beautify.js

/*jslint onevar: false, plusplus: false */
/*

 JS Beautifier
---------------


  Written by Einar Lielmanis, <einar@jsbeautifier.org>
      http://jsbeautifier.org/

  Originally converted to javascript by Vital, <vital76@gmail.com>

  You are free to use this in any way you want, in case you find this useful or working for you.

  Usage:
    js_beautify(js_source_text);
    js_beautify(js_source_text, options);

  The options are:
    indent_size (default 4)          — indentation size,
    indent_char (default space)      — character to indent with,
    preserve_newlines (default true) — whether existing line breaks should be preserved,
    indent_level (default 0)         — initial indentation level, you probably won't need this ever,

    space_after_anon_function (default false) — if true, then space is added between "function ()"
            (jslint is happy about this); if false, then the common "function()" output is used.
    braces_on_own_line (default false) - ANSI / Allman brace style, each opening/closing brace gets its own line.

    e.g

    js_beautify(js_source_text, {indent_size: 1, indent_char: '\t'});


*/



function js_beautify(js_source_text, options) {

    var input, output, token_text, last_type, last_text, last_last_text, last_word, flags, flag_store, indent_string;
    var whitespace, wordchar, punct, parser_pos, line_starters, digits;
    var prefix, token_type, do_block_just_closed;
    var wanted_newline, just_added_newline, n_newlines;


    // Some interpreters have unexpected results with foo = baz || bar;
    options = options ? options : {};
    var opt_braces_on_own_line = options.braces_on_own_line ? options.braces_on_own_line : false;
    var opt_indent_size = options.indent_size ? options.indent_size : 4;
    var opt_indent_char = options.indent_char ? options.indent_char : ' ';
    var opt_preserve_newlines = typeof options.preserve_newlines === 'undefined' ? true : options.preserve_newlines;
    var opt_indent_level = options.indent_level ? options.indent_level : 0; // starting indentation
    var opt_space_after_anon_function = options.space_after_anon_function === 'undefined' ? false : options.space_after_anon_function;
    var opt_keep_array_indentation = typeof options.keep_array_indentation === 'undefined' ? false : options.keep_array_indentation;

    just_added_newline = false;

    // cache the source's length.
    var input_length = js_source_text.length;

    function trim_output() {
        while (output.length && (output[output.length - 1] === ' ' || output[output.length - 1] === indent_string)) {
            output.pop();
        }
    }

    function is_array(mode) {
        return mode === '[EXPRESSION]' || mode === '[INDENTED-EXPRESSION]';
    }

    function trim(s) {
        return s.replace(/^\s\s*|\s\s*$/, '');
    }

    function print_newline(ignore_repeated) {

        flags.eat_next_space = false;
        if (opt_keep_array_indentation && is_array(flags.mode)) {
            return;
        }

        ignore_repeated = typeof ignore_repeated === 'undefined' ? true : ignore_repeated;

        flags.if_line = false;
        trim_output();

        if (!output.length) {
            return; // no newline on start of file
        }

        if (output[output.length - 1] !== "\n" || !ignore_repeated) {
            just_added_newline = true;
            output.push("\n");
        }
        for (var i = 0; i < flags.indentation_level; i += 1) {
            output.push(indent_string);
        }
        if (flags.var_line && flags.var_line_reindented) {
            if (opt_indent_char === ' ') {
                output.push('    '); // var_line always pushes 4 spaces, so that the variables would be one under another
            } else {
                output.push(indent_string); // skip space-stuffing, if indenting with a tab
            }
        }
    }



    function print_single_space() {
        if (flags.eat_next_space) {
            flags.eat_next_space = false;
            return;
        }
        var last_output = ' ';
        if (output.length) {
            last_output = output[output.length - 1];
        }
        if (last_output !== ' ' && last_output !== '\n' && last_output !== indent_string) { // prevent occassional duplicate space
            output.push(' ');
        }
    }


