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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 org.apache.oro.text.regex.Perl5Substitution;
import org.apache.oro.text.regex.Substitution;
import org.apache.oro.text.regex.Util;
import org.apache.tools.ant.BuildException;
/***
* Regular expression implementation using the Jakarta Oro package
*/
public class JakartaOroRegexp extends JakartaOroMatcher implements Regexp {
private static final int DECIMAL = 10;
/** Constructor for JakartaOroRegexp */
public JakartaOroRegexp() {
super();
}
/**
* 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(final String input, final String argument, final int options)
throws BuildException {
// translate \1 to $1 so that the Perl5Substitution will work
final StringBuffer subst = new StringBuffer();
for (int i = 0; i < argument.length(); i++) {
char c = argument.charAt(i);
if (c == '$') {
subst.append('\\');
subst.append('$');
} else if (c == '\\') {
if (++i < argument.length()) {
c = argument.charAt(i);
final int value = Character.digit(c, DECIMAL);
if (value > -1) {
subst.append("$").append(value);
} else {
subst.append(c);
}
} else {
// TODO - should throw an exception instead?
subst.append('\\');
}
} else {
subst.append(c);
}
}
// Do the substitution
final Substitution s =
new Perl5Substitution(subst.toString(),
Perl5Substitution.INTERPOLATE_ALL);
return Util.substitute(matcher,
getCompiledPattern(options),
s,
input,
getSubsOptions(options));
}
/**
* Convert ant regexp substitution option to oro options.
*
* @param options the ant regexp options
* @return the oro substition options
*/
protected int getSubsOptions(final int options) {
final boolean replaceAll = RegexpUtil.hasFlag(options, REPLACE_ALL);
int subsOptions = 1;
if (replaceAll) {
subsOptions = Util.SUBSTITUTE_ALL;
}
return subsOptions;
}
}
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