1197 lines
40 KiB
JavaScript
1197 lines
40 KiB
JavaScript
// Acorn: Loose parser
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//
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// This module provides an alternative parser (`parse_dammit`) that
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// exposes that same interface as `parse`, but will try to parse
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// anything as JavaScript, repairing syntax error the best it can.
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// There are circumstances in which it will raise an error and give
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// up, but they are very rare. The resulting AST will be a mostly
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// valid JavaScript AST (as per the [Mozilla parser API][api], except
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// that:
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//
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// - Return outside functions is allowed
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//
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// - Label consistency (no conflicts, break only to existing labels)
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// is not enforced.
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//
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// - Bogus Identifier nodes with a name of `"✖"` are inserted whenever
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// the parser got too confused to return anything meaningful.
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//
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// [api]: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API
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//
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// The expected use for this is to *first* try `acorn.parse`, and only
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// if that fails switch to `parse_dammit`. The loose parser might
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// parse badly indented code incorrectly, so **don't** use it as
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// your default parser.
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//
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// Quite a lot of acorn.js is duplicated here. The alternative was to
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// add a *lot* of extra cruft to that file, making it less readable
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// and slower. Copying and editing the code allowed me to make
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// invasive changes and simplifications without creating a complicated
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// tangle.
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(function(root, mod) {
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if (typeof exports == "object" && typeof module == "object") return mod(exports, require("./acorn")); // CommonJS
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if (typeof define == "function" && define.amd) return define(["exports", "./acorn"], mod); // AMD
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mod(root.acorn || (root.acorn = {}), root.acorn); // Plain browser env
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})(this, function(exports, acorn) {
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"use strict";
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var tt = acorn.tokTypes;
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acorn.defaultOptions.tabSize = 4;
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exports.parse_dammit = function(input, options) {
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var p = new LooseParser(input, options);
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p.next();
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return p.parseTopLevel();
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};
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var LooseParser = exports.LooseParser = function(input, options) {
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this.toks = acorn.tokenizer(input, options)
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this.options = this.toks.options;
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this.input = this.toks.input;
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this.tok = this.last = {type: tt.eof, start: 0, end: 0};
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if (this.options.locations) {
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var here = this.toks.curPosition();
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this.tok.loc = new acorn.SourceLocation(this.toks, here, here);
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}
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this.ahead = []; // Tokens ahead
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this.context = []; // Indentation contexted
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this.curIndent = 0;
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this.curLineStart = 0;
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this.nextLineStart = this.lineEnd(this.curLineStart) + 1;
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};
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var lp = LooseParser.prototype;
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lp.next = function() {
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this.last = this.tok;
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if (this.ahead.length)
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this.tok = this.ahead.shift();
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else
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this.tok = this.readToken();
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if (this.tok.start >= this.nextLineStart) {
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while (this.tok.start >= this.nextLineStart) {
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this.curLineStart = this.nextLineStart;
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this.nextLineStart = this.lineEnd(this.curLineStart) + 1;
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}
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this.curIndent = this.indentationAfter(this.curLineStart);
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}
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};
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lp.readToken = function() {
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for (;;) {
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try {
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this.toks.next();
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if (this.toks.type === tt.dot &&
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this.input.substr(this.toks.end, 1) === "." &&
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this.options.ecmaVersion >= 6) {
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this.toks.end++;
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this.toks.type = tt.ellipsis;
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}