    function print_token() {
        just_added_newline = false;
        flags.eat_next_space = false;
        output.push(token_text);
    }

    function indent() {
        flags.indentation_level += 1;
    }


    function remove_indent() {
        if (output.length && output[output.length - 1] === indent_string) {
            output.pop();
        }
    }

    function set_mode(mode) {
        if (flags) {
            flag_store.push(flags);
        }
        flags = {
            previous_mode: flags ? flags.mode : 'BLOCK',
            mode: mode,
            var_line: false,
            var_line_tainted: false,
            var_line_reindented: false,
            in_html_comment: false,
            if_line: false,
            in_case: false,
            eat_next_space: false,
            indentation_baseline: -1,
            indentation_level: (flags ? flags.indentation_level + ((flags.var_line && flags.var_line_reindented) ? 1 : 0) : opt_indent_level)
        };
    }

    function is_array(mode) {
        return mode === '[EXPRESSION]' || mode === '[INDENTED-EXPRESSION]';
    }

    function is_expression(mode) {
        return mode === '[EXPRESSION]' || mode === '[INDENTED-EXPRESSION]' || mode === '(EXPRESSION)';
    }

    function restore_mode() {
        do_block_just_closed = flags.mode === 'DO_BLOCK';
        if (flag_store.length > 0) {
            flags = flag_store.pop();
        }
    }


    function in_array(what, arr) {
        for (var i = 0; i < arr.length; i += 1) {
            if (arr[i] === what) {
                return true;
            }
        }
        return false;
    }

    // Walk backwards from the colon to find a '?' (colon is part of a ternary op)
    // or a '{' (colon is part of a class literal).  Along the way, keep track of
    // the blocks and expressions we pass so we only trigger on those chars in our
    // own level, and keep track of the colons so we only trigger on the matching '?'.


    function is_ternary_op() {
        var level = 0,
            colon_count = 0;
        for (var i = output.length - 1; i >= 0; i--) {
            switch (output[i]) {
            case ':':
                if (level === 0) {
                    colon_count++;
                }
                break;
            case '?':
                if (level === 0) {
                    if (colon_count === 0) {
                        return true;
                    } else {
                        colon_count--;
                    }
                }
                break;
            case '{':
                if (level === 0) {
                    return false;
                }
                level--;
                break;
            case '(':
            case '[':
                level--;
                break;
            case ')':
            case ']':
            case '}':
                level++;
                break;
            }
        }
    }

    function get_next_token() {
        n_newlines = 0;

        if (parser_pos >= input_length) {
            return ['', 'TK_EOF'];
        }

        wanted_newline = false;

        var c = input.charAt(parser_pos);
        parser_pos += 1;


        var keep_whitespace = opt_keep_array_indentation && is_array(flags.mode);

        if (keep_whitespace) {

            //
            // slight mess to allow nice preservation of array indentation and reindent that correctly
            // first time when we get to the arrays:
            // var a = [
            // ....'something'
            // we make note of whitespace_count = 4 into flags.indentation_baseline
            // so we know that 4 whitespaces in original source match indent_level of reindented source
            //
            // and afterwards, when we get to
            //    'something,
            // .......'something else'
            // we know that this should be indented to indent_level + (7 - indentation_baseline) spaces
            //
            var whitespace_count = 0;

            while (in_array(c, whitespace)) {

                if (c === "\n") {
                    trim_output();
                    output.push("\n");
                    just_added_newline = true;
                    whitespace_count = 0;
                } else {
                    if (c === '\t') {
                        whitespace_count += 4;
                    } else {
                        whitespace_count += 1;
                    }
                }

                if (parser_pos >= input_length) {
                    return ['', 'TK_EOF'];
                }

                c = input.charAt(parser_pos);
                parser_pos += 1;

