mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
775 lines
23 KiB
JavaScript
775 lines
23 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(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(self.acorn || (self.acorn = {}), self.acorn); // Plain browser env
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})(function(exports, acorn) {
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"use strict";
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var tt = acorn.tokTypes;
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var options, input, fetchToken, context;
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exports.parse_dammit = function(inpt, opts) {
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if (!opts) opts = {};
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input = String(inpt);
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options = opts;
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if (!opts.tabSize) opts.tabSize = 4;
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fetchToken = acorn.tokenize(inpt, opts);
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sourceFile = options.sourceFile || null;
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context = [];
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nextLineStart = 0;
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ahead.length = 0;
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next();
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return parseTopLevel();
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};
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var lastEnd, token = {start: 0, end: 0}, ahead = [];
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var curLineStart, nextLineStart, curIndent, lastEndLoc, sourceFile;
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function next() {
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lastEnd = token.end;
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if (options.locations)
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lastEndLoc = token.endLoc;
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if (ahead.length)
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token = ahead.shift();
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else
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token = readToken();
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if (token.start >= nextLineStart) {
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while (token.start >= nextLineStart) {
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curLineStart = nextLineStart;
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nextLineStart = lineEnd(curLineStart) + 1;
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}
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curIndent = indentationAfter(curLineStart);
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}
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}
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function readToken() {
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for (;;) {
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try {
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return fetchToken();
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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 = lineEnd(e.pos);
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if (/string/.test(msg)) {
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replace = {start: e.pos, end: pos, type: tt.string, value: input.slice(e.pos + 1, pos)};
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} else if (/regular expr/i.test(msg)) {
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var re = 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 {
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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 < input.length && !isSpace(input.charCodeAt(pos))) ++pos;
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} else if (/character escape|expected hexadecimal/i.test(msg)) {
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while (pos < input.length) {
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var ch = input.charCodeAt(pos++);
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if (ch === 34 || ch === 39 || 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 {
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throw e;
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}
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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 (options.locations) {
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replace.startLoc = acorn.getLineInfo(input, replace.start);
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replace.endLoc = acorn.getLineInfo(input, replace.end);
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}
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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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function resetTo(pos) {
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var ch = input.charAt(pos - 1);
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var reAllowed = !ch || /[\[\{\(,;:?\/*=+\-~!|&%^<>]/.test(ch) ||
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/[enwfd]/.test(ch) && /\b(keywords|case|else|return|throw|new|in|(instance|type)of|delete|void)$/.test(input.slice(pos - 10, pos));
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fetchToken.jumpTo(pos, reAllowed);
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}
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function copyToken(token) {
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var copy = {start: token.start, end: token.end, type: token.type, value: token.value};
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if (options.locations) {
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copy.startLoc = token.startLoc;
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copy.endLoc = token.endLoc;
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}
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return copy;
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}
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function lookAhead(n) {
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// Copy token objects, because fetchToken will overwrite the one
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// it returns, and in this case we still need it
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if (!ahead.length)
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token = copyToken(token);
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while (n > ahead.length)
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ahead.push(copyToken(readToken()));
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return ahead[n-1];
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}
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var newline = /[\n\r\u2028\u2029]/;
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function isNewline(ch) {
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return ch === 10 || ch === 13 || ch === 8232 || ch === 8329;
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}
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function isSpace(ch) {
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return (ch < 14 && ch > 8) || ch === 32 || ch === 160 || isNewline(ch);
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}
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function pushCx() {
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context.push(curIndent);
