added syntax checking for test files using esprima.js

@@ -279,9 +279,16 @@
                 throw "Can only exec() files with .js or .coffee extensions";
             }
             if (fileExt(file) === "coffee") {
-                phantom.injectJs(file);
+                phantom.injectJs(file); // FIXME: syntax validation?
             } else {
-                eval(fs.read(file));
+                var testContents = fs.read(file);
+                var parsed;
+                try {
+                    parsed = esprima.parse(testContents);
+                } catch(e) {
+                    throw "Unable to parse test file " + file + ": " + e.toString();
+                }
+                eval(testContents);
             }
         };
 

+/*
+  Copyright (C) 2011 Ariya Hidayat <ariya.hidayat@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 HOLDERS AND CONTRIBUTORS "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 <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.
+*/
+
+/*global esprima:true, exports:true,
+parseAssignmentExpression: true, parseBlock: true, parseExpression: true,
+parseFunctionDeclaration: true, parseFunctionExpression: true,
+parseStatement: true */
+
+(function (exports) {
+    'use strict';
+
+    var Token,
+        Syntax,
+        source,
+        index,
+        lineNumber,
+        length,
+        buffer,
+        comments;
+
+    Token = {
+        BooleanLiteral: 1,
+        EOF: 2,
+        Identifier: 3,
+        Keyword: 4,
+        NullLiteral: 5,
+        NumericLiteral: 6,
+        Punctuator: 7,
+        StringLiteral: 8
+    };
+
+    Syntax = {
+        AssignmentExpression: 'AssignmentExpression',
+        ArrayExpression: 'ArrayExpression',
+        BlockStatement: 'BlockStatement',
+        BinaryExpression: 'BinaryExpression',
+        BreakStatement: 'BreakStatement',
+        CallExpression: 'CallExpression',
+        CatchClause: 'CatchClause',
+        Comment: 'Comment',
+        ConditionalExpression: 'ConditionalExpression',
+        ContinueStatement: 'ContinueStatement',
+        DoWhileStatement: 'DoWhileStatement',
+        DebuggerStatement: 'DebuggerStatement',
+        EmptyStatement: 'EmptyStatement',
+        ExpressionStatement: 'ExpressionStatement',
+        ForStatement: 'ForStatement',
+        ForInStatement: 'ForInStatement',
+        FunctionDeclaration: 'FunctionDeclaration',
+        FunctionExpression: 'FunctionExpression',
+        Identifier: 'Identifier',
+        IfStatement: 'IfStatement',
+        Literal: 'Literal',
+        LabeledStatement: 'LabeledStatement',
+        LogicalExpression: 'LogicalExpression',
+        MemberExpression: 'MemberExpression',
+        NewExpression: 'NewExpression',
+        ObjectExpression: 'ObjectExpression',
+        Program: 'Program',
+        ReturnStatement: 'ReturnStatement',
+        SequenceExpression: 'SequenceExpression',
+        SwitchStatement: 'SwitchStatement',
+        SwitchCase: 'SwitchCase',
+        ThisExpression: 'ThisExpression',
+        ThrowStatement: 'ThrowStatement',
+        TryStatement: 'TryStatement',
+        UnaryExpression: 'UnaryExpression',
+        UpdateExpression: 'UpdateExpression',
+        VariableDeclaration: 'VariableDeclaration',
+        WhileStatement: 'WhileStatement',
+        WithStatement: 'WithStatement'
+    };
+
+    if (typeof Object.freeze === 'function') {
+        Object.freeze(Token);
+        Object.freeze(Syntax);
+    }
+
+    function isDecimalDigit(ch) {
+        return '0123456789'.indexOf(ch) >= 0;
+    }
+
+    function isHexDigit(ch) {
+        return '0123456789abcdefABCDEF'.indexOf(ch) >= 0;
+    }
+
+    // TODO: really handle Unicode category Lu, LI, Lt, Lm, Lo, NI
+    function isUnicodeLetter(ch) {
+        return (ch >= 'a' && ch <= 'z') ||
+            (ch >= 'A' && ch <= 'Z');
+    }
+
+    // TODO: really handle Unicode category Nd
+    function isUnicodeDigit(ch) {
+        return (ch >= '0') && (ch <= '9');
+    }
+
+    // 7.2 White Space
+
+    function isWhiteSpace(ch) {
+        // TODO Unicode "space separator"
+        return (ch === ' ') || (ch === '\u0009') || (ch === '\u000B') ||
+            (ch === '\u000C') || (ch === '\u00A0') || (ch === '\uFEFF');
+    }
+
+    // 7.3 Line Terminators
+
+    function isLineTerminator(ch) {
+        return (ch === '\n' || ch === '\r' || ch === '\u2028' || ch === '\u2029');
+    }
+
+    // 7.6 Identifier Names and Identifiers
+
+    function isIdentifierStart(ch) {
+        // TODO UnicodeEscapeSequence
+        return (ch === '$') || (ch === '_') || isUnicodeLetter(ch);
+    }
+
+    function isIdentifierPart(ch) {
+        // TODO UnicodeCombiningMark UnicodeConnectorPunctuation and ZWNJ and ZWJ
+        return isIdentifierStart(ch) || isUnicodeDigit(ch);
+    }
+
+    // 7.6.1.1 Keywords
+    // 7.6.1.2 Future Reserved Words
+
+    function isKeyword(id) {
+        switch (id) {
+
+        // Keywords.
+        case 'break':
+        case 'case':
+        case 'catch':
+        case 'continue':
+        case 'debugger':
+        case 'default':
+        case 'delete':
+        case 'do':
+        case 'else':
+        case 'finally':
+        case 'for':
+        case 'function':
+        case 'if':
+        case 'in':
+        case 'instanceof':
+        case 'new':
+        case 'return':
+        case 'switch':
+        case 'this':
+        case 'throw':
+        case 'try':
+        case 'typeof':
+        case 'var':
+        case 'void':
+        case 'while':
+        case 'with':
+
+        // Future reserved words.
+        case 'class':
+        case 'const':
+        case 'enum':
+        case 'export':
+        case 'extends':
+        case 'import':
+        case 'super':
+
+        // strict mode
+        case 'implements':
+        case 'interface':
+        case 'let':
+        case 'package':
+        case 'private':
+        case 'protected':
+        case 'public':
+        case 'static':
+        case 'yield':
+            return true;
+        }
+
+        return false;
+    }
+
+    // Return the next character and move forward.
