/*jshint curly:true, eqeqeq:true, laxbreak:true, noempty:false */
/*
 The MIT License (MIT)
 Copyright (c) 2007-2017 Einar Lielmanis, Liam Newman, and contributors.
 Permission is hereby granted, free of charge, to any person
 obtaining a copy of this software and associated documentation files
 (the "Software"), to deal in the Software without restriction,
 including without limitation the rights to use, copy, modify, merge,
 publish, distribute, sublicense, and/or sell copies of the Software,
 and to permit persons to whom the Software is furnished to do so,
 subject to the following conditions:
 The above copyright notice and this permission notice shall be
 included in all copies or substantial portions of the Software.
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 JS Beautifier
 ---------------
 Written by Einar Lielmanis, <einar@jsbeautifier.org>
 http://jsbeautifier.org/
 Originally converted to javascript by Vital, <vital76@gmail.com>
 "End braces on own line" added by Chris J. Shull, <chrisjshull@gmail.com>
 Parsing improvements for brace-less statements by Liam Newman <bitwiseman@gmail.com>
 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,
 max_preserve_newlines (default unlimited) - maximum number of line breaks to be preserved in one chunk,
 jslint_happy (default false) - if true, then jslint-stricter mode is enforced.
 jslint_happy        !jslint_happy
 ---------------------------------
 function ()         function()
 switch () {         switch() {
 case 1:               case 1:
 break;                break;
 }                   }
 space_after_anon_function (default false) - should the space before an anonymous function's parens be added, "function()" vs "function ()",
 NOTE: This option is overriden by jslint_happy (i.e. if jslint_happy is true, space_after_anon_function is true by design)
 brace_style (default "collapse") - "collapse" | "expand" | "end-expand" | "none" | any of the former + ",preserve-inline"
 put braces on the same line as control statements (default), or put braces on own line (Allman / ANSI style), or just put end braces on own line, or attempt to keep them where they are.
 preserve-inline will try to preserve inline blocks of curly braces
 space_before_conditional (default true) - should the space before conditional statement be added, "if(true)" vs "if (true)",
 unescape_strings (default false) - should printable characters in strings encoded in \xNN notation be unescaped, "example" vs "\x65\x78\x61\x6d\x70\x6c\x65"
 wrap_line_length (default unlimited) - lines should wrap at next opportunity after this number of characters.
 NOTE: This is not a hard limit. Lines will continue until a point where a newline would
 be preserved if it were present.
 end_with_newline (default false)  - end output with a newline
 e.g
 js_beautify(js_source_text, {
 'indent_size': 1,
 'indent_char': '\t'
 });
 */

// Object.values polyfill found here:
// http://tokenposts.blogspot.com.au/2012/04/javascript-objectkeys-browser.html
if (!Object.values) {
    Object.values = function(o) {
        if (o !== Object(o)) {
            throw new TypeError('Object.values called on a non-object');
        }
        var k = [],
            p;
        for (p in o) {
            if (Object.prototype.hasOwnProperty.call(o, p)) {
                k.push(o[p]);
            }
        }
        return k;
    };
}

(function() {

    function mergeOpts(allOptions, targetType) {
        var finalOpts = {};
        var name;

        for (name in allOptions) {
            if (name !== targetType) {
                finalOpts[name] = allOptions[name];
            }
        }

        //merge in the per type settings for the targetType
        if (targetType in allOptions) {
            for (name in allOptions[targetType]) {
                finalOpts[name] = allOptions[targetType][name];
            }
        }
        return finalOpts;
    }

    function js_beautify(js_source_text, options) {

        var acorn = {};
        (function(exports) {
            /* jshint curly: false */
            // This section of code is taken from acorn.
            //
            // Acorn was written by Marijn Haverbeke and released under an MIT
            // license. The Unicode regexps (for identifiers and whitespace) were
            // taken from [Esprima](http://esprima.org) by Ariya Hidayat.
            //
            // Git repositories for Acorn are available at
            //
            //     http://marijnhaverbeke.nl/git/acorn
            //     https://github.com/marijnh/acorn.git

            // ## Character categories

            // Big ugly regular expressions that match characters in the
            // whitespace, identifier, and identifier-start categories. These
            // are only applied when a character is found to actually have a
            // code point above 128.

            var nonASCIIwhitespace = /[\u1680\u180e\u2000-\u200a\u202f\u205f\u3000\ufeff]/; // jshint ignore:line
            var nonASCIIidentifierStartChars = "\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0370-\u0374\u0376\u0377\u037a-\u037d\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u048a-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05d0-\u05ea\u05f0-\u05f2\u0620-\u064a\u066e\u066f\u0671-\u06d3\u06d5\u06e5\u06e6\u06ee\u06ef\u06fa-\u06fc\u06ff\u0710\u0712-\u072f\u074d-\u07a5\u07b1\u07ca-\u07ea\u07f4\u07f5\u07fa\u0800-\u0815\u081a\u0824\u0828\u0840-\u0858\u08a0\u08a2-\u08ac\u0904-\u0939\u093d\u0950\u0958-\u0961\u0971-\u0977\u0979-\u097f\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bd\u09ce\u09dc\u09dd\u09df-\u09e1\u09f0\u09f1\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a59-\u0a5c\u0a5e\u0a72-\u0a74\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abd\u0ad0\u0ae0\u0ae1\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3d\u0b5c\u0b5d\u0b5f-\u0b61\u0b71\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bd0\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c33\u0c35-\u0c39\u0c3d\u0c58\u0c59\u0c60\u0c61\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cde\u0ce0\u0ce1\u0cf1\u0cf2\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d\u0d4e\u0d60\u0d61\u0d7a-\u0d7f\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0e01-\u0e30\u0e32\u0e33\u0e40-\u0e46\u0e81\u0e82\u0e84\u0e87\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa\u0eab\u0ead-\u0eb0\u0eb2\u0eb3\u0ebd\u0ec0-\u0ec4\u0ec6\u0edc-\u0edf\u0f00\u0f40-\u0f47\u0f49-\u0f6c\u0f88-\u0f8c\u1000-\u102a\u103f\u1050-\u1055\u105a-\u105d\u1061\u1065\u1066\u106e-\u1070\u1075-\u1081\u108e\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u1380-\u138f\u13a0-\u13f4\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f0\u1700-\u170c\u170e-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176c\u176e-\u1770\u1780-\u17b3\u17d7\u17dc\u1820-\u1877\u1880-\u18a8\u18aa\u18b0-\u18f5\u1900-\u191c\u1950-\u196d\u1970-\u1974\u1980-\u19ab\u19c1-\u19c7\u1a00-\u1a16\u1a20-\u1a54\u1aa7\u1b05-\u1b33\u1b45-\u1b4b\u1b83-\u1ba0\u1bae\u1baf\u1bba-\u1be5\u1c00-\u1c23\u1c4d-\u1c4f\u1c5a-\u1c7d\u1ce9-\u1cec\u1cee-\u1cf1\u1cf5\u1cf6\u1d00-\u1dbf\u1e00-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u2071\u207f\u2090-\u209c\u2102\u2107\u210a-\u2113\u2115\u2119-\u211d\u2124\u2126\u2128\u212a-\u212d\u212f-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2160-\u2188\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cee\u2cf2\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d80-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u2e2f\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303c\u3041-\u3096\u309d-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312d\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fcc\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua697\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua78e\ua790-\ua793\ua7a0-\ua7aa\ua7f8-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8f2-\ua8f7\ua8fb\ua90a-\ua925\ua930-\ua946\ua960-\ua97c\ua984-\ua9b2\ua9cf\uaa00-\uaa28\uaa40-\uaa42\uaa44-\uaa4b\uaa60-\uaa76\uaa7a\uaa80-\uaaaf\uaab1\uaab5\uaab6\uaab9-\uaabd\uaac0\uaac2\uaadb-\uaadd\uaae0-\uaaea\uaaf2-\uaaf4\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uabc0-\uabe2\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d\ufb1f-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe70-\ufe74\ufe76-\ufefc\uff21-\uff3a\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc";
            var nonASCIIidentifierChars = "\u0300-\u036f\u0483-\u0487\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u0620-\u0649\u0672-\u06d3\u06e7-\u06e8\u06fb-\u06fc\u0730-\u074a\u0800-\u0814\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0840-\u0857\u08e4-\u08fe\u0900-\u0903\u093a-\u093c\u093e-\u094f\u0951-\u0957\u0962-\u0963\u0966-\u096f\u0981-\u0983\u09bc\u09be-\u09c4\u09c7\u09c8\u09d7\u09df-\u09e0\u0a01-\u0a03\u0a3c\u0a3e-\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a66-\u0a71\u0a75\u0a81-\u0a83\u0abc\u0abe-\u0ac5\u0ac7-\u0ac9\u0acb-\u0acd\u0ae2-\u0ae3\u0ae6-\u0aef\u0b01-\u0b03\u0b3c\u0b3e-\u0b44\u0b47\u0b48\u0b4b-\u0b4d\u0b56\u0b57\u0b5f-\u0b60\u0b66-\u0b6f\u0b82\u0bbe-\u0bc2\u0bc6-\u0bc8\u0bca-\u0bcd\u0bd7\u0be6-\u0bef\u0c01-\u0c03\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62-\u0c63\u0c66-\u0c6f\u0c82\u0c83\u0cbc\u0cbe-\u0cc4\u0cc6-\u0cc8\u0cca-\u0ccd\u0cd5\u0cd6\u0ce2-\u0ce3\u0ce6-\u0cef\u0d02\u0d03\u0d46-\u0d48\u0d57\u0d62-\u0d63\u0d66-\u0d6f\u0d82\u0d83\u0dca\u0dcf-\u0dd4\u0dd6\u0dd8-\u0ddf\u0df2\u0df3\u0e34-\u0e3a\u0e40-\u0e45\u0e50-\u0e59\u0eb4-\u0eb9\u0ec8-\u0ecd\u0ed0-\u0ed9\u0f18\u0f19\u0f20-\u0f29\u0f35\u0f37\u0f39\u0f41-\u0f47\u0f71-\u0f84\u0f86-\u0f87\u0f8d-\u0f97\u0f99-\u0fbc\u0fc6\u1000-\u1029\u1040-\u1049\u1067-\u106d\u1071-\u1074\u1082-\u108d\u108f-\u109d\u135d-\u135f\u170e-\u1710\u1720-\u1730\u1740-\u1750\u1772\u1773\u1780-\u17b2\u17dd\u17e0-\u17e9\u180b-\u180d\u1810-\u1819\u1920-\u192b\u1930-\u193b\u1951-\u196d\u19b0-\u19c0\u19c8-\u19c9\u19d0-\u19d9\u1a00-\u1a15\u1a20-\u1a53\u1a60-\u1a7c\u1a7f-\u1a89\u1a90-\u1a99\u1b46-\u1b4b\u1b50-\u1b59\u1b6b-\u1b73\u1bb0-\u1bb9\u1be6-\u1bf3\u1c00-\u1c22\u1c40-\u1c49\u1c5b-\u1c7d\u1cd0-\u1cd2\u1d00-\u1dbe\u1e01-\u1f15\u200c\u200d\u203f\u2040\u2054\u20d0-\u20dc\u20e1\u20e5-\u20f0\u2d81-\u2d96\u2de0-\u2dff\u3021-\u3028\u3099\u309a\ua640-\ua66d\ua674-\ua67d\ua69f\ua6f0-\ua6f1\ua7f8-\ua800\ua806\ua80b\ua823-\ua827\ua880-\ua881\ua8b4-\ua8c4\ua8d0-\ua8d9\ua8f3-\ua8f7\ua900-\ua909\ua926-\ua92d\ua930-\ua945\ua980-\ua983\ua9b3-\ua9c0\uaa00-\uaa27\uaa40-\uaa41\uaa4c-\uaa4d\uaa50-\uaa59\uaa7b\uaae0-\uaae9\uaaf2-\uaaf3\uabc0-\uabe1\uabec\uabed\uabf0-\uabf9\ufb20-\ufb28\ufe00-\ufe0f\ufe20-\ufe26\ufe33\ufe34\ufe4d-\ufe4f\uff10-\uff19\uff3f";
            var nonASCIIidentifierStart = new RegExp("[" + nonASCIIidentifierStartChars + "]");
            var nonASCIIidentifier = new RegExp("[" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + "]");

            // Whether a single character denotes a newline.

            exports.newline = /[\n\r\u2028\u2029]/;

            // Matches a whole line break (where CRLF is considered a single
            // line break). Used to count lines.

