gecko/toolkit/devtools/acorn/acorn_loose.js
Nick Fitzgerald 7b4cbd85cf Bug 1114962 - Update the in-tree copies of acorn and pretty-fast. r=past
acorn is now at db59bd0296c16796a07e82d2dc284861f464603e (untagged commit after
0.11.0 release).

pretty-fast is now at abc8c1133cc5443fb3bb50c426731821d27300a6 (tagged 0.2.0).
2015-01-06 15:24:00 -05:00

1174 lines
35 KiB
JavaScript

// Acorn: Loose parser
//
// This module provides an alternative parser (`parse_dammit`) that
// exposes that same interface as `parse`, but will try to parse
// anything as JavaScript, repairing syntax error the best it can.
// There are circumstances in which it will raise an error and give
// up, but they are very rare. The resulting AST will be a mostly
// valid JavaScript AST (as per the [Mozilla parser API][api], except
// that:
//
// - Return outside functions is allowed
//
// - Label consistency (no conflicts, break only to existing labels)
// is not enforced.
//
// - Bogus Identifier nodes with a name of `"✖"` are inserted whenever
// the parser got too confused to return anything meaningful.
//
// [api]: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API
//
// The expected use for this is to *first* try `acorn.parse`, and only
// if that fails switch to `parse_dammit`. The loose parser might
// parse badly indented code incorrectly, so **don't** use it as
// your default parser.
//
// Quite a lot of acorn.js is duplicated here. The alternative was to
// add a *lot* of extra cruft to that file, making it less readable
// and slower. Copying and editing the code allowed me to make
// invasive changes and simplifications without creating a complicated
// tangle.
(function(root, mod) {
if (typeof exports == "object" && typeof module == "object") return mod(exports, require("./acorn")); // CommonJS
if (typeof define == "function" && define.amd) return define(["exports", "./acorn"], mod); // AMD
mod(root.acorn || (root.acorn = {}), root.acorn); // Plain browser env
})(this, function(exports, acorn) {
"use strict";
var tt = acorn.tokTypes;
var options, input, fetchToken, context;
acorn.defaultOptions.tabSize = 4;
exports.parse_dammit = function(inpt, opts) {
if (!opts) opts = {};
input = String(inpt);
fetchToken = acorn.tokenize(input, opts);
options = fetchToken.options;
sourceFile = options.sourceFile || null;
context = [];
nextLineStart = 0;
ahead.length = 0;
next();
return parseTopLevel();
};
var lastEnd, token = {start: 0, end: 0}, ahead = [];
var curLineStart, nextLineStart, curIndent, lastEndLoc, sourceFile;
function next(forceRegexp) {
lastEnd = token.end;
if (options.locations)
lastEndLoc = token.endLoc;
if (forceRegexp)
ahead.length = 0;
token = ahead.shift() || readToken(forceRegexp);
if (token.start >= nextLineStart) {
while (token.start >= nextLineStart) {
curLineStart = nextLineStart;
nextLineStart = lineEnd(curLineStart) + 1;
}
curIndent = indentationAfter(curLineStart);
}
}
function readToken(forceRegexp) {
for (;;) {
try {
var tok = fetchToken(forceRegexp);
if (tok.type === tt.dot && input.substr(tok.end, 1) === '.') {
tok = fetchToken();
tok.start--;
tok.type = tt.ellipsis;
}
return tok;
} catch(e) {
if (!(e instanceof SyntaxError)) throw e;
// Try to skip some text, based on the error message, and then continue
var msg = e.message, pos = e.raisedAt, replace = true;
if (/unterminated/i.test(msg)) {
pos = lineEnd(e.pos + 1);
if (/string/.test(msg)) {
replace = {start: e.pos, end: pos, type: tt.string, value: input.slice(e.pos + 1, pos)};
} else if (/regular expr/i.test(msg)) {
var re = input.slice(e.pos, pos);
try { re = new RegExp(re); } catch(e) {}
replace = {start: e.pos, end: pos, type: tt.regexp, value: re};
} else if (/template/.test(msg)) {
replace = {start: e.pos, end: pos,
