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1513 lines
50 KiB
1513 lines
50 KiB
/*********************************************************************** |
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A JavaScript tokenizer / parser / beautifier / compressor. |
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https://github.com/mishoo/UglifyJS2 |
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-------------------------------- (C) --------------------------------- |
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Author: Mihai Bazon |
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<mihai.bazon@gmail.com> |
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http://mihai.bazon.net/blog |
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Distributed under the BSD license: |
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Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com> |
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions |
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are met: |
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* Redistributions of source code must retain the above |
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copyright notice, this list of conditions and the following |
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disclaimer. |
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* Redistributions in binary form must reproduce the above |
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copyright notice, this list of conditions and the following |
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disclaimer in the documentation and/or other materials |
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provided with the distribution. |
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY |
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE |
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, |
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR |
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TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF |
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THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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SUCH DAMAGE. |
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***********************************************************************/ |
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"use strict"; |
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|
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var EXPECT_DIRECTIVE = /^$|[;{][\s\n]*$/; |
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|
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function is_some_comments(comment) { |
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// multiline comment |
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return comment.type == "comment2" && /@preserve|@license|@cc_on/i.test(comment.value); |
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} |
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|
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function OutputStream(options) { |
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|
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var readonly = !options; |
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options = defaults(options, { |
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ascii_only : false, |
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beautify : false, |
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braces : false, |
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comments : false, |
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ie8 : false, |
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indent_level : 4, |
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indent_start : 0, |
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inline_script : true, |
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keep_quoted_props: false, |
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max_line_len : false, |
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preamble : null, |
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preserve_line : false, |
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quote_keys : false, |
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quote_style : 0, |
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semicolons : true, |
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shebang : true, |
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source_map : null, |
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webkit : false, |
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width : 80, |
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wrap_iife : false, |
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}, true); |
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|
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// Convert comment option to RegExp if neccessary and set up comments filter |
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var comment_filter = return_false; // Default case, throw all comments away |
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if (options.comments) { |
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var comments = options.comments; |
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if (typeof options.comments === "string" && /^\/.*\/[a-zA-Z]*$/.test(options.comments)) { |
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var regex_pos = options.comments.lastIndexOf("/"); |
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comments = new RegExp( |
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options.comments.substr(1, regex_pos - 1), |
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options.comments.substr(regex_pos + 1) |
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); |
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} |
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if (comments instanceof RegExp) { |
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comment_filter = function(comment) { |
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return comment.type != "comment5" && comments.test(comment.value); |
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}; |
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} |
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else if (typeof comments === "function") { |
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comment_filter = function(comment) { |
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return comment.type != "comment5" && comments(this, comment); |
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}; |
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} |
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else if (comments === "some") { |
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comment_filter = is_some_comments; |
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} else { // NOTE includes "all" option |
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comment_filter = return_true; |
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} |
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} |
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|
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var indentation = 0; |
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var current_col = 0; |
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var current_line = 1; |
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var current_pos = 0; |
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var OUTPUT = ""; |
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|
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var to_utf8 = options.ascii_only ? function(str, identifier) { |
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return str.replace(/[\u0000-\u001f\u007f-\uffff]/g, function(ch) { |
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var code = ch.charCodeAt(0).toString(16); |
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if (code.length <= 2 && !identifier) { |
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while (code.length < 2) code = "0" + code; |
