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Diffstat (limited to 'node_modules/uglify-js/lib/output.js')
| -rw-r--r-- | node_modules/uglify-js/lib/output.js | 1424 |
1 files changed, 1424 insertions, 0 deletions
diff --git a/node_modules/uglify-js/lib/output.js b/node_modules/uglify-js/lib/output.js new file mode 100644 index 000000000..9ac50c08a --- /dev/null +++ b/node_modules/uglify-js/lib/output.js @@ -0,0 +1,1424 @@ +/*********************************************************************** + + A JavaScript tokenizer / parser / beautifier / compressor. + https://github.com/mishoo/UglifyJS2 + + -------------------------------- (C) --------------------------------- + + Author: Mihai Bazon + <mihai.bazon@gmail.com> + http://mihai.bazon.net/blog + + Distributed under the BSD license: + + Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com> + + 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) { + + options = defaults(options, { + ascii_only : false, + beautify : false, + bracketize : false, + comments : 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, + screw_ie8 : true, + semicolons : true, + shebang : true, + source_map : null, + space_colon : true, + unescape_regexps : false, + width : 80, + wrap_iife : false, + }, true); + + // 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 = ""; + + function to_ascii(str, identifier) { + 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 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.screw_ie8 ? "\\v" : "\\x0B"; + case "\u2028": return "\\u2028"; + case "\u2029": return "\\u2029"; + case "\ufeff": return "\\ufeff"; + case "\0": + return /[0-7]/.test(str.charAt(i+1)) ? "\\x00" : "\\0"; + } + return s; + }); + function quote_single() { + return "'" + str.replace(/\x27/g, "\\'") + "'"; + } + function quote_double() { + return '"' + str.replace(/\x22/g, '\\"') + '"'; + } + if (options.ascii_only) str = to_ascii(str); + 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$1"); + ret = ret.replace(/\x3c!--/g, "\\x3c!--"); + ret = ret.replace(/--\x3e/g, "--\\x3e"); + } + return ret; + }; + + function make_name(name) { + name = name.toString(); + if (options.ascii_only) + name = to_ascii(name, true); + return name; + }; + + function make_indent(back) { + return repeat_string(" ", options.indent_start + indentation - back * options.indent_level); + }; + + /* -----[ beautification/minification ]----- */ + + var might_need_space = false; + var might_need_semicolon = false; + var might_add_newline = 0; + var last = null; + + function last_char() { + return last.charAt(last.length - 1); + }; + + var ensure_line_len = options.max_line_len ? function() { + if (current_col > options.max_line_len) { + if (might_add_newline) { + var left = OUTPUT.slice(0, might_add_newline); + var right = OUTPUT.slice(might_add_newline); + OUTPUT = left + "\n" + right; + current_line++; + current_pos++; + current_col = right.length; + } + if (current_col > options.max_line_len) { + AST_Node.warn("Output exceeds {max_line_len} characters", options); + } + } + might_add_newline = 0; + } : noop; + + var requireSemicolonChars = makePredicate("( [ + * / - , ."); + + function print(str) { + str = String(str); + var ch = str.charAt(0); + if (might_need_semicolon) { + might_need_semicolon = false; + + if ((!ch || ";}".indexOf(ch) < 0) && !/[;]$/.test(last)) { + 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) { + var prev = last_char(); + 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; + } + 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 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() { + print("\n"); + } : 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(":"); + if (options.space_colon) space(); + }; + + var add_mapping = options.source_map ? function(token, name) { + try { + if (token) options.source_map.add( + token.file || "?", + current_line, current_col, + token.line, token.col, + (!name && token.type == "name") ? token.value : name + ); + } catch(ex) { + AST_Node.warn("Couldn't figure out mapping for {file}:{line},{col} → {cline},{ccol} [{name}]", { + file: token.file, + line: token.line, + col: token.col, + cline: current_line, + ccol: current_col, + name: name || "" + }) + } + } : noop; + + function get() { + if (might_add_newline) { + ensure_line_len(); + } + return OUTPUT; + }; + + 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, + space : space, + comma : comma, + colon : colon, + last : function() { return last }, + semicolon : semicolon, + force_semicolon : force_semicolon, + to_ascii : to_ascii, + 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] }, + comment_filter : comment_filter, + 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 use_asm = false; + var