type: input.charAt(e.pos) == "`" ? tt.template : tt.templateContinued,
value: input.slice(e.pos + 1, pos)};
} else {
replace = false;
}
} else if (/invalid (unicode|regexp|number)|expecting unicode|octal literal|is reserved|directly after number/i.test(msg)) {
while (pos < input.length && !isSpace(input.charCodeAt(pos))) ++pos;
} else if (/character escape|expected hexadecimal/i.test(msg)) {
while (pos < input.length) {
var ch = input.charCodeAt(pos++);
if (ch === 34 || ch === 39 || isNewline(ch)) break;
}
} else if (/unexpected character/i.test(msg)) {
pos++;
replace = false;
} else if (/regular expression/i.test(msg)) {
replace = true;
} else {
throw e;
}
resetTo(pos);
if (replace === true) replace = {start: pos, end: pos, type: tt.name, value: "✖"};
if (replace) {
if (options.locations) {
replace.startLoc = acorn.getLineInfo(input, replace.start);
replace.endLoc = acorn.getLineInfo(input, replace.end);
}
return replace;
}
}
}
}
function resetTo(pos) {
for (;;) {
try {
var ch = input.charAt(pos - 1);
var reAllowed = !ch || /[\[\{\(,;:?\/*=+\-~!|&%^<>]/.test(ch) ||
/[enwfd]/.test(ch) && /\b(keywords|case|else|return|throw|new|in|(instance|type)of|delete|void)$/.test(input.slice(pos - 10, pos));
return fetchToken.jumpTo(pos, reAllowed);
} catch(e) {
if (!(e instanceof SyntaxError && /unterminated comment/i.test(e.message))) throw e;
pos = lineEnd(e.pos + 1);
if (pos >= input.length) return;
}
}
}
function lookAhead(n) {
while (n > ahead.length)
ahead.push(readToken());
return ahead[n-1];
}
var newline = /[\n\r\u2028\u2029]/;
function isNewline(ch) {
return ch === 10 || ch === 13 || ch === 8232 || ch === 8329;
}
function isSpace(ch) {
return (ch < 14 && ch > 8) || ch === 32 || ch === 160 || isNewline(ch);
}
function pushCx() {
context.push(curIndent);
}
function popCx() {
curIndent = context.pop();
}
function lineEnd(pos) {
while (pos < input.length && !isNewline(input.charCodeAt(pos))) ++pos;
return pos;
}
function indentationAfter(pos) {
for (var count = 0;; ++pos) {
var ch = input.charCodeAt(pos);
if (ch === 32) ++count;
else if (ch === 9) count += options.tabSize;
else return count;
}
}
function closes(closeTok, indent, line, blockHeuristic) {
if (token.type === closeTok || token.type === tt.eof) return true;
if (line != curLineStart && curIndent < indent && tokenStartsLine() &&
(!blockHeuristic || nextLineStart >= input.length ||
indentationAfter(nextLineStart) < indent)) return true;
return false;
}
function tokenStartsLine() {
for (var p = token.start - 1; p >= curLineStart; --p) {
var ch = input.charCodeAt(p);
if (ch !== 9 && ch !== 32) return false;
}
return true;
}
function Node(start) {
this.type = null;
this.start = start;
this.end = null;
}
Node.prototype = acorn.Node.prototype;
function SourceLocation(start) {
this.start = start || token.startLoc || {line: 1, column: 0};
this.end = null;
if (sourceFile !== null) this.source = sourceFile;
}
function startNode() {
var node = new Node(token.start);
if (options.locations)
node.loc = new SourceLocation();
if (options.directSourceFile)
node.sourceFile = options.directSourceFile;
if (options.ranges)
node.range = [token.start, 0];
return node;
}
function storeCurrentPos() {
return options.locations ? [token.start, token.startLoc] : token.start;
}
function startNodeAt(pos) {
var node;
if (options.locations) {
node = new Node(pos[0]);
node.loc = new SourceLocation(pos[1]);
} else {
node = new Node(pos);
}
if (options.directSourceFile)
node.sourceFile = options.directSourceFile;
if (options.ranges)
node.range = [pos[0], 0];
return node;
}
function finishNode(node, type) {
node.type = type;
node.end = lastEnd;
if (options.locations)
node.loc.end = lastEndLoc;
if (options.ranges)
node.range[1] = lastEnd;
return node;
}
function finishNodeAt(node, type, pos) {
