Provide access to the token types for external users of the + var _multiplyModulo = {binop: 10, beforeExpr: true};
'*' may be multiply or have special meaning in ES6
var _star = {binop: 10, beforeExpr: true};Provide access to the token types for external users of the tokenizer.
exports.tokTypes = {bracketL: _bracketL, bracketR: _bracketR, braceL: _braceL, braceR: _braceR,
parenL: _parenL, parenR: _parenR, comma: _comma, semi: _semi, colon: _colon,
dot: _dot, ellipsis: _ellipsis, question: _question, slash: _slash, eq: _eq,
name: _name, eof: _eof, num: _num, regexp: _regexp, string: _string,
arrow: _arrow, bquote: _bquote, dollarBraceL: _dollarBraceL};
- for (var kw in keywordTypes) exports.tokTypes["_" + kw] = keywordTypes[kw];This is a trick taken from Esprima. It turns out that, on + for (var kw in keywordTypes) exports.tokTypes["_" + kw] = keywordTypes[kw];
This is a trick taken from Esprima. It turns out that, on
non-Chrome browsers, to check whether a string is in a set, a
predicate containing a big ugly switch statement is faster than
a regular expression, and on Chrome the two are about on par.
@@ -256,7 +256,7 @@ predicate from a space-separated string of words.
When there are more than three length categories, an outer + }
When there are more than three length categories, an outer switch first dispatches on the lengths, to save on comparisons.
if (cats.length > 3) {
cats.sort(function(a, b) {return b.length - a.length;});
f += "switch(str.length){";
@@ -265,17 +265,17 @@ switch first dispatches on the lengths, to save on comparisons.
f += "case " + cat[0].length + ":";
compareTo(cat);
}
- f += "}";Otherwise, simply generate a flat switch statement.
} else {
+ f += "}";Otherwise, simply generate a flat switch statement.
} else {
compareTo(words);
}
return new Function("str", f);
- }The ECMAScript 3 reserved word list.
var isReservedWord3 = makePredicate("abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile");ECMAScript 5 reserved words.
var isReservedWord5 = makePredicate("class enum extends super const export import");The additional reserved words in strict mode.
var isStrictReservedWord = makePredicate("implements interface let package private protected public static yield");The forbidden variable names in strict mode.
var isStrictBadIdWord = makePredicate("eval arguments");And the keywords.
var ecma5AndLessKeywords = "break case catch continue debugger default do else finally for function if return switch throw try var while with null true false instanceof typeof void delete new in this";
+ }The ECMAScript 3 reserved word list.
var isReservedWord3 = makePredicate("abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile");ECMAScript 5 reserved words.
var isReservedWord5 = makePredicate("class enum extends super const export import");The additional reserved words in strict mode.
var isStrictReservedWord = makePredicate("implements interface let package private protected public static yield");The forbidden variable names in strict mode.
var isStrictBadIdWord = makePredicate("eval arguments");And the keywords.
var ecma5AndLessKeywords = "break case catch continue debugger default do else finally for function if return switch throw try var while with null true false instanceof typeof void delete new in this";
var isEcma5AndLessKeyword = makePredicate(ecma5AndLessKeywords);
var isEcma6Keyword = makePredicate(ecma5AndLessKeywords + " let const class extends export import yield");
- var isKeyword = isEcma5AndLessKeyword;Big ugly regular expressions that match characters in the + var isKeyword = isEcma5AndLessKeyword;
Big ugly regular expressions that match characters in the
whitespace, identifier, and identifier-start categories. These
are only applied when a character is found to actually have a
code point above 128.
@@ -283,14 +283,14 @@ Generated by tools/generate-identifier-regex.js.
Whether a single character denotes a newline.
var newline = /[\n\r\u2028\u2029]/;Matches a whole line break (where CRLF is considered a single -line break). Used to count lines.
var lineBreak = /\r\n|[\n\r\u2028\u2029]/g;Test whether a given character code starts an identifier.
var isIdentifierStart = exports.isIdentifierStart = function(code) {
+ var nonASCIIidentifier = new RegExp("[" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + "]");Whether a single character denotes a newline.
var newline = /[\n\r\u2028\u2029]/;Matches a whole line break (where CRLF is considered a single +line break). Used to count lines.
var lineBreak = /\r\n|[\n\r\u2028\u2029]/g;Test whether a given character code starts an identifier.
var isIdentifierStart = exports.isIdentifierStart = function(code) {
if (code < 65) return code === 36;
if (code < 91) return true;
if (code < 97) return code === 95;
if (code < 123)return true;
return code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code));
- };Test whether a given character is part of an identifier.
var isIdentifierChar = exports.isIdentifierChar = function(code) {
+ };Test whether a given character is part of an identifier.
var isIdentifierChar = exports.isIdentifierChar = function(code) {
if (code < 48) return code === 36;
if (code < 58) return true;
if (code < 65) return false;
@@ -298,18 +298,18 @@ line break). Used to count lines. These are used when options.locations is on, for the
+ };
These are used when options.locations is on, for the
tokStartLoc and tokEndLoc properties.
function Position() {
this.line = tokCurLine;
this.column = tokPos - tokLineStart;
- }Reset the token state. Used at the start of a parse.
function initTokenState() {
+ }Reset the token state. Used at the start of a parse.
function initTokenState() {
tokCurLine = 1;
tokPos = tokLineStart = 0;
tokRegexpAllowed = true;
metParenL = 0;
inTemplate = false;
skipSpace();
- }Called at the end of every token. Sets tokEnd, tokVal, and
+ }
Called at the end of every token. Sets tokEnd, tokVal, and
tokRegexpAllowed, and skips the space after the token, so that
the next one's tokStart will point at the right position.
function finishToken(type, val) {
tokEnd = tokPos;
@@ -349,7 +349,7 @@ the next one's tokStart will point at the right position.
if (options.onComment)
options.onComment(false, input.slice(start + 2, tokPos), start, tokPos,
startLoc, options.locations && new Position);
- }Called at the start of the parse and after every token. Skips + }
Called at the start of the parse and after every token. Skips whitespace and comments, and.
function skipSpace() {
while (tokPos < inputLen) {
var ch = input.charCodeAt(tokPos);
@@ -388,7 +388,7 @@ whitespace and comments, and. This is the function that is called to fetch the next token. It + }
This is the function that is called to fetch the next token. It is somewhat obscure, because it works in character codes rather than characters, and because operator parsing has been inlined into it.
