blob: 691c4e11e7783eafefb191d66b4a9fce3f2ecfbe [file] [log] [blame]
var esprima = {};
(function (exports) {
'use strict';
var Token,
TokenName,
FnExprTokens,
Syntax,
PlaceHolders,
Messages,
Regex,
source,
strict,
index,
lineNumber,
lineStart,
hasLineTerminator,
lastIndex,
lastLineNumber,
lastLineStart,
startIndex,
startLineNumber,
startLineStart,
scanning,
length,
lookahead,
state,
extra,
isBindingElement,
isAssignmentTarget,
firstCoverInitializedNameError;
Token = {
BooleanLiteral: 1,
EOF: 2,
Identifier: 3,
Keyword: 4,
NullLiteral: 5,
NumericLiteral: 6,
Punctuator: 7,
StringLiteral: 8,
RegularExpression: 9,
Template: 10
};
TokenName = {};
TokenName[Token.BooleanLiteral] = 'Boolean';
TokenName[Token.EOF] = '<end>';
TokenName[Token.Identifier] = 'Identifier';
TokenName[Token.Keyword] = 'Keyword';
TokenName[Token.NullLiteral] = 'Null';
TokenName[Token.NumericLiteral] = 'Numeric';
TokenName[Token.Punctuator] = 'Punctuator';
TokenName[Token.StringLiteral] = 'String';
TokenName[Token.RegularExpression] = 'RegularExpression';
TokenName[Token.Template] = 'Template';
FnExprTokens = ['(', '{', '[', 'in', 'typeof', 'instanceof', 'new',
'return', 'case', 'delete', 'throw', 'void',
'=', '+=', '-=', '*=', '/=', '%=', '<<=', '>>=', '>>>=',
'&=', '|=', '^=', ',',
'+', '-', '*', '/', '%', '++', '--', '<<', '>>', '>>>', '&',
'|', '^', '!', '~', '&&', '||', '?', ':', '===', '==', '>=',
'<=', '<', '>', '!=', '!=='];
Syntax = {
AssignmentExpression: 'AssignmentExpression',
AssignmentPattern: 'AssignmentPattern',
ArrayExpression: 'ArrayExpression',
ArrayPattern: 'ArrayPattern',
ArrowFunctionExpression: 'ArrowFunctionExpression',
BlockStatement: 'BlockStatement',
BinaryExpression: 'BinaryExpression',
BreakStatement: 'BreakStatement',
CallExpression: 'CallExpression',
CatchClause: 'CatchClause',
ClassBody: 'ClassBody',
ClassDeclaration: 'ClassDeclaration',
ClassExpression: 'ClassExpression',
ConditionalExpression: 'ConditionalExpression',
ContinueStatement: 'ContinueStatement',
DoWhileStatement: 'DoWhileStatement',
DebuggerStatement: 'DebuggerStatement',
EmptyStatement: 'EmptyStatement',
ExportAllDeclaration: 'ExportAllDeclaration',
ExportDefaultDeclaration: 'ExportDefaultDeclaration',
ExportNamedDeclaration: 'ExportNamedDeclaration',
ExportSpecifier: 'ExportSpecifier',
ExpressionStatement: 'ExpressionStatement',
ForStatement: 'ForStatement',
ForOfStatement: 'ForOfStatement',
ForInStatement: 'ForInStatement',
FunctionDeclaration: 'FunctionDeclaration',
FunctionExpression: 'FunctionExpression',
Identifier: 'Identifier',
IfStatement: 'IfStatement',
ImportDeclaration: 'ImportDeclaration',
ImportDefaultSpecifier: 'ImportDefaultSpecifier',
ImportNamespaceSpecifier: 'ImportNamespaceSpecifier',
ImportSpecifier: 'ImportSpecifier',
Literal: 'Literal',
LabeledStatement: 'LabeledStatement',
LogicalExpression: 'LogicalExpression',
MemberExpression: 'MemberExpression',
MetaProperty: 'MetaProperty',
MethodDefinition: 'MethodDefinition',
NewExpression: 'NewExpression',
ObjectExpression: 'ObjectExpression',
ObjectPattern: 'ObjectPattern',
Program: 'Program',
Property: 'Property',
RestElement: 'RestElement',
ReturnStatement: 'ReturnStatement',
SequenceExpression: 'SequenceExpression',
SpreadElement: 'SpreadElement',
Super: 'Super',
SwitchCase: 'SwitchCase',
SwitchStatement: 'SwitchStatement',
TaggedTemplateExpression: 'TaggedTemplateExpression',
TemplateElement: 'TemplateElement',
TemplateLiteral: 'TemplateLiteral',
ThisExpression: 'ThisExpression',
ThrowStatement: 'ThrowStatement',
TryStatement: 'TryStatement',
UnaryExpression: 'UnaryExpression',
UpdateExpression: 'UpdateExpression',
VariableDeclaration: 'VariableDeclaration',
VariableDeclarator: 'VariableDeclarator',
WhileStatement: 'WhileStatement',
WithStatement: 'WithStatement',
YieldExpression: 'YieldExpression'
};
PlaceHolders = {
ArrowParameterPlaceHolder: 'ArrowParameterPlaceHolder'
};
Messages = {
UnexpectedToken: 'Unexpected token %0',
UnexpectedNumber: 'Unexpected number',
UnexpectedString: 'Unexpected string',
UnexpectedIdentifier: 'Unexpected identifier',
UnexpectedReserved: 'Unexpected reserved word',
UnexpectedTemplate: 'Unexpected quasi %0',
UnexpectedEOS: 'Unexpected end of input',
NewlineAfterThrow: 'Illegal newline after throw',
InvalidRegExp: 'Invalid regular expression',
UnterminatedRegExp: 'Invalid regular expression: missing /',
InvalidLHSInAssignment: 'Invalid left-hand side in assignment',
InvalidLHSInForIn: 'Invalid left-hand side in for-in',
InvalidLHSInForLoop: 'Invalid left-hand side in for-loop',
MultipleDefaultsInSwitch: 'More than one default clause in switch statement',
NoCatchOrFinally: 'Missing catch or finally after try',
UnknownLabel: 'Undefined label \'%0\'',
Redeclaration: '%0 \'%1\' has already been declared',
IllegalContinue: 'Illegal continue statement',
IllegalBreak: 'Illegal break statement',
IllegalReturn: 'Illegal return statement',
StrictModeWith: 'Strict mode code may not include a with statement',
StrictCatchVariable: 'Catch variable may not be eval or arguments in strict mode',
StrictVarName: 'Variable name may not be eval or arguments in strict mode',
StrictParamName: 'Parameter name eval or arguments is not allowed in strict mode',
StrictParamDupe: 'Strict mode function may not have duplicate parameter names',
StrictFunctionName: 'Function name may not be eval or arguments in strict mode',
StrictOctalLiteral: 'Octal literals are not allowed in strict mode.',
StrictDelete: 'Delete of an unqualified identifier in strict mode.',
StrictLHSAssignment: 'Assignment to eval or arguments is not allowed in strict mode',
StrictLHSPostfix: 'Postfix increment/decrement may not have eval or arguments operand in strict mode',
StrictLHSPrefix: 'Prefix increment/decrement may not have eval or arguments operand in strict mode',
StrictReservedWord: 'Use of future reserved word in strict mode',
TemplateOctalLiteral: 'Octal literals are not allowed in template strings.',
ParameterAfterRestParameter: 'Rest parameter must be last formal parameter',
DefaultRestParameter: 'Unexpected token =',
ObjectPatternAsRestParameter: 'Unexpected token {',
DuplicateProtoProperty: 'Duplicate __proto__ fields are not allowed in object literals',
ConstructorSpecialMethod: 'Class constructor may not be an accessor',
DuplicateConstructor: 'A class may only have one constructor',
StaticPrototype: 'Classes may not have static property named prototype',
MissingFromClause: 'Unexpected token',
NoAsAfterImportNamespace: 'Unexpected token',
InvalidModuleSpecifier: 'Unexpected token',
IllegalImportDeclaration: 'Unexpected token',
IllegalExportDeclaration: 'Unexpected token',
DuplicateBinding: 'Duplicate binding %0'
};
Regex = {
NonAsciiIdentifierStart: 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NonAsciiIdentifierPart: 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};
function assert(condition, message) {
if (!condition) {
throw new Error('ASSERT: ' + message);
}
}
function isDecimalDigit(ch) {
return (ch >= 0x30 && ch <= 0x39);
}
function isHexDigit(ch) {
return '0123456789abcdefABCDEF'.indexOf(ch) >= 0;
}
function isOctalDigit(ch) {
return '01234567'.indexOf(ch) >= 0;
}
function octalToDecimal(ch) {
var octal = (ch !== '0'), code = '01234567'.indexOf(ch);
if (index < length && isOctalDigit(source[index])) {
octal = true;
code = code * 8 + '01234567'.indexOf(source[index++]);
if ('0123'.indexOf(ch) >= 0 &&
index < length &&
isOctalDigit(source[index])) {
code = code * 8 + '01234567'.indexOf(source[index++]);
}
}
return {
code: code,
octal: octal
};
}
function isWhiteSpace(ch) {
return (ch === 0x20) || (ch === 0x09) || (ch === 0x0B) || (ch === 0x0C) || (ch === 0xA0) ||
(ch >= 0x1680 && [0x1680, 0x180E, 0x2000, 0x2001, 0x2002, 0x2003, 0x2004, 0x2005, 0x2006, 0x2007, 0x2008, 0x2009, 0x200A, 0x202F, 0x205F, 0x3000, 0xFEFF].indexOf(ch) >= 0);
}
function isLineTerminator(ch) {
return (ch === 0x0A) || (ch === 0x0D) || (ch === 0x2028) || (ch === 0x2029);
}
function fromCodePoint(cp) {
return (cp < 0x10000) ? String.fromCharCode(cp) :
String.fromCharCode(0xD800 + ((cp - 0x10000) >> 10)) +
String.fromCharCode(0xDC00 + ((cp - 0x10000) & 1023));
}
function isIdentifierStart(ch) {
return (ch === 0x24) || (ch === 0x5F) ||
(ch >= 0x41 && ch <= 0x5A) ||
(ch >= 0x61 && ch <= 0x7A) ||
(ch === 0x5C) ||
((ch >= 0x80) && Regex.NonAsciiIdentifierStart.test(fromCodePoint(ch)));
}
function isIdentifierPart(ch) {
return (ch === 0x24) || (ch === 0x5F) ||
(ch >= 0x41 && ch <= 0x5A) ||
(ch >= 0x61 && ch <= 0x7A) ||
(ch >= 0x30 && ch <= 0x39) ||
(ch === 0x5C) ||
((ch >= 0x80) && Regex.NonAsciiIdentifierPart.test(fromCodePoint(ch)));
}
function isFutureReservedWord(id) {
switch (id) {
case 'enum':
case 'export':
case 'import':
case 'super':
return true;
default:
return false;
}
}
function isStrictModeReservedWord(id) {
switch (id) {
case 'implements':
case 'interface':
case 'package':
case 'private':
case 'protected':
case 'public':
case 'static':
case 'yield':
case 'let':
return true;
default:
return false;
}
}
function isRestrictedWord(id) {
return id === 'eval' || id === 'arguments';
}
function isKeyword(id) {
switch (id.length) {
case 2:
return (id === 'if') || (id === 'in') || (id === 'do');
case 3:
return (id === 'var') || (id === 'for') || (id === 'new') ||
(id === 'try') || (id === 'let');
case 4:
