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+/***********************************************************************
+
+ A JavaScript tokenizer / parser / beautifier / compressor.
+
+ This version is suitable for Node.js. With minimal changes (the
+ exports stuff) it should work on any JS platform.
+
+ This file contains the tokenizer/parser. It is a port to JavaScript
+ of parse-js [1], a JavaScript parser library written in Common Lisp
+ by Marijn Haverbeke. Thank you Marijn!
+
+ [1] http://marijn.haverbeke.nl/parse-js/
+
+ Exported functions:
+
+ - tokenizer(code) -- returns a function. Call the returned
+ function to fetch the next token.
+
+ - parse(code) -- returns an AST of the given JavaScript code.
+
+ -------------------------------- (C) ---------------------------------
+
+ Author: Mihai Bazon
+ <mihai.bazon@gmail.com>
+ http://mihai.bazon.net/blog
+
+ Distributed under the BSD license:
+
+ Copyright 2010 (c) Mihai Bazon <mihai.bazon@gmail.com>
+ Based on parse-js (http://marijn.haverbeke.nl/parse-js/).
+
+ 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.
+
+ ***********************************************************************/
+
+/* -----[ Tokenizer (constants) ]----- */
+
+var KEYWORDS = array_to_hash([
+ "break",
+ "case",
+ "catch",
+ "const",
+ "continue",
+ "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",
+ "debugger",
+ "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",
+ "undefined"
+]);
+
+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*)?$/i;
+
+var OPERATORS = array_to_hash([
+ "in",
+ "instanceof",
+ "typeof",
+ "new",
+ "void",
+ "delete",
+ "++",
+ "--",
+ "+",
+ "-",
+ "!",
+ "~",
+ "&",
+ "|",
+ "^",
+ "*",
+ "/",
+ "%",
+ ">>",
+ "<<",
+ ">>>",
+ "<",
+ ">",
+ "<=",
+ ">=",
+ "==",
+ "===",
+ "!=",
+ "!==",
+ "?",
+ "=",
+ "+=",
+ "-=",
+ "/=",
+ "*=",
+ "%=",
+ ">>=",
+ "<<=",
+ ">>>=",
+ "~=",
+ "%=",
+ "|=",
+ "^=",
+ "&=",
+ "&&",
+ "||"
+]);
+
+var WHITESPACE_CHARS = array_to_hash(characters(" \n\r\t"));
+
+var PUNC_BEFORE_EXPRESSION = array_to_hash(characters("[{}(,.;:"));
+
+var PUNC_CHARS = array_to_hash(characters("[]{}(),;:"));
+
+var REGEXP_MODIFIERS = array_to_hash(characters("gmsiy"));
+
+/* -----[ Tokenizer ]----- */
+
+function is_alphanumeric_char(ch) {
+ ch = ch.charCodeAt(0);
+ return (ch >= 48 && ch <= 57) ||
+ (ch >= 65 && ch <= 90) ||
+ (ch >= 97 && ch <= 122);
+};
+
+function is_identifier_char(ch) {
+ return is_alphanumeric_char(ch) || ch == "$" || ch == "_";
+};
+
+function is_digit(ch) {
+ ch = ch.charCodeAt(0);
+ return ch >= 48 && ch <= 57;
+};
+
+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;
+ this.col = col;
+ this.pos = pos;
+ try {
+ ({})();
+ } catch(ex) {
+ this.stack = ex.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) {
+ 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, skip_comments) {
+
+ 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
+ };
+
+ function peek() { return S.text.charAt(S.pos); };
+
+ function next(signal_eof) {
+ var ch = S.text.charAt(S.pos++);
+ if (signal_eof && !ch)
+ throw EX_EOF;
+ if (ch == "\n") {
+ S.newline_before = true;
+ ++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) {
+ 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,
+ nlb : S.newline_before
+ };
+ S.newline_before = false;
+ return 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)
+ 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() {
+ var ch = next(true);
+ switch (ch) {
+ case "n" : return "\n";
+ case "r" : return "\r";
+ case "t" : return "\t";
+ case "b" : return "\b";
+ case "v" : return "\v";
+ case "f" : return "\f";
+ case "0" : return "\0";