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return new acorn.Token(this.toks);
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} catch(e) {
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if (!(e instanceof SyntaxError)) throw e;
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// Try to skip some text, based on the error message, and then continue
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var msg = e.message, pos = e.raisedAt, replace = true;
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if (/unterminated/i.test(msg)) {
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pos = this.lineEnd(e.pos + 1);
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if (/string/.test(msg)) {
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replace = {start: e.pos, end: pos, type: tt.string, value: this.input.slice(e.pos + 1, pos)};
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} else if (/regular expr/i.test(msg)) {
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var re = this.input.slice(e.pos, pos);
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try { re = new RegExp(re); } catch(e) {}
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replace = {start: e.pos, end: pos, type: tt.regexp, value: re};
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} else if (/template/.test(msg)) {
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replace = {start: e.pos, end: pos,
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type: tt.template,
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value: this.input.slice(e.pos, pos)};
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} else {
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replace = false;
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}
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} else if (/invalid (unicode|regexp|number)|expecting unicode|octal literal|is reserved|directly after number/i.test(msg)) {
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while (pos < this.input.length && !isSpace(this.input.charCodeAt(pos))) ++pos;
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} else if (/character escape|expected hexadecimal/i.test(msg)) {
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while (pos < this.input.length) {
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var ch = this.input.charCodeAt(pos++);
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if (ch === 34 || ch === 39 || acorn.isNewLine(ch)) break;
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}
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} else if (/unexpected character/i.test(msg)) {
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pos++;
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replace = false;
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} else if (/regular expression/i.test(msg)) {
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replace = true;
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} else {
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throw e;
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}
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this.resetTo(pos);
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if (replace === true) replace = {start: pos, end: pos, type: tt.name, value: "✖"};
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if (replace) {
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if (this.options.locations)
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replace.loc = new acorn.SourceLocation(
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this.toks,
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acorn.getLineInfo(this.input, replace.start),
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acorn.getLineInfo(this.input, replace.end));
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return replace;
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}
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}
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}
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};
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lp.resetTo = function(pos) {
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this.toks.pos = pos;
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var ch = this.input.charAt(pos - 1);
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this.toks.exprAllowed = !ch || /[\[\{\(,;:?\/*=+\-~!|&%^<>]/.test(ch) ||
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/[enwfd]/.test(ch) &&
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/\b(keywords|case|else|return|throw|new|in|(instance|type)of|delete|void)$/.test(this.input.slice(pos - 10, pos));
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if (this.options.locations) {
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this.toks.curLine = 1;
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this.toks.lineStart = acorn.lineBreakG.lastIndex = 0;
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var match;
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while ((match = acorn.lineBreakG.exec(this.input)) && match.index < pos) {
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++this.toks.curLine;
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this.toks.lineStart = match.index + match[0].length;
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}
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}
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};
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lp.lookAhead = function(n) {
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while (n > this.ahead.length)
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this.ahead.push(this.readToken());
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return this.ahead[n - 1];
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};
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function isSpace(ch) {
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return (ch < 14 && ch > 8) || ch === 32 || ch === 160 || acorn.isNewLine(ch);
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}
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lp.pushCx = function() {
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this.context.push(this.curIndent);
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};
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lp.popCx = function() {
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this.curIndent = this.context.pop();
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};
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lp.lineEnd = function(pos) {
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while (pos < this.input.length && !acorn.isNewLine(this.input.charCodeAt(pos))) ++pos;
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return pos;
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};
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lp.indentationAfter = function(pos) {
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for (var count = 0;; ++pos) {
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var ch = this.input.charCodeAt(pos);
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if (ch === 32) ++count;
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else if (ch === 9) count += this.options.tabSize;