if (options.locations) { node.loc.end = pos[1]; pos = pos[0]; }
node.type = type;
node.end = pos;
if (options.ranges) node.range[1] = pos;
return node;
}
function dummyIdent() {
var dummy = startNode();
dummy.name = "✖";
return finishNode(dummy, "Identifier");
}
function isDummy(node) { return node.name == "✖"; }
function eat(type) {
if (token.type === type) {
next();
return true;
} else {
return false;
}
}
function canInsertSemicolon() {
return (token.type === tt.eof || token.type === tt.braceR || newline.test(input.slice(lastEnd, token.start)));
}
function semicolon() {
return eat(tt.semi);
}
function expect(type) {
if (eat(type)) return true;
if (lookAhead(1).type == type) {
next(); next();
return true;
}
if (lookAhead(2).type == type) {
next(); next(); next();
return true;
}
}
function checkLVal(expr) {
if (!expr) return expr;
switch (expr.type) {
case "Identifier":
case "MemberExpression":
case "ObjectPattern":
case "ArrayPattern":
case "SpreadElement":
case "AssignmentPattern":
return expr;
default:
return dummyIdent();
}
}
function parseTopLevel() {
var node = startNodeAt(options.locations ? [0, acorn.getLineInfo(input, 0)] : 0);
node.body = [];
while (token.type !== tt.eof) node.body.push(parseStatement());
lastEnd = token.end;
lastEndLoc = token.endLoc;
return finishNode(node, "Program");
}
function parseStatement() {
if (token.type === tt.slash || token.type === tt.assign && token.value === "/=")
next(true);
var starttype = token.type, node = startNode();
switch (starttype) {
case tt._break: case tt._continue:
next();
var isBreak = starttype === tt._break;
if (semicolon() || canInsertSemicolon()) {
node.label = null;
} else {
node.label = token.type === tt.name ? parseIdent() : null;
semicolon();
}
return finishNode(node, isBreak ? "BreakStatement" : "ContinueStatement");
case tt._debugger:
next();
semicolon();
return finishNode(node, "DebuggerStatement");
case tt._do:
next();
node.body = parseStatement();
node.test = eat(tt._while) ? parseParenExpression() : dummyIdent();
semicolon();
return finishNode(node, "DoWhileStatement");
case tt._for:
next();
pushCx();
expect(tt.parenL);
if (token.type === tt.semi) return parseFor(node, null);
if (token.type === tt._var || token.type === tt._let) {
var init = parseVar(true);
if (init.declarations.length === 1 && (token.type === tt._in || token.type === tt.name && token.value === "of")) {
return parseForIn(node, init);
}
return parseFor(node, init);
}
var init = parseExpression(false, true);
if (token.type === tt._in || token.type === tt.name && token.value === "of") {
return parseForIn(node, checkLVal(init));
}
return parseFor(node, init);
case tt._function:
next();
return parseFunction(node, true);
case tt._if:
next();
node.test = parseParenExpression();
node.consequent = parseStatement();
node.alternate = eat(tt._else) ? parseStatement() : null;
return finishNode(node, "IfStatement");
case tt._return:
next();
if (eat(tt.semi) || canInsertSemicolon()) node.argument = null;
else { node.argument = parseExpression(); semicolon(); }
return finishNode(node, "ReturnStatement");
case tt._switch:
var blockIndent = curIndent, line = curLineStart;
next();
node.discriminant = parseParenExpression();
node.cases = [];
pushCx();
expect(tt.braceL);
for (var cur; !closes(tt.braceR, blockIndent, line, true);) {
if (token.type === tt._case || token.type === tt._default) {
var isCase = token.type === tt._case;
if (cur) finishNode(cur, "SwitchCase");
node.cases.push(cur = startNode());
cur.consequent = [];
next();
if (isCase) cur.test = parseExpression();
else cur.test = null;
expect(tt.colon);
} else {
if (!cur) {
node.cases.push(cur = startNode());
cur.consequent = [];
cur.test = null;
}
cur.consequent.push(parseStatement());
}
}
if (cur) finishNode(cur, "SwitchCase");