            }
            if (flags.indentation_baseline === -1) {
                flags.indentation_baseline = whitespace_count;
            }

            if (just_added_newline) {
                var i;
                for (i = 0; i < flags.indentation_level + 1; i += 1) {
                    output.push(indent_string);
                }
                if (flags.indentation_baseline !== -1) {
                    for (i = 0; i < whitespace_count - flags.indentation_baseline; i++) {
                        output.push(' ');
                    }
                }
            }

        } else {
            while (in_array(c, whitespace)) {

                if (c === "\n") {
                    n_newlines += 1;
                }


                if (parser_pos >= input_length) {
                    return ['', 'TK_EOF'];
                }

                c = input.charAt(parser_pos);
                parser_pos += 1;

            }

            if (opt_preserve_newlines) {
                if (n_newlines > 1) {
                    for (i = 0; i < n_newlines; i += 1) {
                        print_newline(i === 0);
                        just_added_newline = true;
                    }
                }
            }
            wanted_newline = n_newlines > 0;
        }


        if (in_array(c, wordchar)) {
            if (parser_pos < input_length) {
                while (in_array(input.charAt(parser_pos), wordchar)) {
                    c += input.charAt(parser_pos);
                    parser_pos += 1;
                    if (parser_pos === input_length) {
                        break;
                    }
                }
            }

            // small and surprisingly unugly hack for 1E-10 representation
            if (parser_pos !== input_length && c.match(/^[0-9]+[Ee]$/) && (input.charAt(parser_pos) === '-' || input.charAt(parser_pos) === '+')) {

                var sign = input.charAt(parser_pos);
                parser_pos += 1;

                var t = get_next_token(parser_pos);
                c += sign + t[0];
                return [c, 'TK_WORD'];
            }

            if (c === 'in') { // hack for 'in' operator
                return [c, 'TK_OPERATOR'];
            }
            if (wanted_newline && last_type !== 'TK_OPERATOR' && !flags.if_line && (opt_preserve_newlines || last_text !== 'var')) {
                print_newline();
            }
            return [c, 'TK_WORD'];
        }

        if (c === '(' || c === '[') {
            return [c, 'TK_START_EXPR'];
        }

        if (c === ')' || c === ']') {
            return [c, 'TK_END_EXPR'];
        }

        if (c === '{') {
            return [c, 'TK_START_BLOCK'];
        }

        if (c === '}') {
            return [c, 'TK_END_BLOCK'];
        }

        if (c === ';') {
            return [c, 'TK_SEMICOLON'];
        }

        if (c === '/') {
            var comment = '';
            // peek for comment /* ... */
            var inline_comment = true;
            if (input.charAt(parser_pos) === '*') {
                parser_pos += 1;
                if (parser_pos < input_length) {
                    while (! (input.charAt(parser_pos) === '*' && input.charAt(parser_pos + 1) && input.charAt(parser_pos + 1) === '/') && parser_pos < input_length) {
                        c = input.charAt(parser_pos);
                        comment += c;
                        if (c === '\x0d' || c === '\x0a') {
                            inline_comment = false;
                        }
                        parser_pos += 1;
                        if (parser_pos >= input_length) {
                            break;
                        }
                    }
                }
                parser_pos += 2;
                if (inline_comment) {
                    return ['/*' + comment + '*/', 'TK_INLINE_COMMENT'];
                } else {
                    return ['/*' + comment + '*/', 'TK_BLOCK_COMMENT'];
                }
            }
            // peek for comment // ...
            if (input.charAt(parser_pos) === '/') {
                comment = c;
                while (input.charAt(parser_pos) !== "\x0d" && input.charAt(parser_pos) !== "\x0a") {
                    comment += input.charAt(parser_pos);
                    parser_pos += 1;
                    if (parser_pos >= input_length) {
                        break;
                    }
                }
                parser_pos += 1;
                if (wanted_newline) {
                    print_newline();
                }
                return [comment, 'TK_COMMENT'];
            }

