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Ant example source code file (JakartaRegexpRegexp.java)

This example Ant source code file (JakartaRegexpRegexp.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Ant tags/keywords

buildexception, jakartaregexpmatcher, jakartaregexpmatcher, jakartaregexpregexp, jakartaregexpregexp, re, regexp, replace_all, string, string, stringbuffer, stringbuffer, util, vector

The JakartaRegexpRegexp.java source code

/*
 *  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.tools.ant.BuildException;

/***
 * Regular expression implementation using the Jakarta Regexp package
 */
public class JakartaRegexpRegexp extends JakartaRegexpMatcher
    implements Regexp {

    /** Constructor for JakartaRegexpRegexp */
    public JakartaRegexpRegexp() {
        super();
    }

    /**
     * Convert ant regexp substitution option to apache regex options.
     *
     * @param options the ant regexp options
     * @return the apache regex substition options
     */
    protected int getSubsOptions(int options) {
        int subsOptions = RE.REPLACE_FIRSTONLY;
        if (RegexpUtil.hasFlag(options, REPLACE_ALL)) {
            subsOptions = RE.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 {
        Vector v = getGroups(input, options);

        // replace \1 with the corresponding group
        StringBuffer result = new StringBuffer();
        for (int i = 0; i < argument.length(); i++) {
            char c = argument.charAt(i);
            if (c == '\\') {
                if (++i < argument.length()) {
                    c = argument.charAt(i);
                    int value = Character.digit(c, 10);
                    if (value > -1) {
                        result.append((String) v.elementAt(value));
                    } else {
                        result.append(c);
                    }
                } else {
                    // XXX - should throw an exception instead?
                    result.append('\\');
                }
            } else {
                result.append(c);
            }
        }
        argument = result.toString();

        RE reg = getCompiledPattern(options);
        int sOptions = getSubsOptions(options);
        return reg.subst(input, argument, sOptions);
    }
}

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