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return "\\x" + code; |
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} else { |
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while (code.length < 4) code = "0" + code; |
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return "\\u" + code; |
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} |
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}); |
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} : function(str) { |
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var s = ""; |
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for (var i = 0, len = str.length; i < len; i++) { |
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if (is_surrogate_pair_head(str[i]) && !is_surrogate_pair_tail(str[i + 1]) |
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|| is_surrogate_pair_tail(str[i]) && !is_surrogate_pair_head(str[i - 1])) { |
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s += "\\u" + str.charCodeAt(i).toString(16); |
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} else { |
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s += str[i]; |
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} |
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} |
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return s; |
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}; |
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|
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function make_string(str, quote) { |
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var dq = 0, sq = 0; |
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str = str.replace(/[\\\b\f\n\r\v\t\x22\x27\u2028\u2029\0\ufeff]/g, |
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function(s, i) { |
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switch (s) { |
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case '"': ++dq; return '"'; |
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case "'": ++sq; return "'"; |
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case "\\": return "\\\\"; |
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case "\n": return "\\n"; |
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case "\r": return "\\r"; |
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case "\t": return "\\t"; |
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case "\b": return "\\b"; |
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case "\f": return "\\f"; |
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case "\x0B": return options.ie8 ? "\\x0B" : "\\v"; |
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case "\u2028": return "\\u2028"; |
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case "\u2029": return "\\u2029"; |
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case "\ufeff": return "\\ufeff"; |
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case "\0": |
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return /[0-9]/.test(str.charAt(i+1)) ? "\\x00" : "\\0"; |
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} |
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return s; |
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}); |
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function quote_single() { |
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return "'" + str.replace(/\x27/g, "\\'") + "'"; |
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} |
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function quote_double() { |
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return '"' + str.replace(/\x22/g, '\\"') + '"'; |
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} |
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str = to_utf8(str); |
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switch (options.quote_style) { |
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case 1: |
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return quote_single(); |
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case 2: |
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return quote_double(); |
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case 3: |
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return quote == "'" ? quote_single() : quote_double(); |
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default: |
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return dq > sq ? quote_single() : quote_double(); |
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} |
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} |
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|
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function encode_string(str, quote) { |
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var ret = make_string(str, quote); |
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if (options.inline_script) { |
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ret = ret.replace(/<\x2f(script)([>\/\t\n\f\r ])/gi, "<\\/$1$2"); |
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ret = ret.replace(/\x3c!--/g, "\\x3c!--"); |
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ret = ret.replace(/--\x3e/g, "--\\x3e"); |
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} |
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return ret; |
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} |
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function make_name(name) { |
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name = name.toString(); |
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name = to_utf8(name, true); |
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return name; |
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} |
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|
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function make_indent(back) { |
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return repeat_string(" ", options.indent_start + indentation - back * options.indent_level); |
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} |
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|
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/* -----[ beautification/minification ]----- */ |
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var has_parens = false; |
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var line_end = 0; |
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var line_fixed = true; |
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var might_need_space = false; |
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var might_need_semicolon = false; |
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var need_newline_indented = false; |
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var need_space = false; |
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var newline_insert = -1; |
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var last = ""; |
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var mapping_token, mapping_name, mappings = options.source_map && []; |
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|
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var adjust_mappings = mappings ? function(line, col) { |
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mappings.forEach(function(mapping) { |
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mapping.line += line; |
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mapping.col += col; |
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}); |
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} : noop; |
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var flush_mappings = mappings ? function() { |
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mappings.forEach(function(mapping) { |
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try { |
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options.source_map.add( |
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mapping.token.file, |
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mapping.line, mapping.col, |
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mapping.token.line, mapping.token.col, |
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!mapping.name && mapping.token.type == "name" ? mapping.token.value : mapping.name |