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}
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function popCx() {
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curIndent = context.pop();
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}
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function lineEnd(pos) {
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while (pos < input.length && !isNewline(input.charCodeAt(pos))) ++pos;
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return pos;
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}
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function lineStart(pos) {
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while (pos > 0 && !isNewline(input.charCodeAt(pos - 1))) --pos;
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return pos;
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}
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function indentationAfter(pos) {
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for (var count = 0;; ++pos) {
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var ch = input.charCodeAt(pos);
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if (ch === 32) ++count;
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else if (ch === 9) count += options.tabSize;
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else return count;
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}
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}
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function closesBlock(closeTok, indent, line) {
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if (token.type === closeTok || token.type === tt.eof) return true;
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if (line != curLineStart && curIndent < indent && tokenStartsLine() &&
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(nextLineStart >= input.length ||
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indentationAfter(nextLineStart) < indent)) return true;
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return false;
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}
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function tokenStartsLine() {
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for (var p = token.start - 1; p > curLineStart; --p) {
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var ch = 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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function node_t(start) {
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this.type = null;
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this.start = start;
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this.end = null;
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}
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function node_loc_t(start) {
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this.start = start || token.startLoc || {line: 1, column: 0};
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this.end = null;
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if (sourceFile !== null) this.source = sourceFile;
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}
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function startNode() {
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var node = new node_t(token.start);
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if (options.locations)
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node.loc = new node_loc_t();
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return node
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}
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function startNodeFrom(other) {
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var node = new node_t(other.start);
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if (options.locations)
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node.loc = new node_loc_t(other.loc.start);
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return node;
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}
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function finishNode(node, type) {
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node.type = type;
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node.end = lastEnd;
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if (options.locations)
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node.loc.end = lastEndLoc;
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return node;
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}
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function getDummyLoc() {
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if (options.locations) {
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var loc = new node_loc_t();
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loc.end = loc.start;
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return loc;
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}
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};
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function dummyIdent() {
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var dummy = new node_t(token.start);
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dummy.type = "Identifier";
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dummy.end = token.start;
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dummy.name = "✖";
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dummy.loc = getDummyLoc();
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return dummy;
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}
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function isDummy(node) { return node.name == "✖"; }
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function eat(type) {
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if (token.type === type) {
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next();
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return true;
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}
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}
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function canInsertSemicolon() {
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return (token.type === tt.eof || token.type === tt.braceR || newline.test(input.slice(lastEnd, token.start)));
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}
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function semicolon() {
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eat(tt.semi);
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}
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function expect(type) {
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if (eat(type)) return true;
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if (lookAhead(1).type == type) {
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next(); next();
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return true;
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}
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if (lookAhead(2).type == type) {
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next(); next(); next();
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return true;
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}
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}
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function checkLVal(expr) {
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if (expr.type === "Identifier" || expr.type === "MemberExpression") return expr;
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return dummyIdent();
