) |
|
460 |
separatorPattern = sp = Pattern.compile(LINE_SEPARATOR_PATTERN); |
|
461 |
return sp; |
|
462 |
} |
|
463 |
||
464 |
private static Pattern linePattern() { |
|
465 |
Pattern lp = linePattern; |
|
466 |
if (lp == null) |
|
467 |
linePattern = lp = Pattern.compile(LINE_PATTERN); |
|
468 |
return lp; |
|
469 |
} |
|
470 |
||
471 |
/** |
|
472 |
* Fields and methods to match floats and doubles |
|
473 |
*/ |
|
474 |
private Pattern floatPattern; |
|
475 |
private Pattern decimalPattern; |
|
476 |
private void buildFloatAndDecimalPattern() { |
|
477 |
// \\p{javaDigit} may not be perfect, see above |
|
478 |
String digit = "([0-9]|(\\p{javaDigit}))"; |
|
479 |
String exponent = "([eE][+-]?"+digit+"+)?"; |
|
480 |
String groupedNumeral = "("+non0Digit+digit+"?"+digit+"?("+ |
|
481 |
groupSeparator+digit+digit+digit+")+)"; |
|
482 |
// Once again digit++ is used for performance, as above |
|
483 |
String numeral = "(("+digit+"++)|"+groupedNumeral+")"; |
|
484 |
String decimalNumeral = "("+numeral+"|"+numeral + |
|
485 |
decimalSeparator + digit + "*+|"+ decimalSeparator + |
|
486 |
digit + "++)"; |
|
487 |
String nonNumber = "(NaN|"+nanString+"|Infinity|"+ |
|
488 |
infinityString+")"; |
|
489 |
String positiveFloat = "(" + positivePrefix + decimalNumeral + |
|
490 |
positiveSuffix + exponent + ")"; |
|
491 |
String negativeFloat = "(" + negativePrefix + decimalNumeral + |
|
492 |
negativeSuffix + exponent + ")"; |
|
493 |
String decimal = "(([-+]?" + decimalNumeral + exponent + ")|"+ |
|
494 |
positiveFloat + "|" + negativeFloat + ")"; |
|
495 |
String hexFloat = |
|
496 |
"[-+]?0[xX][0-9a-fA-F]*\\.[0-9a-fA-F]+([pP][-+]?[0-9]+)?"; |
|
497 |
String positiveNonNumber = "(" + positivePrefix + nonNumber + |
|
498 |
positiveSuffix + ")"; |
|
499 |
String negativeNonNumber = "(" + negativePrefix + nonNumber + |
|
500 |
negativeSuffix + ")"; |
|
501 |
String signedNonNumber = "(([-+]?"+nonNumber+")|" + |
|
502 |
positiveNonNumber + "|" + |
|
503 |
negativeNonNumber + ")"; |
|
504 |
floatPattern = Pattern.compile(decimal + "|" + hexFloat + "|" + |
|
505 |
signedNonNumber); |
|
506 |
decimalPattern = Pattern.compile(decimal); |
|
507 |
} |
|
508 |
private Pattern floatPattern() { |
|
509 |
if (floatPattern == null) { |
|
510 |
buildFloatAndDecimalPattern(); |
|
511 |
} |
|
512 |
return floatPattern; |
|
513 |
} |
|
514 |
private Pattern decimalPattern() { |
|
515 |
if (decimalPattern == null) { |
|
516 |
buildFloatAndDecimalPattern(); |
|
517 |
} |
|
518 |
return decimalPattern; |
|
519 |
} |
|
520 |
||
521 |
// Constructors |
|
522 |
||
523 |
/** |
|
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|
524 |
* Constructs a {@code Scanner} that returns values scanned |
2 | 525 |
* from the specified source delimited by the specified pattern. |
526 |
* |
|
14014 | 527 |
* @param source A character source implementing the Readable interface |
2 | 528 |
* @param pattern A delimiting pattern |
529 |
*/ |
|
530 |
private Scanner(Readable source, Pattern pattern) { |
|
7966
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changeset
|
531 |
assert source != null : "source should not be null"; |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
532 |
assert pattern != null : "pattern should not be null"; |
2 | 533 |
this.source = source; |
534 |
delimPattern = pattern; |
|
535 |
buf = CharBuffer.allocate(BUFFER_SIZE); |
|
536 |
buf.limit(0); |
|
537 |
matcher = delimPattern.matcher(buf); |
|
538 |
matcher.useTransparentBounds(true); |
|
539 |
matcher.useAnchoringBounds(false); |
|
6489
9e7015635425
4700857: RFE: separating user locale and user interface locale
naoto
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5998
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changeset
|
540 |
useLocale(Locale.getDefault(Locale.Category.FORMAT)); |
2 | 541 |
} |
542 |
||
543 |
/** |
|
32108
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avstepan
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diff
changeset
|
544 |
* Constructs a new {@code Scanner} that produces values scanned |
2 | 545 |
* from the specified source. |
546 |
* |
|
547 |
* @param source A character source implementing the {@link Readable} |
|
548 |
* interface |
|
549 |
*/ |
|
550 |
public Scanner(Readable source) { |
|
8166
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briangoetz
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diff
changeset
|
551 |
this(Objects.requireNonNull(source, "source"), WHITESPACE_PATTERN); |
2 | 552 |
} |
553 |
||
554 |
/** |
|
32108
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avstepan
parents:
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diff
changeset
|
555 |
* Constructs a new {@code Scanner} that produces values scanned |
2 | 556 |
* from the specified input stream. Bytes from the stream are converted |
557 |
* into characters using the underlying platform's |
|
558 |
* {@linkplain java.nio.charset.Charset#defaultCharset() default charset}. |
|
559 |
* |
|
560 |
* @param source An input stream to be scanned |
|
561 |
*/ |
|
562 |
public Scanner(InputStream source) { |
|
563 |
this(new InputStreamReader(source), WHITESPACE_PATTERN); |
|
564 |
} |
|
565 |
||
566 |
/** |
|
32108
aa5490a167ee
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avstepan
parents:
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diff
changeset
|
567 |
* Constructs a new {@code Scanner} that produces values scanned |
2 | 568 |
* from the specified input stream. Bytes from the stream are converted |
569 |
* into characters using the specified charset. |
|
570 |
* |
|
571 |
* @param source An input stream to be scanned |
|
572 |
* @param charsetName The encoding type used to convert bytes from the |
|
573 |
* stream into characters to be scanned |
|
574 |
* @throws IllegalArgumentException if the specified character set |
|
575 |
* does not exist |
|
576 |
*/ |
|
577 |
public Scanner(InputStream source, String charsetName) { |
|
8166
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briangoetz
parents:
8158
diff
changeset
|
578 |
this(makeReadable(Objects.requireNonNull(source, "source"), toCharset(charsetName)), |
7966
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
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diff
changeset
|
579 |
WHITESPACE_PATTERN); |
2 | 580 |
} |
581 |
||
7966
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
582 |
/** |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
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diff
changeset
|
583 |
* Returns a charset object for the given charset name. |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
584 |
* @throws NullPointerException is csn is null |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
585 |
* @throws IllegalArgumentException if the charset is not supported |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
586 |
*/ |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
587 |
private static Charset toCharset(String csn) { |
8166
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7012540: java.util.Objects.nonNull() incorrectly named
briangoetz
parents:
8158
diff
changeset
|
588 |
Objects.requireNonNull(csn, "charsetName"); |
2 | 589 |
try { |
7966
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
590 |
return Charset.forName(csn); |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
591 |
} catch (IllegalCharsetNameException|UnsupportedCharsetException e) { |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
592 |
// IllegalArgumentException should be thrown |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
593 |
throw new IllegalArgumentException(e); |
2 | 594 |
} |
7966
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
595 |
} |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
596 |
|
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
597 |
private static Readable makeReadable(InputStream source, Charset charset) { |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
598 |
return new InputStreamReader(source, charset); |
2 | 599 |
} |
600 |
||
601 |
/** |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
602 |
* Constructs a new {@code Scanner} that produces values scanned |
2 | 603 |
* from the specified file. Bytes from the file are converted into |
604 |
* characters using the underlying platform's |
|
605 |
* {@linkplain java.nio.charset.Charset#defaultCharset() default charset}. |
|
606 |
* |
|
607 |
* @param source A file to be scanned |
|
608 |
* @throws FileNotFoundException if source is not found |
|
609 |
*/ |
|
7966
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
610 |
public Scanner(File source) throws FileNotFoundException { |
2 | 611 |
this((ReadableByteChannel)(new FileInputStream(source).getChannel())); |
612 |
} |
|
613 |
||
614 |
/** |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
615 |
* Constructs a new {@code Scanner} that produces values scanned |
2 | 616 |
* from the specified file. Bytes from the file are converted into |
617 |
* characters using the specified charset. |
|
618 |
* |
|
619 |
* @param source A file to be scanned |
|
620 |
* @param charsetName The encoding type used to convert bytes from the file |
|
621 |
* into characters to be scanned |
|
622 |
* @throws FileNotFoundException if source is not found |
|
623 |
* @throws IllegalArgumentException if the specified encoding is |
|
624 |
* not found |
|
625 |
*/ |
|
626 |
public Scanner(File source, String charsetName) |
|
627 |
throws FileNotFoundException |
|
628 |
{ |
|
8166
13423c0952ad
7012540: java.util.Objects.nonNull() incorrectly named
briangoetz
parents:
8158
diff
changeset
|
629 |
this(Objects.requireNonNull(source), toDecoder(charsetName)); |
7966
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
630 |
} |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
631 |
|
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
632 |
private Scanner(File source, CharsetDecoder dec) |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
633 |
throws FileNotFoundException |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
634 |
{ |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
635 |
this(makeReadable((ReadableByteChannel)(new FileInputStream(source).getChannel()), dec)); |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
636 |
} |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
637 |
|
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
638 |
private static CharsetDecoder toDecoder(String charsetName) { |
8166
13423c0952ad
7012540: java.util.Objects.nonNull() incorrectly named
briangoetz
parents:
8158
diff
changeset
|
639 |
Objects.requireNonNull(charsetName, "charsetName"); |
7966
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
640 |
try { |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
641 |
return Charset.forName(charsetName).newDecoder(); |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
642 |
} catch (IllegalCharsetNameException|UnsupportedCharsetException unused) { |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
643 |
throw new IllegalArgumentException(charsetName); |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
644 |
} |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
645 |
} |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
646 |
|
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
647 |
private static Readable makeReadable(ReadableByteChannel source, |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
648 |
CharsetDecoder dec) { |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
649 |
return Channels.newReader(source, dec, -1); |
2 | 650 |
} |
651 |
||
652 |
/** |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
653 |
* Constructs a new {@code Scanner} that produces values scanned |
2057
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
654 |
* from the specified file. Bytes from the file are converted into |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
655 |
* characters using the underlying platform's |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
656 |
* {@linkplain java.nio.charset.Charset#defaultCharset() default charset}. |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
657 |
* |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
658 |
* @param source |
8158 | 659 |
* the path to the file to be scanned |
2057
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
660 |
* @throws IOException |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
661 |
* if an I/O error occurs opening source |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
662 |
* |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
663 |
* @since 1.7 |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
664 |
*/ |
8158 | 665 |
public Scanner(Path source) |
2057
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
666 |
throws IOException |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
667 |
{ |
8158 | 668 |
this(Files.newInputStream(source)); |
2057
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
669 |
} |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
670 |
|
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
671 |
/** |
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
672 |
* Constructs a new {@code Scanner} that produces values scanned |
2057
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
673 |
* from the specified file. Bytes from the file are converted into |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
674 |
* characters using the specified charset. |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
675 |
* |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
676 |
* @param source |
8158 | 677 |
* the path to the file to be scanned |
2057
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
678 |
* @param charsetName |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
679 |
* The encoding type used to convert bytes from the file |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
680 |
* into characters to be scanned |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
681 |
* @throws IOException |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
682 |
* if an I/O error occurs opening source |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
683 |
* @throws IllegalArgumentException |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
684 |
* if the specified encoding is not found |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
685 |
* @since 1.7 |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
686 |
*/ |
8158 | 687 |
public Scanner(Path source, String charsetName) throws IOException { |
8166
13423c0952ad
7012540: java.util.Objects.nonNull() incorrectly named
briangoetz
parents:
8158
diff
changeset
|
688 |
this(Objects.requireNonNull(source), toCharset(charsetName)); |
7966
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
689 |
} |
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
690 |
|
8158 | 691 |
private Scanner(Path source, Charset charset) throws IOException { |
692 |
this(makeReadable(Files.newInputStream(source), charset)); |
|
2057
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
693 |
} |
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
694 |
|
3acf8e5e2ca0
6781363: New I/O: Update socket-channel API to jsr203/nio2-b99
alanb
parents:
2
diff
changeset
|
695 |
/** |