@@ -416,10 +416,10 @@ into it. return finishOp(_slash, 1); } - function readToken_mult_modulo() { // '%*' + function readToken_mult_modulo(code) { // '%*' var next = input.charCodeAt(tokPos + 1); if (next === 61) return finishOp(_assign, 2); - return finishOp(_multiplyModulo, 1); + return finishOp(code === 42 ? _star : _multiplyModulo, 1); } function readToken_pipe_amp(code) { // '|&' @@ -439,7 +439,7 @@ into it. var next = input.charCodeAt(tokPos + 1); if (next === code) { if (next == 45 && input.charCodeAt(tokPos + 2) == 62 && - newline.test(input.slice(lastEnd, tokPos))) {A --> line comment
tokPos += 3;
+ newline.test(input.slice(lastEnd, tokPos))) {A --> line comment
tokPos += 3;
skipLineComment();
skipSpace();
return readToken();
@@ -459,7 +459,7 @@ into it.
return finishOp(_bitShift, size);
}
if (next == 33 && code == 60 && input.charCodeAt(tokPos + 2) == 45 &&
- input.charCodeAt(tokPos + 3) == 45) {<!--, an XML-style comment that should be interpreted as a line comment
tokPos += 4;
+ input.charCodeAt(tokPos + 3) == 45) {<!--, an XML-style comment that should be interpreted as a line comment
tokPos += 4;
skipLineComment();
skipSpace();
return readToken();
@@ -479,7 +479,7 @@ into it.
return finishOp(code === 61 ? _eq : _prefix, 1);
}
- function getTokenFromCode(code) {Special rules work inside ES6 template strings.
if (inTemplate) {'`' and '${' have special meanings, but they should follow string (can be empty)
if (tokType === _string) {
+ function getTokenFromCode(code) {Special rules work inside ES6 template strings.
if (inTemplate) {'`' and '${' have special meanings, but they should follow string (can be empty)
if (tokType === _string) {
if (code === 96) { // '`'
++tokPos;
return finishToken(_bquote);
@@ -488,12 +488,12 @@ into it.
tokPos += 2;
return finishToken(_dollarBraceL);
}
- }anything else is considered string literal
return readString();
+ }anything else is considered string literal
return readString();
}
- switch (code) {The interpretation of a dot depends on whether it is followed + switch (code) {
The interpretation of a dot depends on whether it is followed by a digit or another two dots.
case 46: // '.'
- return readToken_dot();Punctuation tokens.
case 40: ++tokPos; return finishToken(_parenL);
+ return readToken_dot();Punctuation tokens.
case 40: ++tokPos; return finishToken(_parenL);
case 41: ++tokPos; return finishToken(_parenR);
case 59: ++tokPos; return finishToken(_semi);
case 44: ++tokPos; return finishToken(_comma);
@@ -516,17 +516,17 @@ by a digit or another two dots. Anything else beginning with a digit is an integer, octal + }
Anything else beginning with a digit is an integer, octal number, or float.
case 49: case 50: case 51: case 52: case 53: case 54: case 55: case 56: case 57: // 1-9
- return readNumber(false);Quotes produce strings.
case 34: case 39: // '"', "'"
- return readString(code);Operators are parsed inline in tiny state machines. '=' (61) is + return readNumber(false);
Quotes produce strings.
case 34: case 39: // '"', "'"
+ return readString(code);Operators are parsed inline in tiny state machines. '=' (61) is
often referred to. finishOp simply skips the amount of
characters it is given as second argument, and returns a token
of the type given by its first argument.
case 47: // '/'
return readToken_slash();
case 37: case 42: // '%*'
- return readToken_mult_modulo();
+ return readToken_mult_modulo(code);
case 124: case 38: // '|&'
return readToken_pipe_amp(code);
@@ -557,12 +557,12 @@ of the type given by its first argument. Identifier or keyword. '\uXXXX' sequences are allowed in + var code = input.charCodeAt(tokPos);
Identifier or keyword. '\uXXXX' sequences are allowed in identifiers, so '\' also dispatches to that.
if (!inTemplate && (isIdentifierStart(code) || code === 92 /* '\' */)) return readWord();
var tok = getTokenFromCode(code);
- if (tok === false) {If we are here, we either found a non-ASCII identifier + if (tok === false) {
If we are here, we either found a non-ASCII identifier character, or something that's entirely disallowed.
var ch = String.fromCharCode(code);
if (ch === "\\" || nonASCIIidentifierStart.test(ch)) return readWord();
raise(tokPos, "Unexpected character '" + ch + "'");
@@ -574,7 +574,7 @@ character, or something that's entirely disallowed. Parse a regular expression. Some context-awareness is necessary, + }
Parse a regular expression. Some context-awareness is necessary, since a '/' inside a '[]' set does not end the expression.
