//package org.zkoss.maven.yuicompressor.util;
public class Comments {
//
// public static String readFile(String file) {
// try {
// Scanner scanner = new Scanner(new FileReader(new File(file)));
// StringBuffer sb = new StringBuffer();
// while (scanner.hasNextLine()) {
// sb.append(scanner.nextLine()+"\r\n");
//
// }
// return sb.toString();
// } catch (Exception e) {
// return "";
// }
// }
//
// public static void main(String[] args) {
//
// System.out.println(removeComment(readFile("skin.js")));
//
// }
public static String removeComment(String input) {
StringBuffer sb = new StringBuffer(input);
char NQ = ' ', quote = NQ;
int len = sb.length();
for (int j = 0, lineno = 1; j < len; j++) {
if (sb.charAt(j) == '\n')
++lineno;
if (quote != NQ) {
if (sb.charAt(j) == quote){
quote = NQ;
}else if (sb.charAt(j) == '\\') {
j++;
//fix for "123\\\r\n123"
if(sb.charAt(j)=='\r') j++;
// if(sb.charAt(j) == '\n') j++;
} else if (sb.charAt(j) == '\n') {
throw new IllegalStateException("Unterminated string at line " + lineno);
}
} else if (sb.charAt(j) == '/' && j + 1 < len && (sb.charAt(j + 1) == '*' || sb.charAt(j + 1) == '/')) {
int l = j;
boolean eol = sb.charAt(++j) == '/';
while (++j < len) {
if (sb.charAt(j) == '\n')
++lineno;
if (eol) {
if (sb.charAt(j) == '\n') {
sb.delete(l, sb.charAt(j - 1) == '\r' ? j - 1 : j);
len = sb.length();
j = l;
break;
}
} else if (sb.charAt(j) == '*' && j + 1 < len && sb.charAt(j + 1) == '/') {
sb.delete(l, j + 2);
len = sb.length();
j = l;
break;
}
}
} else if (sb.charAt(j) == '\'' || sb.charAt(j) == '"') {
quote = sb.charAt(j);
} else if (sb.charAt(j) == '/') { // regex
boolean regex = false;
for (int k = j;;) {
if (--k < 0) {
regex = true;
break;
}
char ck = sb.charAt(k);
if (!Character.isWhitespace(ck)) {
regex = ck == '(' || ck == ',' || ck == '=' || ck == ':' || ck == '?' || ck == '{' || ck == '['
|| ck == ';' || ck == '!' || ck == '&' || ck == '|' || ck == '^'
|| (ck == 'n' && k > 4 && "return".equals(sb.substring(k - 5, k + 1)))
|| (ck == 'e' && k > 2 && "case".equals(sb.substring(k - 3, k + 1)));
break;
}
}
if (regex) {
while (++j < len && sb.charAt(j) != '/') {
if (sb.charAt(j) == '\\')
j++;
else if (sb.charAt(j) == '\n') {
throw new IllegalStateException("Unterminated regex at line " + lineno);
}
}
}
}
}
return sb.toString();
}
}