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
696 |
* Constructs a new {@code Scanner} that produces values scanned |
2 | 697 |
* from the specified string. |
698 |
* |
|
699 |
* @param source A string to scan |
|
700 |
*/ |
|
701 |
public Scanner(String source) { |
|
702 |
this(new StringReader(source), WHITESPACE_PATTERN); |
|
703 |
} |
|
704 |
||
705 |
/** |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
706 |
* Constructs a new {@code Scanner} that produces values scanned |
2 | 707 |
* from the specified channel. Bytes from the source are converted into |
708 |
* characters using the underlying platform's |
|
709 |
* {@linkplain java.nio.charset.Charset#defaultCharset() default charset}. |
|
710 |
* |
|
711 |
* @param source A channel to scan |
|
712 |
*/ |
|
713 |
public Scanner(ReadableByteChannel source) { |
|
8166
13423c0952ad
7012540: java.util.Objects.nonNull() incorrectly named
briangoetz
parents:
8158
diff
changeset
|
714 |
this(makeReadable(Objects.requireNonNull(source, "source")), |
7966
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
715 |
WHITESPACE_PATTERN); |
2 | 716 |
} |
717 |
||
718 |
private static Readable makeReadable(ReadableByteChannel source) { |
|
7966
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
719 |
return makeReadable(source, Charset.defaultCharset().newDecoder()); |
2 | 720 |
} |
721 |
||
722 |
/** |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
723 |
* Constructs a new {@code Scanner} that produces values scanned |
2 | 724 |
* from the specified channel. Bytes from the source are converted into |
725 |
* characters using the specified charset. |
|
726 |
* |
|
727 |
* @param source A channel to scan |
|
728 |
* @param charsetName The encoding type used to convert bytes from the |
|
729 |
* channel into characters to be scanned |
|
730 |
* @throws IllegalArgumentException if the specified character set |
|
731 |
* does not exist |
|
732 |
*/ |
|
733 |
public Scanner(ReadableByteChannel source, String charsetName) { |
|
8166
13423c0952ad
7012540: java.util.Objects.nonNull() incorrectly named
briangoetz
parents:
8158
diff
changeset
|
734 |
this(makeReadable(Objects.requireNonNull(source, "source"), toDecoder(charsetName)), |
7966
a23e3f47c5a8
7000511: PrintStream, PrintWriter, Formatter, Scanner leave files open when exception thrown
chegar
parents:
7668
diff
changeset
|
735 |
WHITESPACE_PATTERN); |
2 | 736 |
} |
737 |
||
738 |
// Private primitives used to support scanning |
|
739 |
||
740 |
private void saveState() { |
|
741 |
savedScannerPosition = position; |
|
742 |
} |
|
743 |
||
744 |
private void revertState() { |
|
745 |
this.position = savedScannerPosition; |
|
746 |
savedScannerPosition = -1; |
|
747 |
skipped = false; |
|
748 |
} |
|
749 |
||
750 |
private boolean revertState(boolean b) { |
|
751 |
this.position = savedScannerPosition; |
|
752 |
savedScannerPosition = -1; |
|
753 |
skipped = false; |
|
754 |
return b; |
|
755 |
} |
|
756 |
||
757 |
private void cacheResult() { |
|
758 |
hasNextResult = matcher.group(); |
|
759 |
hasNextPosition = matcher.end(); |
|
760 |
hasNextPattern = matcher.pattern(); |
|
761 |
} |
|
762 |
||
763 |
private void cacheResult(String result) { |
|
764 |
hasNextResult = result; |
|
765 |
hasNextPosition = matcher.end(); |
|
766 |
hasNextPattern = matcher.pattern(); |
|
767 |
} |
|
768 |
||
769 |
// Clears both regular cache and type cache |
|
770 |
private void clearCaches() { |
|
771 |
hasNextPattern = null; |
|
772 |
typeCache = null; |
|
773 |
} |
|
774 |
||
775 |
// Also clears both the regular cache and the type cache |
|
776 |
private String getCachedResult() { |
|
777 |
position = hasNextPosition; |
|
778 |
hasNextPattern = null; |
|
779 |
typeCache = null; |
|
780 |
return hasNextResult; |
|
781 |
} |
|
782 |
||
783 |
// Also clears both the regular cache and the type cache |
|
784 |
private void useTypeCache() { |
|
785 |
if (closed) |
|
786 |
throw new IllegalStateException("Scanner closed"); |
|
787 |
position = hasNextPosition; |
|
788 |
hasNextPattern = null; |
|
789 |
typeCache = null; |
|
790 |
} |
|
791 |
||
792 |
// Tries to read more input. May block. |
|
793 |
private void readInput() { |
|
794 |
if (buf.limit() == buf.capacity()) |
|
795 |
makeSpace(); |
|
796 |
// Prepare to receive data |
|
797 |
int p = buf.position(); |
|
798 |
buf.position(buf.limit()); |
|
799 |
buf.limit(buf.capacity()); |
|
800 |
||
801 |
int n = 0; |
|
802 |
try { |
|
803 |
n = source.read(buf); |
|
804 |
} catch (IOException ioe) { |
|
805 |
lastException = ioe; |
|
806 |
n = -1; |
|
807 |
} |
|
808 |
if (n == -1) { |
|
809 |
sourceClosed = true; |
|
810 |
needInput = false; |
|
811 |
} |
|
812 |
if (n > 0) |
|
813 |
needInput = false; |
|
814 |
// Restore current position and limit for reading |
|
815 |
buf.limit(buf.position()); |
|
816 |
buf.position(p); |
|
817 |
} |
|
818 |
||
819 |
// After this method is called there will either be an exception |
|
820 |
// or else there will be space in the buffer |
|
821 |
private boolean makeSpace() { |
|
822 |
clearCaches(); |
|
823 |
int offset = savedScannerPosition == -1 ? |
|
824 |
position : savedScannerPosition; |
|
825 |
buf.position(offset); |
|
826 |
// Gain space by compacting buffer |
|
827 |
if (offset > 0) { |
|
828 |
buf.compact(); |
|
829 |
translateSavedIndexes(offset); |
|
830 |
position -= offset; |
|
831 |
buf.flip(); |
|
832 |
return true; |
|
833 |
} |
|
834 |
// Gain space by growing buffer |
|
835 |
int newSize = buf.capacity() * 2; |
|
836 |
CharBuffer newBuf = CharBuffer.allocate(newSize); |
|
837 |
newBuf.put(buf); |
|
838 |
newBuf.flip(); |
|
839 |
translateSavedIndexes(offset); |
|
840 |
position -= offset; |
|
841 |
buf = newBuf; |
|
842 |
matcher.reset(buf); |
|
843 |
return true; |
|
844 |
} |
|
845 |
||
846 |
// When a buffer compaction/reallocation occurs the saved indexes must |
|
847 |
// be modified appropriately |
|
848 |
private void translateSavedIndexes(int offset) { |
|
849 |
if (savedScannerPosition != -1) |
|
850 |
savedScannerPosition -= offset; |
|
851 |
} |
|
852 |
||
853 |
// If we are at the end of input then NoSuchElement; |
|
854 |
// If there is still input left then InputMismatch |
|
855 |
private void throwFor() { |
|
856 |
skipped = false; |
|
857 |
if ((sourceClosed) && (position == buf.limit())) |
|
858 |
throw new NoSuchElementException(); |
|
859 |
else |
|
860 |
throw new InputMismatchException(); |
|
861 |
} |
|
862 |
||
863 |
// Returns true if a complete token or partial token is in the buffer. |
|
864 |
// It is not necessary to find a complete token since a partial token |
|
865 |
// means that there will be another token with or without more input. |
|
866 |
private boolean hasTokenInBuffer() { |
|
867 |
matchValid = false; |
|
868 |
matcher.usePattern(delimPattern); |
|
869 |
matcher.region(position, buf.limit()); |
|
870 |
// Skip delims first |
|
38953
2cd777b7c655
8139414: java.util.Scanner hasNext() returns true, next() throws NoSuchElementException
sherman
parents:
35787
diff
changeset
|
871 |
if (matcher.lookingAt()) { |
2cd777b7c655
8139414: java.util.Scanner hasNext() returns true, next() throws NoSuchElementException
sherman
parents:
35787
diff
changeset
|
872 |
if (matcher.hitEnd() && !sourceClosed) { |
2cd777b7c655
8139414: java.util.Scanner hasNext() returns true, next() throws NoSuchElementException
sherman
parents:
35787
diff
changeset
|
873 |
// more input might change the match of delims, in which |
2cd777b7c655
8139414: java.util.Scanner hasNext() returns true, next() throws NoSuchElementException
sherman
parents:
35787
diff
changeset
|
874 |
// might change whether or not if there is token left in |
2cd777b7c655
8139414: java.util.Scanner hasNext() returns true, next() throws NoSuchElementException
sherman
parents:
35787
diff
changeset
|
875 |
// buffer (don't update the "position" in this case) |
2cd777b7c655
8139414: java.util.Scanner hasNext() returns true, next() throws NoSuchElementException
sherman
parents:
35787
diff
changeset
|
876 |
needInput = true; |
2cd777b7c655
8139414: java.util.Scanner hasNext() returns true, next() throws NoSuchElementException
sherman
parents:
35787
diff
changeset
|
877 |
return false; |
2cd777b7c655
8139414: java.util.Scanner hasNext() returns true, next() throws NoSuchElementException
sherman
parents:
35787
diff
changeset
|
878 |
} |
2 | 879 |
position = matcher.end(); |
38953
2cd777b7c655
8139414: java.util.Scanner hasNext() returns true, next() throws NoSuchElementException
sherman
parents:
35787
diff
changeset
|
880 |
} |
2 | 881 |
// If we are sitting at the end, no more tokens in buffer |
882 |
if (position == buf.limit()) |
|
883 |
return false; |
|
884 |
return true; |
|
885 |
} |
|
886 |
||
887 |
/* |
|
888 |
* Returns a "complete token" that matches the specified pattern |
|
889 |
* |
|
890 |
* A token is complete if surrounded by delims; a partial token |
|
891 |
* is prefixed by delims but not postfixed by them |
|
892 |
* |
|
893 |
* The position is advanced to the end of that complete token |
|
894 |
* |
|
895 |
* Pattern == null means accept any token at all |
|
896 |
* |
|
897 |
* Triple return: |
|
898 |
* 1. valid string means it was found |
|
899 |
* 2. null with needInput=false means we won't ever find it |
|
900 |
* 3. null with needInput=true means try again after readInput |
|
901 |
*/ |
|
902 |
private String getCompleteTokenInBuffer(Pattern pattern) { |
|
903 |
matchValid = false; |
|
904 |
// Skip delims first |
|
905 |
matcher.usePattern(delimPattern); |
|
906 |
if (!skipped) { // Enforcing only one skip of leading delims |
|
907 |
matcher.region(position, buf.limit()); |
|
908 |
if (matcher.lookingAt()) { |
|
909 |
// If more input could extend the delimiters then we must wait |
|
910 |
// for more input |
|
911 |
if (matcher.hitEnd() && !sourceClosed) { |
|
912 |
needInput = true; |
|
913 |
return null; |
|
914 |
} |
|
915 |
// The delims were whole and the matcher should skip them |
|
916 |
skipped = true; |
|
917 |
position = matcher.end(); |
|
918 |
} |
|
919 |
} |
|
920 |
||
921 |
// If we are sitting at the end, no more tokens in buffer |
|
922 |
if (position == buf.limit()) { |
|
923 |
if (sourceClosed) |
|
924 |
return null; |
|
925 |
needInput = true; |
|
926 |
return null; |
|
927 |
} |
|
928 |
// Must look for next delims. Simply attempting to match the |
|
929 |
// pattern at this point may find a match but it might not be |
|
930 |
// the first longest match because of missing input, or it might |
|
931 |
// match a partial token instead of the whole thing. |
|
932 |
||
933 |
// Then look for next delims |
|
934 |
matcher.region(position, buf.limit()); |
|
935 |
boolean foundNextDelim = matcher.find(); |
|
936 |
if (foundNextDelim && (matcher.end() == position)) { |
|
937 |
// Zero length delimiter match; we should find the next one |
|
938 |
// using the automatic advance past a zero length match; |
|
939 |
// Otherwise we have just found the same one we just skipped |
|
940 |
foundNextDelim = matcher.find(); |
|
941 |
} |
|
942 |
if (foundNextDelim) { |
|
39141
e5d52546ba3a
8159545: closed/java/io/Console/TestConsole.java failed with exit code 1
sherman
parents:
38953
diff
changeset
|
943 |
// In the rare case that more input could cause the match |
e5d52546ba3a
8159545: closed/java/io/Console/TestConsole.java failed with exit code 1
sherman
parents:
38953
diff
changeset
|
944 |
// to be lost and there is more input coming we must wait |
e5d52546ba3a
8159545: closed/java/io/Console/TestConsole.java failed with exit code 1
sherman
parents:
38953
diff
changeset
|
945 |
// for more input. Note that hitting the end is okay as long |
e5d52546ba3a
8159545: closed/java/io/Console/TestConsole.java failed with exit code 1
sherman
parents:
38953
diff
changeset
|
946 |
// as the match cannot go away. It is the beginning of the |
e5d52546ba3a
8159545: closed/java/io/Console/TestConsole.java failed with exit code 1
sherman
parents:
38953
diff
changeset
|
947 |
// next delims we want to be sure about, we don't care if |
e5d52546ba3a
8159545: closed/java/io/Console/TestConsole.java failed with exit code 1
sherman
parents:
38953
diff
changeset
|
948 |
// they potentially extend further. |
e5d52546ba3a
8159545: closed/java/io/Console/TestConsole.java failed with exit code 1
sherman
parents:
38953
diff
changeset
|
949 |
if (matcher.requireEnd() && !sourceClosed) { |
2 | 950 |
needInput = true; |
951 |
return null; |
|
952 |
} |
|
953 |
int tokenEnd = matcher.start(); |
|
954 |
// There is a complete token. |
|
955 |
if (pattern == null) { |
|
956 |
// Must continue with match to provide valid MatchResult |
|
957 |
pattern = FIND_ANY_PATTERN; |
|
958 |
} |
|
959 |
// Attempt to match against the desired pattern |
|
960 |
matcher.usePattern(pattern); |
|
961 |
matcher.region(position, tokenEnd); |
|
962 |
if (matcher.matches()) { |
|
963 |
String s = matcher.group(); |
|
964 |
position = matcher.end(); |
|
965 |
return s; |
|
966 |
} else { // Complete token but it does not match |
|
967 |
return null; |
|
968 |
} |
|
969 |
} |
|
970 |
||
971 |
// If we can't find the next delims but no more input is coming, |
|
972 |
// then we can treat the remainder as a whole token |
|
973 |
if (sourceClosed) { |
|
974 |
if (pattern == null) { |
|
975 |
// Must continue with match to provide valid MatchResult |
|
976 |
pattern = FIND_ANY_PATTERN; |
|
977 |
} |
|
978 |
// Last token; Match the pattern here or throw |
|
979 |
matcher.usePattern(pattern); |
|
980 |
matcher.region(position, buf.limit()); |
|
981 |
if (matcher.matches()) { |
|
982 |
String s = matcher.group(); |
|
983 |
position = matcher.end(); |
|
984 |
return s; |
|
985 |
} |
|
986 |
// Last piece does not match |
|
987 |
return null; |
|
988 |
} |
|
989 |
||
990 |
// There is a partial token in the buffer; must read more |
|
991 |
// to complete it |
|
992 |
needInput = true; |
|
993 |
return null; |
|
994 |
} |
|
995 |
||
996 |
// Finds the specified pattern in the buffer up to horizon. |
|
32650 | 997 |
// Returns true if the specified input pattern was matched, |
998 |
// and leaves the matcher field with the current match state. |
|
999 |
private boolean findPatternInBuffer(Pattern pattern, int horizon) { |
|
2 | 1000 |
matchValid = false; |
1001 |
matcher.usePattern(pattern); |
|
1002 |
int bufferLimit = buf.limit(); |
|
1003 |
int horizonLimit = -1; |
|
1004 |
int searchLimit = bufferLimit; |
|
1005 |
if (horizon > 0) { |
|
1006 |
horizonLimit = position + horizon; |
|
1007 |
if (horizonLimit < bufferLimit) |
|
1008 |
searchLimit = horizonLimit; |
|
1009 |
} |
|
1010 |
matcher.region(position, searchLimit); |
|
1011 |
if (matcher.find()) { |
|
1012 |
if (matcher.hitEnd() && (!sourceClosed)) { |
|
1013 |
// The match may be longer if didn't hit horizon or real end |
|
1014 |
if (searchLimit != horizonLimit) { |
|
1015 |
// Hit an artificial end; try to extend the match |
|
1016 |
needInput = true; |
|
32650 | 1017 |
return false; |
2 | 1018 |
} |
1019 |
// The match could go away depending on what is next |
|
1020 |
if ((searchLimit == horizonLimit) && matcher.requireEnd()) { |
|
1021 |
// Rare case: we hit the end of input and it happens |
|
1022 |
// that it is at the horizon and the end of input is |
|
1023 |
// required for the match. |
|
1024 |
needInput = true; |
|
32650 | 1025 |