return (id === 'this') || (id === 'else') || (id === 'case') ||
(id === 'void') || (id === 'with') || (id === 'enum');
case 5:
return (id === 'while') || (id === 'break') || (id === 'catch') ||
(id === 'throw') || (id === 'const') || (id === 'yield') ||
(id === 'class') || (id === 'super');
case 6:
return (id === 'return') || (id === 'typeof') || (id === 'delete') ||
(id === 'switch') || (id === 'export') || (id === 'import');
case 7:
return (id === 'default') || (id === 'finally') || (id === 'extends');
case 8:
return (id === 'function') || (id === 'continue') || (id === 'debugger');
case 10:
return (id === 'instanceof');
default:
return false;
}
}
function addComment(type, value, start, end, loc) {
var comment;
assert(typeof start === 'number', 'Comment must have valid position');
state.lastCommentStart = start;
comment = {
type: type,
value: value
};
if (extra.range) {
comment.range = [start, end];
}
if (extra.loc) {
comment.loc = loc;
}
extra.comments.push(comment);
if (extra.attachComment) {
extra.leadingComments.push(comment);
extra.trailingComments.push(comment);
}
}
function skipSingleLineComment(offset) {
var start, loc, ch, comment;
start = index - offset;
loc = {
start: {
line: lineNumber,
column: index - lineStart - offset
}
};
while (index < length) {
ch = source.charCodeAt(index);
++index;
if (isLineTerminator(ch)) {
hasLineTerminator = true;
if (extra.comments) {
comment = source.slice(start + offset, index - 1);
loc.end = {
line: lineNumber,
column: index - lineStart - 1
};
addComment('Line', comment, start, index - 1, loc);
}
if (ch === 13 && source.charCodeAt(index) === 10) {
++index;
}
++lineNumber;
lineStart = index;
return;
}
}
if (extra.comments) {
comment = source.slice(start + offset, index);
loc.end = {
line: lineNumber,
column: index - lineStart
};
addComment('Line', comment, start, index, loc);
}
}
function skipMultiLineComment() {
var start, loc, ch, comment;
if (extra.comments) {
start = index - 2;
loc = {
start: {
line: lineNumber,
column: index - lineStart - 2
}
};
}
while (index < length) {
ch = source.charCodeAt(index);
if (isLineTerminator(ch)) {
if (ch === 0x0D && source.charCodeAt(index + 1) === 0x0A) {
++index;
}
hasLineTerminator = true;
++lineNumber;
++index;
lineStart = index;
} else if (ch === 0x2A) {
if (source.charCodeAt(index + 1) === 0x2F) {
++index;
++index;
if (extra.comments) {
comment = source.slice(start + 2, index - 2);
loc.end = {
line: lineNumber,
column: index - lineStart
};
addComment('Block', comment, start, index, loc);
}
return;
}
++index;
} else {
++index;
}
}
if (extra.comments) {
loc.end = {
line: lineNumber,
column: index - lineStart
};
comment = source.slice(start + 2, index);
addComment('Block', comment, start, index, loc);
}
tolerateUnexpectedToken();
}
function skipComment() {
var ch, start;
hasLineTerminator = false;
start = (index === 0);
while (index < length) {
ch = source.charCodeAt(index);
if (isWhiteSpace(ch)) {
++index;
} else if (isLineTerminator(ch)) {
hasLineTerminator = true;
++index;
if (ch === 0x0D && source.charCodeAt(index) === 0x0A) {
++index;
}
++lineNumber;
lineStart = index;
start = true;
} else if (ch === 0x2F) {
ch = source.charCodeAt(index + 1);
if (ch === 0x2F) {
++index;
++index;
skipSingleLineComment(2);
start = true;
} else if (ch === 0x2A) {
++index;
++index;
skipMultiLineComment();
} else {
break;
}
} else if (start && ch === 0x2D) {
if ((source.charCodeAt(index + 1) === 0x2D) && (source.charCodeAt(index + 2) === 0x3E)) {
index += 3;
skipSingleLineComment(3);
} else {
break;
}
} else if (ch === 0x3C) {
if (source.slice(index + 1, index + 4) === '!--') {
++index;
++index;
++index;
++index;
skipSingleLineComment(4);
} else {
break;
}
} else {
break;
}
}
}
function scanHexEscape(prefix) {
var i, len, ch, code = 0;
len = (prefix === 'u') ? 4 : 2;
for (i = 0; i < len; ++i) {
if (index < length && isHexDigit(source[index])) {
ch = source[index++];
code = code * 16 + '0123456789abcdef'.indexOf(ch.toLowerCase());
} else {
return '';
}
}
return String.fromCharCode(code);
}
function scanUnicodeCodePointEscape() {
var ch, code;
ch = source[index];
code = 0;
if (ch === '}') {
throwUnexpectedToken();
}
while (index < length) {
ch = source[index++];
if (!isHexDigit(ch)) {
break;
}
code = code * 16 + '0123456789abcdef'.indexOf(ch.toLowerCase());
}
if (code > 0x10FFFF || ch !== '}') {
throwUnexpectedToken();
}
return fromCodePoint(code);
}
function codePointAt(i) {
var cp, first, second;
cp = source.charCodeAt(i);
if (cp >= 0xD800 && cp <= 0xDBFF) {
second = source.charCodeAt(i + 1);
if (second >= 0xDC00 && second <= 0xDFFF) {
first = cp;
cp = (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
}
}
return cp;
}
function getComplexIdentifier() {
var cp, ch, id;
cp = codePointAt(index);
id = fromCodePoint(cp);
index += id.length;
if (cp === 0x5C) {
if (source.charCodeAt(index) !== 0x75) {
throwUnexpectedToken();
}
++index;
if (source[index] === '{') {
++index;
ch = scanUnicodeCodePointEscape();
} else {
ch = scanHexEscape('u');
cp = ch.charCodeAt(0);
if (!ch || ch === '\\' || !isIdentifierStart(cp)) {
throwUnexpectedToken();
}
}
id = ch;
}
while (index < length) {
cp = codePointAt(index);
if (!isIdentifierPart(cp)) {
break;
}
ch = fromCodePoint(cp);
id += ch;
index += ch.length;
if (cp === 0x5C) {
id = id.substr(0, id.length - 1);
if (source.charCodeAt(index) !== 0x75) {
throwUnexpectedToken();
}
++index;
if (source[index] === '{') {
++index;
ch = scanUnicodeCodePointEscape();
} else {
ch = scanHexEscape('u');
cp = ch.charCodeAt(0);
if (!ch || ch === '\\' || !isIdentifierPart(cp)) {
throwUnexpectedToken();
}
}
id += ch;
}
}
return id;
}
function getIdentifier() {
var start, ch;
start = index++;
while (index < length) {
ch = source.charCodeAt(index);
if (ch === 0x5C) {
index = start;
return getComplexIdentifier();
} else if (ch >= 0xD800 && ch < 0xDFFF) {
index = start;
return getComplexIdentifier();
}
if (isIdentifierPart(ch)) {
++index;
} else {
break;
}
}
return source.slice(start, index);
}
function scanIdentifier() {
var start, id, type;
start = index;
id = (source.charCodeAt(index) === 0x5C) ? getComplexIdentifier() : getIdentifier();
if (id.length === 1) {
type = Token.Identifier;
} else if (isKeyword(id)) {
type = Token.Keyword;
} else if (id === 'null') {
type = Token.NullLiteral;
} else if (id === 'true' || id === 'false') {
type = Token.BooleanLiteral;
} else {
type = Token.Identifier;
}
return {
type: type,
value: id,
lineNumber: lineNumber,
lineStart: lineStart,
start: start,
end: index
};
}
function scanPunctuator() {
var token, str;
token = {
type: Token.Punctuator,
value: '',
lineNumber: lineNumber,
lineStart: lineStart,
start: index,
end: index
};
str = source[index];
switch (str) {
case '(':
if (extra.tokenize) {
extra.openParenToken = extra.tokens.length;
}
++index;
break;
case '{':
if (extra.tokenize) {
extra.openCurlyToken = extra.tokens.length;
}
state.curlyStack.push('{');
++index;
break;
case '.':
++index;
if (source[index] === '.' && source[index + 1] === '.') {
index += 2;
str = '...';
}
break;
case '}':
++index;
state.curlyStack.pop();
break;
case ')':
case ';':
case ',':
case '[':
case ']':
case ':':
case '?':
case '~':
++index;
break;
default:
str = source.substr(index, 4);
if (str === '>>>=') {
index += 4;
} else {
str = str.substr(0, 3);
if (str === '===' || str === '!==' || str === '>>>' ||
str === '<<=' || str === '>>=') {
index += 3;
} else {
str = str.substr(0, 2);
if (str === '&&' || str === '||' || str === '==' || str === '!=' ||
str === '+=' || str === '-=' || str === '*=' || str === '/=' ||
str === '++' || str === '--' || str === '<<' || str === '>>' ||
str === '&=' || str === '|=' || str === '^=' || str === '%=' ||
str === '<=' || str === '>=' || str === '=>') {
index += 2;
} else {
str = source[index];
if ('<>=!+-*%&|^/'.indexOf(str) >= 0) {
++index;
}
}
}
}
}
if (index === token.start) {
throwUnexpectedToken();
}
token.end = index;
token.value = str;
return token;
}
function scanHexLiteral(start) {
var number = '';
while (index < length) {
if (!isHexDigit(source[index])) {
break;
}
number += source[index++];
}
if (number.length === 0) {
throwUnexpectedToken();
}
if (isIdentifierStart(source.charCodeAt(index))) {
throwUnexpectedToken();
}
return {
type: Token.NumericLiteral,
value: parseInt('0x' + number, 16),
lineNumber: lineNumber,
lineStart: lineStart,
start: start,
end: index
};
}
function scanBinaryLiteral(start) {
var ch, number;
number = '';
while (index < length) {
ch = source[index];
if (ch !== '0' && ch !== '1') {
break;
}
number += source[index++];
}
if (number.length === 0) {
throwUnexpectedToken();
}
if (index < length) {
ch = source.charCodeAt(index);
if (isIdentifierStart(ch) || isDecimalDigit(ch)) {
throwUnexpectedToken();
}
}
return {
type: Token.NumericLiteral,
value: parseInt(number, 2),
lineNumber: lineNumber,
lineStart: lineStart,
start: start,
end: index
};
}
function scanOctalLiteral(prefix, start) {
var number, octal;
if (isOctalDigit(prefix)) {
octal = true;
number = '0' + source[index++];
} else {
octal = false;
++index;
number = '';
}
while (index < length) {
if (!isOctalDigit(source[index])) {
break;
}
number += source[index++];
}
if (!octal && number.length === 0) {
throwUnexpectedToken();
}
if (isIdentifierStart(source.charCodeAt(index)) || isDecimalDigit(source.charCodeAt(index))) {
throwUnexpectedToken();
}
return {
