From 26105034da4fcce7ac883c899d781f016559310d Mon Sep 17 00:00:00 2001 From: ruki Date: Thu, 8 Nov 2018 00:38:48 +0800 Subject: switch to vuepress --- node_modules/uglify-es/lib/output.js | 1915 ++++++++++++++++++++++++++++++++++ 1 file changed, 1915 insertions(+) create mode 100644 node_modules/uglify-es/lib/output.js (limited to 'node_modules/uglify-es/lib/output.js') diff --git a/node_modules/uglify-es/lib/output.js b/node_modules/uglify-es/lib/output.js new file mode 100644 index 00000000..e4987179 --- /dev/null +++ b/node_modules/uglify-es/lib/output.js @@ -0,0 +1,1915 @@ +/*********************************************************************** + + A JavaScript tokenizer / parser / beautifier / compressor. + https://github.com/mishoo/UglifyJS2 + + -------------------------------- (C) --------------------------------- + + Author: Mihai Bazon + + http://mihai.bazon.net/blog + + Distributed under the BSD license: + + Copyright 2012 (c) Mihai Bazon + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + * Redistributions of source code must retain the above + copyright notice, this list of conditions and the following + disclaimer. + + * Redistributions in binary form must reproduce the above + copyright notice, this list of conditions and the following + disclaimer in the documentation and/or other materials + provided with the distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY + EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, + OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR + TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF + THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + SUCH DAMAGE. + + ***********************************************************************/ + +"use strict"; + +var EXPECT_DIRECTIVE = /^$|[;{][\s\n]*$/; + +function is_some_comments(comment) { + // multiline comment + return comment.type == "comment2" && /@preserve|@license|@cc_on/i.test(comment.value); +} + +function OutputStream(options) { + + var readonly = !options; + options = defaults(options, { + ascii_only : false, + beautify : false, + bracketize : false, + comments : false, + ecma : 5, + ie8 : false, + indent_level : 4, + indent_start : 0, + inline_script : true, + keep_quoted_props: false, + max_line_len : false, + preamble : null, + preserve_line : false, + quote_keys : false, + quote_style : 0, + safari10 : false, + semicolons : true, + shebang : true, + shorthand : undefined, + source_map : null, + webkit : false, + width : 80, + wrap_iife : false, + }, true); + + if (options.shorthand === undefined) + options.shorthand = options.ecma > 5; + + // Convert comment option to RegExp if neccessary and set up comments filter + var comment_filter = return_false; // Default case, throw all comments away + if (options.comments) { + var comments = options.comments; + if (typeof options.comments === "string" && /^\/.*\/[a-zA-Z]*$/.test(options.comments)) { + var regex_pos = options.comments.lastIndexOf("/"); + comments = new RegExp( + options.comments.substr(1, regex_pos - 1), + options.comments.substr(regex_pos + 1) + ); + } + if (comments instanceof RegExp) { + comment_filter = function(comment) { + return comment.type != "comment5" && comments.test(comment.value); + }; + } + else if (typeof comments === "function") { + comment_filter = function(comment) { + return comment.type != "comment5" && comments(this, comment); + }; + } + else if (comments === "some") { + comment_filter = is_some_comments; + } else { // NOTE includes "all" option + comment_filter = return_true; + } + } + + var indentation = 0; + var current_col = 0; + var current_line = 1; + var current_pos = 0; + var OUTPUT = ""; + + var to_utf8 = options.ascii_only ? function(str, identifier) { + if (options.ecma >= 6) { + str = str.replace(/[\ud800-\udbff][\udc00-\udfff]/g, function(ch) { + var code = get_full_char_code(ch, 0).toString(16); + return "\\u{" + code + "}"; + }); + } + return str.replace(/[\u0000-\u001f\u007f-\uffff]/g, function(ch) { + var code = ch.charCodeAt(0).toString(16); + if (code.length <= 2 && !identifier) { + while (code.length < 2) code = "0" + code; + return "\\x" + code; + } else { + while (code.length < 4) code = "0" + code; + return "\\u" + code; + } + }); + } : function(str) { + var s = ""; + for (var i = 0, len = str.length; i < len; i++) { + if (is_surrogate_pair_head(str[i]) && !is_surrogate_pair_tail(str[i + 1]) + || is_surrogate_pair_tail(str[i]) && !is_surrogate_pair_head(str[i - 1])) { + s += "\\u" + str.charCodeAt(i).toString(16); + } else { + s += str[i]; + } + } + return s; + }; + + function make_string(str, quote) { + var dq = 0, sq = 0; + str = str.replace(/[\\\b\f\n\r\v\t\x22\x27\u2028\u2029\0\ufeff]/g, + function(s, i){ + switch (s) { + case '"': ++dq; return '"'; + case "'": ++sq; return "'"; + case "\\": return "\\\\"; + case "\n": return "\\n"; + case "\r": return "\\r"; + case "\t": return "\\t"; + case "\b": return "\\b"; + case "\f": return "\\f"; + case "\x0B": return options.ie8 ? "\\x0B" : "\\v"; + case "\u2028": return "\\u2028"; + case "\u2029": return "\\u2029"; + case "\ufeff": return "\\ufeff"; + case "\0": + return /[0-9]/.test(get_full_char(str, i+1)) ? "\\x00" : "\\0"; + } + return s; + }); + function quote_single() { + return "'" + str.replace(/\x27/g, "\\'") + "'"; + } + function quote_double() { + return '"' + str.replace(/\x22/g, '\\"') + '"'; + } + function quote_template() { + return '`' + str.replace(/`/g, '\\`') + '`'; + } + str = to_utf8(str); + if (quote === "`") return quote_template(); + switch (options.quote_style) { + case 1: + return quote_single(); + case 2: + return quote_double(); + case 3: + return quote == "'" ? quote_single() : quote_double(); + default: + return dq > sq ? quote_single() : quote_double(); + } + }; + + function encode_string(str, quote) { + var ret = make_string(str, quote); + if (options.inline_script) { + ret = ret.replace(/<\x2fscript([>\/\t\n\f\r ])/gi, "<\\/script$1"); + ret = ret.replace(/\x3c!--/g, "\\x3c!--"); + ret = ret.replace(/--\x3e/g, "--\\x3e"); + } + return ret; + }; + + function make_name(name) { + name = name.toString(); + name = to_utf8(name, true); + return name; + }; + + function make_indent(back) { + return repeat_string(" ", options.indent_start + indentation - back * options.indent_level); + }; + + /* -----[ beautification/minification ]----- */ + + var might_need_space = false; + var might_need_semicolon = false; + var might_add_newline = 0; + var need_newline_indented = false; + var need_space = false; + var newline_insert = -1; + var last = ""; + var mapping_token, mapping_name, mappings = options.source_map && []; + + var do_add_mapping = mappings ? function() { + mappings.forEach(function(mapping) { + try { + options.source_map.add( + mapping.token.file, + mapping.line, mapping.col, + mapping.token.line, mapping.token.col, + !mapping.name && mapping.token.type == "name" ? mapping.token.value : mapping.name + ); + } catch(ex) { + AST_Node.warn("Couldn't figure out mapping for {file}:{line},{col} → {cline},{ccol} [{name}]", { + file: mapping.token.file, + line: mapping.token.line, + col: mapping.token.col, + cline: mapping.line, + ccol: mapping.col, + name: mapping.name || "" + }) + } + }); + mappings = []; + } : noop; + + var ensure_line_len = options.max_line_len ? function() { + if (current_col > options.max_line_len) { + if (might_add_newline) { + var left = OUTPUT.slice(0, might_add_newline); + var right = OUTPUT.slice(might_add_newline); + if (mappings) { + var delta = right.length - current_col; + mappings.forEach(function(mapping) { + mapping.line++; + mapping.col += delta; + }); + } + OUTPUT = left + "\n" + right; + current_line++; + current_pos++; + current_col = right.length; + } + if (current_col > options.max_line_len) { + AST_Node.warn("Output exceeds {max_line_len} characters", options); + } + } + if (might_add_newline) { + might_add_newline = 0; + do_add_mapping(); + } + } : noop; + + var requireSemicolonChars = makePredicate("( [ + * / - , . `"); + + function print(str) { + str = String(str); + var ch = get_full_char(str, 0); + var prev = get_full_char(last, last.length - 1); + if (need_newline_indented && ch) { + need_newline_indented = false; + if (ch != "\n") { + print("\n"); + indent(); + } + } + if (need_space && ch) { + need_space = false; + if (!