return false; |
2 | 1026 |
} |
1027 |
} |
|
1028 |
// Did not hit end, or hit real end, or hit horizon |
|
1029 |
position = matcher.end(); |
|
32650 | 1030 |
return true; |
2 | 1031 |
} |
1032 |
||
1033 |
if (sourceClosed) |
|
32650 | 1034 |
return false; |
2 | 1035 |
|
1036 |
// If there is no specified horizon, or if we have not searched |
|
1037 |
// to the specified horizon yet, get more input |
|
1038 |
if ((horizon == 0) || (searchLimit != horizonLimit)) |
|
1039 |
needInput = true; |
|
32650 | 1040 |
return false; |
2 | 1041 |
} |
1042 |
||
32650 | 1043 |
// Attempts to match a pattern anchored at the current position. |
1044 |
// Returns true if the specified input pattern was matched, |
|
1045 |
// and leaves the matcher field with the current match state. |
|
1046 |
private boolean matchPatternInBuffer(Pattern pattern) { |
|
2 | 1047 |
matchValid = false; |
1048 |
matcher.usePattern(pattern); |
|
1049 |
matcher.region(position, buf.limit()); |
|
1050 |
if (matcher.lookingAt()) { |
|
1051 |
if (matcher.hitEnd() && (!sourceClosed)) { |
|
1052 |
// Get more input and try again |
|
1053 |
needInput = true; |
|
32650 | 1054 |
return false; |
2 | 1055 |
} |
1056 |
position = matcher.end(); |
|
32650 | 1057 |
return true; |
2 | 1058 |
} |
1059 |
||
1060 |
if (sourceClosed) |
|
32650 | 1061 |
return false; |
2 | 1062 |
|
1063 |
// Read more to find pattern |
|
1064 |
needInput = true; |
|
32650 | 1065 |
return false; |
2 | 1066 |
} |
1067 |
||
1068 |
// Throws if the scanner is closed |
|
1069 |
private void ensureOpen() { |
|
1070 |
if (closed) |
|
1071 |
throw new IllegalStateException("Scanner closed"); |
|
1072 |
} |
|
1073 |
||
1074 |
// Public methods |
|
1075 |
||
1076 |
/** |
|
1077 |
* Closes this scanner. |
|
1078 |
* |
|
1079 |
* <p> If this scanner has not yet been closed then if its underlying |
|
1080 |
* {@linkplain java.lang.Readable readable} also implements the {@link |
|
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|
1081 |
* java.io.Closeable} interface then the readable's {@code close} method |
2 | 1082 |
* will be invoked. If this scanner is already closed then invoking this |
1083 |
* method will have no effect. |
|
1084 |
* |
|
1085 |
* <p>Attempting to perform search operations after a scanner has |
|
1086 |
* been closed will result in an {@link IllegalStateException}. |
|
1087 |
* |
|
1088 |
*/ |
|
1089 |
public void close() { |
|
1090 |
if (closed) |
|
1091 |
return; |
|
1092 |
if (source instanceof Closeable) { |
|
1093 |
try { |
|
1094 |
((Closeable)source).close(); |
|
1095 |
} catch (IOException ioe) { |
|
1096 |
lastException = ioe; |
|
1097 |
} |
|
1098 |
} |
|
1099 |
sourceClosed = true; |
|
1100 |
source = null; |
|
1101 |
closed = true; |
|
1102 |
} |
|
1103 |
||
1104 |
/** |
|
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|
1105 |
* Returns the {@code IOException} last thrown by this |
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|
1106 |
* {@code Scanner}'s underlying {@code Readable}. This method |
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|
1107 |
* returns {@code null} if no such exception exists. |
2 | 1108 |
* |
1109 |
* @return the last exception thrown by this scanner's readable |
|
1110 |
*/ |
|
1111 |
public IOException ioException() { |
|
1112 |
return lastException; |
|
1113 |
} |
|
1114 |
||
1115 |
/** |
|
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|
1116 |
* Returns the {@code Pattern} this {@code Scanner} is currently |
2 | 1117 |
* using to match delimiters. |
1118 |
* |
|
1119 |
* @return this scanner's delimiting pattern. |
|
1120 |
*/ |
|
1121 |
public Pattern delimiter() { |
|
1122 |
return delimPattern; |
|
1123 |
} |
|
1124 |
||
1125 |
/** |
|
1126 |
* Sets this scanner's delimiting pattern to the specified pattern. |
|
1127 |
* |
|
1128 |
* @param pattern A delimiting pattern |
|
1129 |
* @return this scanner |
|
1130 |
*/ |
|
1131 |
public Scanner useDelimiter(Pattern pattern) { |
|
32650 | 1132 |
modCount++; |
2 | 1133 |
delimPattern = pattern; |
1134 |
return this; |
|
1135 |
} |
|
1136 |
||
1137 |
/** |
|
1138 |
* Sets this scanner's delimiting pattern to a pattern constructed from |
|
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|
1139 |
* the specified {@code String}. |
2 | 1140 |
* |
1141 |
* <p> An invocation of this method of the form |
|
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|
1142 |
* {@code useDelimiter(pattern)} behaves in exactly the same way as the |
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changeset
|
1143 |
* invocation {@code useDelimiter(Pattern.compile(pattern))}. |
2 | 1144 |
* |
1145 |
* <p> Invoking the {@link #reset} method will set the scanner's delimiter |
|
1146 |
* to the <a href= "#default-delimiter">default</a>. |
|
1147 |
* |
|
1148 |
* @param pattern A string specifying a delimiting pattern |
|
1149 |
* @return this scanner |
|
1150 |
*/ |
|
1151 |
public Scanner useDelimiter(String pattern) { |
|
32650 | 1152 |
modCount++; |
2 | 1153 |
delimPattern = patternCache.forName(pattern); |
1154 |
return this; |
|
1155 |
} |
|
1156 |
||
1157 |
/** |
|
1158 |
* Returns this scanner's locale. |
|
1159 |
* |
|
1160 |
* <p>A scanner's locale affects many elements of its default |
|
1161 |
* primitive matching regular expressions; see |
|
1162 |
* <a href= "#localized-numbers">localized numbers</a> above. |
|
1163 |
* |
|
1164 |
* @return this scanner's locale |
|
1165 |
*/ |
|
1166 |
public Locale locale() { |
|
1167 |
return this.locale; |
|
1168 |
} |
|
1169 |
||
1170 |
/** |
|
1171 |
* Sets this scanner's locale to the specified locale. |
|
1172 |
* |
|
1173 |
* <p>A scanner's locale affects many elements of its default |
|
1174 |
* primitive matching regular expressions; see |
|
1175 |
* <a href= "#localized-numbers">localized numbers</a> above. |
|
1176 |
* |
|
1177 |
* <p>Invoking the {@link #reset} method will set the scanner's locale to |
|
1178 |
* the <a href= "#initial-locale">initial locale</a>. |
|
1179 |
* |
|
1180 |
* @param locale A string specifying the locale to use |
|
1181 |
* @return this scanner |
|
1182 |
*/ |
|
1183 |
public Scanner useLocale(Locale locale) { |
|
1184 |
if (locale.equals(this.locale)) |
|
1185 |
return this; |
|
1186 |
||
32650 | 1187 |
modCount++; |
2 | 1188 |
this.locale = locale; |
1189 |
DecimalFormat df = |
|
1190 |
(DecimalFormat)NumberFormat.getNumberInstance(locale); |
|
1191 |
DecimalFormatSymbols dfs = DecimalFormatSymbols.getInstance(locale); |
|
1192 |
||
1193 |
// These must be literalized to avoid collision with regex |
|
1194 |
// metacharacters such as dot or parenthesis |
|
1195 |
groupSeparator = "\\" + dfs.getGroupingSeparator(); |
|
1196 |
decimalSeparator = "\\" + dfs.getDecimalSeparator(); |
|
1197 |
||
1198 |
// Quoting the nonzero length locale-specific things |
|
1199 |
// to avoid potential conflict with metacharacters |
|
1200 |
nanString = "\\Q" + dfs.getNaN() + "\\E"; |
|
1201 |
infinityString = "\\Q" + dfs.getInfinity() + "\\E"; |
|
1202 |
positivePrefix = df.getPositivePrefix(); |
|
1203 |
if (positivePrefix.length() > 0) |
|
1204 |
positivePrefix = "\\Q" + positivePrefix + "\\E"; |
|
1205 |
negativePrefix = df.getNegativePrefix(); |
|
1206 |
if (negativePrefix.length() > 0) |
|
1207 |
negativePrefix = "\\Q" + negativePrefix + "\\E"; |
|
1208 |
positiveSuffix = df.getPositiveSuffix(); |
|
1209 |
if (positiveSuffix.length() > 0) |
|
1210 |
positiveSuffix = "\\Q" + positiveSuffix + "\\E"; |
|
1211 |
negativeSuffix = df.getNegativeSuffix(); |
|
1212 |
if (negativeSuffix.length() > 0) |
|
1213 |
negativeSuffix = "\\Q" + negativeSuffix + "\\E"; |
|
1214 |
||
1215 |
// Force rebuilding and recompilation of locale dependent |
|
1216 |
// primitive patterns |
|
1217 |
integerPattern = null; |
|
1218 |
floatPattern = null; |
|
1219 |
||
1220 |
return this; |
|
1221 |
} |
|
1222 |
||
1223 |
/** |
|
1224 |
* Returns this scanner's default radix. |
|
1225 |
* |
|
1226 |
* <p>A scanner's radix affects elements of its default |
|
1227 |
* number matching regular expressions; see |
|
1228 |
* <a href= "#localized-numbers">localized numbers</a> above. |
|
1229 |
* |
|
1230 |
* @return the default radix of this scanner |
|
1231 |
*/ |
|
1232 |
public int radix() { |
|
1233 |
return this.defaultRadix; |
|
1234 |
} |
|
1235 |
||
1236 |
/** |
|
1237 |
* Sets this scanner's default radix to the specified radix. |
|
1238 |
* |
|
1239 |
* <p>A scanner's radix affects elements of its default |
|
1240 |
* number matching regular expressions; see |
|
1241 |
* <a href= "#localized-numbers">localized numbers</a> above. |
|
1242 |
* |
|
32650 | 1243 |
* <p>If the radix is less than {@link Character#MIN_RADIX Character.MIN_RADIX} |
1244 |
* or greater than {@link Character#MAX_RADIX Character.MAX_RADIX}, then an |
|
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|
1245 |
* {@code IllegalArgumentException} is thrown. |
2 | 1246 |
* |
1247 |
* <p>Invoking the {@link #reset} method will set the scanner's radix to |
|
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|
1248 |
* {@code 10}. |
2 | 1249 |
* |
1250 |
* @param radix The radix to use when scanning numbers |
|
1251 |
* @return this scanner |
|
1252 |
* @throws IllegalArgumentException if radix is out of range |
|
1253 |
*/ |
|
1254 |
public Scanner useRadix(int radix) { |
|
1255 |
if ((radix < Character.MIN_RADIX) || (radix > Character.MAX_RADIX)) |
|
1256 |
throw new IllegalArgumentException("radix:"+radix); |
|
1257 |
||
1258 |
if (this.defaultRadix == radix) |
|
1259 |
return this; |
|
32650 | 1260 |
modCount++; |
2 | 1261 |
this.defaultRadix = radix; |
1262 |
// Force rebuilding and recompilation of radix dependent patterns |
|
1263 |
integerPattern = null; |
|
1264 |
return this; |
|
1265 |
} |
|
1266 |
||
1267 |
// The next operation should occur in the specified radix but |
|
1268 |
// the default is left untouched. |
|
1269 |
private void setRadix(int radix) { |
|
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
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changeset
|
1270 |
if ((radix < Character.MIN_RADIX) || (radix > Character.MAX_RADIX)) |
ebb396875090
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changeset
|
1271 |
throw new IllegalArgumentException("radix:"+radix); |
ebb396875090
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changeset
|
1272 |
|
2 | 1273 |
if (this.radix != radix) { |
1274 |
// Force rebuilding and recompilation of radix dependent patterns |
|
1275 |
integerPattern = null; |
|
1276 |
this.radix = radix; |
|
1277 |
} |
|
1278 |
} |
|
1279 |
||
1280 |
/** |
|
1281 |
* Returns the match result of the last scanning operation performed |
|
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changeset
|
1282 |
* by this scanner. This method throws {@code IllegalStateException} |
2 | 1283 |
* if no match has been performed, or if the last match was |
1284 |
* not successful. |
|
1285 |
* |
|
32650 | 1286 |
* <p>The various {@code next} methods of {@code Scanner} |
2 | 1287 |
* make a match result available if they complete without throwing an |
1288 |
* exception. For instance, after an invocation of the {@link #nextInt} |
|
1289 |
* method that returned an int, this method returns a |
|
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|
1290 |
* {@code MatchResult} for the search of the |
2 | 1291 |
* <a href="#Integer-regex"><i>Integer</i></a> regular expression |
32650 | 1292 |
* defined above. Similarly the {@link #findInLine findInLine()}, |
1293 |
* {@link #findWithinHorizon findWithinHorizon()}, and {@link #skip skip()} |
|
1294 |
* methods will make a match available if they succeed. |
|
2 | 1295 |
* |
1296 |
* @return a match result for the last match operation |
|
1297 |
* @throws IllegalStateException If no match result is available |
|
1298 |
*/ |
|
1299 |
public MatchResult match() { |
|
1300 |
if (!matchValid) |
|
1301 |
throw new IllegalStateException("No match result available"); |
|
1302 |
return matcher.toMatchResult(); |
|
1303 |
} |
|
1304 |
||
1305 |
/** |
|
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changeset
|
1306 |
* <p>Returns the string representation of this {@code Scanner}. The |
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changeset
|
1307 |
* string representation of a {@code Scanner} contains information |
2 | 1308 |
* that may be useful for debugging. The exact format is unspecified. |
1309 |
* |
|
1310 |
* @return The string representation of this scanner |
|
1311 |
*/ |
|
1312 |
public String toString() { |
|
1313 |
StringBuilder sb = new StringBuilder(); |
|
1314 |
sb.append("java.util.Scanner"); |
|
1315 |
sb.append("[delimiters=" + delimPattern + "]"); |
|
1316 |
sb.append("[position=" + position + "]"); |
|
1317 |
sb.append("[match valid=" + matchValid + "]"); |
|
1318 |
sb.append("[need input=" + needInput + "]"); |
|
1319 |
sb.append("[source closed=" + sourceClosed + "]"); |
|
1320 |
sb.append("[skipped=" + skipped + "]"); |
|
1321 |
sb.append("[group separator=" + groupSeparator + "]"); |
|
1322 |
sb.append("[decimal separator=" + decimalSeparator + "]"); |
|
1323 |
sb.append("[positive prefix=" + positivePrefix + "]"); |
|
1324 |
sb.append("[negative prefix=" + negativePrefix + "]"); |
|
1325 |
sb.append("[positive suffix=" + positiveSuffix + "]"); |
|
1326 |
sb.append("[negative suffix=" + negativeSuffix + "]"); |
|
1327 |
sb.append("[NaN string=" + nanString + "]"); |
|
1328 |
sb.append("[infinity string=" + infinityString + "]"); |
|
1329 |
return sb.toString(); |
|
1330 |
} |
|
1331 |
||
1332 |
/** |
|
1333 |
* Returns true if this scanner has another token in its input. |
|
1334 |
* This method may block while waiting for input to scan. |
|
1335 |
* The scanner does not advance past any input. |
|
1336 |
* |
|
1337 |
* @return true if and only if this scanner has another token |
|
1338 |
* @throws IllegalStateException if this scanner is closed |
|
1339 |
* @see java.util.Iterator |
|
1340 |
*/ |
|
1341 |
public boolean hasNext() { |
|
1342 |
ensureOpen(); |
|
1343 |
saveState(); |
|
32650 | 1344 |
modCount++; |
2 | 1345 |
while (!sourceClosed) { |
38953
2cd777b7c655
8139414: java.util.Scanner hasNext() returns true, next() throws NoSuchElementException
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35787
diff
changeset
|
1346 |
if (hasTokenInBuffer()) { |
2 | 1347 |
return revertState(true); |
38953
2cd777b7c655
8139414: java.util.Scanner hasNext() returns true, next() throws NoSuchElementException
sherman
parents:
35787
diff
changeset
|
1348 |
} |
2 | 1349 |
readInput(); |
1350 |
} |
|
1351 |
boolean result = hasTokenInBuffer(); |
|
1352 |
return revertState(result); |
|
1353 |
} |
|
1354 |
||
1355 |
/** |
|
1356 |
* Finds and returns the next complete token from this scanner. |
|
1357 |
* A complete token is preceded and followed by input that matches |
|
1358 |
* the delimiter pattern. This method may block while waiting for input |
|
1359 |
* to scan, even if a previous invocation of {@link #hasNext} returned |
|
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changeset
|
1360 |
* {@code true}. |
2 | 1361 |
* |
1362 |
* @return the next token |
|
1363 |
* @throws NoSuchElementException if no more tokens are available |
|
1364 |
* @throws IllegalStateException if this scanner is closed |
|
1365 |
* @see java.util.Iterator |
|
1366 |
*/ |
|