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}
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function parseTopLevel() {
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var node = startNode();
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node.body = [];
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while (token.type !== tt.eof) node.body.push(parseStatement());
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return finishNode(node, "Program");
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}
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function parseStatement() {
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var starttype = token.type, node = startNode();
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switch (starttype) {
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case tt.break: case tt.continue:
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next();
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var isBreak = starttype === tt.break;
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node.label = token.type === tt.name ? parseIdent() : null;
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semicolon();
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return finishNode(node, isBreak ? "BreakStatement" : "ContinueStatement");
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case tt.debugger:
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next();
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semicolon();
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return finishNode(node, "DebuggerStatement");
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case tt.do:
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next();
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node.body = parseStatement();
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node.test = eat(tt.while) ? parseParenExpression() : dummyIdent();
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semicolon();
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return finishNode(node, "DoWhileStatement");
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case tt.for:
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next();
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pushCx();
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expect(tt.parenL);
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if (token.type === tt.semi) return parseFor(node, null);
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if (token.type === tt.var) {
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var init = startNode();
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next();
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parseVar(init, true);
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if (init.declarations.length === 1 && eat(tt.in))
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return parseForIn(node, init);
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return parseFor(node, init);
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}
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var init = parseExpression(false, true);
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if (eat(tt.in)) {return parseForIn(node, checkLVal(init));}
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return parseFor(node, init);
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case tt.function:
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next();
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return parseFunction(node, true);
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case tt.if:
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next();
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node.test = parseParenExpression();
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node.consequent = parseStatement();
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node.alternate = eat(tt.else) ? parseStatement() : null;
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return finishNode(node, "IfStatement");
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case tt.return:
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next();
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if (eat(tt.semi) || canInsertSemicolon()) node.argument = null;
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else { node.argument = parseExpression(); semicolon(); }
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return finishNode(node, "ReturnStatement");
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case tt.switch:
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var blockIndent = curIndent, line = curLineStart;
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next();
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node.discriminant = parseParenExpression();
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node.cases = [];
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pushCx();
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expect(tt.braceL);
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for (var cur; !closesBlock(tt.braceR, blockIndent, line);) {
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if (token.type === tt.case || token.type === tt.default) {
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var isCase = token.type === tt.case;
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if (cur) finishNode(cur, "SwitchCase");
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node.cases.push(cur = startNode());
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cur.consequent = [];
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next();
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if (isCase) cur.test = parseExpression();
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else cur.test = null;
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expect(tt.colon);
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} else {
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if (!cur) {
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node.cases.push(cur = 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(parseStatement());
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}
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}
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if (cur) finishNode(cur, "SwitchCase");
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popCx();
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eat(tt.braceR);
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return finishNode(node, "SwitchStatement");
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case tt.throw:
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next();
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node.argument = parseExpression();
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semicolon();
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return finishNode(node, "ThrowStatement");
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case tt.try:
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next();
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node.block = parseBlock();
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node.handler = null;
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if (token.type === tt.catch) {
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var clause = startNode();
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next();
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expect(tt.parenL);
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clause.param = parseIdent();
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expect(tt.parenR);