+
+    function nextChar() {
+        var ch = '\x00',
+            idx = index;
+        if (idx < length) {
+            ch = source[idx];
+            index += 1;
+        }
+        return ch;
+    }
+
+    // 7.4 Comments
+
+    function skipComment() {
+        var ch, blockComment, lineComment;
+
+        blockComment = false;
+        lineComment = false;
+
+        while (index < length) {
+            ch = source[index];
+
+            if (lineComment) {
+                nextChar();
+                if (isLineTerminator(ch)) {
+                    lineComment = false;
+                    lineNumber += 1;
+                }
+            } else if (blockComment) {
+                nextChar();
+                if (ch === '*') {
+                    ch = source[index];
+                    if (ch === '/') {
+                        nextChar();
+                        blockComment = false;
+                    }
+                } else if (isLineTerminator(ch)) {
+                    lineNumber += 1;
+                }
+            } else if (ch === '/') {
+                ch = source[index + 1];
+                if (ch === '/') {
+                    nextChar();
+                    nextChar();
+                    lineComment = true;
+                } else if (ch === '*') {
+                    nextChar();
+                    nextChar();
+                    blockComment = true;
+                } else {
+                    break;
+                }
+            } else if (isWhiteSpace(ch)) {
+                nextChar();
+            } else if (isLineTerminator(ch)) {
+                nextChar();
+                lineNumber += 1;
+            } else {
+                break;
+            }
+        }
+    }
+
+    function scanIdentifier() {
+        var ch, id;
+
+        ch = source[index];
+        if (!isIdentifierStart(ch)) {
+            return;
+        }
+
+        id = nextChar();
+        while (index < length) {
+            ch = source[index];
+            if (!isIdentifierPart(ch)) {
+                break;
+            }
+            id += nextChar();
+        }
+
+        // There is no keyword or literal with only one character.
+        // Thus, it must be an identifier.
+        if (id.length === 1) {
+            return {
+                type: Token.Identifier,
+                value: id
+            };
+        }
+
+        if (isKeyword(id)) {
+            return {
+                type: Token.Keyword,
+                value: id
+            };
+        }
+
+        // 7.8.1 Null Literals
+
+        if (id === 'null') {
+            return {
+                type: Token.NullLiteral
+            };
+        }
+
+        // 7.8.2 Boolean Literals
+
+        if (id === 'true' || id === 'false') {
+            return {
+                type: Token.BooleanLiteral,
+                value: id
+            };
+        }
+
+        return {
+            type: Token.Identifier,
+            value: id
+        };
+    }
+
+    // 7.7 Punctuators
+
+    function scanPunctuator() {
+        var ch1 = source[index],
+            ch2,
+            ch3,
+            ch4;
+
+        // Check for most common single-character punctuators.
+
+        if (ch1 === ';' || ch1 === '{' || ch1 === '}') {
+            nextChar();
+            return {
+                type: Token.Punctuator,
+                value: ch1
+            };
+        }
+
+        if (ch1 === ',' || ch1 === '(' || ch1 === ')') {
+            nextChar();
+            return {
+                type: Token.Punctuator,
+                value: ch1
+            };
+        }
+
+        // Dot (.) can also start a floating-point number, hence the need
+        // to check the next character.
+
+        ch2 = source[index + 1];
+        if (ch1 === '.' && !isDecimalDigit(ch2)) {
+            return {
+                type: Token.Punctuator,
+                value: nextChar()
+            };
+        }
+
+        // Peek more characters.
+
+        ch3 = source[index + 2];
+        ch4 = source[index + 3];
+
+        // 4-character punctuator: >>>=
+
+        if (ch1 === '>' && ch2 === '>' && ch3 === '>') {
+            if (ch4 === '=') {
+                nextChar();
+                nextChar();
+                nextChar();
+                nextChar();
+                return {
+                    type: Token.Punctuator,
+                    value: '>>>='
+                };
+            }
+        }
+
+        // 3-character punctuators: === !== >>> <<= >>=
+
+        if (ch1 === '=' && ch2 === '=' && ch3 === '=') {
+            nextChar();
+            nextChar();
+            nextChar();
+            return {
+                type: Token.Punctuator,
+                value: '==='
+            };
+        }
+
+        if (ch1 === '!' && ch2 === '=' && ch3 === '=') {
+            nextChar();
+            nextChar();
+            nextChar();
+            return {
+                type: Token.Punctuator,
+                value: '!=='
+            };
+        }
+
+        if (ch1 === '>' && ch2 === '>' && ch3 === '>') {
+            nextChar();
+            nextChar();
+            nextChar();
+            return {
+                type: Token.Punctuator,
+                value: '>>>'
+            };
+        }
+
+        if (ch1 === '<' && ch2 === '<' && ch3 === '=') {
+            nextChar();
+            nextChar();
+            nextChar();
+            return {
+                type: Token.Punctuator,
+                value: '<<='
+            };
+        }
+
+        if (ch1 === '>' && ch2 === '>' && ch3 === '=') {
+            nextChar();
+            nextChar();
+            nextChar();
+            return {
+                type: Token.Punctuator,
+                value: '>>='
+            };
+        }
+
+        // 2-character punctuators: <= >= == != ++ -- << >> && ||
+        // += -= *= %= &= |= ^= /=
+
+        if (ch2 === '=') {
+            if ('<>=!+-*%&|^/'.indexOf(ch1) >= 0) {
+                nextChar();
+                nextChar();
+                return {
+                    type: Token.Punctuator,
+                    value: ch1 + ch2
+                };
+            }
+        }
+
+        if (ch1 === ch2 && ('+-<>&|'.indexOf(ch1) >= 0)) {
+            if ('+-<>&|'.indexOf(ch2) >= 0) {
+                nextChar();
+                nextChar();
+                return {
+                    type: Token.Punctuator,
+                    value: ch1 + ch2
+                };
+            }
+        }
+
+        // The remaining 1-character punctuators.
+
+        if ('[]<>+-*%&|^!~?:=/'.indexOf(ch1) >= 0) {
+            return {
+                type: Token.Punctuator,
+                value: nextChar()
+            };
+        }
+    }
+
+    // 7.8.3 Numeric Literals
+
+    function scanNumericLiteral() {
+        var number, ch;
+
+        ch = source[index];
+        if (!isDecimalDigit(ch) && (ch !== '.')) {
+            return;
+        }
+
+        number = '';
+        if (ch !== '.') {
+            number = nextChar();
+            ch = source[index];
+
+            // Hex number starts with '0x'.