1367 |
public String next() { |
|
1368 |
ensureOpen(); |
|
1369 |
clearCaches(); |
|
32650 | 1370 |
modCount++; |
2 | 1371 |
while (true) { |
1372 |
String token = getCompleteTokenInBuffer(null); |
|
1373 |
if (token != null) { |
|
1374 |
matchValid = true; |
|
1375 |
skipped = false; |
|
1376 |
return token; |
|
1377 |
} |
|
1378 |
if (needInput) |
|
1379 |
readInput(); |
|
1380 |
else |
|
1381 |
throwFor(); |
|
1382 |
} |
|
1383 |
} |
|
1384 |
||
1385 |
/** |
|
1386 |
* The remove operation is not supported by this implementation of |
|
32108
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changeset
|
1387 |
* {@code Iterator}. |
2 | 1388 |
* |
1389 |
* @throws UnsupportedOperationException if this method is invoked. |
|
1390 |
* @see java.util.Iterator |
|
1391 |
*/ |
|
1392 |
public void remove() { |
|
1393 |
throw new UnsupportedOperationException(); |
|
1394 |
} |
|
1395 |
||
1396 |
/** |
|
1397 |
* Returns true if the next token matches the pattern constructed from the |
|
1398 |
* specified string. The scanner does not advance past any input. |
|
1399 |
* |
|
32108
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changeset
|
1400 |
* <p> An invocation of this method of the form {@code hasNext(pattern)} |
2 | 1401 |
* behaves in exactly the same way as the invocation |
32108
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diff
changeset
|
1402 |
* {@code hasNext(Pattern.compile(pattern))}. |
2 | 1403 |
* |
1404 |
* @param pattern a string specifying the pattern to scan |
|
1405 |
* @return true if and only if this scanner has another token matching |
|
1406 |
* the specified pattern |
|
1407 |
* @throws IllegalStateException if this scanner is closed |
|
1408 |
*/ |
|
1409 |
public boolean hasNext(String pattern) { |
|
1410 |
return hasNext(patternCache.forName(pattern)); |
|
1411 |
} |
|
1412 |
||
1413 |
/** |
|
1414 |
* Returns the next token if it matches the pattern constructed from the |
|
1415 |
* specified string. If the match is successful, the scanner advances |
|
1416 |
* past the input that matched the pattern. |
|
1417 |
* |
|
32108
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diff
changeset
|
1418 |
* <p> An invocation of this method of the form {@code next(pattern)} |
2 | 1419 |
* behaves in exactly the same way as the invocation |
32108
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changeset
|
1420 |
* {@code next(Pattern.compile(pattern))}. |
2 | 1421 |
* |
1422 |
* @param pattern a string specifying the pattern to scan |
|
1423 |
* @return the next token |
|
1424 |
* @throws NoSuchElementException if no such tokens are available |
|
1425 |
* @throws IllegalStateException if this scanner is closed |
|
1426 |
*/ |
|
1427 |
public String next(String pattern) { |
|
1428 |
return next(patternCache.forName(pattern)); |
|
1429 |
} |
|
1430 |
||
1431 |
/** |
|
1432 |
* Returns true if the next complete token matches the specified pattern. |
|
1433 |
* A complete token is prefixed and postfixed by input that matches |
|
1434 |
* the delimiter pattern. This method may block while waiting for input. |
|
1435 |
* The scanner does not advance past any input. |
|
1436 |
* |
|
1437 |
* @param pattern the pattern to scan for |
|
1438 |
* @return true if and only if this scanner has another token matching |
|
1439 |
* the specified pattern |
|
1440 |
* @throws IllegalStateException if this scanner is closed |
|
1441 |
*/ |
|
1442 |
public boolean hasNext(Pattern pattern) { |
|
1443 |
ensureOpen(); |
|
1444 |
if (pattern == null) |
|
1445 |
throw new NullPointerException(); |
|
1446 |
hasNextPattern = null; |
|
1447 |
saveState(); |
|
32650 | 1448 |
modCount++; |
2 | 1449 |
|
1450 |
while (true) { |
|
1451 |
if (getCompleteTokenInBuffer(pattern) != null) { |
|
1452 |
matchValid = true; |
|
1453 |
cacheResult(); |
|
1454 |
return revertState(true); |
|
1455 |
} |
|
1456 |
if (needInput) |
|
1457 |
readInput(); |
|
1458 |
else |
|
1459 |
return revertState(false); |
|
1460 |
} |
|
1461 |
} |
|
1462 |
||
1463 |
/** |
|
1464 |
* Returns the next token if it matches the specified pattern. This |
|
1465 |
* method may block while waiting for input to scan, even if a previous |
|
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diff
changeset
|
1466 |
* invocation of {@link #hasNext(Pattern)} returned {@code true}. |
2 | 1467 |
* If the match is successful, the scanner advances past the input that |
1468 |
* matched the pattern. |
|
1469 |
* |
|
1470 |
* @param pattern the pattern to scan for |
|
1471 |
* @return the next token |
|
1472 |
* @throws NoSuchElementException if no more tokens are available |
|
1473 |
* @throws IllegalStateException if this scanner is closed |
|
1474 |
*/ |
|
1475 |
public String next(Pattern pattern) { |
|
1476 |
ensureOpen(); |
|
1477 |
if (pattern == null) |
|
1478 |
throw new NullPointerException(); |
|
1479 |
||
32650 | 1480 |
modCount++; |
2 | 1481 |
// Did we already find this pattern? |
1482 |
if (hasNextPattern == pattern) |
|
1483 |
return getCachedResult(); |
|
1484 |
clearCaches(); |
|
1485 |
||
1486 |
// Search for the pattern |
|
1487 |
while (true) { |
|
1488 |
String token = getCompleteTokenInBuffer(pattern); |
|
1489 |
if (token != null) { |
|
1490 |
matchValid = true; |
|
1491 |
skipped = false; |
|
1492 |
return token; |
|
1493 |
} |
|
1494 |
if (needInput) |
|
1495 |
readInput(); |
|
1496 |
else |
|
1497 |
throwFor(); |
|
1498 |
} |
|
1499 |
} |
|
1500 |
||
1501 |
/** |
|
1502 |
* Returns true if there is another line in the input of this scanner. |
|
1503 |
* This method may block while waiting for input. The scanner does not |
|
1504 |
* advance past any input. |
|
1505 |
* |
|
1506 |
* @return true if and only if this scanner has another line of input |
|
1507 |
* @throws IllegalStateException if this scanner is closed |
|
1508 |
*/ |
|
1509 |
public boolean hasNextLine() { |
|
1510 |
saveState(); |
|
1511 |
||
32650 | 1512 |
modCount++; |
2 | 1513 |
String result = findWithinHorizon(linePattern(), 0); |
1514 |
if (result != null) { |
|
1515 |
MatchResult mr = this.match(); |
|
1516 |
String lineSep = mr.group(1); |
|
1517 |
if (lineSep != null) { |
|
1518 |
result = result.substring(0, result.length() - |
|
1519 |
lineSep.length()); |
|
1520 |
cacheResult(result); |
|
1521 |
||
1522 |
} else { |
|
1523 |
cacheResult(); |
|
1524 |
} |
|
1525 |
} |
|
1526 |
revertState(); |
|
1527 |
return (result != null); |
|
1528 |
} |
|
1529 |
||
1530 |
/** |
|
1531 |
* Advances this scanner past the current line and returns the input |
|
1532 |
* that was skipped. |
|
1533 |
* |
|
1534 |
* This method returns the rest of the current line, excluding any line |
|
1535 |
* separator at the end. The position is set to the beginning of the next |
|
1536 |
* line. |
|
1537 |
* |
|
1538 |
* <p>Since this method continues to search through the input looking |
|
1539 |
* for a line separator, it may buffer all of the input searching for |
|
1540 |
* the line to skip if no line separators are present. |
|
1541 |
* |
|
1542 |
* @return the line that was skipped |
|
1543 |
* @throws NoSuchElementException if no line was found |
|
1544 |
* @throws IllegalStateException if this scanner is closed |
|
1545 |
*/ |
|
1546 |
public String nextLine() { |
|
32650 | 1547 |
modCount++; |
2 | 1548 |
if (hasNextPattern == linePattern()) |
1549 |
return getCachedResult(); |
|
1550 |
clearCaches(); |
|
1551 |
||
1552 |
String result = findWithinHorizon(linePattern, 0); |
|
1553 |
if (result == null) |
|
1554 |
throw new NoSuchElementException("No line found"); |
|
1555 |
MatchResult mr = this.match(); |
|
1556 |
String lineSep = mr.group(1); |
|
1557 |
if (lineSep != null) |
|
1558 |
result = result.substring(0, result.length() - lineSep.length()); |
|
1559 |
if (result == null) |
|
1560 |
throw new NoSuchElementException(); |
|
1561 |
else |
|
1562 |
return result; |
|
1563 |
} |
|
1564 |
||
1565 |
// Public methods that ignore delimiters |
|
1566 |
||
1567 |
/** |
|
1568 |
* Attempts to find the next occurrence of a pattern constructed from the |
|
1569 |
* specified string, ignoring delimiters. |
|
1570 |
* |
|
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changeset
|
1571 |
* <p>An invocation of this method of the form {@code findInLine(pattern)} |
2 | 1572 |
* behaves in exactly the same way as the invocation |
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changeset
|
1573 |
* {@code findInLine(Pattern.compile(pattern))}. |
2 | 1574 |
* |
1575 |
* @param pattern a string specifying the pattern to search for |
|
1576 |
* @return the text that matched the specified pattern |
|
1577 |
* @throws IllegalStateException if this scanner is closed |
|
1578 |
*/ |
|
1579 |
public String findInLine(String pattern) { |
|
1580 |
return findInLine(patternCache.forName(pattern)); |
|
1581 |
} |
|
1582 |
||
1583 |
/** |
|
1584 |
* Attempts to find the next occurrence of the specified pattern ignoring |
|
1585 |
* delimiters. If the pattern is found before the next line separator, the |
|
1586 |
* scanner advances past the input that matched and returns the string that |
|
1587 |
* matched the pattern. |
|
1588 |
* If no such pattern is detected in the input up to the next line |
|
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diff
changeset
|
1589 |
* separator, then {@code null} is returned and the scanner's |
2 | 1590 |
* position is unchanged. This method may block waiting for input that |
1591 |
* matches the pattern. |
|
1592 |
* |
|
1593 |
* <p>Since this method continues to search through the input looking |
|
1594 |
* for the specified pattern, it may buffer all of the input searching for |
|
1595 |
* the desired token if no line separators are present. |
|
1596 |
* |
|
1597 |
* @param pattern the pattern to scan for |
|
1598 |
* @return the text that matched the specified pattern |
|
1599 |
* @throws IllegalStateException if this scanner is closed |
|
1600 |
*/ |
|
1601 |
public String findInLine(Pattern pattern) { |
|
1602 |
ensureOpen(); |
|
1603 |
if (pattern == null) |
|
1604 |
throw new NullPointerException(); |
|
1605 |
clearCaches(); |
|
32650 | 1606 |
modCount++; |
2 | 1607 |
// Expand buffer to include the next newline or end of input |
1608 |
int endPosition = 0; |
|
1609 |
saveState(); |
|
1610 |
while (true) { |
|
32650 | 1611 |
if (findPatternInBuffer(separatorPattern(), 0)) { |
2 | 1612 |
endPosition = matcher.start(); |
1613 |
break; // up to next newline |
|
1614 |
} |
|
1615 |
if (needInput) { |
|
1616 |
readInput(); |
|
1617 |
} else { |
|
1618 |
endPosition = buf.limit(); |
|
1619 |
break; // up to end of input |
|
1620 |
} |
|
1621 |
} |
|
1622 |
revertState(); |
|
1623 |
int horizonForLine = endPosition - position; |
|
1624 |
// If there is nothing between the current pos and the next |
|
1625 |
// newline simply return null, invoking findWithinHorizon |
|
1626 |
// with "horizon=0" will scan beyond the line bound. |
|
1627 |
if (horizonForLine == 0) |
|
1628 |
return null; |
|
1629 |
// Search for the pattern |
|
1630 |
return findWithinHorizon(pattern, horizonForLine); |
|
1631 |
} |
|
1632 |
||
1633 |
/** |
|
1634 |
* Attempts to find the next occurrence of a pattern constructed from the |
|
1635 |
* specified string, ignoring delimiters. |
|
1636 |
* |
|
1637 |
* <p>An invocation of this method of the form |
|
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diff
changeset
|
1638 |
* {@code findWithinHorizon(pattern)} behaves in exactly the same way as |
2 | 1639 |
* the invocation |
32650 | 1640 |
* {@code findWithinHorizon(Pattern.compile(pattern), horizon)}. |
2 | 1641 |
* |
1642 |
* @param pattern a string specifying the pattern to search for |
|
19074
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bpb
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18156
diff
changeset
|
1643 |
* @param horizon the search horizon |
2 | 1644 |
* @return the text that matched the specified pattern |
1645 |
* @throws IllegalStateException if this scanner is closed |
|
1646 |
* @throws IllegalArgumentException if horizon is negative |
|
1647 |
*/ |
|
1648 |
public String findWithinHorizon(String pattern, int horizon) { |
|
1649 |
return findWithinHorizon(patternCache.forName(pattern), horizon); |
|
1650 |
} |
|
1651 |
||
1652 |
/** |
|
1653 |
* Attempts to find the next occurrence of the specified pattern. |
|
1654 |
* |
|
1655 |
* <p>This method searches through the input up to the specified |
|
1656 |
* search horizon, ignoring delimiters. If the pattern is found the |
|
1657 |
* scanner advances past the input that matched and returns the string |
|
1658 |
* that matched the pattern. If no such pattern is detected then the |
|
1659 |
* null is returned and the scanner's position remains unchanged. This |
|
1660 |
* method may block waiting for input that matches the pattern. |
|
1661 |
* |
|
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avstepan
parents:
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diff
changeset
|
1662 |
* <p>A scanner will never search more than {@code horizon} code |
2 | 1663 |
* points beyond its current position. Note that a match may be clipped |
1664 |
* by the horizon; that is, an arbitrary match result may have been |
|
1665 |
* different if the horizon had been larger. The scanner treats the |
|
1666 |
* horizon as a transparent, non-anchoring bound (see {@link |
|
1667 |
* Matcher#useTransparentBounds} and {@link Matcher#useAnchoringBounds}). |
|
1668 |
* |
|
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parents:
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diff
changeset
|
1669 |
* <p>If horizon is {@code 0}, then the horizon is ignored and |
2 | 1670 |
* this method continues to search through the input looking for the |
1671 |
* specified pattern without bound. In this case it may buffer all of |
|
1672 |
* the input searching for the pattern. |
|
1673 |
* |
|
1674 |
* <p>If horizon is negative, then an IllegalArgumentException is |
|
1675 |
* thrown. |
|
1676 |
* |
|
1677 |
* @param pattern the pattern to scan for |
|
19074
84a8d23e8f32
8020539: Clean up doclint problems in java.util package, part 2
bpb
parents:
18156
diff
changeset
|
1678 |
* @param horizon the search horizon |
2 | 1679 |
* @return the text that matched the specified pattern |
1680 |
* @throws IllegalStateException if this scanner is closed |
|
1681 |
* @throws IllegalArgumentException if horizon is negative |
|
1682 |
*/ |
|
1683 |
public String findWithinHorizon(Pattern pattern, int horizon) { |
|
1684 |
ensureOpen(); |
|
1685 |
if (pattern == null) |
|
1686 |
throw new NullPointerException(); |
|
1687 |
if (horizon < 0) |
|
1688 |
throw new IllegalArgumentException("horizon < 0"); |
|
1689 |
clearCaches(); |
|
32650 | 1690 |
modCount++; |
2 | 1691 |
|
1692 |
// Search for the pattern |
|
1693 |
while (true) { |
|
32650 | 1694 |
if (findPatternInBuffer(pattern, horizon)) { |
2 | 1695 |
matchValid = true; |
32650 | 1696 |
return matcher.group(); |
2 | 1697 |
} |
1698 |
if (needInput) |
|
1699 |
readInput(); |
|
1700 |
else |
|
1701 |
break; // up to end of input |
|
1702 |
} |
|
1703 |
return null; |
|
1704 |
} |
|
1705 |
||
1706 |
/** |
|
1707 |
* Skips input that matches the specified pattern, ignoring delimiters. |
|
1708 |
* This method will skip input if an anchored match of the specified |
|
1709 |
* pattern succeeds. |