function readRegexp() {
var content = "", escaped, inClass, start = tokPos;
for (;;) {
@@ -590,7 +590,7 @@ since a '/' inside a '[]' set does not end the expression. Need to use readWord1 because '\uXXXX' sequences are allowed
+ ++tokPos;
Need to use readWord1 because '\uXXXX' sequences are allowed
here (don't ask).
var mods = readWord1();
if (mods && !/^[gmsiy]*$/.test(mods)) raise(start, "Invalid regular expression flag");
try {
@@ -600,7 +600,7 @@ here (don't ask). Read an integer in the given radix. Return null if zero digits + }
Read an integer in the given radix. Return null if zero digits
were read, the integer value otherwise. When len is given, this
will return null unless the integer has exactly len digits.
function readInt(radix, len) {
var start = tokPos, total = 0;
@@ -625,7 +625,7 @@ will return null unless the integer has exactly len di
if (val == null) raise(tokStart + 2, "Expected number in radix " + radix);
if (isIdentifierStart(input.charCodeAt(tokPos))) raise(tokPos, "Identifier directly after number");
return finishToken(_num, val);
- }Read an integer, octal integer, or floating-point number.
function readNumber(startsWithDot) {
+ }Read an integer, octal integer, or floating-point number.
function readNumber(startsWithDot) {
var start = tokPos, isFloat = false, octal = input.charCodeAt(tokPos) === 48;
if (!startsWithDot && readInt(10) === null) raise(start, "Invalid number");
if (input.charCodeAt(tokPos) === 46) {
@@ -648,7 +648,7 @@ will return null unless the integer has exactly len di
else if (/[89]/.test(str) || strict) raise(start, "Invalid number");
else val = parseInt(str, 8);
return finishToken(_num, val);
- }Read a string value, interpreting backslash-escapes.
function readCodePoint() {
+ }Read a string value, interpreting backslash-escapes.
function readCodePoint() {
var ch = input.charCodeAt(tokPos), code;
if (ch === 123) {
@@ -659,7 +659,7 @@ will return null unless the integer has exactly len di
if (code > 0x10FFFF) unexpected();
} else {
code = readHexChar(4);
- }UTF-16 Encoding
if (code <= 0xFFFF) {
+ }UTF-16 Encoding
if (code <= 0xFFFF) {
return String.fromCharCode(code);
}
var cu1 = ((code - 0x10000) >> 10) + 0xD800;
@@ -712,7 +712,7 @@ will return null unless the integer has exactly len di
}
} else {
++tokPos;
- if (ch === 13 || ch === 10 || ch === 8232 || ch === 8233) {
+ if (newline.test(String.fromCharCode(ch))) {
if (inTemplate) {
if (ch === 13 && input.charCodeAt(tokPos) === 10) {
++tokPos;
@@ -729,13 +729,13 @@ will return null unless the integer has exactly len di
out += String.fromCharCode(ch); // '\'
}
}
- }Used to read character escape sequences ('\x', '\u', '\U').
function readHexChar(len) {
+ }Used to read character escape sequences ('\x', '\u', '\U').
function readHexChar(len) {
var n = readInt(16, len);
if (n === null) raise(tokStart, "Bad character escape sequence");
return n;
- }Used to signal to callers of readWord1 whether the word
+ }
Used to signal to callers of readWord1 whether the word
contained any escape sequences. This is needed because words with
-escape sequences must not be interpreted as keywords.
var containsEsc;Read an identifier, and return it as a string. Sets containsEsc
+escape sequences must not be interpreted as keywords.
var containsEsc;Read an identifier, and return it as a string. Sets containsEsc
to whether the word contained a '\u' escape.
Only builds up the word character-by-character when it actually @@ -765,14 +765,14 @@ containeds an escape, as a micro-optimization.
Read an identifier or keyword token. Will check for reserved + }
Read an identifier or keyword token. Will check for reserved words when necessary.
function readWord() {
var word = readWord1();
var type = _name;
if (!containsEsc && isKeyword(word))
type = keywordTypes[word];
return finishToken(type, word);
- }A recursive descent parser operates by defining functions for all + }
A recursive descent parser operates by defining functions for all
syntactic elements, and recursively calling those, each function
advancing the input stream and returning an AST node. Precedence
of constructs (for example, the fact that !x[1] means !(x[1])
@@ -786,12 +786,12 @@ way, it'll receive the node for x[1] already parsed, and wraps
operator precedence, because it is much more compact than using
the technique outlined above, which uses different, nesting
functions to specify precedence, for all of the ten binary
-precedence levels that JavaScript defines.
Continue to the next token.
function next() {
+precedence levels that JavaScript defines. Continue to the next token.
function next() {
lastStart = tokStart;
lastEnd = tokEnd;
lastEndLoc = tokEndLoc;
readToken();
- }Enter strict mode. Re-reads the next token to please pedantic + }
Enter strict mode. Re-reads the next token to please pedantic tests ("use strict"; 010; -- should fail).
function setStrict(strct) {
strict = strct;
tokPos = tokStart;
@@ -803,7 +803,7 @@ tests ("use strict"; 010; -- should fail). Start an AST node, attaching a start offset.
function Node() {
+ }Start an AST node, attaching a start offset.
function Node() {
this.type = null;
this.start = tokStart;
this.end = null;
@@ -826,7 +826,7 @@ tests ("use strict"; 010; -- should fail). Start a node whose start offset information should be based on + }
Start a node whose start offset information should be based on the start of another node. For example, a binary operator node is only started after its left-hand side has already been parsed.
function startNodeFrom(other) {
var node = new Node();
@@ -839,7 +839,7 @@ only started after its left-hand side has already been parsed. <
node.range = [other.range[0], 0];
return node;
- }Finish an AST node, adding type and end properties.
function finishNode(node, type) {
+ }Finish an AST node, adding type and end properties.