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clause.guard = null;
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clause.body = parseBlock();
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node.handler = finishNode(clause, "CatchClause");
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}
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node.finalizer = eat(tt.finally) ? parseBlock() : null;
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if (!node.handler && !node.finalizer) return node.block;
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return finishNode(node, "TryStatement");
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case tt.var:
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next();
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node = parseVar(node);
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semicolon();
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return node;
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case tt.while:
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next();
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node.test = parseParenExpression();
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node.body = parseStatement();
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return finishNode(node, "WhileStatement");
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case tt.with:
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next();
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node.object = parseParenExpression();
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node.body = parseStatement();
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return finishNode(node, "WithStatement");
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case tt.braceL:
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return parseBlock();
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case tt.semi:
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next();
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return finishNode(node, "EmptyStatement");
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default:
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var maybeName = token.value, expr = parseExpression();
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if (isDummy(expr)) {
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next();
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if (token.type === tt.eof) return finishNode(node, "EmptyStatement");
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return parseStatement();
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} else if (starttype === tt.name && expr.type === "Identifier" && eat(tt.colon)) {
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node.body = parseStatement();
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node.label = expr;
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return finishNode(node, "LabeledStatement");
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} else {
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node.expression = expr;
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semicolon();
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return finishNode(node, "ExpressionStatement");
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}
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}
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}
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function parseBlock() {
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var node = startNode();
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pushCx();
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expect(tt.braceL);
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var blockIndent = curIndent, line = curLineStart;
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node.body = [];
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while (!closesBlock(tt.braceR, blockIndent, line))
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node.body.push(parseStatement());
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popCx();
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eat(tt.braceR);
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return finishNode(node, "BlockStatement");
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}
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function parseFor(node, init) {
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node.init = init;
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node.test = node.update = null;
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if (eat(tt.semi) && token.type !== tt.semi) node.test = parseExpression();
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if (eat(tt.semi) && token.type !== tt.parenR) node.update = parseExpression();
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popCx();
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expect(tt.parenR);
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node.body = parseStatement();
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return finishNode(node, "ForStatement");
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}
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function parseForIn(node, init) {
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node.left = init;
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node.right = parseExpression();
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popCx();
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expect(tt.parenR);
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node.body = parseStatement();
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return finishNode(node, "ForInStatement");
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}
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function parseVar(node, noIn) {
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node.declarations = [];
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node.kind = "var";
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while (token.type === tt.name) {
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var decl = startNode();
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decl.id = parseIdent();
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decl.init = eat(tt.eq) ? parseExpression(true, noIn) : null;
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node.declarations.push(finishNode(decl, "VariableDeclarator"));
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if (!eat(tt.comma)) break;
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}
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return finishNode(node, "VariableDeclaration");
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}
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function parseExpression(noComma, noIn) {
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var expr = parseMaybeAssign(noIn);
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if (!noComma && token.type === tt.comma) {
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var node = startNodeFrom(expr);
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node.expressions = [expr];
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while (eat(tt.comma)) node.expressions.push(parseMaybeAssign(noIn));
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return finishNode(node, "SequenceExpression");
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}
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return expr;
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}
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function parseParenExpression() {
