org.gridkit.jvmtool.GlobHelper Maven / Gradle / Ivy
/**
* Copyright 2013 Alexey Ragozin
*
* 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.gridkit.jvmtool;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* @author Alexey Ragozin ([email protected])
*/
public class GlobHelper {
/**
* GLOB pattern supports *, ** and ? wild cards.
* Leading and trailing ** have special meaning, consecutive separator become optional.
*/
public static Pattern translate(String pattern, String separator) {
StringBuffer sb = new StringBuffer();
String es = escape(separator);
// special starter
Matcher ss = Pattern.compile("^([*][*][" + es + "]).*").matcher(pattern);
if (ss.matches()) {
pattern = pattern.substring(ss.group(1).length());
// make leading sep optional
sb.append("(.*[" + es + "])?");
}
// special trailer
Matcher st = Pattern.compile(".*([" + es + "][*][*])$").matcher(pattern);
boolean useSt = false;
if (st.matches()) {
pattern = pattern.substring(0, st.start(1));
useSt = true;
}
for(int i = 0; i != pattern.length(); ++i) {
char c = pattern.charAt(i);
if (c == '?') {
sb.append("[^" + es + "]");
}
else if (c == '*') {
if (i + 1 < pattern.length() && pattern.charAt(i+1) == '*') {
i++;
// **
sb.append(".*");
}
else {
sb.append("[^" + es + "]*");
}
}
else {
if (c == '$') {
sb.append("\\$");
}
else if (Character.isJavaIdentifierPart(c) || Character.isWhitespace(c)) {
sb.append(c);
}
else {
sb.append('\\').append(c);
}
}
}
if (useSt) {
sb.append("([" + es + "].*)?");
}
return Pattern.compile(sb.toString());
}
private static String escape(String separator) {
StringBuffer sb = new StringBuffer();
for(int i = 0; i != separator.length(); ++i) {
char c = separator.charAt(i);
if ("\\[]&-".indexOf(c) >= 0){
sb.append('\\').append(c);
}
else {
sb.append(c);
}
}
return sb.toString();
}
}