/[\s;})]/.test(ch)) { + space(); + } + } + newline_insert = -1; + var prev = last.charAt(last.length - 1); + if (might_need_semicolon) { + might_need_semicolon = false; + + if (prev == ":" && ch == "}" || (!ch || ";}".indexOf(ch) < 0) && prev != ";") { + if (options.semicolons || requireSemicolonChars(ch)) { + OUTPUT += ";"; + current_col++; + current_pos++; + } else { + ensure_line_len(); + OUTPUT += "\n"; + current_pos++; + current_line++; + current_col = 0; + + if (/^\s+$/.test(str)) { + // reset the semicolon flag, since we didn't print one + // now and might still have to later + might_need_semicolon = true; + } + } + + if (!options.beautify) + might_need_space = false; + } + } + + if (!options.beautify && options.preserve_line && stack[stack.length - 1]) { + var target_line = stack[stack.length - 1].start.line; + while (current_line < target_line) { + ensure_line_len(); + OUTPUT += "\n"; + current_pos++; + current_line++; + current_col = 0; + might_need_space = false; + } + } + + if (might_need_space) { + if ((is_identifier_char(prev) + && (is_identifier_char(ch) || ch == "\\")) + || (ch == "/" && ch == prev) + || ((ch == "+" || ch == "-") && ch == last)) + { + OUTPUT += " "; + current_col++; + current_pos++; + } + might_need_space = false; + } + + if (mapping_token) { + mappings.push({ + token: mapping_token, + name: mapping_name, + line: current_line, + col: current_col + }); + mapping_token = false; + if (!might_add_newline) do_add_mapping(); + } + + OUTPUT += str; + current_pos += str.length; + var a = str.split(/\r?\n/), n = a.length - 1; + current_line += n; + current_col += a[0].length; + if (n > 0) { + ensure_line_len(); + current_col = a[n].length; + } + last = str; + }; + + var star = function(){ + print("*"); + } + + var space = options.beautify ? function() { + print(" "); + } : function() { + might_need_space = true; + }; + + var indent = options.beautify ? function(half) { + if (options.beautify) { + print(make_indent(half ? 0.5 : 0)); + } + } : noop; + + var with_indent = options.beautify ? function(col, cont) { + if (col === true) col = next_indent(); + var save_indentation = indentation; + indentation = col; + var ret = cont(); + indentation = save_indentation; + return ret; + } : function(col, cont) { return cont() }; + + var newline = options.beautify ? function() { + if (newline_insert < 0) return print("\n"); + if (OUTPUT[newline_insert] != "\n") { + OUTPUT = OUTPUT.slice(0, newline_insert) + "\n" + OUTPUT.slice(newline_insert); + current_pos++; + current_line++; + } + newline_insert++; + } : options.max_line_len ? function() { + ensure_line_len(); + might_add_newline = OUTPUT.length; + } : noop; + + var semicolon = options.beautify ? function() { + print(";"); + } : function() { + might_need_semicolon = true; + }; + + function force_semicolon() { + might_need_semicolon = false; + print(";"); + }; + + function next_indent() { + return indentation + options.indent_level; + }; + + function with_block(cont) { + var ret; + print("{"); + newline(); + with_indent(next_indent(), function(){ + ret = cont(); + }); + indent(); + print("}"); + return ret; + }; + + function with_parens(cont) { + print("("); + //XXX: still nice to have that for argument lists + //var ret = with_indent(current_col, cont); + var ret = cont(); + print(")"); + return ret; + }; + + function with_square(cont) { + print("["); + //var ret = with_indent(current_col, cont); + var ret = cont(); + print("]"); + return ret; + }; + + function comma() { + print(","); + space(); + }; + + function colon() { + print(":"); + space(); + }; + + var add_mapping = mappings ? function(token, name) { + mapping_token = token; + mapping_name = name; + } : noop; + + function get() { + if (might_add_newline) { + ensure_line_len(); + } + return OUTPUT; + }; + + function has_nlb() { + var index = OUTPUT.lastIndexOf("\n"); + return /^ *$/.test(OUTPUT.slice(index + 1)); + } + + function prepend_comments(node) { + var self = this; + var start = node.start; + if (!start) return; + if (start.comments_before && start.comments_before._dumped === self) return; + var comments = start.comments_before; + if (!comments) { + comments = start.comments_before = []; + } + comments._dumped = self; + + if (node instanceof AST_Exit && node.value) { + var tw = new TreeWalker(function(node) { + var parent = tw.parent(); + if (parent instanceof AST_Exit + || parent instanceof AST_Binary && parent.left === node + || parent.TYPE == "Call" && parent.expression === node + || parent instanceof AST_Conditional && parent.condition === node + || parent instanceof AST_Dot && parent.expression === node + || parent instanceof AST_Sequence && parent.expressions[0] === node + || parent instanceof AST_Sub && parent.expression === node + || parent instanceof AST_UnaryPostfix) { + if (!node.start) return; + var text = node.start.comments_before; + if (text && text._dumped !