type: Token.NumericLiteral,
value: parseInt(number, 8),
octal: octal,
lineNumber: lineNumber,
lineStart: lineStart,
start: start,
end: index
};
}
function isImplicitOctalLiteral() {
var i, ch;
for (i = index + 1; i < length; ++i) {
ch = source[i];
if (ch === '8' || ch === '9') {
return false;
}
if (!isOctalDigit(ch)) {
return true;
}
}
return true;
}
function scanNumericLiteral() {
var number, start, ch;
ch = source[index];
assert(isDecimalDigit(ch.charCodeAt(0)) || (ch === '.'),
'Numeric literal must start with a decimal digit or a decimal point');
start = index;
number = '';
if (ch !== '.') {
number = source[index++];
ch = source[index];
if (number === '0') {
if (ch === 'x' || ch === 'X') {
++index;
return scanHexLiteral(start);
}
if (ch === 'b' || ch === 'B') {
++index;
return scanBinaryLiteral(start);
}
if (ch === 'o' || ch === 'O') {
return scanOctalLiteral(ch, start);
}
if (isOctalDigit(ch)) {
if (isImplicitOctalLiteral()) {
return scanOctalLiteral(ch, start);
}
}
}
while (isDecimalDigit(source.charCodeAt(index))) {
number += source[index++];
}
ch = source[index];
}
if (ch === '.') {
number += source[index++];
while (isDecimalDigit(source.charCodeAt(index))) {
number += source[index++];
}
ch = source[index];
}
if (ch === 'e' || ch === 'E') {
number += source[index++];
ch = source[index];
if (ch === '+' || ch === '-') {
number += source[index++];
}
if (isDecimalDigit(source.charCodeAt(index))) {
while (isDecimalDigit(source.charCodeAt(index))) {
number += source[index++];
}
} else {
throwUnexpectedToken();
}
}
if (isIdentifierStart(source.charCodeAt(index))) {
throwUnexpectedToken();
}
return {
type: Token.NumericLiteral,
value: parseFloat(number),
lineNumber: lineNumber,
lineStart: lineStart,
start: start,
end: index
};
}
function scanStringLiteral() {
var str = '', quote, start, ch, unescaped, octToDec, octal = false;
quote = source[index];
assert((quote === '\'' || quote === '"'),
'String literal must starts with a quote');
start = index;
++index;
while (index < length) {
ch = source[index++];
if (ch === quote) {
quote = '';
break;
} else if (ch === '\\') {
ch = source[index++];
if (!ch || !isLineTerminator(ch.charCodeAt(0))) {
switch (ch) {
case 'u':
case 'x':
if (source[index] === '{') {
++index;
str += scanUnicodeCodePointEscape();
} else {
unescaped = scanHexEscape(ch);
if (!unescaped) {
throw throwUnexpectedToken();
}
str += unescaped;
}
break;
case 'n':
str += '\n';
break;
case 'r':
str += '\r';
break;
case 't':
str += '\t';
break;
case 'b':
str += '\b';
break;
case 'f':
str += '\f';
break;
case 'v':
str += '\x0B';
break;
case '8':
case '9':
str += ch;
tolerateUnexpectedToken();
break;
default:
if (isOctalDigit(ch)) {
octToDec = octalToDecimal(ch);
octal = octToDec.octal || octal;
str += String.fromCharCode(octToDec.code);
} else {
str += ch;
}
break;
}
} else {
++lineNumber;
if (ch === '\r' && source[index] === '\n') {
++index;
}
lineStart = index;
}
} else if (isLineTerminator(ch.charCodeAt(0))) {
break;
} else {
str += ch;
}
}
if (quote !== '') {
throwUnexpectedToken();
}
return {
type: Token.StringLiteral,
value: str,
octal: octal,
lineNumber: startLineNumber,
lineStart: startLineStart,
start: start,
end: index
};
}
function scanTemplate() {
var cooked = '', ch, start, rawOffset, terminated, head, tail, restore, unescaped;
terminated = false;
tail = false;
start = index;
head = (source[index] === '`');
rawOffset = 2;
++index;
while (index < length) {
ch = source[index++];
if (ch === '`') {
rawOffset = 1;
tail = true;
terminated = true;
break;
} else if (ch === '$') {
if (source[index] === '{') {
state.curlyStack.push('${');
++index;
terminated = true;
break;
}
cooked += ch;
} else if (ch === '\\') {
ch = source[index++];
if (!isLineTerminator(ch.charCodeAt(0))) {
switch (ch) {
case 'n':
cooked += '\n';
break;
case 'r':
cooked += '\r';
break;
case 't':
cooked += '\t';
break;
case 'u':
case 'x':
if (source[index] === '{') {
++index;
cooked += scanUnicodeCodePointEscape();
} else {
restore = index;
unescaped = scanHexEscape(ch);
if (unescaped) {
cooked += unescaped;
} else {
index = restore;
cooked += ch;
}
}
break;
case 'b':
cooked += '\b';
break;
case 'f':
cooked += '\f';
break;
case 'v':
cooked += '\v';
break;
default:
if (ch === '0') {
if (isDecimalDigit(source.charCodeAt(index))) {
throwError(Messages.TemplateOctalLiteral);
}
cooked += '\0';
} else if (isOctalDigit(ch)) {
throwError(Messages.TemplateOctalLiteral);
} else {
cooked += ch;
}
break;
}
} else {
++lineNumber;
if (ch === '\r' && source[index] === '\n') {
++index;
}
lineStart = index;
}
} else if (isLineTerminator(ch.charCodeAt(0))) {
++lineNumber;
if (ch === '\r' && source[index] === '\n') {
++index;
}
lineStart = index;
cooked += '\n';
} else {
cooked += ch;
}
}
if (!terminated) {
throwUnexpectedToken();
}
if (!head) {
state.curlyStack.pop();
}
return {
type: Token.Template,
value: {
cooked: cooked,
raw: source.slice(start + 1, index - rawOffset)
},
head: head,
tail: tail,
lineNumber: lineNumber,
lineStart: lineStart,
start: start,
end: index
};
}
function testRegExp(pattern, flags) {
var astralSubstitute = '\uFFFF',
tmp = pattern;
if (flags.indexOf('u') >= 0) {
tmp = tmp
.replace(/\\u\{([0-9a-fA-F]+)\}|\\u([a-fA-F0-9]{4})/g, function ($0, $1, $2) {
var codePoint = parseInt($1 || $2, 16);
if (codePoint > 0x10FFFF) {
throwUnexpectedToken(null, Messages.InvalidRegExp);
}
if (codePoint <= 0xFFFF) {
return String.fromCharCode(codePoint);
}
return astralSubstitute;
})
.replace(
/[\uD800-\uDBFF][\uDC00-\uDFFF]/g,
astralSubstitute
);
}
try {
RegExp(tmp);
} catch (e) {
throwUnexpectedToken(null, Messages.InvalidRegExp);
}
try {
return new RegExp(pattern, flags);
} catch (exception) {
return null;
}
}
function scanRegExpBody() {
var ch, str, classMarker, terminated, body;
ch = source[index];
assert(ch === '/', 'Regular expression literal must start with a slash');
str = source[index++];
classMarker = false;
terminated = false;
while (index < length) {
ch = source[index++];
str += ch;
if (ch === '\\') {
ch = source[index++];
if (isLineTerminator(ch.charCodeAt(0))) {
throwUnexpectedToken(null, Messages.UnterminatedRegExp);
}
str += ch;
} else if (isLineTerminator(ch.charCodeAt(0))) {
throwUnexpectedToken(null, Messages.UnterminatedRegExp);
} else if (classMarker) {
if (ch === ']') {
classMarker = false;
}
} else {
if (ch === '/') {
terminated = true;
break;
} else if (ch === '[') {
classMarker = true;
}
}
}
if (!terminated) {
throwUnexpectedToken(null, Messages.UnterminatedRegExp);
}
body = str.substr(1, str.length - 2);
return {
value: body,
literal: str
};
}
function scanRegExpFlags() {
var ch, str, flags, restore;
str = '';
flags = '';
while (index < length) {
ch = source[index];
if (!isIdentifierPart(ch.charCodeAt(0))) {
break;
}
++index;
if (ch === '\\' && index < length) {
ch = source[index];
if (ch === 'u') {
++index;
restore = index;
ch = scanHexEscape('u');
if (ch) {
flags += ch;
for (str += '\\u'; restore < index; ++restore) {
str += source[restore];
}
} else {
index = restore;
flags += 'u';
str += '\\u';
}
tolerateUnexpectedToken();
} else {
str += '\\';
tolerateUnexpectedToken();
}
} else {
flags += ch;
str += ch;
}
}
return {
value: flags,
literal: str
};
}
function scanRegExp() {
var start, body, flags, value;
scanning = true;
lookahead = null;
skipComment();
start = index;
body = scanRegExpBody();
flags = scanRegExpFlags();
value = testRegExp(body.value, flags.value);
scanning = false;
if (extra.tokenize) {
return {
type: Token.RegularExpression,
value: value,
regex: {
pattern: body.value,
flags: flags.value
},
lineNumber: lineNumber,
lineStart: lineStart,
start: start,
end: index
};
}
return {
literal: body.literal + flags.literal,
value: value,
regex: {
pattern: body.value,
flags: flags.value
},
start: start,
end: index
};
}
function collectRegex() {
var pos, loc, regex, token;
skipComment();
pos = index;
loc = {
start: {
line: lineNumber,
column: index - lineStart
}
};
regex = scanRegExp();
loc.end = {
line: lineNumber,
column: index - lineStart
};
if (!extra.tokenize) {
if (extra.tokens.length > 0) {
token = extra.tokens[extra.tokens.length - 1];
if (token.range[0] === pos && token.type === 'Punctuator') {
if (token.value === '/' || token.value === '/=') {
extra.tokens.pop();
}
}
}
extra.tokens.push({
type: 'RegularExpression',
value: regex.literal,
regex: regex.regex,
range: [pos, index],
loc: loc
});
}
return regex;
}
function isIdentifierName(token) {
return token.type === Token.Identifier ||
token.type === Token.Keyword ||
token.type === Token.BooleanLiteral ||
token.type === Token.NullLiteral;
}
function advanceSlash() {
var prevToken,
checkToken;
prevToken = extra.tokens[extra.tokens.length - 1];
if (!prevToken) {
return collectRegex();
}
if (prevToken.type === 'Punctuator') {
if (prevToken.value === ']') {
return scanPunctuator();
}
if (prevToken.value === ')') {
checkToken = extra.tokens[extra.openParenToken - 1];
if (checkToken &&
checkToken.type === 'Keyword' &&
(checkToken.value === 'if' ||
checkToken.value === 'while' ||
checkToken.value === 'for' ||
checkToken.value === 'with')) {
return collectRegex();
}
return scanPunctuator();
}
if (prevToken.value === '}') {
if (extra.tokens[extra.openCurlyToken - 3] &&
extra.tokens[extra.openCurlyToken - 3].type === 'Keyword') {
checkToken = extra.tokens[extra.openCurlyToken - 4];
if (!checkToken) {