            // in javascript, these two differ
            // in python they are the same, different methods are called on them
            exports.lineBreak = new RegExp('\r\n|' + exports.newline.source);
            exports.allLineBreaks = new RegExp(exports.lineBreak.source, 'g');


            // Test whether a given character code starts an identifier.

            exports.isIdentifierStart = function(code) {
                // permit $ (36) and @ (64). @ is used in ES7 decorators.
                if (code < 65) return code === 36 || code === 64;
                // 65 through 91 are uppercase letters.
                if (code < 91) return true;
                // permit _ (95).
                if (code < 97) return code === 95;
                // 97 through 123 are lowercase letters.
                if (code < 123) return true;
                return code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code));
            };

            // Test whether a given character is part of an identifier.

            exports.isIdentifierChar = function(code) {
                if (code < 48) return code === 36;
                if (code < 58) return true;
                if (code < 65) return false;
                if (code < 91) return true;
                if (code < 97) return code === 95;
                if (code < 123) return true;
                return code >= 0xaa && nonASCIIidentifier.test(String.fromCharCode(code));
            };
        })(acorn);
        /* jshint curly: true */

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

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

        function ltrim(s) {
            return s.replace(/^\s+/g, '');
        }

        // function rtrim(s) {
        //     return s.replace(/\s+$/g, '');
        // }

        function sanitizeOperatorPosition(opPosition) {
            opPosition = opPosition || OPERATOR_POSITION.before_newline;

            var validPositionValues = Object.values(OPERATOR_POSITION);

            if (!in_array(opPosition, validPositionValues)) {
                throw new Error("Invalid Option Value: The option 'operator_position' must be one of the following values\n" +
                    validPositionValues +
                    "\nYou passed in: '" + opPosition + "'");
            }

            return opPosition;
        }

        var OPERATOR_POSITION = {
            before_newline: 'before-newline',
            after_newline: 'after-newline',
            preserve_newline: 'preserve-newline',
        };

        var OPERATOR_POSITION_BEFORE_OR_PRESERVE = [OPERATOR_POSITION.before_newline, OPERATOR_POSITION.preserve_newline];

        var MODE = {
            BlockStatement: 'BlockStatement', // 'BLOCK'
            Statement: 'Statement', // 'STATEMENT'
            ObjectLiteral: 'ObjectLiteral', // 'OBJECT',
            ArrayLiteral: 'ArrayLiteral', //'[EXPRESSION]',
            ForInitializer: 'ForInitializer', //'(FOR-EXPRESSION)',
            Conditional: 'Conditional', //'(COND-EXPRESSION)',
            Expression: 'Expression' //'(EXPRESSION)'
        };

        function Beautifier(js_source_text, options) {
            "use strict";
            var output;
            var tokens = [],
                token_pos;
            var Tokenizer;
            var current_token;
            var last_type, last_last_text, indent_string;
            var flags, previous_flags, flag_store;
            var prefix;

            var handlers, opt;
            var baseIndentString = '';

            handlers = {
                'TK_START_EXPR': handle_start_expr,
                'TK_END_EXPR': handle_end_expr,
                'TK_START_BLOCK': handle_start_block,
                'TK_END_BLOCK': handle_end_block,
                'TK_WORD': handle_word,
                'TK_RESERVED': handle_word,
                'TK_SEMICOLON': handle_semicolon,
                'TK_STRING': handle_string,
                'TK_EQUALS': handle_equals,
                'TK_OPERATOR': handle_operator,
                'TK_COMMA': handle_comma,
                'TK_BLOCK_COMMENT': handle_block_comment,
                'TK_COMMENT': handle_comment,
                'TK_DOT': handle_dot,
                'TK_UNKNOWN': handle_unknown,
                'TK_EOF': handle_eof
            };

            function create_flags(flags_base, mode) {
                var next_indent_level = 0;
                if (flags_base) {
                    next_indent_level = flags_base.indentation_level;
                    if (!output.just_added_newline() &&
                        flags_base.line_indent_level > next_indent_level) {
                        next_indent_level = flags_base.line_indent_level;
                    }
                }

                var next_flags = {
                    mode: mode,
                    parent: flags_base,
                    last_text: flags_base ? flags_base.last_text : '', // last token text
                    last_word: flags_base ? flags_base.last_word : '', // last 'TK_WORD' passed
                    declaration_statement: false,
                    declaration_assignment: false,
                    multiline_frame: false,
                    inline_frame: false,
                    if_block: false,
                    else_block: false,
                    do_block: false,
                    do_while: false,
                    import_block: false,
                    in_case_statement: false, // switch(..){ INSIDE HERE }
                    in_case: false, // we're on the exact line with "case 0:"
                    case_body: false, // the indented case-action block
                    indentation_level: next_indent_level,
                    line_indent_level: flags_base ? flags_base.line_indent_level : next_indent_level,
                    start_line_index: output.get_line_number(),
                    ternary_depth: 0
                };
                return next_flags;
            }

            // Some interpreters have unexpected results with foo = baz || bar;
            options = options ? options : {};

            // Allow the setting of language/file-type specific options
            // with inheritance of overall settings
            options = mergeOpts(options, 'js');

            opt = {};

            // compatibility, re
            if (options.brace_style === "expand-strict") { //graceful handling of deprecated option
                options.brace_style = "expand";
            } else if (options.brace_style === "collapse-preserve-inline") { //graceful handling of deprecated option
                options.brace_style = "collapse,preserve-inline";
            } else if (options.braces_on_own_line !== undefined) { //graceful handling of deprecated option
                options.brace_style = options.braces_on_own_line ? "expand" : "collapse";
            } else if (!options.brace_style) //Nothing exists to set it
            {
                options.brace_style = "collapse";
            }


            var brace_style_split = options.brace_style.split(/[^a-zA-Z0-9_\-]+/);
            opt.brace_style = brace_style_split[0];
            opt.brace_preserve_inline = brace_style_split[1] ? brace_style_split[1] : false;

            opt.indent_size = options.indent_size ? parseInt(options.indent_size, 10) : 4;
            opt.indent_char = options.indent_char ? options.indent_char : ' ';
            opt.eol = options.eol ? options.eol : 'auto';
            opt.preserve_newlines = (options.preserve_newlines === undefined) ? true : options.preserve_newlines;
            opt.break_chained_methods = (options.break_chained_methods === undefined) ? false : options.break_chained_methods;
            opt.max_preserve_newlines = (options.max_preserve_newlines === undefined) ? 0 : parseInt(options.max_preserve_newlines, 10);
            opt.space_in_paren = (options.space_in_paren === undefined) ? false : options.space_in_paren;
            opt.space_in_empty_paren = (options.space_in_empty_paren === undefined) ? false : options.space_in_empty_paren;
            opt.jslint_happy = (options.jslint_happy === undefined) ? false : options.jslint_happy;
            opt.space_after_anon_function = (options.space_after_anon_function === undefined) ? false : options.space_after_anon_function;
            opt.keep_array_indentation = (options.keep_array_indentation === undefined) ? false : options.keep_array_indentation;
            opt.space_before_conditional = (options.space_before_conditional === undefined) ? true : options.space_before_conditional;
            opt.unescape_strings = (options.unescape_strings === undefined) ? false : options.unescape_strings;
            opt.wrap_line_length = (options.wrap_line_length === undefined) ? 0 : parseInt(options.wrap_line_length, 10);
            opt.e4x = (options.e4x === undefined) ? false : options.e4x;
            opt.end_with_newline = (options.end_with_newline === undefined) ? false : options.end_with_newline;
            opt.comma_first = (options.comma_first === undefined) ? false : options.comma_first;
            opt.operator_position = sanitizeOperatorPosition(options.operator_position);

            // For testing of beautify ignore:start directive
            opt.test_output_raw = (options.test_output_raw === undefined) ? false : options.test_output_raw;

            // force opt.space_after_anon_function to true if opt.jslint_happy
            if (opt.jslint_happy) {
                opt.space_after_anon_function = true;
            }

            if (options.indent_with_tabs) {
                opt.indent_char = '\t';
                opt.indent_size = 1;
            }

            if (opt.eol === 'auto') {
                opt.eol = '\n';
                if (js_source_text && acorn.lineBreak.test(js_source_text || '')) {
                    opt.eol = js_source_text.match(acorn.lineBreak)[0];
                }
            }

            opt.eol = opt.eol.replace(/\\r/, '\r').replace(/\\n/, '\n');

            //----------------------------------
            indent_string = '';
            while (opt.indent_size > 0) {
                indent_string += opt.indent_char;
                opt.indent_size -= 1;
            }

            var preindent_index = 0;
            if (js_source_text && js_source_text.length) {
                while ((js_source_text.charAt(preindent_index) === ' ' ||
                js_source_text.charAt(preindent_index) === '\t')) {
                    baseIndentString += js_source_text.charAt(preindent_index);
                    preindent_index += 1;
                }
                js_source_text = js_source_text.substring(preindent_index);
            }

            last_type = 'TK_START_BLOCK'; // last token type
            last_last_text = ''; // pre-last token text
            output = new Output(indent_string, baseIndentString);

            // If testing the ignore directive, start with output disable set to true
            output.raw = opt.test_output_raw;