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else return count;
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}
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};
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lp.closes = function(closeTok, indent, line, blockHeuristic) {
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if (this.tok.type === closeTok || this.tok.type === tt.eof) return true;
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return line != this.curLineStart && this.curIndent < indent && this.tokenStartsLine() &&
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(!blockHeuristic || this.nextLineStart >= this.input.length ||
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this.indentationAfter(this.nextLineStart) < indent);
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};
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lp.tokenStartsLine = function() {
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for (var p = this.tok.start - 1; p >= this.curLineStart; --p) {
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var ch = this.input.charCodeAt(p);
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if (ch !== 9 && ch !== 32) return false;
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}
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return true;
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};
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lp.startNode = function() {
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var node = new acorn.Node;
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node.start = this.tok.start;
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if (this.options.locations)
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node.loc = new acorn.SourceLocation(this.toks, this.tok.loc.start);
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if (this.options.directSourceFile)
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node.sourceFile = this.options.directSourceFile;
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if (this.options.ranges)
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node.range = [this.tok.start, 0];
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return node;
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};
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lp.storeCurrentPos = function() {
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return this.options.locations ? [this.tok.start, this.tok.loc.start] : this.tok.start;
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};
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lp.startNodeAt = function(pos) {
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var node = new acorn.Node;
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if (this.options.locations) {
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node.start = pos[0];
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node.loc = new acorn.SourceLocation(this.toks, pos[1]);
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pos = pos[0];
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} else {
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node.start = pos;
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}
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if (this.options.directSourceFile)
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node.sourceFile = this.options.directSourceFile;
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if (this.options.ranges)
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node.range = [pos, 0];
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return node;
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};
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lp.finishNode = function(node, type) {
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node.type = type;
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node.end = this.last.end;
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if (this.options.locations)
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node.loc.end = this.last.loc.end;
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if (this.options.ranges)
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node.range[1] = this.last.end;
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return node;
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};
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lp.dummyIdent = function() {
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var dummy = this.startNode();
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dummy.name = "✖";
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return this.finishNode(dummy, "Identifier");
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};
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function isDummy(node) { return node.name == "✖"; }
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lp.eat = function(type) {
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if (this.tok.type === type) {
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this.next();
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return true;
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} else {
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return false;
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}
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};
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lp.isContextual = function(name) {
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return this.tok.type === tt.name && this.tok.value === name;
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};
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lp.eatContextual = function(name) {
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return this.tok.value === name && this.eat(tt.name);
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};
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lp.canInsertSemicolon = function() {
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return this.tok.type === tt.eof || this.tok.type === tt.braceR ||
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acorn.lineBreak.test(this.input.slice(this.last.end, this.tok.start));
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};
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lp.semicolon = function() {
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return this.eat(tt.semi);
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};
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lp.expect = function(type) {
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if (this.eat(type)) return true;
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for (var i = 1; i <= 2; i++) {
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if (this.lookAhead(i).type == type) {
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for (var j = 0; j < i; j++) this.next();
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return true;
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}
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}
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};
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lp.checkLVal = function(expr) {
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if (!expr) return expr;
