757 lines
24 KiB
JavaScript
757 lines
24 KiB
JavaScript
import { isIdentifierStart, isIdentifierChar } from "../util/identifier";
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import { types as tt, keywords as keywordTypes } from "./types";
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import { SourceLocation } from "../locutil";
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import { lineBreak, lineBreakG, isNewLine, nonASCIIwhitespace } from "../util/whitespace";
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// Object type used to represent tokens. Note that normally, tokens
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// simply exist as properties on the parser object. This is only
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// used for the onToken callback and the external tokenizer.
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export class Token {
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constructor(p) {
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this.type = p.type;
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this.value = p.value;
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this.start = p.start;
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this.end = p.end;
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this.loc = new SourceLocation(p.startLoc, p.endLoc);
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}
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}
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// ## Tokenizer
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// Are we running under Rhino?
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/* global Packages */
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const isRhino = typeof Packages === "object" && Object.prototype.toString.call(Packages) === "[object JavaPackage]";
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// Parse a regular expression. Some context-awareness is necessary,
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// since a '/' inside a '[]' set does not end the expression.
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function tryCreateRegexp(src, flags, throwErrorStart) {
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try {
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return new RegExp(src, flags);
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} catch (e) {
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if (throwErrorStart !== undefined) {
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if (e instanceof SyntaxError) this.raise(throwErrorStart, "Error parsing regular expression: " + e.message);
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this.raise(e);
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}
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}
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}
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var regexpUnicodeSupport = !!tryCreateRegexp("\uffff", "u");
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function codePointToString(code) {
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// UTF-16 Decoding
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if (code <= 0xFFFF) return String.fromCharCode(code);
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return String.fromCharCode(((code - 0x10000) >> 10) + 0xD800, ((code - 0x10000) & 1023) + 0xDC00);
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}
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// Used to signal to callers of `readWord1` whether the word
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// contained any escape sequences. This is needed because words with
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// escape sequences must not be interpreted as keywords.
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var containsEsc;
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export default class Tokenizer {
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constructor() {
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// The current position of the tokenizer in the input.
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this.pos = this.lineStart = 0;
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this.curLine = 1;
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// Properties of the current token:
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// Its type
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this.type = tt.eof;
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// For tokens that include more information than their type, the value
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this.value = null;
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// Its start and end offset
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this.start = this.end = this.pos;
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// And, if locations are used, the {line, column} object
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// corresponding to those offsets
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this.startLoc = this.endLoc = this.curPosition();
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// Position information for the previous token
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this.lastTokEndLoc = this.lastTokStartLoc = null;
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this.lastTokStart = this.lastTokEnd = this.pos;
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// The context stack is used to superficially track syntactic
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// context to predict whether a regular expression is allowed in a
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// given position.
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this.context = this.initialContext();
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this.exprAllowed = true;
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}
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// Move to the next token
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next() {
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if (!this.isLookahead) {
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this.tokens.push(new Token(this));
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}
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this.lastTokEnd = this.end;
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this.lastTokStart = this.start;
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this.lastTokEndLoc = this.endLoc;
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this.lastTokStartLoc = this.startLoc;
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this.nextToken();
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};
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getToken() {
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this.next();
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return new Token(this);
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}
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// Toggle strict mode. Re-reads the next number or string to please
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// pedantic tests (`"use strict"; 010;` should fail).
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setStrict(strict) {
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this.strict = strict;
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if (this.type !== tt.num && this.type !== tt.string) return;
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this.pos = this.start;
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while (this.pos < this.lineStart) {
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this.lineStart = this.input.lastIndexOf("\n", this.lineStart - 2) + 1;
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--this.curLine;
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}
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this.nextToken();
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}
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curContext() {
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return this.context[this.context.length - 1];
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}
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// Read a single token, updating the parser object's token-related
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// properties.