popCx();
eat(tt.braceR);
return finishNode(node, "SwitchStatement");
case tt._throw:
next();
node.argument = parseExpression();
semicolon();
return finishNode(node, "ThrowStatement");
case tt._try:
next();
node.block = parseBlock();
node.handler = null;
if (token.type === tt._catch) {
var clause = startNode();
next();
expect(tt.parenL);
clause.param = parseIdent();
expect(tt.parenR);
clause.guard = null;
clause.body = parseBlock();
node.handler = finishNode(clause, "CatchClause");
}
node.finalizer = eat(tt._finally) ? parseBlock() : null;
if (!node.handler && !node.finalizer) return node.block;
return finishNode(node, "TryStatement");
case tt._var:
case tt._let:
case tt._const:
return parseVar();
case tt._while:
next();
node.test = parseParenExpression();
node.body = parseStatement();
return finishNode(node, "WhileStatement");
case tt._with:
next();
node.object = parseParenExpression();
node.body = parseStatement();
return finishNode(node, "WithStatement");
case tt.braceL:
return parseBlock();
case tt.semi:
next();
return finishNode(node, "EmptyStatement");
case tt._class:
return parseObj(true, true);
case tt._import:
return parseImport();
case tt._export:
return parseExport();
default:
var expr = parseExpression();
if (isDummy(expr)) {
next();
if (token.type === tt.eof) return finishNode(node, "EmptyStatement");
return parseStatement();
} else if (starttype === tt.name && expr.type === "Identifier" && eat(tt.colon)) {
node.body = parseStatement();
node.label = expr;
return finishNode(node, "LabeledStatement");
} else {
node.expression = expr;
semicolon();
return finishNode(node, "ExpressionStatement");
}
}
}
function parseBlock() {
var node = startNode();
pushCx();
expect(tt.braceL);
var blockIndent = curIndent, line = curLineStart;
node.body = [];
while (!closes(tt.braceR, blockIndent, line, true))
node.body.push(parseStatement());
popCx();
eat(tt.braceR);
return finishNode(node, "BlockStatement");
}
function parseFor(node, init) {
node.init = init;
node.test = node.update = null;
if (eat(tt.semi) && token.type !== tt.semi) node.test = parseExpression();
if (eat(tt.semi) && token.type !== tt.parenR) node.update = parseExpression();
popCx();
expect(tt.parenR);
node.body = parseStatement();
return finishNode(node, "ForStatement");
}
function parseForIn(node, init) {
var type = token.type === tt._in ? "ForInStatement" : "ForOfStatement";
next();
node.left = init;
node.right = parseExpression();
popCx();
expect(tt.parenR);
node.body = parseStatement();
return finishNode(node, type);
}
function parseVar(noIn) {
var node = startNode();
node.kind = token.type.keyword;
next();
node.declarations = [];
do {
var decl = startNode();
decl.id = options.ecmaVersion >= 6 ? toAssignable(parseExprAtom()) : parseIdent();
decl.init = eat(tt.eq) ? parseExpression(true, noIn) : null;
node.declarations.push(finishNode(decl, "VariableDeclarator"));
} while (eat(tt.comma));
if (!node.declarations.length) {
var decl = startNode();
decl.id = dummyIdent();
node.declarations.push(finishNode(decl, "VariableDeclarator"));
}
if (!noIn) semicolon();
return finishNode(node, "VariableDeclaration");
}
function parseExpression(noComma, noIn) {
var start = storeCurrentPos();
var expr = parseMaybeAssign(noIn);
if (!noComma && token.type === tt.comma) {
var node = startNodeAt(start);
node.expressions = [expr];
while (eat(tt.comma)) node.expressions.push(parseMaybeAssign(noIn));
return finishNode(node, "SequenceExpression");
}
return expr;
}
function parseParenExpression() {
pushCx();
expect(tt.parenL);
var val = parseExpression();
popCx();
expect(tt.parenR);
return val;
}
function parseMaybeAssign(noIn) {
var start = storeCurrentPos();
var left = parseMaybeConditional(noIn);
if (token.type.isAssign) {