            // Stack of parsing/formatting states, including MODE.
            // We tokenize, parse, and output in an almost purely a forward-only stream of token input
            // and formatted output.  This makes the beautifier less accurate than full parsers
            // but also far more tolerant of syntax errors.
            //
            // For example, the default mode is MODE.BlockStatement. If we see a '{' we push a new frame of type
            // MODE.BlockStatement on the the stack, even though it could be object literal.  If we later
            // encounter a ":", we'll switch to to MODE.ObjectLiteral.  If we then see a ";",
            // most full parsers would die, but the beautifier gracefully falls back to
            // MODE.BlockStatement and continues on.
            flag_store = [];
            set_mode(MODE.BlockStatement);

            this.beautify = function() {

                /*jshint onevar:true */
                var sweet_code;
                Tokenizer = new tokenizer(js_source_text, opt, indent_string);
                tokens = Tokenizer.tokenize();
                token_pos = 0;

                current_token = get_token();
                while (current_token) {
                    handlers[current_token.type]();

                    last_last_text = flags.last_text;
                    last_type = current_token.type;
                    flags.last_text = current_token.text;

                    token_pos += 1;
                    current_token = get_token();
                }

                sweet_code = output.get_code();
                if (opt.end_with_newline) {
                    sweet_code += '\n';
                }

                if (opt.eol !== '\n') {
                    sweet_code = sweet_code.replace(/[\n]/g, opt.eol);
                }

                return sweet_code;
            };

            function handle_whitespace_and_comments(local_token, preserve_statement_flags) {
                var newlines = local_token.newlines;
                var keep_whitespace = opt.keep_array_indentation && is_array(flags.mode);
                var temp_token = current_token;

                for (var h = 0; h < local_token.comments_before.length; h++) {
                    // The cleanest handling of inline comments is to treat them as though they aren't there.
                    // Just continue formatting and the behavior should be logical.
                    // Also ignore unknown tokens.  Again, this should result in better behavior.
                    current_token = local_token.comments_before[h];
                    handle_whitespace_and_comments(current_token, preserve_statement_flags);
                    handlers[current_token.type](preserve_statement_flags);
                }
                current_token = temp_token;

                if (keep_whitespace) {
                    for (var i = 0; i < newlines; i += 1) {
                        print_newline(i > 0, preserve_statement_flags);
                    }
                } else {
                    if (opt.max_preserve_newlines && newlines > opt.max_preserve_newlines) {
                        newlines = opt.max_preserve_newlines;
                    }

                    if (opt.preserve_newlines) {
                        if (local_token.newlines > 1) {
                            print_newline(false, preserve_statement_flags);
                            for (var j = 1; j < newlines; j += 1) {
                                print_newline(true, preserve_statement_flags);
                            }
                        }
                    }
                }

            }

            // we could use just string.split, but
            // IE doesn't like returning empty strings
            function split_linebreaks(s) {
                //return s.split(/\x0d\x0a|\x0a/);

                s = s.replace(acorn.allLineBreaks, '\n');
                var out = [],
                    idx = s.indexOf("\n");
                while (idx !== -1) {
                    out.push(s.substring(0, idx));
                    s = s.substring(idx + 1);
                    idx = s.indexOf("\n");
                }
                if (s.length) {
                    out.push(s);
                }
                return out;
            }

            var newline_restricted_tokens = ['break', 'continue', 'return', 'throw'];

            function allow_wrap_or_preserved_newline(force_linewrap) {
                force_linewrap = (force_linewrap === undefined) ? false : force_linewrap;

                // Never wrap the first token on a line
                if (output.just_added_newline()) {
                    return;
                }

                var shouldPreserveOrForce = (opt.preserve_newlines && current_token.wanted_newline) || force_linewrap;
                var operatorLogicApplies = in_array(flags.last_text, Tokenizer.positionable_operators) || in_array(current_token.text, Tokenizer.positionable_operators);

                if (operatorLogicApplies) {
                    var shouldPrintOperatorNewline = (
                            in_array(flags.last_text, Tokenizer.positionable_operators) &&
                            in_array(opt.operator_position, OPERATOR_POSITION_BEFORE_OR_PRESERVE)
                        ) ||
                        in_array(current_token.text, Tokenizer.positionable_operators);
                    shouldPreserveOrForce = shouldPreserveOrForce && shouldPrintOperatorNewline;
                }

                if (shouldPreserveOrForce) {
                    print_newline(false, true);
                } else if (opt.wrap_line_length) {
                    if (last_type === 'TK_RESERVED' && in_array(flags.last_text, newline_restricted_tokens)) {
                        // These tokens should never have a newline inserted
                        // between them and the following expression.
                        return;
                    }
                    var proposed_line_length = output.current_line.get_character_count() + current_token.text.length +
                        (output.space_before_token ? 1 : 0);
                    if (proposed_line_length >= opt.wrap_line_length) {
                        print_newline(false, true);
                    }
                }
            }

            function print_newline(force_newline, preserve_statement_flags) {
                if (!preserve_statement_flags) {
                    if (flags.last_text !== ';' && flags.last_text !== ',' && flags.last_text !== '=' && last_type !== 'TK_OPERATOR') {
                        var next_token = get_token(1);
                        while (flags.mode === MODE.Statement &&
                        !(flags.if_block && next_token && next_token.type === 'TK_RESERVED' && next_token.text === 'else') &&
                        !flags.do_block) {
                            restore_mode();
                        }
                    }
                }

                if (output.add_new_line(force_newline)) {
                    flags.multiline_frame = true;
                }
            }

            function print_token_line_indentation() {
                if (output.just_added_newline()) {
                    if (opt.keep_array_indentation && is_array(flags.mode) && current_token.wanted_newline) {
                        output.current_line.push(current_token.whitespace_before);
                        output.space_before_token = false;
                    } else if (output.set_indent(flags.indentation_level)) {
                        flags.line_indent_level = flags.indentation_level;
                    }
                }
            }

            function print_token(printable_token) {
                if (output.raw) {
                    output.add_raw_token(current_token);
                    return;
                }

                if (opt.comma_first && last_type === 'TK_COMMA' &&
                    output.just_added_newline()) {
                    if (output.previous_line.last() === ',') {
                        var popped = output.previous_line.pop();
                        // if the comma was already at the start of the line,
                        // pull back onto that line and reprint the indentation
                        if (output.previous_line.is_empty()) {
                            output.previous_line.push(popped);
                            output.trim(true);
                            output.current_line.pop();
                            output.trim();
                        }

                        // add the comma in front of the next token
                        print_token_line_indentation();
                        output.add_token(',');
                        output.space_before_token = true;
                    }
                }

                printable_token = printable_token || current_token.text;
                print_token_line_indentation();
                output.add_token(printable_token);
            }

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

            function deindent() {
                if (flags.indentation_level > 0 &&
                    ((!flags.parent) || flags.indentation_level > flags.parent.indentation_level)) {
                    flags.indentation_level -= 1;

                }
            }

            function set_mode(mode) {
                if (flags) {
                    flag_store.push(flags);
                    previous_flags = flags;
                } else {
                    previous_flags = create_flags(null, mode);
                }

                flags = create_flags(previous_flags, mode);
            }

            function is_array(mode) {
                return mode === MODE.ArrayLiteral;
            }

            function is_expression(mode) {
                return in_array(mode, [MODE.Expression, MODE.ForInitializer, MODE.Conditional]);
            }

            function restore_mode() {
                if (flag_store.length > 0) {
                    previous_flags = flags;
                    flags = flag_store.pop();
                    if (previous_flags.mode === MODE.Statement) {
                        output.remove_redundant_indentation(previous_flags);
                    }
                }
            }

            function start_of_object_property() {
                return flags.parent.mode === MODE.ObjectLiteral && flags.mode === MODE.Statement && (
                    (flags.last_text === ':' && flags.ternary_depth === 0) || (last_type === 'TK_RESERVED' && in_array(flags.last_text, ['get', 'set'])));
            }

            function start_of_statement() {
                if (
                    (last_type === 'TK_RESERVED' && in_array(flags.last_text, ['var', 'let', 'const']) && current_token.type === 'TK_WORD') ||
                    (last_type === 'TK_RESERVED' && flags.last_text === 'do') ||
                    (last_type === 'TK_RESERVED' && in_array(flags.last_text, ['return', 'throw']) && !current_token.wanted_newline) ||
                    (last_type === 'TK_RESERVED' && flags.last_text === 'else' &&
                    !(current_token.type === 'TK_RESERVED' && current_token.text === 'if' && !current_token.comments_before.length)) ||
                    (last_type === 'TK_END_EXPR' && (previous_flags.mode === MODE.ForInitializer || previous_flags.mode === MODE.Conditional)) ||
                    (last_type === 'TK_WORD' && flags.mode === MODE.BlockStatement &&
                    !flags.in_case &&
                    !(current_token.text === '--' || current_token.text === '++') &&
                    last_last_text !== 'function' &&
                    current_token.type !== 'TK_WORD' && current_token.type !== 'TK_RESERVED') ||
                    (flags.mode === MODE.ObjectLiteral && (
                    (flags.last_text === ':' && flags.ternary_depth === 0) || (last_type === 'TK_RESERVED' && in_array(flags.last_text, ['get', 'set']))))
                ) {

                    set_mode(MODE.Statement);
                    indent();

                    handle_whitespace_and_comments(current_token, true);

                    // Issue #276:
                    // If starting a new statement with [if, for, while, do], push to a new line.
                    // if (a) if (b) if(c) d(); else e(); else f();
                    if (!start_of_object_property()) {
                        allow_wrap_or_preserved_newline(
                            current_token.type === 'TK_RESERVED' && in_array(current_token.text, ['do', 'for', 'if', 'while']));
                    }

                    return true;
                }
                return false;
            }

            function all_lines_start_with(lines, c) {
                for (var i = 0; i < lines.length; i++) {
                    var line = trim(lines[i]);
                    if (line.charAt(0) !== c) {
                        return false;
                    }
                }
                return true;
            }

            function each_line_matches_indent(lines, indent) {
                var i = 0,
                    len = lines.length,
                    line;
                for (; i < len; i++) {
                    line = lines[i];
                    // allow empty lines to pass through
                    if (line && line.indexOf(indent) !== 0) {
                        return false;
                    }
                }
                return true;
            }

            function is_special_word(word) {
                return in_array(word, ['case', 'return', 'do', 'if', 'throw', 'else']);
            }

            function get_token(offset) {
                var index = token_pos + (offset || 0);
                return (index < 0 || index >= tokens.length) ? null : tokens[index];
            }

            function handle_start_expr() {
                // The conditional starts the statement if appropriate.
                if (!start_of_statement()) {
                    handle_whitespace_and_comments(current_token);
                }

                var next_mode = MODE.Expression;
                if (current_token.text === '[') {

                    if (last_type === 'TK_WORD' || flags.last_text === ')') {
                        // this is array index specifier, break immediately
                        // a[x], fn()[x]
                        if (last_type === 'TK_RESERVED' && in_array(flags.last_text, Tokenizer.line_starters)) {
                            output.space_before_token = true;
                        }
                        set_mode(next_mode);
                        print_token();
                        indent();
                        if (opt.space_in_paren) {
                            output.space_before_token = true;
                        }
                        return;
                    }

                    next_mode = MODE.ArrayLiteral;
                    if (is_array(flags.mode)) {
                        if (flags.last_text === '[' ||
                            (flags.last_text === ',' && (last_last_text === ']' || last_last_text === '}'))) {
                            // ], [ goes to new line
                            // }, [ goes to new line
                            if (!opt.keep_array_indentation) {
                                print_newline();
                            }
                        }
                    }