return scanPunctuator();
}
} else if (extra.tokens[extra.openCurlyToken - 4] &&
extra.tokens[extra.openCurlyToken - 4].type === 'Keyword') {
checkToken = extra.tokens[extra.openCurlyToken - 5];
if (!checkToken) {
return collectRegex();
}
} else {
return scanPunctuator();
}
if (FnExprTokens.indexOf(checkToken.value) >= 0) {
return scanPunctuator();
}
return collectRegex();
}
return collectRegex();
}
if (prevToken.type === 'Keyword' && prevToken.value !== 'this') {
return collectRegex();
}
return scanPunctuator();
}
function advance() {
var cp, token;
if (index >= length) {
return {
type: Token.EOF,
lineNumber: lineNumber,
lineStart: lineStart,
start: index,
end: index
};
}
cp = source.charCodeAt(index);
if (isIdentifierStart(cp)) {
token = scanIdentifier();
if (strict && isStrictModeReservedWord(token.value)) {
token.type = Token.Keyword;
}
return token;
}
if (cp === 0x28 || cp === 0x29 || cp === 0x3B) {
return scanPunctuator();
}
if (cp === 0x27 || cp === 0x22) {
return scanStringLiteral();
}
if (cp === 0x2E) {
if (isDecimalDigit(source.charCodeAt(index + 1))) {
return scanNumericLiteral();
}
return scanPunctuator();
}
if (isDecimalDigit(cp)) {
return scanNumericLiteral();
}
if (extra.tokenize && cp === 0x2F) {
return advanceSlash();
}
if (cp === 0x60 || (cp === 0x7D && state.curlyStack[state.curlyStack.length - 1] === '${')) {
return scanTemplate();
}
if (cp >= 0xD800 && cp < 0xDFFF) {
cp = codePointAt(index);
if (isIdentifierStart(cp)) {
return scanIdentifier();
}
}
return scanPunctuator();
}
function collectToken() {
var loc, token, value, entry;
loc = {
start: {
line: lineNumber,
column: index - lineStart
}
};
token = advance();
loc.end = {
line: lineNumber,
column: index - lineStart
};
if (token.type !== Token.EOF) {
value = source.slice(token.start, token.end);
entry = {
type: TokenName[token.type],
value: value,
range: [token.start, token.end],
loc: loc
};
if (token.regex) {
entry.regex = {
pattern: token.regex.pattern,
flags: token.regex.flags
};
}
extra.tokens.push(entry);
}
return token;
}
function lex() {
var token;
scanning = true;
lastIndex = index;
lastLineNumber = lineNumber;
lastLineStart = lineStart;
skipComment();
token = lookahead;
startIndex = index;
startLineNumber = lineNumber;
startLineStart = lineStart;
lookahead = (typeof extra.tokens !== 'undefined') ? collectToken() : advance();
scanning = false;
return token;
}
function peek() {
scanning = true;
skipComment();
lastIndex = index;
lastLineNumber = lineNumber;
lastLineStart = lineStart;
startIndex = index;
startLineNumber = lineNumber;
startLineStart = lineStart;
lookahead = (typeof extra.tokens !== 'undefined') ? collectToken() : advance();
scanning = false;
}
function Position() {
this.line = startLineNumber;
this.column = startIndex - startLineStart;
}
function SourceLocation() {
this.start = new Position();
this.end = null;
}
function WrappingSourceLocation(startToken) {
this.start = {
line: startToken.lineNumber,
column: startToken.start - startToken.lineStart
};
this.end = null;
}
function Node() {
if (extra.range) {
this.range = [startIndex, 0];
}
if (extra.loc) {
this.loc = new SourceLocation();
}
}
function WrappingNode(startToken) {
if (extra.range) {
this.range = [startToken.start, 0];
}
if (extra.loc) {
this.loc = new WrappingSourceLocation(startToken);
}
}
WrappingNode.prototype = Node.prototype = {
processComment: function () {
var lastChild,
leadingComments,
trailingComments,
bottomRight = extra.bottomRightStack,
i,
comment,
last = bottomRight[bottomRight.length - 1];
if (this.type === Syntax.Program) {
if (this.body.length > 0) {
return;
}
}
if (extra.trailingComments.length > 0) {
trailingComments = [];
for (i = extra.trailingComments.length - 1; i >= 0; --i) {
comment = extra.trailingComments[i];
if (comment.range[0] >= this.range[1]) {
trailingComments.unshift(comment);
extra.trailingComments.splice(i, 1);
}
}
extra.trailingComments = [];
} else {
if (last && last.trailingComments && last.trailingComments[0].range[0] >= this.range[1]) {
trailingComments = last.trailingComments;
delete last.trailingComments;
}
}
while (last && last.range[0] >= this.range[0]) {
lastChild = bottomRight.pop();
last = bottomRight[bottomRight.length - 1];
}
if (lastChild) {
if (lastChild.leadingComments) {
leadingComments = [];
for (i = lastChild.leadingComments.length - 1; i >= 0; --i) {
comment = lastChild.leadingComments[i];
if (comment.range[1] <= this.range[0]) {
leadingComments.unshift(comment);
lastChild.leadingComments.splice(i, 1);
}
}
if (!lastChild.leadingComments.length) {
lastChild.leadingComments = undefined;
}
}
} else if (extra.leadingComments.length > 0) {
leadingComments = [];
for (i = extra.leadingComments.length - 1; i >= 0; --i) {
comment = extra.leadingComments[i];
if (comment.range[1] <= this.range[0]) {
leadingComments.unshift(comment);
extra.leadingComments.splice(i, 1);
}
}
}
if (leadingComments && leadingComments.length > 0) {
this.leadingComments = leadingComments;
}
if (trailingComments && trailingComments.length > 0) {
this.trailingComments = trailingComments;
}
bottomRight.push(this);
},
finish: function () {
if (extra.range) {
this.range[1] = lastIndex;
}
if (extra.loc) {
this.loc.end = {
line: lastLineNumber,
column: lastIndex - lastLineStart
};
if (extra.source) {
this.loc.source = extra.source;
}
}
if (extra.attachComment) {
this.processComment();
}
},
finishArrayExpression: function (elements) {
this.type = Syntax.ArrayExpression;
this.elements = elements;
this.finish();
return this;
},
finishArrayPattern: function (elements) {
this.type = Syntax.ArrayPattern;
this.elements = elements;
this.finish();
return this;
},
finishArrowFunctionExpression: function (params, defaults, body, expression) {
this.type = Syntax.ArrowFunctionExpression;
this.id = null;
this.params = params;
this.defaults = defaults;
this.body = body;
this.generator = false;
this.expression = expression;
this.finish();
return this;
},
finishAssignmentExpression: function (operator, left, right) {
this.type = Syntax.AssignmentExpression;
this.operator = operator;
this.left = left;
this.right = right;
this.finish();
return this;
},
finishAssignmentPattern: function (left, right) {
this.type = Syntax.AssignmentPattern;
this.left = left;
this.right = right;
this.finish();
return this;
},
finishBinaryExpression: function (operator, left, right) {
this.type = (operator === '||' || operator === '&&') ? Syntax.LogicalExpression : Syntax.BinaryExpression;
this.operator = operator;
this.left = left;
this.right = right;
this.finish();
return this;
},
finishBlockStatement: function (body) {
this.type = Syntax.BlockStatement;
this.body = body;
this.finish();
return this;
},
finishBreakStatement: function (label) {
this.type = Syntax.BreakStatement;
this.label = label;
this.finish();
return this;
},
finishCallExpression: function (callee, args) {
this.type = Syntax.CallExpression;
this.callee = callee;
this.arguments = args;
this.finish();
return this;
},
finishCatchClause: function (param, body) {
this.type = Syntax.CatchClause;
this.param = param;
this.body = body;
this.finish();
return this;
},
finishClassBody: function (body) {
this.type = Syntax.ClassBody;
this.body = body;
this.finish();
return this;
},
finishClassDeclaration: function (id, superClass, body) {
this.type = Syntax.ClassDeclaration;
this.id = id;
this.superClass = superClass;
this.body = body;
this.finish();
return this;
},
finishClassExpression: function (id, superClass, body) {
this.type = Syntax.ClassExpression;
this.id = id;
this.superClass = superClass;
this.body = body;
this.finish();
return this;
},
finishConditionalExpression: function (test, consequent, alternate) {
this.type = Syntax.ConditionalExpression;
this.test = test;
this.consequent = consequent;
this.alternate = alternate;
this.finish();
return this;
},
finishContinueStatement: function (label) {
this.type = Syntax.ContinueStatement;
this.label = label;
this.finish();
return this;
},
finishDebuggerStatement: function () {
this.type = Syntax.DebuggerStatement;
this.finish();
return this;
},
finishDoWhileStatement: function (body, test) {
this.type = Syntax.DoWhileStatement;
this.body = body;
this.test = test;
this.finish();
return this;
},
finishEmptyStatement: function () {
this.type = Syntax.EmptyStatement;
this.finish();
return this;
},
finishExpressionStatement: function (expression) {
this.type = Syntax.ExpressionStatement;
this.expression = expression;
this.finish();
return this;
},
finishForStatement: function (init, test, update, body) {
this.type = Syntax.ForStatement;
this.init = init;
this.test = test;
this.update = update;
this.body = body;
this.finish();
return this;
},
finishForOfStatement: function (left, right, body) {
this.type = Syntax.ForOfStatement;
this.left = left;
this.right = right;
this.body = body;
this.finish();
return this;
},
finishForInStatement: function (left, right, body) {
this.type = Syntax.ForInStatement;
this.left = left;
this.right = right;
this.body = body;
this.each = false;
this.finish();
return this;
},
finishFunctionDeclaration: function (id, params, defaults, body, generator) {
this.type = Syntax.FunctionDeclaration;
this.id = id;
this.params = params;
this.defaults = defaults;
this.body = body;
this.generator = generator;
this.expression = false;
this.finish();
return this;
},
