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/*
* 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.tools.ant.util.regexp;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.tools.ant.BuildException;
/***
* Regular expression implementation using the JDK 1.4 regular expression package
*/
public class Jdk14RegexpRegexp extends Jdk14RegexpMatcher implements Regexp {
private static final int DECIMAL = 10;
/** Constructor for Jdk14RegexpRegexp */
public Jdk14RegexpRegexp() {
super();
}
/**
* Convert ant regexp substitution option to jdk1.4 options.
*
* @param options the ant regexp options
* @return the jdk14 substition options
*/
protected int getSubsOptions(int options) {
int subsOptions = REPLACE_FIRST;
if (RegexpUtil.hasFlag(options, REPLACE_ALL)) {
subsOptions = REPLACE_ALL;
}
return subsOptions;
}
/**
* Perform a substitution on the regular expression.
* @param input The string to substitute on
* @param argument The string which defines the substitution
* @param options The list of options for the match and replace.
* @return the result of the operation
* @throws BuildException on error
*/
public String substitute(String input, String argument, int options)
throws BuildException {
// translate \1 to $(1) so that the Matcher will work
StringBuffer subst = new StringBuffer();
for (int i = 0; i < argument.length(); i++) {
char c = argument.charAt(i);
if (c == '$') {
subst.append('\\');
subst.append('$');
} else if (c == '\\') {
if (++i < argument.length()) {
c = argument.charAt(i);
int value = Character.digit(c, DECIMAL);
if (value > -1) {
subst.append("$").append(value);
} else {
subst.append(c);
}
} else {
// TODO - should throw an exception instead?
subst.append('\\');
}
} else {
subst.append(c);
}
}
argument = subst.toString();
int sOptions = getSubsOptions(options);
Pattern p = getCompiledPattern(options);
StringBuffer sb = new StringBuffer();
Matcher m = p.matcher(input);
if (RegexpUtil.hasFlag(sOptions, REPLACE_ALL)) {
sb.append(m.replaceAll(argument));
} else {
boolean res = m.find();
if (res) {
m.appendReplacement(sb, argument);
m.appendTail(sb);
} else {
sb.append(input);
}
}
return sb.toString();
}
}
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