== self) { + text._dumped = self; + comments = comments.concat(text); + } + } else { + return true; + } + }); + tw.push(node); + node.value.walk(tw); + } + + if (current_pos == 0) { + if (comments.length > 0 && options.shebang && comments[0].type == "comment5") { + print("#!" + comments.shift().value + "\n"); + indent(); + } + var preamble = options.preamble; + if (preamble) { + print(preamble.replace(/\r\n?|[\n\u2028\u2029]|\s*$/g, "\n")); + } + } + + comments = comments.filter(comment_filter, node); + if (comments.length == 0) return; + var last_nlb = has_nlb(); + comments.forEach(function(c, i) { + if (!last_nlb) { + if (c.nlb) { + 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 }, + newline : newline, + print : print, + star : star, + 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); + }, + print_template_string_chars: function(str) { + var encoded = encode_string(str, '`').replace(/\${/g, "\\${"); + return print(encoded.substr(1, encoded.length - 2)); + }, + 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 : function() { return 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 (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(); + return p instanceof AST_Call && p.expression === this; + } + + return false; + }); + + PARENS(AST_Arrow, function(output){ + var p = output.parent(); + return p instanceof AST_PropAccess && p.expression === this; + }); + + // same goes for an object literal, because otherwise it would be + // interpreted as a block of code. + PARENS([ AST_ClassExpression, AST_Object ], first_in_statement); + + PARENS(AST_Unary, function(output){ + var p = output.parent(); + return p instanceof AST_PropAccess && p.expression === this + || p instanceof AST_Call && p.expression === this + || p instanceof AST_Binary + && p.operator === "**" + && this instanceof AST_UnaryPrefix + && p.left === this + && this.operator !== "++" + && this.operator !== "--"; + }); + + PARENS(AST_Await, function(output){ + var p = output.parent(); + return p instanceof AST_PropAccess && p.expression === this + || p instanceof AST_Call && p.expression === this + || output.option("safari10") && p instanceof AST_UnaryPrefix; + }); + + 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) */ + || p instanceof AST_Arrow // x => (x, x) + || p instanceof AST_DefaultAssign // x => (x = (0, function(){})) + || p instanceof AST_Expansion // [...(a, b)] + || p instanceof AST_ForOf && this === p.object // for (e of (foo, bar)) {} + || p instanceof AST_Yield // yield (foo, bar) + ; + }); + + 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_Yield, function(output){ + var p = output.parent(); + // (yield 1) + (yield 2) + // a = yield 3 + if (p instanceof AST_Binary && p.operator !== "=") + return true; + // (yield 1)() + // new (yield 1)() + if (p instanceof AST_Call && p.expression === this) + return true; + // (yield 1) ? yield 2 : yield 3 + if (p instanceof AST_Conditional && p.condition === this) + return true; + // -(yield 4) + if (p instanceof AST_Unary) + return true; + // (yield x).foo + // (yield x)['foo'] + if (p instanceof AST_PropAccess && p.expression === this) + 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(), p1; + if (p instanceof AST_New && p.expression === this) + return true; + + // workaround for Safari bug. + // https://bugs.webkit.org/show_bug.cgi?id=123506 + return this.expression instanceof AST_Function + && p instanceof AST_PropAccess + && p.expression === this + && (p1 = output.parent(1)) instanceof AST_Assign + && p1.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; + // ({a, b} = {a: 1, b: 2}), a destructuring assignment + if (this instanceof AST_Assign && this.left instanceof AST_Destructuring && this.left.is_array === false) + return true; + }); + + /* -----[ PRINTERS ]----- */ + + DEFPRINT(AST_Directive, function(self, output){ + output.print_string(self.value, self.quote); + output.semicolon(); + }); + + DEFPRINT(AST_Expansion, function (self, output) { + output.print('...'); + self.expression.print(output); + }); + + DEFPRINT(AST_Destructuring, function (self, output) { + output.print(self.is_array ? "[" : "{"); + var len = self.names.length; + self.names.forEach(function (name, i) { + if (i > 0) output.comma(); + name.