        }

        if (c === "'" || // string
        c === '"' || // string
        (c === '/' && ((last_type === 'TK_WORD' && in_array(last_text, ['return', 'do'])) || (last_type === 'TK_START_EXPR' || last_type === 'TK_START_BLOCK' || last_type === 'TK_END_BLOCK' || last_type === 'TK_OPERATOR' || last_type === 'TK_EQUALS' || last_type === 'TK_EOF' || last_type === 'TK_SEMICOLON')))) { // regexp
            var sep = c;
            var esc = false;
            var resulting_string = c;

            if (parser_pos < input_length) {
                if (sep === '/') {
                    //
                    // handle regexp separately...
                    //
                    var in_char_class = false;
                    while (esc || in_char_class || input.charAt(parser_pos) !== sep) {
                        resulting_string += input.charAt(parser_pos);
                        if (!esc) {
                            esc = input.charAt(parser_pos) === '\\';
                            if (input.charAt(parser_pos) === '[') {
                                in_char_class = true;
                            } else if (input.charAt(parser_pos) === ']') {
                                in_char_class = false;
                            }
                        } else {
                            esc = false;
                        }
                        parser_pos += 1;
                        if (parser_pos >= input_length) {
                            // incomplete string/rexp when end-of-file reached.
                            // bail out with what had been received so far.
                            return [resulting_string, 'TK_STRING'];
                        }
                    }

                } else {
                    //
                    // and handle string also separately
                    //
                    while (esc || input.charAt(parser_pos) !== sep) {
                        resulting_string += input.charAt(parser_pos);
                        if (!esc) {
                            esc = input.charAt(parser_pos) === '\\';
                        } else {
                            esc = false;
                        }
                        parser_pos += 1;
                        if (parser_pos >= input_length) {
                            // incomplete string/rexp when end-of-file reached.
                            // bail out with what had been received so far.
                            return [resulting_string, 'TK_STRING'];
                        }
                    }
                }



            }

            parser_pos += 1;

            resulting_string += sep;

            if (sep === '/') {
                // regexps may have modifiers /regexp/MOD , so fetch those, too
                while (parser_pos < input_length && in_array(input.charAt(parser_pos), wordchar)) {
                    resulting_string += input.charAt(parser_pos);
                    parser_pos += 1;
                }
            }
            return [resulting_string, 'TK_STRING'];
        }

        if (c === '#') {
            // Spidermonkey-specific sharp variables for circular references
            // https://developer.mozilla.org/En/Sharp_variables_in_JavaScript
            // http://mxr.mozilla.org/mozilla-central/source/js/src/jsscan.cpp around line 1935
            var sharp = '#';
            if (parser_pos < input_length && in_array(input.charAt(parser_pos), digits)) {
                do {
                    c = input.charAt(parser_pos);
                    sharp += c;
                    parser_pos += 1;
                } while (parser_pos < input_length && c !== '#' && c !== '=');
                if (c === '#') {
                    //
                } else if (input.charAt(parser_pos) === '[' && input.charAt(parser_pos + 1) === ']') {
                    sharp += '[]';
                    parser_pos += 2;
                } else if (input.charAt(parser_pos) === '{' && input.charAt(parser_pos + 1) === '}') {
                    sharp += '{}';
                    parser_pos += 2;
                }
                return [sharp, 'TK_WORD'];
            }
        }

        if (c === '<' && input.substring(parser_pos - 1, parser_pos + 3) === '<!--') {
            parser_pos += 3;
            flags.in_html_comment = true;
            return ['<!--', 'TK_COMMENT'];
        }

        if (c === '-' && flags.in_html_comment && input.substring(parser_pos - 1, parser_pos + 2) === '-->') {
            flags.in_html_comment = false;
            parser_pos += 2;
            if (wanted_newline) {
                print_newline();
            }
            return ['-->', 'TK_COMMENT'];
        }

