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Fix strict mode prescanning with EmptyStatement (#9585)

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This commit is contained in:
Daniel Tschinder
2019-02-25 15:20:05 -08:00
committed by GitHub
parent 45c96908e9
commit e6c1065d19
3 changed files with 265 additions and 1 deletions
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11
packages/babel-parser/src/parser/util.js
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@@ -5,7 +5,7 @@ import Tokenizer from "../tokenizer";
import type { Node } from "../types";
import { lineBreak, skipWhiteSpace } from "../util/whitespace";
const literal = /^(?:;|('|")((?:\\?.)*?)\1)/;
const literal = /^('|")((?:\\?.)*?)\1/;
// ## Parser utilities
@@ -170,6 +170,7 @@ export default class UtilParser extends Tokenizer {
strictDirective(start: number): boolean {
for (;;) {
// Try to find string literal.
skipWhiteSpace.lastIndex = start;
// $FlowIgnore
start += skipWhiteSpace.exec(this.state.input)[0].length;
@@ -177,6 +178,14 @@ export default class UtilParser extends Tokenizer {
if (!match) break;
if (match[2] === "use strict") return true;
start += match[0].length;
// Skip semicolon, if any.
skipWhiteSpace.lastIndex = start;
// $FlowIgnore
start += skipWhiteSpace.exec(this.state.input)[0].length;
if (this.state.input[start] === ";") {
start++;
}
}
return false;