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nextToken() {
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let curContext = this.curContext();
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if (!curContext || !curContext.preserveSpace) this.skipSpace();
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this.start = this.pos;
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this.startLoc = this.curPosition();
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if (this.pos >= this.input.length) return this.finishToken(tt.eof);
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if (curContext.override) {
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return curContext.override(this);
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} else {
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return this.readToken(this.fullCharCodeAtPos());
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}
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}
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readToken(code) {
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// Identifier or keyword. '\uXXXX' sequences are allowed in
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// identifiers, so '\' also dispatches to that.
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if (isIdentifierStart(code, true) || code === 92 /* '\' */)
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return this.readWord();
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return this.getTokenFromCode(code);
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}
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fullCharCodeAtPos() {
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let code = this.input.charCodeAt(this.pos);
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if (code <= 0xd7ff || code >= 0xe000) return code;
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let next = this.input.charCodeAt(this.pos + 1);
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return (code << 10) + next - 0x35fdc00;
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}
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pushComment(block, text, start, end, startLoc, endLoc) {
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var comment = {
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type: block ? "CommentBlock" : "CommentLine",
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value: text,
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start: start,
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end: end,
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loc: new SourceLocation(startLoc, endLoc),
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range: [start, end]
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};
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this.tokens.push(comment);
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this.comments.push(comment);
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this.addComment(comment);
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}
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skipBlockComment() {
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let startLoc = this.curPosition();
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let start = this.pos, end = this.input.indexOf("*/", this.pos += 2);
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if (end === -1) this.raise(this.pos - 2, "Unterminated comment");
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this.pos = end + 2;
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lineBreakG.lastIndex = start;
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let match;
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while ((match = lineBreakG.exec(this.input)) && match.index < this.pos) {
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++this.curLine;
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this.lineStart = match.index + match[0].length;
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}
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this.pushComment(true, this.input.slice(start + 2, end), start, this.pos, startLoc, this.curPosition());
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}
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skipLineComment(startSkip) {
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let start = this.pos;
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let startLoc = this.curPosition();
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let ch = this.input.charCodeAt(this.pos += startSkip);
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while (this.pos < this.input.length && ch !== 10 && ch !== 13 && ch !== 8232 && ch !== 8233) {
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++this.pos;
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ch = this.input.charCodeAt(this.pos);
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}
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this.pushComment(false, this.input.slice(start + startSkip, this.pos), start, this.pos, startLoc, this.curPosition());
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}
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// Called at the start of the parse and after every token. Skips
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// whitespace and comments, and.
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skipSpace() {
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loop: while (this.pos < this.input.length) {
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let ch = this.input.charCodeAt(this.pos);
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switch (ch) {
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case 32: case 160: // ' '
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++this.pos;
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break;
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case 13:
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if (this.input.charCodeAt(this.pos + 1) === 10) {
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++this.pos;
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}
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case 10: case 8232: case 8233:
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++this.pos;
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++this.curLine;
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this.lineStart = this.pos;
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break;
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case 47: // '/'
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switch (this.input.charCodeAt(this.pos + 1)) {
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case 42: // '*'
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this.skipBlockComment();
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break;
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case 47:
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this.skipLineComment(2);
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break;
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default:
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break loop;
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}
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break;
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default:
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if (ch > 8 && ch < 14 || ch >= 5760 && nonASCIIwhitespace.test(String.fromCharCode(ch))) {
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++this.pos;
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} else {
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break loop;
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}
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}
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}
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}
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// Called at the end of every token. Sets `end`, `val`, and
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// maintains `context` and `exprAllowed`, and skips the space after
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// the token, so that the next one's `start` will point at the
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// right position.
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finishToken(type, val) {
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this.end = this.pos;
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this.endLoc = this.curPosition();
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let prevType = this.type;
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this.type = type;
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this.value = val;
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this.updateContext(prevType);
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}
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// ### Token reading
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// This is the function that is called to fetch the next token. It
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// is somewhat obscure, because it works in character codes rather
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// than characters, and because operator parsing has been inlined
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// into it.
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//
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// All in the name of speed.