+            if (ch === 'x' || ch === 'X') {
+                number += nextChar();
+                while (index < length) {
+                    ch = source[index];
+                    if (!isHexDigit(ch)) {
+                        break;
+                    }
+                    number += nextChar();
+                }
+                return {
+                    type: Token.NumericLiteral,
+                    value: parseInt(number, 16)
+                };
+            }
+
+            while (index < length) {
+                ch = source[index];
+                if (!isDecimalDigit(ch)) {
+                    break;
+                }
+                number += nextChar();
+            }
+        }
+
+        if (ch === '.') {
+            number += nextChar();
+            while (index < length) {
+                ch = source[index];
+                if (!isDecimalDigit(ch)) {
+                    break;
+                }
+                number += nextChar();
+            }
+        }
+
+        if (ch === 'e' || ch === 'E') {
+            number += nextChar();
+            ch = source[index];
+            if (ch === '+' || ch === '-' || isDecimalDigit(ch)) {
+                number += nextChar();
+                while (index < length) {
+                    ch = source[index];
+                    if (!isDecimalDigit(ch)) {
+                        break;
+                    }
+                    number += nextChar();
+                }
+            } else {
+                ch = 'character ' + ch;
+                if (index >= length) {
+                    ch = '<end>';
+                }
+                throw new Error('Line ' + lineNumber + ': Unexpected ' + ch +
+                    ' after the exponent sign');
+            }
+        }
+
+        return {
+            type: Token.NumericLiteral,
+            value: parseFloat(number)
+        };
+    }
+
+    // 7.8.4 String Literals
+
+    // TODO Unicode
+    function scanStringLiteral() {
+        var str = '', quote, ch;
+
+        quote = source[index];
+        if (quote !== '\'' && quote !== '"') {
+            return;
+        }
+        nextChar();
+
+        while (index < length) {
+            ch = nextChar();
+
+            if (ch === quote) {
+                quote = '';
+                break;
+            } else if (ch === '\\') {
+                ch = nextChar();
+                if (!isLineTerminator(ch)) {
+                    str += '\\';
+                    str += ch;
+                }
+            } else {
+                str += ch;
+            }
+        }
+
+        if (quote !== '') {
+            throw new Error('Line ' + lineNumber + ': Unterminated string constant');
+        }
+
+        return {
+            type: Token.StringLiteral,
+            value: str
+        };
+    }
+
+    function scanRegExp() {
+        var str = '', ch, classMarker = false;
+
+        buffer = null;
+        skipComment();
+
+        ch = source[index];
+        if (ch !== '/') {
+            return;
+        }
+        str = nextChar();
+
+        while (index < length) {
+            ch = nextChar();
+            str += ch;
+            if (classMarker) {
+                if (ch === ']') {
+                    classMarker = false;
+                }
+            } else {
+                if (ch === '\\') {
+                    str += nextChar();
+                }
+                if (ch === '/') {
+                    break;
+                }
+                if (ch === '[') {
+                    classMarker = true;
+                }
+                if (isLineTerminator(ch)) {
+                    throw new Error('Line ' + lineNumber +
+                        ': Unexpected line terminator in a regular expression');
+                }
+            }
+        }
+
+        while (index < length) {
+            ch = source[index];
+            if (!isIdentifierPart(ch)) {
+                break;
+            }
+            str += nextChar();
+        }
+
+        return str;
+    }
+
+    function advance() {
+        var ch, token;
+
+        if (index >= length) {
+            return {
+                type: Token.EOF
+            };
+        }
+
+        token = scanPunctuator();
+        if (typeof token !== 'undefined') {
+            return token;
+        }
+
+        ch = source[index];
+
+        if (ch === '\'' || ch === '"') {
+            return scanStringLiteral();
+        }
+
+        if (ch === '.' || isDecimalDigit(ch)) {
+            return scanNumericLiteral();
+        }
+
+        token = scanIdentifier();
+        if (typeof token !== 'undefined') {
+            return token;
+        }
+
+        throw new Error('Line ' + lineNumber +
+            ': Unknown token from character ' + nextChar());
+    }
+
+    function lex() {
+        var pos, token;
+
+        if (buffer) {
+            index = buffer.range[1];
+            lineNumber = buffer.lineNumber;
+            token = buffer;
+            buffer = null;
+            return token;
+        }
+
+        buffer = null;
+        skipComment();
+
+        pos = index;
+        token = advance();
+        token.range = [pos, index];
+        token.lineNumber = lineNumber;
+
+        return token;
+    }
+
+    function lookahead() {
+        var pos, line, token;
+
+        if (buffer !== null) {
+            return buffer;
+        }
+
+        pos = index;
+        line = lineNumber;
+        token = lex();
+        index = pos;
+        lineNumber = line;
+
+        buffer = token;
+        return buffer;
+    }
+
+    // Return true if there is a line terminator before the next token.
+
+    function peekLineTerminator() {
+        var pos, line, found;
+
+        pos = index;
+        line = lineNumber;
+        skipComment();
+        found = lineNumber !== line;
+        index = pos;
+        lineNumber = line;
+
+        return found;
+    }
+
+    // Throw an exception because of the token.
+
+    function throwUnexpected(token) {
+        var s;
+
+        if (token.type === Token.EOF) {
+            throw new Error('Line ' + lineNumber + ': Unexpected <EOF>');
+        }
+
+        s = token.value;
+        if (s.length > 10) {
+            s = s.substr(0, 10) + '...';
+        }
+        throw new Error('Line ' + lineNumber + ': Unexpected token ' + s);
+    }
+
+    // Expect the next token to match the specified punctuator.
+    // If not, an exception will be thrown.
+
+    function expect(value) {
+        var token = lex();
+        if (token.type !== Token.Punctuator || token.value !== value) {
+            throwUnexpected(token);
+        }
+    }
+
+    // Expect the next token to match the specified keyword.
+    // If not, an exception will be thrown.
+
+    function expectKeyword(keyword) {
+        var token = lex();
+        if (token.type !== Token.Keyword || token.value !== keyword) {
+            throwUnexpected(token);
+        }
+    }
+
+    // Return true if the next token matches the specified punctuator.
+
+    function match(value) {
+        var token = lookahead();
+        return token.type === Token.Punctuator && token.value === value;
+    }
+
+    // Return true if the next token matches the specified keyword
+
+    function matchKeyword(keyword) {
+        var token = lookahead();
+        return token.type === Token.Keyword && token.value === keyword;
+    }
+
+    // Return true if the next token is an assignment operator
+
+    function matchAssign() {
+        var token = lookahead(),
+            op = token.value;
+
+        if (token.type !== Token.Punctuator) {
+            return false;
+        }
+        return op === '=' ||
+            op === '*=' ||
+            op === '/=' ||
+            op === '%=' ||
+            op === '+=' ||
+            op === '-=' ||
+            op === '<<=' ||
+            op === '>>=' ||
+            op === '>>>=' ||
+            op === '&=' ||
+            op === '^=' ||
+            op === '|=';
+    }
+
+
+    function consumeSemicolon() {
+        var token, line;
+
+        // Catch the very common case first.
