/*
* Copyright 2009 the original author or authors.
*
* Licensed 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.gradle.api.internal.file.pattern;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegExpPatternStep implements PatternStep {
private static final String ESCAPE_CHARS = "\\[]^-&.{}()$+|<=!";
private final Pattern pattern;
public RegExpPatternStep(String pattern, boolean caseSensitive) {
this.pattern = Pattern.compile(getRegExPattern(pattern), caseSensitive?0:Pattern.CASE_INSENSITIVE);
}
@Override
public String toString() {
return "{regexp: " + pattern + "}";
}
protected static String getRegExPattern(String pattern) {
StringBuilder result = new StringBuilder();
for (int i=0; i<pattern.length(); i++) {
char next = pattern.charAt(i);
if (next == '*') {
result.append(".*");
} else if (next == '?') {
result.append(".");
} else if (ESCAPE_CHARS.indexOf(next) >= 0) {
result.append('\\');
result.append(next);
} else {
result.append(next);
}
}
return result.toString();
}
public boolean matches(String testString) {
Matcher matcher = pattern.matcher(testString);
return matcher.matches();
}
}