Review

6

/mubench/mubench.pipeline/../checkouts/closure/319/original-src/com/google/javascript/rhino/Context.java

getSourcePositionFromStack(int[])

class Context {
    static String getSourcePositionFromStack(int[] linep)
    {
        Context cx = getCurrentContext();
        if (cx == null)
            return null;
        /**
         * A bit of a hack, but the only way to get filename and line
         * number from an enclosing frame.
         */
        CharArrayWriter writer = new CharArrayWriter();
        RuntimeException re = new RuntimeException();
        re.printStackTrace(new PrintWriter(writer));
        String s = writer.toString();
        int open = -1;
        int close = -1;
        int colon = -1;
        for (int i=0; i < s.length(); i++) {
            char c = s.charAt(i);
            if (c == ':')
                colon = i;
            else if (c == '(')
                open = i;
            else if (c == ')')
                close = i;
            else if (c == '\n' && open != -1 && close != -1 && colon != -1 &&
                     open < colon && colon < close)
            {
                String fileStr = s.substring(open + 1, colon);
                if (!fileStr.endsWith(".java")) {
                    String lineStr = s.substring(colon + 1, close);
                    try {
                        linep[0] = Integer.parseInt(lineStr);
                        if (linep[0] < 0) {
                            linep[0] = 0;
                        }
                        return fileStr;
                    }
                    catch (NumberFormatException e) {
                        // fall through
                    }
                }
                open = close = colon = -1;
            }
        }

        return null;
    }

}