                } else {
                    if (last_type === 'TK_RESERVED' && flags.last_text === 'for') {
                        next_mode = MODE.ForInitializer;
                    } else if (last_type === 'TK_RESERVED' && in_array(flags.last_text, ['if', 'while'])) {
                        next_mode = MODE.Conditional;
                    } else {
                        // next_mode = MODE.Expression;
                    }
                }

                if (flags.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' || flags.last_text === '.') {
                    // TODO: Consider whether forcing this is required.  Review failing tests when removed.
                    allow_wrap_or_preserved_newline(current_token.wanted_newline);
                    // do nothing on (( and )( and ][ and ]( and .(
                } else if (!(last_type === 'TK_RESERVED' && current_token.text === '(') && last_type !== 'TK_WORD' && last_type !== 'TK_OPERATOR') {
                    output.space_before_token = true;
                } else if ((last_type === 'TK_RESERVED' && (flags.last_word === 'function' || flags.last_word === 'typeof')) ||
                    (flags.last_text === '*' &&
                    (in_array(last_last_text, ['function', 'yield']) ||
                    (flags.mode === MODE.ObjectLiteral && in_array(last_last_text, ['{', ',']))))) {
                    // function() vs function ()
                    // yield*() vs yield* ()
                    // function*() vs function* ()
                    if (opt.space_after_anon_function) {
                        output.space_before_token = true;
                    }
                } else if (last_type === 'TK_RESERVED' && (in_array(flags.last_text, Tokenizer.line_starters) || flags.last_text === 'catch')) {
                    if (opt.space_before_conditional) {
                        output.space_before_token = true;
                    }
                }

                // Should be a space between await and an IIFE
                if (current_token.text === '(' && last_type === 'TK_RESERVED' && flags.last_word === 'await') {
                    output.space_before_token = true;
                }

                // Support of this kind of newline preservation.
                // a = (b &&
                //     (c || d));
                if (current_token.text === '(') {
                    if (last_type === 'TK_EQUALS' || last_type === 'TK_OPERATOR') {
                        if (!start_of_object_property()) {
                            allow_wrap_or_preserved_newline();
                        }
                    }
                }

                // Support preserving wrapped arrow function expressions
                // a.b('c',
                //     () => d.e
                // )
                if (current_token.text === '(' && last_type !== 'TK_WORD' && last_type !== 'TK_RESERVED') {
                    allow_wrap_or_preserved_newline();
                }

                set_mode(next_mode);
                print_token();
                if (opt.space_in_paren) {
                    output.space_before_token = true;
                }

                // In all cases, if we newline while inside an expression it should be indented.
                indent();
            }

            function handle_end_expr() {
                // statements inside expressions are not valid syntax, but...
                // statements must all be closed when their container closes
                while (flags.mode === MODE.Statement) {
                    restore_mode();
                }

                handle_whitespace_and_comments(current_token);

                if (flags.multiline_frame) {
                    allow_wrap_or_preserved_newline(current_token.text === ']' && is_array(flags.mode) && !opt.keep_array_indentation);
                }

                if (opt.space_in_paren) {
                    if (last_type === 'TK_START_EXPR' && !opt.space_in_empty_paren) {
                        // () [] no inner space in empty parens like these, ever, ref #320
                        output.trim();
                        output.space_before_token = false;
                    } else {
                        output.space_before_token = true;
                    }
                }
                if (current_token.text === ']' && opt.keep_array_indentation) {
                    print_token();
                    restore_mode();
                } else {
                    restore_mode();
                    print_token();
                }
                output.remove_redundant_indentation(previous_flags);

                // do {} while () // no statement required after
                if (flags.do_while && previous_flags.mode === MODE.Conditional) {
                    previous_flags.mode = MODE.Expression;
                    flags.do_block = false;
                    flags.do_while = false;

                }
            }

            function handle_start_block() {
                handle_whitespace_and_comments(current_token);

                // Check if this is should be treated as a ObjectLiteral
                var next_token = get_token(1);
                var second_token = get_token(2);
                if (second_token && (
                        (in_array(second_token.text, [':', ',']) && in_array(next_token.type, ['TK_STRING', 'TK_WORD', 'TK_RESERVED'])) ||
                        (in_array(next_token.text, ['get', 'set', '...']) && in_array(second_token.type, ['TK_WORD', 'TK_RESERVED']))
                    )) {
                    // We don't support TypeScript,but we didn't break it for a very long time.
                    // We'll try to keep not breaking it.
                    if (!in_array(last_last_text, ['class', 'interface'])) {
                        set_mode(MODE.ObjectLiteral);
                    } else {
                        set_mode(MODE.BlockStatement);
                    }
                } else if (last_type === 'TK_OPERATOR' && flags.last_text === '=>') {
                    // arrow function: (param1, paramN) => { statements }
                    set_mode(MODE.BlockStatement);
                } else if (in_array(last_type, ['TK_EQUALS', 'TK_START_EXPR', 'TK_COMMA', 'TK_OPERATOR']) ||
                    (last_type === 'TK_RESERVED' && in_array(flags.last_text, ['return', 'throw', 'import', 'default']))
                ) {
                    // Detecting shorthand function syntax is difficult by scanning forward,
                    //     so check the surrounding context.
                    // If the block is being returned, imported, export default, passed as arg,
                    //     assigned with = or assigned in a nested object, treat as an ObjectLiteral.
                    set_mode(MODE.ObjectLiteral);
                } else {
                    set_mode(MODE.BlockStatement);
                }

                var empty_braces = !next_token.comments_before.length && next_token.text === '}';
                var empty_anonymous_function = empty_braces && flags.last_word === 'function' &&
                    last_type === 'TK_END_EXPR';

                if (opt.brace_preserve_inline) // check for inline, set inline_frame if so
                {
                    // search forward for a newline wanted inside this block
                    var index = 0;
                    var check_token = null;
                    flags.inline_frame = true;
                    do {
                        index += 1;
                        check_token = get_token(index);
                        if (check_token.wanted_newline) {
                            flags.inline_frame = false;
                            break;
                        }
                    } while (check_token.type !== 'TK_EOF' &&
                    !(check_token.type === 'TK_END_BLOCK' && check_token.opened === current_token));
                }

                if ((opt.brace_style === "expand" ||
                    (opt.brace_style === "none" && current_token.wanted_newline)) &&
                    !flags.inline_frame) {
                    if (last_type !== 'TK_OPERATOR' &&
                        (empty_anonymous_function ||
                        last_type === 'TK_EQUALS' ||
                        (last_type === 'TK_RESERVED' && is_special_word(flags.last_text) && flags.last_text !== 'else'))) {
                        output.space_before_token = true;
                    } else {
                        print_newline(false, true);
                    }
                } else { // collapse || inline_frame
                    if (is_array(previous_flags.mode) && (last_type === 'TK_START_EXPR' || last_type === 'TK_COMMA')) {
                        if (last_type === 'TK_COMMA' || opt.space_in_paren) {
                            output.space_before_token = true;
                        }

                        if (last_type === 'TK_COMMA' || (last_type === 'TK_START_EXPR' && flags.inline_frame)) {
                            allow_wrap_or_preserved_newline();
                            previous_flags.multiline_frame = previous_flags.multiline_frame || flags.multiline_frame;
                            flags.multiline_frame = false;
                        }
                    }
                    if (last_type !== 'TK_OPERATOR' && last_type !== 'TK_START_EXPR') {
                        if (last_type === 'TK_START_BLOCK' && !flags.inline_frame) {
                            print_newline();
                        } else {
                            output.space_before_token = true;
                        }
                    }
                }
                print_token();
                indent();
            }

            function handle_end_block() {
                // statements must all be closed when their container closes
                handle_whitespace_and_comments(current_token);

                while (flags.mode === MODE.Statement) {
                    restore_mode();
                }

                var empty_braces = last_type === 'TK_START_BLOCK';

                if (flags.inline_frame && !empty_braces) { // try inline_frame (only set if opt.braces-preserve-inline) first
                    output.space_before_token = true;
                } else if (opt.brace_style === "expand") {
                    if (!empty_braces) {
                        print_newline();
                    }
                } else {
                    // skip {}
                    if (!empty_braces) {
                        if (is_array(flags.mode) && opt.keep_array_indentation) {
                            // we REALLY need a newline here, but newliner would skip that
                            opt.keep_array_indentation = false;
                            print_newline();
                            opt.keep_array_indentation = true;

                        } else {
                            print_newline();
                        }
                    }
                }
                restore_mode();
                print_token();
            }

            function handle_word() {
                if (current_token.type === 'TK_RESERVED') {
                    if (in_array(current_token.text, ['set', 'get']) && flags.mode !== MODE.ObjectLiteral) {
                        current_token.type = 'TK_WORD';
                    } else if (in_array(current_token.text, ['as', 'from']) && !flags.import_block) {
                        current_token.type = 'TK_WORD';
                    } else if (flags.mode === MODE.ObjectLiteral) {
                        var next_token = get_token(1);
                        if (next_token.text === ':') {
                            current_token.type = 'TK_WORD';
                        }
                    }
                }

                if (start_of_statement()) {
                    // The conditional starts the statement if appropriate.
                    if (last_type === 'TK_RESERVED' && in_array(flags.last_text, ['var', 'let', 'const']) && current_token.type === 'TK_WORD') {
                        flags.declaration_statement = true;
                    }
                } else if (current_token.wanted_newline && !is_expression(flags.mode) &&
                    (last_type !== 'TK_OPERATOR' || (flags.last_text === '--' || flags.last_text === '++')) &&
                    last_type !== 'TK_EQUALS' &&
                    (opt.preserve_newlines || !(last_type === 'TK_RESERVED' && in_array(flags.last_text, ['var', 'let', 'const', 'set', 'get'])))) {
                    handle_whitespace_and_comments(current_token);
                    print_newline();
                } else {
                    handle_whitespace_and_comments(current_token);
                }

                if (flags.do_block && !flags.do_while) {
                    if (current_token.type === 'TK_RESERVED' && current_token.text === 'while') {
                        // do {} ## while ()
                        output.space_before_token = true;
                        print_token();
                        output.space_before_token = true;
                        flags.do_while = true;
                        return;
                    } else {
                        // do {} should always have while as the next word.
                        // if we don't see the expected while, recover
                        print_newline();
                        flags.do_block = false;
                    }
                }

