var KEYWORDS = array_to_hash([ "break", "case", "catch", "const", "continue", "debugger", "default", "delete", "do", "else", "finally", "for", "function", "if", "in", "instanceof", "new", "return", "switch", "throw", "try", "typeof", "var", "void", "while", "with" ]); var RESERVED_WORDS = array_to_hash([ "abstract", "boolean", "byte", "char", "class", "double", "enum", "export", "extends", "final", "float", "goto", "implements", "import", "int", "interface", "long", "native", "package", "private", "protected", "public", "short", "static", "super", "synchronized", "throws", "transient", "volatile" ]); var KEYWORDS_BEFORE_EXPRESSION = array_to_hash([ "return", "new", "delete", "throw", "else", "case" ]); var KEYWORDS_ATOM = array_to_hash([ "false", "null", "true" ]); var OPERATOR_CHARS = array_to_hash(characters("+-*&%=<>!?|~^")); var RE_HEX_NUMBER = /^0x[0-9a-f]+$/i; var RE_OCT_NUMBER = /^0[0-7]+$/; var RE_DEC_NUMBER = /^\d*\.?\d*(?:e[+-]?\d*(?:\d\.?|\.?\d)\d*)?$/i; var OPERATORS = array_to_hash([ "in", "instanceof", "typeof", "new", "void", "delete", "++", "--", "+", "-", "!", "~", "&", "|", "^", "*", "/", "%", ">>", "<<", ">>>", "<", ">", "<=", ">=", "==", "===", "!=", "!==", "?", "=", "+=", "-=", "/=", "*=", "%=", ">>=", "<<=", ">>>=", "|=", "^=", "&=", "&&", "||" ]); var WHITESPACE_CHARS = array_to_hash(characters(" \u00a0\n\r\t\f\u000b\u200b\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000")); var PUNC_BEFORE_EXPRESSION = array_to_hash(characters("[{(,.;:")); var PUNC_CHARS = array_to_hash(characters("[]{}(),;:")); var REGEXP_MODIFIERS = array_to_hash(characters("gmsiy")); /* -----[ Tokenizer ]----- */ // regexps adapted from http://xregexp.com/plugins/#unicode var UNICODE = { letter: new 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non_spacing_mark: new RegExp("[\\u0300-\\u036F\\u0483-\\u0487\\u0591-\\u05BD\\u05BF\\u05C1\\u05C2\\u05C4\\u05C5\\u05C7\\u0610-\\u061A\\u064B-\\u065E\\u0670\\u06D6-\\u06DC\\u06DF-\\u06E4\\u06E7\\u06E8\\u06EA-\\u06ED\\u0711\\u0730-\\u074A\\u07A6-\\u07B0\\u07EB-\\u07F3\\u0816-\\u0819\\u081B-\\u0823\\u0825-\\u0827\\u0829-\\u082D\\u0900-\\u0902\\u093C\\u0941-\\u0948\\u094D\\u0951-\\u0955\\u0962\\u0963\\u0981\\u09BC\\u09C1-\\u09C4\\u09CD\\u09E2\\u09E3\\u0A01\\u0A02\\u0A3C\\u0A41\\u0A42\\u0A47\\u0A48\\u0A4B-\\u0A4D\\u0A51\\u0A70\\u0A71\\u0A75\\u0A81\\u0A82\\u0ABC\\u0AC1-\\u0AC5\\u0AC7\\u0AC8\\u0ACD\\u0AE2\\u0AE3\\u0B01\\u0B3C\\u0B3F\\u0B41-\\u0B44\\u0B4D\\u0B56\\u0B62\\u0B63\\u0B82\\u0BC0\\u0BCD\\u0C3E-\\u0C40\\u0C46-\\u0C48\\u0C4A-\\u0C4D\\u0C55\\u0C56\\u0C62\\u0C63\\u0CBC\\u0CBF\\u0CC6\\u0CCC\\u0CCD\\u0CE2\\u0CE3\\u0D41-\\u0D44\\u0D4D\\u0D62\\u0D63\\u0DCA\\u0DD2-\\u0DD4\\u0DD6\\u0E31\\u0E34-\\u0E3A\\u0E47-\\u0E4E\\u0EB1\\u0EB4-\\u0EB9\\u0EBB\\u0EBC\\u0EC8-\\u0ECD\\u0F18\\u0F19\\u0F35\\u0F37\\u0F39\\u0F71-\\u0F7E\\u0F80-\\u0F84\\u0F86\\u0F87\\u0F90-\\u0F97\\u0F99-\\u0FBC\\u0FC6\\u102D-\\u1030\\u1032-\\u1037\\u1039\\u103A\\u103D\\u103E\\u1058\\u1059\\u105E-\\u1060\\u1071-\\u1074\\u1082\\u1085\\u1086\\u108D\\u109D\\u135F\\u1712-\\u1714\\u1732-\\u1734\\u1752\\u1753\\u1772\\u1773\\u17B7-\\u17BD\\u17C6\\u17C9-\\u17D3\\u17DD\\u180B-\\u180D\\u18A9\\u1920-\\u1922\\u1927\\u1928\\u1932\\u1939-\\u193B\\u1A17\\u1A18\\u1A56\\u1A58-\\u1A5E\\u1A60\\u1A62\\u1A65-\\u1A6C\\u1A73-\\u1A7C\\u1A7F\\u1B00-\\u1B03\\u1B34\\u1B36-\\u1B3A\\u1B3C\\u1B42\\u1B6B-\\u1B73\\u1B80\\u1B81\\u1BA2-\\u1BA5\\u1BA8\\u1BA9\\u1C2C-\\u1C33\\u1C36\\u1C37\\u1CD0-\\u1CD2\\u1CD4-\\u1CE0\\u1CE2-\\u1CE8\\u1CED\\u1DC0-\\u1DE6\\u1DFD-\\u1DFF\\u20D0-\\u20DC\\u20E1\\u20E5-\\u20F0\\u2CEF-\\u2CF1\\u2DE0-\\u2DFF\\u302A-\\u302F\\u3099\\u309A\\uA66F\\uA67C\\uA67D\\uA6F0\\uA6F1\\uA802\\uA806\\uA80B\\uA825\\uA826\\uA8C4\\uA8E0-\\uA8F1\\uA926-\\uA92D\\uA947-\\uA951\\uA980-\\uA982\\uA9B3\\uA9B6-\\uA9B9\\uA9BC\\uAA29-\\uAA2E\\uAA31\\uAA32\\uAA35\\uAA36\\uAA43\\uAA4C\\uAAB0\\uAAB2-\\uAAB4\\uAAB7\\uAAB8\\uAABE\\uAABF\\uAAC1\\uABE5\\uABE8\\uABED\\uFB1E\\uFE00-\\uFE0F\\uFE20-\\uFE26]"), space_combining_mark: new RegExp("[\\u0903\\u093E-\\u0940\\u0949-\\u094C\\u094E\\u0982\\u0983\\u09BE-\\u09C0\\u09C7\\u09C8\\u09CB\\u09CC\\u09D7\\u0A03\\u0A3E-\\u0A40\\u0A83\\u0ABE-\\u0AC0\\u0AC9\\u0ACB\\u0ACC\\u0B02\\u0B03\\u0B3E\\u0B40\\u0B47\\u0B48\\u0B4B\\u0B4C\\u0B57\\u0BBE\\u0BBF\\u0BC1\\u0BC2\\u0BC6-\\u0BC8\\u0BCA-\\u0BCC\\u0BD7\\u0C01-\\u0C03\\u0C41-\\u0C44\\u0C82\\u0C83\\u0CBE\\u0CC0-\\u0CC4\\u0CC7\\u0CC8\\u0CCA\\u0CCB\\u0CD5\\u0CD6\\u0D02\\u0D03\\u0D3E-\\u0D40\\u0D46-\\u0D48\\u0D4A-\\u0D4C\\u0D57\\u0D82\\u0D83\\u0DCF-\\u0DD1\\u0DD8-\\u0DDF\\u0DF2\\u0DF3\\u0F3E\\u0F3F\\u0F7F\\u102B\\u102C\\u1031\\u1038\\u103B\\u103C\\u1056\\u1057\\u1062-\\u1064\\u1067-\\u106D\\u1083\\u1084\\u1087-\\u108C\\u108F\\u109A-\\u109C\\u17B6\\u17BE-\\u17C5\\u17C7\\u17C8\\u1923-\\u1926\\u1929-\\u192B\\u1930\\u1931\\u1933-\\u1938\\u19B0-\\u19C0\\u19C8\\u19C9\\u1A19-\\u1A1B\\u1A55\\u1A57\\u1A61\\u1A63\\u1A64\\u1A6D-\\u1A72\\u1B04\\u1B35\\u1B3B\\u1B3D-\\u1B41\\u1B43\\u1B44\\u1B82\\u1BA1\\u1BA6\\u1BA7\\u1BAA\\u1C24-\\u1C2B\\u1C34\\u1C35\\u1CE1\\u1CF2\\uA823\\uA824\\uA827\\uA880\\uA881\\uA8B4-\\uA8C3\\uA952\\uA953\\uA983\\uA9B4\\uA9B5\\uA9BA\\uA9BB\\uA9BD-\\uA9C0\\uAA2F\\uAA30\\uAA33\\uAA34\\uAA4D\\uAA7B\\uABE3\\uABE4\\uABE6\\uABE7\\uABE9\\uABEA\\uABEC]"), connector_punctuation: new RegExp("[\\u005F\\u203F\\u2040\\u2054\\uFE33\\uFE34\\uFE4D-\\uFE4F\\uFF3F]") }; function is_letter(ch) { return UNICODE.letter.test(ch); }; function is_digit(ch) { ch = ch.charCodeAt(0); return ch >= 48 && ch <= 57; //XXX: find out if "UnicodeDigit" means something else than 0..9 }; function is_alphanumeric_char(ch) { return is_digit(ch) || is_letter(ch); }; function is_unicode_combining_mark(ch) { return UNICODE.non_spacing_mark.test(ch) || UNICODE.space_combining_mark.test(ch); }; function is_unicode_connector_punctuation(ch) { return UNICODE.connector_punctuation.test(ch); }; function is_identifier_start(ch) { return ch == "$" || ch == "_" || is_letter(ch); }; function is_identifier_char(ch) { return is_identifier_start(ch) || is_unicode_combining_mark(ch) || is_digit(ch) || is_unicode_connector_punctuation(ch) || ch == "\u200c" // zero-width non-joiner || ch == "\u200d" // zero-width joiner (in my ECMA-262 PDF, this is also 200c) ; }; function parse_js_number(num) { if (RE_HEX_NUMBER.test(num)) { return parseInt(num.substr(2), 16); } else if (RE_OCT_NUMBER.test(num)) { return parseInt(num.substr(1), 8); } else if (RE_DEC_NUMBER.test(num)) { return parseFloat(num); } }; function JS_Parse_Error(message, line, col, pos) { this.message = message; this.line = line + 1; this.col = col + 1; this.pos = pos + 1; this.stack = new Error().stack; }; JS_Parse_Error.prototype.toString = function() { return this.message + " (line: " + this.line + ", col: " + this.col + ", pos: " + this.pos + ")" + "\n\n" + this.stack; }; function js_error(message, line, col, pos) { console.log("***", message); console.log("*** LINE:", line, "COL:", col, "POS:", pos); throw new JS_Parse_Error(message, line, col, pos); }; function is_token(token, type, val) { return token.type == type && (val == null || token.value == val); }; var EX_EOF = {}; function tokenizer($TEXT) { var S = { text : $TEXT.replace(/\r\n?|[\n\u2028\u2029]/g, "\n").replace(/^\uFEFF/, ''), pos : 0, tokpos : 0, line : 0, tokline : 0, col : 0, tokcol : 0, newline_before : false, regex_allowed : false, comments_before : [] }; function peek() { return S.text.charAt(S.pos); }; function next(signal_eof, in_string) { var ch = S.text.charAt(S.pos++); if (signal_eof && !ch) throw EX_EOF; if (ch == "\n") { S.newline_before = S.newline_before || !in_string; ++S.line; S.col = 0; } else { ++S.col; } return ch; }; function eof() { return !S.peek(); }; function find(what, signal_eof) { var pos = S.text.indexOf(what, S.pos); if (signal_eof && pos == -1) throw EX_EOF; return pos; }; function start_token() { S.tokline = S.line; S.tokcol = S.col; S.tokpos = S.pos; }; function token(type, value, is_comment) { S.regex_allowed = ((type == "operator" && !HOP(UNARY_POSTFIX, value)) || (type == "keyword" && HOP(KEYWORDS_BEFORE_EXPRESSION, value)) || (type == "punc" && HOP(PUNC_BEFORE_EXPRESSION, value))); var ret = { type : type, value : value, line : S.tokline, col : S.tokcol, pos : S.tokpos, endpos : S.pos, nlb : S.newline_before }; if (!is_comment) { ret.comments_before = S.comments_before; S.comments_before = []; // make note of any newlines in the comments that came before for (var i = 0, len = ret.comments_before.length; i < len; i++) { ret.nlb = ret.nlb || ret.comments_before[i].nlb; } } S.newline_before = false; return new AST_Token(ret); }; function skip_whitespace() { while (HOP(WHITESPACE_CHARS, peek())) next(); }; function read_while(pred) { var ret = "", ch = peek(), i = 0; while (ch && pred(ch, i++)) { ret += next(); ch = peek(); } return ret; }; function parse_error(err) { js_error(err, S.tokline, S.tokcol, S.tokpos); }; function read_num(prefix) { var has_e = false, after_e = false, has_x = false, has_dot = prefix == "."; var num = read_while(function(ch, i){ if (ch == "x" || ch == "X") { if (has_x) return false; return has_x = true; } if (!has_x && (ch == "E" || ch == "e")) { if (has_e) return false; return has_e = after_e = true; } if (ch == "-") { if (after_e || (i == 0 && !prefix)) return true; return false; } if (ch == "+") return after_e; after_e = false; if (ch == ".") { if (!has_dot && !has_x && !has_e) return has_dot = true; return false; } return is_alphanumeric_char(ch); }); if (prefix) num = prefix + num; var valid = parse_js_number(num); if (!isNaN(valid)) { return token("num", valid); } else { parse_error("Invalid syntax: " + num); } }; function read_escaped_char(in_string) { var ch = next(true, in_string); switch (ch) { case "n" : return "\n"; case "r" : return "\r"; case "t" : return "\t"; case "b" : return "\b"; case "v" : return "\u000b"; case "f" : return "\f"; case "0" : return "\0"; case "x" : return String.fromCharCode(hex_bytes(2)); case "u" : return String.fromCharCode(hex_bytes(4)); case "\n": return ""; default : return ch; } }; function hex_bytes(n) { var num = 0; for (; n > 0; --n) { var digit = parseInt(next(true), 16); if (isNaN(digit)) parse_error("Invalid hex-character pattern in string"); num = (num << 4) | digit; } return num; }; function read_string() { return with_eof_error("Unterminated string constant", function(){ var quote = next(), ret = ""; for (;;) { var ch = next(true); if (ch == "\\") { // read OctalEscapeSequence (XXX: deprecated if "strict mode") // https://github.com/mishoo/UglifyJS/issues/178 var octal_len = 0, first = null; ch = read_while(function(ch){ if (ch >= "0" && ch <= "7") { if (!first) { first = ch; return ++octal_len; } else if (first <= "3" && octal_len <= 2) return ++octal_len; else if (first >= "4" && octal_len <= 1) return ++octal_len; } return false; }); if (octal_len > 0) ch = String.fromCharCode(parseInt(ch, 8)); else ch = read_escaped_char(true); } else if (ch == quote) break; ret += ch; } return token("string", ret); }); }; function read_line_comment() { next(); var i = find("\n"), ret; if (i == -1) { ret = S.text.substr(S.pos); S.pos = S.text.length; } else { ret = S.text.substring(S.pos, i); S.pos = i; } return token("comment1", ret, true); }; function read_multiline_comment() { next(); return with_eof_error("Unterminated multiline comment", function(){ var i = find("*/", true), text = S.text.substring(S.pos, i); S.pos = i + 2; S.line += text.split("\n").length - 1; S.newline_before = S.newline_before || text.indexOf("\n") >= 0; // https://github.com/mishoo/UglifyJS/issues/#issue/100 if (/^@cc_on/i.test(text)) { warn("WARNING: at line " + S.line); warn("*** Found \"conditional comment\": " + text); warn("*** UglifyJS DISCARDS ALL COMMENTS. This means your code might no longer work properly in Internet Explorer."); } return token("comment2", text, true); }); }; function read_name() { var backslash = false, name = "", ch, escaped = false, hex; while ((ch = peek()) != null) { if (!backslash) { if (ch == "\\") escaped = backslash = true, next(); else if (is_identifier_char(ch)) name += next(); else break; } else { if (ch != "u") parse_error("Expecting UnicodeEscapeSequence -- uXXXX"); ch = read_escaped_char(); if (!is_identifier_char(ch)) parse_error("Unicode char: " + ch.charCodeAt(0) + " is not valid in identifier"); name += ch; backslash = false; } } if (HOP(KEYWORDS, name) && escaped) { hex = name.charCodeAt(0).toString(16).toUpperCase(); name = "\\u" + "0000".substr(hex.length) + hex + name.slice(1); } return name; }; function read_regexp(regexp) { return with_eof_error("Unterminated regular expression", function(){ var prev_backslash = false, ch, in_class = false; while ((ch = next(true))) if (prev_backslash) { regexp += "\\" + ch; prev_backslash = false; } else if (ch == "[") { in_class = true; regexp += ch; } else if (ch == "]" && in_class) { in_class = false; regexp += ch; } else if (ch == "/" && !in_class) { break; } else if (ch == "\\") { prev_backslash = true; } else { regexp += ch; } var mods = read_name(); return token("regexp", [ regexp, mods ]); }); }; function read_operator(prefix) { function grow(op) { if (!peek()) return op; var bigger = op + peek(); if (HOP(OPERATORS, bigger)) { next(); return grow(bigger); } else { return op; } }; return token("operator", grow(prefix || next())); }; function handle_slash() { next(); var regex_allowed = S.regex_allowed; switch (peek()) { case "/": S.comments_before.push(read_line_comment()); S.regex_allowed = regex_allowed; return next_token(); case "*": S.comments_before.push(read_multiline_comment()); S.regex_allowed = regex_allowed; return next_token(); } return S.regex_allowed ? read_regexp("") : read_operator("/"); }; function handle_dot() { next(); return is_digit(peek()) ? read_num(".") : token("punc", "."); }; function read_word() { var word = read_name(); return HOP(KEYWORDS_ATOM, word) ? token("atom", word) : !HOP(KEYWORDS, word) ? token("name", word) : HOP(OPERATORS, word) ? token("operator", word) : token("keyword", word); }; function with_eof_error(eof_error, cont) { try { return cont(); } catch(ex) { if (ex === EX_EOF) parse_error(eof_error); else throw ex; } }; function next_token(force_regexp) { if (force_regexp != null) return read_regexp(force_regexp); skip_whitespace(); start_token(); var ch = peek(); if (!ch) return token("eof"); if (is_digit(ch)) return read_num(); if (ch == '"' || ch == "'") return read_string(); if (HOP(PUNC_CHARS, ch)) return token("punc", next()); if (ch == ".") return handle_dot(); if (ch == "/") return handle_slash(); if (HOP(OPERATOR_CHARS, ch)) return read_operator(); if (ch == "\\" || is_identifier_start(ch)) return read_word(); parse_error("Unexpected character '" + ch + "'"); }; next_token.context = function(nc) { if (nc) S = nc; return S; }; return next_token; }; /* -----[ Parser (constants) ]----- */ var UNARY_PREFIX = array_to_hash([ "typeof", "void", "delete", "--", "++", "!", "~", "-", "+" ]); var UNARY_POSTFIX = array_to_hash([ "--", "++" ]); var ASSIGNMENT = (function(a, ret, i){ while (i < a.length) { ret[a[i]] = a[i]; i++; } return ret; })( [ "=", "+=", "-=", "/=", "*=", "%=", ">>=", "<<=", ">>>=", "|=", "^=", "&=" ], {}, 0 ); var PRECEDENCE = (function(a, ret){ for (var i = 0, n = 1; i < a.length; ++i, ++n) { var b = a[i]; for (var j = 0; j < b.length; ++j) { ret[b[j]] = n; } } return ret; })( [ ["||"], ["&&"], ["|"], ["^"], ["&"], ["==", "===", "!=", "!