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); |
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} catch(ex) { |
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AST_Node.warn("Couldn't figure out mapping for {file}:{line},{col} → {cline},{ccol} [{name}]", { |
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file: mapping.token.file, |
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line: mapping.token.line, |
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col: mapping.token.col, |
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cline: mapping.line, |
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ccol: mapping.col, |
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name: mapping.name || "" |
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}) |
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} |
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}); |
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mappings = []; |
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} : noop; |
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|
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function insert_newlines(count) { |
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var index = OUTPUT.lastIndexOf("\n"); |
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if (line_end < index) line_end = index; |
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var left = OUTPUT.slice(0, line_end); |
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var right = OUTPUT.slice(line_end); |
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adjust_mappings(count, right.length - current_col); |
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current_line += count; |
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current_pos += count; |
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current_col = right.length; |
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OUTPUT = left; |
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while (count--) OUTPUT += "\n"; |
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OUTPUT += right; |
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} |
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|
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var fix_line = options.max_line_len ? function() { |
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if (line_fixed) { |
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if (current_col > options.max_line_len) { |
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AST_Node.warn("Output exceeds {max_line_len} characters", options); |
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} |
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return; |
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} |
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if (current_col > options.max_line_len) insert_newlines(1); |
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line_fixed = true; |
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flush_mappings(); |
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} : noop; |
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|
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var requireSemicolonChars = makePredicate("( [ + * / - , ."); |
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|
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function print(str) { |
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str = String(str); |
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var ch = str.charAt(0); |
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if (need_newline_indented && ch) { |
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need_newline_indented = false; |
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if (ch != "\n") { |
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print("\n"); |
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indent(); |
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} |
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} |
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if (need_space && ch) { |
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need_space = false; |
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if (!/[\s;})]/.test(ch)) { |
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space(); |
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} |
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} |
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newline_insert = -1; |
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var prev = last.charAt(last.length - 1); |
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if (might_need_semicolon) { |
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might_need_semicolon = false; |
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|
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if (prev == ":" && ch == "}" || (!ch || ";}".indexOf(ch) < 0) && prev != ";") { |
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if (options.semicolons || requireSemicolonChars[ch]) { |
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OUTPUT += ";"; |
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current_col++; |
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current_pos++; |
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} else { |
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fix_line(); |
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OUTPUT += "\n"; |
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current_pos++; |
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current_line++; |
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current_col = 0; |
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|
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if (/^\s+$/.test(str)) { |
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// reset the semicolon flag, since we didn't print one |
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// now and might still have to later |
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might_need_semicolon = true; |
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} |
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} |
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|
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if (!options.beautify) |
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might_need_space = false; |
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} |
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} |
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|
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if (might_need_space) { |
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if ((is_identifier_char(prev) |
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&& (is_identifier_char(ch) || ch == "\\")) |
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|| (ch == "/" && ch == prev) |
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|| ((ch == "+" || ch == "-") && ch == last)) |
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{ |
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OUTPUT += " "; |
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current_col++; |
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current_pos++; |
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} |
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might_need_space = false; |
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} |
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|
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if (mapping_token) { |
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mappings.push({ |
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token: mapping_token, |
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name: mapping_name, |
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line: current_line, |
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col: current_col |
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}); |
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mapping_token = false; |
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if (line_fixed) flush_mappings(); |