                // if may be followed by else, or not
                // Bare/inline ifs are tricky
                // Need to unwind the modes correctly: if (a) if (b) c(); else d(); else e();
                if (flags.if_block) {
                    if (!flags.else_block && (current_token.type === 'TK_RESERVED' && current_token.text === 'else')) {
                        flags.else_block = true;
                    } else {
                        while (flags.mode === MODE.Statement) {
                            restore_mode();
                        }
                        flags.if_block = false;
                        flags.else_block = false;
                    }
                }

                if (current_token.type === 'TK_RESERVED' && (current_token.text === 'case' || (current_token.text === 'default' && flags.in_case_statement))) {
                    print_newline();
                    if (flags.case_body || opt.jslint_happy) {
                        // switch cases following one another
                        deindent();
                        flags.case_body = false;
                    }
                    print_token();
                    flags.in_case = true;
                    flags.in_case_statement = true;
                    return;
                }

                if (last_type === 'TK_COMMA' || last_type === 'TK_START_EXPR' || last_type === 'TK_EQUALS' || last_type === 'TK_OPERATOR') {
                    if (!start_of_object_property()) {
                        allow_wrap_or_preserved_newline();
                    }
                }

                if (current_token.type === 'TK_RESERVED' && current_token.text === 'function') {
                    if (in_array(flags.last_text, ['}', ';']) ||
                        (output.just_added_newline() && !(in_array(flags.last_text, ['(', '[', '{', ':', '=', ',']) || last_type === 'TK_OPERATOR'))) {
                        // make sure there is a nice clean space of at least one blank line
                        // before a new function definition
                        if (!output.just_added_blankline() && !current_token.comments_before.length) {
                            print_newline();
                            print_newline(true);
                        }
                    }
                    if (last_type === 'TK_RESERVED' || last_type === 'TK_WORD') {
                        if (last_type === 'TK_RESERVED' && in_array(flags.last_text, ['get', 'set', 'new', 'return', 'export', 'async'])) {
                            output.space_before_token = true;
                        } else if (last_type === 'TK_RESERVED' && flags.last_text === 'default' && last_last_text === 'export') {
                            output.space_before_token = true;
                        } else {
                            print_newline();
                        }
                    } else if (last_type === 'TK_OPERATOR' || flags.last_text === '=') {
                        // foo = function
                        output.space_before_token = true;
                    } else if (!flags.multiline_frame && (is_expression(flags.mode) || is_array(flags.mode))) {
                        // (function
                    } else {
                        print_newline();
                    }

                    print_token();
                    flags.last_word = current_token.text;
                    return;
                }

                prefix = 'NONE';

                if (last_type === 'TK_END_BLOCK') {

                    if (previous_flags.inline_frame) {
                        prefix = 'SPACE';
                    } else if (!(current_token.type === 'TK_RESERVED' && in_array(current_token.text, ['else', 'catch', 'finally', 'from']))) {
                        prefix = 'NEWLINE';
                    } else {
                        if (opt.brace_style === "expand" ||
                            opt.brace_style === "end-expand" ||
                            (opt.brace_style === "none" && current_token.wanted_newline)) {
                            prefix = 'NEWLINE';
                        } else {
                            prefix = 'SPACE';
                            output.space_before_token = true;
                        }
                    }
                } else if (last_type === 'TK_SEMICOLON' && flags.mode === MODE.BlockStatement) {
                    // TODO: Should this be for STATEMENT as well?
                    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_RESERVED' || last_type === 'TK_WORD' ||
                    (flags.last_text === '*' &&
                    (in_array(last_last_text, ['function', 'yield']) ||
                    (flags.mode === MODE.ObjectLiteral && in_array(last_last_text, ['{', ',']))))) {
                    prefix = 'SPACE';
                } else if (last_type === 'TK_START_BLOCK') {
                    if (flags.inline_frame) {
                        prefix = 'SPACE';
                    } else {
                        prefix = 'NEWLINE';
                    }
                } else if (last_type === 'TK_END_EXPR') {
                    output.space_before_token = true;
                    prefix = 'NEWLINE';
                }

                if (current_token.type === 'TK_RESERVED' && in_array(current_token.text, Tokenizer.line_starters) && flags.last_text !== ')') {
                    if (flags.inline_frame || flags.last_text === 'else' || flags.last_text === 'export') {
                        prefix = 'SPACE';
                    } else {
                        prefix = 'NEWLINE';
                    }

                }

                if (current_token.type === 'TK_RESERVED' && in_array(current_token.text, ['else', 'catch', 'finally'])) {
                    if ((!(last_type === 'TK_END_BLOCK' && previous_flags.mode === MODE.BlockStatement) ||
                        opt.brace_style === "expand" ||
                        opt.brace_style === "end-expand" ||
                        (opt.brace_style === "none" && current_token.wanted_newline)) &&
                        !flags.inline_frame) {
                        print_newline();
                    } else {
                        output.trim(true);
                        var line = output.current_line;
                        // If we trimmed and there's something other than a close block before us
                        // put a newline back in.  Handles '} // comment' scenario.
                        if (line.last() !== '}') {
                            print_newline();
                        }
                        output.space_before_token = true;
                    }
                } else if (prefix === 'NEWLINE') {
                    if (last_type === 'TK_RESERVED' && is_special_word(flags.last_text)) {
                        // no newline between 'return nnn'
                        output.space_before_token = true;
                    } else if (last_type !== 'TK_END_EXPR') {
                        if ((last_type !== 'TK_START_EXPR' || !(current_token.type === 'TK_RESERVED' && in_array(current_token.text, ['var', 'let', 'const']))) && flags.last_text !== ':') {
                            // no need to force newline on 'var': for (var x = 0...)
                            if (current_token.type === 'TK_RESERVED' && current_token.text === 'if' && flags.last_text === 'else') {
                                // no newline for } else if {
                                output.space_before_token = true;
                            } else {
                                print_newline();
                            }
                        }
                    } else if (current_token.type === 'TK_RESERVED' && in_array(current_token.text, Tokenizer.line_starters) && flags.last_text !== ')') {
                        print_newline();
                    }
                } else if (flags.multiline_frame && is_array(flags.mode) && flags.last_text === ',' && last_last_text === '}') {
                    print_newline(); // }, in lists get a newline treatment
                } else if (prefix === 'SPACE') {
                    output.space_before_token = true;
                }
                print_token();
                flags.last_word = current_token.text;

                if (current_token.type === 'TK_RESERVED') {
                    if (current_token.text === 'do') {
                        flags.do_block = true;
                    } else if (current_token.text === 'if') {
                        flags.if_block = true;
                    } else if (current_token.text === 'import') {
                        flags.import_block = true;
                    } else if (flags.import_block && current_token.type === 'TK_RESERVED' && current_token.text === 'from') {
                        flags.import_block = false;
                    }
                }
            }

            function handle_semicolon() {
                if (start_of_statement()) {
                    // The conditional starts the statement if appropriate.
                    // Semicolon can be the start (and end) of a statement
                    output.space_before_token = false;
                } else {
                    handle_whitespace_and_comments(current_token);
                }

                var next_token = get_token(1);
                while (flags.mode === MODE.Statement &&
                !(flags.if_block && next_token && next_token.type === 'TK_RESERVED' && next_token.text === 'else') &&
                !flags.do_block) {
                    restore_mode();
                }

                // hacky but effective for the moment
                if (flags.import_block) {
                    flags.import_block = false;
                }
                print_token();
            }

            function handle_string() {
                if (start_of_statement()) {
                    // The conditional starts the statement if appropriate.
                    // One difference - strings want at least a space before
                    output.space_before_token = true;
                } else {
                    handle_whitespace_and_comments(current_token);
                    if (last_type === 'TK_RESERVED' || last_type === 'TK_WORD' || flags.inline_frame) {
                        output.space_before_token = true;
                    } else if (last_type === 'TK_COMMA' || last_type === 'TK_START_EXPR' || last_type === 'TK_EQUALS' || last_type === 'TK_OPERATOR') {
                        if (!start_of_object_property()) {
                            allow_wrap_or_preserved_newline();
                        }
                    } else {
                        print_newline();
                    }
                }
                print_token();
            }

            function handle_equals() {
                if (start_of_statement()) {
                    // The conditional starts the statement if appropriate.
                } else {
                    handle_whitespace_and_comments(current_token);
                }

                if (flags.declaration_statement) {
                    // just got an '=' in a var-line, different formatting/line-breaking, etc will now be done
                    flags.declaration_assignment = true;
                }
                output.space_before_token = true;
                print_token();
                output.space_before_token = true;
            }

            function handle_comma() {
                handle_whitespace_and_comments(current_token, true);

                print_token();
                output.space_before_token = true;
                if (flags.declaration_statement) {
                    if (is_expression(flags.parent.mode)) {
                        // do not break on comma, for(var a = 1, b = 2)
                        flags.declaration_assignment = false;
                    }

                    if (flags.declaration_assignment) {
                        flags.declaration_assignment = false;
                        print_newline(false, true);
                    } else if (opt.comma_first) {
                        // for comma-first, we want to allow a newline before the comma
                        // to turn into a newline after the comma, which we will fixup later
                        allow_wrap_or_preserved_newline();
                    }
                } else if (flags.mode === MODE.ObjectLiteral ||
                    (flags.mode === MODE.Statement && flags.parent.mode === MODE.ObjectLiteral)) {
                    if (flags.mode === MODE.Statement) {
                        restore_mode();
                    }

                    if (!flags.inline_frame) {
                        print_newline();
                    }
                } else if (opt.comma_first) {
                    // EXPR or DO_BLOCK
                    // for comma-first, we want to allow a newline before the comma
                    // to turn into a newline after the comma, which we will fixup later
                    allow_wrap_or_preserved_newline();
                }
            }

            function handle_operator() {
                var isGeneratorAsterisk = current_token.text === '*' &&
                    ((last_type === 'TK_RESERVED' && in_array(flags.last_text, ['function', 'yield'])) ||
                        (in_array(last_type, ['TK_START_BLOCK', 'TK_COMMA', 'TK_END_BLOCK', 'TK_SEMICOLON']))
                    );
                var isUnary = in_array(current_token.text, ['-', '+']) && (
                        in_array(last_type, ['TK_START_BLOCK', 'TK_START_EXPR', 'TK_EQUALS', 'TK_OPERATOR']) ||
                        in_array(flags.last_text, Tokenizer.line_starters) ||
                        flags.last_text === ','
                    );

                if (start_of_statement()) {
                    // The conditional starts the statement if appropriate.
                } else {
                    var preserve_statement_flags = !isGeneratorAsterisk;
                    handle_whitespace_and_comments(current_token, preserve_statement_flags);
                }

                if (last_type === 'TK_RESERVED' && is_special_word(flags.last_text)) {
                    // "return" had a special handling in TK_WORD. Now we need to return the favor
                    output.space_before_token = true;
                    print_token();
                    return;
                }

                // hack for actionscript's import .*;
                if (current_token.text === '*' && last_type === 'TK_DOT') {
                    print_token();
                    return;
                }

                if (current_token.text === '::') {
                    // no spaces around exotic namespacing syntax operator
                    print_token();
                    return;
                }