in_directive = false; + + AST_Node.DEFMETHOD("print", function(stream, force_parens){ + var self = this, generator = self._codegen, prev_use_asm = use_asm; + if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope) { + use_asm = true; + } + function doit() { + self.add_comments(stream); + self.add_source_map(stream); + generator(self, stream); + } + stream.push_node(self); + if (force_parens || self.needs_parens(stream)) { + stream.with_parens(doit); + } else { + doit(); + } + stream.pop_node(); + if (self instanceof AST_Scope) { + use_asm = prev_use_asm; + } + }); + + AST_Node.DEFMETHOD("print_to_string", function(options){ + var s = OutputStream(options); + if (!options) s._readonly = true; + this.print(s); + return s.get(); + }); + + /* -----[ comments ]----- */ + + AST_Node.DEFMETHOD("add_comments", function(output){ + if (output._readonly) return; + var self = this; + var start = self.start; + if (start && !start._comments_dumped) { + start._comments_dumped = true; + var comments = start.comments_before || []; + + // XXX: ugly fix for https://github.com/mishoo/UglifyJS2/issues/112 + // and https://github.com/mishoo/UglifyJS2/issues/372 + if (self instanceof AST_Exit && self.value) { + self.value.walk(new TreeWalker(function(node){ + if (node.start && node.start.comments_before) { + comments = comments.concat(node.start.comments_before); + node.start.comments_before = []; + } + if (node instanceof AST_Function || + node instanceof AST_Array || + node instanceof AST_Object) + { + return true; // don't go inside. + } + })); + } + + if (output.pos() == 0) { + if (comments.length > 0 && output.option("shebang") && comments[0].type == "comment5") { + output.print("#!" + comments.shift().value + "\n"); + output.indent(); + } + var preamble = output.option("preamble"); + if (preamble) { + output.print(preamble.replace(/\r\n?|[\n\u2028\u2029]|\s*$/g, "\n")); + } + } + + comments = comments.filter(output.comment_filter, self); + + // Keep single line comments after nlb, after nlb + if (!output.option("beautify") && comments.length > 0 && + /comment[134]/.test(comments[0].type) && + output.col() !== 0 && comments[0].nlb) + { + output.print("\n"); + } + + comments.forEach(function(c){ + if (/comment[134]/.test(c.type)) { + output.print("//" + c.value + "\n"); + output.indent(); + } + else if (c.type == "comment2") { + output.print("/*" + c.value + "*/"); + if (start.nlb) { + output.print("\n"); + output.indent(); + } else { + output.space(); + } + } + }); + } + }); + + /* -----[ 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, function(){ + 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('wrap_iife')) { + var p = output.parent(); + return p instanceof AST_Call && p.expression === this; + } + + return false; + }); + + // same goes for an object literal, because otherwise it would be + // interpreted as a block of code. + PARENS(AST_Object, function(output){ + return 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_Seq, 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. + try { + this.walk(new TreeWalker(function(node){ + if (node instanceof AST_Call) throw p; + })); + } catch(ex) { + if (ex !== p) throw ex; + return true; + } + } + }); + + 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; + }); + + /* -----[ 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_bracketed(body, output, allow_directives) { + if (body.length > 0) output.with_block(function(){ + display_body(body, false, output, allow_directives); + }); + else output.print("{}"); + }; + DEFPRINT(AST_BlockStatement, function(self, output){ + print_bracketed(self.body, 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_bracketed(self.body, output, true); + }); + DEFPRINT(AST_Lambda, function(self, output){ + self._do_print(output); + }); + + /* -----[ 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"); + }); + + /* -----[ 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("screw_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.body, 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.body, output); + }); + DEFPRINT(AST_Finally, function(self, output){ + output.print("finally"); + output.space(); + print_bracketed(self.body, 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_Var, function(self, output){ + self._do_print(output, "var"); + }); + DEFPRINT(AST_Const, function(self, output){ + self._do_print(output, "const"); + }); + + function parenthesize_for_noin(node, output, noin) { + if (!noin) node.print(output); + else try { + // need to take some precautions here: + // https://github.com/mishoo/UglifyJS2/issues/60 + node.walk(new TreeWalker(function(node){ + if (node instanceof AST_Binary && node.operator == "in") + throw output; + })); + node.print(output); + } catch(ex) { + if (ex !