finishFunctionExpression: function (id, params, defaults, body, generator) {
this.type = Syntax.FunctionExpression;
this.id = id;
this.params = params;
this.defaults = defaults;
this.body = body;
this.generator = generator;
this.expression = false;
this.finish();
return this;
},
finishIdentifier: function (name) {
this.type = Syntax.Identifier;
this.name = name;
this.finish();
return this;
},
finishIfStatement: function (test, consequent, alternate) {
this.type = Syntax.IfStatement;
this.test = test;
this.consequent = consequent;
this.alternate = alternate;
this.finish();
return this;
},
finishLabeledStatement: function (label, body) {
this.type = Syntax.LabeledStatement;
this.label = label;
this.body = body;
this.finish();
return this;
},
finishLiteral: function (token) {
this.type = Syntax.Literal;
this.value = token.value;
this.raw = source.slice(token.start, token.end);
if (token.regex) {
this.regex = token.regex;
}
this.finish();
return this;
},
finishMemberExpression: function (accessor, object, property) {
this.type = Syntax.MemberExpression;
this.computed = accessor === '[';
this.object = object;
this.property = property;
this.finish();
return this;
},
finishMetaProperty: function (meta, property) {
this.type = Syntax.MetaProperty;
this.meta = meta;
this.property = property;
this.finish();
return this;
},
finishNewExpression: function (callee, args) {
this.type = Syntax.NewExpression;
this.callee = callee;
this.arguments = args;
this.finish();
return this;
},
finishObjectExpression: function (properties) {
this.type = Syntax.ObjectExpression;
this.properties = properties;
this.finish();
return this;
},
finishObjectPattern: function (properties) {
this.type = Syntax.ObjectPattern;
this.properties = properties;
this.finish();
return this;
},
finishPostfixExpression: function (operator, argument) {
this.type = Syntax.UpdateExpression;
this.operator = operator;
this.argument = argument;
this.prefix = false;
this.finish();
return this;
},
finishProgram: function (body, sourceType) {
this.type = Syntax.Program;
this.body = body;
this.sourceType = sourceType;
this.finish();
return this;
},
finishProperty: function (kind, key, computed, value, method, shorthand) {
this.type = Syntax.Property;
this.key = key;
this.computed = computed;
this.value = value;
this.kind = kind;
this.method = method;
this.shorthand = shorthand;
this.finish();
return this;
},
finishRestElement: function (argument) {
this.type = Syntax.RestElement;
this.argument = argument;
this.finish();
return this;
},
finishReturnStatement: function (argument) {
this.type = Syntax.ReturnStatement;
this.argument = argument;
this.finish();
return this;
},
finishSequenceExpression: function (expressions) {
this.type = Syntax.SequenceExpression;
this.expressions = expressions;
this.finish();
return this;
},
finishSpreadElement: function (argument) {
this.type = Syntax.SpreadElement;
this.argument = argument;
this.finish();
return this;
},
finishSwitchCase: function (test, consequent) {
this.type = Syntax.SwitchCase;
this.test = test;
this.consequent = consequent;
this.finish();
return this;
},
finishSuper: function () {
this.type = Syntax.Super;
this.finish();
return this;
},
finishSwitchStatement: function (discriminant, cases) {
this.type = Syntax.SwitchStatement;
this.discriminant = discriminant;
this.cases = cases;
this.finish();
return this;
},
finishTaggedTemplateExpression: function (tag, quasi) {
this.type = Syntax.TaggedTemplateExpression;
this.tag = tag;
this.quasi = quasi;
this.finish();
return this;
},
finishTemplateElement: function (value, tail) {
this.type = Syntax.TemplateElement;
this.value = value;
this.tail = tail;
this.finish();
return this;
},
finishTemplateLiteral: function (quasis, expressions) {
this.type = Syntax.TemplateLiteral;
this.quasis = quasis;
this.expressions = expressions;
this.finish();
return this;
},
finishThisExpression: function () {
this.type = Syntax.ThisExpression;
this.finish();
return this;
},
finishThrowStatement: function (argument) {
this.type = Syntax.ThrowStatement;
this.argument = argument;
this.finish();
return this;
},
finishTryStatement: function (block, handler, finalizer) {
this.type = Syntax.TryStatement;
this.block = block;
this.guardedHandlers = [];
this.handlers = handler ? [handler] : [];
this.handler = handler;
this.finalizer = finalizer;
this.finish();
return this;
},
finishUnaryExpression: function (operator, argument) {
this.type = (operator === '++' || operator === '--') ? Syntax.UpdateExpression : Syntax.UnaryExpression;
this.operator = operator;
this.argument = argument;
this.prefix = true;
this.finish();
return this;
},
finishVariableDeclaration: function (declarations) {
this.type = Syntax.VariableDeclaration;
this.declarations = declarations;
this.kind = 'var';
this.finish();
return this;
},
finishLexicalDeclaration: function (declarations, kind) {
this.type = Syntax.VariableDeclaration;
this.declarations = declarations;
this.kind = kind;
this.finish();
return this;
},
finishVariableDeclarator: function (id, init) {
this.type = Syntax.VariableDeclarator;
this.id = id;
this.init = init;
this.finish();
return this;
},
finishWhileStatement: function (test, body) {
this.type = Syntax.WhileStatement;
this.test = test;
this.body = body;
this.finish();
return this;
},
finishWithStatement: function (object, body) {
this.type = Syntax.WithStatement;
this.object = object;
this.body = body;
this.finish();
return this;
},
finishExportSpecifier: function (local, exported) {
this.type = Syntax.ExportSpecifier;
this.exported = exported || local;
this.local = local;
this.finish();
return this;
},
finishImportDefaultSpecifier: function (local) {
this.type = Syntax.ImportDefaultSpecifier;
this.local = local;
this.finish();
return this;
},
finishImportNamespaceSpecifier: function (local) {
this.type = Syntax.ImportNamespaceSpecifier;
this.local = local;
this.finish();
return this;
},
finishExportNamedDeclaration: function (declaration, specifiers, src) {
this.type = Syntax.ExportNamedDeclaration;
this.declaration = declaration;
this.specifiers = specifiers;
this.source = src;
this.finish();
return this;
},
finishExportDefaultDeclaration: function (declaration) {
this.type = Syntax.ExportDefaultDeclaration;
this.declaration = declaration;
this.finish();
return this;
},
finishExportAllDeclaration: function (src) {
this.type = Syntax.ExportAllDeclaration;
this.source = src;
this.finish();
return this;
},
finishImportSpecifier: function (local, imported) {
this.type = Syntax.ImportSpecifier;
this.local = local || imported;
this.imported = imported;
this.finish();
return this;
},
finishImportDeclaration: function (specifiers, src) {
this.type = Syntax.ImportDeclaration;
this.specifiers = specifiers;
this.source = src;
this.finish();
return this;
},
finishYieldExpression: function (argument, delegate) {
this.type = Syntax.YieldExpression;
this.argument = argument;
this.delegate = delegate;
this.finish();
return this;
}
};
function recordError(error) {
var e, existing;
for (e = 0; e < extra.errors.length; e++) {
existing = extra.errors[e];
if (existing.index === error.index && existing.message === error.message) {
return;
}
}
extra.errors.push(error);
}
function constructError(msg, column) {
var error = new Error(msg);
try {
throw error;
} catch (base) {
if (Object.create && Object.defineProperty) {
error = Object.create(base);
Object.defineProperty(error, 'column', { value: column });
}
} finally {
return error;
}
}
function createError(line, pos, description) {
var msg, column, error;
msg = 'Line ' + line + ': ' + description;
column = pos - (scanning ? lineStart : lastLineStart) + 1;
error = constructError(msg, column);
error.lineNumber = line;
error.description = description;
error.index = pos;
return error;
}
function throwError(messageFormat) {
var args, msg;
args = Array.prototype.slice.call(arguments, 1);
msg = messageFormat.replace(/%(\d)/g,
function (whole, idx) {
assert(idx < args.length, 'Message reference must be in range');
return args[idx];
}
);
throw createError(lastLineNumber, lastIndex, msg);
}
function tolerateError(messageFormat) {
var args, msg, error;
args = Array.prototype.slice.call(arguments, 1);
msg = messageFormat.replace(/%(\d)/g,
function (whole, idx) {
assert(idx < args.length, 'Message reference must be in range');
return args[idx];
}
);
error = createError(lineNumber, lastIndex, msg);
if (extra.errors) {
recordError(error);
} else {
throw error;
}
}
function unexpectedTokenError(token, message) {
var value, msg = message || Messages.UnexpectedToken;
if (token) {
if (!message) {
msg = (token.type === Token.EOF) ? Messages.UnexpectedEOS :
(token.type === Token.Identifier) ? Messages.UnexpectedIdentifier :
(token.type === Token.NumericLiteral) ? Messages.UnexpectedNumber :
(token.type === Token.StringLiteral) ? Messages.UnexpectedString :
(token.type === Token.Template) ? Messages.UnexpectedTemplate :
Messages.UnexpectedToken;
if (token.type === Token.Keyword) {
if (isFutureReservedWord(token.value)) {
msg = Messages.UnexpectedReserved;
} else if (strict && isStrictModeReservedWord(token.value)) {
msg = Messages.StrictReservedWord;
}
}
}
value = (token.type === Token.Template) ? token.value.raw : token.value;
} else {
value = 'ILLEGAL';
}
msg = msg.replace('%0', value);
return (token && typeof token.lineNumber === 'number') ?
