The Tor Browser: browser/devtools/shared/Jsbeautify.jsm@6474c204b198 (annotated)

browser/devtools/shared/Jsbeautify.jsm@6474c204b198 (annotated)

browser/devtools/shared/Jsbeautify.jsm

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*jslint onevar: false, plusplus: false */
 /*jshint curly:true, eqeqeq:true, laxbreak:true, noempty:false */
 /*
  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>
   You are free to use this in any way you want, in case you find this useful or working for you.
   Usage:
     js_beautify(js_source_text);
     js_beautify(js_source_text, options);
   The options are:
     indent_size (default 4)          - indentation size,
     indent_char (default space)      - character to indent with,
     preserve_newlines (default true) - whether existing line breaks should be preserved,
     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()
     brace_style (default "collapse") - "collapse" | "expand" | "end-expand" | "expand-strict"
             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.
             expand-strict: put brace on own line even in such cases:
                 var a =
                 {
                     a: 5,
                     b: 6
                 }
             This mode may break your scripts - e.g "return { a: 1 }" will be broken into two lines, so beware.
     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"
     e.g
     js_beautify(js_source_text, {
       'indent_size': 1,
       'indent_char': '\t'
     });
 */
 this.EXPORTED_SYMBOLS = ["js_beautify"];
 this.js_beautify = function js_beautify(js_source_text, options) {
     var input, output, token_text, last_type, last_text, last_last_text, last_word, flags, flag_store, indent_string;
     var whitespace, wordchar, punct, parser_pos, line_starters, digits;
     var prefix, token_type, do_block_just_closed;
     var wanted_newline, just_added_newline, n_newlines;
     var preindent_string = '';
     // Some interpreters have unexpected results with foo = baz || bar;
     options = options ? options : {};
     var opt_brace_style;
     // compatibility
     if (options.space_after_anon_function !== undefined && options.jslint_happy === undefined) {
         options.jslint_happy = options.space_after_anon_function;
     }
     if (options.braces_on_own_line !== undefined) { //graceful handling of deprecated option
         opt_brace_style = options.braces_on_own_line ? "expand" : "collapse";
     }
     opt_brace_style = options.brace_style ? options.brace_style : (opt_brace_style ? opt_brace_style : "collapse");
     var opt_indent_size = options.indent_size ? options.indent_size : 4;
     var opt_indent_char = options.indent_char ? options.indent_char : ' ';
     var opt_preserve_newlines = typeof options.preserve_newlines === 'undefined' ? true : options.preserve_newlines;
     var opt_max_preserve_newlines = typeof options.max_preserve_newlines === 'undefined' ? false : options.max_preserve_newlines;
     var opt_jslint_happy = options.jslint_happy === 'undefined' ? false : options.jslint_happy;
     var opt_keep_array_indentation = typeof options.keep_array_indentation === 'undefined' ? false : options.keep_array_indentation;
     var opt_space_before_conditional = typeof options.space_before_conditional === 'undefined' ? true : options.space_before_conditional;
     var opt_indent_case = typeof options.indent_case === 'undefined' ? false : options.indent_case;
     var opt_unescape_strings = typeof options.unescape_strings === 'undefined' ? false : options.unescape_strings;
     just_added_newline = false;
     // cache the source's length.
     var input_length = js_source_text.length;
     function trim_output(eat_newlines) {
         eat_newlines = typeof eat_newlines === 'undefined' ? false : eat_newlines;
         while (output.length && (output[output.length - 1] === ' '
             || output[output.length - 1] === indent_string
             || output[output.length - 1] === preindent_string
             || (eat_newlines && (output[output.length - 1] === '\n' || output[output.length - 1] === '\r')))) {
             output.pop();
         }
     }
     function trim(s) {
         return s.replace(/^\s\s*|\s\s*$/, '');
     }
     // we could use just string.split, but
     // IE doesn't like returning empty strings
     function split_newlines(s) {
         return s.split(/\x0d\x0a|\x0a/);
     }
     function force_newline() {
         var old_keep_array_indentation = opt_keep_array_indentation;
         opt_keep_array_indentation = false;
         print_newline();
         opt_keep_array_indentation = old_keep_array_indentation;
     }
     function print_newline(ignore_repeated) {
         flags.eat_next_space = false;
         if (opt_keep_array_indentation && is_array(flags.mode)) {
             return;
         }
         ignore_repeated = typeof ignore_repeated === 'undefined' ? true : ignore_repeated;
         flags.if_line = false;
         trim_output();
         if (!output.length) {
             return; // no newline on start of file
         }
         if (output[output.length - 1] !== "\n" || !ignore_repeated) {
             just_added_newline = true;
             output.push("\n");
         }
         if (preindent_string) {
             output.push(preindent_string);
         }
         for (var i = 0; i < flags.indentation_level; i += 1) {
             output.push(indent_string);