+        if (source[index] === ';') {
+            lex();
+            return;
+        }
+
+        line = lineNumber;
+        skipComment();
+        if (lineNumber !== line) {
+            return;
+        }
+
+        if (match(';')) {
+            lex();
+            return;
+        }
+
+        token = lookahead();
+        if (token.type !== Token.EOF && !match('}')) {
+            throwUnexpected(token);
+        }
+        return;
+    }
+
+    // 11.1.4 Array Initialiser
+
+    function parseArrayInitialiser() {
+        var elements = [],
+            undef;
+
+        expect('[');
+
+        while (index < length) {
+            if (match(']')) {
+                lex();
+                break;
+            }
+
+            if (match(',')) {
+                lex();
+                elements.push(undef);
+            } else {
+                elements.push(parseAssignmentExpression());
+
+                if (match(']')) {
+                    lex();
+                    break;
+                }
+
+                expect(',');
+            }
+        }
+
+        return {
+            type: Syntax.ArrayExpression,
+            elements: elements
+        };
+    }
+
+    // 11.1.5 Object Initialiser
+
+    function parseObjectInitialiser() {
+        var token, expr, properties = [], property;
+
+        expect('{');
+
+        // TODO handle 'get' and 'set'
+        while (index < length) {
+            token = lex();
+            if (token.type === Token.Punctuator && token.value === '}') {
+                break;
+            }
+
+            property = {};
+            switch (token.type) {
+            case Token.Identifier:
+                property.key = {
+                    type: Syntax.Identifier,
+                    name: token.value
+                };
+
+                // Property Assignment: Getter and Setter.
+
+                if (token.value === 'get' && !match(':')) {
+                    token = lex();
+                    if (token.type !== Token.Identifier) {
+                        throwUnexpected(token);
+                    }
+                    expect('(');
+                    expect(')');
+                    property = {
+                        key: {
+                            type: Syntax.Identifier,
+                            name: token.value
+                        },
+                        value: {
+                            type: Syntax.FunctionExpression,
+                            id: null,
+                            params: [],
+                            body: parseBlock()
+                        },
+                        kind: 'get'
+                    };
+                    break;
+                }
+
+                if (token.value === 'set' && !match(':')) {
+                    token = lex();
+                    if (token.type !== Token.Identifier) {
+                        throwUnexpected(token);
+                    }
+                    property.key = {
+                        type: Syntax.Identifier,
+                        name: token.value
+                    };
+                    expect('(');
+                    token = lex();
+                    if (token.type !== Token.Identifier) {
+                        throwUnexpected(token);
+                    }
+                    expect(')');
+                    property.value = {
+                        type: Syntax.FunctionExpression,
+                        id: null,
+                        params: [{
+                            type: Syntax.Identifier,
+                            name: token.value
+                        }],
+                        body: parseBlock()
+                    };
+                    property.kind = 'set';
+                    break;
+                }
+
+                expect(':');
+                property.value = parseAssignmentExpression();
+                break;
+
+            case Token.StringLiteral:
+            case Token.NumericLiteral:
+                property.key = {
+                    type: Syntax.Literal,
+                    value: token.value
+                };
+                expect(':');
+                property.value = parseAssignmentExpression();
+                break;
+
+            default:
+                throwUnexpected(token);
+            }
+            properties.push(property);
+
+            token = lookahead();
+            if (token.type === Token.Punctuator && token.value === '}') {
+                lex();
+                break;
+            }
+            expect(',');
+        }
+
+        return {
+            type: Syntax.ObjectExpression,
+            properties: properties
+        };
+    }
+
+    // 11.1 Primary Expressions
+
+    function parsePrimaryExpression() {
+        var token, expr;
+
+        if (match('[')) {
+            return parseArrayInitialiser();
+        }
+
+        if (match('{')) {
+            return parseObjectInitialiser();
+        }
+
+        if (match('(')) {
+            lex();
+            expr = parseExpression();
+            expect(')');
+            return expr.expression;
+        }
+
+        if (matchKeyword('function')) {
+            return parseFunctionExpression();
+        }
+
+        if (matchKeyword('this')) {
+            lex();
+            return {
+                type: Syntax.ThisExpression
+            };
+        }
+
+        if (match('/') || match('/=')) {
+            return {
+                type: Syntax.Literal,
+                value: scanRegExp()
+            };
+        }
+
+        token = lex();
+
+        if (token.type === Token.Identifier) {
+            return {
+                type: Syntax.Identifier,
+                name: token.value
+            };
+        }
+
+        if (token.type === Token.BooleanLiteral) {
+            return {
+                type: Syntax.Literal,
+                value: (token.value === 'true')
+            };
+        }
+
+        if (token.type === Token.NullLiteral) {
+            return {
+                type: Syntax.Literal,
+                value: null
+            };
+        }
+
+        if (token.type === Token.NumericLiteral) {
+            return {
+                type: Syntax.Literal,
+                value: token.value
+            };
+        }
+
+        if (token.type === Token.StringLiteral) {
+            return {
+                type: Syntax.Literal,
+                value: token.value
+            };
+        }
+
+        return;
+    }
+
+    // 11.2 Left-Hand-Side Expressions
+
+    function parseArguments() {
+        var args = [];
+
+        expect('(');
+
+        if (!match(')')) {
+            while (index < length) {
+                args.push(parseAssignmentExpression());
+                if (match(')')) {
+                    break;
+                }
+                expect(',');
+            }
+        }
+
+        expect(')');
+
+        return args;
+    }
+
+    function parseMemberExpression() {
+        var expr, token, property;
+
+        expr = parsePrimaryExpression();
+
+        while (index < length) {
+            if (match('.')) {
+                lex();
+                token = lex();
+                if (token.type !== Token.Identifier) {
+                    throw new Error('Line ' + lineNumber +
+                        ': Expecting an identifier after dot (.)');
+                }
+                property = {
+                    type: Syntax.Identifier,
+                    name: token.value
+                };
+                expr = {
+                    type: Syntax.MemberExpression,
+                    computed: false,
+                    object: expr,
+                    property: property
+                };
+            } else if (match('[')) {
+                lex();
+                property = parseExpression();
+                if (property.type === Syntax.ExpressionStatement) {
+                    property = property.expression;
+                }
+                expr = {
+                    type: Syntax.MemberExpression,
+                    computed: true,
+                    object: expr,
+                    property: property
+                };
+                expect(']');
+            } else if (match('(')) {
+                expr = {
+                    type: Syntax.CallExpression,
+                    callee: expr,
+                    'arguments': parseArguments()
+                };
+            } else {
+                break;
+            }
+        }
+
+        return expr;
+    }
+
+    function parseLeftHandSideExpression() {
+        var useNew, expr, args;
+
+        useNew = matchKeyword('new');
+        if (useNew) {
+            // Read the keyword.
