zkoss/zk

String[] args = this.interpreter.get("bsh.args");
if (args == null || args.length != 2) {
    System.err.println("The source and destination files must be specified");
    System.exit(-1);
}

import java.io.*;

InputStream is = new FileInputStream(args[0]);
Reader in = new BufferedReader(new InputStreamReader(is, "UTF-8"));
StringWriter sw = new StringWriter();

char[] buf = new char[1024];
int len;
while ((len = in.read(buf, 0, buf.length)) >= 0)
    sw.write(buf, 0, len);
buf = null;
in.close();
is.close();

StringBuffer sb = sw.getBuffer();
char NQ = ' ', quote = NQ;
boolean reqex = false;
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++;
        else if (sb.charAt(j) == '\n') {
            System.err.println("Unterminated string at line "+lineno);
            System.exit(-1);
        }
    } 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') {
                    System.err.println("Unterminated regex at line "+lineno);
                    System.exit(-1);
                }
            }
        }
    }
}

OutputStream os = new FileOutputStream(args[1]);
Writer out = new OutputStreamWriter(os, "UTF-8");
out.write(sb.toString());
out.close();
os.close();