         }
         if (flags.var_line && flags.var_line_reindented) {
             output.push(indent_string); // skip space-stuffing, if indenting with a tab
         }
         if (flags.case_body) {
             output.push(indent_string);
         }
     }
     function print_single_space() {
         if (last_type === 'TK_COMMENT') {
             return print_newline();
         }
         if (flags.eat_next_space) {
             flags.eat_next_space = false;
             return;
         }
         var last_output = ' ';
         if (output.length) {
             last_output = output[output.length - 1];
         }
         if (last_output !== ' ' && last_output !== '\n' && last_output !== indent_string) { // prevent occassional duplicate space
             output.push(' ');
         }
     }
     function print_token() {
         just_added_newline = false;
         flags.eat_next_space = false;
         output.push(token_text);
     }
     function indent() {
         flags.indentation_level += 1;
     }
     function remove_indent() {
         if (output.length && output[output.length - 1] === indent_string) {
             output.pop();
         }
     }
     function set_mode(mode) {
         if (flags) {
             flag_store.push(flags);
         }
         flags = {
             previous_mode: flags ? flags.mode : 'BLOCK',
             mode: mode,
             var_line: false,
             var_line_tainted: false,
             var_line_reindented: false,
             in_html_comment: false,
             if_line: false,
             in_case_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
             eat_next_space: false,
             indentation_baseline: -1,
             indentation_level: (flags ? flags.indentation_level + (flags.case_body ? 1 : 0) + ((flags.var_line && flags.var_line_reindented) ? 1 : 0) : 0),
             ternary_depth: 0
         };
     }
     function is_array(mode) {
         return mode === '[EXPRESSION]' || mode === '[INDENTED-EXPRESSION]';
     }
     function is_expression(mode) {
         return in_array(mode, ['[EXPRESSION]', '(EXPRESSION)', '(FOR-EXPRESSION)', '(COND-EXPRESSION)']);
     }
     function restore_mode() {
         do_block_just_closed = flags.mode === 'DO_BLOCK';
         if (flag_store.length > 0) {
             var mode = flags.mode;
             flags = flag_store.pop();
             flags.previous_mode = mode;
         }
     }
     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 is_special_word(word) {
         return in_array(word, ['case', 'return', 'do', 'if', 'throw', 'else']);
     }
     function in_array(what, arr) {
         for (var i = 0; i < arr.length; i += 1) {
             if (arr[i] === what) {
                 return true;
             }
         }
         return false;
     }
     function look_up(exclude) {
         var local_pos = parser_pos;
         var c = input.charAt(local_pos);
         while (in_array(c, whitespace) && c !== exclude) {
             local_pos++;
             if (local_pos >= input_length) {
                 return 0;
             }
             c = input.charAt(local_pos);
         }
         return c;
     }
     function get_next_token() {
         var i;
         var resulting_string;
         n_newlines = 0;
         if (parser_pos >= input_length) {
             return ['', 'TK_EOF'];
         }
         wanted_newline = false;
         var c = input.charAt(parser_pos);
         parser_pos += 1;
         var keep_whitespace = opt_keep_array_indentation && is_array(flags.mode);
         if (keep_whitespace) {
             //
             // slight mess to allow nice preservation of array indentation and reindent that correctly
             // first time when we get to the arrays:
             // var a = [
             // ....'something'
             // we make note of whitespace_count = 4 into flags.indentation_baseline
             // so we know that 4 whitespaces in original source match indent_level of reindented source
             //
             // and afterwards, when we get to
             //    'something,
             // .......'something else'
             // we know that this should be indented to indent_level + (7 - indentation_baseline) spaces
             //
             var whitespace_count = 0;
             while (in_array(c, whitespace)) {
                 if (c === "\n") {
                     trim_output();
                     output.push("\n");
                     just_added_newline = true;
                     whitespace_count = 0;
                 } else {
                     if (c === '\t') {
                         whitespace_count += 4;
                     } else if (c === '\r') {
                         // nothing
                     } else {
                         whitespace_count += 1;
                     }
                 }
                 if (parser_pos >= input_length) {
                     return ['', 'TK_EOF'];
                 }
                 c = input.charAt(parser_pos);
                 parser_pos += 1;
             }
             if (flags.indentation_baseline === -1) {
                 flags.indentation_baseline = whitespace_count;
             }
             if (just_added_newline) {
                 for (i = 0; i < flags.indentation_level + 1; i += 1) {
                     output.push(indent_string);
                 }