+            lex();
+            expr = parseLeftHandSideExpression();
+        } else {
+            expr = parseMemberExpression();
+        }
+
+        if (match('(')) {
+            args = parseArguments();
+        }
+
+        if (useNew) {
+
+            // Force to have at least an empty argument list.
+            if (typeof args === 'undefined') {
+                args = [];
+            }
+
+            // e.g. "new x()" thus adopt the CallExpression of "x()".
+            if (expr.type === Syntax.CallExpression) {
+                args = expr['arguments'];
+                expr = expr.callee;
+            }
+
+            return {
+                type: Syntax.NewExpression,
+                callee: expr,
+                'arguments': args
+            };
+        }
+
+        if (typeof args !== 'undefined') {
+            return {
+                type: Syntax.CallExpression,
+                callee: expr,
+                'arguments': args
+            };
+        }
+
+        return expr;
+    }
+
+    // 11.3 Postfix Expressions
+
+    function parsePostfixExpression() {
+        var expr = parseLeftHandSideExpression();
+
+        if ((match('++') || match('--')) && !peekLineTerminator()) {
+            expr = {
+                type: Syntax.UpdateExpression,
+                operator: lex().value,
+                argument: expr,
+                prefix: false
+            };
+        }
+
+        return expr;
+    }
+
+    // 11.4 Unary Operators
+
+    function parseUnaryExpression() {
+
+        if (match('++') || match('--')) {
+            return {
+                type: Syntax.UpdateExpression,
+                operator: lex().value,
+                argument: parseUnaryExpression(),
+                prefix: true
+            };
+        }
+
+        if (match('+') || match('-') || match('~') || match('!')) {
+            return {
+                type: Syntax.UnaryExpression,
+                operator: lex().value,
+                argument: parseUnaryExpression()
+            };
+        }
+
+        if (matchKeyword('delete') || matchKeyword('void') || matchKeyword('typeof')) {
+            return {
+                type: Syntax.UnaryExpression,
+                operator: lex().value,
+                argument: parseUnaryExpression()
+            };
+        }
+
+        return parsePostfixExpression();
+    }
+
+    // 11.5 Multiplicative Operators
+
+    function parseMultiplicativeExpression() {
+        var expr = parseUnaryExpression();
+
+        while (match('*') || match('/') || match('%')) {
+            expr = {
+                type: Syntax.BinaryExpression,
+                operator: lex().value,
+                left: expr,
+                right: parseUnaryExpression()
+            };
+        }
+
+        return expr;
+    }
+
+    // 11.6 Additive Operators
+
+    function parseAdditiveExpression() {
+        var expr = parseMultiplicativeExpression();
+
+        while (match('+') || match('-')) {
+            expr = {
+                type: Syntax.BinaryExpression,
+                operator: lex().value,
+                left: expr,
+                right: parseMultiplicativeExpression()
+            };
+        }
+
+        return expr;
+    }
+
+    // 11.7 Bitwise Shift Operators
+
+    function parseShiftExpression() {
+        var expr = parseAdditiveExpression();
+
+        while (match('<<') || match('>>') || match('>>>')) {
+            expr =  {
+                type: Syntax.BinaryExpression,
+                operator: lex().value,
+                left: expr,
+                right: parseAdditiveExpression()
+            };
+        }
+
+        return expr;
+    }
+
+    // 11.8 Relational Operators
+
+    function parseRelationalExpression() {
+        var expr = parseShiftExpression();
+
+        if (match('<') || match('>') || match('<=') || match('>=')) {
+            expr = {
+                type: Syntax.BinaryExpression,
+                operator: lex().value,
+                left: expr,
+                right: parseRelationalExpression()
+            };
+        } else if (matchKeyword('in')) {
+            lex();
+            expr = {
+                type: Syntax.BinaryExpression,
+                operator: 'in',
+                left: expr,
+                right: parseRelationalExpression()
+            };
+        } else if (matchKeyword('instanceof')) {
+            lex();
+            expr = {
+                type: Syntax.BinaryExpression,
+                operator: 'instanceof',
+                left: expr,
+                right: parseRelationalExpression()
+            };
+        }
+
+        return expr;
+    }
+
+    // 11.9 Equality Operators
+
+    function parseEqualityExpression() {
+        var expr = parseRelationalExpression();
+
+        while (match('==') || match('!=') || match('===') || match('!==')) {
+            expr = {
+                type: Syntax.BinaryExpression,
+                operator: lex().value,
+                left: expr,
+                right: parseRelationalExpression()
+            };
+        }
+
+        return expr;
+    }
+
+    // 11.10 Binary Bitwise Operators
+
+    function parseBitwiseANDExpression() {
+        var expr = parseEqualityExpression();
+
+        while (match('&')) {
+            lex();
+            expr = {
+                type: Syntax.BinaryExpression,
+                operator: '&',
+                left: expr,
+                right: parseEqualityExpression()
+            };
+        }
+
+        return expr;
+    }
+
+    function parseBitwiseORExpression() {
+        var expr = parseBitwiseANDExpression();
+
+        while (match('|')) {
+            lex();
+            expr = {
+                type: Syntax.BinaryExpression,
+                operator: '|',
+                left: expr,
+                right: parseBitwiseANDExpression()
+            };
+        }
+
+        return expr;
+    }
+
+    function parseBitwiseXORExpression() {
+        var expr = parseBitwiseORExpression();
+
+        while (match('^')) {
+            lex();
+            expr = {
+                type: Syntax.BinaryExpression,
+                operator: '^',
+                left: expr,
+                right: parseBitwiseORExpression()
+            };
+        }
+
+        return expr;
+    }
+
+    // 11.11 Binary Logical Operators
+
+    function parseLogicalANDExpression() {
+        var expr = parseBitwiseXORExpression();
+
+        while (match('&&')) {
+            lex();
+            expr = {
+                type: Syntax.LogicalExpression,
+                operator: '&&',
+                left: expr,
+                right: parseBitwiseXORExpression()
+            };
+        }
+
+        return expr;
+    }
+
+    function parseLogicalORExpression() {
+        var expr = parseLogicalANDExpression();
+
+        while (match('||')) {
+            lex();
+            expr = {
+                type: Syntax.LogicalExpression,
+                operator: '||',
+                left: expr,
+                right: parseLogicalANDExpression()
+            };
+        }
+
+        return expr;
+    }
+
+    // 11.12 Conditional Operator
+
+    function parseConditionalExpression() {
+        var token, expr;
+
+        token = lookahead();
+        expr = parseLogicalORExpression();
+        if (typeof expr === 'undefined') {
+            throwUnexpected(token);
+        }
+
+        if (match('?')) {
+            lex();
+            expr = {
+                type: Syntax.ConditionalExpression,
+                test: expr
+            };
