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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.Vector;
import org.apache.regexp.RE;
import org.apache.regexp.RESyntaxException;
import org.apache.tools.ant.BuildException;
/**
* Implementation of RegexpMatcher for Jakarta-Regexp.
*
*/
public class JakartaRegexpMatcher implements RegexpMatcher {
private String pattern;
/**
* Set the regexp pattern from the String description.
* @param pattern the pattern to match
*/
public void setPattern(String pattern) {
this.pattern = pattern;
}
/**
* Get a String representation of the regexp pattern
* @return the pattern
*/
public String getPattern() {
return pattern;
}
/**
* Compile the pattern.
*
* @param options the ant regexp options
* @return a compiled pattern
* @exception BuildException if an error occurs
*/
protected RE getCompiledPattern(int options)
throws BuildException {
int cOptions = getCompilerOptions(options);
try {
RE reg = new RE(pattern);
reg.setMatchFlags(cOptions);
return reg;
} catch (RESyntaxException e) {
throw new BuildException(e);
}
}
/**
* Does the given argument match the pattern?
* @param argument the string to match against
* @return true if the pattern matches
* @throws BuildException on error
*/
public boolean matches(String argument) throws BuildException {
return matches(argument, MATCH_DEFAULT);
}
/**
* Does the given argument match the pattern?
* @param input the string to match against
* @param options the regex options to use
* @return true if the pattern matches
* @throws BuildException on error
*/
public boolean matches(String input, int options)
throws BuildException {
return matches(input, getCompiledPattern(options));
}
private boolean matches(String input, RE reg) {
return reg.match(input);
}
/**
* Returns a Vector of matched groups found in the argument
* using default options.
*
* <p>Group 0 will be the full match, the rest are the
* parenthesized subexpressions</p>.
*
* @param argument the string to match against
* @return the vector of groups
* @throws BuildException on error
*/
public Vector getGroups(String argument) throws BuildException {
return getGroups(argument, MATCH_DEFAULT);
}
/**
* Returns a Vector of matched groups found in the argument.
*
* <p>Group 0 will be the full match, the rest are the
* parenthesized subexpressions</p>.
*
* @param input the string to match against
* @param options the regex options to use
* @return the vector of groups
* @throws BuildException on error
*/
public Vector getGroups(String input, int options)
throws BuildException {
RE reg = getCompiledPattern(options);
if (!matches(input, reg)) {
return null;
}
Vector v = new Vector();
int cnt = reg.getParenCount();
for (int i = 0; i < cnt; i++) {
String match = reg.getParen(i);
// treat non-matching groups as empty matches
if (match == null) {
match = "";
}
v.addElement(match);
}
return v;
}
/**
* Convert the generic options to the regex compiler specific options.
* @param options the generic options
* @return the specific options
*/
protected int getCompilerOptions(int options) {
int cOptions = RE.MATCH_NORMAL;
if (RegexpUtil.hasFlag(options, MATCH_CASE_INSENSITIVE)) {
cOptions |= RE.MATCH_CASEINDEPENDENT;
}
if (RegexpUtil.hasFlag(options, MATCH_MULTILINE)) {
cOptions |= RE.MATCH_MULTILINE;
}
if (RegexpUtil.hasFlag(options, MATCH_SINGLELINE)) {
cOptions |= RE.MATCH_SINGLELINE;
}
return cOptions;
}
}
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