                 if (flags.indentation_baseline !== -1) {
                     for (i = 0; i < whitespace_count - flags.indentation_baseline; i++) {
                         output.push(' ');
                     }
                 }
             }
         } else {
             while (in_array(c, whitespace)) {
                 if (c === "\n") {
                     n_newlines += ((opt_max_preserve_newlines) ? (n_newlines <= opt_max_preserve_newlines) ? 1 : 0 : 1);
                 }
                 if (parser_pos >= input_length) {
                     return ['', 'TK_EOF'];
                 }
                 c = input.charAt(parser_pos);
                 parser_pos += 1;
             }
             if (opt_preserve_newlines) {
                 if (n_newlines > 1) {
                     for (i = 0; i < n_newlines; i += 1) {
                         print_newline(i === 0);
                         just_added_newline = true;
                     }
                 }
             }
             wanted_newline = n_newlines > 0;
         }
         if (in_array(c, wordchar)) {
             if (parser_pos < input_length) {
                 while (in_array(input.charAt(parser_pos), wordchar)) {
                     c += input.charAt(parser_pos);
                     parser_pos += 1;
                     if (parser_pos === input_length) {
                         break;
                     }
                 }
             }
             // small and surprisingly unugly hack for 1E-10 representation
             if (parser_pos !== input_length && c.match(/^[0-9]+[Ee]$/) && (input.charAt(parser_pos) === '-' || input.charAt(parser_pos) === '+')) {
                 var sign = input.charAt(parser_pos);
                 parser_pos += 1;
                 var t = get_next_token();
                 c += sign + t[0];
                 return [c, 'TK_WORD'];
             }
             if (c === 'in') { // hack for 'in' operator
                 return [c, 'TK_OPERATOR'];
             }
             if (wanted_newline && last_type !== 'TK_OPERATOR'
                 && last_type !== 'TK_EQUALS'
                 && !flags.if_line && (opt_preserve_newlines || last_text !== 'var')) {
                 print_newline();
             }
             return [c, 'TK_WORD'];
         }
         if (c === '(' || c === '[') {
             return [c, 'TK_START_EXPR'];
         }
         if (c === ')' || c === ']') {
             return [c, 'TK_END_EXPR'];
         }
         if (c === '{') {
             return [c, 'TK_START_BLOCK'];
         }
         if (c === '}') {
             return [c, 'TK_END_BLOCK'];
         }
         if (c === ';') {
             return [c, 'TK_SEMICOLON'];
         }
         if (c === '/') {
             var comment = '';
             // peek for comment /* ... */
             var inline_comment = true;
             if (input.charAt(parser_pos) === '*') {
                 parser_pos += 1;
                 if (parser_pos < input_length) {
                     while (parser_pos < input_length &&
                         ! (input.charAt(parser_pos) === '*' && input.charAt(parser_pos + 1) && input.charAt(parser_pos + 1) === '/')) {
                         c = input.charAt(parser_pos);
                         comment += c;
                         if (c === "\n" || c === "\r") {
                             inline_comment = false;
                         }
                         parser_pos += 1;
                         if (parser_pos >= input_length) {
                             break;
                         }
                     }
                 }
                 parser_pos += 2;
                 if (inline_comment && n_newlines === 0) {
                     return ['/*' + comment + '*/', 'TK_INLINE_COMMENT'];
                 } else {
                     return ['/*' + comment + '*/', 'TK_BLOCK_COMMENT'];
                 }
             }
             // peek for comment // ...
             if (input.charAt(parser_pos) === '/') {
                 comment = c;
                 while (input.charAt(parser_pos) !== '\r' && input.charAt(parser_pos) !== '\n') {
                     comment += input.charAt(parser_pos);
                     parser_pos += 1;
                     if (parser_pos >= input_length) {
                         break;
                     }
                 }
                 if (wanted_newline) {
                     print_newline();
                 }
                 return [comment, 'TK_COMMENT'];
             }
         }
         if (c === "'" || // string
         c === '"' || // string
         (c === '/' &&
             ((last_type === 'TK_WORD' && is_special_word(last_text)) ||
                 (last_text === ')' && in_array(flags.previous_mode, ['(COND-EXPRESSION)', '(FOR-EXPRESSION)'])) ||
                 (last_type === 'TK_COMMA' || last_type === 'TK_COMMENT' || last_type === 'TK_START_EXPR' || last_type === 'TK_START_BLOCK' || last_type === 'TK_END_BLOCK' || last_type === 'TK_OPERATOR' || last_type === 'TK_EQUALS' || last_type === 'TK_EOF' || last_type === 'TK_SEMICOLON')))) { // regexp
             var sep = c;
             var esc = false;
             var esc1 = 0;
             var esc2 = 0;
             resulting_string = c;
             if (parser_pos < input_length) {
                 if (sep === '/') {
                     //
                     // handle regexp separately...