+            expr.consequent = parseAssignmentExpression();
+            expect(':');
+            expr.alternate = parseAssignmentExpression();
+        }
+
+        return expr;
+    }
+
+    // 11.13 Assignment Operators
+
+    function parseAssignmentExpression() {
+
+        var expr = parseConditionalExpression();
+
+        if (matchAssign()) {
+            expr = {
+                type: Syntax.AssignmentExpression,
+                operator: lex().value,
+                left: expr,
+                right: parseAssignmentExpression()
+            };
+        }
+
+        return expr;
+    }
+
+    // 11.14 Comma Operator
+
+    function parseExpression() {
+        var expr = parseAssignmentExpression();
+
+        if (match(',')) {
+            expr = {
+                type: Syntax.SequenceExpression,
+                expressions: [ expr ]
+            };
+
+            while (index < length) {
+                if (!match(',')) {
+                    break;
+                }
+                lex();
+                expr.expressions.push(parseAssignmentExpression());
+            }
+        }
+
+        return {
+            type: Syntax.ExpressionStatement,
+            expression: expr
+        };
+    }
+
+    // 12.1 Block
+
+    function parseStatementList() {
+        var list = [],
+            statement;
+
+        while (index < length) {
+            if (match('}')) {
+                break;
+            }
+            statement = parseStatement();
+            if (typeof statement === 'undefined') {
+                break;
+            }
+            list.push(statement);
+        }
+
+        return list;
+    }
+
+    function parseBlock() {
+        var block;
+
+        expect('{');
+
+        block = parseStatementList();
+
+        expect('}');
+
+        return {
+            type: Syntax.BlockStatement,
+            body: block
+        };
+    }
+
+    // 12.2 Variable Statement
+
+    function parseVariableDeclaration() {
+        var token, id, init;
+
+        token = lex();
+        if (token.type !== Token.Identifier) {
+            throw new Error('Line ' + lineNumber + ': Expected an identifier');
+        }
+
+        id = {
+            type: Syntax.Identifier,
+            name: token.value
+        };
+
+        init = null;
+        if (match('=')) {
+            lex();
+            init = parseAssignmentExpression();
+        }
+
+        return {
+            id: id,
+            init: init
+        };
+    }
+
+    function parseVariableDeclarationList() {
+        var list = [];
+
+        while (index < length) {
+            list.push(parseVariableDeclaration());
+            if (!match(',')) {
+                break;
+            }
+            lex();
+        }
+
+        return list;
+    }
+
+    function parseVariableStatement() {
+        var declarations;
+
+        expectKeyword('var');
+
+        declarations = parseVariableDeclarationList();
+
+        consumeSemicolon();
+
+        return {
+            type: Syntax.VariableDeclaration,
+            declarations: declarations,
+            kind: 'var'
+        };
+    }
+
+    // http://wiki.ecmascript.org/doku.php?id=harmony:let.
+    // Warning: This is experimental and not in the specification yet.
+
+    function parseLetStatement() {
+        var declarations;
+
+        expectKeyword('let');
+
+        declarations = parseVariableDeclarationList();
+
+        consumeSemicolon();
+
+        return {
+            type: Syntax.VariableDeclaration,
+            declarations: declarations,
+            kind: 'let'
+        };
+    }
+
+    // 12.3 Empty Statement
+
+    function parseEmptyStatement() {
+        expect(';');
+
+        return {
+            type: Syntax.EmptyStatement
+        };
+    }
+
+    // 12.4 Expression Statement
+
+    function parseExpressionStatement() {
+        var expr = parseExpression();
+
+        consumeSemicolon();
+
+        return expr;
+    }
+
+    // 12.5 If statement
+
+    function parseIfStatement() {
+        var test, consequent, alternate;
+
+        expectKeyword('if');
+
+        expect('(');
+
+        test = parseExpression().expression;
+
+        expect(')');
+
+        consequent = parseStatement();
+
+        if (matchKeyword('else')) {
+            lex();
+            alternate = parseStatement();
+        } else {
+            alternate = null;
+        }
+
+        return {
+            type: Syntax.IfStatement,
+            test: test,
+            consequent: consequent,
+            alternate: alternate
+        };
+    }
+
+    // 12.6 Iteration Statements
+
+    function parseDoWhileStatement() {
+        var body, test;
+
+        expectKeyword('do');
+
+        body = parseStatement();
+
+        expectKeyword('while');
+
+        expect('(');
+
+        test = parseExpression().expression;
+
+        expect(')');
+
+        consumeSemicolon();
+
+        return {
+            type: Syntax.DoWhileStatement,
+            body: body,
+            test: test
+        };
+    }
+
+    function parseWhileStatement() {
+        var test, body;
+
+        expectKeyword('while');
+
+        expect('(');
+
+        test = parseExpression().expression;
+
+        expect(')');
+
+        body = parseStatement();
+
+        return {
+            type: Syntax.WhileStatement,
+            test: test,
+            body: body
+        };
+    }
+
+    function parseForStatement() {
+        var kind, init, test, update, left, right, body;
+
+        init = test = update = null;
+
+        expectKeyword('for');
+
+        expect('(');
+
+        if (match(';')) {
+            lex();
+        } else {
+            if (matchKeyword('var') || matchKeyword('let')) {
+                kind = lex().value;
+                init = {
+                    type: Syntax.VariableDeclaration,
+                    declarations: parseVariableDeclarationList(),
+                    kind: kind
+                };
+
+                if (matchKeyword('in')) {
+                    lex();
+                    left = init;
+                    right = parseExpression().expression;
+                    init = null;
+                }
+            } else {
+                init = parseExpression().expression;
+            }
+
+            if (typeof left === 'undefined') {
+                if (init.hasOwnProperty('operator') && init.operator === 'in') {
+                    left = init.left;
+                    right = init.right;
+                    init = null;
+                } else {
+                    expect(';');
+                }
+            }
+        }
+
+        if (typeof left === 'undefined') {
+
+            if (!match(';')) {
+                test = parseExpression().expression;
+            }
+            expect(';');
+
+            if (!match(')')) {
+                update = parseExpression().expression;
+            }
+        }
+
+        expect(')');
+
+        body = parseStatement();
+
+        if (typeof left === 'undefined') {
+            return {
+                type: Syntax.ForStatement,
+                init: init,
+                test: test,
+                update: update,
+                body: body
+            };
+        }
+
+        return {
+            type: Syntax.ForInStatement,
+            left: left,
+            right: right,
+            body: body,
+            each: false
+        };
+    }
+
+    // 12.7 The continue statement
+
+    function parseContinueStatement() {
+        var token, label = null;
+
+        expectKeyword('continue');
+
+        // Optimize the most common form: 'continue;'.