|
1710 |
* |
|
1711 |
* <p>If a match to the specified pattern is not found at the |
|
1712 |
* current position, then no input is skipped and a |
|
32108
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8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
1713 |
* {@code NoSuchElementException} is thrown. |
2 | 1714 |
* |
1715 |
* <p>Since this method seeks to match the specified pattern starting at |
|
1716 |
* the scanner's current position, patterns that can match a lot of |
|
1717 |
* input (".*", for example) may cause the scanner to buffer a large |
|
1718 |
* amount of input. |
|
1719 |
* |
|
1720 |
* <p>Note that it is possible to skip something without risking a |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
1721 |
* {@code NoSuchElementException} by using a pattern that can |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
1722 |
* match nothing, e.g., {@code sc.skip("[ \t]*")}. |
2 | 1723 |
* |
1724 |
* @param pattern a string specifying the pattern to skip over |
|
1725 |
* @return this scanner |
|
1726 |
* @throws NoSuchElementException if the specified pattern is not found |
|
1727 |
* @throws IllegalStateException if this scanner is closed |
|
1728 |
*/ |
|
1729 |
public Scanner skip(Pattern pattern) { |
|
1730 |
ensureOpen(); |
|
1731 |
if (pattern == null) |
|
1732 |
throw new NullPointerException(); |
|
1733 |
clearCaches(); |
|
32650 | 1734 |
modCount++; |
2 | 1735 |
|
1736 |
// Search for the pattern |
|
1737 |
while (true) { |
|
32650 | 1738 |
if (matchPatternInBuffer(pattern)) { |
2 | 1739 |
matchValid = true; |
1740 |
position = matcher.end(); |
|
1741 |
return this; |
|
1742 |
} |
|
1743 |
if (needInput) |
|
1744 |
readInput(); |
|
1745 |
else |
|
1746 |
throw new NoSuchElementException(); |
|
1747 |
} |
|
1748 |
} |
|
1749 |
||
1750 |
/** |
|
1751 |
* Skips input that matches a pattern constructed from the specified |
|
1752 |
* string. |
|
1753 |
* |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
1754 |
* <p> An invocation of this method of the form {@code skip(pattern)} |
2 | 1755 |
* behaves in exactly the same way as the invocation |
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
1756 |
* {@code skip(Pattern.compile(pattern))}. |
2 | 1757 |
* |
1758 |
* @param pattern a string specifying the pattern to skip over |
|
1759 |
* @return this scanner |
|
1760 |
* @throws IllegalStateException if this scanner is closed |
|
1761 |
*/ |
|
1762 |
public Scanner skip(String pattern) { |
|
1763 |
return skip(patternCache.forName(pattern)); |
|
1764 |
} |
|
1765 |
||
1766 |
// Convenience methods for scanning primitives |
|
1767 |
||
1768 |
/** |
|
1769 |
* Returns true if the next token in this scanner's input can be |
|
1770 |
* interpreted as a boolean value using a case insensitive pattern |
|
1771 |
* created from the string "true|false". The scanner does not |
|
1772 |
* advance past the input that matched. |
|
1773 |
* |
|
1774 |
* @return true if and only if this scanner's next token is a valid |
|
1775 |
* boolean value |
|
1776 |
* @throws IllegalStateException if this scanner is closed |
|
1777 |
*/ |
|
1778 |
public boolean hasNextBoolean() { |
|
1779 |
return hasNext(boolPattern()); |
|
1780 |
} |
|
1781 |
||
1782 |
/** |
|
1783 |
* Scans the next token of the input into a boolean value and returns |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
1784 |
* that value. This method will throw {@code InputMismatchException} |
2 | 1785 |
* if the next token cannot be translated into a valid boolean value. |
1786 |
* If the match is successful, the scanner advances past the input that |
|
1787 |
* matched. |
|
1788 |
* |
|
1789 |
* @return the boolean scanned from the input |
|
1790 |
* @throws InputMismatchException if the next token is not a valid boolean |
|
1791 |
* @throws NoSuchElementException if input is exhausted |
|
1792 |
* @throws IllegalStateException if this scanner is closed |
|
1793 |
*/ |
|
1794 |
public boolean nextBoolean() { |
|
1795 |
clearCaches(); |
|
1796 |
return Boolean.parseBoolean(next(boolPattern())); |
|
1797 |
} |
|
1798 |
||
1799 |
/** |
|
1800 |
* Returns true if the next token in this scanner's input can be |
|
1801 |
* interpreted as a byte value in the default radix using the |
|
1802 |
* {@link #nextByte} method. The scanner does not advance past any input. |
|
1803 |
* |
|
1804 |
* @return true if and only if this scanner's next token is a valid |
|
1805 |
* byte value |
|
1806 |
* @throws IllegalStateException if this scanner is closed |
|
1807 |
*/ |
|
1808 |
public boolean hasNextByte() { |
|
1809 |
return hasNextByte(defaultRadix); |
|
1810 |
} |
|
1811 |
||
1812 |
/** |
|
1813 |
* Returns true if the next token in this scanner's input can be |
|
1814 |
* interpreted as a byte value in the specified radix using the |
|
1815 |
* {@link #nextByte} method. The scanner does not advance past any input. |
|
1816 |
* |
|
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
1817 |
* <p>If the radix is less than {@link Character#MIN_RADIX Character.MIN_RADIX} |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
1818 |
* or greater than {@link Character#MAX_RADIX Character.MAX_RADIX}, then an |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
1819 |
* {@code IllegalArgumentException} is thrown. |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
1820 |
* |
2 | 1821 |
* @param radix the radix used to interpret the token as a byte value |
1822 |
* @return true if and only if this scanner's next token is a valid |
|
1823 |
* byte value |
|
1824 |
* @throws IllegalStateException if this scanner is closed |
|
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
1825 |
* @throws IllegalArgumentException if the radix is out of range |
2 | 1826 |
*/ |
1827 |
public boolean hasNextByte(int radix) { |
|
1828 |
setRadix(radix); |
|
1829 |
boolean result = hasNext(integerPattern()); |
|
1830 |
if (result) { // Cache it |
|
1831 |
try { |
|
1832 |
String s = (matcher.group(SIMPLE_GROUP_INDEX) == null) ? |
|
1833 |
processIntegerToken(hasNextResult) : |
|
1834 |
hasNextResult; |
|
1835 |
typeCache = Byte.parseByte(s, radix); |
|
1836 |
} catch (NumberFormatException nfe) { |
|
1837 |
result = false; |
|
1838 |
} |
|
1839 |
} |
|
1840 |
return result; |
|
1841 |
} |
|
1842 |
||
1843 |
/** |
|
32108
aa5490a167ee
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changeset
|
1844 |
* Scans the next token of the input as a {@code byte}. |
2 | 1845 |
* |
1846 |
* <p> An invocation of this method of the form |
|
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changeset
|
1847 |
* {@code nextByte()} behaves in exactly the same way as the |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
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changeset
|
1848 |
* invocation {@code nextByte(radix)}, where {@code radix} |
2 | 1849 |
* is the default radix of this scanner. |
1850 |
* |
|
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changeset
|
1851 |
* @return the {@code byte} scanned from the input |
2 | 1852 |
* @throws InputMismatchException |
1853 |
* if the next token does not match the <i>Integer</i> |
|
1854 |
* regular expression, or is out of range |
|
1855 |
* @throws NoSuchElementException if input is exhausted |
|
1856 |
* @throws IllegalStateException if this scanner is closed |
|
1857 |
*/ |
|
1858 |
public byte nextByte() { |
|
1859 |
return nextByte(defaultRadix); |
|
1860 |
} |
|
1861 |
||
1862 |
/** |
|
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changeset
|
1863 |
* Scans the next token of the input as a {@code byte}. |
aa5490a167ee
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changeset
|
1864 |
* This method will throw {@code InputMismatchException} |
2 | 1865 |
* if the next token cannot be translated into a valid byte value as |
1866 |
* described below. If the translation is successful, the scanner advances |
|
1867 |
* past the input that matched. |
|
1868 |
* |
|
1869 |
* <p> If the next token matches the <a |
|
1870 |
* href="#Integer-regex"><i>Integer</i></a> regular expression defined |
|
32108
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changeset
|
1871 |
* above then the token is converted into a {@code byte} value as if by |
2 | 1872 |
* removing all locale specific prefixes, group separators, and locale |
1873 |
* specific suffixes, then mapping non-ASCII digits into ASCII |
|
1874 |
* digits via {@link Character#digit Character.digit}, prepending a |
|
1875 |
* negative sign (-) if the locale specific negative prefixes and suffixes |
|
1876 |
* were present, and passing the resulting string to |
|
1877 |
* {@link Byte#parseByte(String, int) Byte.parseByte} with the |
|
1878 |
* specified radix. |
|
1879 |
* |
|
41824
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changeset
|
1880 |
* <p>If the radix is less than {@link Character#MIN_RADIX Character.MIN_RADIX} |
ebb396875090
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changeset
|
1881 |
* or greater than {@link Character#MAX_RADIX Character.MAX_RADIX}, then an |
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changeset
|
1882 |
* {@code IllegalArgumentException} is thrown. |
ebb396875090
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changeset
|
1883 |
* |
2 | 1884 |
* @param radix the radix used to interpret the token as a byte value |
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changeset
|
1885 |
* @return the {@code byte} scanned from the input |
2 | 1886 |
* @throws InputMismatchException |
1887 |
* if the next token does not match the <i>Integer</i> |
|
1888 |
* regular expression, or is out of range |
|
1889 |
* @throws NoSuchElementException if input is exhausted |
|
1890 |
* @throws IllegalStateException if this scanner is closed |
|
41824
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changeset
|
1891 |
* @throws IllegalArgumentException if the radix is out of range |
2 | 1892 |
*/ |
1893 |
public byte nextByte(int radix) { |
|
1894 |
// Check cached result |
|
1895 |
if ((typeCache != null) && (typeCache instanceof Byte) |
|
1896 |
&& this.radix == radix) { |
|
1897 |
byte val = ((Byte)typeCache).byteValue(); |
|
1898 |
useTypeCache(); |
|
1899 |
return val; |
|
1900 |
} |
|
1901 |
setRadix(radix); |
|
1902 |
clearCaches(); |
|
1903 |
// Search for next byte |
|
1904 |
try { |
|
1905 |
String s = next(integerPattern()); |
|
1906 |
if (matcher.group(SIMPLE_GROUP_INDEX) == null) |
|
1907 |
s = processIntegerToken(s); |
|
1908 |
return Byte.parseByte(s, radix); |
|
1909 |
} catch (NumberFormatException nfe) { |
|
1910 |
position = matcher.start(); // don't skip bad token |
|
1911 |
throw new InputMismatchException(nfe.getMessage()); |
|
1912 |
} |
|
1913 |
} |
|
1914 |
||
1915 |
/** |
|
1916 |
* Returns true if the next token in this scanner's input can be |
|
1917 |
* interpreted as a short value in the default radix using the |
|
1918 |
* {@link #nextShort} method. The scanner does not advance past any input. |
|
1919 |
* |
|
1920 |
* @return true if and only if this scanner's next token is a valid |
|
1921 |
* short value in the default radix |
|
1922 |
* @throws IllegalStateException if this scanner is closed |
|
1923 |
*/ |
|
1924 |
public boolean hasNextShort() { |
|
1925 |
return hasNextShort(defaultRadix); |
|
1926 |
} |
|
1927 |
||
1928 |
/** |
|
1929 |
* Returns true if the next token in this scanner's input can be |
|
1930 |
* interpreted as a short value in the specified radix using the |
|
1931 |
* {@link #nextShort} method. The scanner does not advance past any input. |
|
1932 |
* |
|
41824
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|
1933 |
* <p>If the radix is less than {@link Character#MIN_RADIX Character.MIN_RADIX} |
ebb396875090
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|
1934 |
* or greater than {@link Character#MAX_RADIX Character.MAX_RADIX}, then an |
ebb396875090
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|
1935 |
* {@code IllegalArgumentException} is thrown. |
ebb396875090
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changeset
|
1936 |
* |
2 | 1937 |
* @param radix the radix used to interpret the token as a short value |
1938 |
* @return true if and only if this scanner's next token is a valid |
|
1939 |
* short value in the specified radix |
|
1940 |
* @throws IllegalStateException if this scanner is closed |
|
41824
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changeset
|
1941 |
* @throws IllegalArgumentException if the radix is out of range |
2 | 1942 |
*/ |
1943 |
public boolean hasNextShort(int radix) { |
|
1944 |
setRadix(radix); |
|
1945 |
boolean result = hasNext(integerPattern()); |
|
1946 |
if (result) { // Cache it |
|
1947 |
try { |
|
1948 |
String s = (matcher.group(SIMPLE_GROUP_INDEX) == null) ? |
|
1949 |
processIntegerToken(hasNextResult) : |
|
1950 |
hasNextResult; |
|
1951 |
typeCache = Short.parseShort(s, radix); |
|
1952 |
} catch (NumberFormatException nfe) { |
|
1953 |
result = false; |
|
1954 |
} |
|
1955 |
} |
|
1956 |
return result; |
|
1957 |
} |
|
1958 |
||
1959 |
/** |
|
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changeset
|
1960 |
* Scans the next token of the input as a {@code short}. |
2 | 1961 |
* |
1962 |
* <p> An invocation of this method of the form |
|
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changeset
|
1963 |
* {@code nextShort()} behaves in exactly the same way as the |
32650 | 1964 |
* invocation {@link #nextShort(int) nextShort(radix)}, where {@code radix} |
2 | 1965 |
* is the default radix of this scanner. |
1966 |
* |
|
32108
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avstepan
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changeset
|
1967 |
* @return the {@code short} scanned from the input |
2 | 1968 |
* @throws InputMismatchException |
1969 |
* if the next token does not match the <i>Integer</i> |
|
1970 |
* regular expression, or is out of range |
|
1971 |
* @throws NoSuchElementException if input is exhausted |
|
1972 |
* @throws IllegalStateException if this scanner is closed |
|
1973 |
*/ |
|
1974 |
public short nextShort() { |
|
1975 |
return nextShort(defaultRadix); |
|
1976 |
} |
|
1977 |
||
1978 |
/** |
|
32108
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avstepan
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changeset
|
1979 |
* Scans the next token of the input as a {@code short}. |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
1980 |
* This method will throw {@code InputMismatchException} |
2 | 1981 |
* if the next token cannot be translated into a valid short value as |
1982 |
* described below. If the translation is successful, the scanner advances |
|
1983 |
* past the input that matched. |
|
1984 |
* |
|
1985 |
* <p> If the next token matches the <a |
|
1986 |
* href="#Integer-regex"><i>Integer</i></a> regular expression defined |
|
32108
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8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
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diff
changeset
|
1987 |
* above then the token is converted into a {@code short} value as if by |
2 | 1988 |
* removing all locale specific prefixes, group separators, and locale |
1989 |
* specific suffixes, then mapping non-ASCII digits into ASCII |
|
1990 |
* digits via {@link Character#digit Character.digit}, prepending a |