+ case "x" : return String.fromCharCode(hex_bytes(2));
+ case "u" : return String.fromCharCode(hex_bytes(4));
+ 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 == "\\") ch = read_escaped_char();
+ 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);
+ };
+
+ function read_multiline_comment() {
+ next();
+ return with_eof_error("Unterminated multiline comment", function(){
+ var i = find("*/", true),
+ text = S.text.substring(S.pos, i),
+ tok = token("comment2", text);
+ S.pos = i + 2;
+ S.line += text.split("\n").length - 1;
+ S.newline_before = text.indexOf("\n") >= 0;
+ return tok;
+ });
+ };
+
+ function read_regexp() {
+ return with_eof_error("Unterminated regular expression", function(){
+ var prev_backslash = false, regexp = "", 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_while(function(ch){
+ return HOP(REGEXP_MODIFIERS, ch);
+ });
+ return token("regexp", [ regexp, mods ]);
+ });
+ };
+
+ function read_operator(prefix) {
+ function grow(op) {
+ var bigger = op + peek();
+ if (HOP(OPERATORS, bigger)) {
+ next();
+ return grow(bigger);
+ } else {
+ return op;
+ }
+ };
+ return token("operator", grow(prefix || next()));
+ };
+
+ var handle_slash = skip_comments ? function() {
+ next();
+ var regex_allowed = S.regex_allowed;
+ switch (peek()) {
+ case "/": read_line_comment(); S.regex_allowed = regex_allowed; return next_token();
+ case "*": read_multiline_comment(); S.regex_allowed = regex_allowed; return next_token();
+ }
+ return S.regex_allowed ? read_regexp() : read_operator("/");
+ } : function() {
+ next();
+ switch (peek()) {
+ case "/": return read_line_comment();
+ case "*": return read_multiline_comment();
+ }
+ 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_while(is_identifier_char);
+ return !HOP(KEYWORDS, word)
+ ? token("name", word)
+ : HOP(OPERATORS, word)
+ ? token("operator", word)
+ : HOP(KEYWORDS_ATOM, word)
+ ? token("atom", 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)
+ return read_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 (is_identifier_char(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].substr(0, a[i].length - 1);
+ i++;
+ }
+ return ret;
+})(
+ ["+=", "-=", "/=", "*=", "%=", ">>=", "<<=", ">>>=", "~=", "%=", "|=", "^=", "&="],
+ { "=": true },
+ 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 NodeWithToken(str, start, end) {
+ this.name = str;
+ this.start = start;
+ this.end = end;
+};
+
+NodeWithToken.prototype.toString = function() { return this.name; };
+
+function parse($TEXT, strict_mode, embed_tokens) {
+
+ var S = {
+ input: tokenizer($TEXT, true),
+ token: null,
+ prev: null,
+ peeked: null,
+ in_function: 0,
+ 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();
+ }
+ 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 + ", expected " + type);
+ };
+
+ function expect(punc) { return expect_token("punc", punc); };
+
+ function can_insert_semicolon() {
+ return !strict_mode && (
+ S.token.nlb || is("eof") || is("punc", "}")
+ );
+ };
+
+ function semicolon() {
+ if (is("punc", ";")) next();
+ else if (!can_insert_semicolon()) unexpected();
+ };
+
+ function as() {
+ return slice(arguments);
+ };
+
+ function parenthesised() {
+ expect("(");
+ var ex = expression();
+ expect(")");
+ return ex;
+ };
+
+ function add_tokens(str, start, end) {
+ return new NodeWithToken(str, start, end);
+ };
+
+ var statement = embed_tokens ? function() {
+ var start = S.token;
+ var stmt = $statement();
+ stmt[0] = add_tokens(stmt[0], start, prev());
+ return stmt;
+ } : $statement;
+
+ function $statement() {
+ if (is("operator", "/")) {
+ S.peeked = null;
+ S.token = S.input(true); // force regexp
+ }
+ switch (S.token.type) {
+ case "num":