createError(token.lineNumber, token.start, msg) :
createError(scanning ? lineNumber : lastLineNumber, scanning ? index : lastIndex, msg);
}
function throwUnexpectedToken(token, message) {
throw unexpectedTokenError(token, message);
}
function tolerateUnexpectedToken(token, message) {
var error = unexpectedTokenError(token, message);
if (extra.errors) {
recordError(error);
} else {
throw error;
}
}
function expect(value) {
var token = lex();
if (token.type !== Token.Punctuator || token.value !== value) {
throwUnexpectedToken(token);
}
}
function expectCommaSeparator() {
var token;
if (extra.errors) {
token = lookahead;
if (token.type === Token.Punctuator && token.value === ',') {
lex();
} else if (token.type === Token.Punctuator && token.value === ';') {
lex();
tolerateUnexpectedToken(token);
} else {
tolerateUnexpectedToken(token, Messages.UnexpectedToken);
}
} else {
expect(',');
}
}
function expectKeyword(keyword) {
var token = lex();
if (token.type !== Token.Keyword || token.value !== keyword) {
throwUnexpectedToken(token);
}
}
function match(value) {
return lookahead.type === Token.Punctuator && lookahead.value === value;
}
function matchKeyword(keyword) {
return lookahead.type === Token.Keyword && lookahead.value === keyword;
}
function matchContextualKeyword(keyword) {
return lookahead.type === Token.Identifier && lookahead.value === keyword;
}
function matchAssign() {
var op;
if (lookahead.type !== Token.Punctuator) {
return false;
}
op = lookahead.value;
return op === '=' ||
op === '*=' ||
op === '/=' ||
op === '%=' ||
op === '+=' ||
op === '-=' ||
op === '<<=' ||
op === '>>=' ||
op === '>>>=' ||
op === '&=' ||
op === '^=' ||
op === '|=';
}
function consumeSemicolon() {
if (source.charCodeAt(startIndex) === 0x3B || match(';')) {
lex();
return;
}
if (hasLineTerminator) {
return;
}
lastIndex = startIndex;
lastLineNumber = startLineNumber;
lastLineStart = startLineStart;
if (lookahead.type !== Token.EOF && !match('}')) {
throwUnexpectedToken(lookahead);
}
}
function isolateCoverGrammar(parser) {
var oldIsBindingElement = isBindingElement,
oldIsAssignmentTarget = isAssignmentTarget,
oldFirstCoverInitializedNameError = firstCoverInitializedNameError,
result;
isBindingElement = true;
isAssignmentTarget = true;
firstCoverInitializedNameError = null;
result = parser();
if (firstCoverInitializedNameError !== null) {
throwUnexpectedToken(firstCoverInitializedNameError);
}
isBindingElement = oldIsBindingElement;
isAssignmentTarget = oldIsAssignmentTarget;
firstCoverInitializedNameError = oldFirstCoverInitializedNameError;
return result;
}
function inheritCoverGrammar(parser) {
var oldIsBindingElement = isBindingElement,
oldIsAssignmentTarget = isAssignmentTarget,
oldFirstCoverInitializedNameError = firstCoverInitializedNameError,
result;
isBindingElement = true;
isAssignmentTarget = true;
firstCoverInitializedNameError = null;
result = parser();
isBindingElement = isBindingElement && oldIsBindingElement;
isAssignmentTarget = isAssignmentTarget && oldIsAssignmentTarget;
firstCoverInitializedNameError = oldFirstCoverInitializedNameError || firstCoverInitializedNameError;
return result;
}
function parseArrayPattern(params, kind) {
var node = new Node(), elements = [], rest, restNode;
expect('[');
while (!match(']')) {
if (match(',')) {
lex();
elements.push(null);
} else {
if (match('...')) {
restNode = new Node();
lex();
params.push(lookahead);
rest = parseVariableIdentifier(kind);
elements.push(restNode.finishRestElement(rest));
break;
} else {
elements.push(parsePatternWithDefault(params, kind));
}
if (!match(']')) {
expect(',');
}
}
}
expect(']');
return node.finishArrayPattern(elements);
}
function parsePropertyPattern(params, kind) {
var node = new Node(), key, keyToken, computed = match('['), init;
if (lookahead.type === Token.Identifier) {
keyToken = lookahead;
key = parseVariableIdentifier();
if (match('=')) {
params.push(keyToken);
lex();
init = parseAssignmentExpression();
return node.finishProperty(
'init', key, false,
new WrappingNode(keyToken).finishAssignmentPattern(key, init), false, false);
} else if (!match(':')) {
params.push(keyToken);
return node.finishProperty('init', key, false, key, false, true);
}
} else {
key = parseObjectPropertyKey();
}
expect(':');
init = parsePatternWithDefault(params, kind);
return node.finishProperty('init', key, computed, init, false, false);
}
function parseObjectPattern(params, kind) {
var node = new Node(), properties = [];
expect('{');
while (!match('}')) {
properties.push(parsePropertyPattern(params, kind));
if (!match('}')) {
expect(',');
}
}
lex();
return node.finishObjectPattern(properties);
}
function parsePattern(params, kind) {
if (match('[')) {
return parseArrayPattern(params, kind);
} else if (match('{')) {
return parseObjectPattern(params, kind);
} else if (matchKeyword('let')) {
if (kind === 'const' || kind === 'let') {
tolerateUnexpectedToken(lookahead, Messages.UnexpectedToken);
}
}
params.push(lookahead);
return parseVariableIdentifier(kind);
}
function parsePatternWithDefault(params, kind) {
var startToken = lookahead, pattern, previousAllowYield, right;
pattern = parsePattern(params, kind);
if (match('=')) {
lex();
previousAllowYield = state.allowYield;
state.allowYield = true;
right = isolateCoverGrammar(parseAssignmentExpression);
state.allowYield = previousAllowYield;
pattern = new WrappingNode(startToken).finishAssignmentPattern(pattern, right);
}
return pattern;
}
function parseArrayInitializer() {
var elements = [], node = new Node(), restSpread;
expect('[');
while (!match(']')) {
if (match(',')) {
lex();
elements.push(null);
} else if (match('...')) {
restSpread = new Node();
lex();
restSpread.finishSpreadElement(inheritCoverGrammar(parseAssignmentExpression));
if (!match(']')) {
isAssignmentTarget = isBindingElement = false;
expect(',');
}
elements.push(restSpread);
} else {
elements.push(inheritCoverGrammar(parseAssignmentExpression));
if (!match(']')) {
expect(',');
}
}
}
lex();
return node.finishArrayExpression(elements);
}
function parsePropertyFunction(node, paramInfo, isGenerator) {
var previousStrict, body;
isAssignmentTarget = isBindingElement = false;
previousStrict = strict;
body = isolateCoverGrammar(parseFunctionSourceElements);
if (strict && paramInfo.firstRestricted) {
tolerateUnexpectedToken(paramInfo.firstRestricted, paramInfo.message);
}
if (strict && paramInfo.stricted) {
tolerateUnexpectedToken(paramInfo.stricted, paramInfo.message);
}
strict = previousStrict;
return node.finishFunctionExpression(null, paramInfo.params, paramInfo.defaults, body, isGenerator);
}
function parsePropertyMethodFunction() {
var params, method, node = new Node(),
previousAllowYield = state.allowYield;
state.allowYield = false;
params = parseParams();
state.allowYield = previousAllowYield;
state.allowYield = false;
method = parsePropertyFunction(node, params, false);
state.allowYield = previousAllowYield;
return method;
}
function parseObjectPropertyKey() {
var token, node = new Node(), expr;
token = lex();
switch (token.type) {
case Token.StringLiteral:
case Token.NumericLiteral:
if (strict && token.octal) {
tolerateUnexpectedToken(token, Messages.StrictOctalLiteral);
}
return node.finishLiteral(token);
case Token.Identifier:
case Token.BooleanLiteral:
case Token.NullLiteral:
case Token.Keyword:
return node.finishIdentifier(token.value);
case Token.Punctuator:
if (token.value === '[') {
expr = isolateCoverGrammar(parseAssignmentExpression);
expect(']');
return expr;
}
break;
}
throwUnexpectedToken(token);
}
function lookaheadPropertyName() {
switch (lookahead.type) {
case Token.Identifier:
case Token.StringLiteral:
case Token.BooleanLiteral:
case Token.NullLiteral:
case Token.NumericLiteral:
case Token.Keyword:
return true;
case Token.Punctuator:
return lookahead.value === '[';
}
return false;
}
function tryParseMethodDefinition(token, key, computed, node) {
var value, options, methodNode, params,
previousAllowYield = state.allowYield;
if (token.type === Token.Identifier) {
if (token.value === 'get' && lookaheadPropertyName()) {
computed = match('[');
key = parseObjectPropertyKey();
methodNode = new Node();
expect('(');
expect(')');
state.allowYield = false;
value = parsePropertyFunction(methodNode, {
params: [],
defaults: [],
stricted: null,
firstRestricted: null,
message: null
}, false);
state.allowYield = previousAllowYield;
return node.finishProperty('get', key, computed, value, false, false);
} else if (token.value === 'set' && lookaheadPropertyName()) {
computed = match('[');
key = parseObjectPropertyKey();
methodNode = new Node();
expect('(');
options = {
params: [],
defaultCount: 0,
defaults: [],
firstRestricted: null,
paramSet: {}
};
if (match(')')) {
tolerateUnexpectedToken(lookahead);
} else {
state.allowYield = false;
parseParam(options);
state.allowYield = previousAllowYield;
if (options.defaultCount === 0) {
options.defaults = [];
}
}
expect(')');
state.allowYield = false;
value = parsePropertyFunction(methodNode, options, false);
state.allowYield = previousAllowYield;
return node.finishProperty('set', key, computed, value, false, false);
}
} else if (token.type === Token.Punctuator && token.value === '*' && lookaheadPropertyName()) {
computed = match('[');
key = parseObjectPropertyKey();
methodNode = new Node();
state.allowYield = true;
params = parseParams();
state.allowYield = previousAllowYield;
state.allowYield = false;
value = parsePropertyFunction(methodNode, params, true);
state.allowYield = previousAllowYield;
return node.finishProperty('init', key, computed, value, true, false);
}
if (key && match('(')) {
value = parsePropertyMethodFunction();
return node.finishProperty('init', key, computed, value, true, false);
}
return null;
}
function parseObjectProperty(hasProto) {