                     //
                     var in_char_class = false;
                     while (esc || in_char_class || input.charAt(parser_pos) !== sep) {
                         resulting_string += input.charAt(parser_pos);
                         if (!esc) {
                             esc = input.charAt(parser_pos) === '\\';
                             if (input.charAt(parser_pos) === '[') {
                                 in_char_class = true;
                             } else if (input.charAt(parser_pos) === ']') {
                                 in_char_class = false;
                             }
                         } else {
                             esc = false;
                         }
                         parser_pos += 1;
                         if (parser_pos >= input_length) {
                             // incomplete string/rexp when end-of-file reached.
                             // bail out with what had been received so far.
                             return [resulting_string, 'TK_STRING'];
                         }
                     }
                 } else {
                     //
                     // and handle string also separately
                     //
                     while (esc || input.charAt(parser_pos) !== sep) {
                         resulting_string += input.charAt(parser_pos);
                         if (esc1 && esc1 >= esc2) {
                             esc1 = parseInt(resulting_string.substr(-esc2), 16);
                             if (esc1 && esc1 >= 0x20 && esc1 <= 0x7e) {
                                 esc1 = String.fromCharCode(esc1);
                                 resulting_string = resulting_string.substr(0, resulting_string.length - esc2 - 2) + (((esc1 === sep) || (esc1 === '\\')) ? '\\' : '') + esc1;
                             }
                             esc1 = 0;
                         }
                         if (esc1) {
                             esc1++;
                         } else if (!esc) {
                             esc = input.charAt(parser_pos) === '\\';
                         } else {
                             esc = false;
                             if (opt_unescape_strings) {
                                 if (input.charAt(parser_pos) === 'x') {
                                     esc1++;
                                     esc2 = 2;
                                 } else if (input.charAt(parser_pos) === 'u') {
                                     esc1++;
                                     esc2 = 4;
                                 }
                             }
                         }
                         parser_pos += 1;
                         if (parser_pos >= input_length) {
                             // incomplete string/rexp when end-of-file reached.
                             // bail out with what had been received so far.
                             return [resulting_string, 'TK_STRING'];
                         }
                     }
                 }
             }
             parser_pos += 1;
             resulting_string += sep;
             if (sep === '/') {
                 // regexps may have modifiers /regexp/MOD , so fetch those, too
                 while (parser_pos < input_length && in_array(input.charAt(parser_pos), wordchar)) {
                     resulting_string += input.charAt(parser_pos);
                     parser_pos += 1;
                 }
             }
             return [resulting_string, 'TK_STRING'];
         }
         if (c === '#') {
             if (output.length === 0 && input.charAt(parser_pos) === '!') {
                 // shebang
                 resulting_string = c;
                 while (parser_pos < input_length && c !== '\n') {
                     c = input.charAt(parser_pos);
                     resulting_string += c;
                     parser_pos += 1;
                 }
                 output.push(trim(resulting_string) + '\n');
                 print_newline();
                 return get_next_token();
             }
             // Spidermonkey-specific sharp variables for circular references
             // https://developer.mozilla.org/En/Sharp_variables_in_JavaScript
             // http://mxr.mozilla.org/mozilla-central/source/js/src/jsscan.cpp around line 1935
             var sharp = '#';
             if (parser_pos < input_length && in_array(input.charAt(parser_pos), digits)) {
                 do {
                     c = input.charAt(parser_pos);
                     sharp += c;
                     parser_pos += 1;
                 } while (parser_pos < input_length && c !== '#' && c !== '=');
                 if (c === '#') {
                     //
                 } else if (input.charAt(parser_pos) === '[' && input.charAt(parser_pos + 1) === ']') {
                     sharp += '[]';
                     parser_pos += 2;
                 } else if (input.charAt(parser_pos) === '{' && input.charAt(parser_pos + 1) === '}') {
                     sharp += '{}';
                     parser_pos += 2;
                 }
                 return [sharp, 'TK_WORD'];
             }
         }
         if (c === '<' && input.substring(parser_pos - 1, parser_pos + 3) === '<!--') {
             parser_pos += 3;
             c = '<!--';
             while (input.charAt(parser_pos) !== '\n' && parser_pos < input_length) {
                 c += input.charAt(parser_pos);
                 parser_pos++;
             }
             flags.in_html_comment = true;
             return [c, 'TK_COMMENT'];
         }
         if (c === '-' && flags.in_html_comment && input.substring(parser_pos - 1, parser_pos + 2) === '-->') {
             flags.in_html_comment = false;
             parser_pos += 2;
             if (wanted_newline) {
                 print_newline();
             }
             return ['-->', 'TK_COMMENT'];
         }
         if (in_array(c, punct)) {
             while (parser_pos < input_length && in_array(c + input.charAt(parser_pos), punct)) {
                 c += input.charAt(parser_pos);
                 parser_pos += 1;
                 if (parser_pos >= input_length) {
                     break;
                 }
             }
             if (c === ',') {
                 return [c, 'TK_COMMA'];
             } else if (c === '=') {
                 return [c, 'TK_EQUALS'];
             } else {
                 return [c, 'TK_OPERATOR'];
             }
         }
         return [c, 'TK_UNKNOWN'];
     }
     //----------------------------------
     indent_string = '';
     while (opt_indent_size > 0) {
         indent_string += opt_indent_char;
         opt_indent_size -= 1;
     }
     while (js_source_text && (js_source_text.charAt(0) === ' ' || js_source_text.charAt(0) === '\t')) {
         preindent_string += js_source_text.charAt(0);
         js_source_text = js_source_text.substring(1);
     }
     input = js_source_text;
     last_word = ''; // last 'TK_WORD' passed
     last_type = 'TK_START_EXPR'; // last token type
     last_text = ''; // last token text
     last_last_text = ''; // pre-last token text
     output = [];
     do_block_just_closed = false;
     whitespace = "\n\r\t ".split('');
     wordchar = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_$'.split('');
     digits = '0123456789'.split('');
     punct = '+ - * / % & ++ -- = += -= *= /= %= == === != !== > < >= <= >> << >>> >>>= >>= <<= && &= | || ! !! , : ? ^ ^= |= ::';
     punct += ' <%= <% %> <?= <? ?>'; // try to be a good boy and try not to break the markup language identifiers
     punct = punct.split(' ');
     // words which should always start on new line.