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switch (expr.type) {
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case "Identifier":
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case "MemberExpression":
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case "ObjectPattern":
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case "ArrayPattern":
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case "RestElement":
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case "AssignmentPattern":
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return expr;
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default:
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return this.dummyIdent();
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}
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};
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lp.parseTopLevel = function() {
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var node = this.startNodeAt(this.options.locations ? [0, acorn.getLineInfo(this.input, 0)] : 0);
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node.body = [];
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while (this.tok.type !== tt.eof) node.body.push(this.parseStatement());
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this.last = this.tok;
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if (this.options.ecmaVersion >= 6) {
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node.sourceType = this.options.sourceType;
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}
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return this.finishNode(node, "Program");
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};
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lp.parseStatement = function() {
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var starttype = this.tok.type, node = this.startNode();
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switch (starttype) {
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case tt._break: case tt._continue:
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this.next();
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var isBreak = starttype === tt._break;
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if (this.semicolon() || this.canInsertSemicolon()) {
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node.label = null;
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} else {
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node.label = this.tok.type === tt.name ? this.parseIdent() : null;
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this.semicolon();
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}
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return this.finishNode(node, isBreak ? "BreakStatement" : "ContinueStatement");
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case tt._debugger:
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this.next();
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this.semicolon();
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return this.finishNode(node, "DebuggerStatement");
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case tt._do:
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this.next();
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node.body = this.parseStatement();
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node.test = this.eat(tt._while) ? this.parseParenExpression() : this.dummyIdent();
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this.semicolon();
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return this.finishNode(node, "DoWhileStatement");
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case tt._for:
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this.next();
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this.pushCx();
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this.expect(tt.parenL);
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if (this.tok.type === tt.semi) return this.parseFor(node, null);
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if (this.tok.type === tt._var || this.tok.type === tt._let || this.tok.type === tt._const) {
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var init = this.parseVar(true);
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if (init.declarations.length === 1 && (this.tok.type === tt._in || this.isContextual("of"))) {
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return this.parseForIn(node, init);
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}
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return this.parseFor(node, init);
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}
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var init = this.parseExpression(true);
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if (this.tok.type === tt._in || this.isContextual("of"))
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return this.parseForIn(node, this.toAssignable(init));
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return this.parseFor(node, init);
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case tt._function:
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this.next();
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return this.parseFunction(node, true);
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case tt._if:
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this.next();
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node.test = this.parseParenExpression();
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node.consequent = this.parseStatement();
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node.alternate = this.eat(tt._else) ? this.parseStatement() : null;
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return this.finishNode(node, "IfStatement");
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case tt._return:
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this.next();
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if (this.eat(tt.semi) || this.canInsertSemicolon()) node.argument = null;
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else { node.argument = this.parseExpression(); this.semicolon(); }
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return this.finishNode(node, "ReturnStatement");
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case tt._switch:
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var blockIndent = this.curIndent, line = this.curLineStart;
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this.next();
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node.discriminant = this.parseParenExpression();
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node.cases = [];
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this.pushCx();
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this.expect(tt.braceL);
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for (var cur; !this.closes(tt.braceR, blockIndent, line, true);) {
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if (this.tok.type === tt._case || this.tok.type === tt._default) {
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var isCase = this.tok.type === tt._case;
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if (cur) this.finishNode(cur, "SwitchCase");
