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package com.sun.enterprise.util;
/** Provides some regex utilities.
* @author Kedar Mhaswade (km@dev.java.net)
* @since GF 3.1
*/
public class RegexUtil {
/**
* Convert a shell style glob regular expression to a
* Java regular expression.
* Code from: http://stackoverflow.com/questions/1247772
*/
public static String globToRegex(String line) {
line = line.trim();
int strLen = line.length();
StringBuilder sb = new StringBuilder(strLen);
boolean escaping = false;
int inCurlies = 0;
for (char currentChar : line.toCharArray()) {
switch (currentChar) {
case '*':
if (escaping)
sb.append("\\*");
else
sb.append(".*");
escaping = false;
break;
case '?':
if (escaping)
sb.append("\\?");
else
sb.append('.');
escaping = false;
break;
case '.':
case '(':
case ')':
case '+':
case '|':
case '^':
case '$':
case '@':
case '%':
sb.append('\\');
sb.append(currentChar);
escaping = false;
break;
case '\\':
if (escaping) {
sb.append("\\\\");
escaping = false;
} else
escaping = true;
break;
case '{':
if (escaping) {
sb.append("\\{");
} else {
sb.append('(');
inCurlies++;
}
escaping = false;
break;
case '}':
if (inCurlies > 0 && !escaping) {
sb.append(')');
inCurlies--;
} else if (escaping)
sb.append("\\}");
else
sb.append("}");
escaping = false;
break;
case ',':
if (inCurlies > 0 && !escaping)
sb.append('|');
else if (escaping)
sb.append("\\,");
else
sb.append(",");
break;
default:
escaping = false;
sb.append(currentChar);
}
}
return sb.toString();
}
}