+        if (source[index] === ';') {
+            lex();
+            return {
+                type: Syntax.ContinueStatement,
+                label: null
+            };
+        }
+
+        if (peekLineTerminator()) {
+            return {
+                type: Syntax.ContinueStatement,
+                label: null
+            };
+        }
+
+        token = lookahead();
+        if (token.type === Token.Identifier) {
+            lex();
+            label = {
+                type: Syntax.Identifier,
+                name: token.value
+            };
+        }
+
+        consumeSemicolon();
+
+        return {
+            type: Syntax.ContinueStatement,
+            label: label
+        };
+    }
+
+    // 12.8 The break statement
+
+    function parseBreakStatement() {
+        var token, label = null;
+
+        expectKeyword('break');
+
+        // Optimize the most common form: 'break;'.
+        if (source[index] === ';') {
+            lex();
+            return {
+                type: Syntax.BreakStatement,
+                label: null
+            };
+        }
+
+        if (peekLineTerminator()) {
+            return {
+                type: Syntax.BreakStatement,
+                label: null
+            };
+        }
+
+        token = lookahead();
+        if (token.type === Token.Identifier) {
+            lex();
+            label = {
+                type: Syntax.Identifier,
+                name: token.value
+            };
+        }
+
+        consumeSemicolon();
+
+        return {
+            type: Syntax.BreakStatement,
+            label: label
+        };
+    }
+
+    // 12.9 The return statement
+
+    function parseReturnStatement() {
+        var token, argument = null;
+
+        expectKeyword('return');
+
+        // 'return' followed by a space and an identifier is very common.
+        if (source[index] === ' ') {
+            if (isIdentifierStart(source[index + 1])) {
+                argument = parseExpression().expression;
+                consumeSemicolon();
+                return {
+                    type: Syntax.ReturnStatement,
+                    argument: argument
+                };
+            }
+        }
+
+        if (peekLineTerminator()) {
+            return {
+                type: Syntax.ReturnStatement,
+                argument: null
+            };
+        }
+
+        if (!match(';')) {
+            token = lookahead();
+            if (!match('}') && token.type !== Token.EOF) {
+                argument = parseExpression().expression;
+            }
+        }
+
+        consumeSemicolon();
+
+        return {
+            type: Syntax.ReturnStatement,
+            argument: argument
+        };
+    }
+
+    // 12.10 The with statement
+
+    function parseWithStatement() {
+        var object, body;
+
+        expectKeyword('with');
+
+        expect('(');
+
+        object = parseExpression().expression;
+
+        expect(')');
+
+        body = parseStatement();
+
+        return {
+            type: Syntax.WithStatement,
+            object: object,
+            body: body
+        };
+    }
+
+    // 12.10 The swith statement
+
+    function parseSwitchConsequent() {
+        var consequent = [],
+            statement;
+
+        while (index < length) {
+            if (match('}') || matchKeyword('default') || matchKeyword('case')) {
+                break;
+            }
+            statement = parseStatement();
+            if (typeof statement === 'undefined') {
+                break;
+            }
+            consequent.push(statement);
+        }
+
+        return consequent;
+    }
+
+    function parseSwitchStatement() {
+        var discriminant, cases, test, consequent, statement;
+
+        expectKeyword('switch');
+
+        expect('(');
+
+        discriminant = parseExpression().expression;
+
+        expect(')');
+
+        expect('{');
+
+        if (match('}')) {
+            lex();
+            return {
+                type: Syntax.SwitchStatement,
+                discriminant: discriminant
+            };
+        }
+
+        cases = [];
+
+        while (index < length) {
+            if (match('}')) {
+                break;
+            }
+
+            if (matchKeyword('default')) {
+                lex();
+                test = null;
+            } else {
+                expectKeyword('case');
+                test = parseExpression().expression;
+            }
+            expect(':');
+
+            cases.push({
+                type: Syntax.SwitchCase,
+                test: test,
+                consequent: parseSwitchConsequent()
+            });
+        }
+
+        expect('}');
+
+        return {
+            type: Syntax.SwitchStatement,
+            discriminant: discriminant,
+            cases: cases
+        };
+    }
+
+    // 12.13 The throw statement
+
+    function parseThrowStatement() {
+        var argument;
+
+        expectKeyword('throw');
+
+        if (peekLineTerminator()) {
+            throw new Error('Line ' + lineNumber +
+                ': Unexpected line terminator after throw');
+        }
+
+        argument = parseExpression().expression;
+
+        consumeSemicolon();
+
+        return {
+            type: Syntax.ThrowStatement,
+            argument: argument
+        };
+    }
+
+    // 12.14 The try statement
+
+    function parseTryStatement() {
+        var block, handlers = [], param, finalizer = null;
+
+        expectKeyword('try');
+
+        block = parseBlock();
+
+        if (matchKeyword('catch')) {
+            lex();
+            expect('(');
+            if (!match(')')) {
+                param = parseExpression().expression;
+            }
+            expect(')');
+
+            handlers.push({
+                type: Syntax.CatchClause,
+                param: param,
+                guard: null,
+                body: parseBlock()
+            });
+        }
+
+        if (matchKeyword('finally')) {
+            lex();
+            finalizer = parseBlock();
+        }
+
+        return {
+            type: Syntax.TryStatement,
+            block: block,
+            handlers: handlers,
+            finalizer: finalizer
+        };
+    }
+
+    // 12.15 The debugger statement
+
+    function parseDebuggerStatement() {
+        expectKeyword('debugger');
+
+        consumeSemicolon();
+
+        return {
+            type: Syntax.DebuggerStatement
+        };
+    }
+
+    // 12 Statements
+
+    function parseStatement() {
+        var token = lookahead(),
+            stat;
+
+        if (token.type === Token.EOF) {
+            return;
+        }
+
+        if (token.type === Token.Punctuator) {
+            switch (token.value) {
+            case ';':
+                return parseEmptyStatement();
+            case '{':
+                return parseBlock();
+            case '(':
+                return parseExpressionStatement();
+            default:
+                break;
+            }
+        }
+
+        if (token.type === Token.Keyword) {
+            switch (token.value) {
+            case 'break':
+                return parseBreakStatement();
+            case 'continue':
+                return parseContinueStatement();
+            case 'debugger':
+                return parseDebuggerStatement();
+            case 'do':
+                return parseDoWhileStatement();
+            case 'for':
+                return parseForStatement();
+            case 'if':
+                return parseIfStatement();
+            case 'let':
+                return parseLetStatement();
+            case 'return':
+                return parseReturnStatement();
+            case 'switch':
+                return parseSwitchStatement();
+            case 'throw':
+                return parseThrowStatement();
+            case 'try':
+                return parseTryStatement();
+            case 'var':
+                return parseVariableStatement();