== output) throw ex; + node.print(output, true); + } + }; + + 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; + 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_Seq.DEFMETHOD("_do_print", function(output){ + this.car.print(output); + if (this.cdr) { + output.comma(); + if (output.should_break()) { + output.newline(); + output.indent(); + } + this.cdr.print(output); + } + }); + DEFPRINT(AST_Seq, 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); + 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(self.property); + }); + 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 output.print("{}"); + }); + DEFPRINT(AST_ObjectKeyVal, function(self, output){ + var key = self.key; + var quote = self.quote; + if (output.option("quote_keys")) { + output.print_string(key + ""); + } else if ((typeof key == "number" + || !output.option("beautify") + && +key + "" == key) + && parseFloat(key) >= 0) { + output.print(make_num(key)); + } else if (RESERVED_WORDS(key) ? output.option("screw_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); + } + output.colon(); + self.value.print(output); + }); + DEFPRINT(AST_ObjectSetter, function(self, output){ + output.print("set"); + output.space(); + self.key.print(output); + self.value._do_print(output, true); + }); + DEFPRINT(AST_ObjectGetter, function(self, output){ + output.print("get"); + output.space(); + self.key.print(output); + self.value._do_print(output, true); + }); + 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())); + } + }); + + function regexp_safe_literal(code) { + return [ + 0x5c , // \ + 0x2f , // / + 0x2e , // . + 0x2b , // + + 0x2a , // * + 0x3f , // ? + 0x28 , // ( + 0x29 , // ) + 0x5b , // [ + 0x5d , // ] + 0x7b , // { + 0x7d , // } + 0x24 , // $ + 0x5e , // ^ + 0x3a , // : + 0x7c , // | + 0x21 , // ! + 0x0a , // \n + 0x0d , // \r + 0x00 , // \0 + 0xfeff , // Unicode BOM + 0x2028 , // unicode "line separator" + 0x2029 , // unicode "paragraph separator" + ].indexOf(code) < 0; + }; + + DEFPRINT(AST_RegExp, function(self, output){ + var str = self.getValue().toString(); + if (output.option("ascii_only")) { + str = output.to_ascii(str); + } else if (output.option("unescape_regexps")) { + str = str.split("\\\\").map(function(str){ + return str.replace(/\\u[0-9a-fA-F]{4}|\\x[0-9a-fA-F]{2}/g, function(s){ + var code = parseInt(s.substr(2), 16); + return regexp_safe_literal(code) ? String.fromCharCode(code) : s; + }); + }).join("\\\\"); + } + 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("bracketize")) { + 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), a = [ str.replace(/^0\./, ".").replace('e+', 'e') ], m; + if (Math.floor(num) === num) { + if (num >= 0) { + a.push("0x" + num.toString(16).toLowerCase(), // probably pointless + "0" + num.toString(8)); // same. + } else { + a.push("-0x" + (-num).toString(16).toLowerCase(), // probably pointless + "-0" + (-num).toString(8)); // same. + } + if ((m = /^(.*?)(0+)$/.exec(num))) { + a.push(m[1] + "e" + m[2].length); + } + } else if ((m = /^0?\.(0+)(.*)$/.exec(num))) { + a.push(m[2] + "e-" + (m[1].length + m[2].length), + str.substr(str.indexOf("."))); + } + return best_of(a); + }; + + 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.DEFMETHOD("add_source_map", function(stream){ + generator(this, stream); + }); + }; + + // 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. + DEFMAP(AST_Node, noop); + + function basic_sourcemap_gen(self, output) { + output.add_mapping(self.start); + }; + + // XXX: I'm not exactly sure if we need it for all of these nodes, + // or if we should add even more. + + DEFMAP(AST_Directive, basic_sourcemap_gen); + DEFMAP(AST_Debugger, basic_sourcemap_gen); + DEFMAP(AST_Symbol, basic_sourcemap_gen); + DEFMAP(AST_Jump, basic_sourcemap_gen); + DEFMAP(AST_StatementWithBody, basic_sourcemap_gen); + DEFMAP(AST_LabeledStatement, noop); // since the label symbol will mark it + DEFMAP(AST_Lambda, basic_sourcemap_gen); + DEFMAP(AST_Switch, basic_sourcemap_gen); + DEFMAP(AST_SwitchBranch, basic_sourcemap_gen); + DEFMAP(AST_BlockStatement, basic_sourcemap_gen); + DEFMAP(AST_Toplevel, noop); + DEFMAP(AST_New, basic_sourcemap_gen); + DEFMAP(AST_Try, basic_sourcemap_gen); + DEFMAP(AST_Catch, basic_sourcemap_gen); + DEFMAP(AST_Finally, basic_sourcemap_gen); + DEFMAP(AST_Definitions, basic_sourcemap_gen); + DEFMAP(AST_Constant, basic_sourcemap_gen); + DEFMAP(AST_ObjectSetter, function(self, output){ + output.add_mapping(self.start, self.key.name); + }); + DEFMAP(AST_ObjectGetter, function(self, output){ + output.add_mapping(self.start, self.key.name); + }); + DEFMAP(AST_ObjectProperty, function(self, output){ + output.add_mapping(self.start, self.key); + }); + +})(); |