var node = startNodeAt(start);
node.operator = token.value;
node.left = token.type === tt.eq ? toAssignable(left) : checkLVal(left);
next();
node.right = parseMaybeAssign(noIn);
return finishNode(node, "AssignmentExpression");
}
return left;
}
function parseMaybeConditional(noIn) {
var start = storeCurrentPos();
var expr = parseExprOps(noIn);
if (eat(tt.question)) {
var node = startNodeAt(start);
node.test = expr;
node.consequent = parseExpression(true);
node.alternate = expect(tt.colon) ? parseExpression(true, noIn) : dummyIdent();
return finishNode(node, "ConditionalExpression");
}
return expr;
}
function parseExprOps(noIn) {
var start = storeCurrentPos();
var indent = curIndent, line = curLineStart;
return parseExprOp(parseMaybeUnary(noIn), start, -1, noIn, indent, line);
}
function parseExprOp(left, start, minPrec, noIn, indent, line) {
if (curLineStart != line && curIndent < indent && tokenStartsLine()) return left;
var prec = token.type.binop;
if (prec != null && (!noIn || token.type !== tt._in)) {
if (prec > minPrec) {
var node = startNodeAt(start);
node.left = left;
node.operator = token.value;
next();
if (curLineStart != line && curIndent < indent && tokenStartsLine()) {
node.right = dummyIdent();
} else {
var rightStart = storeCurrentPos();
node.right = parseExprOp(parseMaybeUnary(noIn), rightStart, prec, noIn, indent, line);
}
finishNode(node, /&&|\|\|/.test(node.operator) ? "LogicalExpression" : "BinaryExpression");
return parseExprOp(node, start, minPrec, noIn, indent, line);
}
}
return left;
}
function parseMaybeUnary(noIn) {
if (token.type.prefix) {
var node = startNode(), update = token.type.isUpdate, nodeType;
if (token.type === tt.ellipsis) {
nodeType = "SpreadElement";
} else {
nodeType = update ? "UpdateExpression" : "UnaryExpression";
node.operator = token.value;
node.prefix = true;
}
node.operator = token.value;
node.prefix = true;
next();
node.argument = parseMaybeUnary(noIn);
if (update) node.argument = checkLVal(node.argument);
return finishNode(node, nodeType);
}
var start = storeCurrentPos();
var expr = parseExprSubscripts();
while (token.type.postfix && !canInsertSemicolon()) {
var node = startNodeAt(start);
node.operator = token.value;
node.prefix = false;
node.argument = checkLVal(expr);
next();
expr = finishNode(node, "UpdateExpression");
}
return expr;
}
function parseExprSubscripts() {
var start = storeCurrentPos();
return parseSubscripts(parseExprAtom(), start, false, curIndent, curLineStart);
}
function parseSubscripts(base, start, noCalls, startIndent, line) {
for (;;) {
if (curLineStart != line && curIndent <= startIndent && tokenStartsLine()) {
if (token.type == tt.dot && curIndent == startIndent)
--startIndent;
else
return base;
}
if (eat(tt.dot)) {
var node = startNodeAt(start);
node.object = base;
if (curLineStart != line && curIndent <= startIndent && tokenStartsLine())
node.property = dummyIdent();
else
node.property = parsePropertyAccessor() || dummyIdent();
node.computed = false;
base = finishNode(node, "MemberExpression");
} else if (token.type == tt.bracketL) {
pushCx();
next();
var node = startNodeAt(start);
node.object = base;
node.property = parseExpression();
node.computed = true;
popCx();
expect(tt.bracketR);
base = finishNode(node, "MemberExpression");
} else if (!noCalls && token.type == tt.parenL) {
pushCx();
var node = startNodeAt(start);
node.callee = base;
node.arguments = parseExprList(tt.parenR);
base = finishNode(node, "CallExpression");
} else if (token.type == tt.template) {
var node = startNodeAt(start);
node.tag = base;
node.quasi = parseTemplate();
base = finishNode(node, "TaggedTemplateExpression");
} else {
return base;
}
}
}
function parseExprAtom() {
switch (token.type) {
case tt._this:
var node = startNode();
next();
return finishNode(node, "ThisExpression");