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//
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readToken_dot() {
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let next = this.input.charCodeAt(this.pos + 1);
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if (next >= 48 && next <= 57) return this.readNumber(true);
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let next2 = this.input.charCodeAt(this.pos + 2);
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if (next === 46 && next2 === 46) { // 46 = dot '.'
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this.pos += 3;
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return this.finishToken(tt.ellipsis);
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} else {
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++this.pos;
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return this.finishToken(tt.dot);
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}
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}
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readToken_slash() { // '/'
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let next = this.input.charCodeAt(this.pos + 1);
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if (this.exprAllowed) {
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++this.pos;
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return this.readRegexp();
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}
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if (next === 61) return this.finishOp(tt.assign, 2);
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return this.finishOp(tt.slash, 1);
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}
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readToken_mult_modulo(code) { // '%*'
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var type = code === 42 ? tt.star : tt.modulo;
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var width = 1;
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var next = this.input.charCodeAt(this.pos + 1);
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if (next === 42 && this.options.features["es7.exponentiationOperator"]) { // '*'
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width++;
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next = this.input.charCodeAt(this.pos + 2);
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type = tt.exponent;
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}
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if (next === 61) {
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width++;
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type = tt.assign;
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}
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return this.finishOp(type, width);
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}
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readToken_pipe_amp(code) { // '|&'
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let next = this.input.charCodeAt(this.pos + 1);
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if (next === code) return this.finishOp(code === 124 ? tt.logicalOR : tt.logicalAND, 2);
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if (next === 61) return this.finishOp(tt.assign, 2);
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return this.finishOp(code === 124 ? tt.bitwiseOR : tt.bitwiseAND, 1);
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}
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readToken_caret() { // '^'
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let next = this.input.charCodeAt(this.pos + 1);
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if (next === 61) {
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return this.finishOp(tt.assign, 2);
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} else {
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return this.finishOp(tt.bitwiseXOR, 1);
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}
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}
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readToken_plus_min(code) { // '+-'
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let next = this.input.charCodeAt(this.pos + 1);
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if (next === code) {
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if (next === 45 && this.input.charCodeAt(this.pos + 2) === 62 && lineBreak.test(this.input.slice(this.lastTokEnd, this.pos))) {
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// A `-->` line comment
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this.skipLineComment(3);
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this.skipSpace();
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return this.nextToken();
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}
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return this.finishOp(tt.incDec, 2);
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}
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if (next === 61) {
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return this.finishOp(tt.assign, 2);
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} else {
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return this.finishOp(tt.plusMin, 1);
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}
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}
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readToken_lt_gt(code) { // '<>'
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let next = this.input.charCodeAt(this.pos + 1);
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let size = 1;
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if (next === code) {
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size = code === 62 && this.input.charCodeAt(this.pos + 2) === 62 ? 3 : 2;
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if (this.input.charCodeAt(this.pos + size) === 61) return this.finishOp(tt.assign, size + 1);
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return this.finishOp(tt.bitShift, size);
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}
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if (next === 33 && code === 60 && this.input.charCodeAt(this.pos + 2) === 45 && this.input.charCodeAt(this.pos + 3) === 45) {
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if (this.inModule) this.unexpected();
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// `<!--`, an XML-style comment that should be interpreted as a line comment
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this.skipLineComment(4);
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this.skipSpace();
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return this.nextToken();
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}
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if (next === 61) {
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size = this.input.charCodeAt(this.pos + 2) === 61 ? 3 : 2;
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}
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return this.finishOp(tt.relational, size);
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}
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readToken_eq_excl(code) { // '=!'
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let next = this.input.charCodeAt(this.pos + 1);
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if (next === 61) return this.finishOp(tt.equality, this.input.charCodeAt(this.pos + 2) === 61 ? 3 : 2);
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if (code === 61 && next === 62) { // '=>'
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this.pos += 2;
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return this.finishToken(tt.arrow);
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}
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return this.finishOp(code === 61 ? tt.eq : tt.prefix, 1);
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}
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getTokenFromCode(code) {
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switch (code) {
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// The interpretation of a dot depends on whether it is followed
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// by a digit or another two dots.