+ case "string":
+ case "regexp":
+ case "operator":
+ case "atom":
+ return simple_statement();
+
+ case "name":
+ return is_token(peek(), "punc", ":")
+ ? labeled_statement(prog1(S.token.value, next, next))
+ : simple_statement();
+
+ case "punc":
+ switch (S.token.value) {
+ case "{":
+ return as("block", block_());
+ case "[":
+ case "(":
+ return simple_statement();
+ case ";":
+ next();
+ return as("block");
+ default:
+ unexpected();
+ }
+
+ case "keyword":
+ switch (prog1(S.token.value, next)) {
+ case "break":
+ return break_cont("break");
+
+ case "continue":
+ return break_cont("continue");
+
+ case "debugger":
+ semicolon();
+ return as("debugger");
+
+ case "do":
+ return (function(body){
+ expect_token("keyword", "while");
+ return as("do", prog1(parenthesised, semicolon), 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 as("return",
+ is("punc", ";")
+ ? (next(), null)
+ : can_insert_semicolon()
+ ? null
+ : prog1(expression, semicolon));
+
+ case "switch":
+ return as("switch", parenthesised(), switch_block_());
+
+ case "throw":
+ return as("throw", prog1(expression, semicolon));
+
+ case "try":
+ return try_();
+
+ case "var":
+ return prog1(var_, semicolon);
+
+ case "const":
+ return prog1(const_, semicolon);
+
+ case "while":
+ return as("while", parenthesised(), in_loop(statement));
+
+ case "with":
+ return as("with", parenthesised(), statement());
+
+ default:
+ unexpected();
+ }
+ }
+ };
+
+ function labeled_statement(label) {
+ S.labels.push(label);
+ var start = S.token, stat = statement();
+ if (strict_mode && !HOP(STATEMENTS_WITH_LABELS, stat[0]))
+ unexpected(start);
+ S.labels.pop();
+ return as("label", label, stat);
+ };
+
+ function simple_statement() {
+ return as("stat", prog1(expression, semicolon));
+ };
+
+ function break_cont(type) {
+ var name = is("name") ? S.token.value : null;
+ if (name != null) {
+ next();
+ if (!member(name, S.labels))
+ croak("Label " + name + " without matching loop or statement");
+ }
+ else if (S.in_loop == 0)
+ croak(type + " not inside a loop or switch");
+ semicolon();
+ return as(type, name);
+ };
+
+ function for_() {
+ expect("(");
+ var has_var = is("keyword", "var");
+ if (has_var)
+ next();
+ if (is("name") && is_token(peek(), "operator", "in")) {
+ // for (i in foo)
+ var name = S.token.value;
+ next(); next();
+ var obj = expression();
+ expect(")");
+ return as("for-in", has_var, name, obj, in_loop(statement));
+ } else {
+ // classic for
+ var init = is("punc", ";") ? null : has_var ? var_() : expression();
+ expect(";");
+ var test = is("punc", ";") ? null : expression();
+ expect(";");
+ var step = is("punc", ")") ? null : expression();
+ expect(")");
+ return as("for", init, test, step, in_loop(statement));
+ }
+ };
+
+ function function_(in_statement) {
+ var name = is("name") ? prog1(S.token.value, next) : null;
+ if (in_statement && !name)
+ unexpected();
+ expect("(");
+ return as(in_statement ? "defun" : "function",
+ name,
+ // arguments
+ (function(first, a){
+ while (!is("punc", ")")) {
+ if (first) first = false; else expect(",");
+ if (!is("name")) unexpected();
+ a.push(S.token.value);
+ next();
+ }
+ next();
+ return a;
+ })(true, []),
+ // body
+ (function(){
+ ++S.in_function;
+ var loop = S.in_loop;
+ S.in_loop = 0;
+ var a = block_();
+ --S.in_function;
+ S.in_loop = loop;
+ return a;
+ })());
+ };
+
+ function if_() {
+ var cond = parenthesised(), body = statement(), belse;
+ if (is("keyword", "else")) {
+ next();
+ belse = statement();
+ }
+ return as("if", cond, body, belse);
+ };
+
+ function block_() {
+ expect("{");
+ var a = [];
+ while (!is("punc", "}")) {
+ if (is("eof")) unexpected();