function finishNode(node, type) {
node.type = type;
node.end = lastEnd;
if (options.locations)
@@ -847,28 +847,112 @@ only started after its left-hand side has already been parsed. <
if (options.ranges)
node.range[1] = lastEnd;
return node;
- }Test whether a statement node is the string literal "use strict".
function isUseStrict(stmt) {
+ }Test whether a statement node is the string literal "use strict".
function isUseStrict(stmt) {
return options.ecmaVersion >= 5 && stmt.type === "ExpressionStatement" &&
stmt.expression.type === "Literal" && stmt.expression.value === "use strict";
- }Predicate that tests whether the next token is of the given + }
Predicate that tests whether the next token is of the given type, and if yes, consumes it as a side effect.
function eat(type) {
if (tokType === type) {
next();
return true;
+ } else {
+ return false;
}
- }Test whether a semicolon can be inserted at the current position.
function canInsertSemicolon() {
+ }Test whether a semicolon can be inserted at the current position.
function canInsertSemicolon() {
return !options.strictSemicolons &&
(tokType === _eof || tokType === _braceR || newline.test(input.slice(lastEnd, tokStart)));
- }Consume a semicolon, or, failing that, see if we are allowed to + }
Consume a semicolon, or, failing that, see if we are allowed to pretend that there is a semicolon at this position.
function semicolon() {
if (!eat(_semi) && !canInsertSemicolon()) unexpected();
- }Expect a token of a given type. If found, consume it, otherwise, + }
Expect a token of a given type. If found, consume it, otherwise, raise an unexpected token error.
function expect(type) {
- if (tokType === type) next();
- else unexpected();
- }Raise an unexpected token error.
function unexpected(pos) {
+ eat(type) || unexpected();
+ }Raise an unexpected token error.
function unexpected(pos) {
raise(pos != null ? pos : tokStart, "Unexpected token");
- }Verify that a node is an lval — something that can be assigned + }
Creates an empty hash object.
function hash() {
+ return Object.create(null);
+ }Convert existing expression atom to assignable pattern +if possible.
function toAssignable(node, allowSpread, checkType) {
+ if (options.ecmaVersion >= 6 && node) {
+ switch (node.type) {
+ case "Identifier":
+ case "MemberExpression":
+ break;
+
+ case "ObjectExpression":
+ node.type = "ObjectPattern";
+ for (var i = 0; i < node.properties.length; i++) {
+ var prop = node.properties[i];
+ if (prop.kind !== "init") unexpected(prop.key.start);
+ toAssignable(prop.value, false, checkType);
+ }
+ break;
+
+ case "ArrayExpression":
+ node.type = "ArrayPattern";
+ for (var i = 0, lastI = node.elements.length - 1; i <= lastI; i++) {
+ toAssignable(node.elements[i], i === lastI, checkType);
+ }
+ break;
+
+ case "SpreadElement":
+ if (allowSpread) {
+ toAssignable(node.argument, false, checkType);
+ checkSpreadAssign(node.argument);
+ } else {
+ unexpected(node.start);
+ }
+ break;
+
+ default:
+ if (checkType) unexpected(node.start);
+ }
+ }
+ return node;
+ }Checks if node can be assignable spread argument.
function checkSpreadAssign(node) {
+ if (node.type !== "Identifier" && node.type !== "ArrayPattern")
+ unexpected(node.start);
+ }Verify that argument names are not repeated, and it does not
+try to bind the words eval or arguments.
function checkFunctionParam(param, nameHash) {
+ switch (param.type) {
+ case "Identifier":
+ if (isStrictReservedWord(param.name) || isStrictBadIdWord(param.name))
+ raise(param.start, "Defining '" + param.name + "' in strict mode");
+ if (nameHash[param.name])
+ raise(param.start, "Argument name clash in strict mode");
+ nameHash[param.name] = true;
+ break;
+
+ case "ObjectPattern":
+ for (var i = 0; i < param.properties.length; i++)
+ checkFunctionParam(param.properties[i].value, nameHash);
+ break;
+
+ case "ArrayPattern":
+ for (var i = 0; i < param.elements.length; i++)
+ checkFunctionParam(param.elements[i], nameHash);
+ break;
+ }
+ }Check if property name clashes with already added. +Object/class getters and setters are not allowed to clash — +either with each other or with an init property — and in +strict mode, init properties are also not allowed to be repeated.
function checkPropClash(prop, defaultKind, propHash) {
+ var key = prop.key, name;
+ switch (key.type) {
+ case "Identifier": name = key.name; break;
+ case "Literal": name = String(key.value); break;
+ default: return;
+ }
+ var kind = prop.kind, other = propHash[name];
+ if (other) {
+ var isGetSet = kind !== defaultKind;
+ if ((strict || isGetSet) && other[kind] || !(isGetSet ^ other[defaultKind]))
+ raise(key.start, "Redefinition of property");
+ } else {
+ other = propHash[name] = hash();
+ }
+ other[kind] = true;
+ }Verify that a node is an lval — something that can be assigned to.
function checkLVal(expr, isBinding) {
switch (expr.type) {
case "Identifier":
@@ -900,7 +984,7 @@ to. Parse a program. Initializes the parser, reads any number of + }
Parse a program. Initializes the parser, reads any number of
statements, and wraps them in a Program node. Optionally takes a
program argument. If present, the statements will be appended
to its body instead of creating a new node.
function parseTopLevel(program) {
@@ -921,7 +1005,7 @@ to its body instead of creating a new node. Parse a single statement.
+ var loopLabel = {kind: "loop"}, switchLabel = {kind: "switch"};Parse a single statement.
If expecting a statement and finding a slash operator, parse a regular expression literal. This is to handle cases like @@ -930,7 +1014,7 @@ does not help.