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case 46: // '.'
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return this.readToken_dot();
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// Punctuation tokens.
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case 40: ++this.pos; return this.finishToken(tt.parenL);
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case 41: ++this.pos; return this.finishToken(tt.parenR);
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case 59: ++this.pos; return this.finishToken(tt.semi);
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case 44: ++this.pos; return this.finishToken(tt.comma);
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case 91: ++this.pos; return this.finishToken(tt.bracketL);
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case 93: ++this.pos; return this.finishToken(tt.bracketR);
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case 123: ++this.pos; return this.finishToken(tt.braceL);
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case 125: ++this.pos; return this.finishToken(tt.braceR);
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case 58:
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if (this.options.features["es7.functionBind"] && this.input.charCodeAt(this.pos + 1) === 58) {
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return this.finishOp(tt.doubleColon, 2);
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} else {
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++this.pos;
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return this.finishToken(tt.colon);
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}
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case 63: ++this.pos; return this.finishToken(tt.question);
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case 64: ++this.pos; return this.finishToken(tt.at);
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case 96: // '`'
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++this.pos;
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return this.finishToken(tt.backQuote);
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case 48: // '0'
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let next = this.input.charCodeAt(this.pos + 1);
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if (next === 120 || next === 88) return this.readRadixNumber(16); // '0x', '0X' - hex number
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if (next === 111 || next === 79) return this.readRadixNumber(8); // '0o', '0O' - octal number
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if (next === 98 || next === 66) return this.readRadixNumber(2); // '0b', '0B' - binary number
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// Anything else beginning with a digit is an integer, octal
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// number, or float.
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case 49: case 50: case 51: case 52: case 53: case 54: case 55: case 56: case 57: // 1-9
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return this.readNumber(false);
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// Quotes produce strings.
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case 34: case 39: // '"', "'"
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return this.readString(code);
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// Operators are parsed inline in tiny state machines. '=' (61) is
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// often referred to. `finishOp` simply skips the amount of
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// characters it is given as second argument, and returns a token
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// of the type given by its first argument.
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case 47: // '/'
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return this.readToken_slash();
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case 37: case 42: // '%*'
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return this.readToken_mult_modulo(code);
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case 124: case 38: // '|&'
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return this.readToken_pipe_amp(code);
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case 94: // '^'
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return this.readToken_caret();
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case 43: case 45: // '+-'
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return this.readToken_plus_min(code);
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case 60: case 62: // '<>'
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return this.readToken_lt_gt(code);
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case 61: case 33: // '=!'
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return this.readToken_eq_excl(code);
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case 126: // '~'
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return this.finishOp(tt.prefix, 1);
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}
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this.raise(this.pos, `Unexpected character '${codePointToString(code)}'`);
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}
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finishOp(type, size) {
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let str = this.input.slice(this.pos, this.pos + size);
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this.pos += size;
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return this.finishToken(type, str);
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}
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readRegexp() {
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let escaped, inClass, start = this.pos;
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for (;;) {
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if (this.pos >= this.input.length) this.raise(start, "Unterminated regular expression");
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let ch = this.input.charAt(this.pos);
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if (lineBreak.test(ch)) this.raise(start, "Unterminated regular expression");
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if (escaped) {
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escaped = false;
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} else {
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if (ch === "[") inClass = true;
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else if (ch === "]" && inClass) inClass = false;
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else if (ch === "/" && !inClass) break;
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escaped = ch === "\\";
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}
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++this.pos;
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}
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let content = this.input.slice(start, this.pos);
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++this.pos;
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// Need to use `readWord1` because '\uXXXX' sequences are allowed
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// here (don't ask).
