340 lines
9.2 KiB
Java
340 lines
9.2 KiB
Java
/* Matcher.java -- Instance of a regular expression applied to a char sequence.
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Copyright (C) 2002, 2004, 2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.util.regex;
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import gnu.java.util.regex.CharIndexed;
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import gnu.java.util.regex.RE;
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import gnu.java.util.regex.REMatch;
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/**
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* Instance of a regular expression applied to a char sequence.
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*
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* @since 1.4
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*/
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public final class Matcher implements MatchResult
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{
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private Pattern pattern;
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private CharSequence input;
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// We use CharIndexed as an input object to the getMatch method in order
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// that /\G/ (the end of the previous match) may work. The information
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// of the previous match is stored in the CharIndexed object.
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private CharIndexed inputCharIndexed;
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private int position;
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private int appendPosition;
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private REMatch match;
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Matcher(Pattern pattern, CharSequence input)
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{
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this.pattern = pattern;
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this.input = input;
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this.inputCharIndexed = RE.makeCharIndexed(input, 0);
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}
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/**
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* @param sb The target string buffer
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* @param replacement The replacement string
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*
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* @exception IllegalStateException If no match has yet been attempted,
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* or if the previous match operation failed
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* @exception IndexOutOfBoundsException If the replacement string refers
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* to a capturing group that does not exist in the pattern
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*/
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public Matcher appendReplacement (StringBuffer sb, String replacement)
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throws IllegalStateException
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{
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assertMatchOp();
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sb.append(input.subSequence(appendPosition,
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match.getStartIndex()).toString());
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sb.append(RE.getReplacement(replacement, match,
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RE.REG_REPLACE_USE_BACKSLASHESCAPE));
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appendPosition = match.getEndIndex();
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return this;
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}
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/**
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* @param sb The target string buffer
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*/
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public StringBuffer appendTail (StringBuffer sb)
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{
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sb.append(input.subSequence(appendPosition, input.length()).toString());
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return sb;
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}
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/**
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* @exception IllegalStateException If no match has yet been attempted,
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* or if the previous match operation failed
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*/
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public int end ()
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throws IllegalStateException
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{
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assertMatchOp();
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return match.getEndIndex();
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}
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/**
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* @param group The index of a capturing group in this matcher's pattern
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*
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* @exception IllegalStateException If no match has yet been attempted,
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* or if the previous match operation failed
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* @exception IndexOutOfBoundsException If the replacement string refers
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* to a capturing group that does not exist in the pattern
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*/
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public int end (int group)
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throws IllegalStateException
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{
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assertMatchOp();
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return match.getEndIndex(group);
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}
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public boolean find ()
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{
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boolean first = (match == null);
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match = pattern.getRE().getMatch(inputCharIndexed, position);
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if (match != null)
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{
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int endIndex = match.getEndIndex();
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// Are we stuck at the same position?
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if (!first && endIndex == position)
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{
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match = null;
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// Not at the end of the input yet?
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if (position < input.length() - 1)
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{
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position++;
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return find(position);
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}
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else
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return false;
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}
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position = endIndex;
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return true;
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}
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return false;
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}
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/**
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* @param start The index to start the new pattern matching
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*
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* @exception IndexOutOfBoundsException If the replacement string refers
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* to a capturing group that does not exist in the pattern
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*/
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public boolean find (int start)
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{
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match = pattern.getRE().getMatch(inputCharIndexed, start);
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if (match != null)
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{
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position = match.getEndIndex();
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return true;
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}
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return false;
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}
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/**
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* @exception IllegalStateException If no match has yet been attempted,
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* or if the previous match operation failed
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*/
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public String group ()
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{
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assertMatchOp();
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return match.toString();
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}
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/**
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* @param group The index of a capturing group in this matcher's pattern
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*
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* @exception IllegalStateException If no match has yet been attempted,
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* or if the previous match operation failed
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* @exception IndexOutOfBoundsException If the replacement string refers
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* to a capturing group that does not exist in the pattern
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*/
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public String group (int group)
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throws IllegalStateException
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{
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assertMatchOp();
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return match.toString(group);
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}
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/**
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* @param replacement The replacement string
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*/
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public String replaceFirst (String replacement)
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{
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reset();
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// Semantics might not quite match
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return pattern.getRE().substitute(input, replacement, position,
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RE.REG_REPLACE_USE_BACKSLASHESCAPE);
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}
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/**
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* @param replacement The replacement string
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*/
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public String replaceAll (String replacement)
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{
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reset();
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return pattern.getRE().substituteAll(input, replacement, position,
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RE.REG_REPLACE_USE_BACKSLASHESCAPE);
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}
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public int groupCount ()
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{
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return pattern.getRE().getNumSubs();
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}
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public boolean lookingAt ()
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{
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match = pattern.getRE().getMatch(inputCharIndexed, 0, RE.REG_FIX_STARTING_POSITION, null);
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if (match != null)
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{
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if (match.getStartIndex() == 0)
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{
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position = match.getEndIndex();
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return true;
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}
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match = null;
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}
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return false;
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}
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/**
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* Attempts to match the entire input sequence against the pattern.
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*
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* If the match succeeds then more information can be obtained via the
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* start, end, and group methods.
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*
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* @see #start()
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* @see #end()
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* @see #group()
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*/
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public boolean matches ()
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{
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match = pattern.getRE().getMatch(inputCharIndexed, 0, RE.REG_TRY_ENTIRE_MATCH|RE.REG_FIX_STARTING_POSITION, null);
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if (match != null)
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{
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if (match.getStartIndex() == 0)
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{
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position = match.getEndIndex();
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if (position == input.length())
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return true;
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}
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match = null;
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}
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return false;
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}
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/**
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* Returns the Pattern that is interpreted by this Matcher
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*/
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public Pattern pattern ()
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{
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return pattern;
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}
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public Matcher reset ()
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{
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position = 0;
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match = null;
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return this;
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}
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/**
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* @param input The new input character sequence
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*/
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public Matcher reset (CharSequence input)
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{
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this.input = input;
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this.inputCharIndexed = RE.makeCharIndexed(input, 0);
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return reset();
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}
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/**
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* @returns the index of a capturing group in this matcher's pattern
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*
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* @exception IllegalStateException If no match has yet been attempted,
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* or if the previous match operation failed
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*/
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public int start ()
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throws IllegalStateException
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{
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assertMatchOp();
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return match.getStartIndex();
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}
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/**
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* @param group The index of a capturing group in this matcher's pattern
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*
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* @exception IllegalStateException If no match has yet been attempted,
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* or if the previous match operation failed
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* @exception IndexOutOfBoundsException If the replacement string refers
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* to a capturing group that does not exist in the pattern
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*/
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public int start (int group)
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throws IllegalStateException
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{
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assertMatchOp();
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return match.getStartIndex(group);
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}
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/**
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* @return True if and only if the matcher hit the end of input.
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*/
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public boolean hitEnd()
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{
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return inputCharIndexed.hitEnd();
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}
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/**
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* @return A string expression of this matcher.
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*/
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public String toString()
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{
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StringBuilder sb = new StringBuilder();
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sb.append(this.getClass().getName())
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.append("[pattern=").append(pattern.pattern())
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.append(" region=").append("0").append(",").append(input.length())
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.append(" lastmatch=").append(match == null ? "" : match.toString())
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.append("]");
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return sb.toString();
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}
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private void assertMatchOp()
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{
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if (match == null) throw new IllegalStateException();
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}
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}
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