|
1991 |
* negative sign (-) if the locale specific negative prefixes and suffixes |
|
1992 |
* were present, and passing the resulting string to |
|
1993 |
* {@link Short#parseShort(String, int) Short.parseShort} with the |
|
1994 |
* specified radix. |
|
1995 |
* |
|
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
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diff
changeset
|
1996 |
* <p>If the radix is less than {@link Character#MIN_RADIX Character.MIN_RADIX} |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
1997 |
* or greater than {@link Character#MAX_RADIX Character.MAX_RADIX}, then an |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
1998 |
* {@code IllegalArgumentException} is thrown. |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
1999 |
* |
2 | 2000 |
* @param radix the radix used to interpret the token as a short value |
32108
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8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
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diff
changeset
|
2001 |
* @return the {@code short} scanned from the input |
2 | 2002 |
* @throws InputMismatchException |
2003 |
* if the next token does not match the <i>Integer</i> |
|
2004 |
* regular expression, or is out of range |
|
2005 |
* @throws NoSuchElementException if input is exhausted |
|
2006 |
* @throws IllegalStateException if this scanner is closed |
|
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2007 |
* @throws IllegalArgumentException if the radix is out of range |
2 | 2008 |
*/ |
2009 |
public short nextShort(int radix) { |
|
2010 |
// Check cached result |
|
2011 |
if ((typeCache != null) && (typeCache instanceof Short) |
|
2012 |
&& this.radix == radix) { |
|
2013 |
short val = ((Short)typeCache).shortValue(); |
|
2014 |
useTypeCache(); |
|
2015 |
return val; |
|
2016 |
} |
|
2017 |
setRadix(radix); |
|
2018 |
clearCaches(); |
|
2019 |
// Search for next short |
|
2020 |
try { |
|
2021 |
String s = next(integerPattern()); |
|
2022 |
if (matcher.group(SIMPLE_GROUP_INDEX) == null) |
|
2023 |
s = processIntegerToken(s); |
|
2024 |
return Short.parseShort(s, radix); |
|
2025 |
} catch (NumberFormatException nfe) { |
|
2026 |
position = matcher.start(); // don't skip bad token |
|
2027 |
throw new InputMismatchException(nfe.getMessage()); |
|
2028 |
} |
|
2029 |
} |
|
2030 |
||
2031 |
/** |
|
2032 |
* Returns true if the next token in this scanner's input can be |
|
2033 |
* interpreted as an int value in the default radix using the |
|
2034 |
* {@link #nextInt} method. The scanner does not advance past any input. |
|
2035 |
* |
|
2036 |
* @return true if and only if this scanner's next token is a valid |
|
2037 |
* int value |
|
2038 |
* @throws IllegalStateException if this scanner is closed |
|
2039 |
*/ |
|
2040 |
public boolean hasNextInt() { |
|
2041 |
return hasNextInt(defaultRadix); |
|
2042 |
} |
|
2043 |
||
2044 |
/** |
|
2045 |
* Returns true if the next token in this scanner's input can be |
|
2046 |
* interpreted as an int value in the specified radix using the |
|
2047 |
* {@link #nextInt} method. The scanner does not advance past any input. |
|
2048 |
* |
|
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2049 |
* <p>If the radix is less than {@link Character#MIN_RADIX Character.MIN_RADIX} |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2050 |
* or greater than {@link Character#MAX_RADIX Character.MAX_RADIX}, then an |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2051 |
* {@code IllegalArgumentException} is thrown. |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2052 |
* |
2 | 2053 |
* @param radix the radix used to interpret the token as an int value |
2054 |
* @return true if and only if this scanner's next token is a valid |
|
2055 |
* int value |
|
2056 |
* @throws IllegalStateException if this scanner is closed |
|
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2057 |
* @throws IllegalArgumentException if the radix is out of range |
2 | 2058 |
*/ |
2059 |
public boolean hasNextInt(int radix) { |
|
2060 |
setRadix(radix); |
|
2061 |
boolean result = hasNext(integerPattern()); |
|
2062 |
if (result) { // Cache it |
|
2063 |
try { |
|
2064 |
String s = (matcher.group(SIMPLE_GROUP_INDEX) == null) ? |
|
2065 |
processIntegerToken(hasNextResult) : |
|
2066 |
hasNextResult; |
|
2067 |
typeCache = Integer.parseInt(s, radix); |
|
2068 |
} catch (NumberFormatException nfe) { |
|
2069 |
result = false; |
|
2070 |
} |
|
2071 |
} |
|
2072 |
return result; |
|
2073 |
} |
|
2074 |
||
2075 |
/** |
|
2076 |
* The integer token must be stripped of prefixes, group separators, |
|
2077 |
* and suffixes, non ascii digits must be converted into ascii digits |
|
2078 |
* before parse will accept it. |
|
2079 |
*/ |
|
2080 |
private String processIntegerToken(String token) { |
|
2081 |
String result = token.replaceAll(""+groupSeparator, ""); |
|
2082 |
boolean isNegative = false; |
|
2083 |
int preLen = negativePrefix.length(); |
|
2084 |
if ((preLen > 0) && result.startsWith(negativePrefix)) { |
|
2085 |
isNegative = true; |
|
2086 |
result = result.substring(preLen); |
|
2087 |
} |
|
2088 |
int sufLen = negativeSuffix.length(); |
|
2089 |
if ((sufLen > 0) && result.endsWith(negativeSuffix)) { |
|
2090 |
isNegative = true; |
|
2091 |
result = result.substring(result.length() - sufLen, |
|
2092 |
result.length()); |
|
2093 |
} |
|
2094 |
if (isNegative) |
|
2095 |
result = "-" + result; |
|
2096 |
return result; |
|
2097 |
} |
|
2098 |
||
2099 |
/** |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2100 |
* Scans the next token of the input as an {@code int}. |
2 | 2101 |
* |
2102 |
* <p> An invocation of this method of the form |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2103 |
* {@code nextInt()} behaves in exactly the same way as the |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2104 |
* invocation {@code nextInt(radix)}, where {@code radix} |
2 | 2105 |
* is the default radix of this scanner. |
2106 |
* |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2107 |
* @return the {@code int} scanned from the input |
2 | 2108 |
* @throws InputMismatchException |
2109 |
* if the next token does not match the <i>Integer</i> |
|
2110 |
* regular expression, or is out of range |
|
2111 |
* @throws NoSuchElementException if input is exhausted |
|
2112 |
* @throws IllegalStateException if this scanner is closed |
|
2113 |
*/ |
|
2114 |
public int nextInt() { |
|
2115 |
return nextInt(defaultRadix); |
|
2116 |
} |
|
2117 |
||
2118 |
/** |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2119 |
* Scans the next token of the input as an {@code int}. |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2120 |
* This method will throw {@code InputMismatchException} |
2 | 2121 |
* if the next token cannot be translated into a valid int value as |
2122 |
* described below. If the translation is successful, the scanner advances |
|
2123 |
* past the input that matched. |
|
2124 |
* |
|
2125 |
* <p> If the next token matches the <a |
|
2126 |
* href="#Integer-regex"><i>Integer</i></a> regular expression defined |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2127 |
* above then the token is converted into an {@code int} value as if by |
2 | 2128 |
* removing all locale specific prefixes, group separators, and locale |
2129 |
* specific suffixes, then mapping non-ASCII digits into ASCII |
|
2130 |
* digits via {@link Character#digit Character.digit}, prepending a |
|
2131 |
* negative sign (-) if the locale specific negative prefixes and suffixes |
|
2132 |
* were present, and passing the resulting string to |
|
2133 |
* {@link Integer#parseInt(String, int) Integer.parseInt} with the |
|
2134 |
* specified radix. |
|
2135 |
* |
|
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2136 |
* <p>If the radix is less than {@link Character#MIN_RADIX Character.MIN_RADIX} |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2137 |
* or greater than {@link Character#MAX_RADIX Character.MAX_RADIX}, then an |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2138 |
* {@code IllegalArgumentException} is thrown. |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2139 |
* |
2 | 2140 |
* @param radix the radix used to interpret the token as an int value |
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2141 |
* @return the {@code int} scanned from the input |
2 | 2142 |
* @throws InputMismatchException |
2143 |
* if the next token does not match the <i>Integer</i> |
|
2144 |
* regular expression, or is out of range |
|
2145 |
* @throws NoSuchElementException if input is exhausted |
|
2146 |
* @throws IllegalStateException if this scanner is closed |
|
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2147 |
* @throws IllegalArgumentException if the radix is out of range |
2 | 2148 |
*/ |
2149 |
public int nextInt(int radix) { |
|
2150 |
// Check cached result |
|
2151 |
if ((typeCache != null) && (typeCache instanceof Integer) |
|
2152 |
&& this.radix == radix) { |
|
2153 |
int val = ((Integer)typeCache).intValue(); |
|
2154 |
useTypeCache(); |
|
2155 |
return val; |
|
2156 |
} |
|
2157 |
setRadix(radix); |
|
2158 |
clearCaches(); |
|
2159 |
// Search for next int |
|
2160 |
try { |
|
2161 |
String s = next(integerPattern()); |
|
2162 |
if (matcher.group(SIMPLE_GROUP_INDEX) == null) |
|
2163 |
s = processIntegerToken(s); |
|
2164 |
return Integer.parseInt(s, radix); |
|
2165 |
} catch (NumberFormatException nfe) { |
|
2166 |
position = matcher.start(); // don't skip bad token |
|
2167 |
throw new InputMismatchException(nfe.getMessage()); |
|
2168 |
} |
|
2169 |
} |
|
2170 |
||
2171 |
/** |
|
2172 |
* Returns true if the next token in this scanner's input can be |
|
2173 |
* interpreted as a long value in the default radix using the |
|
2174 |
* {@link #nextLong} method. The scanner does not advance past any input. |
|
2175 |
* |
|
2176 |
* @return true if and only if this scanner's next token is a valid |
|
2177 |
* long value |
|
2178 |
* @throws IllegalStateException if this scanner is closed |
|
2179 |
*/ |
|
2180 |
public boolean hasNextLong() { |
|
2181 |
return hasNextLong(defaultRadix); |
|
2182 |
} |
|
2183 |
||
2184 |
/** |
|
2185 |
* Returns true if the next token in this scanner's input can be |
|
2186 |
* interpreted as a long value in the specified radix using the |
|
2187 |
* {@link #nextLong} method. The scanner does not advance past any input. |
|
2188 |
* |
|
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2189 |
* <p>If the radix is less than {@link Character#MIN_RADIX Character.MIN_RADIX} |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2190 |
* or greater than {@link Character#MAX_RADIX Character.MAX_RADIX}, then an |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2191 |
* {@code IllegalArgumentException} is thrown. |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2192 |
* |
2 | 2193 |
* @param radix the radix used to interpret the token as a long value |
2194 |
* @return true if and only if this scanner's next token is a valid |
|
2195 |
* long value |
|
2196 |
* @throws IllegalStateException if this scanner is closed |
|
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2197 |
* @throws IllegalArgumentException if the radix is out of range |
2 | 2198 |
*/ |
2199 |
public boolean hasNextLong(int radix) { |
|
2200 |
setRadix(radix); |
|
2201 |
boolean result = hasNext(integerPattern()); |
|
2202 |
if (result) { // Cache it |
|
2203 |
try { |
|
2204 |
String s = (matcher.group(SIMPLE_GROUP_INDEX) == null) ? |
|
2205 |
processIntegerToken(hasNextResult) : |
|
2206 |
hasNextResult; |
|
2207 |
typeCache = Long.parseLong(s, radix); |
|
2208 |
} catch (NumberFormatException nfe) { |
|
2209 |
result = false; |
|
2210 |
} |
|
2211 |
} |
|
2212 |
return result; |
|
2213 |
} |
|
2214 |
||
2215 |
/** |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2216 |
* Scans the next token of the input as a {@code long}. |
2 | 2217 |
* |
2218 |
* <p> An invocation of this method of the form |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2219 |
* {@code nextLong()} behaves in exactly the same way as the |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2220 |
* invocation {@code nextLong(radix)}, where {@code radix} |
2 | 2221 |
* is the default radix of this scanner. |
2222 |
* |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2223 |
* @return the {@code long} scanned from the input |
2 | 2224 |
* @throws InputMismatchException |
2225 |
* if the next token does not match the <i>Integer</i> |
|
2226 |
* regular expression, or is out of range |
|
2227 |
* @throws NoSuchElementException if input is exhausted |
|
2228 |
* @throws IllegalStateException if this scanner is closed |
|
2229 |
*/ |
|
2230 |
public long nextLong() { |
|
2231 |
return nextLong(defaultRadix); |
|
2232 |
} |
|
2233 |
||
2234 |
/** |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2235 |
* Scans the next token of the input as a {@code long}. |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2236 |
* This method will throw {@code InputMismatchException} |
2 | 2237 |
* if the next token cannot be translated into a valid long value as |
2238 |
* described below. If the translation is successful, the scanner advances |
|
2239 |
* past the input that matched. |
|
2240 |
* |
|
2241 |
* <p> If the next token matches the <a |
|
2242 |
* href="#Integer-regex"><i>Integer</i></a> regular expression defined |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2243 |
* above then the token is converted into a {@code long} value as if by |
2 | 2244 |
* removing all locale specific prefixes, group separators, and locale |
2245 |
* specific suffixes, then mapping non-ASCII digits into ASCII |
|
2246 |
* digits via {@link Character#digit Character.digit}, prepending a |
|
2247 |
* negative sign (-) if the locale specific negative prefixes and suffixes |
|
2248 |
* were present, and passing the resulting string to |
|
2249 |
* {@link Long#parseLong(String, int) Long.parseLong} with the |
|
2250 |
* specified radix. |
|
2251 |
* |
|
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2252 |
* <p>If the radix is less than {@link Character#MIN_RADIX Character.MIN_RADIX} |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2253 |
* or greater than {@link Character#MAX_RADIX Character.MAX_RADIX}, then an |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2254 |
* {@code IllegalArgumentException} is thrown. |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2255 |
* |
2 | 2256 |
* @param radix the radix used to interpret the token as an int value |
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2257 |
* @return the {@code long} scanned from the input |
2 | 2258 |
* @throws InputMismatchException |
2259 |
* if the next token does not match the <i>Integer</i> |
|
2260 |
* regular expression, or is out of range |
|
2261 |
* @throws NoSuchElementException if input is exhausted |
|
2262 |
* @throws IllegalStateException if this scanner is closed |
|
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2263 |
* @throws IllegalArgumentException if the radix is out of range |
2 | 2264 |
*/ |
2265 |
public long nextLong(int radix) { |
|
2266 |
// Check cached result |
|
2267 |
if ((typeCache != null) && (typeCache instanceof Long) |