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let mods = this.readWord1();
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let tmp = content;
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if (mods) {
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let validFlags = /^[gmsiyu]*$/;
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if (!validFlags.test(mods)) this.raise(start, "Invalid regular expression flag");
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if (mods.indexOf("u") >= 0 && !regexpUnicodeSupport) {
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// Replace each astral symbol and every Unicode escape sequence that
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// possibly represents an astral symbol or a paired surrogate with a
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// single ASCII symbol to avoid throwing on regular expressions that
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// are only valid in combination with the `/u` flag.
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// Note: replacing with the ASCII symbol `x` might cause false
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// negatives in unlikely scenarios. For example, `[\u{61}-b]` is a
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// perfectly valid pattern that is equivalent to `[a-b]`, but it would
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// be replaced by `[x-b]` which throws an error.
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tmp = tmp.replace(/\\u\{([0-9a-fA-F]+)\}/g, (match, code, offset) => {
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code = Number("0x" + code);
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if (code > 0x10FFFF) this.raise(start + offset + 3, "Code point out of bounds");
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return "x";
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});
|
|
tmp = tmp.replace(/\\u([a-fA-F0-9]{4})|[\uD800-\uDBFF][\uDC00-\uDFFF]/g, "x");
|
|
}
|
|
}
|
|
// Detect invalid regular expressions.
|
|
let value = null;
|
|
// Rhino's regular expression parser is flaky and throws uncatchable exceptions,
|
|
// so don't do detection if we are running under Rhino
|
|
if (!isRhino) {
|
|
tryCreateRegexp.call(this, tmp, undefined, start);
|
|
// Get a regular expression object for this pattern-flag pair, or `null` in
|
|
// case the current environment doesn't support the flags it uses.
|
|
value = tryCreateRegexp.call(this, content, mods);
|
|
}
|
|
return this.finishToken(tt.regexp, {pattern: content, flags: mods, value: value});
|
|
}
|
|
|
|
// Read an integer in the given radix. Return null if zero digits
|
|
// were read, the integer value otherwise. When `len` is given, this
|
|
// will return `null` unless the integer has exactly `len` digits.
|
|
|
|
readInt(radix, len) {
|
|
let start = this.pos, total = 0;
|
|
for (let i = 0, e = len == null ? Infinity : len; i < e; ++i) {
|
|
let code = this.input.charCodeAt(this.pos), val;
|
|
if (code >= 97) val = code - 97 + 10; // a
|
|
else if (code >= 65) val = code - 65 + 10; // A
|
|
else if (code >= 48 && code <= 57) val = code - 48; // 0-9
|
|
else val = Infinity;
|
|
if (val >= radix) break;
|
|
++this.pos;
|
|
total = total * radix + val;
|
|
}
|
|
if (this.pos === start || len != null && this.pos - start !== len) return null;
|
|
|
|
return total;
|
|
}
|
|
|
|
readRadixNumber(radix) {
|
|
this.pos += 2; // 0x
|
|
let val = this.readInt(radix);
|
|
if (val == null) this.raise(this.start + 2, "Expected number in radix " + radix);
|
|
if (isIdentifierStart(this.fullCharCodeAtPos())) this.raise(this.pos, "Identifier directly after number");
|
|
return this.finishToken(tt.num, val);
|
|
}
|
|
|
|
// Read an integer, octal integer, or floating-point number.
|
|
|
|
readNumber(startsWithDot) {
|
|
let start = this.pos, isFloat = false, octal = this.input.charCodeAt(this.pos) === 48;
|
|
if (!startsWithDot && this.readInt(10) === null) this.raise(start, "Invalid number");
|
|
let next = this.input.charCodeAt(this.pos);
|
|
if (next === 46) { // '.'