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pushCx();
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expect(tt.parenL);
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var val = parseExpression();
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popCx();
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expect(tt.parenR);
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return val;
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}
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function parseMaybeAssign(noIn) {
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var left = parseMaybeConditional(noIn);
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if (token.type.isAssign) {
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var node = startNodeFrom(left);
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node.operator = token.value;
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node.left = checkLVal(left);
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next();
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node.right = parseMaybeAssign(noIn);
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return finishNode(node, "AssignmentExpression");
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}
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return left;
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}
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function parseMaybeConditional(noIn) {
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var expr = parseExprOps(noIn);
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if (eat(tt.question)) {
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var node = startNodeFrom(expr);
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node.test = expr;
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node.consequent = parseExpression(true);
|
|
node.alternate = expect(tt.colon) ? parseExpression(true, noIn) : dummyIdent();
|
|
return finishNode(node, "ConditionalExpression");
|
|
}
|
|
return expr;
|
|
}
|
|
|
|
function parseExprOps(noIn) {
|
|
var indent = curIndent, line = curLineStart;
|
|
return parseExprOp(parseMaybeUnary(noIn), -1, noIn, indent, line);
|
|
}
|
|
|
|
function parseExprOp(left, 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 = startNodeFrom(left);
|
|
node.left = left;
|
|
node.operator = token.value;
|
|
next();
|
|
if (curLineStart != line && curIndent < indent && tokenStartsLine())
|
|
node.right = dummyIdent();
|
|
else
|
|
node.right = parseExprOp(parseMaybeUnary(noIn), prec, noIn, indent, line);
|
|
var node = finishNode(node, /&&|\|\|/.test(node.operator) ? "LogicalExpression" : "BinaryExpression");
|
|
return parseExprOp(node, minPrec, noIn, indent, line);
|
|
}
|
|
}
|
|
return left;
|
|
}
|
|
|
|
function parseMaybeUnary(noIn) {
|
|
if (token.type.prefix) {
|
|
var node = startNode(), update = token.type.isUpdate;
|
|
node.operator = token.value;
|
|
node.prefix = true;
|
|
next();
|
|
node.argument = parseMaybeUnary(noIn);
|
|
if (update) node.argument = checkLVal(node.argument);
|
|
return finishNode(node, update ? "UpdateExpression" : "UnaryExpression");
|
|
}
|
|
var expr = parseExprSubscripts();
|
|
while (token.type.postfix && !canInsertSemicolon()) {
|
|
var node = startNodeFrom(expr);
|
|
node.operator = token.value;
|
|
node.prefix = false;
|
|
node.argument = checkLVal(expr);
|
|
next();
|
|
expr = finishNode(node, "UpdateExpression");
|
|
}
|
|
return expr;
|
|
}
|
|
|
|
function parseExprSubscripts() {
|
|
var indent = curIndent, line = curLineStart;
|
|
return parseSubscripts(parseExprAtom(), false, curIndent, line);
|
|
}
|
|
|
|
function parseSubscripts(base, 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 = startNodeFrom(base);
|
|
node.object = base;
|
|
if (curLineStart != line && curIndent <= startIndent && tokenStartsLine())
|
|
node.property = dummyIdent();
|
|
else
|
|
node.property = parsePropertyName() || dummyIdent();
|
|
node.computed = false;
|
|
base = finishNode(node, "MemberExpression");
|
|
} else if (token.type == tt.bracketL) {
|
|
pushCx();
|
|
next();
|
|
var node = startNodeFrom(base);
|
|
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 = startNodeFrom(base);
|
|
node.callee = base;
|
|
node.arguments = parseExprList(tt.parenR);
|
|
base = finishNode(node, "CallExpression");
|
|
} else {
|
|
return base;
|
|
}
|
|
}
|
|
}
|
|
|
|
function parseExprAtom() {
|
|
switch (token.type) {
|
|
case tt.this:
|
|
var node = startNode();
|
|
next();
|
|
return finishNode(node, "ThisExpression");
|
|
case tt.name:
|
|
return parseIdent();
|
|
case tt.num: case tt.string: case tt.regexp:
|
|
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 tokStart1 = token.start;
|
|
next();
|
|
var val = parseExpression();
|
|
val.start = tokStart1;
|
|
val.end = token.end;
|
|
expect(tt.parenR);
|
|
return val;
|
|
|
|
case tt.bracketL:
|
|
var node = startNode();
|
|
pushCx();
|
|
node.elements = parseExprList(tt.bracketR);
|
|
return finishNode(node, "ArrayExpression");
|
|
|
|
case tt.braceL:
|
|
return parseObj();
|
|
|
|
case tt.function:
|
|
var node = startNode();
|
|
next();
|
|
return parseFunction(node, false);
|
|
|
|
case tt.new:
|
|
return parseNew();
|
|
|
|
default:
|
|
return dummyIdent();
|
|
}
|
|
}
|
|
|
|
function parseNew() {
|
|
var node = startNode(), startIndent = curIndent, line = curLineStart;
|
|
next();
|
|
node.callee = parseSubscripts(parseExprAtom(), true, startIndent, line);
|
|
if (token.type == tt.parenL) {
|
|
pushCx();
|
|
node.arguments = parseExprList(tt.parenR);
|
|
} else {
|
|
node.arguments = [];
|
|
}
|
|
return finishNode(node, "NewExpression");
|
|
}
|
|
|
|
function parseObj() {
|
|
var node = startNode();
|
|
node.properties = [];
|
|
pushCx();
|
|
next();
|
|
var propIndent = curIndent, line = curLineStart;
|
|
while (!closesBlock(tt.braceR, propIndent, line)) {
|
|
var name = parsePropertyName();
|
|
if (!name) { if (isDummy(parseExpression(true))) next(); eat(tt.comma); continue; }
|
|
var prop = {key: name}, isGetSet = false, kind;
|
|
if (eat(tt.colon)) {
|
|
prop.value = parseExpression(true);
|
|
kind = prop.kind = "init";
|
|
} else if (options.ecmaVersion >= 5 && prop.key.type === "Identifier" &&
|
|
(prop.key.name === "get" || prop.key.name === "set")) {
|
|
isGetSet = true;
|
|
kind = prop.kind = prop.key.name;
|
|
prop.key = parsePropertyName() || dummyIdent();
|
|
prop.value = parseFunction(startNode(), false);
|
|
} else {
|
|
next();
|
|
eat(tt.comma);
|
|
continue;
|
|
}
|
|
|
|
node.properties.push(prop);
|
|
eat(tt.comma);
|
|
}
|
|
popCx();
|
|
eat(tt.braceR);
|
|
return finishNode(node, "ObjectExpression");
|
|
}
|
|
|
|
function parsePropertyName() {
|
|
if (token.type === tt.num || token.type === tt.string) return parseExprAtom();
|
|
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 parseFunction(node, isStatement) {
|
|
if (token.type === tt.name) node.id = parseIdent();
|
|
else if (isStatement) node.id = dummyIdent();
|
|
else node.id = null;
|
|
node.params = [];
|
|
pushCx();
|
|
expect(tt.parenL);
|
|
while (token.type == tt.name) {
|
|
node.params.push(parseIdent());
|
|
eat(tt.comma);
|
|
}
|
|
popCx();
|
|
eat(tt.parenR);
|
|
node.body = parseBlock();
|
|
return finishNode(node, isStatement ? "FunctionDeclaration" : "FunctionExpression");
|
|
}
|
|
|
|
function parseExprList(close) {
|
|
var indent = curIndent + 1, line = curLineStart, elts = [];
|
|
next(); // Opening bracket
|
|
while (!closesBlock(close, indent, line)) {
|
|
var elt = parseExpression(true);
|
|
if (isDummy(elt)) {
|
|
if (closesBlock(close, indent, line)) break;
|
|
next();
|
|
} else {
|
|
elts.push(elt);
|
|
}
|
|
while (eat(tt.comma)) {}
|
|
}
|
|
popCx();
|
|
eat(close);
|
|
return elts;
|
|
}
|
|
});
|