var token = lookahead, node = new Node(), computed, key, maybeMethod, proto, value;
computed = match('[');
if (match('*')) {
lex();
} else {
key = parseObjectPropertyKey();
}
maybeMethod = tryParseMethodDefinition(token, key, computed, node);
if (maybeMethod) {
return maybeMethod;
}
if (!key) {
throwUnexpectedToken(lookahead);
}
if (!computed) {
proto = (key.type === Syntax.Identifier && key.name === '__proto__') ||
(key.type === Syntax.Literal && key.value === '__proto__');
if (hasProto.value && proto) {
tolerateError(Messages.DuplicateProtoProperty);
}
hasProto.value |= proto;
}
if (match(':')) {
lex();
value = inheritCoverGrammar(parseAssignmentExpression);
return node.finishProperty('init', key, computed, value, false, false);
}
if (token.type === Token.Identifier) {
if (match('=')) {
firstCoverInitializedNameError = lookahead;
lex();
value = isolateCoverGrammar(parseAssignmentExpression);
return node.finishProperty('init', key, computed,
new WrappingNode(token).finishAssignmentPattern(key, value), false, true);
}
return node.finishProperty('init', key, computed, key, false, true);
}
throwUnexpectedToken(lookahead);
}
function parseObjectInitializer() {
var properties = [], hasProto = {value: false}, node = new Node();
expect('{');
while (!match('}')) {
properties.push(parseObjectProperty(hasProto));
if (!match('}')) {
expectCommaSeparator();
}
}
expect('}');
return node.finishObjectExpression(properties);
}
function reinterpretExpressionAsPattern(expr) {
var i;
switch (expr.type) {
case Syntax.Identifier:
case Syntax.MemberExpression:
case Syntax.RestElement:
case Syntax.AssignmentPattern:
break;
case Syntax.SpreadElement:
expr.type = Syntax.RestElement;
reinterpretExpressionAsPattern(expr.argument);
break;
case Syntax.ArrayExpression:
expr.type = Syntax.ArrayPattern;
for (i = 0; i < expr.elements.length; i++) {
if (expr.elements[i] !== null) {
reinterpretExpressionAsPattern(expr.elements[i]);
}
}
break;
case Syntax.ObjectExpression:
expr.type = Syntax.ObjectPattern;
for (i = 0; i < expr.properties.length; i++) {
reinterpretExpressionAsPattern(expr.properties[i].value);
}
break;
case Syntax.AssignmentExpression:
expr.type = Syntax.AssignmentPattern;
reinterpretExpressionAsPattern(expr.left);
break;
default:
break;
}
}
function parseTemplateElement(option) {
var node, token;
if (lookahead.type !== Token.Template || (option.head && !lookahead.head)) {
throwUnexpectedToken();
}
node = new Node();
token = lex();
return node.finishTemplateElement({ raw: token.value.raw, cooked: token.value.cooked }, token.tail);
}
function parseTemplateLiteral() {
var quasi, quasis, expressions, node = new Node();
quasi = parseTemplateElement({ head: true });
quasis = [quasi];
expressions = [];
while (!quasi.tail) {
expressions.push(parseExpression());
quasi = parseTemplateElement({ head: false });
quasis.push(quasi);
}
return node.finishTemplateLiteral(quasis, expressions);
}
function parseGroupExpression() {
var expr, expressions, startToken, i, params = [];
expect('(');
if (match(')')) {
lex();
if (!match('=>')) {
expect('=>');
}
return {
type: PlaceHolders.ArrowParameterPlaceHolder,
params: [],
rawParams: []
};
}
startToken = lookahead;
if (match('...')) {
expr = parseRestElement(params);
expect(')');
if (!match('=>')) {
expect('=>');
}
return {
type: PlaceHolders.ArrowParameterPlaceHolder,
params: [expr]
};
}
isBindingElement = true;
expr = inheritCoverGrammar(parseAssignmentExpression);
if (match(',')) {
isAssignmentTarget = false;
expressions = [expr];
while (startIndex < length) {
if (!match(',')) {
break;
}
lex();
if (match('...')) {
if (!isBindingElement) {
throwUnexpectedToken(lookahead);
}
expressions.push(parseRestElement(params));
expect(')');
if (!match('=>')) {
expect('=>');
}
isBindingElement = false;
for (i = 0; i < expressions.length; i++) {
reinterpretExpressionAsPattern(expressions[i]);
}
return {
type: PlaceHolders.ArrowParameterPlaceHolder,
params: expressions
};
}
expressions.push(inheritCoverGrammar(parseAssignmentExpression));
}
expr = new WrappingNode(startToken).finishSequenceExpression(expressions);
}
expect(')');
if (match('=>')) {
if (expr.type === Syntax.Identifier && expr.name === 'yield') {
return {
type: PlaceHolders.ArrowParameterPlaceHolder,
params: [expr]
};
}
if (!isBindingElement) {
throwUnexpectedToken(lookahead);
}
if (expr.type === Syntax.SequenceExpression) {
for (i = 0; i < expr.expressions.length; i++) {
reinterpretExpressionAsPattern(expr.expressions[i]);
}
} else {
reinterpretExpressionAsPattern(expr);
}
expr = {
type: PlaceHolders.ArrowParameterPlaceHolder,
params: expr.type === Syntax.SequenceExpression ? expr.expressions : [expr]
};
}
isBindingElement = false;
return expr;
}
function parsePrimaryExpression() {
var type, token, expr, node;
if (match('(')) {
isBindingElement = false;
return inheritCoverGrammar(parseGroupExpression);
}
if (match('[')) {
return inheritCoverGrammar(parseArrayInitializer);
}
if (match('{')) {
return inheritCoverGrammar(parseObjectInitializer);
}
type = lookahead.type;
node = new Node();
if (type === Token.Identifier) {
if (state.sourceType === 'module' && lookahead.value === 'await') {
tolerateUnexpectedToken(lookahead);
}
expr = node.finishIdentifier(lex().value);
} else if (type === Token.StringLiteral || type === Token.NumericLiteral) {
isAssignmentTarget = isBindingElement = false;
if (strict && lookahead.octal) {
tolerateUnexpectedToken(lookahead, Messages.StrictOctalLiteral);
}
expr = node.finishLiteral(lex());
} else if (type === Token.Keyword) {
if (!strict && state.allowYield && matchKeyword('yield')) {
return parseNonComputedProperty();
}
isAssignmentTarget = isBindingElement = false;
if (matchKeyword('function')) {
return parseFunctionExpression();
}
if (matchKeyword('this')) {
lex();
return node.finishThisExpression();
}
if (matchKeyword('class')) {
return parseClassExpression();
}
if (!strict && matchKeyword('let')) {
return node.finishIdentifier(lex().value);
}
throwUnexpectedToken(lex());
} else if (type === Token.BooleanLiteral) {
isAssignmentTarget = isBindingElement = false;
token = lex();
token.value = (token.value === 'true');
expr = node.finishLiteral(token);
} else if (type === Token.NullLiteral) {
isAssignmentTarget = isBindingElement = false;
token = lex();
token.value = null;
expr = node.finishLiteral(token);
} else if (match('/') || match('/=')) {
isAssignmentTarget = isBindingElement = false;
index = startIndex;
if (typeof extra.tokens !== 'undefined') {
token = collectRegex();
} else {
token = scanRegExp();
}
lex();
expr = node.finishLiteral(token);
} else if (type === Token.Template) {
expr = parseTemplateLiteral();
} else {
throwUnexpectedToken(lex());
}
return expr;
}
function parseArguments() {
var args = [], expr;
expect('(');
if (!match(')')) {
while (startIndex < length) {
if (match('...')) {
expr = new Node();
lex();
expr.finishSpreadElement(isolateCoverGrammar(parseAssignmentExpression));
} else {
expr = isolateCoverGrammar(parseAssignmentExpression);
}
args.push(expr);
if (match(')')) {
break;
}
expectCommaSeparator();
}
}
expect(')');
return args;
}
function parseNonComputedProperty() {
var token, node = new Node();
token = lex();
if (!isIdentifierName(token)) {
throwUnexpectedToken(token);
}
return node.finishIdentifier(token.value);
}
function parseNonComputedMember() {
expect('.');
return parseNonComputedProperty();
}
function parseComputedMember() {
var expr;
expect('[');
expr = isolateCoverGrammar(parseExpression);
expect(']');
return expr;
}
function parseNewExpression() {
var callee, args, node = new Node();
expectKeyword('new');
if (match('.')) {
lex();
if (lookahead.type === Token.Identifier && lookahead.value === 'target') {
if (state.inFunctionBody) {
lex();
return node.finishMetaProperty('new', 'target');
}
}
throwUnexpectedToken(lookahead);
}
callee = isolateCoverGrammar(parseLeftHandSideExpression);
args = match('(') ? parseArguments() : [];
isAssignmentTarget = isBindingElement = false;
return node.finishNewExpression(callee, args);
}
function parseLeftHandSideExpressionAllowCall() {
var quasi, expr, args, property, startToken, previousAllowIn = state.allowIn;
startToken = lookahead;
state.allowIn = true;
if (matchKeyword('super') && state.inFunctionBody) {
expr = new Node();
lex();
expr = expr.finishSuper();
if (!match('(') && !match('.') && !match('[')) {
throwUnexpectedToken(lookahead);
}
} else {
expr = inheritCoverGrammar(matchKeyword('new') ? parseNewExpression : parsePrimaryExpression);
}
for (;;) {
if (match('.')) {
isBindingElement = false;
isAssignmentTarget = true;
property = parseNonComputedMember();
expr = new WrappingNode(startToken).finishMemberExpression('.', expr, property);
} else if (match('(')) {
isBindingElement = false;
isAssignmentTarget = false;
args = parseArguments();
expr = new WrappingNode(startToken).finishCallExpression(expr, args);
} else if (match('[')) {
isBindingElement = false;
isAssignmentTarget = true;
property = parseComputedMember();
expr = new WrappingNode(startToken).finishMemberExpression('[', expr, property);
} else if (lookahead.type === Token.Template && lookahead.head) {
quasi = parseTemplateLiteral();
expr = new WrappingNode(startToken).finishTaggedTemplateExpression(expr, quasi);
} else {
break;
}
}
state.allowIn = previousAllowIn;
return expr;
}
function parseLeftHandSideExpression() {
var quasi, expr, property, startToken;
assert(state.allowIn, 'callee of new expression always allow in keyword.');
startToken = lookahead;
if (matchKeyword('super') && state.inFunctionBody) {
expr = new Node();
lex();
expr = expr.finishSuper();
if (!match('[') && !match('.')) {
throwUnexpectedToken(lookahead);
}
} else {
expr = inheritCoverGrammar(matchKeyword('new') ? parseNewExpression : parsePrimaryExpression);
}
for (;;) {
if (match('[')) {