        if (in_array(c, punct)) {
            while (parser_pos < input_length && in_array(c + input.charAt(parser_pos), punct)) {
                c += input.charAt(parser_pos);
                parser_pos += 1;
                if (parser_pos >= input_length) {
                    break;
                }
            }

            if (c === '=') {
                return [c, 'TK_EQUALS'];
            } else {
                return [c, 'TK_OPERATOR'];
            }
        }

        return [c, 'TK_UNKNOWN'];
    }

    //----------------------------------
    indent_string = '';
    while (opt_indent_size > 0) {
        indent_string += opt_indent_char;
        opt_indent_size -= 1;
    }

    input = js_source_text;

    last_word = ''; // last 'TK_WORD' passed
    last_type = 'TK_START_EXPR'; // last token type
    last_text = ''; // last token text
    last_last_text = ''; // pre-last token text
    output = [];

    do_block_just_closed = false;

    whitespace = "\n\r\t ".split('');
    wordchar = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_$'.split('');
    digits = '0123456789'.split('');

    punct = '+ - * / % & ++ -- = += -= *= /= %= == === != !== > < >= <= >> << >>> >>>= >>= <<= && &= | || ! !! , : ? ^ ^= |= ::'.split(' ');

    // words which should always start on new line.
    line_starters = 'continue,try,throw,return,var,if,switch,case,default,for,while,break,function'.split(',');

    // states showing if we are currently in expression (i.e. "if" case) - 'EXPRESSION', or in usual block (like, procedure), 'BLOCK'.
    // some formatting depends on that.
    flag_store = [];
    set_mode('BLOCK');

    parser_pos = 0;
    while (true) {
        var t = get_next_token(parser_pos);
        token_text = t[0];
        token_type = t[1];
        if (token_type === 'TK_EOF') {
            break;
        }

        switch (token_type) {

        case 'TK_START_EXPR':

            if (token_text === '[') {

                if (last_type === 'TK_WORD' || last_text === ')') {
                    // this is array index specifier, break immediately
                    // a[x], fn()[x]
                    if (in_array(last_text, line_starters)) {
                        print_single_space();
                    }
                    set_mode('(EXPRESSION)');
                    print_token();
                    break;
                }

                if (flags.mode === '[EXPRESSION]' || flags.mode === '[INDENTED-EXPRESSION]') {
                    if (last_last_text === ']' && last_text === ',') {
                        // ], [ goes to new line
                        if (flags.mode === '[EXPRESSION]') {
                            flags.mode = '[INDENTED-EXPRESSION]';
                            if (!opt_keep_array_indentation) {
                                indent();
                            }
                        }
                        set_mode('[EXPRESSION]');
                        if (!opt_keep_array_indentation) {
                            print_newline();
                        }
                    } else if (last_text === '[') {
                        if (flags.mode === '[EXPRESSION]') {
                            flags.mode = '[INDENTED-EXPRESSION]';
                            if (!opt_keep_array_indentation) {
                                indent();
                            }
                        }
                        set_mode('[EXPRESSION]');

                        if (!opt_keep_array_indentation) {
                            print_newline();
                        }
                    } else {
                        set_mode('[EXPRESSION]');
                    }
                } else {
                    set_mode('[EXPRESSION]');
                }



            } else {
                set_mode('(EXPRESSION)');
            }

            if (last_text === ';' || last_type === 'TK_START_BLOCK') {
                print_newline();
            } else if (last_type === 'TK_END_EXPR' || last_type === 'TK_START_EXPR' || last_type === 'TK_END_BLOCK' || last_text === '.') {
                // do nothing on (( and )( and ][ and ]( and .(
            } else if (last_type !== 'TK_WORD' && last_type !== 'TK_OPERATOR') {
                print_single_space();
            } else if (last_word === 'function') {
                // function() vs function ()
                if (opt_space_after_anon_function) {
                    print_single_space();
                }
            } else if (in_array(last_text, line_starters) || last_text === 'catch') {
                print_single_space();
            }
            print_token();