|
|
++this.pos;
|
|
this.readInt(10);
|
|
isFloat = true;
|
|
next = this.input.charCodeAt(this.pos);
|
|
}
|
|
if (next === 69 || next === 101) { // 'eE'
|
|
next = this.input.charCodeAt(++this.pos);
|
|
if (next === 43 || next === 45) ++this.pos; // '+-'
|
|
if (this.readInt(10) === null) this.raise(start, "Invalid number");
|
|
isFloat = true;
|
|
}
|
|
if (isIdentifierStart(this.fullCharCodeAtPos())) this.raise(this.pos, "Identifier directly after number");
|
|
|
|
let str = this.input.slice(start, this.pos), val;
|
|
if (isFloat) val = parseFloat(str);
|
|
else if (!octal || str.length === 1) val = parseInt(str, 10);
|
|
else if (/[89]/.test(str) || this.strict) this.raise(start, "Invalid number");
|
|
else val = parseInt(str, 8);
|
|
return this.finishToken(tt.num, val);
|
|
}
|
|
|
|
// Read a string value, interpreting backslash-escapes.
|
|
|
|
readCodePoint() {
|
|
let ch = this.input.charCodeAt(this.pos), code;
|
|
|
|
if (ch === 123) {
|
|
let codePos = ++this.pos;
|
|
code = this.readHexChar(this.input.indexOf("}", this.pos) - this.pos);
|
|
++this.pos;
|
|
if (code > 0x10FFFF) this.raise(codePos, "Code point out of bounds");
|
|
} else {
|
|
code = this.readHexChar(4);
|
|
}
|
|
return code;
|
|
}
|
|
|
|
readString(quote) {
|
|
let out = "", chunkStart = ++this.pos;
|
|
for (;;) {
|
|
if (this.pos >= this.input.length) this.raise(this.start, "Unterminated string constant");
|
|
let ch = this.input.charCodeAt(this.pos);
|
|
if (ch === quote) break;
|
|
if (ch === 92) { // '\'
|
|
out += this.input.slice(chunkStart, this.pos);
|
|
out += this.readEscapedChar(false);
|
|
chunkStart = this.pos;
|
|
} else {
|
|
if (isNewLine(ch)) this.raise(this.start, "Unterminated string constant");
|
|
++this.pos;
|
|
}
|
|
}
|
|
out += this.input.slice(chunkStart, this.pos++);
|
|
return this.finishToken(tt.string, out);
|
|
}
|
|
|
|
// Reads template string tokens.
|
|
|
|
readTmplToken() {
|
|
let out = "", chunkStart = this.pos;
|
|
for (;;) {
|
|
if (this.pos >= this.input.length) this.raise(this.start, "Unterminated template");
|
|
let ch = this.input.charCodeAt(this.pos);
|
|
if (ch === 96 || ch === 36 && this.input.charCodeAt(this.pos + 1) === 123) { // '`', '${'
|
|
if (this.pos === this.start && this.type === tt.template) {
|
|
if (ch === 36) {
|
|
this.pos += 2;
|
|
return this.finishToken(tt.dollarBraceL);
|
|
} else {
|
|
++this.pos;
|
|
return this.finishToken(tt.backQuote);
|
|
}
|
|
}
|
|
out += this.input.slice(chunkStart, this.pos);
|
|
return this.finishToken(tt.template, out);
|
|
}
|
|
if (ch === 92) { // '\'
|
|
out += this.input.slice(chunkStart, this.pos);
|
|
out += this.readEscapedChar(true);
|
|
chunkStart = this.pos;
|
|
} else if (isNewLine(ch)) {
|
|
out += this.input.slice(chunkStart, this.pos);
|
|
++this.pos;
|
|
switch (ch) {
|
|
case 13:
|
|
if (this.input.charCodeAt(this.pos) === 10) ++this.pos;
|
|
case 10:
|
|
out += "\n";
|
|
break;
|
|
default:
|
|
out += String.fromCharCode(ch);
|
|
break;
|
|
}
|
|
++this.curLine;
|
|
this.lineStart = this.pos;
|
|