case tt.name:
var start = storeCurrentPos();
var id = parseIdent();
return eat(tt.arrow) ? parseArrowExpression(startNodeAt(start), [id]) : id;
case tt.regexp:
var node = startNode();
var val = token.value;
node.regex = {pattern: val.pattern, flags: val.flags};
node.value = val.value;
node.raw = input.slice(token.start, token.end);
next();
return finishNode(node, "Literal");
case tt.num: case tt.string:
var node = startNode();
node.value = token.value;
node.raw = input.slice(token.start, token.end);
next();
return finishNode(node, "Literal");
case tt._null: case tt._true: case tt._false:
var node = startNode();
node.value = token.type.atomValue;
node.raw = token.type.keyword;
next();
return finishNode(node, "Literal");
case tt.parenL:
var start = storeCurrentPos();
next();
var val = parseExpression();
expect(tt.parenR);
if (eat(tt.arrow)) {
return parseArrowExpression(startNodeAt(start), val.expressions || (isDummy(val) ? [] : [val]));
}
if (options.preserveParens) {
var par = startNodeAt(start);
par.expression = val;
val = finishNode(par, "ParenthesizedExpression");
}
return val;
case tt.bracketL:
var node = startNode();
pushCx();
node.elements = parseExprList(tt.bracketR, true);
return finishNode(node, "ArrayExpression");
case tt.braceL:
return parseObj();
case tt._class:
return parseObj(true);
case tt._function:
var node = startNode();
next();
return parseFunction(node, false);
case tt._new:
return parseNew();
case tt._yield:
var node = startNode();
next();
if (semicolon() || canInsertSemicolon()) {
node.delegate = false;
node.argument = null;
} else {
node.delegate = eat(tt.star);
node.argument = parseExpression(true);
}
return finishNode(node, "YieldExpression");
case tt.template:
return parseTemplate();
default:
return dummyIdent();
}
}
function parseNew() {
var node = startNode(), startIndent = curIndent, line = curLineStart;
next();
var start = storeCurrentPos();
node.callee = parseSubscripts(parseExprAtom(), start, true, startIndent, line);
if (token.type == tt.parenL) {
pushCx();
node.arguments = parseExprList(tt.parenR);
} else {
node.arguments = [];
}
return finishNode(node, "NewExpression");
}
function parseTemplateElement() {
var elem = startNodeAt(options.locations ? [token.start + 1, token.startLoc.offset(1)] : token.start + 1);
elem.value = token.value;
elem.tail = input.charCodeAt(token.end - 1) !== 123; // '{'
var endOff = elem.tail ? 1 : 2;
var endPos = options.locations ? [token.end - endOff, token.endLoc.offset(-endOff)] : token.end - endOff;
next();
return finishNodeAt(elem, "TemplateElement", endPos);
}
function parseTemplate() {
var node = startNode();
node.expressions = [];
var curElt = parseTemplateElement();
node.quasis = [curElt];
while (!curElt.tail) {
var next = parseExpression();
if (isDummy(next)) {
node.quasis[node.quasis.length - 1].tail = true;
break;
}
node.expressions.push(next);
if (token.type === tt.templateContinued) {
node.quasis.push(curElt = parseTemplateElement());
} else {
curElt = startNode();
curElt.value = {cooked: "", raw: ""};
curElt.tail = true;
node.quasis.push(curElt);
}
}
return finishNode(node, "TemplateLiteral");
}
function parseObj(isClass, isStatement) {
var node = startNode();
if (isClass) {
next();
if (token.type === tt.name) node.id = parseIdent();
else if (isStatement) node.id = dummyIdent();
node.superClass = eat(tt._extends) ? parseExpression() : null;
node.body = startNode();
node.body.body = [];
} else {
node.properties = [];
}
pushCx();
var indent = curIndent + 1, line = curLineStart;
eat(tt.braceL);
if (curIndent + 1 < indent) { indent = curIndent; line = curLineStart; }
while (!closes(tt.braceR, indent, line)) {
var prop = startNode(), isGenerator;
if (options.ecmaVersion >= 6) {
if (isClass) {
