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CookCC - a Lexer / Parser (LALR(1)) Project
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.xerces.impl.xpath.regex;
import java.text.CharacterIterator;
/**
* An instance of this class has ranges captured in matching.
*
* @xerces.internal
*
* @see RegularExpression#matches(char[], int, int, Match)
* @see RegularExpression#matches(char[], Match)
* @see RegularExpression#matches(java.text.CharacterIterator, Match)
* @see RegularExpression#matches(java.lang.String, int, int, Match)
* @see RegularExpression#matches(java.lang.String, Match)
* @author TAMURA Kent <[email protected]>
* @version $Id: Match.java 446721 2006-09-15 20:35:34Z mrglavas $
*/
public class Match implements Cloneable {
int[] beginpos = null;
int[] endpos = null;
int nofgroups = 0;
CharacterIterator ciSource = null;
String strSource = null;
char[] charSource = null;
/**
* Creates an instance.
*/
public Match() {
}
/**
*
*/
public synchronized Object clone() {
Match ma = new Match();
if (this.nofgroups > 0) {
ma.setNumberOfGroups(this.nofgroups);
if (this.ciSource != null) ma.setSource(this.ciSource);
if (this.strSource != null) ma.setSource(this.strSource);
for (int i = 0; i < this.nofgroups; i ++) {
ma.setBeginning(i, this.getBeginning(i));
ma.setEnd(i, this.getEnd(i));
}
}
return ma;
}
/**
*
*/
protected void setNumberOfGroups(int n) {
int oldn = this.nofgroups;
this.nofgroups = n;
if (oldn <= 0
|| oldn < n || n*2 < oldn) {
this.beginpos = new int[n];
this.endpos = new int[n];
}
for (int i = 0; i < n; i ++) {
this.beginpos[i] = -1;
this.endpos[i] = -1;
}
}
/**
*
*/
protected void setSource(CharacterIterator ci) {
this.ciSource = ci;
this.strSource = null;
this.charSource = null;
}
/**
*
*/
protected void setSource(String str) {
this.ciSource = null;
this.strSource = str;
this.charSource = null;
}
/**
*
*/
protected void setSource(char[] chars) {
this.ciSource = null;
this.strSource = null;
this.charSource = chars;
}
/**
*
*/
protected void setBeginning(int index, int v) {
this.beginpos[index] = v;
}
/**
*
*/
protected void setEnd(int index, int v) {
this.endpos[index] = v;
}
/**
* Return the number of regular expression groups.
* This method returns 1 when the regular expression has no capturing-parenthesis.
*/
public int getNumberOfGroups() {
if (this.nofgroups <= 0)
throw new IllegalStateException("A result is not set.");
return this.nofgroups;
}
/**
* Return a start position in the target text matched to specified regular expression group.
*
* @param index Less than getNumberOfGroups().
*/
public int getBeginning(int index) {
if (this.beginpos == null)
throw new IllegalStateException("A result is not set.");
if (index < 0 || this.nofgroups <= index)
throw new IllegalArgumentException("The parameter must be less than "
+this.nofgroups+": "+index);
return this.beginpos[index];
}
/**
* Return an end position in the target text matched to specified regular expression group.
*
* @param index Less than getNumberOfGroups().
*/
public int getEnd(int index) {
if (this.endpos == null)
throw new IllegalStateException("A result is not set.");
if (index < 0 || this.nofgroups <= index)
throw new IllegalArgumentException("The parameter must be less than "
+this.nofgroups+": "+index);
return this.endpos[index];
}
/**
* Return an substring of the target text matched to specified regular expression group.
*
* @param index Less than getNumberOfGroups().
*/
public String getCapturedText(int index) {
if (this.beginpos == null)
throw new IllegalStateException("match() has never been called.");
if (index < 0 || this.nofgroups <= index)
throw new IllegalArgumentException("The parameter must be less than "
+this.nofgroups+": "+index);
String ret;
int begin = this.beginpos[index], end = this.endpos[index];
if (begin < 0 || end < 0) return null;
if (this.ciSource != null) {
ret = REUtil.substring(this.ciSource, begin, end);
} else if (this.strSource != null) {
ret = this.strSource.substring(begin, end);
} else {
ret = new String(this.charSource, begin, end-begin);
}
return ret;
}
}