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} |
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|
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OUTPUT += str; |
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has_parens = str[str.length - 1] == "("; |
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current_pos += str.length; |
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var a = str.split(/\r?\n/), n = a.length - 1; |
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current_line += n; |
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current_col += a[0].length; |
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if (n > 0) { |
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fix_line(); |
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current_col = a[n].length; |
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} |
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last = str; |
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} |
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|
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var space = options.beautify ? function() { |
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print(" "); |
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} : function() { |
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might_need_space = true; |
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}; |
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|
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var indent = options.beautify ? function(half) { |
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if (options.beautify) { |
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print(make_indent(half ? 0.5 : 0)); |
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} |
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} : noop; |
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|
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var with_indent = options.beautify ? function(col, cont) { |
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if (col === true) col = next_indent(); |
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var save_indentation = indentation; |
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indentation = col; |
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var ret = cont(); |
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indentation = save_indentation; |
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return ret; |
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} : function(col, cont) { return cont() }; |
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|
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var may_add_newline = options.max_line_len || options.preserve_line ? function() { |
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fix_line(); |
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line_end = OUTPUT.length; |
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line_fixed = false; |
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} : noop; |
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|
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var newline = options.beautify ? function() { |
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if (newline_insert < 0) return print("\n"); |
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if (OUTPUT[newline_insert] != "\n") { |
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OUTPUT = OUTPUT.slice(0, newline_insert) + "\n" + OUTPUT.slice(newline_insert); |
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current_pos++; |
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current_line++; |
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} |
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newline_insert++; |
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} : may_add_newline; |
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|
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var semicolon = options.beautify ? function() { |
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print(";"); |
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} : function() { |
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might_need_semicolon = true; |
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}; |
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|
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function force_semicolon() { |
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might_need_semicolon = false; |
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print(";"); |
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} |
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|
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function next_indent() { |
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return indentation + options.indent_level; |
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} |
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|
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function with_block(cont) { |
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var ret; |
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print("{"); |
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newline(); |
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with_indent(next_indent(), function() { |
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ret = cont(); |
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}); |
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indent(); |
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print("}"); |
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return ret; |
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} |
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|
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function with_parens(cont) { |
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print("("); |
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may_add_newline(); |
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//XXX: still nice to have that for argument lists |
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//var ret = with_indent(current_col, cont); |
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var ret = cont(); |
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may_add_newline(); |
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print(")"); |
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return ret; |
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} |
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|
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function with_square(cont) { |
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print("["); |
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may_add_newline(); |
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//var ret = with_indent(current_col, cont); |
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var ret = cont(); |
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may_add_newline(); |
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print("]"); |
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return ret; |
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} |
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|
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function comma() { |
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may_add_newline(); |
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print(","); |
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may_add_newline(); |
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space(); |
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} |
|
|
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function colon() { |
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print(":"); |
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space(); |
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} |
|
|
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var add_mapping = mappings ? function(token, name) { |
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mapping_token = token; |
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mapping_name = name; |