|
2268 |
&& this.radix == radix) { |
|
2269 |
long val = ((Long)typeCache).longValue(); |
|
2270 |
useTypeCache(); |
|
2271 |
return val; |
|
2272 |
} |
|
2273 |
setRadix(radix); |
|
2274 |
clearCaches(); |
|
2275 |
try { |
|
2276 |
String s = next(integerPattern()); |
|
2277 |
if (matcher.group(SIMPLE_GROUP_INDEX) == null) |
|
2278 |
s = processIntegerToken(s); |
|
2279 |
return Long.parseLong(s, radix); |
|
2280 |
} catch (NumberFormatException nfe) { |
|
2281 |
position = matcher.start(); // don't skip bad token |
|
2282 |
throw new InputMismatchException(nfe.getMessage()); |
|
2283 |
} |
|
2284 |
} |
|
2285 |
||
2286 |
/** |
|
2287 |
* The float token must be stripped of prefixes, group separators, |
|
2288 |
* and suffixes, non ascii digits must be converted into ascii digits |
|
2289 |
* before parseFloat will accept it. |
|
2290 |
* |
|
2291 |
* If there are non-ascii digits in the token these digits must |
|
2292 |
* be processed before the token is passed to parseFloat. |
|
2293 |
*/ |
|
2294 |
private String processFloatToken(String token) { |
|
2295 |
String result = token.replaceAll(groupSeparator, ""); |
|
2296 |
if (!decimalSeparator.equals("\\.")) |
|
2297 |
result = result.replaceAll(decimalSeparator, "."); |
|
2298 |
boolean isNegative = false; |
|
2299 |
int preLen = negativePrefix.length(); |
|
2300 |
if ((preLen > 0) && result.startsWith(negativePrefix)) { |
|
2301 |
isNegative = true; |
|
2302 |
result = result.substring(preLen); |
|
2303 |
} |
|
2304 |
int sufLen = negativeSuffix.length(); |
|
2305 |
if ((sufLen > 0) && result.endsWith(negativeSuffix)) { |
|
2306 |
isNegative = true; |
|
2307 |
result = result.substring(result.length() - sufLen, |
|
2308 |
result.length()); |
|
2309 |
} |
|
2310 |
if (result.equals(nanString)) |
|
2311 |
result = "NaN"; |
|
2312 |
if (result.equals(infinityString)) |
|
2313 |
result = "Infinity"; |
|
2314 |
if (isNegative) |
|
2315 |
result = "-" + result; |
|
2316 |
||
2317 |
// Translate non-ASCII digits |
|
2318 |
Matcher m = NON_ASCII_DIGIT.matcher(result); |
|
2319 |
if (m.find()) { |
|
2320 |
StringBuilder inASCII = new StringBuilder(); |
|
2321 |
for (int i=0; i<result.length(); i++) { |
|
2322 |
char nextChar = result.charAt(i); |
|
2323 |
if (Character.isDigit(nextChar)) { |
|
2324 |
int d = Character.digit(nextChar, 10); |
|
2325 |
if (d != -1) |
|
2326 |
inASCII.append(d); |
|
2327 |
else |
|
2328 |
inASCII.append(nextChar); |
|
2329 |
} else { |
|
2330 |
inASCII.append(nextChar); |
|
2331 |
} |
|
2332 |
} |
|
2333 |
result = inASCII.toString(); |
|
2334 |
} |
|
2335 |
||
2336 |
return result; |
|
2337 |
} |
|
2338 |
||
2339 |
/** |
|
2340 |
* Returns true if the next token in this scanner's input can be |
|
2341 |
* interpreted as a float value using the {@link #nextFloat} |
|
2342 |
* method. The scanner does not advance past any input. |
|
2343 |
* |
|
2344 |
* @return true if and only if this scanner's next token is a valid |
|
2345 |
* float value |
|
2346 |
* @throws IllegalStateException if this scanner is closed |
|
2347 |
*/ |
|
2348 |
public boolean hasNextFloat() { |
|
2349 |
setRadix(10); |
|
2350 |
boolean result = hasNext(floatPattern()); |
|
2351 |
if (result) { // Cache it |
|
2352 |
try { |
|
2353 |
String s = processFloatToken(hasNextResult); |
|
2354 |
typeCache = Float.valueOf(Float.parseFloat(s)); |
|
2355 |
} catch (NumberFormatException nfe) { |
|
2356 |
result = false; |
|
2357 |
} |
|
2358 |
} |
|
2359 |
return result; |
|
2360 |
} |
|
2361 |
||
2362 |
/** |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2363 |
* Scans the next token of the input as a {@code float}. |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2364 |
* This method will throw {@code InputMismatchException} |
2 | 2365 |
* if the next token cannot be translated into a valid float value as |
2366 |
* described below. If the translation is successful, the scanner advances |
|
2367 |
* past the input that matched. |
|
2368 |
* |
|
2369 |
* <p> If the next token matches the <a |
|
2370 |
* href="#Float-regex"><i>Float</i></a> regular expression defined above |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2371 |
* then the token is converted into a {@code float} value as if by |
2 | 2372 |
* removing all locale specific prefixes, group separators, and locale |
2373 |
* specific suffixes, then mapping non-ASCII digits into ASCII |
|
2374 |
* digits via {@link Character#digit Character.digit}, prepending a |
|
2375 |
* negative sign (-) if the locale specific negative prefixes and suffixes |
|
2376 |
* were present, and passing the resulting string to |
|
2377 |
* {@link Float#parseFloat Float.parseFloat}. If the token matches |
|
2378 |
* the localized NaN or infinity strings, then either "Nan" or "Infinity" |
|
2379 |
* is passed to {@link Float#parseFloat(String) Float.parseFloat} as |
|
2380 |
* appropriate. |
|
2381 |
* |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2382 |
* @return the {@code float} scanned from the input |
2 | 2383 |
* @throws InputMismatchException |
2384 |
* if the next token does not match the <i>Float</i> |
|
2385 |
* regular expression, or is out of range |
|
2386 |
* @throws NoSuchElementException if input is exhausted |
|
2387 |
* @throws IllegalStateException if this scanner is closed |
|
2388 |
*/ |
|
2389 |
public float nextFloat() { |
|
2390 |
// Check cached result |
|
2391 |
if ((typeCache != null) && (typeCache instanceof Float)) { |
|
2392 |
float val = ((Float)typeCache).floatValue(); |
|
2393 |
useTypeCache(); |
|
2394 |
return val; |
|
2395 |
} |
|
2396 |
setRadix(10); |
|
2397 |
clearCaches(); |
|
2398 |
try { |
|
2399 |
return Float.parseFloat(processFloatToken(next(floatPattern()))); |
|
2400 |
} catch (NumberFormatException nfe) { |
|
2401 |
position = matcher.start(); // don't skip bad token |
|
2402 |
throw new InputMismatchException(nfe.getMessage()); |
|
2403 |
} |
|
2404 |
} |
|
2405 |
||
2406 |
/** |
|
2407 |
* Returns true if the next token in this scanner's input can be |
|
2408 |
* interpreted as a double value using the {@link #nextDouble} |
|
2409 |
* method. The scanner does not advance past any input. |
|
2410 |
* |
|
2411 |
* @return true if and only if this scanner's next token is a valid |
|
2412 |
* double value |
|
2413 |
* @throws IllegalStateException if this scanner is closed |
|
2414 |
*/ |
|
2415 |
public boolean hasNextDouble() { |
|
2416 |
setRadix(10); |
|
2417 |
boolean result = hasNext(floatPattern()); |
|
2418 |
if (result) { // Cache it |
|
2419 |
try { |
|
2420 |
String s = processFloatToken(hasNextResult); |
|
2421 |
typeCache = Double.valueOf(Double.parseDouble(s)); |
|
2422 |
} catch (NumberFormatException nfe) { |
|
2423 |
result = false; |
|
2424 |
} |
|
2425 |
} |
|
2426 |
return result; |
|
2427 |
} |
|
2428 |
||
2429 |
/** |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2430 |
* Scans the next token of the input as a {@code double}. |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2431 |
* This method will throw {@code InputMismatchException} |
2 | 2432 |
* if the next token cannot be translated into a valid double value. |
2433 |
* If the translation is successful, the scanner advances past the input |
|
2434 |
* that matched. |
|
2435 |
* |
|
2436 |
* <p> If the next token matches the <a |
|
2437 |
* href="#Float-regex"><i>Float</i></a> regular expression defined above |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2438 |
* then the token is converted into a {@code double} value as if by |
2 | 2439 |
* removing all locale specific prefixes, group separators, and locale |
2440 |
* specific suffixes, then mapping non-ASCII digits into ASCII |
|
2441 |
* digits via {@link Character#digit Character.digit}, prepending a |
|
2442 |
* negative sign (-) if the locale specific negative prefixes and suffixes |
|
2443 |
* were present, and passing the resulting string to |
|
2444 |
* {@link Double#parseDouble Double.parseDouble}. If the token matches |
|
2445 |
* the localized NaN or infinity strings, then either "Nan" or "Infinity" |
|
2446 |
* is passed to {@link Double#parseDouble(String) Double.parseDouble} as |
|
2447 |
* appropriate. |
|
2448 |
* |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2449 |
* @return the {@code double} scanned from the input |
2 | 2450 |
* @throws InputMismatchException |
2451 |
* if the next token does not match the <i>Float</i> |
|
2452 |
* regular expression, or is out of range |
|
2453 |
* @throws NoSuchElementException if the input is exhausted |
|
2454 |
* @throws IllegalStateException if this scanner is closed |
|
2455 |
*/ |
|
2456 |
public double nextDouble() { |
|
2457 |
// Check cached result |
|
2458 |
if ((typeCache != null) && (typeCache instanceof Double)) { |
|
2459 |
double val = ((Double)typeCache).doubleValue(); |
|
2460 |
useTypeCache(); |
|
2461 |
return val; |
|
2462 |
} |
|
2463 |
setRadix(10); |
|
2464 |
clearCaches(); |
|
2465 |
// Search for next float |
|
2466 |
try { |
|
2467 |
return Double.parseDouble(processFloatToken(next(floatPattern()))); |
|
2468 |
} catch (NumberFormatException nfe) { |
|
2469 |
position = matcher.start(); // don't skip bad token |
|
2470 |
throw new InputMismatchException(nfe.getMessage()); |
|
2471 |
} |
|
2472 |
} |
|
2473 |
||
2474 |
// Convenience methods for scanning multi precision numbers |
|
2475 |
||
2476 |
/** |
|
2477 |
* Returns true if the next token in this scanner's input can be |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2478 |
* interpreted as a {@code BigInteger} in the default radix using the |
2 | 2479 |
* {@link #nextBigInteger} method. The scanner does not advance past any |
2480 |
* input. |
|
2481 |
* |
|
2482 |
* @return true if and only if this scanner's next token is a valid |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2483 |
* {@code BigInteger} |
2 | 2484 |
* @throws IllegalStateException if this scanner is closed |
2485 |
*/ |
|
2486 |
public boolean hasNextBigInteger() { |
|
2487 |
return hasNextBigInteger(defaultRadix); |
|
2488 |
} |
|
2489 |
||
2490 |
/** |
|
2491 |
* Returns true if the next token in this scanner's input can be |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2492 |
* interpreted as a {@code BigInteger} in the specified radix using |
2 | 2493 |
* the {@link #nextBigInteger} method. The scanner does not advance past |
2494 |
* any input. |
|
2495 |
* |
|
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2496 |
* <p>If the radix is less than {@link Character#MIN_RADIX Character.MIN_RADIX} |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2497 |
* or greater than {@link Character#MAX_RADIX Character.MAX_RADIX}, then an |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2498 |
* {@code IllegalArgumentException} is thrown. |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2499 |
* |
2 | 2500 |
* @param radix the radix used to interpret the token as an integer |
2501 |
* @return true if and only if this scanner's next token is a valid |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2502 |
* {@code BigInteger} |
2 | 2503 |
* @throws IllegalStateException if this scanner is closed |
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2504 |
* @throws IllegalArgumentException if the radix is out of range |
2 | 2505 |
*/ |
2506 |
public boolean hasNextBigInteger(int radix) { |
|
2507 |
setRadix(radix); |
|
2508 |
boolean result = hasNext(integerPattern()); |
|
2509 |
if (result) { // Cache it |
|
2510 |
try { |
|
2511 |
String s = (matcher.group(SIMPLE_GROUP_INDEX) == null) ? |
|
2512 |
processIntegerToken(hasNextResult) : |
|
2513 |
hasNextResult; |
|
2514 |
typeCache = new BigInteger(s, radix); |
|
2515 |
} catch (NumberFormatException nfe) { |
|
2516 |
result = false; |
|
2517 |
} |
|
2518 |
} |
|
2519 |
return result; |
|
2520 |
} |
|
2521 |
||
2522 |
/** |
|
2523 |
* Scans the next token of the input as a {@link java.math.BigInteger |
|
2524 |
* BigInteger}. |
|
2525 |
* |
|
2526 |
* <p> An invocation of this method of the form |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2527 |
* {@code nextBigInteger()} behaves in exactly the same way as the |
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2528 |
* invocation {@code nextBigInteger(radix)}, where {@code radix} |
2 | 2529 |
* is the default radix of this scanner. |
2530 |
* |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2531 |
* @return the {@code BigInteger} scanned from the input |
2 | 2532 |
* @throws InputMismatchException |
2533 |
* if the next token does not match the <i>Integer</i> |
|
2534 |
* regular expression, or is out of range |
|
2535 |
* @throws NoSuchElementException if the input is exhausted |
|
2536 |
* @throws IllegalStateException if this scanner is closed |
|
2537 |
*/ |
|
2538 |
public BigInteger nextBigInteger() { |
|
2539 |
return nextBigInteger(defaultRadix); |
|
2540 |
} |
|
2541 |
||
2542 |
/** |
|
2543 |
* Scans the next token of the input as a {@link java.math.BigInteger |
|
2544 |
* BigInteger}. |
|
2545 |
* |
|
2546 |
* <p> If the next token matches the <a |
|
2547 |
* href="#Integer-regex"><i>Integer</i></a> regular expression defined |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2548 |
* above then the token is converted into a {@code BigInteger} value as if |
2 | 2549 |
* by removing all group separators, mapping non-ASCII digits into ASCII |
2550 |
* digits via the {@link Character#digit Character.digit}, and passing the |
|
2551 |
* resulting string to the {@link |
|
2552 |
* java.math.BigInteger#BigInteger(java.lang.String) |
|
2553 |
* BigInteger(String, int)} constructor with the specified radix. |
|
2554 |
* |
|
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2555 |
* <p>If the radix is less than {@link Character#MIN_RADIX Character.MIN_RADIX} |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2556 |
* or greater than {@link Character#MAX_RADIX Character.MAX_RADIX}, then an |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2557 |
* {@code IllegalArgumentException} is thrown. |
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2558 |
* |
2 | 2559 |
* @param radix the radix used to interpret the token |
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2560 |
* @return the {@code BigInteger} scanned from the input |
2 | 2561 |
* @throws InputMismatchException |
2562 |
* if the next token does not match the <i>Integer</i> |
|
2563 |
* regular expression, or is out of range |
|
2564 |
* @throws NoSuchElementException if the input is exhausted |
|
2565 |
* @throws IllegalStateException if this scanner is closed |
|
41824
ebb396875090
8166261: Scanner.nextInt(int) (and similar methods) throws PatternSyntaxException
sherman
parents:
39141
diff
changeset
|
2566 |
* @throws IllegalArgumentException if the radix is out of range |
2 | 2567 |
*/ |
2568 |
public BigInteger nextBigInteger(int radix) { |
|
2569 |
// Check cached result |
|
2570 |
if ((typeCache != null) && (typeCache instanceof BigInteger) |
|
2571 |
&& this.radix == radix) { |
|
2572 |
BigInteger val = (BigInteger)typeCache; |
|
2573 |
useTypeCache(); |
|
2574 |
return val; |
|
2575 |
} |
|
2576 |
setRadix(radix); |
|
2577 |
clearCaches(); |
|
2578 |
// Search for next int |
|
2579 |
try { |
|
2580 |
String s = next(integerPattern()); |
|
2581 |
if (matcher.group(SIMPLE_GROUP_INDEX) == null) |