            break;

        case 'TK_END_EXPR':
            if (token_text === ']') {
                if (opt_keep_array_indentation) {
                    if (last_text === '}') {
                        // trim_output();
                        // print_newline(true);
                        remove_indent();
                        print_token();
                        restore_mode();
                        break;
                    }
                } else {
                    if (flags.mode === '[INDENTED-EXPRESSION]') {
                        if (last_text === ']') {
                            restore_mode();
                            print_newline();
                            print_token();
                            break;
                        }
                    }
                }
            }
            restore_mode();
            print_token();
            break;

        case 'TK_START_BLOCK':

            if (last_word === 'do') {
                set_mode('DO_BLOCK');
            } else {
                set_mode('BLOCK');
            }
            if (opt_braces_on_own_line) {
                if (last_type !== 'TK_OPERATOR') {
                    if (last_text == 'return') {
                        print_single_space();
                    } else {
                        print_newline(true);
                    }
                }
                print_token();
                indent();
            } else {
                if (last_type !== 'TK_OPERATOR' && last_type !== 'TK_START_EXPR') {
                    if (last_type === 'TK_START_BLOCK') {
                        print_newline();
                    } else {
                        print_single_space();
                    }
                } else {
                    // if TK_OPERATOR or TK_START_EXPR
                    if (is_array(flags.previous_mode) && last_text === ',') {
                        print_newline(); // [a, b, c, {
                    }
                }
                indent();
                print_token();
            }

            break;

        case 'TK_END_BLOCK':
            restore_mode();
            if (opt_braces_on_own_line) {
                print_newline();
                print_token();
            } else {
                if (last_type === 'TK_START_BLOCK') {
                    // nothing
                    if (just_added_newline) {
                        remove_indent();
                    } else {
                        // {}
                        trim_output();
                    }
                } else {
                    print_newline();
                }
                print_token();
            }
            break;

        case 'TK_WORD':

            // no, it's not you. even I have problems understanding how this works
            // and what does what.
            if (do_block_just_closed) {
                // do {} ## while ()
                print_single_space();
                print_token();
                print_single_space();
                do_block_just_closed = false;
                break;
            }

            if (token_text === 'function') {
                if ((just_added_newline || last_text === ';') && last_text !== '{') {
                    // make sure there is a nice clean space of at least one blank line
                    // before a new function definition
                    n_newlines = just_added_newline ? n_newlines : 0;

                    for (var i = 0; i < 2 - n_newlines; i++) {
                        print_newline(false);
                    }

                }
            }

            if (token_text === 'case' || token_text === 'default') {
                if (last_text === ':') {
                    // switch cases following one another
                    remove_indent();
                } else {
                    // case statement starts in the same line where switch
                    flags.indentation_level--;
                    print_newline();
                    flags.indentation_level++;
                }
                print_token();
                flags.in_case = true;
                break;
            }

            prefix = 'NONE';

            if (last_type === 'TK_END_BLOCK') {
                if (!in_array(token_text.toLowerCase(), ['else', 'catch', 'finally'])) {
                    prefix = 'NEWLINE';
                } else {
                    if (opt_braces_on_own_line) {
                        prefix = 'NEWLINE';
                    } else {
                        prefix = 'SPACE';
                        print_single_space();
                    }
                }
            } else if (last_type === 'TK_SEMICOLON' && (flags.mode === 'BLOCK' || flags.mode === 'DO_BLOCK')) {
                prefix = 'NEWLINE';
            } else if (last_type === 'TK_SEMICOLON' && is_expression(flags.mode)) {
                prefix = 'SPACE';
            } else if (last_type === 'TK_STRING') {
                prefix = 'NEWLINE';
            } else if (last_type === 'TK_WORD') {
                prefix = 'SPACE';
            } else if (last_type === 'TK_START_BLOCK') {
                prefix = 'NEWLINE';
            } else if (last_type === 'TK_END_EXPR') {
                print_single_space();
                prefix = 'NEWLINE';
            }