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} : noop; |
|
|
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function get() { |
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if (!line_fixed) fix_line(); |
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return OUTPUT; |
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} |
|
|
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function has_nlb() { |
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var index = OUTPUT.lastIndexOf("\n"); |
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return /^ *$/.test(OUTPUT.slice(index + 1)); |
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} |
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|
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function prepend_comments(node) { |
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var self = this; |
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var start = node.start; |
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if (!start) return; |
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if (start.comments_before && start.comments_before._dumped === self) return; |
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var comments = start.comments_before; |
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if (!comments) { |
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comments = start.comments_before = []; |
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} |
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comments._dumped = self; |
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|
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if (node instanceof AST_Exit && node.value) { |
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var tw = new TreeWalker(function(node) { |
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var parent = tw.parent(); |
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if (parent instanceof AST_Exit |
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|| parent instanceof AST_Binary && parent.left === node |
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|| parent.TYPE == "Call" && parent.expression === node |
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|| parent instanceof AST_Conditional && parent.condition === node |
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|| parent instanceof AST_Dot && parent.expression === node |
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|| parent instanceof AST_Sequence && parent.expressions[0] === node |
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|| parent instanceof AST_Sub && parent.expression === node |
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|| parent instanceof AST_UnaryPostfix) { |
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var text = node.start.comments_before; |
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if (text && text._dumped !== self) { |
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text._dumped = self; |
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comments = comments.concat(text); |
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} |
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} else { |
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return true; |
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} |
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}); |
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tw.push(node); |
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node.value.walk(tw); |
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} |
|
|
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if (current_pos == 0) { |
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if (comments.length > 0 && options.shebang && comments[0].type == "comment5") { |
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print("#!" + comments.shift().value + "\n"); |
|
indent(); |
|
} |
|
var preamble = options.preamble; |
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if (preamble) { |
|
print(preamble.replace(/\r\n?|[\n\u2028\u2029]|\s*$/g, "\n")); |
|
} |
|
} |
|
|
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comments = comments.filter(comment_filter, node); |
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if (comments.length == 0) return; |
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var last_nlb = has_nlb(); |
|
comments.forEach(function(c, i) { |
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if (!last_nlb) { |
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if (c.nlb) { |
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print("\n"); |
|
indent(); |
|
last_nlb = true; |
|
} else if (i > 0) { |
|
space(); |
|
} |
|
} |
|
if (/comment[134]/.test(c.type)) { |
|
print("//" + c.value.replace(/[@#]__PURE__/g, ' ') + "\n"); |
|
indent(); |
|
last_nlb = true; |
|
} else if (c.type == "comment2") { |
|
print("/*" + c.value.replace(/[@#]__PURE__/g, ' ') + "*/"); |
|
last_nlb = false; |
|
} |
|
}); |
|
if (!last_nlb) { |
|
if (start.nlb) { |
|
print("\n"); |
|
indent(); |
|
} else { |
|
space(); |
|
} |
|
} |
|
} |
|
|
|
function append_comments(node, tail) { |
|
var self = this; |
|
var token = node.end; |
|
if (!token) return; |
|
var comments = token[tail ? "comments_before" : "comments_after"]; |
|
if (!comments || comments._dumped === self) return; |
|
if (!(node instanceof AST_Statement || all(comments, function(c) { |
|
return !/comment[134]/.test(c.type); |
|
}))) return; |
|
comments._dumped = self; |
|
var insert = OUTPUT.length; |
|
comments.filter(comment_filter, node).forEach(function(c, i) { |
|
need_space = false; |
|
if (need_newline_indented) { |
|
print("\n"); |
|
indent(); |
|
need_newline_indented = false; |
|
} else if (c.nlb && (i > 0 || !has_nlb())) { |
|
print("\n"); |
|
indent(); |
|
} else if (i > 0 || !tail) { |
|
space(); |
|
} |
|
if (/comment[134]/.test(c.type)) { |
|
print("//" + c.value.replace(/[@#]__PURE__/g, ' ')); |
|
need_newline_indented = true; |
|
} else if (c.type == "comment2") { |
|
print("/*" + c.value.replace(/[@#]__PURE__/g, ' ') + "*/"); |
|
need_space = true; |
|
} |
|
}); |
|
if (OUTPUT.length > insert) newline_insert = insert; |
|
} |
|
|
|
var stack = []; |
|
return { |
|
get : get, |
|
toString : get, |
|
indent : indent, |
|
indentation : function() { return indentation }, |
|
current_width : function() { return current_col - indentation }, |
|
should_break : function() { return options.width && this.current_width() >= options.width }, |
|
has_parens : function() { return has_parens }, |
|
newline : newline, |
|
print : print, |
|
space : space, |
|
comma : comma, |
|
colon : colon, |
|
last : function() { return last }, |
|
semicolon : semicolon, |
|
force_semicolon : force_semicolon, |
|
to_utf8 : to_utf8, |
|
print_name : function(name) { print(make_name(name)) }, |
|
print_string : function(str, quote, escape_directive) { |
|
var encoded = encode_string(str, quote); |
|
if (escape_directive === true && encoded.indexOf("\\") === -1) { |
|
// Insert semicolons to break directive prologue |
|
if (!EXPECT_DIRECTIVE.test(OUTPUT)) { |
|
force_semicolon(); |
|
} |
|
force_semicolon(); |
|
} |
|
print(encoded); |
|
}, |
|
encode_string : encode_string, |
|
next_indent : next_indent, |
|
with_indent : with_indent, |
|
with_block : with_block, |
|
with_parens : with_parens, |
|
with_square : with_square, |
|
add_mapping : add_mapping, |
|
option : function(opt) { return options[opt] }, |
|
prepend_comments: readonly ? noop : prepend_comments, |
|
append_comments : readonly || comment_filter === return_false ? noop : append_comments, |
|
line : function() { return current_line }, |
|
col : function() { return current_col }, |
|
pos : function() { return current_pos }, |
|
push_node : function(node) { stack.push(node) }, |
|
pop_node : options.preserve_line ? function() { |
|
var node = stack.pop(); |
|
if (node.start && node.start.line > current_line) { |
|
insert_newlines(node.start.line - current_line); |
|
} |
|
} : function() { |
|
stack.pop(); |
|
}, |
|
parent : function(n) { |
|
return stack[stack.length - 2 - (n || 0)]; |
|
} |
|
}; |
|
} |
|
|
|
/* -----[ code generators ]----- */ |
|
|
|
(function() { |
|
|
|
/* -----[ utils ]----- */ |
|
|
|
function DEFPRINT(nodetype, generator) { |
|
nodetype.DEFMETHOD("_codegen", generator); |
|
} |