                // Allow line wrapping between operators when operator_position is
                //   set to before or preserve
                if (last_type === 'TK_OPERATOR' && in_array(opt.operator_position, OPERATOR_POSITION_BEFORE_OR_PRESERVE)) {
                    allow_wrap_or_preserved_newline();
                }

                if (current_token.text === ':' && flags.in_case) {
                    flags.case_body = true;
                    indent();
                    print_token();
                    print_newline();
                    flags.in_case = false;
                    return;
                }

                var space_before = true;
                var space_after = true;
                var in_ternary = false;
                if (current_token.text === ':') {
                    if (flags.ternary_depth === 0) {
                        // Colon is invalid javascript outside of ternary and object, but do our best to guess what was meant.
                        space_before = false;
                    } else {
                        flags.ternary_depth -= 1;
                        in_ternary = true;
                    }
                } else if (current_token.text === '?') {
                    flags.ternary_depth += 1;
                }

                // let's handle the operator_position option prior to any conflicting logic
                if (!isUnary && !isGeneratorAsterisk && opt.preserve_newlines && in_array(current_token.text, Tokenizer.positionable_operators)) {
                    var isColon = current_token.text === ':';
                    var isTernaryColon = (isColon && in_ternary);
                    var isOtherColon = (isColon && !in_ternary);

                    switch (opt.operator_position) {
                        case OPERATOR_POSITION.before_newline:
                            // if the current token is : and it's not a ternary statement then we set space_before to false
                            output.space_before_token = !isOtherColon;

                            print_token();

                            if (!isColon || isTernaryColon) {
                                allow_wrap_or_preserved_newline();
                            }

                            output.space_before_token = true;
                            return;

                        case OPERATOR_POSITION.after_newline:
                            // if the current token is anything but colon, or (via deduction) it's a colon and in a ternary statement,
                            //   then print a newline.

                            output.space_before_token = true;

                            if (!isColon || isTernaryColon) {
                                if (get_token(1).wanted_newline) {
                                    print_newline(false, true);
                                } else {
                                    allow_wrap_or_preserved_newline();
                                }
                            } else {
                                output.space_before_token = false;
                            }

                            print_token();

                            output.space_before_token = true;
                            return;

                        case OPERATOR_POSITION.preserve_newline:
                            if (!isOtherColon) {
                                allow_wrap_or_preserved_newline();
                            }

                            // if we just added a newline, or the current token is : and it's not a ternary statement,
                            //   then we set space_before to false
                            space_before = !(output.just_added_newline() || isOtherColon);

                            output.space_before_token = space_before;
                            print_token();
                            output.space_before_token = true;
                            return;
                    }
                }

                if (isGeneratorAsterisk) {
                    allow_wrap_or_preserved_newline();
                    space_before = false;
                    var next_token = get_token(1);
                    space_after = next_token && in_array(next_token.type, ['TK_WORD', 'TK_RESERVED']);
                } else if (current_token.text === '...') {
                    allow_wrap_or_preserved_newline();
                    space_before = last_type === 'TK_START_BLOCK';
                    space_after = false;
                } else if (in_array(current_token.text, ['--', '++', '!', '~']) || isUnary) {
                    // unary operators (and binary +/- pretending to be unary) special cases

                    space_before = false;
                    space_after = false;

                    // http://www.ecma-international.org/ecma-262/5.1/#sec-7.9.1
                    // if there is a newline between -- or ++ and anything else we should preserve it.
                    if (current_token.wanted_newline && (current_token.text === '--' || current_token.text === '++')) {
                        print_newline(false, true);
                    }

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

                    if (last_type === 'TK_RESERVED') {
                        space_before = true;
                    } else if (last_type === 'TK_END_EXPR') {
                        space_before = !(flags.last_text === ']' && (current_token.text === '--' || current_token.text === '++'));
                    } else if (last_type === 'TK_OPERATOR') {
                        // a++ + ++b;
                        // a - -b
                        space_before = in_array(current_token.text, ['--', '-', '++', '+']) && in_array(flags.last_text, ['--', '-', '++', '+']);
                        // + and - are not unary when preceeded by -- or ++ operator
                        // a-- + b
                        // a * +b
                        // a - -b
                        if (in_array(current_token.text, ['+', '-']) && in_array(flags.last_text, ['--', '++'])) {
                            space_after = true;
                        }
                    }


                    if (((flags.mode === MODE.BlockStatement && !flags.inline_frame) || flags.mode === MODE.Statement) &&
                        (flags.last_text === '{' || flags.last_text === ';')) {
                        // { foo; --i }
                        // foo(); --bar;
                        print_newline();
                    }
                }

                output.space_before_token = output.space_before_token || space_before;
                print_token();
                output.space_before_token = space_after;
            }

            function handle_block_comment(preserve_statement_flags) {
                if (output.raw) {
                    output.add_raw_token(current_token);
                    if (current_token.directives && current_token.directives.preserve === 'end') {
                        // If we're testing the raw output behavior, do not allow a directive to turn it off.
                        output.raw = opt.test_output_raw;
                    }
                    return;
                }

                if (current_token.directives) {
                    print_newline(false, preserve_statement_flags);
                    print_token();
                    if (current_token.directives.preserve === 'start') {
                        output.raw = true;
                    }
                    print_newline(false, true);
                    return;
                }

                // inline block
                if (!acorn.newline.test(current_token.text) && !current_token.wanted_newline) {
                    output.space_before_token = true;
                    print_token();
                    output.space_before_token = true;
                    return;
                }

                var lines = split_linebreaks(current_token.text);
                var j; // iterator for this case
                var javadoc = false;
                var starless = false;
                var lastIndent = current_token.whitespace_before;
                var lastIndentLength = lastIndent.length;

                // block comment starts with a new line
                print_newline(false, preserve_statement_flags);
                if (lines.length > 1) {
                    javadoc = all_lines_start_with(lines.slice(1), '*');
                    starless = each_line_matches_indent(lines.slice(1), lastIndent);
                }

                // first line always indented
                print_token(lines[0]);
                for (j = 1; j < lines.length; j++) {
                    print_newline(false, true);
                    if (javadoc) {
                        // javadoc: reformat and re-indent
                        print_token(' ' + ltrim(lines[j]));
                    } else if (starless && lines[j].length > lastIndentLength) {
                        // starless: re-indent non-empty content, avoiding trim
                        print_token(lines[j].substring(lastIndentLength));
                    } else {
                        // normal comments output raw
                        output.add_token(lines[j]);
                    }
                }

                // for comments of more than one line, make sure there's a new line after
                print_newline(false, preserve_statement_flags);
            }

            function handle_comment(preserve_statement_flags) {
                if (current_token.wanted_newline) {
                    print_newline(false, preserve_statement_flags);
                } else {
                    output.trim(true);
                }

                output.space_before_token = true;
                print_token();
                print_newline(false, preserve_statement_flags);
            }

            function handle_dot() {
                if (start_of_statement()) {
                    // The conditional starts the statement if appropriate.
                } else {
                    handle_whitespace_and_comments(current_token, true);
                }

                if (last_type === 'TK_RESERVED' && is_special_word(flags.last_text)) {
                    output.space_before_token = true;
                } else {
                    // allow preserved newlines before dots in general
                    // force newlines on dots after close paren when break_chained - for bar().baz()
                    allow_wrap_or_preserved_newline(flags.last_text === ')' && opt.break_chained_methods);
                }

                print_token();
            }

            function handle_unknown(preserve_statement_flags) {
                print_token();

                if (current_token.text[current_token.text.length - 1] === '\n') {
                    print_newline(false, preserve_statement_flags);
                }
            }

            function handle_eof() {
                // Unwind any open statements
                while (flags.mode === MODE.Statement) {
                    restore_mode();
                }
                handle_whitespace_and_comments(current_token);
            }
        }


        function OutputLine(parent) {
            var _character_count = 0;
            // use indent_count as a marker for lines that have preserved indentation
            var _indent_count = -1;

            var _items = [];
            var _empty = true;

            this.set_indent = function(level) {
                _character_count = parent.baseIndentLength + level * parent.indent_length;
                _indent_count = level;
            };

            this.get_character_count = function() {
                return _character_count;
            };

            this.is_empty = function() {
                return _empty;
            };

            this.last = function() {
                if (!this._empty) {
                    return _items[_items.length - 1];
                } else {
                    return null;
                }
            };

            this.push = function(input) {
                _items.push(input);
                _character_count += input.length;
                _empty = false;
            };

            this.pop = function() {
                var item = null;
                if (!_empty) {
                    item = _items.pop();
                    _character_count -= item.length;
                    _empty = _items.length === 0;
                }
                return item;
            };

            this.remove_indent = function() {
                if (_indent_count > 0) {
                    _indent_count -= 1;
                    _character_count -= parent.indent_length;
                }
            };

            this.trim = function() {
                while (this.last() === ' ') {
                    _items.pop();
                    _character_count -= 1;
                }
                _empty = _items.length === 0;
            };

            this.toString = function() {
                var result = '';
                if (!this._empty) {
                    if (_indent_count >= 0) {
                        result = parent.indent_cache[_indent_count];
                    }
                    result += _items.join('');
                }
                return result;
            };
        }

        function Output(indent_string, baseIndentString) {
            baseIndentString = baseIndentString || '';
            this.indent_cache = [baseIndentString];
            this.baseIndentLength = baseIndentString.length;
            this.indent_length = indent_string.length;
            this.raw = false;

            var lines = [];
            this.baseIndentString = baseIndentString;
            this.indent_string = indent_string;
            this.previous_line = null;
            this.current_line = null;
            this.space_before_token = false;

            this.add_outputline = function() {
                this.previous_line = this.current_line;
                this.current_line = new OutputLine(this);
                lines.push(this.current_line);
            };

            // initialize
            this.add_outputline();


            this.get_line_number = function() {
                return lines.length;
            };

            // Using object instead of string to allow for later expansion of info about each line
            this.add_new_line = function(force_newline) {
                if (this.get_line_number() === 1 && this.just_added_newline()) {
                    return false; // no newline on start of file
                }

                if (force_newline || !this.just_added_newline()) {
                    if (!this.raw) {
                        this.add_outputline();
                    }
                    return true;
                }

                return false;
            };

            this.get_code = function() {
                var sweet_code = lines.join('\n').replace(/[\r\n\t ]+$/, '');
                return sweet_code;
            };

            this.set_indent = function(level) {
                // Never indent your first output indent at the start of the file
                if (lines.length > 1) {
                    while (level >= this.indent_cache.length) {
                        this.indent_cache.push(this.indent_cache[this.indent_cache.length - 1] + this.indent_string);
                    }

                    this.current_line.set_indent(level);
                    return true;
                }
                this.current_line.set_indent(0);
                return false;
            };

            this.add_raw_token = function(token) {
                for (var x = 0; x < token.newlines; x++) {
                    this.add_outputline();
                }
                this.current_line.push(token.whitespace_before);
                this.current_line.push(token.text);
                this.space_before_token = false;
            };

            this.add_token = function(printable_token) {
                this.add_space_before_token();
                this.current_line.push(printable_token);
            };

            this.add_space_before_token = function() {
                if (this.space_before_token && !this.just_added_newline()) {
                    this.current_line.push(' ');
                }
                this.space_before_token = false;
            };

            this.remove_redundant_indentation = function(frame) {
                // This implementation is effective but has some issues:
                //     - can cause line wrap to happen too soon due to indent removal
                //           after wrap points are calculated
                // These issues are minor compared to ugly indentation.