=="], ["<", ">", "<=", ">=", "in", "instanceof"], [">>", "<<", ">>>"], ["+", "-"], ["*", "/", "%"] ], {} ); var STATEMENTS_WITH_LABELS = array_to_hash([ "for", "do", "while", "switch" ]); var ATOMIC_START_TOKEN = array_to_hash([ "atom", "num", "string", "regexp", "name" ]); /* -----[ Parser ]----- */ function parse($TEXT, exigent_mode) { var S = { input : typeof $TEXT == "string" ? tokenizer($TEXT, true) : $TEXT, token : null, prev : null, peeked : null, in_function : 0, in_directives : true, in_loop : 0, labels : [] }; S.token = next(); function is(type, value) { return is_token(S.token, type, value); }; function peek() { return S.peeked || (S.peeked = S.input()); }; function next() { S.prev = S.token; if (S.peeked) { S.token = S.peeked; S.peeked = null; } else { S.token = S.input(); } S.in_directives = S.in_directives && ( S.token.type == "string" || is("punc", ";") ); return S.token; }; function prev() { return S.prev; }; function croak(msg, line, col, pos) { var ctx = S.input.context(); js_error(msg, line != null ? line : ctx.tokline, col != null ? col : ctx.tokcol, pos != null ? pos : ctx.tokpos); }; function token_error(token, msg) { croak(msg, token.line, token.col); }; function unexpected(token) { if (token == null) token = S.token; token_error(token, "Unexpected token: " + token.type + " (" + token.value + ")"); }; function expect_token(type, val) { if (is(type, val)) { return next(); } token_error(S.token, "Unexpected token " + S.token.type + " «" + S.token.value + "»" + ", expected " + type + " «" + val + "»"); }; function expect(punc) { return expect_token("punc", punc); }; function can_insert_semicolon() { return !exigent_mode && ( S.token.nlb || is("eof") || is("punc", "}") ); }; function semicolon() { if (is("punc", ";")) next(); else if (!can_insert_semicolon()) unexpected(); }; function parenthesised() { return new AST_Parenthesized({ start : expect("("), expression : expression(), end : expect(")") }); }; function embed_tokens(parser) { return function() { var start = S.token; var expr = parser.apply(this, arguments); var end = prev(); expr.start = start; expr.end = end; return expr; }; }; var statement = embed_tokens(function() { if (is("operator", "/") || is("operator", "/=")) { S.peeked = null; S.token = S.input(S.token.value.substr(1)); // force regexp } switch (S.token.type) { case "string": var dir = S.in_directives, stat = simple_statement(); // XXXv2: decide how to fix directives // if (dir && stat instanceof AST_String && !is("punc", ",")) // return new AST_Directive({ value: stat.value }); return stat; case "num": case "regexp": case "operator": case "atom": return simple_statement(); case "name": return is_token(peek(), "punc", ":") ? labeled_statement() : simple_statement(); case "punc": switch (S.token.value) { case "{": return new AST_BlockStatement({ body: block_() }); case "[": case "(": return simple_statement(); case ";": next(); return new AST_EmptyStatement(); default: unexpected(); } case "keyword": switch (prog1(S.token.value, next)) { case "break": return break_cont(AST_Break); case "continue": return break_cont(AST_Continue); case "debugger": semicolon(); return new AST_Debugger(); case "do": return new AST_Do({ body : in_loop(statement), condition : (expect_token("keyword", "while"), prog1(parenthesised, semicolon)) }); case "while": return new AST_While({ condition : parenthesised(), body : in_loop(statement) }); case "for": return for_(); case "function": return function_(true); case "if": return if_(); case "return": if (S.in_function == 0) croak("'return' outside of function"); return new AST_Return({ value: ( is("punc", ";") ? (next(), null) : can_insert_semicolon() ? null : prog1(expression, semicolon) ) }); case "switch": return new AST_Switch({ expression : parenthesised(), body : switch_block_() }); case "throw": if (S.token.nlb) croak("Illegal newline after 'throw'"); return new AST_Throw({ value: prog1(expression, semicolon) }); case "try": return try_(); case "var": return prog1(var_, semicolon); case "const": return prog1(const_, semicolon); case "with": return new AST_With({ expression : parenthesised(), body : statement() }); default: unexpected(); } } }); function labeled_statement() { var label = as_symbol(true); expect(":"); S.labels.push(label); var start = S.token, stat = statement(); if (exigent_mode && !