Most types of statements are recognized by the keyword they + var starttype = tokType, node = startNode();
Most types of statements are recognized by the keyword they start with. Many are trivial to parse, some require a bit of complexity.
switch (starttype) {
case _break: case _continue: return parseBreakContinueStatement(node, starttype.keyword);
@@ -950,7 +1034,7 @@ complexity. If the statement does not start with a statement keyword or a + case _import: return parseImport(node);
If the statement does not start with a statement keyword or a brace, it's an ExpressionStatement or LabeledStatement. We simply start parsing an expression, and afterwards, if the next token is a colon and the expression was a simple @@ -970,7 +1054,7 @@ Identifier node, we switch to interpreting it as a label.
Verify that there is an actual destination to break or + }
Verify that there is an actual destination to break or continue to.
for (var i = 0; i < labels.length; ++i) {
var lab = labels[i];
if (node.label == null || lab.name === node.label.name) {
@@ -998,7 +1082,7 @@ continue to. Disambiguating between a for and a for/in or for/of
+
Disambiguating between a for and a for/in or for/of
loop is non-trivial. Basically, we have to parse the init var
statement or expression, disallowing the in operator (see
the second parameter to parseExpression), and then check
@@ -1044,7 +1128,7 @@ is a regular for loop.
In return (and break/continue), the keywords with
+ next();
In return (and break/continue), the keywords with
optional arguments, we eagerly look for a semicolon or the
possibility to insert one.
if (eat(_semi) || canInsertSemicolon()) node.argument = null;
else { node.argument = parseExpression(); semicolon(); }
@@ -1056,7 +1140,7 @@ possibility to insert one. Statements under must be grouped (by label) in SwitchCase + labels.push(switchLabel);
Statements under must be grouped (by label) in SwitchCase
nodes. cur is used to keep the node that we are currently
adding statements to.
for (var cur, sawDefault; tokType != _braceR;) {
if (tokType === _case || tokType === _default) {
@@ -1158,13 +1242,13 @@ adding statements to. Used for constructs like switch and if that insist on
+ }
Used for constructs like switch and if that insist on
parentheses around their expression.
function parseParenExpression() {
expect(_parenL);
var val = parseExpression();
expect(_parenR);
return val;
- }Parse a semicolon-enclosed block of statements, handling "use
+ }
Parse a semicolon-enclosed block of statements, handling "use
strict" declarations when allowStrict is true (used for
function bodies).
function parseBlock(allowStrict) {
var node = startNode(), first = true, strict = false, oldStrict;
@@ -1181,7 +1265,7 @@ function bodies). Parse a regular for loop. The disambiguation code in
+ }
Parse a regular for loop. The disambiguation code in
parseStatement will already have parsed the init statement or
expression.
function parseFor(node, init) {
node.init = init;
@@ -1193,7 +1277,7 @@ expression. Parse a for/in and for/of loop, which are almost
+ }
Parse a for/in and for/of loop, which are almost
same from parser's perspective.
function parseForIn(node, init) {
var type = tokType === _in ? "ForInStatement" : "ForOfStatement";
next();
@@ -1203,7 +1287,7 @@ same from parser's perspective. Parse a list of variable declarations.
function parseVar(node, noIn, kind) {
+ }Parse a list of variable declarations.
function parseVar(node, noIn, kind) {
node.declarations = [];
node.kind = kind;
for (;;) {
@@ -1215,11 +1299,11 @@ same from parser's perspective. These nest, from the most general expression type at the top to + }
These nest, from the most general expression type at the top to 'atomic', nondivisible expression types at the bottom. Most of the functions will simply let the function(s) below them parse, and, if the syntactic construct they handle is present, wrap -the AST node that the inner parser gave them in another node.
Parse a full expression. The arguments are used to forbid comma +the AST node that the inner parser gave them in another node.
Parse a full expression. The arguments are used to forbid comma
sequences (in argument lists, array literals, or object literals)
or the in operator (in for loops initalization expressions).
function parseExpression(noComma, noIn) {
var expr = parseMaybeAssign(noIn);
@@ -1230,7 +1314,7 @@ or the in operator (in for loops initalization expressions).
return finishNode(node, "SequenceExpression");
}
return expr;
- }Parse an assignment expression. This includes applications of + }
Parse an assignment expression. This includes applications of
operators like +=.
function parseMaybeAssign(noIn) {
var left = parseMaybeConditional(noIn);
if (tokType.isAssign) {
@@ -1243,7 +1327,7 @@ operators like +=. Parse a ternary conditional (?:) operator.
function parseMaybeConditional(noIn) {
+ }Parse a ternary conditional (?:) operator.
function parseMaybeConditional(noIn) {
var expr = parseExprOps(noIn);
if (eat(_question)) {
var node = startNodeFrom(expr);
@@ -1254,9 +1338,9 @@ operators like +=. Start the precedence parser.
function parseExprOps(noIn) {
+ }Start the precedence parser.
function parseExprOps(noIn) {
return parseExprOp(parseMaybeUnary(), -1, noIn);
- }Parse binary operators with the operator precedence parsing + }
Parse binary operators with the operator precedence parsing
algorithm. left is the left-hand side of the operator.
minPrec provides context that allows the function to stop and
defer further parser to one of its callers when it encounters an
@@ -1275,7 +1359,7 @@ operator that has a lower precedence than the set it is parsing.