if (prop['static'] = (token.type === tt.name && token.value === "static")) next();
} else {
prop.method = false;
prop.shorthand = false;
}
isGenerator = eat(tt.star);
}
parsePropertyName(prop);
if (isDummy(prop.key)) { if (isDummy(parseExpression(true))) next(); eat(tt.comma); continue; }
if (!isClass && eat(tt.colon)) {
prop.kind = "init";
prop.value = parseExpression(true);
} else if (options.ecmaVersion >= 6 && (token.type === tt.parenL || token.type === tt.braceL)) {
if (isClass) {
prop.kind = "";
} else {
prop.kind = "init";
prop.method = true;
}
prop.value = parseMethod(isGenerator);
} else if (options.ecmaVersion >= 5 && prop.key.type === "Identifier" &&
(prop.key.name === "get" || prop.key.name === "set") &&
(token.type != tt.comma && token.type != tt.braceR)) {
prop.kind = prop.key.name;
parsePropertyName(prop);
prop.value = parseMethod(false);
} else if (isClass) {
prop.kind = "";
prop.value = parseMethod(isGenerator);
} else {
prop.kind = "init";
prop.value = options.ecmaVersion >= 6 ? prop.key : dummyIdent();
prop.shorthand = true;
}
if (isClass) {
node.body.body.push(finishNode(prop, "MethodDefinition"));
semicolon();
} else {
node.properties.push(finishNode(prop, "Property"));
eat(tt.comma);
}
}
popCx();
if (!eat(tt.braceR)) {
// If there is no closing brace, make the node span to the start
// of the next token (this is useful for Tern)
lastEnd = token.start;
if (options.locations) lastEndLoc = token.startLoc;
}
if (isClass) {
semicolon();
finishNode(node.body, "ClassBody");
return finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression");
} else {
return finishNode(node, "ObjectExpression");
}
}
function parsePropertyName(prop) {
if (options.ecmaVersion >= 6) {
if (eat(tt.bracketL)) {
prop.computed = true;
prop.key = parseExpression();
expect(tt.bracketR);
return;
} else {
prop.computed = false;
}
}
var key = (token.type === tt.num || token.type === tt.string) ? parseExprAtom() : parseIdent();
prop.key = key || dummyIdent();
}
function parsePropertyAccessor() {
if (token.type === tt.name || token.type.keyword) return parseIdent();
}
function parseIdent() {
var node = startNode();
node.name = token.type === tt.name ? token.value : token.type.keyword;
next();
return finishNode(node, "Identifier");
}
function initFunction(node) {
node.id = null;
node.params = [];
if (options.ecmaVersion >= 6) {
node.defaults = [];
node.rest = null;
node.generator = false;
node.expression = false;
}
}
// Convert existing expression atom to assignable pattern
// if possible.
function toAssignable(node) {
if (options.ecmaVersion >= 6 && node) {
switch (node.type) {
case "ObjectExpression":
node.type = "ObjectPattern";
var props = node.properties;
for (var i = 0; i < props.length; i++) {
props[i].value = toAssignable(props[i].value);
}
break;
case "ArrayExpression":
node.type = "ArrayPattern";
var elms = node.elements;
for (var i = 0; i < elms.length; i++) {
elms[i] = toAssignable(elms[i]);
}
break;
case "SpreadElement":
node.argument = toAssignable(node.argument);
break;
case "AssignmentExpression":
if (node.operator === "=")
node.type = "AssignmentPattern";
break;
}
}
return checkLVal(node);
}
function parseFunctionParams(node, params) {
var defaults = [], hasDefaults = false;
if (!params) {
pushCx();
params = parseExprList(tt.parenR);
}
for (var i = 0; i < params.length; i++) {
var param = params[i], defValue = null;
if (param.type === "AssignmentExpression") {
defValue = param.right;
param = param.left;
}
param = toAssignable(param);
if (param.type === "SpreadElement") {
param = param.argument;
if (i === params.length - 1) {
node.rest = param;
continue;
}
}
node.params.push(param);
defaults.push(defValue);
if (defValue) hasDefaults = true;
}
if (hasDefaults) node.defaults = defaults;
}