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 && name instanceof AST_Hole) output.comma(); + }); + output.print(self.is_array ? "]" : "}"); + }); + + 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_bracketed(self, output, allow_directives) { + if (self.body.length > 0) { + output.with_block(function() { + display_body(self.body, false, output, allow_directives); + }); + } else { + output.print("{"); + output.with_indent(output.next_indent(), function() { + output.append_comments(self, true); + }); + output.print("}"); + } + }; + DEFPRINT(AST_BlockStatement, function(self, output){ + print_bracketed(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(self instanceof AST_ForOf ? "of" : "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) { + if (self.async) { + output.print("async"); + output.space(); + } + output.print("function"); + if (self.is_generator) { + output.star(); + } + if (self.name) { + output.space(); + } + } + if (self.name instanceof AST_Symbol) { + self.name.print(output); + } else if (nokeyword && self.name instanceof AST_Node) { + output.with_square(function() { + self.name.print(output); // Computed method name + }); + } + output.with_parens(function(){ + self.argnames.forEach(function(arg, i){ + if (i) output.comma(); + arg.print(output); + }); + }); + output.space(); + print_bracketed(self, output, true); + }); + DEFPRINT(AST_Lambda, function(self, output){ + self._do_print(output); + }); + + DEFPRINT(AST_PrefixedTemplateString, function(self, output) { + self.prefix.print(output); + self.template_string.print(output); + }); + DEFPRINT(AST_TemplateString, function(self, output) { + var is_tagged = output.parent() instanceof AST_PrefixedTemplateString; + + output.print("`"); + for (var i = 0; i < self.segments.length; i++) { + if (!(self.segments[i] instanceof AST_TemplateSegment)) { + output.print("${"); + self.segments[i].print(output); + output.print("}"); + } else if (is_tagged) { + output.print(self.segments[i].raw); + } else { + output.print_template_string_chars(self.segments[i].value); + } + } + output.print("`"); + }); + + AST_Arrow.DEFMETHOD("_do_print", function(output){ + var self = this; + var parent = output.parent(); + var needs_parens = parent instanceof AST_Binary || + parent instanceof AST_Unary || + (parent instanceof AST_Call && self === parent.expression); + if (needs_parens) { output.print("(") } + if (self.async) { + output.print("async"); + output.space(); + } + if (self.argnames.length === 1 && self.argnames[0] instanceof AST_Symbol) { + self.argnames[0].print(output); + } else { + output.with_parens(function(){ + self.argnames.forEach(function(arg, i){ + if (i) output.comma(); + arg.print(output); + }); + }); + } + output.space(); + output.print('=>'); + output.space(); + if (self.body instanceof AST_Node) { + self.body.print(output); + } else { + print_bracketed(self, output); + } + if (needs_parens) { output.print(")") } + }); + + /* -----[ exits ]----- */ + AST_Exit.DEFMETHOD("_do_print", function(output, kind){ + output.print(kind); + if (this.value) { + output.space(); + this.value.print(output); + } + output.semicolon(); + }); + DEFPRINT(AST_Return, function(self, output){ + self._do_print(output, "return"); + }); + DEFPRINT(AST_Throw, function(self, output){ + self._do_print(output, "throw"); + }); + + /* -----[ yield ]----- */ + + DEFPRINT(AST_Yield, function(self, output){ + var star = self.is_star ? "*" : ""; + output.print("yield" + star); + if (self.expression) { + output.space(); + self.expression.print(output); + } + }); + + DEFPRINT(AST_Await, function(self, output){ + output.print("await"); + output.space(); + var e = self.expression; + var parens = !