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node.cases.push(cur = this.startNode());
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cur.consequent = [];
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this.next();
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if (isCase) cur.test = this.parseExpression();
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else cur.test = null;
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this.expect(tt.colon);
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} else {
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if (!cur) {
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node.cases.push(cur = this.startNode());
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cur.consequent = [];
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cur.test = null;
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}
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cur.consequent.push(this.parseStatement());
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}
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}
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if (cur) this.finishNode(cur, "SwitchCase");
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this.popCx();
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this.eat(tt.braceR);
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return this.finishNode(node, "SwitchStatement");
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|
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case tt._throw:
|
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this.next();
|
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node.argument = this.parseExpression();
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this.semicolon();
|
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return this.finishNode(node, "ThrowStatement");
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|
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case tt._try:
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this.next();
|
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node.block = this.parseBlock();
|
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node.handler = null;
|
|
if (this.tok.type === tt._catch) {
|
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var clause = this.startNode();
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this.next();
|
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this.expect(tt.parenL);
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clause.param = this.toAssignable(this.parseExprAtom());
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this.expect(tt.parenR);
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clause.guard = null;
|
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clause.body = this.parseBlock();
|
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node.handler = this.finishNode(clause, "CatchClause");
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}
|
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node.finalizer = this.eat(tt._finally) ? this.parseBlock() : null;
|
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if (!node.handler && !node.finalizer) return node.block;
|
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return this.finishNode(node, "TryStatement");
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|
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case tt._var:
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case tt._let:
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case tt._const:
|
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return this.parseVar();
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|
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case tt._while:
|
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this.next();
|
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node.test = this.parseParenExpression();
|
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node.body = this.parseStatement();
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return this.finishNode(node, "WhileStatement");
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|
|
case tt._with:
|
|
this.next();
|
|
node.object = this.parseParenExpression();
|
|
node.body = this.parseStatement();
|
|
return this.finishNode(node, "WithStatement");
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|
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case tt.braceL:
|
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return this.parseBlock();
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|
|
case tt.semi:
|
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this.next();
|
|
return this.finishNode(node, "EmptyStatement");
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|
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case tt._class:
|
|
return this.parseClass(true);
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|
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case tt._import:
|
|
return this.parseImport();
|
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|
|
case tt._export:
|
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return this.parseExport();
|
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|
|
default:
|
|
var expr = this.parseExpression();
|
|
if (isDummy(expr)) {
|
|
this.next();
|
|
if (this.tok.type === tt.eof) return this.finishNode(node, "EmptyStatement");
|
|
return this.parseStatement();
|
|
} else if (starttype === tt.name && expr.type === "Identifier" && this.eat(tt.colon)) {
|
|
node.body = this.parseStatement();
|
|
node.label = expr;
|
|
return this.finishNode(node, "LabeledStatement");
|
|
} else {
|
|
node.expression = expr;
|
|
this.semicolon();
|
|
return this.finishNode(node, "ExpressionStatement");
|
|
}
|
|
}
|
|
};
|
|
|
|
lp.parseBlock = function() {
|
|
var node = this.startNode();
|
|
this.pushCx();
|
|
this.expect(tt.braceL);
|
|
var blockIndent = this.curIndent, line = this.curLineStart;
|
|
node.body = [];
|
|
while (!this.closes(tt.braceR, blockIndent, line, true))
|
|
node.body.push(this.parseStatement());
|
|
this.popCx();
|
|
this.eat(tt.braceR);
|
|
return this.finishNode(node, "BlockStatement");
|
|
};
|
|
|
|
lp.parseFor = function(node, init) {
|
|
node.init = init;
|
|
node.test = node.update = null;
|
|
if (this.eat(tt.semi) && this.tok.type !== tt.semi) node.test = this.parseExpression();
|
|
if (this.eat(tt.semi) && this.tok.type !== tt.parenR) node.update = this.parseExpression();
|
|
this.popCx();
|
|
this.expect(tt.parenR);
|
|
node.body = this.parseStatement();
|
|
return this.finishNode(node, "ForStatement");
|
|
};
|
|
|
|
lp.parseForIn = function(node, init) {
|
|
var type = this.tok.type === tt._in ? "ForInStatement" : "ForOfStatement";
|
|
this.next();
|
|
node.left = init;
|
|
node.right = this.parseExpression();
|
|
this.popCx();
|
|
this.expect(tt.parenR);
|
|
node.body = this.parseStatement();
|
|
return this.finishNode(node, type);
|
|
};
|
|
|
|
lp.parseVar = function(noIn) {
|
|
var node = this.startNode();
|
|
node.kind = this.tok.type.keyword;
|
|
this.next();
|
|
node.declarations = [];
|
|
do {
|
|
var decl = this.startNode();
|
|
decl.id = this.options.ecmaVersion >= 6 ? this.toAssignable(this.parseExprAtom()) : this.parseIdent();
|
|
decl.init = this.eat(tt.eq) ? this.parseMaybeAssign(noIn) : null;
|
|