+            case 'while':
+                return parseWhileStatement();
+            case 'with':
+                return parseWithStatement();
+            default:
+                break;
+            }
+        }
+
+        stat = parseExpression();
+
+        if (stat.expression.type === Syntax.FunctionExpression) {
+            if (stat.expression.id !== null) {
+                return {
+                    type: Syntax.FunctionDeclaration,
+                    id: stat.expression.id,
+                    params: stat.expression.params,
+                    body: stat.expression.body
+                };
+            }
+        }
+
+        // 12.12 Labelled Statements
+        if ((stat.expression.type === Syntax.Identifier) && match(':')) {
+            lex();
+            return {
+                type: Syntax.LabeledStatement,
+                label: stat.expression,
+                body: parseStatement()
+            };
+        }
+
+        consumeSemicolon();
+
+        return stat;
+    }
+
+    // 13 Function Definition
+
+    function parseFunctionDeclaration() {
+        var token, id = null, params = [], body;
+
+        expectKeyword('function');
+
+        token = lex();
+        if (token.type !== Token.Identifier) {
+            throwUnexpected(token);
+        }
+        id = {
+            type: Syntax.Identifier,
+            name: token.value
+        };
+
+        expect('(');
+
+        if (!match(')')) {
+            while (index < length) {
+                token = lex();
+                if (token.type !== Token.Identifier) {
+                    throwUnexpected(token);
+                }
+                params.push({
+                    type: Syntax.Identifier,
+                    name: token.value
+                });
+                if (match(')')) {
+                    break;
+                }
+                expect(',');
+            }
+        }
+
+        expect(')');
+
+        body = parseBlock();
+
+        return {
+            type: Syntax.FunctionDeclaration,
+            id: id,
+            params: params,
+            body: body
+        };
+    }
+
+    function parseFunctionExpression() {
+        var token, id = null, params = [], body;
+
+        expectKeyword('function');
+
+        if (!match('(')) {
+            token = lex();
+            if (token.type !== Token.Identifier) {
+                throwUnexpected(token);
+            }
+            id = {
+                type: Syntax.Identifier,
+                name: token.value
+            };
+        }
+
+        expect('(');
+
+        if (!match(')')) {
+            while (index < length) {
+                token = lex();
+                if (token.type !== Token.Identifier) {
+                    throwUnexpected(token);
+                }
+                params.push({
+                    type: Syntax.Identifier,
+                    name: token.value
+                });
+                if (match(')')) {
+                    break;
+                }
+                expect(',');
+            }
+        }
+
+        expect(')');
+
+        body = parseBlock();
+
+        return {
+            type: Syntax.FunctionExpression,
+            id: id,
+            params: params,
+            body: body
+        };
+    }
+
+    // 14 Program
+
+    function parseSourceElement() {
+        var token;
+
+        token = lookahead();
+        if (token.type === Token.EOF) {
+            return;
+        }
+
+        if (matchKeyword('function')) {
+            return parseFunctionDeclaration();
+        }
+
+        return parseStatement();
+    }
+
+    function parseSourceElements() {
+        var sourceElement, sourceElements = [];
+
+        while (index < length) {
+            sourceElement = parseSourceElement();
+            if (typeof sourceElement === 'undefined') {
+                break;
+            }
+            sourceElements.push(sourceElement);
+        }
+        return sourceElements;
+    }
+
+    function parseProgram() {
+        return {
+            type: Syntax.Program,
+            body: parseSourceElements()
+        };
+    }
+
+    // The following functions are needed only when the option to preserve
+    // the comments is active.
+
+    function scanComment() {
+        var comment, ch, start, blockComment, lineComment;
+
+        comment = '';
+        blockComment = false;
+        lineComment = false;
+
+        while (index < length) {
+            ch = source[index];
+
+            if (lineComment) {
+                ch = nextChar();
+                if (isLineTerminator(ch)) {
+                    lineComment = false;
+                    lineNumber += 1;
+                    comments.push({
+                        range: [start, index - 1],
+                        type: 'Line',
+                        value: comment
+                    });
+                    comment = '';
+                } else {
+                    comment += ch;
+                }
+            } else if (blockComment) {
+                ch = nextChar();
+                comment += ch;
+                if (ch === '*') {
+                    ch = source[index];
+                    if (ch === '/') {
+                        comment = comment.substr(0, comment.length - 1);
+                        blockComment = false;
+                        nextChar();
+                        comments.push({
+                            range: [start, index - 1],
+                            type: 'Block',
+                            value: comment
+                        });
+                        comment = '';
+                    }
+                } else if (isLineTerminator(ch)) {
+                    lineNumber += 1;
+                }
+            } else if (ch === '/') {
+                ch = source[index + 1];
+                if (ch === '/') {
+                    start = index;
+                    nextChar();
+                    nextChar();
+                    lineComment = true;
+                } else if (ch === '*') {
+                    start = index;
+                    nextChar();
+                    nextChar();
+                    blockComment = true;
+                } else {
+                    break;
+                }
+            } else if (isWhiteSpace(ch)) {
+                nextChar();
+            } else if (isLineTerminator(ch)) {
+                nextChar();
+                lineNumber += 1;
+            } else {
+                break;
+            }
+        }
+
+        if (comment.length > 0) {
+            comments.push({
+                range: [start, index],
+                type: (blockComment) ? 'Block' : 'Line',
+                value: comment
+            });
+        }
+    }
+
+    exports.parse = function (code, options) {
+
+        var program,
+            comment = false,
+            original = {};
+
+        if (typeof options !== 'undefined') {
+            if (typeof options.comment === 'boolean') {
+                comment = options.comment;
+            }
+        }
+
+        source = code;
+        index = 0;
+        lineNumber = (source.length > 0) ? 1 : 0;
+        length = source.length;
+        buffer = null;
+
+        if (comment) {
+            // Run-time patching.
+            comments = [];
+            original.skipComment = skipComment;
+            skipComment = scanComment;
+        }
+
+        program = parseProgram();
+
+        if (comment) {
+            program.comments = comments;
+            skipComment = original.skipComment;
+            comments = [];
+        }
+
+        return program;
+    };
+
+    // Sync with package.json.
+    exports.version = '0.9.4';
+
+}(typeof exports === 'undefined' ? (esprima = {}) : exports));
\ No newline at end of file

 phantom.injectJs('casper.js');
+phantom.injectJs('lib/vendors/esprima.js');
 
 var fs = require('fs');
 var casper = new phantom.Casper({