function parseFunction(node, isStatement) {
initFunction(node);
if (options.ecmaVersion >= 6) {
node.generator = eat(tt.star);
}
if (token.type === tt.name) node.id = parseIdent();
else if (isStatement) node.id = dummyIdent();
parseFunctionParams(node);
node.body = parseBlock();
return finishNode(node, isStatement ? "FunctionDeclaration" : "FunctionExpression");
}
function parseMethod(isGenerator) {
var node = startNode();
initFunction(node);
parseFunctionParams(node);
node.generator = isGenerator || false;
node.expression = options.ecmaVersion >= 6 && token.type !== tt.braceL;
node.body = node.expression ? parseExpression(true) : parseBlock();
return finishNode(node, "FunctionExpression");
}
function parseArrowExpression(node, params) {
initFunction(node);
parseFunctionParams(node, params);
node.expression = token.type !== tt.braceL;
node.body = node.expression ? parseExpression(true) : parseBlock();
return finishNode(node, "ArrowFunctionExpression");
}
function parseExport() {
var node = startNode();
next();
node['default'] = eat(tt._default);
node.specifiers = node.source = null;
if (node['default']) {
node.declaration = parseExpression();
semicolon();
} else if (token.type.keyword) {
node.declaration = parseStatement();
} else {
node.declaration = null;
parseSpecifierList(node, "Export");
}
semicolon();
return finishNode(node, "ExportDeclaration");
}
function parseImport() {
var node = startNode();
next();
if (token.type === tt.string) {
node.specifiers = [];
node.source = parseExprAtom();
node.kind = '';
} else {
if (token.type === tt.name && token.value !== "from") {
var elt = startNode();
elt.id = parseIdent();
elt.name = null;
elt['default'] = true;
finishNode(elt, "ImportSpecifier");
eat(tt.comma);
}
parseSpecifierList(node, "Import");
var specs = node.specifiers;
for (var i = 0; i < specs.length; i++) specs[i]['default'] = false;
if (elt) node.specifiers.unshift(elt);
}
semicolon();
return finishNode(node, "ImportDeclaration");
}
function parseSpecifierList(node, prefix) {
var elts = node.specifiers = [];
if (token.type === tt.star) {
var elt = startNode();
next();
if (token.type === tt.name && token.value === "as") {
next();
elt.name = parseIdent();
}
elts.push(finishNode(elt, prefix + "BatchSpecifier"));
} else {
var indent = curIndent, line = curLineStart, continuedLine = nextLineStart;
pushCx();
eat(tt.braceL);
if (curLineStart > continuedLine) continuedLine = curLineStart;
while (!closes(tt.braceR, indent + (curLineStart <= continuedLine ? 1 : 0), line)) {
var elt = startNode();
if (token.type === tt.star) {
next();
if (token.type === tt.name && token.value === "as") {
next();
elt.name = parseIdent();
}
finishNode(elt, prefix + "BatchSpecifier");
} else {
if (token.type === tt.name && token.value === "from") break;
elt.id = parseIdent();
if (token.type === tt.name && token.value === "as") {
next();
elt.name = parseIdent();
} else {
elt.name = null;
}
finishNode(elt, prefix + "Specifier");
}
elts.push(elt);
eat(tt.comma);
}
eat(tt.braceR);
popCx();
}
if (token.type === tt.name && token.value === "from") {
next();
node.source = parseExprAtom();
} else {
node.source = null;
}
}
function parseExprList(close, allowEmpty) {
var indent = curIndent, line = curLineStart, elts = [];
next(); // Opening bracket
while (!closes(close, indent + 1, line)) {
if (eat(tt.comma)) {
elts.push(allowEmpty ? null : dummyIdent());
continue;
}
var elt = parseExpression(true);
if (isDummy(elt)) {
if (closes(close, indent, line)) break;
next();
} else {
elts.push(elt);
}
eat(tt.comma);
}
popCx();
if (!eat(close)) {
// If there is no closing brace, make the node span to the start
// of the next token (this is useful for Tern)
lastEnd = token.start;
if (options.locations) lastEndLoc = token.startLoc;
}
return elts;
}
});