node.declarations.push(this.finishNode(decl, "VariableDeclarator"));
|
|
} while (this.eat(tt.comma));
|
|
if (!node.declarations.length) {
|
|
var decl = this.startNode();
|
|
decl.id = this.dummyIdent();
|
|
node.declarations.push(this.finishNode(decl, "VariableDeclarator"));
|
|
}
|
|
if (!noIn) this.semicolon();
|
|
return this.finishNode(node, "VariableDeclaration");
|
|
};
|
|
|
|
lp.parseExpression = function(noIn) {
|
|
var start = this.storeCurrentPos();
|
|
var expr = this.parseMaybeAssign(noIn);
|
|
if (this.tok.type === tt.comma) {
|
|
var node = this.startNodeAt(start);
|
|
node.expressions = [expr];
|
|
while (this.eat(tt.comma)) node.expressions.push(this.parseMaybeAssign(noIn));
|
|
return this.finishNode(node, "SequenceExpression");
|
|
}
|
|
return expr;
|
|
};
|
|
|
|
lp.parseParenExpression = function() {
|
|
this.pushCx();
|
|
this.expect(tt.parenL);
|
|
var val = this.parseExpression();
|
|
this.popCx();
|
|
this.expect(tt.parenR);
|
|
return val;
|
|
};
|
|
|
|
lp.parseMaybeAssign = function(noIn) {
|
|
var start = this.storeCurrentPos();
|
|
var left = this.parseMaybeConditional(noIn);
|
|
if (this.tok.type.isAssign) {
|
|
var node = this.startNodeAt(start);
|
|
node.operator = this.tok.value;
|
|
node.left = this.tok.type === tt.eq ? this.toAssignable(left) : this.checkLVal(left);
|
|
this.next();
|
|
node.right = this.parseMaybeAssign(noIn);
|
|
return this.finishNode(node, "AssignmentExpression");
|
|
}
|
|
return left;
|
|
};
|
|
|
|
lp.parseMaybeConditional = function(noIn) {
|
|
var start = this.storeCurrentPos();
|
|
var expr = this.parseExprOps(noIn);
|
|
if (this.eat(tt.question)) {
|
|
var node = this.startNodeAt(start);
|
|
node.test = expr;
|
|
node.consequent = this.parseMaybeAssign();
|
|
node.alternate = this.expect(tt.colon) ? this.parseMaybeAssign(noIn) : this.dummyIdent();
|
|
return this.finishNode(node, "ConditionalExpression");
|
|
}
|
|
return expr;
|
|
};
|
|
|
|
lp.parseExprOps = function(noIn) {
|
|
var start = this.storeCurrentPos();
|
|
var indent = this.curIndent, line = this.curLineStart;
|
|
return this.parseExprOp(this.parseMaybeUnary(noIn), start, -1, noIn, indent, line);
|
|
};
|
|
|
|
lp.parseExprOp = function(left, start, minPrec, noIn, indent, line) {
|
|
if (this.curLineStart != line && this.curIndent < indent && this.tokenStartsLine()) return left;
|
|
var prec = this.tok.type.binop;
|
|
if (prec != null && (!noIn || this.tok.type !== tt._in)) {
|
|
if (prec > minPrec) {
|
|
var node = this.startNodeAt(start);
|
|
node.left = left;
|
|
node.operator = this.tok.value;
|
|
this.next();
|
|
if (this.curLineStart != line && this.curIndent < indent && this.tokenStartsLine()) {
|
|
node.right = this.dummyIdent();
|
|
} else {
|
|
var rightStart = this.storeCurrentPos();
|
|
node.right = this.parseExprOp(this.parseMaybeUnary(noIn), rightStart, prec, noIn, indent, line);
|
|
}
|
|
this.finishNode(node, /&&|\|\|/.test(node.operator) ? "LogicalExpression" : "BinaryExpression");
|
|
return this.parseExprOp(node, start, minPrec, noIn, indent, line);
|
|
}
|
|
}
|
|
return left;
|
|
};
|
|
|
|
lp.parseMaybeUnary = function(noIn) {
|
|
if (this.tok.type.prefix) {
|
|
var node = this.startNode(), update = this.tok.type === tt.incDec;
|
|
node.operator = this.tok.value;
|
|
node.prefix = true;
|
|
this.next();
|
|
node.argument = this.parseMaybeUnary(noIn);
|
|
if (update) node.argument = this.checkLVal(node.argument);
|
|
return this.finishNode(node, update ? "UpdateExpression" : "UnaryExpression");
|
|
} else if (this.tok.type === tt.ellipsis) {
|
|
var node = this.startNode();
|
|
this.next();
|
|
node.argument = this.parseMaybeUnary(noIn);
|
|
return this.finishNode(node, "SpreadElement");
|
|
}
|
|
var start = this.storeCurrentPos();
|
|
var expr = this.parseExprSubscripts();
|
|
while (this.tok.type.postfix && !this.canInsertSemicolon()) {
|
|
var node = this.startNodeAt(start);
|
|
node.operator = this.tok.value;
|
|
node.prefix = false;
|
|
node.argument = this.checkLVal(expr);
|
|
this.next();
|
|
expr = this.finishNode(node, "UpdateExpression");
|
|
}
|
|
return expr;
|
|
};
|
|
|
|
lp.parseExprSubscripts = function() {
|
|
var start = this.storeCurrentPos();
|
|
return this.parseSubscripts(this.parseExprAtom(), start, false, this.curIndent, this.curLineStart);
|
|
};
|
|
|
|
lp.parseSubscripts = function(base, start, noCalls, startIndent, line) {
|
|
for (;;) {
|
|
if (this.curLineStart != line && this.curIndent <= startIndent && this.tokenStartsLine()) {
|
|
if (this.tok.type == tt.dot && this.curIndent == startIndent)
|
|
--startIndent;
|
|
else
|
|
return base;
|
|
}
|
|
|
|
if (this.eat(tt.dot)) {
|
|
var node = this.startNodeAt(start);
|
|
node.object = base;
|
|
if (this.curLineStart != line && this.curIndent <= startIndent && this.tokenStartsLine())
|
|
node.property = this.dummyIdent();
|
|
else
|
|
node.property = this.parsePropertyAccessor() || this.dummyIdent();
|
|
node.computed = false;
|
|
base = this.finishNode(node, "MemberExpression");
|
|
} else if (this.tok.type == tt.bracketL) {
|
|
this.pushCx();
|
|
this.next();
|
|
var node = this.startNodeAt(start);
|
|
node.object = base;
|
|
node.property = this.parseExpression();
|
|
node.computed = true;
|
|
this.popCx();
|
|
this.expect(tt.bracketR);
|
|
base = this.finishNode(node, "MemberExpression");
|
|
} else if (!noCalls && this.tok.type == tt.parenL) {
|
|
this.pushCx();
|
|
var node = this.startNodeAt(start);
|
|
node.callee = base;
|
|
node.arguments = this.parseExprList(tt.parenR);
|
|
base = this.finishNode(node, "CallExpression");
|
|
} else if (this.tok.type == tt.backQuote) {
|
|
var node = this.startNodeAt(start);
|
|
node.tag = base;
|
|
node.quasi = this.parseTemplate();
|
|
base = this.finishNode(node, "TaggedTemplateExpression");
|
|
} else {
|
|
return base;
|
|
}
|
|
}
|
|
};
|
|
|
|
lp.parseExprAtom = function() {
|
|
switch (this.tok.type) {
|
|
case tt._this:
|
|
case tt._super:
|
|
var type = this.tok.type === tt._this ? "ThisExpression" : "SuperExpression";
|
|
var node = this.startNode();
|
|
this.next();
|
|
return this.finishNode(node, type);
|
|
|
|
case tt.name:
|
|
var start = this.storeCurrentPos();
|
|
var id = this.parseIdent();
|
|
return this.eat(tt.arrow) ? this.parseArrowExpression(this.startNodeAt(start), [id]) : id;
|
|
|
|
case tt.regexp:
|
|
var node = this.startNode();
|
|
var val = this.tok.value;
|
|
node.regex = {pattern: val.pattern, flags: val.flags};
|
|
node.value = val.value;
|
|
node.raw = this.input.slice(this.tok.start, this.tok.end);
|
|
this.next();
|
|
return this.finishNode(node, "Literal");
|
|
|
|
case tt.num: case tt.string:
|
|
var node = this.startNode();
|
|
node.value = this.tok.value;
|
|
node.raw = this.input.slice(this.tok.start, this.tok.end);
|
|
this.next();
|
|
return this.finishNode(node, "Literal");
|
|
|
|
case tt._null: case tt._true: case tt._false:
|
|
var node = this.startNode();
|
|
node.value = this.tok.type === tt._null ? null : this.tok.type === tt._true;
|
|
node.raw = this.tok.type.keyword;
|
|
this.next();
|
|
return this.finishNode(node, "Literal");
|
|
|
|
case tt.parenL:
|
|
var start = this.storeCurrentPos();
|
|
this.next();
|
|
var val = this.parseExpression();
|
|
this.expect(tt.parenR);
|
|
if (this.eat(tt.arrow)) {
|
|
return this.parseArrowExpression(this.startNodeAt(start), val.expressions || (isDummy(val) ? [] : [val]));
|
|
}
|
|
if (this.options.preserveParens) {
|
|
var par = this.startNodeAt(start);
