Brackets scriptlet to anonymize all the strings in a very large JS file, without changing its length or formatting

gistfile1.js

        function makeFiller(len) {
            var str = "";
            var i;
            for (i = 0; i < len; i++) {
                var mod = i % 10;
                if (mod) {
                    str += mod;
                } else {
                    mod = (i / 10) % 10;
                    str += mod;
                }
            }
            return str;
        }
        
        var currentEditor = EditorManager.getActiveEditor();
        var doc = currentEditor.document;
        var contents = doc.getText();
        
        var i = 0;

        function processCode() {
            for (; i < contents.length; i++) {
                var ch = contents[i];
                if (ch === '"' || ch === "'") {
                    i++; // eat the opening quote
                    return ch;
                }
            }
        }
        function processString(delim) {
            var stringStart = i;
            for (; i < contents.length; i++) {
                var ch = contents[i];
                if (ch === "\\") {
                    i++; // skip whatever's next
                } else if (ch === delim) {
                    // reached end of string literal: replace it with filler
                    var subst = makeFiller(i - stringStart);
                    contents = contents.substr(0, stringStart) + subst + contents.substr(i);
                    i++; // eat the closing quote
                    return;
                } else if (ch === "\n") {
                    throw new Error("Newline inside string literal!", i);
                }
            }
        }

        var stringDelim;
        while (i < contents.length) {
            if (stringDelim) {
                processString(stringDelim);
                stringDelim = null;
            } else {
                stringDelim = processCode();
            }
        }
        
        doc.setText(contents);