                if (frame.multiline_frame ||
                    frame.mode === MODE.ForInitializer ||
                    frame.mode === MODE.Conditional) {
                    return;
                }

                // remove one indent from each line inside this section
                var index = frame.start_line_index;

                var output_length = lines.length;
                while (index < output_length) {
                    lines[index].remove_indent();
                    index++;
                }
            };

            this.trim = function(eat_newlines) {
                eat_newlines = (eat_newlines === undefined) ? false : eat_newlines;

                this.current_line.trim(indent_string, baseIndentString);

                while (eat_newlines && lines.length > 1 &&
                this.current_line.is_empty()) {
                    lines.pop();
                    this.current_line = lines[lines.length - 1];
                    this.current_line.trim();
                }

                this.previous_line = lines.length > 1 ? lines[lines.length - 2] : null;
            };

            this.just_added_newline = function() {
                return this.current_line.is_empty();
            };

            this.just_added_blankline = function() {
                if (this.just_added_newline()) {
                    if (lines.length === 1) {
                        return true; // start of the file and newline = blank
                    }

                    var line = lines[lines.length - 2];
                    return line.is_empty();
                }
                return false;
            };
        }

        var InputScanner = function(input) {
            var _input = input;
            var _input_length = _input.length;
            var _position = 0;

            this.back = function() {
                _position -= 1;
            };

            this.hasNext = function() {
                return _position < _input_length;
            };

            this.next = function() {
                var val = null;
                if (this.hasNext()) {
                    val = _input.charAt(_position);
                    _position += 1;
                }
                return val;
            };

            this.peek = function(index) {
                var val = null;
                index = index || 0;
                index += _position;
                if (index >= 0 && index < _input_length) {
                    val = _input.charAt(index);
                }
                return val;
            };

            this.peekCharCode = function(index) {
                var val = 0;
                index = index || 0;
                index += _position;
                if (index >= 0 && index < _input_length) {
                    val = _input.charCodeAt(index);
                }
                return val;
            };

            this.test = function(pattern, index) {
                index = index || 0;
                pattern.lastIndex = _position + index;
                return pattern.test(_input);
            };

            this.testChar = function(pattern, index) {
                var val = this.peek(index);
                return val !== null && pattern.test(val);
            };

            this.match = function(pattern) {
                pattern.lastIndex = _position;
                var pattern_match = pattern.exec(_input);
                if (pattern_match && pattern_match.index === _position) {
                    _position += pattern_match[0].length;
                } else {
                    pattern_match = null;
                }
                return pattern_match;
            };
        };

        var Token = function(type, text, newlines, whitespace_before, parent) {
            this.type = type;
            this.text = text;

            // comments_before are
            // comments that have a new line before them
            // and may or may not have a newline after
            // this is a set of comments before
            this.comments_before = /* inline comment*/ [];


            this.comments_after = []; // no new line before and newline after
            this.newlines = newlines || 0;
            this.wanted_newline = newlines > 0;
            this.whitespace_before = whitespace_before || '';
            this.parent = parent || null;
            this.opened = null;
            this.directives = null;
        };

        function tokenizer(input_string, opts) {

            var whitespace = "\n\r\t ".split('');
            var digit = /[0-9]/;
            var digit_bin = /[01]/;
            var digit_oct = /[01234567]/;
            var digit_hex = /[0123456789abcdefABCDEF]/;

            this.positionable_operators = '!= !== % & && * ** + - / : < << <= == === > >= >> >>> ? ^ | ||'.split(' ');
            var punct = this.positionable_operators.concat(
                // non-positionable operators - these do not follow operator position settings
                '! %= &= *= **= ++ += , -- -= /= :: <<= = => >>= >>>= ^= |= ~ ...'.split(' '));

            // words which should always start on new line.
            this.line_starters = 'continue,try,throw,return,var,let,const,if,switch,case,default,for,while,break,function,import,export'.split(',');
            var reserved_words = this.line_starters.concat(['do', 'in', 'of', 'else', 'get', 'set', 'new', 'catch', 'finally', 'typeof', 'yield', 'async', 'await', 'from', 'as']);

            //  /* ... */ comment ends with nearest */ or end of file
            var block_comment_pattern = /([\s\S]*?)((?:\*\/)|$)/g;

            // comment ends just before nearest linefeed or end of file
            var comment_pattern = /([^\n\r\u2028\u2029]*)/g;

            var directives_block_pattern = /\/\* beautify( \w+[:]\w+)+ \*\//g;
            var directive_pattern = / (\w+)[:](\w+)/g;
            var directives_end_ignore_pattern = /([\s\S]*?)((?:\/\*\sbeautify\signore:end\s\*\/)|$)/g;

            var template_pattern = /((<\?php|<\?=)[\s\S]*?\?>)|(<%[\s\S]*?%>)/g;

            var n_newlines, whitespace_before_token, in_html_comment, tokens;
            var input;

            this.tokenize = function() {
                input = new InputScanner(input_string);
                in_html_comment = false;
                tokens = [];

                var next, last;
                var token_values;
                var open = null;
                var open_stack = [];
                var comments = [];

                while (!(last && last.type === 'TK_EOF')) {
                    token_values = tokenize_next();
                    next = new Token(token_values[1], token_values[0], n_newlines, whitespace_before_token);
                    while (next.type === 'TK_COMMENT' || next.type === 'TK_BLOCK_COMMENT' || next.type === 'TK_UNKNOWN') {
                        if (next.type === 'TK_BLOCK_COMMENT') {
                            next.directives = token_values[2];
                        }
                        comments.push(next);
                        token_values = tokenize_next();
                        next = new Token(token_values[1], token_values[0], n_newlines, whitespace_before_token);
                    }

                    if (comments.length) {
                        next.comments_before = comments;
                        comments = [];
                    }

                    if (next.type === 'TK_START_BLOCK' || next.type === 'TK_START_EXPR') {
                        next.parent = last;
                        open_stack.push(open);
                        open = next;
                    } else if ((next.type === 'TK_END_BLOCK' || next.type === 'TK_END_EXPR') &&
                        (open && (
                        (next.text === ']' && open.text === '[') ||
                        (next.text === ')' && open.text === '(') ||
                        (next.text === '}' && open.text === '{')))) {
                        next.parent = open.parent;
                        next.opened = open;

                        open = open_stack.pop();
                    }

                    tokens.push(next);
                    last = next;
                }

                return tokens;
            };

            function get_directives(text) {
                if (!text.match(directives_block_pattern)) {
                    return null;
                }

                var directives = {};
                directive_pattern.lastIndex = 0;
                var directive_match = directive_pattern.exec(text);

                while (directive_match) {
                    directives[directive_match[1]] = directive_match[2];
                    directive_match = directive_pattern.exec(text);
                }

                return directives;
            }

            function tokenize_next() {
                var resulting_string;
                var whitespace_on_this_line = [];

                n_newlines = 0;
                whitespace_before_token = '';

                var c = input.next();

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

                var last_token;
                if (tokens.length) {
                    last_token = tokens[tokens.length - 1];
                } else {
                    // For the sake of tokenizing we can pretend that there was on open brace to start
                    last_token = new Token('TK_START_BLOCK', '{');
                }

                while (in_array(c, whitespace)) {

                    if (acorn.newline.test(c)) {
                        if (!(c === '\n' && input.peek(-2) === '\r')) {
                            n_newlines += 1;
                            whitespace_on_this_line = [];
                        }
                    } else {
                        whitespace_on_this_line.push(c);
                    }

                    c = input.next();

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

                if (whitespace_on_this_line.length) {
                    whitespace_before_token = whitespace_on_this_line.join('');
                }

                if (digit.test(c) || (c === '.' && input.testChar(digit))) {
                    var allow_decimal = true;
                    var allow_e = true;
                    var local_digit = digit;

                    if (c === '0' && input.testChar(/[XxOoBb]/)) {
                        // switch to hex/oct/bin number, no decimal or e, just hex/oct/bin digits
                        allow_decimal = false;
                        allow_e = false;
                        if (input.testChar(/[Bb]/)) {
                            local_digit = digit_bin;
                        } else if (input.testChar(/[Oo]/)) {
                            local_digit = digit_oct;
                        } else {
                            local_digit = digit_hex;
                        }
                        c += input.next();
                    } else if (c === '.') {
                        // Already have a decimal for this literal, don't allow another
                        allow_decimal = false;
                    } else {
                        // we know this first loop will run.  It keeps the logic simpler.
                        c = '';
                        input.back();
                    }

                    // Add the digits
                    while (input.testChar(local_digit)) {
                        c += input.next();

                        if (allow_decimal && input.peek() === '.') {
                            c += input.next();
                            allow_decimal = false;
                        }

                        // a = 1.e-7 is valid, so we test for . then e in one loop
                        if (allow_e && input.testChar(/[Ee]/)) {
                            c += input.next();

                            if (input.testChar(/[+-]/)) {
                                c += input.next();
                            }

                            allow_e = false;
                            allow_decimal = false;
                        }
                    }

                    return [c, 'TK_WORD'];
                }

                if (acorn.isIdentifierStart(input.peekCharCode(-1))) {
                    if (input.hasNext()) {
                        while (acorn.isIdentifierChar(input.peekCharCode())) {
                            c += input.next();
                            if (!input.hasNext()) {
                                break;
                            }
                        }
                    }

                    if (!(last_token.type === 'TK_DOT' ||
                        (last_token.type === 'TK_RESERVED' && in_array(last_token.text, ['set', 'get']))) &&
                        in_array(c, reserved_words)) {
                        if (c === 'in' || c === 'of') { // hack for 'in' and 'of' operators
                            return [c, 'TK_OPERATOR'];
                        }
                        return [c, 'TK_RESERVED'];
                    }

                    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 = '';
                    var comment_match;
                    // peek for comment /* ... */
                    if (input.peek() === '*') {
                        input.next();
                        comment_match = input.match(block_comment_pattern);
                        comment = '/*' + comment_match[0];
                        var directives = get_directives(comment);
                        if (directives && directives.ignore === 'start') {
                            comment_match = input.match(directives_end_ignore_pattern);
                            comment += comment_match[0];
                        }
                        comment = comment.replace(acorn.allLineBreaks, '\n');
                        return [comment, 'TK_BLOCK_COMMENT', directives];
                    }
                    // peek for comment // ...
                    if (input.peek() === '/') {
                        input.next();
                        comment_match = input.match(comment_pattern);
                        comment = '//' + comment_match[0];
                        return [comment, 'TK_COMMENT'];
                    }