     line_starters = 'continue,try,throw,return,var,if,switch,case,default,for,while,break,function'.split(',');
     // states showing if we are currently in expression (i.e. "if" case) - 'EXPRESSION', or in usual block (like, procedure), 'BLOCK'.
     // some formatting depends on that.
     flag_store = [];
     set_mode('BLOCK');
     parser_pos = 0;
     while (true) {
         var t = get_next_token();
         token_text = t[0];
         token_type = t[1];
         if (token_type === 'TK_EOF') {
             break;
         }
         switch (token_type) {
         case 'TK_START_EXPR':
             if (token_text === '[') {
                 if (last_type === 'TK_WORD' || last_text === ')') {
                     // this is array index specifier, break immediately
                     // a[x], fn()[x]
                     if (in_array(last_text, line_starters)) {
                         print_single_space();
                     }
                     set_mode('(EXPRESSION)');
                     print_token();
                     break;
                 }
                 if (flags.mode === '[EXPRESSION]' || flags.mode === '[INDENTED-EXPRESSION]') {
                     if (last_last_text === ']' && last_text === ',') {
                         // ], [ goes to new line
                         if (flags.mode === '[EXPRESSION]') {
                             flags.mode = '[INDENTED-EXPRESSION]';
                             if (!opt_keep_array_indentation) {
                                 indent();
                             }
                         }
                         set_mode('[EXPRESSION]');
                         if (!opt_keep_array_indentation) {
                             print_newline();
                         }
                     } else if (last_text === '[') {
                         if (flags.mode === '[EXPRESSION]') {
                             flags.mode = '[INDENTED-EXPRESSION]';
                             if (!opt_keep_array_indentation) {
                                 indent();
                             }
                         }
                         set_mode('[EXPRESSION]');
                         if (!opt_keep_array_indentation) {
                             print_newline();
                         }
                     } else {
                         set_mode('[EXPRESSION]');
                     }
                 } else {
                     set_mode('[EXPRESSION]');
                 }
             } else {
                 if (last_word === 'for') {
                     set_mode('(FOR-EXPRESSION)');
                 } else if (in_array(last_word, ['if', 'while'])) {
                     set_mode('(COND-EXPRESSION)');
                 } else {
                     set_mode('(EXPRESSION)');
                 }
             }
             if (last_text === ';' || last_type === 'TK_START_BLOCK') {
                 print_newline();
             } else if (last_type === 'TK_END_EXPR' || last_type === 'TK_START_EXPR' || last_type === 'TK_END_BLOCK' || last_text === '.') {
                 if (wanted_newline) {
                     print_newline();
                 }
                 // do nothing on (( and )( and ][ and ]( and .(
             } else if (last_type !== 'TK_WORD' && last_type !== 'TK_OPERATOR') {
                 print_single_space();
             } else if (last_word === 'function' || last_word === 'typeof') {
                 // function() vs function ()
                 if (opt_jslint_happy) {
                     print_single_space();
                 }
             } else if (in_array(last_text, line_starters) || last_text === 'catch') {
                 if (opt_space_before_conditional) {
                     print_single_space();
                 }
             }
             print_token();
             break;
         case 'TK_END_EXPR':
             if (token_text === ']') {
                 if (opt_keep_array_indentation) {
                     if (last_text === '}') {
                         // trim_output();
                         // print_newline(true);
                         remove_indent();
                         print_token();
                         restore_mode();
                         break;
                     }
                 } else {
                     if (flags.mode === '[INDENTED-EXPRESSION]') {
                         if (last_text === ']') {
                             restore_mode();
                             print_newline();
                             print_token();
                             break;
                         }
                     }
                 }
             }
             restore_mode();
             print_token();
             break;
         case 'TK_START_BLOCK':
             if (last_word === 'do') {
                 set_mode('DO_BLOCK');
             } else {
                 set_mode('BLOCK');
             }
             if (opt_brace_style === "expand" || opt_brace_style === "expand-strict") {
                 var empty_braces = false;
                 if (opt_brace_style === "expand-strict") {
                     empty_braces = (look_up() === '}');
                     if (!empty_braces) {
                         print_newline(true);
                     }
                 } else {
                     if (last_type !== 'TK_OPERATOR') {
                         if (last_text === '=' || (is_special_word(last_text) && last_text !== 'else')) {
                             print_single_space();
                         } else {
                             print_newline(true);
                         }
                     }
                 }
                 print_token();