Parse unary operators, both prefix and postfix.
function parseMaybeUnary() {
+ }Parse unary operators, both prefix and postfix.
function parseMaybeUnary() {
if (tokType.prefix) {
var node = startNode(), update = tokType.isUpdate;
node.operator = tokVal;
@@ -1300,7 +1384,7 @@ operator that has a lower precedence than the set it is parsing.
expr = finishNode(node, "UpdateExpression");
}
return expr;
- }Parse call, dot, and []-subscript expressions.
function parseExprSubscripts() {
+ }Parse call, dot, and []-subscript expressions.
function parseExprSubscripts() {
return parseSubscripts(parseExprAtom());
}
@@ -1329,7 +1413,7 @@ operator that has a lower precedence than the set it is parsing.
node.quasi = parseTemplate();
return parseSubscripts(finishNode(node, "TaggedTemplateExpression"), noCalls);
} return base;
- }Parse an atomic expression — either a single token that is an + }
Parse an atomic expression — either a single token that is an
expression, an expression started by a keyword like function or
new, or an expression wrapped in punctuation like (), [],
or {}.
function parseExprAtom() {
@@ -1373,9 +1457,9 @@ or {}. if '=>' follows '(...)', convert contents to arguments
if (metParenL === oldParenL && eat(_arrow)) {
+ expect(_parenR);if '=>' follows '(...)', convert contents to arguments
if (metParenL === oldParenL && eat(_arrow)) {
val = parseArrowExpression(node, exprList);
- } else {forbid '()' before everything but '=>'
if (!val) unexpected(lastStart);forbid '...' in sequence expressions
if (options.ecmaVersion >= 6) {
+ } else {forbid '()' before everything but '=>'
if (!val) unexpected(lastStart);forbid '...' in sequence expressions
if (options.ecmaVersion >= 6) {
for (var i = 0; i < exprList.length; i++) {
if (exprList[i].type === "SpreadElement") unexpected();
}
@@ -1394,7 +1478,7 @@ or {}. check whether this is array comprehension or regular array
if (options.ecmaVersion >= 6 && tokType === _for) {
+ next();check whether this is array comprehension or regular array
if (options.ecmaVersion >= 6 && tokType === _for) {
node.blocks = [];
while (tokType === _for) {
var block = startNode();
@@ -1403,7 +1487,7 @@ or {}. of property is here for compatibility with Esprima's AST
+ next();
of property is here for compatibility with Esprima's AST
which also supports deprecated [for (... in ...) expr]
block.of = true;
block.right = parseExpression();
expect(_parenR);
@@ -1440,7 +1524,7 @@ which also supports deprecated [for (... in ...) expr] New's precedence is slightly tricky. It must allow its argument + }
New's precedence is slightly tricky. It must allow its argument
to be a [] or dot subscript expression, but not a call — at
least, not without wrapping it in parentheses. Thus, it uses the
function parseNew() {
var node = startNode();
@@ -1449,12 +1533,12 @@ least, not without wrapping it in parentheses. Thus, it uses the
if (eat(_parenL)) node.arguments = parseExprList(_parenR, false);
else node.arguments = empty;
return finishNode(node, "NewExpression");
- }Parse spread element '...expr'
function parseSpread() {
+ }Parse spread element '...expr'
function parseSpread() {
var node = startNode();
next();
node.argument = parseExpression(true);
return finishNode(node, "SpreadElement");
- }Parse template expression.
function parseTemplate() {
+ }Parse template expression.
function parseTemplate() {
var node = startNode();
node.expressions = [];
node.quasis = [];
@@ -1478,8 +1562,8 @@ least, not without wrapping it in parentheses. Thus, it uses the
}
inTemplate = false;
return finishNode(node, "TemplateLiteral");
- }Parse an object literal.
function parseObj() {
- var node = startNode(), first = true, sawGetSet = false;
+ }Parse an object literal.
function parseObj() {
+ var node = startNode(), first = true, propHash = hash();
node.properties = [];
next();
while (!eat(_braceR)) {
@@ -1492,7 +1576,7 @@ least, not without wrapping it in parentheses. Thus, it uses the
if (options.ecmaVersion >= 6) {
prop.method = false;
prop.shorthand = false;
- isGenerator = isStar(true);
+ isGenerator = eat(_star);
}
parsePropertyName(prop);
if (eat(_colon)) {
@@ -1505,7 +1589,6 @@ least, not without wrapping it in parentheses. Thus, it uses the
} else if (options.ecmaVersion >= 5 && !prop.computed && prop.key.type === "Identifier" &&
(prop.key.name === "get" || prop.key.name === "set")) {
if (isGenerator) unexpected();
- sawGetSet = true;
kind = prop.kind = prop.key.name;
parsePropertyName(prop);
prop.value = parseMethod(false);
@@ -1515,26 +1598,10 @@ least, not without wrapping it in parentheses. Thus, it uses the
prop.shorthand = true;
} else unexpected();
- addProperty(node.properties, finishNode(prop, "Property"), sawGetSet, "init");
+ checkPropClash(prop, "init", propHash);
+ node.properties.push(finishNode(prop, "Property"));
}
return finishNode(node, "ObjectExpression");
- }Add property to list with keeping in mind and checking that -object/class getters and setters are not allowed to clash — -either with each other or with an init property — and in -strict mode, init properties are also not allowed to be repeated.
function addProperty(props, current, sawGetSet, defaultKind) {
- if (current.key.type === "Identifier" && (strict || sawGetSet)) {
- var kind = current.kind, isGetSet = kind !== defaultKind;
- for (var i = 0; i < props.length; ++i) {
- var other = props[i];
- if (other.key.name === current.key.name && other.static === current.static) {
- var conflict = kind == other.kind || isGetSet && other.kind === defaultKind ||
- kind === defaultKind && (other.kind !== defaultKind);
- if (conflict && !strict && kind === defaultKind && other.kind === defaultKind) conflict = false;
- if (conflict) raise(current.key.start, "Redefinition of property");
- }
- }
- }
- props.push(current);
}
function parsePropertyName(prop) {
@@ -1549,7 +1616,7 @@ strict mode, init properties are also not allowed to be repeated.