|
|
par.expression = val;
|
|
val = this.finishNode(par, "ParenthesizedExpression");
|
|
}
|
|
return val;
|
|
|
|
case tt.bracketL:
|
|
var node = this.startNode();
|
|
this.pushCx();
|
|
node.elements = this.parseExprList(tt.bracketR, true);
|
|
return this.finishNode(node, "ArrayExpression");
|
|
|
|
case tt.braceL:
|
|
return this.parseObj();
|
|
|
|
case tt._class:
|
|
return this.parseClass();
|
|
|
|
case tt._function:
|
|
var node = this.startNode();
|
|
this.next();
|
|
return this.parseFunction(node, false);
|
|
|
|
case tt._new:
|
|
return this.parseNew();
|
|
|
|
case tt._yield:
|
|
var node = this.startNode();
|
|
this.next();
|
|
if (this.semicolon() || this.canInsertSemicolon() || (this.tok.type != tt.star && !this.tok.type.startsExpr)) {
|
|
node.delegate = false;
|
|
node.argument = null;
|
|
} else {
|
|
node.delegate = this.eat(tt.star);
|
|
node.argument = this.parseMaybeAssign();
|
|
}
|
|
return this.finishNode(node, "YieldExpression");
|
|
|
|
case tt.backQuote:
|
|
return this.parseTemplate();
|
|
|
|
default:
|
|
return this.dummyIdent();
|
|
}
|
|
};
|
|
|
|
lp.parseNew = function() {
|
|
var node = this.startNode(), startIndent = this.curIndent, line = this.curLineStart;
|
|
this.next();
|
|
var start = this.storeCurrentPos();
|
|
node.callee = this.parseSubscripts(this.parseExprAtom(), start, true, startIndent, line);
|
|
if (this.tok.type == tt.parenL) {
|
|
this.pushCx();
|
|
node.arguments = this.parseExprList(tt.parenR);
|
|
} else {
|
|
node.arguments = [];
|
|
}
|
|
return this.finishNode(node, "NewExpression");
|
|
};
|
|
|
|
lp.parseTemplateElement = function() {
|
|
var elem = this.startNode();
|
|
elem.value = {
|
|
raw: this.input.slice(this.tok.start, this.tok.end),
|
|
cooked: this.tok.value
|
|
};
|
|
this.next();
|
|
elem.tail = this.tok.type === tt.backQuote;
|
|
return this.finishNode(elem, "TemplateElement");
|
|
};
|
|
|
|
lp.parseTemplate = function() {
|
|
var node = this.startNode();
|
|
this.next();
|
|
node.expressions = [];
|
|
var curElt = this.parseTemplateElement();
|
|
node.quasis = [curElt];
|
|
while (!curElt.tail) {
|
|
this.next();
|
|
node.expressions.push(this.parseExpression());
|
|
if (this.expect(tt.braceR)) {
|
|
curElt = this.parseTemplateElement();
|
|
} else {
|
|
curElt = this.startNode();
|
|
curElt.value = {cooked: '', raw: ''};
|
|
curElt.tail = true;
|
|
}
|
|
node.quasis.push(curElt);
|
|
}
|
|
this.expect(tt.backQuote);
|
|
return this.finishNode(node, "TemplateLiteral");
|
|
};
|
|
|
|
lp.parseObj = function() {
|
|
var node = this.startNode();
|
|
node.properties = [];
|
|
this.pushCx();
|
|
var indent = this.curIndent + 1, line = this.curLineStart;
|
|
this.eat(tt.braceL);
|
|
if (this.curIndent + 1 < indent) { indent = this.curIndent; line = this.curLineStart; }
|
|
while (!this.closes(tt.braceR, indent, line)) {
|
|
var prop = this.startNode(), isGenerator, start;
|
|
if (this.options.ecmaVersion >= 6) {
|
|
start = this.storeCurrentPos();
|
|
prop.method = false;
|
|
prop.shorthand = false;
|
|
isGenerator = this.eat(tt.star);
|
|
}
|
|
this.parsePropertyName(prop);
|
|
if (isDummy(prop.key)) { if (isDummy(this.parseMaybeAssign())) this.next(); this.eat(tt.comma); continue; }
|
|
if (this.eat(tt.colon)) {
|
|
prop.kind = "init";
|
|
prop.value = this.parseMaybeAssign();
|
|
} else if (this.options.ecmaVersion >= 6 && (this.tok.type === tt.parenL || this.tok.type === tt.braceL)) {
|
|
prop.kind = "init";
|
|
prop.method = true;
|
|
prop.value = this.parseMethod(isGenerator);
|
|
} else if (this.options.ecmaVersion >= 5 && prop.key.type === "Identifier" &&
|
|
!prop.computed && (prop.key.name === "get" || prop.key.name === "set") &&
|
|
(this.tok.type != tt.comma && this.tok.type != tt.braceR)) {
|
|
prop.kind = prop.key.name;
|
|
this.parsePropertyName(prop);
|
|
prop.value = this.parseMethod(false);
|
|
} else {
|
|
prop.kind = "init";
|
|
if (this.options.ecmaVersion >= 6) {
|
|
if (this.eat(tt.eq)) {
|
|
var assign = this.startNodeAt(start);
|
|
assign.operator = "=";
|
|
assign.left = prop.key;
|
|
assign.right = this.parseMaybeAssign();
|
|
prop.value = this.finishNode(assign, "AssignmentExpression");
|
|
} else {
|
|
prop.value = prop.key;
|
|
}
|
|
} else {
|
|
prop.value = this.dummyIdent();
|
|
}
|
|
prop.shorthand = true;
|
|
}
|
|
node.properties.push(this.finishNode(prop, "Property"));
|
|
this.eat(tt.comma);
|
|
}
|
|
this.popCx();
|
|
if (!this.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)
|
|
this.last.end = this.tok.start;
|
|
if (this.options.locations) this.last.loc.end = this.tok.loc.start;
|
|
}
|
|
return this.finishNode(node, "ObjectExpression");
|
|
};
|
|
|
|
lp.parseClass = function(isStatement) {
|
|
var node = this.startNode();
|
|
this.next();
|
|
if (this.tok.type === tt.name) node.id = this.parseIdent();
|
|
else if (isStatement) node.id = this.dummyIdent();
|
|
else node.id = null;
|
|
node.superClass = this.eat(tt._extends) ? this.parseExpression() : null;
|
|
node.body = this.startNode();
|
|
node.body.body = [];
|
|
this.pushCx();
|
|
var indent = this.curIndent + 1, line = this.curLineStart;
|
|
this.eat(tt.braceL);
|
|
if (this.curIndent + 1 < indent) { indent = this.curIndent; line = this.curLineStart; }
|
|
while (!this.closes(tt.braceR, indent, line)) {
|
|
if (this.semicolon()) continue;
|
|
var method = this.startNode(), isGenerator, start;
|
|
if (this.options.ecmaVersion >= 6) {
|
|
method['static'] = false;
|
|
isGenerator = this.eat(tt.star);
|
|
}
|
|
this.parsePropertyName(method);
|
|
if (isDummy(method.key)) { if (isDummy(this.parseMaybeAssign())) this.next(); this.eat(tt.comma); continue; }
|
|
if (method.key.type === "Identifier" && !method.computed && method.key.name === "static" &&
|
|
(this.tok.type != tt.parenL && this.tok.type != tt.braceL)) {
|
|
method['static'] = true;
|
|
isGenerator = this.eat(tt.star);
|
|
this.parsePropertyName(method);
|
|
} else {
|
|
method['static'] = false;
|
|
}
|
|
if (this.options.ecmaVersion >= 5 && method.key.type === "Identifier" &&
|
|
!method.computed && (method.key.name === "get" || method.key.name === "set") &&
|
|
this.tok.type !== tt.parenL && this.tok.type !== tt.braceL) {
|
|
method.kind = method.key.name;
|
|
this.parsePropertyName(method);
|
|
method.value = this.parseMethod(false);
|
|
} else {
|
|
if (!method.computed && !method['static'] && !isGenerator && (
|
|
method.key.type === "Identifier" && method.key.name === "constructor" ||
|
|
method.key.type === "Literal" && method.key.value === "constructor")) {
|
|
method.kind = "constructor";
|
|
} else {
|
|
method.kind = "method";
|
|
}
|
|
method.value = this.parseMethod(isGenerator);
|
|
}
|
|
node.body.body.push(this.finishNode(method, "MethodDefinition"));
|
|
}
|
|
this.popCx();
|
|
if (!this.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)
|
|
this.last.end = this.tok.start;
|
|
if (this.options.locations) this.last.loc.end = this.tok.loc.start;
|
|
}
|
|
this.semicolon();
|
|
this.finishNode(node.body, "ClassBody");
|
|
return this.finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression");
|
|
};
|
|
|
|
lp.parsePropertyName = function(prop) {
|
|
if (this.options.ecmaVersion >= 6) {
|
|
if (this.eat(tt.bracketL)) {
|
|
prop.computed = true;
|
|
prop.key = this.parseExpression();
|
|
this.expect(tt.bracketR);
|
|
return;
|
|
} else {
|
|
prop.computed = false;
|
|
}
|
|
}
|
|
var key = (this.tok.type === tt.num || this.tok.type === tt.string) ? this.parseExprAtom() : this.parseIdent();