(stat instanceof AST_LabeledStatement)) unexpected(start); S.labels.pop(); stat.label = label; return stat; }; function simple_statement() { return new AST_Statement({ body: prog1(expression, semicolon) }); }; function break_cont(type) { var name = null, label = null; if (!can_insert_semicolon()) { name = is("name") ? S.token.value : null; } if (name != null) { next(); label = find_if(function(l){ return l.name == name }, S.labels); if (!label) croak("Label " + name + " without matching loop or statement"); label = new AST_Label({ name: name, symbol: label }); } else if (S.in_loop == 0) croak(type.TYPE + " not inside a loop or switch"); semicolon(); return new type({ label: label }); }; function for_() { expect("("); var init = null; if (!is("punc", ";")) { init = is("keyword", "var") ? (next(), var_(true)) : expression(true, true); if (is("operator", "in")) { if (init instanceof AST_Var && init.definitions.length > 1) croak("Only one variable declaration allowed in for..in loop"); next(); return for_in(init); } } return regular_for(init); }; function regular_for(init) { expect(";"); var test = is("punc", ";") ? null : expression(); expect(";"); var step = is("punc", ")") ? null : expression(); expect(")"); return new AST_For({ init : init, condition : test, step : step, body : in_loop(statement) }); }; function for_in(init) { var lhs = init instanceof AST_Var ? init.definitions[0].name : null; var obj = expression(); expect(")"); return new AST_ForIn({ init : init, name : lhs, object : obj, body : in_loop(statement) }); }; var function_ = function(in_statement) { var name = is("name") ? as_symbol(true) : null; if (in_statement && !name) unexpected(); expect("("); var ctor = in_statement ? AST_Defun : AST_Function; return new ctor({ name: name, argnames: (function(first, a){ while (!is("punc", ")")) { if (first) first = false; else expect(","); a.push(as_symbol(true)); } next(); return a; })(true, []), body: embed_tokens(function(){ ++S.in_function; var loop = S.in_loop; var labels = S.labels; S.in_directives = true; S.in_loop = 0; S.labels = []; var a = block_(); --S.in_function; S.in_loop = loop; S.labels = labels; return new AST_Bracketed({ body: a }); })() }); }; function if_() { var cond = parenthesised(), body = statement(), belse = null; if (is("keyword", "else")) { next(); belse = statement(); } return new AST_If({ condition : cond, consequent : body, alternative : belse }); }; function block_() { expect("{"); var a = []; while (!is("punc", "}")) { if (is("eof")) unexpected(); a.push(statement()); } next(); return a; }; var switch_block_ = embed_tokens(curry(in_loop, function(){ expect("{"); var a = [], cur = null, branch = null; while (!is("punc", "}")) { if (is("eof")) unexpected(); if (is("keyword", "case")) { if (branch) branch.end = prev(); cur = []; branch = new AST_Case({ start : prog1(S.token, next), expression : expression(), body : cur }); a.push(branch); expect(":"); } else if (is("keyword", "default")) { if (branch) branch.end = prev(); cur = []; branch = new AST_Default({ start : prog1(S.token, next, curry(expect, ":")), body : cur }) a.push(branch); } else { if (!cur) unexpected(); cur.push(statement()); } } if (branch) branch.end = prev(); next(); return new AST_SwitchBlock({ body: a }); })); function try_() { var body = new AST_Bracketed({ start : S.token, body : block_(), end : prev() }), bcatch = null, bfinally = null; if (is("keyword", "catch")) { var start = S.token; next(); expect("("); var name = as_symbol(true); expect(")"); bcatch = new AST_Catch({ start : start, argname : name, body : new AST_Bracketed({ start : S.token, body : block_(), end : prev() }), end : prev() }); } if (is("keyword", "finally")) { var start = S.token; next(); bfinally = new AST_Finally({ start : start, body : block_(), end : prev() }); } if (!bcatch && !bfinally) croak("Missing catch/finally blocks"); return new AST_Try({ btry : body, bcatch : bcatch, bfinally : bfinally }); }; function vardefs(no_in) { var a = []; for (;;) { a.push(new AST_VarDef({ start : S.token, name : as_symbol(true), value : is("operator", "=") ? (next(), expression(false, no_in)) : null, end : prev() })); if (!is("punc", ",")) break; next(); } return a; }; var var_ = function(no_in) { return new AST_Var({ start : prev(), definitions : vardefs(no_in), end : prev() }); }; var const_ = function() { return new AST_Const({ start : prev(), definitions : vardefs(), end : prev() }); }; var new_ = function() { var start = S.token; expect_token("operator", "new"); var newexp = expr_atom(false), args; if (is("punc", "(")) { next(); args = expr_list(")"); } else { args = []; } return subscripts(new AST_New({ start : start, expression : newexp, args : args, end : prev() }), true); }; function as_atom_node() { var tok = S.token, ret; switch (tok.type) { case "name": return as_symbol(); case "num": ret = new AST_Number({ start: tok, end: tok, value: tok.value }); break; case "string": ret = new AST_String({ start: tok, end: tok, value: tok.value }); break; case "regexp": ret = new AST_RegExp({ start: tok, end: tok, pattern: tok.value[0], mods: tok.value[1] }); break; case "atom": switch (tok.value) { case "false": ret = new AST_False({ start: tok, end: tok }); break; case "true": ret = new AST_True({ start: tok, end: tok }); break; case "null": ret = new AST_Null({ start: tok, end: tok }); break; } break; } next(); return ret; }; var expr_atom = function(allow_calls) { if (is("operator", "new")) { return new_(); } var start = S.token; if (is("punc")) { switch (start.value) { case "(": next(); var ex = expression(); ex.start = start; ex.end = S.token; expect(")"); return subscripts(ex, allow_calls); case "[": return subscripts(array_(), allow_calls); case "{": return subscripts(object_(), allow_calls); } unexpected(); } if (is("keyword", "function")) { next(); var func = function_(false); func.start = start; func.end = prev(); return subscripts(func, allow_calls); } if (HOP(ATOMIC_START_TOKEN, S.token.type)) { return subscripts(as_atom_node(), allow_calls); } unexpected(); }; function expr_list(closing, allow_trailing_comma, allow_empty) { var first = true, a = []; while (!is("punc", closing)) { if (first) first = false; else expect(","); if (allow_trailing_comma && is("punc", closing)) break; if (is("punc", ",") && allow_empty) { a.push(new AST_Undefined({ start: S.token, end: S.token })); } else { a.push(expression(false)); } } next(); return a; }; var array_ = embed_tokens(function() { expect("["); return new AST_Array({ elements: expr_list("]", !exigent_mode, true) }); }); var object_ = embed_tokens(function() { expect("{"); var first = true, a = []; while (!is("punc", "}")) { if (first) first = false; else expect(","); if (!exigent_mode && is("punc", "}")) // allow trailing comma break; var start = S.token; var type = start.type; var name = as_property_name(); if (type == "name" && !is("punc", ":")) { if (name.name == "get") { a.push(new AST_ObjectGetter({ start : start, name : name, func : function_(false), end : prev() })); continue; } if (name.name == "set") { a.push(new AST_ObjectSetter({ start : start, name : name, func : function_(false), end : prev() })); continue; } } expect(":"); a.push(new AST_ObjectKeyVal({ start : start, key : name, value : expression(false), end : prev() })); } next(); return new AST_Object({ properties: a }); }); function as_property_name() { switch (S.token.type) { case "num": case "string": case "name": case "operator": case "keyword": case "atom": return prog1(S.token.value, next); default: unexpected(); } }; function as_name() { switch (S.token.type) { case "name": case "operator": case "keyword": case "atom": return prog1(S.token.value, next); default: unexpected(); } }; function as_symbol(def) { if (!is("name")) croak("Name expected"); var name = S.token.value; var sym = new (name == "this" ? AST_This : def ? AST_Symbol : AST_SymbolRef)({ name : String(S.token.value), start : S.token, end : S.token }); next(); return sym; }; var subscripts = function(expr, allow_calls) { var start = expr.start; if (is("punc", ".")) { next(); return subscripts(new AST_Dot({ start : start, expression : expr, property : as_name(), end : prev() }), allow_calls); } if (is("punc", "[")) { next(); var prop = expression(); expect("]"); return subscripts(new AST_Sub({ start : start, expression : expr, property : prop, end : prev() }), allow_calls); } if (allow_calls && is("punc", "(")) { next(); return subscripts(new AST_Call({ start : start, expression : expr, args : expr_list(")"), end : prev() }), true); } return expr; }; var maybe_unary = function(allow_calls) { var start = S.token; if (is("operator") && HOP(UNARY_PREFIX, S.token.value)) { var ex = make_unary(AST_UnaryPrefix, prog1(S.token.value, next), maybe_unary(allow_calls)); ex.start = start; ex.end = prev(); return ex; } var val = expr_atom(allow_calls); while (is("operator") && HOP(UNARY_POSTFIX, S.token.value) && !S.token.nlb) { val = make_unary(AST_UnaryPostfix, S.token.value, val); val.start = start; val.end = S.token; next(); } return val; }; function make_unary(ctor, op, expr) { if ((op == "++" || op == "--") && !is_assignable(expr)) croak("Invalid use of " + op + " operator"); return new ctor({ operator: op, expression: expr }); }; var expr_op = function(left, min_prec, no_in) { var op = is("operator") ? S.token.value : null; if (op == "in" && no_in) op = null; var prec = op != null ? PRECEDENCE[op] : null; if (prec != null && prec > min_prec) { next(); var right = expr_op(maybe_unary(true), prec, no_in); return expr_op(new AST_Binary({ start : left.start, left : left, operator : op, right : right, end : right.end }), min_prec, no_in); } return left; }; function expr_ops(no_in) { return expr_op(maybe_unary(true), 0, no_in); }; var maybe_conditional = function(no_in) { var start = S.token; var expr = expr_ops(no_in); if (is("operator", "?")) { next(); var yes = expression(false); expect(":"); return new AST_Conditional({ start : start, condition : expr, consequent : yes, alternative : expression(false, no_in), end : peek() }); } return expr; }; function is_assignable(expr) { if (!exigent_mode) return true; switch (expr[0]+"") { case "dot": case "sub": case "new": case "call": return true; case "name": return expr[1] != "this"; } }; var maybe_assign = function(no_in) { var start = S.token; var left = maybe_conditional(no_in), val = S.token.value; if (is("operator") && HOP(ASSIGNMENT, val)) { if (is_assignable(left)) { next(); return new AST_Assign({ start : start, left : left, operator : ASSIGNMENT[val], right : maybe_assign(no_in), end : peek() }); } croak("Invalid assignment"); } return left; }; var expression = function(commas, no_in) { if (arguments.length == 0) commas = true; var start = S.token; var expr = maybe_assign(no_in); if (commas && is("punc", ",")) { next(); return new AST_Seq({ start : start, first : expr, second : expression(true, no_in), end : peek() }); } return expr; }; function in_loop(cont) { ++S.in_loop; var ret = cont(); --S.in_loop; return ret; }; return new AST_Toplevel({ start: S.token, body: (function(a){ while (!is("eof")) a.push(statement()); return a; })([]), end: prev() }); }; var warn = function() {};