isBindingElement = false;
isAssignmentTarget = true;
property = parseComputedMember();
expr = new WrappingNode(startToken).finishMemberExpression('[', expr, property);
} else if (match('.')) {
isBindingElement = false;
isAssignmentTarget = true;
property = parseNonComputedMember();
expr = new WrappingNode(startToken).finishMemberExpression('.', expr, property);
} else if (lookahead.type === Token.Template && lookahead.head) {
quasi = parseTemplateLiteral();
expr = new WrappingNode(startToken).finishTaggedTemplateExpression(expr, quasi);
} else {
break;
}
}
return expr;
}
function parsePostfixExpression() {
var expr, token, startToken = lookahead;
expr = inheritCoverGrammar(parseLeftHandSideExpressionAllowCall);
if (!hasLineTerminator && lookahead.type === Token.Punctuator) {
if (match('++') || match('--')) {
if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) {
tolerateError(Messages.StrictLHSPostfix);
}
if (!isAssignmentTarget) {
tolerateError(Messages.InvalidLHSInAssignment);
}
isAssignmentTarget = isBindingElement = false;
token = lex();
expr = new WrappingNode(startToken).finishPostfixExpression(token.value, expr);
}
}
return expr;
}
function parseUnaryExpression() {
var token, expr, startToken;
if (lookahead.type !== Token.Punctuator && lookahead.type !== Token.Keyword) {
expr = parsePostfixExpression();
} else if (match('++') || match('--')) {
startToken = lookahead;
token = lex();
expr = inheritCoverGrammar(parseUnaryExpression);
if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) {
tolerateError(Messages.StrictLHSPrefix);
}
if (!isAssignmentTarget) {
tolerateError(Messages.InvalidLHSInAssignment);
}
expr = new WrappingNode(startToken).finishUnaryExpression(token.value, expr);
isAssignmentTarget = isBindingElement = false;
} else if (match('+') || match('-') || match('~') || match('!')) {
startToken = lookahead;
token = lex();
expr = inheritCoverGrammar(parseUnaryExpression);
expr = new WrappingNode(startToken).finishUnaryExpression(token.value, expr);
isAssignmentTarget = isBindingElement = false;
} else if (matchKeyword('delete') || matchKeyword('void') || matchKeyword('typeof')) {
startToken = lookahead;
token = lex();
expr = inheritCoverGrammar(parseUnaryExpression);
expr = new WrappingNode(startToken).finishUnaryExpression(token.value, expr);
if (strict && expr.operator === 'delete' && expr.argument.type === Syntax.Identifier) {
tolerateError(Messages.StrictDelete);
}
isAssignmentTarget = isBindingElement = false;
} else {
expr = parsePostfixExpression();
}
return expr;
}
function binaryPrecedence(token, allowIn) {
var prec = 0;
if (token.type !== Token.Punctuator && token.type !== Token.Keyword) {
return 0;
}
switch (token.value) {
case '||':
prec = 1;
break;
case '&&':
prec = 2;
break;
case '|':
prec = 3;
break;
case '^':
prec = 4;
break;
case '&':
prec = 5;
break;
case '==':
case '!=':
case '===':
case '!==':
prec = 6;
break;
case '<':
case '>':
case '<=':
case '>=':
case 'instanceof':
prec = 7;
break;
case 'in':
prec = allowIn ? 7 : 0;
break;
case '<<':
case '>>':
case '>>>':
prec = 8;
break;
case '+':
case '-':
prec = 9;
break;
case '*':
case '/':
case '%':
prec = 11;
break;
default:
break;
}
return prec;
}
function parseBinaryExpression() {
var marker, markers, expr, token, prec, stack, right, operator, left, i;
marker = lookahead;
left = inheritCoverGrammar(parseUnaryExpression);
token = lookahead;
prec = binaryPrecedence(token, state.allowIn);
if (prec === 0) {
return left;
}
isAssignmentTarget = isBindingElement = false;
token.prec = prec;
lex();
markers = [marker, lookahead];
right = isolateCoverGrammar(parseUnaryExpression);
stack = [left, token, right];
while ((prec = binaryPrecedence(lookahead, state.allowIn)) > 0) {
while ((stack.length > 2) && (prec <= stack[stack.length - 2].prec)) {
right = stack.pop();
operator = stack.pop().value;
left = stack.pop();
markers.pop();
expr = new WrappingNode(markers[markers.length - 1]).finishBinaryExpression(operator, left, right);
stack.push(expr);
}
token = lex();
token.prec = prec;
stack.push(token);
markers.push(lookahead);
expr = isolateCoverGrammar(parseUnaryExpression);
stack.push(expr);
}
i = stack.length - 1;
expr = stack[i];
markers.pop();
while (i > 1) {
expr = new WrappingNode(markers.pop()).finishBinaryExpression(stack[i - 1].value, stack[i - 2], expr);
i -= 2;
}
return expr;
}
function parseConditionalExpression() {
var expr, previousAllowIn, consequent, alternate, startToken;
startToken = lookahead;
expr = inheritCoverGrammar(parseBinaryExpression);
if (match('?')) {
lex();
previousAllowIn = state.allowIn;
state.allowIn = true;
consequent = isolateCoverGrammar(parseAssignmentExpression);
state.allowIn = previousAllowIn;
expect(':');
alternate = isolateCoverGrammar(parseAssignmentExpression);
expr = new WrappingNode(startToken).finishConditionalExpression(expr, consequent, alternate);
isAssignmentTarget = isBindingElement = false;
}
return expr;
}
function parseConciseBody() {
if (match('{')) {
return parseFunctionSourceElements();
}
return isolateCoverGrammar(parseAssignmentExpression);
}
function checkPatternParam(options, param) {
var i;
switch (param.type) {
case Syntax.Identifier:
validateParam(options, param, param.name);
break;
case Syntax.RestElement:
checkPatternParam(options, param.argument);
break;
case Syntax.AssignmentPattern:
checkPatternParam(options, param.left);
break;
case Syntax.ArrayPattern:
for (i = 0; i < param.elements.length; i++) {
if (param.elements[i] !== null) {
checkPatternParam(options, param.elements[i]);
}
}
break;
case Syntax.YieldExpression:
break;
default:
assert(param.type === Syntax.ObjectPattern, 'Invalid type');
for (i = 0; i < param.properties.length; i++) {
checkPatternParam(options, param.properties[i].value);
}
break;
}
}
function reinterpretAsCoverFormalsList(expr) {
var i, len, param, params, defaults, defaultCount, options, token;
defaults = [];
defaultCount = 0;
params = [expr];
switch (expr.type) {
case Syntax.Identifier:
break;
case PlaceHolders.ArrowParameterPlaceHolder:
params = expr.params;
break;
default:
return null;
}
options = {
paramSet: {}
};
for (i = 0, len = params.length; i < len; i += 1) {
param = params[i];
switch (param.type) {
case Syntax.AssignmentPattern:
params[i] = param.left;
if (param.right.type === Syntax.YieldExpression) {
if (param.right.argument) {
throwUnexpectedToken(lookahead);
}
param.right.type = Syntax.Identifier;
param.right.name = 'yield';
delete param.right.argument;
delete param.right.delegate;
}
defaults.push(param.right);
++defaultCount;
checkPatternParam(options, param.left);
break;
default:
checkPatternParam(options, param);
params[i] = param;
defaults.push(null);
break;
}
}
if (strict || !state.allowYield) {
for (i = 0, len = params.length; i < len; i += 1) {
param = params[i];
if (param.type === Syntax.YieldExpression) {
throwUnexpectedToken(lookahead);
}
}
}
if (options.message === Messages.StrictParamDupe) {
token = strict ? options.stricted : options.firstRestricted;
throwUnexpectedToken(token, options.message);
}
if (defaultCount === 0) {
defaults = [];
}
return {
params: params,
defaults: defaults,
stricted: options.stricted,
firstRestricted: options.firstRestricted,
message: options.message
};
}
function parseArrowFunctionExpression(options, node) {
var previousStrict, previousAllowYield, body;
if (hasLineTerminator) {
tolerateUnexpectedToken(lookahead);
}
expect('=>');
previousStrict = strict;
previousAllowYield = state.allowYield;
state.allowYield = true;
body = parseConciseBody();
if (strict && options.firstRestricted) {
throwUnexpectedToken(options.firstRestricted, options.message);
}
if (strict && options.stricted) {
tolerateUnexpectedToken(options.stricted, options.message);
}
strict = previousStrict;
state.allowYield = previousAllowYield;
return node.finishArrowFunctionExpression(options.params, options.defaults, body, body.type !== Syntax.BlockStatement);
}
function parseYieldExpression() {
var argument, expr, delegate, previousAllowYield;
argument = null;
expr = new Node();
expectKeyword('yield');
if (!hasLineTerminator) {
previousAllowYield = state.allowYield;
state.allowYield = false;
delegate = match('*');
if (delegate) {
lex();
argument = parseAssignmentExpression();
} else {
if (!match(';') && !match('}') && !match(')') && lookahead.type !== Token.EOF) {
argument = parseAssignmentExpression();
}
}
state.allowYield = previousAllowYield;
}
return expr.finishYieldExpression(argument, delegate);
}
function parseAssignmentExpression() {
var token, expr, right, list, startToken;
startToken = lookahead;
token = lookahead;
if (!state.allowYield && matchKeyword('yield')) {
return parseYieldExpression();
}
expr = parseConditionalExpression();
if (expr.type === PlaceHolders.ArrowParameterPlaceHolder || match('=>')) {
isAssignmentTarget = isBindingElement = false;
list = reinterpretAsCoverFormalsList(expr);
if (list) {
firstCoverInitializedNameError = null;
return parseArrowFunctionExpression(list, new WrappingNode(startToken));
}
return expr;
}
if (matchAssign()) {
if (!isAssignmentTarget) {
tolerateError(Messages.InvalidLHSInAssignment);
}
if (strict && expr.type === Syntax.Identifier) {
if (isRestrictedWord(expr.name)) {
tolerateUnexpectedToken(token, Messages.StrictLHSAssignment);
}
if (isStrictModeReservedWord(expr.name)) {
tolerateUnexpectedToken(token, Messages.StrictReservedWord);
}
}
if (!match('=')) {
isAssignmentTarget = isBindingElement = false;
} else {
reinterpretExpressionAsPattern(expr);
}
token = lex();
right = isolateCoverGrammar(parseAssignmentExpression);
expr = new WrappingNode(startToken).finishAssignmentExpression(token.value, expr, right);
firstCoverInitializedNameError = null;
}
return expr;
}
function parseExpression() {
var expr, startToken = lookahead, expressions;