            if (last_type !== 'TK_END_BLOCK' && in_array(token_text.toLowerCase(), ['else', 'catch', 'finally'])) {
                print_newline();
            } else if (in_array(token_text, line_starters) || prefix === 'NEWLINE') {
                if (last_text === 'else') {
                    // no need to force newline on else break
                    print_single_space();
                } else if ((last_type === 'TK_START_EXPR' || last_text === '=' || last_text === ',') && token_text === 'function') {
                    // no need to force newline on 'function': (function
                    // DONOTHING
                } else if (last_text === 'return' || last_text === 'throw') {
                    // no newline between 'return nnn'
                    print_single_space();
                } else if (last_type !== 'TK_END_EXPR') {
                    if ((last_type !== 'TK_START_EXPR' || token_text !== 'var') && last_text !== ':') {
                        // no need to force newline on 'var': for (var x = 0...)
                        if (token_text === 'if' && last_word === 'else' && last_text !== '{') {
                            // no newline for } else if {
                            print_single_space();
                        } else {
                            print_newline();
                        }
                    }
                } else {
                    if (in_array(token_text, line_starters) && last_text !== ')') {
                        print_newline();
                    }
                }
            } else if (is_array(flags.mode) && last_text === ',' && last_last_text === '}') {
                print_newline(); // }, in lists get a newline treatment
            } else if (prefix === 'SPACE') {
                print_single_space();
            }
            print_token();
            last_word = token_text;

            if (token_text === 'var') {
                flags.var_line = true;
                flags.var_line_reindented = false;
                flags.var_line_tainted = false;
            }

            if (token_text === 'if' || token_text === 'else') {
                flags.if_line = true;
            }

            break;

        case 'TK_SEMICOLON':

            print_token();
            flags.var_line = false;
            flags.var_line_reindented = false;
            break;

        case 'TK_STRING':

            if (last_type === 'TK_START_BLOCK' || last_type === 'TK_END_BLOCK' || last_type === 'TK_SEMICOLON') {
                print_newline();
            } else if (last_type === 'TK_WORD') {
                print_single_space();
            }
            print_token();
            break;

        case 'TK_EQUALS':
            if (flags.var_line) {
                // just got an '=' in a var-line, different formatting/line-breaking, etc will now be done
                flags.var_line_tainted = true;
            }
            print_single_space();
            print_token();
            print_single_space();
            break;

        case 'TK_OPERATOR':

            var space_before = true;
            var space_after = true;

            if (flags.var_line && token_text === ',' && (is_expression(flags.mode))) {
                // do not break on comma, for(var a = 1, b = 2)
                flags.var_line_tainted = false;
            }

            if (flags.var_line) {
                if (token_text === ',') {
                    if (flags.var_line_tainted) {
                        print_token();
                        flags.var_line_reindented = true;
                        flags.var_line_tainted = false;
                        print_newline();
                        break;
                    } else {
                        flags.var_line_tainted = false;
                    }
                // } else if (token_text === ':') {
                    // hmm, when does this happen? tests don't catch this
                    // flags.var_line = false;
                }
            }

            if (last_text === 'return' || last_text === 'throw') {
                // "return" had a special handling in TK_WORD. Now we need to return the favor
                print_single_space();
                print_token();
                break;
            }

            if (token_text === ':' && flags.in_case) {
                print_token(); // colon really asks for separate treatment
                print_newline();
                flags.in_case = false;
                break;
            }

            if (token_text === '::') {
                // no spaces around exotic namespacing syntax operator
                print_token();
                break;
            }