|
|
|
var in_directive = false; |
|
var active_scope = null; |
|
var use_asm = null; |
|
|
|
AST_Node.DEFMETHOD("print", function(stream, force_parens) { |
|
var self = this, generator = self._codegen; |
|
if (self instanceof AST_Scope) { |
|
active_scope = self; |
|
} |
|
else if (!use_asm && self instanceof AST_Directive && self.value == "use asm") { |
|
use_asm = active_scope; |
|
} |
|
function doit() { |
|
stream.prepend_comments(self); |
|
self.add_source_map(stream); |
|
generator(self, stream); |
|
stream.append_comments(self); |
|
} |
|
stream.push_node(self); |
|
if (force_parens || self.needs_parens(stream)) { |
|
stream.with_parens(doit); |
|
} else { |
|
doit(); |
|
} |
|
stream.pop_node(); |
|
if (self === use_asm) { |
|
use_asm = null; |
|
} |
|
}); |
|
AST_Node.DEFMETHOD("_print", AST_Node.prototype.print); |
|
|
|
AST_Node.DEFMETHOD("print_to_string", function(options) { |
|
var s = OutputStream(options); |
|
this.print(s); |
|
return s.get(); |
|
}); |
|
|
|
/* -----[ PARENTHESES ]----- */ |
|
|
|
function PARENS(nodetype, func) { |
|
if (Array.isArray(nodetype)) { |
|
nodetype.forEach(function(nodetype) { |
|
PARENS(nodetype, func); |
|
}); |
|
} else { |
|
nodetype.DEFMETHOD("needs_parens", func); |
|
} |
|
} |
|
|
|
PARENS(AST_Node, return_false); |
|
|
|
// a function expression needs parens around it when it's provably |
|
// the first token to appear in a statement. |
|
PARENS(AST_Function, function(output) { |
|
if (!output.has_parens() && first_in_statement(output)) return true; |
|
if (output.option('webkit')) { |
|
var p = output.parent(); |
|
if (p instanceof AST_PropAccess && p.expression === this) return true; |
|
} |
|
if (output.option('wrap_iife')) { |
|
var p = output.parent(); |
|
if (p instanceof AST_Call && p.expression === this) return true; |
|
} |
|
}); |
|
|
|
// same goes for an object literal, because otherwise it would be |
|
// interpreted as a block of code. |
|
PARENS(AST_Object, function(output) { |
|
return !output.has_parens() && first_in_statement(output); |
|
}); |
|
|
|
PARENS(AST_Unary, function(output) { |
|
var p = output.parent(); |
|
return p instanceof AST_PropAccess && p.expression === this |
|
|| p instanceof AST_Call && p.expression === this; |
|
}); |
|
|
|
PARENS(AST_Sequence, function(output) { |
|
var p = output.parent(); |
|
return p instanceof AST_Call // (foo, bar)() or foo(1, (2, 3), 4) |
|
|| p instanceof AST_Unary // !(foo, bar, baz) |
|
|| p instanceof AST_Binary // 1 + (2, 3) + 4 ==> 8 |
|
|| p instanceof AST_VarDef // var a = (1, 2), b = a + a; ==> b == 4 |
|
|| p instanceof AST_PropAccess // (1, {foo:2}).foo or (1, {foo:2})["foo"] ==> 2 |
|
|| p instanceof AST_Array // [ 1, (2, 3), 4 ] ==> [ 1, 3, 4 ] |
|
|| p instanceof AST_ObjectProperty // { foo: (1, 2) }.foo ==> 2 |
|
|| p instanceof AST_Conditional /* (false, true) ? (a = 10, b = 20) : (c = 30) |
|
* ==> 20 (side effect, set a := 10 and b := 20) */ |
|
; |
|
}); |
|
|
|
PARENS(AST_Binary, function(output) { |
|
var p = output.parent(); |
|
// (foo && bar)() |
|
if (p instanceof AST_Call && p.expression === this) |
|
return true; |
|
// typeof (foo && bar) |
|
if (p instanceof AST_Unary) |
|
return true; |
|
// (foo && bar)["prop"], (foo && bar).prop |
|
if (p instanceof AST_PropAccess && p.expression === this) |
|
return true; |
|
// this deals with precedence: 3 * (2 + 1) |
|
if (p instanceof AST_Binary) { |
|
var po = p.operator, pp = PRECEDENCE[po]; |
|
var so = this.operator, sp = PRECEDENCE[so]; |
|
if (pp > sp |
|
|| (pp == sp |
|
&& this === p.right)) { |
|
return true; |
|
} |
|
} |
|
}); |
|
|
|
PARENS(AST_PropAccess, function(output) { |
|
var p = output.parent(); |
|
if (p instanceof AST_New && p.expression === this) { |
|
// i.e. new (foo.bar().baz) |
|
// |
|
// if there's one call into this subtree, then we need |
|
// parens around it too, otherwise the call will be |
|
// interpreted as passing the arguments to the upper New |
|
// expression. |
|
var parens = false; |
|
this.walk(new TreeWalker(function(node) { |
|
if (parens || node instanceof AST_Scope) return true; |
|
if (node instanceof AST_Call) { |
|
parens = true; |
|
return true; |
|
} |
|
})); |
|
return parens; |
|
} |
|
}); |
|
|
|
PARENS(AST_Call, function(output) { |
|
var p = output.parent(); |
|
if (p instanceof AST_New && p.expression === this) return true; |
|
// https://bugs.webkit.org/show_bug.cgi?id=123506 |
|
if (output.option('webkit')) { |
|
var g = output.parent(1); |
|
return this.expression instanceof AST_Function |
|
&& p instanceof AST_PropAccess |
|
&& p.expression === this |
|
&& g instanceof AST_Assign |
|
&& g.left === p; |
|
} |
|
}); |
|
|
|
PARENS(AST_New, function(output) { |
|
var p = output.parent(); |
|
if (!need_constructor_parens(this, output) |
|
&& (p instanceof AST_PropAccess // (new Date).getTime(), (new Date)["getTime"]() |
|
|| p instanceof AST_Call && p.expression === this)) // (new foo)(bar) |
|
return true; |
|
}); |
|
|
|
PARENS(AST_Number, function(output) { |
|
var p = output.parent(); |
|
if (p instanceof AST_PropAccess && p.expression === this) { |
|
var value = this.getValue(); |
|
if (value < 0 || /^0/.test(make_num(value))) { |
|
return true; |
|
} |
|
} |
|
}); |
|
|
|
PARENS([ AST_Assign, AST_Conditional ], function(output) { |
|
var p = output.parent(); |
|
// !(a = false) → true |
|
if (p instanceof AST_Unary) |
|
return true; |
|
// 1 + (a = 2) + 3 → 6, side effect setting a = 2 |
|
if (p instanceof AST_Binary && !(p instanceof AST_Assign)) |
|
return true; |
|
// (a = func)() —or— new (a = Object)() |
|
if (p instanceof AST_Call && p.expression === this) |
|
return true; |
|
// (a = foo) ? bar : baz |
|
if (p instanceof AST_Conditional && p.condition === this) |
|
return true; |
|
// (a = foo)["prop"] —or— (a = foo).prop |
|
if (p instanceof AST_PropAccess && p.expression === this) |
|
return true; |
|
}); |
|
|
|
/* -----[ PRINTERS ]----- */ |
|
|
|
DEFPRINT(AST_Directive, function(self, output) { |
|
output.print_string(self.value, self.quote); |
|
output.semicolon(); |
|
}); |
|
DEFPRINT(AST_Debugger, function(self, output) { |
|
output.print("debugger"); |
|
output.semicolon(); |
|
}); |
|
|
|
/* -----[ statements ]----- */ |
|
|
|
function display_body(body, is_toplevel, output, allow_directives) { |
|
var last = body.length - 1; |
|
in_directive = allow_directives; |
|
body.forEach(function(stmt, i) { |
|
if (in_directive === true && !(stmt instanceof AST_Directive || |
|
stmt instanceof AST_EmptyStatement || |
|
(stmt instanceof AST_SimpleStatement && stmt.body instanceof AST_String) |
|
)) { |
|
in_directive = false; |
|
} |
|
if (!(stmt instanceof AST_EmptyStatement)) { |
|
output.indent(); |
|
stmt.print(output); |
|
if (!(i == last && is_toplevel)) { |
|
output.newline(); |
|
if (is_toplevel) output.newline(); |
|
} |
|
} |
|
if (in_directive === true && |
|
stmt instanceof AST_SimpleStatement && |
|
stmt.body instanceof AST_String |
|
) { |
|
in_directive = false; |
|
} |
|
}); |
|
in_directive = false; |
|
} |
|
|
|
AST_StatementWithBody.DEFMETHOD("_do_print_body", function(output) { |
|
force_statement(this.body, output); |
|
}); |
|
|
|
DEFPRINT(AST_Statement, function(self, output) { |
|
self.body.print(output); |
|
output.semicolon(); |
|
}); |
|
DEFPRINT(AST_Toplevel, function(self, output) { |
|
display_body(self.body, true, output, true); |
|
output.print(""); |
|
}); |
|
DEFPRINT(AST_LabeledStatement, function(self, output) { |
|
self.label.print(output); |
|
output.colon(); |
|
self.body.print(output); |
|
}); |
|
DEFPRINT(AST_SimpleStatement, function(self, output) { |
|
self.body.print(output); |
|
output.semicolon(); |
|
}); |
|
function print_braced_empty(self, output) { |
|
output.print("{"); |
|
output.with_indent(output.next_indent(), function() { |
|
output.append_comments(self, true); |
|
}); |
|
output.print("}"); |
|
} |
|
function print_braced(self, output, allow_directives) { |
|
if (self.body.length > 0) { |
|
output.with_block(function() { |
|
display_body(self.body, false, output, allow_directives); |
|
}); |
|
} else print_braced_empty(self, output); |
|
} |
|
DEFPRINT(AST_BlockStatement, function(self, output) { |
|
print_braced(self, output); |
|
}); |
|
DEFPRINT(AST_EmptyStatement, function(self, output) { |
|
output.semicolon(); |
|
}); |
|
DEFPRINT(AST_Do, function(self, output) { |
|
output.print("do"); |
|
output.space(); |
|