+ a.push(statement());
+ }
+ next();
+ return a;
+ };
+
+ var switch_block_ = curry(in_loop, function(){
+ expect("{");
+ var a = [], cur = null;
+ while (!is("punc", "}")) {
+ if (is("eof")) unexpected();
+ if (is("keyword", "case")) {
+ next();
+ cur = [];
+ a.push([ expression(), cur ]);
+ expect(":");
+ }
+ else if (is("keyword", "default")) {
+ next();
+ expect(":");
+ cur = [];
+ a.push([ null, cur ]);
+ }
+ else {
+ if (!cur) unexpected();
+ cur.push(statement());
+ }
+ }
+ next();
+ return a;
+ });
+
+ function try_() {
+ var body = block_(), bcatch, bfinally;
+ if (is("keyword", "catch")) {
+ next();
+ expect("(");
+ if (!is("name"))
+ croak("Name expected");
+ var name = S.token.value;
+ next();
+ expect(")");
+ bcatch = [ name, block_() ];
+ }
+ if (is("keyword", "finally")) {
+ next();
+ bfinally = block_();
+ }
+ if (!bcatch && !bfinally)
+ croak("Missing catch/finally blocks");
+ return as("try", body, bcatch, bfinally);
+ };
+
+ function vardefs() {
+ var a = [];
+ for (;;) {
+ if (!is("name"))
+ unexpected();
+ var name = S.token.value;
+ next();
+ if (is("operator", "=")) {
+ next();
+ a.push([ name, expression(false) ]);
+ } else {
+ a.push([ name ]);
+ }
+ if (!is("punc", ","))
+ break;
+ next();
+ }
+ return a;
+ };
+
+ function var_() {
+ return as("var", vardefs());
+ };
+
+ function const_() {
+ return as("const", vardefs());
+ };
+
+ function new_() {
+ var newexp = expr_atom(false), args;
+ if (is("punc", "(")) {
+ next();
+ args = expr_list(")");
+ } else {
+ args = [];
+ }
+ return subscripts(as("new", newexp, args), true);
+ };
+
+ function expr_atom(allow_calls) {
+ if (is("operator", "new")) {
+ next();
+ return new_();
+ }
+ if (is("operator") && HOP(UNARY_PREFIX, S.token.value)) {
+ return make_unary("unary-prefix",
+ prog1(S.token.value, next),
+ expr_atom(allow_calls));
+ }
+ if (is("punc")) {
+ switch (S.token.value) {
+ case "(":
+ next();
+ return subscripts(prog1(expression, curry(expect, ")")), allow_calls);
+ case "[":
+ next();
+ return subscripts(array_(), allow_calls);
+ case "{":
+ next();
+ return subscripts(object_(), allow_calls);
+ }
+ unexpected();
+ }
+ if (is("keyword", "function")) {
+ next();
+ return subscripts(function_(false), allow_calls);
+ }
+ if (HOP(ATOMIC_START_TOKEN, S.token.type)) {
+ var atom = S.token.type == "regexp"
+ ? as("regexp", S.token.value[0], S.token.value[1])
+ : as(S.token.type, S.token.value);
+ return subscripts(prog1(atom, next), allow_calls);
+ }
+ unexpected();
+ };
+
+ function expr_list(closing, allow_trailing_comma) {
+ var first = true, a = [];
+ while (!is("punc", closing)) {
+ if (first) first = false; else expect(",");
+ if (allow_trailing_comma && is("punc", closing))
+ break;
+ a.push(expression(false));
+ }
+ next();
+ return a;
+ };
+
+ function array_() {
+ return as("array", expr_list("]", !strict_mode));
+ };
+
+ function object_() {
+ var first = true, a = [];
+ while (!is("punc", "}")) {
+ if (first) first = false; else expect(",");
+ if (!strict_mode && is("punc", "}"))
+ // allow trailing comma
+ break;
+ var type = S.token.type;
+ var name = as_property_name();
+ if (type == "name" && (name == "get" || name == "set") && !is("punc", ":")) {
+ a.push([ as_name(), function_(false), name ]);
+ } else {
+ expect(":");
+ a.push([ name, expression(false) ]);
+ }
+ }
+ next();
+ return as("object", a);
+ };
+
+ function as_property_name() {
+ switch (S.token.type) {
+ case "num":
+ case "string":
+ return prog1(S.token.value, next);
+ }
+ return as_name();
+ };
+
+ function as_name() {
+ switch (S.token.type) {
+ case "name":
+ case "operator":
+ case "keyword":
+ case "atom":
+ return prog1(S.token.value, next);