                 if (!empty_braces) {
                     indent();
                 }
             } else {
                 if (last_type !== 'TK_OPERATOR' && last_type !== 'TK_START_EXPR') {
                     if (last_type === 'TK_START_BLOCK') {
                         print_newline();
                     } else {
                         print_single_space();
                     }
                 } else {
                     // if TK_OPERATOR or TK_START_EXPR
                     if (is_array(flags.previous_mode) && last_text === ',') {
                         if (last_last_text === '}') {
                             // }, { in array context
                             print_single_space();
                         } else {
                             print_newline(); // [a, b, c, {
                         }
                     }
                 }
                 indent();
                 print_token();
             }
             break;
         case 'TK_END_BLOCK':
             restore_mode();
             if (opt_brace_style === "expand" || opt_brace_style === "expand-strict") {
                 if (last_text !== '{') {
                     print_newline();
                 }
                 print_token();
             } else {
                 if (last_type === 'TK_START_BLOCK') {
                     // nothing
                     if (just_added_newline) {
                         remove_indent();
                     } else {
                         // {}
                         trim_output();
                     }
                 } else {
                     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();
                     }
                 }
                 print_token();
             }
             break;
         case 'TK_WORD':
             // no, it's not you. even I have problems understanding how this works
             // and what does what.
             if (do_block_just_closed) {
                 // do {} ## while ()
                 print_single_space();
                 print_token();
                 print_single_space();
                 do_block_just_closed = false;
                 break;
             }
             prefix = 'NONE';
             if (token_text === 'function') {
                 if (flags.var_line && last_type !== 'TK_EQUALS' ) {
                     flags.var_line_reindented = true;
                 }
                 if ((just_added_newline || last_text === ';') && last_text !== '{'
                 && last_type !== 'TK_BLOCK_COMMENT' && last_type !== 'TK_COMMENT') {
                     // make sure there is a nice clean space of at least one blank line
                     // before a new function definition
                     n_newlines = just_added_newline ? n_newlines : 0;
                     if (!opt_preserve_newlines) {
                         n_newlines = 1;
                     }
                     for (var i = 0; i < 2 - n_newlines; i++) {
                         print_newline(false);
                     }
                 }
                 if (last_type === 'TK_WORD') {
                     if (last_text === 'get' || last_text === 'set' || last_text === 'new' || last_text === 'return') {
                         print_single_space();
                     } else {
                         print_newline();
                     }
                 } else if (last_type === 'TK_OPERATOR' || last_text === '=') {
                     // foo = function
                     print_single_space();
                 } else if (is_expression(flags.mode)) {
                         //ää print nothing
                 } else {
                     print_newline();
                 }
                 print_token();
                 last_word = token_text;
                 break;
             }
             if (token_text === 'case' || (token_text === 'default' && flags.in_case_statement)) {
                 if (last_text === ':' || flags.case_body) {
                     // switch cases following one another
                     remove_indent();
                 } else {
                     // case statement starts in the same line where switch
                     if (!opt_indent_case) {
                         flags.indentation_level--;
                     }
                     print_newline();
                     if (!opt_indent_case) {
                         flags.indentation_level++;
                     }
                 }
                 print_token();
                 flags.in_case = true;
                 flags.in_case_statement = true;
                 flags.case_body = false;
                 break;
             }
             if (last_type === 'TK_END_BLOCK') {
                 if (!in_array(token_text.toLowerCase(), ['else', 'catch', 'finally'])) {
                     prefix = 'NEWLINE';
                 } else {
                     if (opt_brace_style === "expand" || opt_brace_style === "end-expand" || opt_brace_style === "expand-strict") {
                         prefix = 'NEWLINE';
                     } else {
                         prefix = 'SPACE';
                         print_single_space();
                     }
                 }
             } else if (last_type === 'TK_SEMICOLON' && (flags.mode === 'BLOCK' || flags.mode === 'DO_BLOCK')) {
                 prefix = 'NEWLINE';
             } else if (last_type === 'TK_SEMICOLON' && is_expression(flags.mode)) {
                 prefix = 'SPACE';
             } else if (last_type === 'TK_STRING') {
                 prefix = 'NEWLINE';
             } else if (last_type === 'TK_WORD') {
                 if (last_text === 'else') {
                     // eat newlines between ...else *** some_op...