make_block(self.body, output); |
|
output.space(); |
|
output.print("while"); |
|
output.space(); |
|
output.with_parens(function() { |
|
self.condition.print(output); |
|
}); |
|
output.semicolon(); |
|
}); |
|
DEFPRINT(AST_While, function(self, output) { |
|
output.print("while"); |
|
output.space(); |
|
output.with_parens(function() { |
|
self.condition.print(output); |
|
}); |
|
output.space(); |
|
self._do_print_body(output); |
|
}); |
|
DEFPRINT(AST_For, function(self, output) { |
|
output.print("for"); |
|
output.space(); |
|
output.with_parens(function() { |
|
if (self.init) { |
|
if (self.init instanceof AST_Definitions) { |
|
self.init.print(output); |
|
} else { |
|
parenthesize_for_noin(self.init, output, true); |
|
} |
|
output.print(";"); |
|
output.space(); |
|
} else { |
|
output.print(";"); |
|
} |
|
if (self.condition) { |
|
self.condition.print(output); |
|
output.print(";"); |
|
output.space(); |
|
} else { |
|
output.print(";"); |
|
} |
|
if (self.step) { |
|
self.step.print(output); |
|
} |
|
}); |
|
output.space(); |
|
self._do_print_body(output); |
|
}); |
|
DEFPRINT(AST_ForIn, function(self, output) { |
|
output.print("for"); |
|
output.space(); |
|
output.with_parens(function() { |
|
self.init.print(output); |
|
output.space(); |
|
output.print("in"); |
|
output.space(); |
|
self.object.print(output); |
|
}); |
|
output.space(); |
|
self._do_print_body(output); |
|
}); |
|
DEFPRINT(AST_With, function(self, output) { |
|
output.print("with"); |
|
output.space(); |
|
output.with_parens(function() { |
|
self.expression.print(output); |
|
}); |
|
output.space(); |
|
self._do_print_body(output); |
|
}); |
|
|
|
/* -----[ functions ]----- */ |
|
AST_Lambda.DEFMETHOD("_do_print", function(output, nokeyword) { |
|
var self = this; |
|
if (!nokeyword) { |
|
output.print("function"); |
|
} |
|
if (self.name) { |
|
output.space(); |
|
self.name.print(output); |
|
} |
|
output.with_parens(function() { |
|
self.argnames.forEach(function(arg, i) { |
|
if (i) output.comma(); |
|
arg.print(output); |
|
}); |
|
}); |
|
output.space(); |
|
print_braced(self, output, true); |
|
}); |
|
DEFPRINT(AST_Lambda, function(self, output) { |
|
self._do_print(output); |
|
}); |
|
|
|
/* -----[ jumps ]----- */ |
|
function print_jump(output, kind, target) { |
|
output.print(kind); |
|
if (target) { |
|
output.space(); |
|
target.print(output); |
|
} |
|
output.semicolon(); |
|
} |
|
|
|
DEFPRINT(AST_Return, function(self, output) { |
|
print_jump(output, "return", self.value); |
|
}); |
|
DEFPRINT(AST_Throw, function(self, output) { |
|
print_jump(output, "throw", self.value); |
|
}); |
|
DEFPRINT(AST_Break, function(self, output) { |
|
print_jump(output, "break", self.label); |
|
}); |
|
DEFPRINT(AST_Continue, function(self, output) { |
|
print_jump(output, "continue", self.label); |
|
}); |
|
|
|
/* -----[ if ]----- */ |
|
function make_then(self, output) { |
|
var b = self.body; |
|
if (output.option("braces") |
|
|| output.option("ie8") && b instanceof AST_Do) |
|
return make_block(b, output); |
|
// The squeezer replaces "block"-s that contain only a single |
|
// statement with the statement itself; technically, the AST |
|
// is correct, but this can create problems when we output an |
|
// IF having an ELSE clause where the THEN clause ends in an |
|
// IF *without* an ELSE block (then the outer ELSE would refer |
|
// to the inner IF). This function checks for this case and |
|
// adds the block braces if needed. |
|
if (!b) return output.force_semicolon(); |
|
while (true) { |
|
if (b instanceof AST_If) { |
|
if (!b.alternative) { |
|
make_block(self.body, output); |
|
return; |
|
} |
|
b = b.alternative; |
|
} |
|
else if (b instanceof AST_StatementWithBody) { |
|
b = b.body; |
|
} |
|
else break; |
|
} |
|
force_statement(self.body, output); |
|
} |
|
DEFPRINT(AST_If, function(self, output) { |
|
output.print("if"); |
|
output.space(); |
|
output.with_parens(function() { |
|
self.condition.print(output); |
|
}); |
|
output.space(); |
|
if (self.alternative) { |
|
make_then(self, output); |
|
output.space(); |
|
output.print("else"); |
|
output.space(); |
|
if (self.alternative instanceof AST_If) |
|
self.alternative.print(output); |
|
else |
|
force_statement(self.alternative, output); |
|
} else { |
|
self._do_print_body(output); |
|
} |
|
}); |
|
|
|
/* -----[ switch ]----- */ |
|
DEFPRINT(AST_Switch, function(self, output) { |
|
output.print("switch"); |
|
output.space(); |
|
output.with_parens(function() { |
|
self.expression.print(output); |
|
}); |
|
output.space(); |
|
var last = self.body.length - 1; |
|
if (last < 0) print_braced_empty(self, output); |
|
else output.with_block(function() { |
|
self.body.forEach(function(branch, i) { |
|
output.indent(true); |
|
branch.print(output); |
|
if (i < last && branch.body.length > 0) |
|
output.newline(); |
|
}); |
|
}); |
|
}); |
|
AST_SwitchBranch.DEFMETHOD("_do_print_body", function(output) { |
|
output.newline(); |
|
this.body.forEach(function(stmt) { |
|
output.indent(); |
|
stmt.print(output); |
|
output.newline(); |
|
}); |
|
}); |
|
DEFPRINT(AST_Default, function(self, output) { |
|
output.print("default:"); |
|
self._do_print_body(output); |
|
}); |
|
DEFPRINT(AST_Case, function(self, output) { |
|
output.print("case"); |
|
output.space(); |
|
self.expression.print(output); |
|
output.print(":"); |
|
self._do_print_body(output); |
|
}); |
|
|
|
/* -----[ exceptions ]----- */ |
|
DEFPRINT(AST_Try, function(self, output) { |
|
output.print("try"); |
|
output.space(); |
|
print_braced(self, output); |
|
if (self.bcatch) { |
|
output.space(); |
|
self.bcatch.print(output); |
|
} |
|
if (self.bfinally) { |
|
output.space(); |
|
self.bfinally.print(output); |
|
} |
|
}); |
|
DEFPRINT(AST_Catch, function(self, output) { |
|
output.print("catch"); |
|
output.space(); |
|
output.with_parens(function() { |
|
self.argname.print(output); |
|
}); |
|
output.space(); |
|
print_braced(self, output); |
|
}); |
|
DEFPRINT(AST_Finally, function(self, output) { |
|
output.print("finally"); |
|
output.space(); |
|
print_braced(self, output); |
|
}); |
|
|
|
DEFPRINT(AST_Var, function(self, output) { |
|
output.print("var"); |
|
output.space(); |
|
self.definitions.forEach(function(def, i) { |
|
if (i) output.comma(); |
|
def.print(output); |
|
}); |
|
var p = output.parent(); |
|
if (p && p.init !== self || !(p instanceof AST_For || p instanceof AST_ForIn)) output.semicolon(); |
|
}); |
|
|
|
function parenthesize_for_noin(node, output, noin) { |
|
var parens = false; |
|
// need to take some precautions here: |
|
// https://github.com/mishoo/UglifyJS2/issues/60 |
|
if (noin) node.walk(new TreeWalker(function(node) { |
|
if (parens || node instanceof AST_Scope) return true; |
|
if (node instanceof AST_Binary && node.operator == "in") { |
|
parens = true; |
|
return true; |
|
} |
|
})); |
|
node.print(output, parens); |
|
} |
|
|
|
DEFPRINT(AST_VarDef, function(self, output) { |
|
self.name.print(output); |
|
if (self.value) { |
|
output.space(); |
|
output.print("="); |
|
output.space(); |
|
var p = output.parent(1); |
|
var noin = p instanceof AST_For || p instanceof AST_ForIn; |
|
parenthesize_for_noin(self.value, output, noin); |
|
} |
|
}); |
|
|
|
/* -----[ other expressions ]----- */ |
|
DEFPRINT(AST_Call, function(self, output) { |
|
self.expression.print(output); |
|
if (self instanceof AST_New && !need_constructor_parens(self, output)) |
|
return; |
|
if (self.expression instanceof AST_Call || self.expression instanceof AST_Lambda) { |
|
output.add_mapping(self.start); |
|
} |
|
output.with_parens(function() { |
|
self.args.forEach(function(expr, i) { |
|
if (i) output.comma(); |
|
expr.print(output); |
|
}); |
|
}); |
|
}); |
|
DEFPRINT(AST_New, function(self, output) { |
|
output.print("new"); |
|
output.space(); |
|
AST_Call.prototype._codegen(self, output); |
|
}); |
|
DEFPRINT(AST_Sequence, function(self, output) { |
|
self.expressions.forEach(function(node, index) { |
|
if (index > 0) { |
|
output.comma(); |
|
if (output.should_break()) { |
|
output.newline(); |
|
output.indent(); |
|
} |
|
} |
|
node.print(output); |
|
}); |
|
}); |
|
DEFPRINT(AST_Dot, function(self, output) { |
|
var expr = self.expression; |
|
expr.print(output); |
|
var prop = self.property; |
|
if (output.option("ie8") && RESERVED_WORDS[prop]) { |
|
output.print("["); |
|
output.add_mapping(self.end); |
|