}
}
prop.key = (tokType === _num || tokType === _string) ? parseExprAtom() : parseIdent(true);
- }Initialize empty function node.
function initFunction(node) {
+ }Initialize empty function node.
function initFunction(node) {
node.id = null;
node.params = [];
if (options.ecmaVersion >= 6) {
@@ -1557,18 +1624,11 @@ strict mode, init properties are also not allowed to be repeated.
node.rest = null;
node.generator = false;
}
- }Checks if there's star sign ('*').
function isStar(moveOn) {
- if (tokType === _multiplyModulo && tokVal === '*') {
- if (moveOn) next();
- return true;
- } else {
- return false;
- }
- }Parse a function declaration or literal (depending on the + }
Parse a function declaration or literal (depending on the
isStatement parameter).
function parseFunction(node, isStatement, allowExpressionBody) {
initFunction(node);
if (options.ecmaVersion >= 6) {
- node.generator = isStar(true);
+ node.generator = eat(_star);
}
if (isStatement || tokType === _name) {
node.id = parseIdent();
@@ -1576,7 +1636,7 @@ strict mode, init properties are also not allowed to be repeated.
parseFunctionParams(node);
parseFunctionBody(node, allowExpressionBody);
return finishNode(node, isStatement ? "FunctionDeclaration" : "FunctionExpression");
- }Parse object or class method.
function parseMethod(isGenerator) {
+ }Parse object or class method.
function parseMethod(isGenerator) {
var node = startNode();
initFunction(node);
parseFunctionParams(node);
@@ -1589,7 +1649,7 @@ strict mode, init properties are also not allowed to be repeated.
}
parseFunctionBody(node, allowExpressionBody);
return finishNode(node, "FunctionExpression");
- }Parse arrow function expression with given parameters.
function parseArrowExpression(node, params) {
+ }Parse arrow function expression with given parameters.
function parseArrowExpression(node, params) {
initFunction(node);
var defaults = node.defaults, hasDefaults = false;
@@ -1617,7 +1677,7 @@ strict mode, init properties are also not allowed to be repeated.
parseFunctionBody(node, true);
return finishNode(node, "ArrowFunctionExpression");
- }Parse function parameters.
function parseFunctionParams(node) {
+ }Parse function parameters.
function parseFunctionParams(node) {
var defaults = [], hasDefaults = false;
expect(_parenL);
@@ -1644,22 +1704,22 @@ strict mode, init properties are also not allowed to be repeated.
}
if (hasDefaults) node.defaults = defaults;
- }Parse function body and check parameters.
function parseFunctionBody(node, allowExpression) {
+ }Parse function body and check parameters.
function parseFunctionBody(node, allowExpression) {
var isExpression = allowExpression && tokType !== _braceL;
if (isExpression) {
node.body = parseExpression(true);
node.expression = true;
- } else {Start a new scope with regard to labels and the inFunction
+ } else {
Start a new scope with regard to labels and the inFunction
flag (restore them to their old value afterwards).
var oldInFunc = inFunction, oldInGen = inGenerator, oldLabels = labels;
inFunction = true; inGenerator = node.generator; labels = [];
node.body = parseBlock(true);
node.expression = false;
inFunction = oldInFunc; inGenerator = oldInGen; labels = oldLabels;
- }If this is a strict mode function, verify that argument names + }
If this is a strict mode function, verify that argument names
are not repeated, and it does not try to bind the words eval
or arguments.
if (strict || !isExpression && node.body.body.length && isUseStrict(node.body.body[0])) {
- var nameHash = {};
+ var nameHash = hash();
if (node.id)
checkFunctionParam(node.id, nameHash);
for (var i = 0; i < node.params.length; i++)
@@ -1667,34 +1727,13 @@ or arguments. Verify that argument names are not repeated, and it does not
-try to bind the words eval or arguments.
function checkFunctionParam(param, nameHash) {
- switch (param.type) {
- case "Identifier":
- if (isStrictReservedWord(param.name) || isStrictBadIdWord(param.name))
- raise(param.start, "Defining '" + param.name + "' in strict mode");
- if (param.name in nameHash)
- raise(param.start, "Argument name clash in strict mode");
- nameHash[param.name] = true;
- break;
-
- case "ObjectPattern":
- for (var i = 0; i < param.properties.length; i++)
- checkFunctionParam(param.properties[i].value, nameHash);
- break;
-
- case "ArrayPattern":
- for (var i = 0; i < param.elements.length; i++)
- checkFunctionParam(param.elements[i], nameHash);
- break;
- }
- }Parse a class declaration or literal (depending on the + }
Parse a class declaration or literal (depending on the
isStatement parameter).
function parseClass(node, isStatement) {
next();
node.id = tokType === _name ? parseIdent() : isStatement ? unexpected() : null;
node.superClass = eat(_extends) ? parseExpression() : null;
- var classBody = startNode(), sawGetSet = false;
+ var classBody = startNode(), methodHash = hash(), staticMethodHash = hash();
classBody.body = [];
expect(_braceL);
while (!eat(_braceR)) {
@@ -1705,23 +1744,23 @@ try to bind the words eval or arguments.