                }

                var startXmlRegExp = /<()([-a-zA-Z:0-9_.]+|{[\s\S]+?}|!\[CDATA\[[\s\S]*?\]\])(\s+{[\s\S]+?}|\s+[-a-zA-Z:0-9_.]+|\s+[-a-zA-Z:0-9_.]+\s*=\s*('[^']*'|"[^"]*"|{[\s\S]+?}))*\s*(\/?)\s*>/g;

                if (c === '`' || c === "'" || c === '"' || // string
                    (
                        (c === '/') || // regexp
                        (opts.e4x && c === "<" && input.test(startXmlRegExp, -1)) // xml
                    ) && ( // regex and xml can only appear in specific locations during parsing
                        (last_token.type === 'TK_RESERVED' && in_array(last_token.text, ['return', 'case', 'throw', 'else', 'do', 'typeof', 'yield'])) ||
                        (last_token.type === 'TK_END_EXPR' && last_token.text === ')' &&
                        last_token.parent && last_token.parent.type === 'TK_RESERVED' && in_array(last_token.parent.text, ['if', 'while', 'for'])) ||
                        (in_array(last_token.type, ['TK_COMMENT', 'TK_START_EXPR', 'TK_START_BLOCK',
                            'TK_END_BLOCK', 'TK_OPERATOR', 'TK_EQUALS', 'TK_EOF', 'TK_SEMICOLON', 'TK_COMMA'
                        ]))
                    )) {

                    var sep = c,
                        esc = false,
                        has_char_escapes = false;

                    resulting_string = c;

                    if (sep === '/') {
                        //
                        // handle regexp
                        //
                        var in_char_class = false;
                        while (input.hasNext() &&
                        ((esc || in_char_class || input.peek() !== sep) &&
                        !input.testChar(acorn.newline))) {
                            resulting_string += input.peek();
                            if (!esc) {
                                esc = input.peek() === '\\';
                                if (input.peek() === '[') {
                                    in_char_class = true;
                                } else if (input.peek() === ']') {
                                    in_char_class = false;
                                }
                            } else {
                                esc = false;
                            }
                            input.next();
                        }
                    } else if (opts.e4x && sep === '<') {
                        //
                        // handle e4x xml literals
                        //

                        var xmlRegExp = /[\s\S]*?<(\/?)([-a-zA-Z:0-9_.]+|{[\s\S]+?}|!\[CDATA\[[\s\S]*?\]\])(\s+{[\s\S]+?}|\s+[-a-zA-Z:0-9_.]+|\s+[-a-zA-Z:0-9_.]+\s*=\s*('[^']*'|"[^"]*"|{[\s\S]+?}))*\s*(\/?)\s*>/g;
                        input.back();
                        var xmlStr = '';
                        var match = input.match(startXmlRegExp);
                        if (match) {
                            // Trim root tag to attempt to
                            var rootTag = match[2].replace(/^{\s+/, '{').replace(/\s+}$/, '}');
                            var isCurlyRoot = rootTag.indexOf('{') === 0;
                            var depth = 0;
                            while (match) {
                                var isEndTag = !!match[1];
                                var tagName = match[2];
                                var isSingletonTag = (!!match[match.length - 1]) || (tagName.slice(0, 8) === "![CDATA[");
                                if (!isSingletonTag &&
                                    (tagName === rootTag || (isCurlyRoot && tagName.replace(/^{\s+/, '{').replace(/\s+}$/, '}')))) {
                                    if (isEndTag) {
                                        --depth;
                                    } else {
                                        ++depth;
                                    }
                                }
                                xmlStr += match[0];
                                if (depth <= 0) {
                                    break;
                                }
                                match = input.match(xmlRegExp);
                            }
                            // if we didn't close correctly, keep unformatted.
                            if (!match) {
                                xmlStr += input.match(/[\s\S]*/g)[0];
                            }
                            xmlStr = xmlStr.replace(acorn.allLineBreaks, '\n');
                            return [xmlStr, "TK_STRING"];
                        }
                    } else {
                        //
                        // handle string
                        //
                        var parse_string = function(delimiter, allow_unescaped_newlines, start_sub) {
                            // Template strings can travers lines without escape characters.
                            // Other strings cannot
                            var current_char;
                            while (input.hasNext()) {
                                current_char = input.peek();
                                if (!(esc || (current_char !== delimiter &&
                                    (allow_unescaped_newlines || !acorn.newline.test(current_char))))) {
                                    break;
                                }

                                // Handle \r\n linebreaks after escapes or in template strings
                                if ((esc || allow_unescaped_newlines) && acorn.newline.test(current_char)) {
                                    if (current_char === '\r' && input.peek(1) === '\n') {
                                        input.next();
                                        current_char = input.peek();
                                    }
                                    resulting_string += '\n';
                                } else {
                                    resulting_string += current_char;
                                }

                                if (esc) {
                                    if (current_char === 'x' || current_char === 'u') {
                                        has_char_escapes = true;
                                    }
                                    esc = false;
                                } else {
                                    esc = current_char === '\\';
                                }

                                input.next();

                                if (start_sub && resulting_string.indexOf(start_sub, resulting_string.length - start_sub.length) !== -1) {
                                    if (delimiter === '`') {
                                        parse_string('}', allow_unescaped_newlines, '`');
                                    } else {
                                        parse_string('`', allow_unescaped_newlines, '${');
                                    }

                                    if (input.hasNext()) {
                                        resulting_string += input.next();
                                    }
                                }
                            }
                        };

                        if (sep === '`') {
                            parse_string('`', true, '${');
                        } else {
                            parse_string(sep);
                        }
                    }

                    if (has_char_escapes && opts.unescape_strings) {
                        resulting_string = unescape_string(resulting_string);
                    }

                    if (input.peek() === sep) {
                        resulting_string += sep;
                        input.next();

                        if (sep === '/') {
                            // regexps may have modifiers /regexp/MOD , so fetch those, too
                            // Only [gim] are valid, but if the user puts in garbage, do what we can to take it.
                            while (input.hasNext() && acorn.isIdentifierStart(input.peekCharCode())) {
                                resulting_string += input.next();
                            }
                        }
                    }
                    return [resulting_string, 'TK_STRING'];
                }

                if (c === '#') {

                    if (tokens.length === 0 && input.peek() === '!') {
                        // shebang
                        resulting_string = c;
                        while (input.hasNext() && c !== '\n') {
                            c = input.next();
                            resulting_string += c;
                        }
                        return [trim(resulting_string) + '\n', 'TK_UNKNOWN'];
                    }



                    // 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 (input.hasNext() && input.testChar(digit)) {
                        do {
                            c = input.next();
                            sharp += c;
                        } while (input.hasNext() && c !== '#' && c !== '=');
                        if (c === '#') {
                            //
                        } else if (input.peek() === '[' && input.peek(1) === ']') {
                            sharp += '[]';
                            input.next();
                            input.next();
                        } else if (input.peek() === '{' && input.peek(1) === '}') {
                            sharp += '{}';
                            input.next();
                            input.next();
                        }
                        return [sharp, 'TK_WORD'];
                    }
                }

                if (c === '<' && (input.peek() === '?' || input.peek() === '%')) {
                    input.back();
                    var template_match = input.match(template_pattern);
                    if (template_match) {
                        c = template_match[0];
                        c = c.replace(acorn.allLineBreaks, '\n');
                        return [c, 'TK_STRING'];
                    }
                }

                if (c === '<' && input.match(/\!--/g)) {
                    c = '<!--';
                    while (input.hasNext() && !input.testChar(acorn.newline)) {
                        c += input.next();
                    }
                    in_html_comment = true;
                    return [c, 'TK_COMMENT'];
                }

                if (c === '-' && in_html_comment && input.match(/->/g)) {
                    in_html_comment = false;
                    return ['-->', 'TK_COMMENT'];
                }

                if (c === '.') {
                    if (input.peek() === '.' && input.peek(1) === '.') {
                        c += input.next() + input.next();
                        return [c, 'TK_OPERATOR'];
                    }
                    return [c, 'TK_DOT'];
                }

                if (in_array(c, punct)) {
                    while (input.hasNext() && in_array(c + input.peek(), punct)) {
                        c += input.next();
                        if (!input.hasNext()) {
                            break;
                        }
                    }

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

                return [c, 'TK_UNKNOWN'];
            }


            function unescape_string(s) {
                // You think that a regex would work for this
                // return s.replace(/\\x([0-9a-f]{2})/gi, function(match, val) {
                //         return String.fromCharCode(parseInt(val, 16));
                //     })
                // However, dealing with '\xff', '\\xff', '\\\xff' makes this more fun.
                var out = '',
                    escaped = 0;

                var input_scan = new InputScanner(s);
                var matched = null;

                while (input_scan.hasNext()) {
                    // Keep any whitespace, non-slash characters
                    // also keep slash pairs.
                    matched = input_scan.match(/([\s]|[^\\]|\\\\)+/g);

                    if (matched) {
                        out += matched[0];
                    }

                    if (input_scan.peek() === '\\') {
                        input_scan.next();
                        if (input_scan.peek() === 'x') {
                            matched = input_scan.match(/x([0-9A-Fa-f]{2})/g);
                        } else if (input_scan.peek() === 'u') {
                            matched = input_scan.match(/u([0-9A-Fa-f]{4})/g);
                        } else {
                            out += '\\';
                            if (input_scan.hasNext()) {
                                out += input_scan.next();
                            }
                            continue;
                        }

                        // If there's some error decoding, return the original string
                        if (!matched) {
                            return s;
                        }

                        escaped = parseInt(matched[1], 16);

                        if (escaped > 0x7e && escaped <= 0xff && matched[0].indexOf('x') === 0) {
                            // we bail out on \x7f..\xff,
                            // leaving whole string escaped,
                            // as it's probably completely binary
                            return s;
                        } else if (escaped >= 0x00 && escaped < 0x20) {
                            // leave 0x00...0x1f escaped
                            out += '\\' + matched[0];
                            continue;
                        } else if (escaped === 0x22 || escaped === 0x27 || escaped === 0x5c) {
                            // single-quote, apostrophe, backslash - escape these
                            out += '\\' + String.fromCharCode(escaped);
                        } else {
                            out += String.fromCharCode(escaped);
                        }
                    }
                }

                return out;
            }
        }

        var beautifier = new Beautifier(js_source_text, options);
        return beautifier.beautify();

    }

    if (typeof define === "function" && define.amd) {
        // Add support for AMD ( https://github.com/amdjs/amdjs-api/wiki/AMD#defineamd-property- )
        define([], function() {
            return { js_beautify: js_beautify };
        });
    } else if (typeof exports !== "undefined") {
        // 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`.
        exports.js_beautify = js_beautify;
    } else if (typeof window !== "undefined") {
        // If we're running a web page and don't have either of the above, add our one global
        window.js_beautify = js_beautify;
    } else if (typeof global !== "undefined") {
        // If we don't even have window, try global.
        global.js_beautify = js_beautify;
    }

}());