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Fix strict mode prescanning with EmptyStatement (#9585)

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Daniel Tschinder 2019-02-25 15:20:05 -08:00 committed by GitHub
parent 45c96908e9
commit e6c1065d19
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3 changed files with 265 additions and 1 deletions
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11
packages/babel-parser/src/parser/util.js
View File

@ -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;

3
packages/babel-parser/test/fixtures/core/regression/use-strict-with-pre-semi/input.js vendored Normal file
View File

@ -0,0 +1,3 @@
function a ([a] = []) {
; 'use strict'; with ({}) {}
}

252
packages/babel-parser/test/fixtures/core/regression/use-strict-with-pre-semi/output.json vendored Normal file
View File

@ -0,0 +1,252 @@
{
"type": "File",
"start": 0,
"end": 55,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 3,
"column": 1
}
},
"program": {
"type": "Program",
"start": 0,
"end": 55,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 3,
"column": 1
}
},
"sourceType": "script",
"interpreter": null,
"body": [
{
"type": "FunctionDeclaration",
"start": 0,
"end": 55,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 3,
"column": 1
}
},
"id": {
"type": "Identifier",
"start": 9,
"end": 10,
"loc": {
"start": {
"line": 1,
"column": 9
},
"end": {
"line": 1,
"column": 10
},
"identifierName": "a"
},
"name": "a"
},
"generator": false,
"async": false,
"params": [
{
"type": "AssignmentPattern",
"start": 12,
"end": 20,
"loc": {
"start": {
"line": 1,
"column": 12
},
"end": {
"line": 1,
"column": 20
}
},
"left": {
"type": "ArrayPattern",
"start": 12,
"end": 15,
"loc": {
"start": {
"line": 1,
"column": 12
},
"end": {
"line": 1,
"column": 15
}
},
"elements": [
{
"type": "Identifier",
"start": 13,
"end": 14,
"loc": {
"start": {
"line": 1,
"column": 13
},
"end": {
"line": 1,
"column": 14
},
"identifierName": "a"
},
"name": "a"
}
]
},
"right": {
"type": "ArrayExpression",
"start": 18,
"end": 20,
"loc": {
"start": {
"line": 1,
"column": 18
},
"end": {
"line": 1,
"column": 20
}
},
"elements": []
}
}
],
"body": {
"type": "BlockStatement",
"start": 22,
"end": 55,
"loc": {
"start": {
"line": 1,
"column": 22
},
"end": {
"line": 3,
"column": 1
}
},
"body": [
{
"type": "EmptyStatement",
"start": 25,
"end": 26,
"loc": {
"start": {
"line": 2,
"column": 1
},
"end": {
"line": 2,
"column": 2
}
}
},
{
"type": "ExpressionStatement",
"start": 27,
"end": 40,
"loc": {
"start": {
"line": 2,
"column": 3
},
"end": {
"line": 2,
"column": 16
}
},
"expression": {
"type": "StringLiteral",
"start": 27,
"end": 39,
"loc": {
"start": {
"line": 2,
"column": 3
},
"end": {
"line": 2,
"column": 15
}
},
"extra": {
"rawValue": "use strict",
"raw": "'use strict'"
},
"value": "use strict"
}
},
{
"type": "WithStatement",
"start": 41,
"end": 53,
"loc": {
"start": {
"line": 2,
"column": 17
},
"end": {
"line": 2,
"column": 29
}
},
"object": {
"type": "ObjectExpression",
"start": 47,
"end": 49,
"loc": {
"start": {
"line": 2,
"column": 23
},
"end": {
"line": 2,
"column": 25
}
},
"properties": []
},
"body": {
"type": "BlockStatement",
"start": 51,
"end": 53,
"loc": {
"start": {
"line": 2,
"column": 27
},
"end": {
"line": 2,
"column": 29
}
},
"body": [],
"directives": []
}
}
],
"directives": []
}
}
],
"directives": []
}
}