chunkStart = this.pos;
|
|
} else {
|
|
++this.pos;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Used to read escaped characters
|
|
|
|
readEscapedChar(inTemplate) {
|
|
let ch = this.input.charCodeAt(++this.pos);
|
|
++this.pos;
|
|
switch (ch) {
|
|
case 110: return "\n"; // 'n' -> '\n'
|
|
case 114: return "\r"; // 'r' -> '\r'
|
|
case 120: return String.fromCharCode(this.readHexChar(2)); // 'x'
|
|
case 117: return codePointToString(this.readCodePoint()); // 'u'
|
|
case 116: return "\t"; // 't' -> '\t'
|
|
case 98: return "\b"; // 'b' -> '\b'
|
|
case 118: return "\u000b"; // 'v' -> '\u000b'
|
|
case 102: return "\f"; // 'f' -> '\f'
|
|
case 13: if (this.input.charCodeAt(this.pos) === 10) ++this.pos; // '\r\n'
|
|
case 10: // ' \n'
|
|
this.lineStart = this.pos;
|
|
++this.curLine;
|
|
return "";
|
|
default:
|
|
if (ch >= 48 && ch <= 55) {
|
|
let octalStr = this.input.substr(this.pos - 1, 3).match(/^[0-7]+/)[0];
|
|
let octal = parseInt(octalStr, 8);
|
|
if (octal > 255) {
|
|
octalStr = octalStr.slice(0, -1);
|
|
octal = parseInt(octalStr, 8);
|
|
}
|
|
if (octal > 0 && (this.strict || inTemplate)) {
|
|
this.raise(this.pos - 2, "Octal literal in strict mode");
|
|
}
|
|
this.pos += octalStr.length - 1;
|
|
return String.fromCharCode(octal);
|
|
}
|
|
return String.fromCharCode(ch);
|
|
}
|
|
}
|
|
|
|
// Used to read character escape sequences ('\x', '\u', '\U').
|
|
|
|
readHexChar(len) {
|
|
let codePos = this.pos;
|
|
let n = this.readInt(16, len);
|
|
if (n === null) this.raise(codePos, "Bad character escape sequence");
|
|
return n;
|
|
}
|
|
|
|
// Read an identifier, and return it as a string. Sets `containsEsc`
|
|
// to whether the word contained a '\u' escape.
|
|
//
|
|
// Incrementally adds only escaped chars, adding other chunks as-is
|
|
// as a micro-optimization.
|
|
|
|
readWord1() {
|
|
containsEsc = false;
|
|
let word = "", first = true, chunkStart = this.pos;
|
|
while (this.pos < this.input.length) {
|
|
let ch = this.fullCharCodeAtPos();
|
|
if (isIdentifierChar(ch, true)) {
|
|
this.pos += ch <= 0xffff ? 1 : 2;
|
|
} else if (ch === 92) { // "\"
|
|
containsEsc = true;
|
|
|
|
word += this.input.slice(chunkStart, this.pos);
|
|
let escStart = this.pos;
|
|
|
|
if (this.input.charCodeAt(++this.pos) !== 117) { // "u"
|
|
this.raise(this.pos, "Expecting Unicode escape sequence \\uXXXX");
|
|
}
|
|
|
|
++this.pos;
|
|
let esc = this.readCodePoint();
|
|
if (!(first ? isIdentifierStart : isIdentifierChar)(esc, true)) {
|
|
this.raise(escStart, "Invalid Unicode escape");
|
|
}
|
|
|
|
word += codePointToString(esc);
|
|
chunkStart = this.pos;
|
|
} else {
|
|
break;
|
|
}
|
|
first = false;
|
|
}
|
|
return word + this.input.slice(chunkStart, this.pos);
|
|
}
|
|
|
|
// Read an identifier or keyword token. Will check for reserved
|
|
// words when necessary.
|
|
|
|
readWord() {
|
|
let word = this.readWord1();
|
|
let type = tt.name;
|
|
if (!containsEsc && this.isKeyword(word))
|
|
type = keywordTypes[word];
|
|
return this.finishToken(type, word);
|
|
}
|
|
}
|