                     // won't preserve extra newlines in this place (if any), but don't care that much
                     trim_output(true);
                 }
                 prefix = 'SPACE';
             } else if (last_type === 'TK_START_BLOCK') {
                 prefix = 'NEWLINE';
             } else if (last_type === 'TK_END_EXPR') {
                 print_single_space();
                 prefix = 'NEWLINE';
             }
             if (in_array(token_text, line_starters) && last_text !== ')') {
                 if (last_text === 'else') {
                     prefix = 'SPACE';
                 } else {
                     prefix = 'NEWLINE';
                 }
             }
             if (flags.if_line && last_type === 'TK_END_EXPR') {
                 flags.if_line = false;
             }
             if (in_array(token_text.toLowerCase(), ['else', 'catch', 'finally'])) {
                 if (last_type !== 'TK_END_BLOCK' || opt_brace_style === "expand" || opt_brace_style === "end-expand" || opt_brace_style === "expand-strict") {
                     print_newline();
                 } else {
                     trim_output(true);
                     print_single_space();
                 }
             } else if (prefix === 'NEWLINE') {
                 if (is_special_word(last_text)) {
                     // no newline between 'return nnn'
                     print_single_space();
                 } else if (last_type !== 'TK_END_EXPR') {
                     if ((last_type !== 'TK_START_EXPR' || token_text !== 'var') && last_text !== ':') {
                         // no need to force newline on 'var': for (var x = 0...)
                         if (token_text === 'if' && last_word === 'else' && last_text !== '{') {
                             // no newline for } else if {
                             print_single_space();
                         } else {
                             flags.var_line = false;
                             flags.var_line_reindented = false;
                             print_newline();
                         }
                     }
                 } else if (in_array(token_text, line_starters) && last_text !== ')') {
                     flags.var_line = false;
                     flags.var_line_reindented = false;
                     print_newline();
                 }
             } else if (is_array(flags.mode) && last_text === ',' && last_last_text === '}') {
                 print_newline(); // }, in lists get a newline treatment
             } else if (prefix === 'SPACE') {
                 print_single_space();
             }
             print_token();
             last_word = token_text;
             if (token_text === 'var') {
                 flags.var_line = true;
                 flags.var_line_reindented = false;
                 flags.var_line_tainted = false;
             }
             if (token_text === 'if') {
                 flags.if_line = true;
             }
             if (token_text === 'else') {
                 flags.if_line = false;
             }
             break;
         case 'TK_SEMICOLON':
             print_token();
             flags.var_line = false;
             flags.var_line_reindented = false;
             if (flags.mode === 'OBJECT') {
                 // OBJECT mode is weird and doesn't get reset too well.
                 flags.mode = 'BLOCK';
             }
             break;
         case 'TK_STRING':
             if (last_type === 'TK_END_EXPR' && in_array(flags.previous_mode, ['(COND-EXPRESSION)', '(FOR-EXPRESSION)'])) {
                 print_single_space();
             } else if (last_type === 'TK_COMMENT' || last_type === 'TK_STRING' || last_type === 'TK_START_BLOCK' || last_type === 'TK_END_BLOCK' || last_type === 'TK_SEMICOLON') {
                 print_newline();
             } else if (last_type === 'TK_WORD') {
                 print_single_space();
             }
             print_token();
             break;
         case 'TK_EQUALS':
             if (flags.var_line) {
                 // just got an '=' in a var-line, different formatting/line-breaking, etc will now be done
                 flags.var_line_tainted = true;
             }
             print_single_space();
             print_token();
             print_single_space();
             break;
         case 'TK_COMMA':
             if (flags.var_line) {
                 if (is_expression(flags.mode) || last_type === 'TK_END_BLOCK' ) {
                     // do not break on comma, for(var a = 1, b = 2)
                     flags.var_line_tainted = false;
                 }
                 if (flags.var_line_tainted) {
                     print_token();
                     flags.var_line_reindented = true;
                     flags.var_line_tainted = false;
                     print_newline();
                     break;
                 } else {
                     flags.var_line_tainted = false;
                 }
                 print_token();
                 print_single_space();
                 break;
             }
             if (last_type === 'TK_COMMENT') {
                 print_newline();
             }
             if (last_type === 'TK_END_BLOCK' && flags.mode !== "(EXPRESSION)") {
                 print_token();
                 if (flags.mode === 'OBJECT' && last_text === '}') {
                     print_newline();
                 } else {
                     print_single_space();
                 }
             } else {
                 if (flags.mode === 'OBJECT') {
                     print_token();
                     print_newline();
                 } else {