+ default:
+ unexpected();
+ }
+ };
+
+ function subscripts(expr, allow_calls) {
+ if (is("punc", ".")) {
+ next();
+ return subscripts(as("dot", expr, as_name()), allow_calls);
+ }
+ if (is("punc", "[")) {
+ next();
+ return subscripts(as("sub", expr, prog1(expression, curry(expect, "]"))), allow_calls);
+ }
+ if (allow_calls && is("punc", "(")) {
+ next();
+ return subscripts(as("call", expr, expr_list(")")), true);
+ }
+ if (allow_calls && is("operator") && HOP(UNARY_POSTFIX, S.token.value)) {
+ return prog1(curry(make_unary, "unary-postfix", S.token.value, expr),
+ next);
+ }
+ return expr;
+ };
+
+ function make_unary(tag, op, expr) {
+ if ((op == "++" || op == "--") && !is_assignable(expr))
+ croak("Invalid use of " + op + " operator");
+ return as(tag, op, expr);
+ };
+
+ function expr_op(left, min_prec) {
+ var op = is("operator") ? S.token.value : null;
+ var prec = op != null ? PRECEDENCE[op] : null;
+ if (prec != null && prec > min_prec) {
+ next();
+ var right = expr_op(expr_atom(true), prec);
+ return expr_op(as("binary", op, left, right), min_prec);
+ }
+ return left;
+ };
+
+ function expr_ops() {
+ return expr_op(expr_atom(true), 0);
+ };
+
+ function maybe_conditional() {
+ var expr = expr_ops();
+ if (is("operator", "?")) {
+ next();
+ var yes = expression(false);
+ expect(":");
+ return as("conditional", expr, yes, expression(false));
+ }
+ return expr;
+ };
+
+ function is_assignable(expr) {
+ switch (expr[0]) {
+ case "dot":
+ case "sub":
+ return true;
+ case "name":
+ return expr[1] != "this";
+ }
+ };
+
+ function maybe_assign() {
+ var left = maybe_conditional(), val = S.token.value;
+ if (is("operator") && HOP(ASSIGNMENT, val)) {
+ if (is_assignable(left)) {
+ next();
+ return as("assign", ASSIGNMENT[val], left, maybe_assign());
+ }
+ croak("Invalid assignment");
+ }
+ return left;
+ };
+
+ function expression(commas) {
+ if (arguments.length == 0)
+ commas = true;
+ var expr = maybe_assign();
+ if (commas && is("punc", ",")) {
+ next();
+ return as("seq", expr, expression());
+ }
+ return expr;
+ };
+
+ function in_loop(cont) {
+ try {
+ ++S.in_loop;
+ return cont();
+ } finally {
+ --S.in_loop;
+ }
+ };
+
+ return as("toplevel", (function(a){
+ while (!is("eof"))
+ a.push(statement());
+ return a;
+ })([]));
+
+};
+
+/* -----[ Utilities ]----- */
+
+function curry(f) {
+ var args = slice(arguments, 1);
+ return function() { return f.apply(this, args.concat(slice(arguments))); };
+};
+
+function prog1(ret) {
+ if (ret instanceof Function)
+ ret = ret();
+ for (var i = 1, n = arguments.length; --n > 0; ++i)
+ arguments[i]();
+ return ret;
+};
+
+function array_to_hash(a) {
+ var ret = {};
+ for (var i = 0; i < a.length; ++i)
+ ret[a[i]] = true;
+ return ret;
+};
+
+function slice(a, start) {
+ return Array.prototype.slice.call(a, start == null ? 0 : start);
+};
+
+function characters(str) {
+ return str.split("");
+};
+
+function member(name, array) {
+ for (var i = array.length; --i >= 0;)
+ if (array[i] === name)
+ return true;
+ return false;
+};
+
+function HOP(obj, prop) {
+ return Object.prototype.hasOwnProperty.call(obj, prop);
+};
+
+/* -----[ Exports ]----- */
+
+exports.tokenizer = tokenizer;
+exports.parse = parse;
+exports.slice = slice;
+exports.curry = curry;
+exports.member = member;
+exports.array_to_hash = array_to_hash;
+exports.PRECEDENCE = PRECEDENCE;
+exports.KEYWORDS_ATOM = KEYWORDS_ATOM;
+exports.RESERVED_WORDS = RESERVED_WORDS;
+exports.KEYWORDS = KEYWORDS;
+exports.ATOMIC_START_TOKEN = ATOMIC_START_TOKEN;
+exports.OPERATORS = OPERATORS;
+exports.is_alphanumeric_char = is_alphanumeric_char;
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-14 17:20:16 +0000