|
|
prop.key = key || this.dummyIdent();
|
|
};
|
|
|
|
lp.parsePropertyAccessor = function() {
|
|
if (this.tok.type === tt.name || this.tok.type.keyword) return this.parseIdent();
|
|
};
|
|
|
|
lp.parseIdent = function() {
|
|
var node = this.startNode();
|
|
node.name = this.tok.type === tt.name ? this.tok.value : this.tok.type.keyword;
|
|
this.next();
|
|
return this.finishNode(node, "Identifier");
|
|
};
|
|
|
|
lp.initFunction = function(node) {
|
|
node.id = null;
|
|
node.params = [];
|
|
if (this.options.ecmaVersion >= 6) {
|
|
node.generator = false;
|
|
node.expression = false;
|
|
}
|
|
};
|
|
|
|
// Convert existing expression atom to assignable pattern
|
|
// if possible.
|
|
|
|
lp.toAssignable = function(node) {
|
|
if (this.options.ecmaVersion >= 6 && node) {
|
|
switch (node.type) {
|
|
case "ObjectExpression":
|
|
node.type = "ObjectPattern";
|
|
var props = node.properties;
|
|
for (var i = 0; i < props.length; i++)
|
|
this.toAssignable(props[i].value);
|
|
break;
|
|
|
|
case "ArrayExpression":
|
|
node.type = "ArrayPattern";
|
|
this.toAssignableList(node.elements);
|
|
break;
|
|
|
|
case "SpreadElement":
|
|
node.type = "RestElement";
|
|
node.argument = this.toAssignable(node.argument);
|
|
break;
|
|
|
|
case "AssignmentExpression":
|
|
node.type = "AssignmentPattern";
|
|
break;
|
|
}
|
|
}
|
|
return this.checkLVal(node);
|
|
};
|
|
|
|
lp.toAssignableList = function(exprList) {
|
|
for (var i = 0; i < exprList.length; i++)
|
|
this.toAssignable(exprList[i]);
|
|
return exprList;
|
|
};
|
|
|
|
lp.parseFunctionParams = function(params) {
|
|
this.pushCx();
|
|
params = this.parseExprList(tt.parenR);
|
|
return this.toAssignableList(params);
|
|
};
|
|
|
|
lp.parseFunction = function(node, isStatement) {
|
|
this.initFunction(node);
|
|
if (this.options.ecmaVersion >= 6) {
|
|
node.generator = this.eat(tt.star);
|
|
}
|
|
if (this.tok.type === tt.name) node.id = this.parseIdent();
|
|
else if (isStatement) node.id = this.dummyIdent();
|
|
node.params = this.parseFunctionParams();
|
|
node.body = this.parseBlock();
|
|
return this.finishNode(node, isStatement ? "FunctionDeclaration" : "FunctionExpression");
|
|
};
|
|
|
|
lp.parseMethod = function(isGenerator) {
|
|
var node = this.startNode();
|
|
this.initFunction(node);
|
|
node.params = this.parseFunctionParams();
|
|
node.generator = isGenerator || false;
|
|
node.expression = this.options.ecmaVersion >= 6 && this.tok.type !== tt.braceL;
|
|
node.body = node.expression ? this.parseMaybeAssign() : this.parseBlock();
|
|
return this.finishNode(node, "FunctionExpression");
|
|
};
|
|
|
|
lp.parseArrowExpression = function(node, params) {
|
|
this.initFunction(node);
|
|
node.params = this.toAssignableList(params);
|
|
node.expression = this.tok.type !== tt.braceL;
|
|
node.body = node.expression ? this.parseMaybeAssign() : this.parseBlock();
|
|
return this.finishNode(node, "ArrowFunctionExpression");
|
|
};
|
|
|
|
lp.parseExport = function() {
|
|
var node = this.startNode();
|
|
this.next();
|
|
if (this.eat(tt.star)) {
|
|
node.source = this.eatContextual("from") ? this.parseExprAtom() : null;
|
|
return this.finishNode(node, "ExportAllDeclaration");
|
|
}
|
|
if (this.eat(tt._default)) {
|
|
var expr = this.parseMaybeAssign();
|
|
if (expr.id) {
|
|
switch (expr.type) {
|
|
case "FunctionExpression": expr.type = "FunctionDeclaration"; break;
|
|
case "ClassExpression": expr.type = "ClassDeclaration"; break;
|
|
}
|
|
}
|
|
node.declaration = expr;
|
|
this.semicolon();
|
|
return this.finishNode(node, "ExportDefaultDeclaration");
|
|
}
|
|
if (this.tok.type.keyword) {
|
|
node.declaration = this.parseStatement();
|
|
node.specifiers = [];
|
|
node.source = null;
|
|
} else {
|
|
node.declaration = null;
|
|
node.specifiers = this.parseExportSpecifierList();
|
|
node.source = this.eatContextual("from") ? this.parseExprAtom() : null;
|
|
this.semicolon();
|
|
}
|
|
return this.finishNode(node, "ExportNamedDeclaration");
|
|
};
|
|
|
|
lp.parseImport = function() {
|
|
var node = this.startNode();
|
|
this.next();
|
|
if (this.tok.type === tt.string) {
|
|
node.specifiers = [];
|
|
node.source = this.parseExprAtom();
|
|
node.kind = '';
|
|
} else {
|
|
if (this.tok.type === tt.name && this.tok.value !== "from") {
|
|
var elt = this.startNode();
|
|
elt.local = this.parseIdent();
|
|
this.finishNode(elt, "ImportDefaultSpecifier");
|
|
this.eat(tt.comma);
|
|
}
|
|
node.specifiers = this.parseImportSpecifierList();
|
|
node.source = this.eatContextual("from") ? this.parseExprAtom() : null;
|
|
if (elt) node.specifiers.unshift(elt);
|
|
}
|
|
this.semicolon();
|
|
return this.finishNode(node, "ImportDeclaration");
|
|
};
|
|
|
|
lp.parseImportSpecifierList = function() {
|
|
var elts = [];
|
|
if (this.tok.type === tt.star) {
|
|
var elt = this.startNode();
|
|
this.next();
|
|
if (this.eatContextual("as")) elt.local = this.parseIdent();
|
|
elts.push(this.finishNode(elt, "ImportNamespaceSpecifier"));
|
|
} else {
|
|
var indent = this.curIndent, line = this.curLineStart, continuedLine = this.nextLineStart;
|
|
this.pushCx();
|
|
this.eat(tt.braceL);
|
|
if (this.curLineStart > continuedLine) continuedLine = this.curLineStart;
|
|
while (!this.closes(tt.braceR, indent + (this.curLineStart <= continuedLine ? 1 : 0), line)) {
|
|
var elt = this.startNode();
|
|
if (this.eat(tt.star)) {
|
|
if (this.eatContextual("as")) elt.local = this.parseIdent();
|
|
this.finishNode(elt, "ImportNamespaceSpecifier");
|
|
} else {
|
|
if (this.isContextual("from")) break;
|
|
elt.imported = this.parseIdent();
|
|
elt.local = this.eatContextual("as") ? this.parseIdent() : elt.imported;
|
|
this.finishNode(elt, "ImportSpecifier");
|
|
}
|
|
elts.push(elt);
|
|
this.eat(tt.comma);
|
|
}
|
|
this.eat(tt.braceR);
|
|
this.popCx();
|
|
}
|
|
return elts;
|
|
};
|
|
|
|
lp.parseExportSpecifierList = function() {
|
|
var elts = [];
|
|
var indent = this.curIndent, line = this.curLineStart, continuedLine = this.nextLineStart;
|
|
this.pushCx();
|
|
this.eat(tt.braceL);
|
|
if (this.curLineStart > continuedLine) continuedLine = this.curLineStart;
|
|
while (!this.closes(tt.braceR, indent + (this.curLineStart <= continuedLine ? 1 : 0), line)) {
|
|
if (this.isContextual("from")) break;
|
|
var elt = this.startNode();
|
|
elt.local = this.parseIdent();
|
|
elt.exported = this.eatContextual("as") ? this.parseIdent() : elt.local;
|
|
this.finishNode(elt, "ExportSpecifier");
|
|
elts.push(elt);
|
|
this.eat(tt.comma);
|
|
}
|
|
this.eat(tt.braceR);
|
|
this.popCx();
|
|
return elts;
|
|
};
|
|
|
|
lp.parseExprList = function(close, allowEmpty) {
|
|
var indent = this.curIndent, line = this.curLineStart, elts = [];
|
|
this.next(); // Opening bracket
|
|
while (!this.closes(close, indent + 1, line)) {
|
|
if (this.eat(tt.comma)) {
|
|
elts.push(allowEmpty ? null : this.dummyIdent());
|
|
continue;
|
|
}
|
|
var elt = this.parseMaybeAssign();
|
|
if (isDummy(elt)) {
|
|
if (this.closes(close, indent, line)) break;
|
|
this.next();
|
|
} else {
|
|
elts.push(elt);
|
|
}
|
|
this.eat(tt.comma);
|
|
}
|
|
this.popCx();
|
|
if (!this.eat(close)) {
|
|
// If there is no closing brace, make the node span to the start
|
|
// of the next token (this is useful for Tern)
|
|
this.last.end = this.tok.start;
|
|
if (this.options.locations) this.last.loc.end = this.tok.loc.start;
|
|
}
|
|
return elts;
|
|
};
|
|
});
|