                     // EXPR or DO_BLOCK
                     print_token();
                     print_single_space();
                 }
             }
             break;
         case 'TK_OPERATOR':
             var space_before = true;
             var space_after = true;
             if (is_special_word(last_text)) {
                 // "return" had a special handling in TK_WORD. Now we need to return the favor
                 print_single_space();
                 print_token();
                 break;
             }
             // hack for actionscript's import .*;
             if (token_text === '*' && last_type === 'TK_UNKNOWN' && !last_last_text.match(/^\d+$/)) {
                 print_token();
                 break;
             }
             if (token_text === ':' && flags.in_case) {
                 if (opt_indent_case) {
                     flags.case_body = true;
                 }
                 print_token(); // colon really asks for separate treatment
                 print_newline();
                 flags.in_case = false;
                 break;
             }
             if (token_text === '::') {
                 // no spaces around exotic namespacing syntax operator
                 print_token();
                 break;
             }
             if (in_array(token_text, ['--', '++', '!']) || (in_array(token_text, ['-', '+']) && (in_array(last_type, ['TK_START_BLOCK', 'TK_START_EXPR', 'TK_EQUALS', 'TK_OPERATOR']) || in_array(last_text, line_starters)))) {
                 // unary operators (and binary +/- pretending to be unary) special cases
                 space_before = false;
                 space_after = false;
                 if (last_text === ';' && is_expression(flags.mode)) {
                     // for (;; ++i)
                     //        ^^^
                     space_before = true;
                 }
                 if (last_type === 'TK_WORD' && in_array(last_text, line_starters)) {
                     space_before = true;
                 }
                 if (flags.mode === 'BLOCK' && (last_text === '{' || last_text === ';')) {
                     // { foo; --i }
                     // foo(); --bar;
                     print_newline();
                 }
             } else if (token_text === '.') {
                 // decimal digits or object.property
                 space_before = false;
             } else if (token_text === ':') {
                 if (flags.ternary_depth === 0) {
                     if (flags.mode === 'BLOCK') {
                         flags.mode = 'OBJECT';
                     }
                     space_before = false;
                 } else {
                     flags.ternary_depth -= 1;
                 }
             } else if (token_text === '?') {
                 flags.ternary_depth += 1;
             }
             if (space_before) {
                 print_single_space();
             }
             print_token();
             if (space_after) {
                 print_single_space();
             }
             break;
         case 'TK_BLOCK_COMMENT':
             var lines = split_newlines(token_text);
             var j; // iterator for this case
             if (all_lines_start_with(lines.slice(1), '*')) {
                 // javadoc: reformat and reindent
                 print_newline();
                 output.push(lines[0]);
                 for (j = 1; j < lines.length; j++) {
                     print_newline();
                     output.push(' ');
                     output.push(trim(lines[j]));
                 }
             } else {
                 // simple block comment: leave intact
                 if (lines.length > 1) {
                     // multiline comment block starts with a new line
                     print_newline();
                 } else {
                     // single-line /* comment */ stays where it is
                     if (last_type === 'TK_END_BLOCK') {
                         print_newline();
                     } else {
                         print_single_space();
                     }
                 }
                 for (j = 0; j < lines.length; j++) {
                     output.push(lines[j]);
                     output.push("\n");
                 }
             }
             if (look_up('\n') !== '\n') {
                 print_newline();
             }
             break;
         case 'TK_INLINE_COMMENT':
             print_single_space();
             print_token();
             if (is_expression(flags.mode)) {
                 print_single_space();
             } else {
                 force_newline();
             }
             break;
         case 'TK_COMMENT':
             if (last_text === ',' && !wanted_newline) {
                 trim_output(true);
             }
             if (last_type !== 'TK_COMMENT') {
                 if (wanted_newline) {
                     print_newline();
                 } else {
                     print_single_space();
                 }
             }
             print_token();
             print_newline();
             break;
         case 'TK_UNKNOWN':
             if (is_special_word(last_text)) {
                 print_single_space();
             }
             print_token();
             break;
         }
         last_last_text = last_text;
         last_type = token_type;
         last_text = token_text;
     }
     var sweet_code = preindent_string + output.join('').replace(/[\r\n ]+$/, '');
     return sweet_code;
 }

The Tor Browser / annotate

browser/devtools/shared/Jsbeautify.jsm@6474c204b198 (annotated)

browser/devtools/shared/Jsbeautify.jsm