output.print_string(prop); |
|
output.print("]"); |
|
} else { |
|
if (expr instanceof AST_Number && expr.getValue() >= 0) { |
|
if (!/[xa-f.)]/i.test(output.last())) { |
|
output.print("."); |
|
} |
|
} |
|
output.print("."); |
|
// the name after dot would be mapped about here. |
|
output.add_mapping(self.end); |
|
output.print_name(prop); |
|
} |
|
}); |
|
DEFPRINT(AST_Sub, function(self, output) { |
|
self.expression.print(output); |
|
output.print("["); |
|
self.property.print(output); |
|
output.print("]"); |
|
}); |
|
DEFPRINT(AST_UnaryPrefix, function(self, output) { |
|
var op = self.operator; |
|
output.print(op); |
|
if (/^[a-z]/i.test(op) |
|
|| (/[+-]$/.test(op) |
|
&& self.expression instanceof AST_UnaryPrefix |
|
&& /^[+-]/.test(self.expression.operator))) { |
|
output.space(); |
|
} |
|
self.expression.print(output); |
|
}); |
|
DEFPRINT(AST_UnaryPostfix, function(self, output) { |
|
self.expression.print(output); |
|
output.print(self.operator); |
|
}); |
|
DEFPRINT(AST_Binary, function(self, output) { |
|
var op = self.operator; |
|
self.left.print(output); |
|
if (op[0] == ">" /* ">>" ">>>" ">" ">=" */ |
|
&& self.left instanceof AST_UnaryPostfix |
|
&& self.left.operator == "--") { |
|
// space is mandatory to avoid outputting --> |
|
output.print(" "); |
|
} else { |
|
// the space is optional depending on "beautify" |
|
output.space(); |
|
} |
|
output.print(op); |
|
if ((op == "<" || op == "<<") |
|
&& self.right instanceof AST_UnaryPrefix |
|
&& self.right.operator == "!" |
|
&& self.right.expression instanceof AST_UnaryPrefix |
|
&& self.right.expression.operator == "--") { |
|
// space is mandatory to avoid outputting <!-- |
|
output.print(" "); |
|
} else { |
|
// the space is optional depending on "beautify" |
|
output.space(); |
|
} |
|
self.right.print(output); |
|
}); |
|
DEFPRINT(AST_Conditional, function(self, output) { |
|
self.condition.print(output); |
|
output.space(); |
|
output.print("?"); |
|
output.space(); |
|
self.consequent.print(output); |
|
output.space(); |
|
output.colon(); |
|
self.alternative.print(output); |
|
}); |
|
|
|
/* -----[ literals ]----- */ |
|
DEFPRINT(AST_Array, function(self, output) { |
|
output.with_square(function() { |
|
var a = self.elements, len = a.length; |
|
if (len > 0) output.space(); |
|
a.forEach(function(exp, i) { |
|
if (i) output.comma(); |
|
exp.print(output); |
|
// If the final element is a hole, we need to make sure it |
|
// doesn't look like a trailing comma, by inserting an actual |
|
// trailing comma. |
|
if (i === len - 1 && exp instanceof AST_Hole) |
|
output.comma(); |
|
}); |
|
if (len > 0) output.space(); |
|
}); |
|
}); |
|
DEFPRINT(AST_Object, function(self, output) { |
|
if (self.properties.length > 0) output.with_block(function() { |
|
self.properties.forEach(function(prop, i) { |
|
if (i) { |
|
output.print(","); |
|
output.newline(); |
|
} |
|
output.indent(); |
|
prop.print(output); |
|
}); |
|
output.newline(); |
|
}); |
|
else print_braced_empty(self, output); |
|
}); |
|
|
|
function print_property_name(key, quote, output) { |
|
if (output.option("quote_keys")) { |
|
output.print_string(key); |
|
} else if ("" + +key == key && key >= 0) { |
|
output.print(make_num(key)); |
|
} else if (RESERVED_WORDS[key] ? !output.option("ie8") : is_identifier_string(key)) { |
|
if (quote && output.option("keep_quoted_props")) { |
|
output.print_string(key, quote); |
|
} else { |
|
output.print_name(key); |
|
} |
|
} else { |
|
output.print_string(key, quote); |
|
} |
|
} |
|
|
|
DEFPRINT(AST_ObjectKeyVal, function(self, output) { |
|
print_property_name(self.key, self.quote, output); |
|
output.colon(); |
|
self.value.print(output); |
|
}); |
|
AST_ObjectProperty.DEFMETHOD("_print_getter_setter", function(type, output) { |
|
output.print(type); |
|
output.space(); |
|
print_property_name(this.key.name, this.quote, output); |
|
this.value._do_print(output, true); |
|
}); |
|
DEFPRINT(AST_ObjectSetter, function(self, output) { |
|
self._print_getter_setter("set", output); |
|
}); |
|
DEFPRINT(AST_ObjectGetter, function(self, output) { |
|
self._print_getter_setter("get", output); |
|
}); |
|
DEFPRINT(AST_Symbol, function(self, output) { |
|
var def = self.definition(); |
|
output.print_name(def ? def.mangled_name || def.name : self.name); |
|
}); |
|
DEFPRINT(AST_Hole, noop); |
|
DEFPRINT(AST_This, function(self, output) { |
|
output.print("this"); |
|
}); |
|
DEFPRINT(AST_Constant, function(self, output) { |
|
output.print(self.getValue()); |
|
}); |
|
DEFPRINT(AST_String, function(self, output) { |
|
output.print_string(self.getValue(), self.quote, in_directive); |
|
}); |
|
DEFPRINT(AST_Number, function(self, output) { |
|
if (use_asm && self.start && self.start.raw != null) { |
|
output.print(self.start.raw); |
|
} else { |
|
output.print(make_num(self.getValue())); |
|
} |
|
}); |
|
|
|
DEFPRINT(AST_RegExp, function(self, output) { |
|
var regexp = self.getValue(); |
|
var str = regexp.toString(); |
|
if (regexp.raw_source) { |
|
str = "/" + regexp.raw_source + str.slice(str.lastIndexOf("/")); |
|
} |
|
str = output.to_utf8(str); |
|
output.print(str); |
|
var p = output.parent(); |
|
if (p instanceof AST_Binary && /^in/.test(p.operator) && p.left === self) |
|
output.print(" "); |
|
}); |
|
|
|
function force_statement(stat, output) { |
|
if (output.option("braces")) { |
|
make_block(stat, output); |
|
} else { |
|
if (!stat || stat instanceof AST_EmptyStatement) |
|
output.force_semicolon(); |
|
else |
|
stat.print(output); |
|
} |
|
} |
|
|
|
// self should be AST_New. decide if we want to show parens or not. |
|
function need_constructor_parens(self, output) { |
|
// Always print parentheses with arguments |
|
if (self.args.length > 0) return true; |
|
|
|
return output.option("beautify"); |
|
} |
|
|
|
function best_of(a) { |
|
var best = a[0], len = best.length; |
|
for (var i = 1; i < a.length; ++i) { |
|
if (a[i].length < len) { |
|
best = a[i]; |
|
len = best.length; |
|
} |
|
} |
|
return best; |
|
} |
|
|
|
function make_num(num) { |
|
var str = num.toString(10).replace(/^0\./, ".").replace("e+", "e"); |
|
var candidates = [ str ]; |
|
if (Math.floor(num) === num) { |
|
if (num < 0) { |
|
candidates.push("-0x" + (-num).toString(16).toLowerCase()); |
|
} else { |
|
candidates.push("0x" + num.toString(16).toLowerCase()); |
|
} |
|
} |
|
var match, len, digits; |
|
if (match = /^\.0+/.exec(str)) { |
|
len = match[0].length; |
|
digits = str.slice(len); |
|
candidates.push(digits + "e-" + (digits.length + len - 1)); |
|
} else if (match = /0+$/.exec(str)) { |
|
len = match[0].length; |
|
candidates.push(str.slice(0, -len) + "e" + len); |
|
} else if (match = /^(\d)\.(\d+)e(-?\d+)$/.exec(str)) { |
|
candidates.push(match[1] + match[2] + "e" + (match[3] - match[2].length)); |
|
} |
|
return best_of(candidates); |
|
} |
|
|
|
function make_block(stmt, output) { |
|
if (!stmt || stmt instanceof AST_EmptyStatement) |
|
output.print("{}"); |
|
else if (stmt instanceof AST_BlockStatement) |
|
stmt.print(output); |
|
else output.with_block(function() { |
|
output.indent(); |
|
stmt.print(output); |
|
output.newline(); |
|
}); |
|
} |
|
|
|
/* -----[ source map generators ]----- */ |
|
|
|
function DEFMAP(nodetype, generator) { |
|
nodetype.forEach(function(nodetype) { |
|
nodetype.DEFMETHOD("add_source_map", generator); |
|
}); |
|
} |
|
|
|
DEFMAP([ |
|
// We could easily add info for ALL nodes, but it seems to me that |
|
// would be quite wasteful, hence this noop in the base class. |
|
AST_Node, |
|
// since the label symbol will mark it |
|
AST_LabeledStatement, |
|
AST_Toplevel, |
|
], noop); |
|
|
|
// XXX: I'm not exactly sure if we need it for all of these nodes, |
|
// or if we should add even more. |
|
DEFMAP([ |
|
AST_Array, |
|
AST_BlockStatement, |
|
AST_Catch, |
|
AST_Constant, |
|
AST_Debugger, |
|
AST_Definitions, |
|
AST_Directive, |
|
AST_Finally, |
|
AST_Jump, |
|
AST_Lambda, |
|
AST_New, |
|
AST_Object, |
|
AST_StatementWithBody, |
|
AST_Symbol, |
|
AST_Switch, |
|
AST_SwitchBranch, |
|
AST_Try, |
|
], function(output) { |
|
output.add_mapping(this.start); |
|
}); |
|
|
|
DEFMAP([ |
|
AST_ObjectGetter, |
|
AST_ObjectSetter, |
|
], function(output) { |
|
output.add_mapping(this.start, this.key.name); |
|
}); |
|
|
|
DEFMAP([ AST_ObjectProperty ], function(output) { |
|
output.add_mapping(this.start, this.key); |
|
}); |
|
})();
|
|
|