            if (token_text === ',') {
                if (flags.var_line) {
                    if (flags.var_line_tainted) {
                        print_token();
                        print_newline();
                        flags.var_line_tainted = false;
                    } else {
                        print_token();
                        print_single_space();
                    }
                } else if (last_type === 'TK_END_BLOCK' && flags.mode !== "(EXPRESSION)") {
                    print_token();
                    if (flags.mode === 'OBJECT' && last_text === '}') {
                        print_newline();
                    } else {
                        print_single_space();
                    }
                } else {
                    if (flags.mode === 'OBJECT') {
                        print_token();
                        print_newline();
                    } else {
                        // EXPR or DO_BLOCK
                        print_token();
                        print_single_space();
                    }
                }
                break;
            // } else if (in_array(token_text, ['--', '++', '!']) || (in_array(token_text, ['-', '+']) && (in_array(last_type, ['TK_START_BLOCK', 'TK_START_EXPR', 'TK_EQUALS']) || in_array(last_text, line_starters) || in_array(last_text, ['==', '!=', '+=', '-=', '*=', '/=', '+', '-'])))) {
            } else if (in_array(token_text, ['--', '++', '!']) || (in_array(token_text, ['-', '+']) && (in_array(last_type, ['TK_START_BLOCK', 'TK_START_EXPR', 'TK_EQUALS', 'TK_OPERATOR']) || in_array(last_text, line_starters)))) {
                // unary operators (and binary +/- pretending to be unary) special cases

                space_before = false;
                space_after = false;

                if (last_text === ';' && is_expression(flags.mode)) {
                    // for (;; ++i)
                    //        ^^^
                    space_before = true;
                }
                if (last_type === 'TK_WORD' && in_array(last_text, line_starters)) {
                    space_before = true;
                }

                if (flags.mode === 'BLOCK' && (last_text === '{' || last_text === ';')) {
                    // { foo; --i }
                    // foo(); --bar;
                    print_newline();
                }
            } else if (token_text === '.') {
                // decimal digits or object.property
                space_before = false;

            } else if (token_text === ':') {
                if (!is_ternary_op()) {
                    flags.mode = 'OBJECT';
                    space_before = false;
                }
            }
            if (space_before) {
                print_single_space();
            }

            print_token();

            if (space_after) {
                print_single_space();
            }

            if (token_text === '!') {
                // flags.eat_next_space = true;
            }

            break;

        case 'TK_BLOCK_COMMENT':

            var lines = token_text.split(/\x0a|\x0d\x0a/);

            if (/^\/\*\*/.test(token_text)) {
                // javadoc: reformat and reindent
                print_newline();
                output.push(lines[0]);
                for (i = 1; i < lines.length; i++) {
                    print_newline();
                    output.push(' ');
                    output.push(trim(lines[i]));
                }

            } else {
                // simple block comment: leave intact
                if (lines.length > 1) {
                    // multiline comment block starts with a new line
                    print_newline();
                } else {
                    // single-line /* comment */ stays where it is
                    print_single_space();
                }
                for (i = 0; i < lines.length; i++) {
                    if (i > 0) {
                        output.push(' ');
                    }
                    output.push(trim(lines[i]));
                    print_newline();
                }

            }
            print_newline();
            break;

        case 'TK_INLINE_COMMENT':

            print_single_space();
            print_token();
            if (is_expression(flags.mode)) {
                print_single_space();
            } else {
                print_newline();
            }
            break;

        case 'TK_COMMENT':

            // print_newline();
            if (wanted_newline) {
                print_newline();
            } else {
                print_single_space();
            }
            print_token();
            print_newline();
            break;

        case 'TK_UNKNOWN':
            print_token();
            break;
        }

        last_last_text = last_text;
        last_type = token_type;
        last_text = token_text;
    }

    return output.join('').replace(/[\n ]+$/, '');

}

// Add support for CommonJS. Just put this file somewhere on your require.paths
// and you will be able to `var js_beautify = require("beautify").js_beautify`.
if (typeof exports !== "undefined")
    exports.js_beautify = js_beautify;