} else {
method.static = false;
}
- var isGenerator = isStar(true);
+ var isGenerator = eat(_star);
method.key = parseIdent(true);
if ((method.key.name === "get" || method.key.name === "set") && tokType === _name) {
if (isGenerator) unexpected();
method.kind = method.key.name;
method.key = parseIdent(true);
- sawGetSet = true;
} else {
method.kind = "";
}
method.value = parseMethod(isGenerator);
- addProperty(classBody.body, finishNode(method, "MethodDefinition"), sawGetSet, "");
+ checkPropClash(method, "", method.static ? staticMethodHash : methodHash);
+ classBody.body.push(finishNode(method, "MethodDefinition"));
eat(_semi);
}
node.body = finishNode(classBody, "ClassBody");
return finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression");
- }Parses a comma-separated list of expressions, and returns them as + }
Parses a comma-separated list of expressions, and returns them as
an array. close is the token type that ends the list, and
allowEmpty can be turned on to allow subsequent commas with
nothing in between them to be parsed as null (which is needed
@@ -1737,7 +1776,7 @@ for array literals).
Parse the next token as an identifier. If liberal is true (used
+ }
Parse the next token as an identifier. If liberal is true (used
when parsing properties), it will also convert keywords into
identifiers.
function parseIdent(liberal) {
var node = startNode();
@@ -1758,61 +1797,20 @@ identifiers. Convert existing expression atom to assignable pattern -if possible.
function toAssignable(node, allowSpread, checkType) {
- if (options.ecmaVersion >= 6 && node) {
- switch (node.type) {
- case "Identifier":
- case "MemberExpression":
- break;
-
- case "ObjectExpression":
- node.type = "ObjectPattern";
- for (var i = 0; i < node.properties.length; i++) {
- var prop = node.properties[i];
- if (prop.kind !== "init") unexpected(prop.key.start);
- toAssignable(prop.value, false, checkType);
- }
- break;
-
- case "ArrayExpression":
- node.type = "ArrayPattern";
- for (var i = 0, lastI = node.elements.length - 1; i <= lastI; i++) {
- toAssignable(node.elements[i], i === lastI, checkType);
- }
- break;
-
- case "SpreadElement":
- if (allowSpread) {
- toAssignable(node.argument, false, checkType);
- checkSpreadAssign(node.argument);
- } else {
- unexpected(node.start);
- }
- break;
-
- default:
- if (checkType) unexpected(node.start);
- }
- }
- return node;
- }Checks if node can be assignable spread argument.
function checkSpreadAssign(node) {
- if (node.type !== "Identifier" && node.type !== "ArrayPattern")
- unexpected(node.start);
- }Parses module export declaration.
function parseExport(node) {
- next();export var|const|let|function|class ...;
if (tokType === _var || tokType === _const || tokType === _let || tokType === _function || tokType === _class) {
+ }Parses module export declaration.
function parseExport(node) {
+ next();export var|const|let|function|class ...;
if (tokType === _var || tokType === _const || tokType === _let || tokType === _function || tokType === _class) {
node.declaration = parseStatement();
node.default = false;
node.specifiers = null;
node.source = null;
- } elseexport default ...;
if (eat(_default)) {
+ } elseexport default ...;
if (eat(_default)) {
node.declaration = parseExpression(true);
node.default = true;
node.specifiers = null;
node.source = null;
semicolon();
- } else {export * from '...' -export { x, y as z } [from '...']
var isBatch = isStar();
+ } else {export * from '...' +export { x, y as z } [from '...']
var isBatch = tokType === _star;
node.declaration = null;
node.default = false;
node.specifiers = parseExportSpecifiers();
@@ -1825,12 +1823,12 @@ export { x, y as z } [from '...'] Parses a comma-separated list of module exports.
function parseExportSpecifiers() {
+ }Parses a comma-separated list of module exports.
function parseExportSpecifiers() {
var nodes = [], first = true;
- if (isStar()) {export * from '...'
var node = startNode();
+ if (tokType === _star) {export * from '...'
var node = startNode();
next();
nodes.push(finishNode(node, "ExportBatchSpecifier"));
- } else {export { x, y as z } [from '...']
expect(_braceL);
+ } else {export { x, y as z } [from '...']
expect(_braceL);
while (!eat(_braceR)) {
if (!first) {
expect(_comma);
@@ -1849,8 +1847,8 @@ export { x, y as z } [from '...'] Parses import declaration.
function parseImport(node) {
- next();import '...';
if (tokType === _string) {
+ }Parses import declaration.
function parseImport(node) {
+ next();import '...';
if (tokType === _string) {
node.specifiers = [];
node.source = parseExprAtom();
node.kind = "";
@@ -1858,13 +1856,13 @@ export { x, y as z } [from '...'] only for backward compatibility with Esprima's AST + node.source = tokType === _string ? parseExprAtom() : unexpected();
only for backward compatibility with Esprima's AST (it doesn't support mixed default + named yet)
node.kind = node.specifiers[0].default ? "default" : "named";
}
return finishNode(node, "ImportDeclaration");
- }Parses a comma-separated list of module imports.
function parseImportSpecifiers() {
+ }Parses a comma-separated list of module imports.
function parseImportSpecifiers() {
var nodes = [], first = true;
- if (isStar()) {
+ if (tokType === _star) {
var node = startNode();
next();
if (tokType !== _name || tokVal !== "as") unexpected();
@@ -1874,7 +1872,7 @@ export { x, y as z } [from '...'] import defaultObj, { x, y as z } from '...'
var node = startNode();
+ if (tokType === _name) {import defaultObj, { x, y as z } from '...'
var node = startNode();
node.id = parseIdent();
checkLVal(node.id, true);
node.name = null;
@@ -1902,10 +1900,10 @@ export { x, y as z } [from '...'] Parses yield expression inside generator.
function parseYield() {
+ }Parses yield expression inside generator.
function parseYield() {
var node = startNode();
next();
- node.delegate = isStar(true);
+ node.delegate = eat(_star);
node.argument = parseExpression(true);
return finishNode(node, "YieldExpression");
}