( + e instanceof AST_Call + || e instanceof AST_SymbolRef + || e instanceof AST_PropAccess + || e instanceof AST_Unary + || e instanceof AST_Constant + ); + if (parens) output.print("("); + self.expression.print(output); + if (parens) output.print(")"); + }); + + /* -----[ loop control ]----- */ + AST_LoopControl.DEFMETHOD("_do_print", function(output, kind){ + output.print(kind); + if (this.label) { + output.space(); + this.label.print(output); + } + output.semicolon(); + }); + DEFPRINT(AST_Break, function(self, output){ + self._do_print(output, "break"); + }); + DEFPRINT(AST_Continue, function(self, output){ + self._do_print(output, "continue"); + }); + + /* -----[ if ]----- */ + function make_then(self, output) { + var b = self.body; + if (output.option("bracketize") + || 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 brackets 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) output.print("{}"); + 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_bracketed(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_bracketed(self, output); + }); + DEFPRINT(AST_Finally, function(self, output){ + output.print("finally"); + output.space(); + print_bracketed(self, output); + }); + + /* -----[ var/const ]----- */ + AST_Definitions.DEFMETHOD("_do_print", function(output, kind){ + output.print(kind); + output.space(); + this.definitions.forEach(function(def, i){ + if (i) output.comma(); + def.print(output); + }); + var p = output.parent(); + var in_for = p instanceof AST_For || p instanceof AST_ForIn; + var avoid_semicolon = in_for && p.init === this; + if (!avoid_semicolon) + output.semicolon(); + }); + DEFPRINT(AST_Let, function(self, output){ + self._do_print(output, "let"); + }); + DEFPRINT(AST_Var, function(self, output){ + self._do_print(output, "var"); + }); + DEFPRINT(AST_Const, function(self, output){ + self._do_print(output, "const"); + }); + DEFPRINT(AST_Import, function(self, output) { + output.print("import"); + output.space(); + if (self.imported_name) { + self.imported_name.print(output); + } + if (self.imported_name && self.imported_names) { + output.print(","); + output.space(); + } + if (self.imported_names) { + if (self.imported_names.length === 1 && self.imported_names[0].foreign_name.name === "*") { + self.imported_names[0].print(output); + } else { + output.print("{"); + self.imported_names.forEach(function (name_import, i) { + output.space(); + name_import.print(output); + if (i < self.imported_names.length - 1) { + output.print(","); + } + }); + output.space(); + output.print("}"); + } + } + if (self.imported_name || self.imported_names) { + output.space(); + output.print("from") + output.space(); + } + self.module_name.print(output); + output.semicolon(); + }); + + DEFPRINT(AST_NameMapping, function(self, output) { + var is_import = output.parent() instanceof AST_Import; + var definition = self.name.definition(); + var names_are_different = + (definition && definition.mangled_name || self.name.name) !== + self.foreign_name.name; + if (names_are_different) { + if (is_import) { + output.print(self.foreign_name.name); + } else { + self.name.print(output); + } + output.space(); + output.print("as"); + output.space(); + if (is_import) { + self.name.print(output); + } else { + output.print(self.foreign_name.name); + } + } else { + self.name.print(output); + } + }); + + DEFPRINT(AST_Export, function(self, output) { + output.print("export"); + output.space(); + if (self.is_default) { + output.print("default"); + output.space(); + } + if (self.exported_names) { + if (self.exported_names.length === 1 && self.exported_names[0].name.name === "*") { + self.exported_names[0].print(output); + } else { + output.print("{"); + self.exported_names.forEach(function(name_export, i) { + output.space(); + name_export.print(output); + if (i < self.exported_names.length - 1) { + output.print(","); + } + }); + output.space(); + output.print("}"); + } + } + else if (self.exported_value) { + self.exported_value.print(output); + } else if (self.exported_definition) { + self.exported_definition.print(output); + if (self.exported_definition instanceof AST_Definitions) return; + } + if (self.module_name) { + output.space(); + output.print("from"); + output.space(); + self.module_name.print(output); + } + 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); + }); + + AST_Sequence.DEFMETHOD("_do_print", function(output){ + this.expressions.forEach(function(node, index) { + if (index > 0) { + output.comma(); + if (output.should_break()) { + output.newline(); + output.indent(); + } + } + node.print(output); + }); + }); + DEFPRINT(AST_Sequence, function(self, output){ + self._do_print(output); + // var p = output.parent(); + // if (p instanceof AST_Statement) { + // output.with_indent(output.next_indent(), function(){ + // self._do_print(output); + // }); + // } else { + // self._do_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