|
2582 |
s = processIntegerToken(s); |
|
2583 |
return new BigInteger(s, radix); |
|
2584 |
} catch (NumberFormatException nfe) { |
|
2585 |
position = matcher.start(); // don't skip bad token |
|
2586 |
throw new InputMismatchException(nfe.getMessage()); |
|
2587 |
} |
|
2588 |
} |
|
2589 |
||
2590 |
/** |
|
2591 |
* Returns true if the next token in this scanner's input can be |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2592 |
* interpreted as a {@code BigDecimal} using the |
2 | 2593 |
* {@link #nextBigDecimal} method. The scanner does not advance past any |
2594 |
* input. |
|
2595 |
* |
|
2596 |
* @return true if and only if this scanner's next token is a valid |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2597 |
* {@code BigDecimal} |
2 | 2598 |
* @throws IllegalStateException if this scanner is closed |
2599 |
*/ |
|
2600 |
public boolean hasNextBigDecimal() { |
|
2601 |
setRadix(10); |
|
2602 |
boolean result = hasNext(decimalPattern()); |
|
2603 |
if (result) { // Cache it |
|
2604 |
try { |
|
2605 |
String s = processFloatToken(hasNextResult); |
|
2606 |
typeCache = new BigDecimal(s); |
|
2607 |
} catch (NumberFormatException nfe) { |
|
2608 |
result = false; |
|
2609 |
} |
|
2610 |
} |
|
2611 |
return result; |
|
2612 |
} |
|
2613 |
||
2614 |
/** |
|
2615 |
* Scans the next token of the input as a {@link java.math.BigDecimal |
|
2616 |
* BigDecimal}. |
|
2617 |
* |
|
2618 |
* <p> If the next token matches the <a |
|
2619 |
* href="#Decimal-regex"><i>Decimal</i></a> regular expression defined |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2620 |
* above then the token is converted into a {@code BigDecimal} value as if |
2 | 2621 |
* by removing all group separators, mapping non-ASCII digits into ASCII |
2622 |
* digits via the {@link Character#digit Character.digit}, and passing the |
|
2623 |
* resulting string to the {@link |
|
2624 |
* java.math.BigDecimal#BigDecimal(java.lang.String) BigDecimal(String)} |
|
2625 |
* constructor. |
|
2626 |
* |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2627 |
* @return the {@code BigDecimal} scanned from the input |
2 | 2628 |
* @throws InputMismatchException |
2629 |
* if the next token does not match the <i>Decimal</i> |
|
2630 |
* regular expression, or is out of range |
|
2631 |
* @throws NoSuchElementException if the input is exhausted |
|
2632 |
* @throws IllegalStateException if this scanner is closed |
|
2633 |
*/ |
|
2634 |
public BigDecimal nextBigDecimal() { |
|
2635 |
// Check cached result |
|
2636 |
if ((typeCache != null) && (typeCache instanceof BigDecimal)) { |
|
2637 |
BigDecimal val = (BigDecimal)typeCache; |
|
2638 |
useTypeCache(); |
|
2639 |
return val; |
|
2640 |
} |
|
2641 |
setRadix(10); |
|
2642 |
clearCaches(); |
|
2643 |
// Search for next float |
|
2644 |
try { |
|
2645 |
String s = processFloatToken(next(decimalPattern())); |
|
2646 |
return new BigDecimal(s); |
|
2647 |
} catch (NumberFormatException nfe) { |
|
2648 |
position = matcher.start(); // don't skip bad token |
|
2649 |
throw new InputMismatchException(nfe.getMessage()); |
|
2650 |
} |
|
2651 |
} |
|
2652 |
||
2653 |
/** |
|
2654 |
* Resets this scanner. |
|
2655 |
* |
|
2656 |
* <p> Resetting a scanner discards all of its explicit state |
|
32650 | 2657 |
* information which may have been changed by invocations of |
2658 |
* {@link #useDelimiter useDelimiter()}, |
|
2659 |
* {@link #useLocale useLocale()}, or |
|
2660 |
* {@link #useRadix useRadix()}. |
|
2 | 2661 |
* |
2662 |
* <p> An invocation of this method of the form |
|
32108
aa5490a167ee
8133188: docs: replace <tt> tags (obsolete in html5) for java.util
avstepan
parents:
25859
diff
changeset
|
2663 |
* {@code scanner.reset()} behaves in exactly the same way as the |
2 | 2664 |
* invocation |
2665 |
* |
|
18156 | 2666 |
* <blockquote><pre>{@code |
2 | 2667 |
* scanner.useDelimiter("\\p{javaWhitespace}+") |
16010
2727163b5df5
7092447: Clarify the default locale used in each locale sensitive operation
naoto
parents:
14342
diff
changeset
|
2668 |
* .useLocale(Locale.getDefault(Locale.Category.FORMAT)) |
2 | 2669 |
* .useRadix(10); |
18156 | 2670 |
* }</pre></blockquote> |
2 | 2671 |
* |
2672 |
* @return this scanner |
|
2673 |
* |
|
2674 |
* @since 1.6 |
|
2675 |
*/ |
|
2676 |
public Scanner reset() { |
|
2677 |
delimPattern = WHITESPACE_PATTERN; |
|
6489
9e7015635425
4700857: RFE: separating user locale and user interface locale
naoto
parents:
5998
diff
changeset
|
2678 |
useLocale(Locale.getDefault(Locale.Category.FORMAT)); |
2 | 2679 |
useRadix(10); |
2680 |
clearCaches(); |
|
32650 | 2681 |
modCount++; |
2 | 2682 |
return this; |
2683 |
} |
|
32650 | 2684 |
|
2685 |
/** |
|
2686 |
* Returns a stream of delimiter-separated tokens from this scanner. The |
|
2687 |
* stream contains the same tokens that would be returned, starting from |
|
2688 |
* this scanner's current state, by calling the {@link #next} method |
|
2689 |
* repeatedly until the {@link #hasNext} method returns false. |
|
2690 |
* |
|
2691 |
* <p>The resulting stream is sequential and ordered. All stream elements are |
|
2692 |
* non-null. |
|
2693 |
* |
|
2694 |
* <p>Scanning starts upon initiation of the terminal stream operation, using the |
|
2695 |
* current state of this scanner. Subsequent calls to any methods on this scanner |
|
2696 |
* other than {@link #close} and {@link #ioException} may return undefined results |
|
2697 |
* or may cause undefined effects on the returned stream. The returned stream's source |
|
2698 |
* {@code Spliterator} is <em>fail-fast</em> and will, on a best-effort basis, throw a |
|
2699 |
* {@link java.util.ConcurrentModificationException} if any such calls are detected |
|
2700 |
* during stream pipeline execution. |
|
2701 |
* |
|
2702 |
* <p>After stream pipeline execution completes, this scanner is left in an indeterminate |
|
2703 |
* state and cannot be reused. |
|
2704 |
* |
|
2705 |
* <p>If this scanner contains a resource that must be released, this scanner |
|
2706 |
* should be closed, either by calling its {@link #close} method, or by |
|
2707 |
* closing the returned stream. Closing the stream will close the underlying scanner. |
|
2708 |
* {@code IllegalStateException} is thrown if the scanner has been closed when this |
|
2709 |
* method is called, or if this scanner is closed during stream pipeline execution. |
|
2710 |
* |
|
2711 |
* <p>This method might block waiting for more input. |
|
2712 |
* |
|
2713 |
* @apiNote |
|
2714 |
* For example, the following code will create a list of |
|
2715 |
* comma-delimited tokens from a string: |
|
2716 |
* |
|
2717 |
* <pre>{@code |
|
2718 |
* List<String> result = new Scanner("abc,def,,ghi") |
|
2719 |
* .useDelimiter(",") |
|
2720 |
* .tokens() |
|
2721 |
* .collect(Collectors.toList()); |
|
2722 |
* }</pre> |
|
2723 |
* |
|
2724 |
* <p>The resulting list would contain {@code "abc"}, {@code "def"}, |
|
2725 |
* the empty string, and {@code "ghi"}. |
|
2726 |
* |
|
2727 |
* @return a sequential stream of token strings |
|
2728 |
* @throws IllegalStateException if this scanner is closed |
|
35302
e4d2275861c3
8136494: Update "@since 1.9" to "@since 9" to match java.version.specification
iris
parents:
32650
diff
changeset
|
2729 |
* @since 9 |
32650 | 2730 |
*/ |
2731 |
public Stream<String> tokens() { |
|
2732 |
ensureOpen(); |
|
2733 |
Stream<String> stream = StreamSupport.stream(new TokenSpliterator(), false); |
|
2734 |
return stream.onClose(this::close); |
|
2735 |
} |
|
2736 |
||
2737 |
class TokenSpliterator extends Spliterators.AbstractSpliterator<String> { |
|
2738 |
int expectedCount = -1; |
|
2739 |
||
2740 |
TokenSpliterator() { |
|
2741 |
super(Long.MAX_VALUE, |
|
2742 |
Spliterator.IMMUTABLE | Spliterator.NONNULL | Spliterator.ORDERED); |
|
2743 |
} |
|
2744 |
||
2745 |
@Override |
|
2746 |
public boolean tryAdvance(Consumer<? super String> cons) { |
|
2747 |
if (expectedCount >= 0 && expectedCount != modCount) { |
|
2748 |
throw new ConcurrentModificationException(); |
|
2749 |
} |
|
2750 |
||
2751 |
if (hasNext()) { |
|
2752 |
String token = next(); |
|
2753 |
expectedCount = modCount; |
|
2754 |
cons.accept(token); |
|
2755 |
if (expectedCount != modCount) { |
|
2756 |
throw new ConcurrentModificationException(); |
|
2757 |
} |
|
2758 |
return true; |
|
2759 |
} else { |
|
2760 |
expectedCount = modCount; |
|
2761 |
return false; |
|
2762 |
} |
|
2763 |
} |
|
2764 |
} |
|
2765 |
||
2766 |
/** |
|
2767 |
* Returns a stream of match results from this scanner. The stream |
|
2768 |
* contains the same results in the same order that would be returned by |
|
2769 |
* calling {@code findWithinHorizon(pattern, 0)} and then {@link #match} |
|
2770 |
* successively as long as {@link #findWithinHorizon findWithinHorizon()} |
|
2771 |
* finds matches. |
|
2772 |
* |
|
2773 |
* <p>The resulting stream is sequential and ordered. All stream elements are |
|
2774 |
* non-null. |
|
2775 |
* |
|
2776 |
* <p>Scanning starts upon initiation of the terminal stream operation, using the |
|
2777 |
* current state of this scanner. Subsequent calls to any methods on this scanner |
|
2778 |
* other than {@link #close} and {@link #ioException} may return undefined results |
|
2779 |
* or may cause undefined effects on the returned stream. The returned stream's source |
|
2780 |
* {@code Spliterator} is <em>fail-fast</em> and will, on a best-effort basis, throw a |
|
2781 |
* {@link java.util.ConcurrentModificationException} if any such calls are detected |
|
2782 |
* during stream pipeline execution. |
|
2783 |
* |
|
2784 |
* <p>After stream pipeline execution completes, this scanner is left in an indeterminate |
|
2785 |
* state and cannot be reused. |
|
2786 |
* |
|
2787 |
* <p>If this scanner contains a resource that must be released, this scanner |
|
2788 |
* should be closed, either by calling its {@link #close} method, or by |
|
2789 |
* closing the returned stream. Closing the stream will close the underlying scanner. |
|
2790 |
* {@code IllegalStateException} is thrown if the scanner has been closed when this |
|
2791 |
* method is called, or if this scanner is closed during stream pipeline execution. |
|
2792 |
* |
|
2793 |
* <p>As with the {@link #findWithinHorizon findWithinHorizon()} methods, this method |
|
2794 |
* might block waiting for additional input, and it might buffer an unbounded amount of |
|
2795 |
* input searching for a match. |
|
2796 |
* |
|
2797 |
* @apiNote |
|
2798 |
* For example, the following code will read a file and return a list |
|
2799 |
* of all sequences of characters consisting of seven or more Latin capital |
|
2800 |
* letters: |
|
2801 |
* |
|
2802 |
* <pre>{@code |
|
2803 |
* try (Scanner sc = new Scanner(Paths.get("input.txt"))) { |
|
2804 |
* Pattern pat = Pattern.compile("[A-Z]{7,}"); |
|
2805 |
* List<String> capWords = sc.findAll(pat) |
|
2806 |
* .map(MatchResult::group) |
|
2807 |
* .collect(Collectors.toList()); |
|
2808 |
* } |
|
2809 |
* }</pre> |
|
2810 |
* |
|
2811 |
* @param pattern the pattern to be matched |
|
2812 |
* @return a sequential stream of match results |
|
2813 |
* @throws NullPointerException if pattern is null |
|
2814 |
* @throws IllegalStateException if this scanner is closed |
|
35302
e4d2275861c3
8136494: Update "@since 1.9" to "@since 9" to match java.version.specification
iris
parents:
32650
diff
changeset
|
2815 |
* @since 9 |
32650 | 2816 |
*/ |
2817 |
public Stream<MatchResult> findAll(Pattern pattern) { |
|
2818 |
Objects.requireNonNull(pattern); |
|
2819 |
ensureOpen(); |
|
2820 |
Stream<MatchResult> stream = StreamSupport.stream(new FindSpliterator(pattern), false); |
|
2821 |
return stream.onClose(this::close); |
|
2822 |
} |
|
2823 |
||
2824 |
/** |
|
2825 |
* Returns a stream of match results that match the provided pattern string. |
|
2826 |
* The effect is equivalent to the following code: |
|
2827 |
* |
|
2828 |
* <pre>{@code |
|
2829 |
* scanner.findAll(Pattern.compile(patString)) |
|
2830 |
* }</pre> |
|
2831 |
* |
|
2832 |
* @param patString the pattern string |
|
2833 |
* @return a sequential stream of match results |
|
2834 |
* @throws NullPointerException if patString is null |
|
2835 |
* @throws IllegalStateException if this scanner is closed |
|
2836 |
* @throws PatternSyntaxException if the regular expression's syntax is invalid |
|
35302
e4d2275861c3
8136494: Update "@since 1.9" to "@since 9" to match java.version.specification
iris
parents:
32650
diff
changeset
|
2837 |
* @since 9 |
32650 | 2838 |
* @see java.util.regex.Pattern |
2839 |
*/ |
|
2840 |
public Stream<MatchResult> findAll(String patString) { |
|
2841 |
Objects.requireNonNull(patString); |
|
2842 |
ensureOpen(); |
|
2843 |
return findAll(patternCache.forName(patString)); |
|
2844 |
} |
|
2845 |
||
2846 |
class FindSpliterator extends Spliterators.AbstractSpliterator<MatchResult> { |
|
2847 |
final Pattern pattern; |
|
2848 |
int expectedCount = -1; |
|
2849 |
||
2850 |
FindSpliterator(Pattern pattern) { |
|
2851 |
super(Long.MAX_VALUE, |
|
2852 |
Spliterator.IMMUTABLE | Spliterator.NONNULL | Spliterator.ORDERED); |
|
2853 |
this.pattern = pattern; |
|
2854 |
} |
|
2855 |
||
2856 |
@Override |
|
2857 |
public boolean tryAdvance(Consumer<? super MatchResult> cons) { |
|
2858 |
ensureOpen(); |
|
2859 |
if (expectedCount >= 0) { |
|
2860 |
if (expectedCount != modCount) { |
|
2861 |
throw new ConcurrentModificationException(); |
|
2862 |
} |
|
2863 |
} else { |
|
2864 |
expectedCount = modCount; |
|
2865 |
} |
|
2866 |
||
2867 |
while (true) { |
|
2868 |
// assert expectedCount == modCount |
|
2869 |
if (findPatternInBuffer(pattern, 0)) { // doesn't increment modCount |
|
2870 |
cons.accept(matcher.toMatchResult()); |
|
2871 |
if (expectedCount != modCount) { |
|
2872 |
throw new ConcurrentModificationException(); |
|
2873 |
} |
|
2874 |
return true; |
|
2875 |
} |
|
2876 |
if (needInput) |
|
2877 |
readInput(); // doesn't increment modCount |
|
2878 |
else |
|
2879 |
return false; // reached end of input |
|
2880 |
} |
|
2881 |
} |
|
2882 |
} |
|
35787 | 2883 |
|
2884 |
/** Small LRU cache of Patterns. */ |
|
2885 |
private static class PatternLRUCache { |
|
2886 |
||
2887 |
private Pattern[] oa = null; |
|
2888 |
private final int size; |
|
2889 |
||
2890 |
PatternLRUCache(int size) { |
|
2891 |
this.size = size; |
|
2892 |
} |
|
2893 |
||
2894 |
boolean hasName(Pattern p, String s) { |
|
2895 |
return p.pattern().equals(s); |
|
2896 |
} |
|
2897 |
||
2898 |
void moveToFront(Object[] oa, int i) { |
|
2899 |
Object ob = oa[i]; |
|
2900 |
for (int j = i; j > 0; j--) |
|
2901 |
oa[j] = oa[j - 1]; |
|
2902 |
oa[0] = ob; |
|
2903 |
} |
|
2904 |
||
2905 |
Pattern forName(String name) { |
|
2906 |
if (oa == null) { |
|
2907 |
Pattern[] temp = new Pattern[size]; |
|
2908 |
oa = temp; |
|
2909 |
} else { |
|
2910 |
for (int i = 0; i < oa.length; i++) { |
|
2911 |
Pattern ob = oa[i]; |
|
2912 |
if (ob == null) |
|
2913 |
continue; |
|
2914 |
if (hasName(ob, name)) { |
|
2915 |
if (i > 0) |
|
2916 |
moveToFront(oa, i); |
|
2917 |
return ob; |
|
2918 |
} |
|
2919 |
} |
|
2920 |
} |
|
2921 |
||
2922 |
// Create a new object |
|
2923 |
Pattern ob = Pattern.compile(name); |
|
2924 |
oa[oa.length - 1] = ob; |
|
2925 |
moveToFront(oa, oa.length - 1); |
|
2926 |
return ob; |
|
2927 |
} |
|
2928 |
} |
|
2 | 2929 |
} |