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Throw on attempt to delete a private field

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Given that private fields can only be used within classes, any code
using them must be in a strict mode context. As private fields cannot
be deleted, throw an early SyntaxError.
This commit is contained in:
Karl Cheng 2017-06-23 16:10:06 +10:00
parent f976bdd21c
commit 43dba7e7c1
8 changed files with 320 additions and 2 deletions
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12
src/parser/expression.js
View File

@ -252,8 +252,16 @@ export default class ExpressionParser extends LValParser {
if (update) {
this.checkLVal(node.argument, undefined, undefined, "prefix operation");
} else if (this.state.strict && node.operator === "delete" && node.argument.type === "Identifier") {
this.raise(node.start, "Deleting local variable in strict mode");
} else if (this.state.strict && node.operator === "delete") {
const arg = node.argument;
if (arg.type === "Identifier") {
this.raise(node.start, "Deleting local variable in strict mode");
} else if (this.hasPlugin("classPrivateProperties")) {
if (arg.type === "PrivateName" || (arg.type === "MemberExpression" && arg.property.type === "PrivateName")) {
this.raise(node.start, "Deleting a private field is not allowed");
}
}
}
return this.finishNode(node, update ? "UpdateExpression" : "UnaryExpression");

6
test/fixtures/experimental/class-private-properties/delete-non-private/actual.js vendored Normal file
View File

@ -0,0 +1,6 @@
class Foo {
#x;
constructor() {
delete #x.d;
}
}

275
test/fixtures/experimental/class-private-properties/delete-non-private/expected.json vendored Normal file
View File

@ -0,0 +1,275 @@
{
"type": "File",
"start": 0,
"end": 58,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 6,
"column": 1
}
},
"program": {
"type": "Program",
"start": 0,
"end": 58,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 6,
"column": 1
}
},
"sourceType": "script",
"body": [
{
"type": "ClassDeclaration",
"start": 0,
"end": 58,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 6,
"column": 1
}
},
"id": {
"type": "Identifier",
"start": 6,
"end": 9,
"loc": {
"start": {
"line": 1,
"column": 6
},
"end": {
"line": 1,
"column": 9
},
"identifierName": "Foo"
},
"name": "Foo"
},
"superClass": null,
"body": {
"type": "ClassBody",
"start": 10,
"end": 58,
"loc": {
"start": {
"line": 1,
"column": 10
},
"end": {
"line": 6,
"column": 1
}
},
"body": [
{
"type": "ClassPrivateProperty",
"start": 14,
"end": 17,
"loc": {
"start": {
"line": 2,
"column": 2
},
"end": {
"line": 2,
"column": 5
}
},
"key": {
"type": "Identifier",
"start": 15,
"end": 16,
"loc": {
"start": {
"line": 2,
"column": 3
},
"end": {
"line": 2,
"column": 4
},
"identifierName": "x"
},
"name": "x"
},
"value": null
},
{
"type": "ClassMethod",
"start": 20,
"end": 56,
"loc": {
"start": {
"line": 3,
"column": 2
},
"end": {
"line": 5,
"column": 3
}
},
"static": false,
"computed": false,
"key": {
"type": "Identifier",
"start": 20,
"end": 31,
"loc": {
"start": {
"line": 3,
"column": 2
},
"end": {
"line": 3,
"column": 13
},
"identifierName": "constructor"
},
"name": "constructor"
},
"kind": "constructor",
"id": null,
"generator": false,
"expression": false,
"async": false,
"params": [],
"body": {
"type": "BlockStatement",
"start": 34,
"end": 56,
"loc": {
"start": {
"line": 3,
"column": 16
},
"end": {
"line": 5,
"column": 3
}
},
"body": [
{
"type": "ExpressionStatement",
"start": 40,
"end": 52,
"loc": {
"start": {
"line": 4,
"column": 4
},
"end": {
"line": 4,
"column": 16
}
},
"expression": {
"type": "UnaryExpression",
"start": 40,
"end": 51,
"loc": {
"start": {
"line": 4,
"column": 4
},
"end": {
"line": 4,
"column": 15
}
},
"operator": "delete",
"prefix": true,
"argument": {
"type": "MemberExpression",
"start": 47,
"end": 51,
"loc": {
"start": {
"line": 4,
"column": 11
},
"end": {
"line": 4,
"column": 15
}
},
"object": {
"type": "PrivateName",
"start": 48,
"end": 49,
"loc": {
"start": {
"line": 4,
"column": 12
},
"end": {
"line": 4,
"column": 13
}
},
"name": {
"type": "Identifier",
"start": 48,
"end": 49,
"loc": {
"start": {
"line": 4,
"column": 12
},
"end": {
"line": 4,
"column": 13
},
"identifierName": "x"
},
"name": "x"
}
},
"property": {
"type": "Identifier",
"start": 50,
"end": 51,
"loc": {
"start": {
"line": 4,
"column": 14
},
"end": {
"line": 4,
"column": 15
},
"identifierName": "d"
},
"name": "d"
},
"computed": false
},
"extra": {
"parenthesizedArgument": false
}
}
}
],
"directives": []
}
}
]
}
}
],
"directives": []
}
}

3
test/fixtures/experimental/class-private-properties/delete-non-private/options.json vendored Normal file
View File

@ -0,0 +1,3 @@
{
"plugins": ["classProperties", "classPrivateProperties"]
}

6
test/fixtures/experimental/class-private-properties/failure-delete-private-property/actual.js vendored Normal file
View File

@ -0,0 +1,6 @@
class Foo {
#x;
constructor() {
delete this.#x;
}
}

7
test/fixtures/experimental/class-private-properties/failure-delete-private-property/options.json vendored Normal file
View File

@ -0,0 +1,7 @@
{
"throws": "Deleting a private field is not allowed (4:4)",
"plugins": [
"classProperties",
"classPrivateProperties"
]
}

6
test/fixtures/experimental/class-private-properties/failure-delete-shorthand/actual.js vendored Normal file
View File

@ -0,0 +1,6 @@
class Foo {
#x;
constructor() {
delete #x;
}
}

7
test/fixtures/experimental/class-private-properties/failure-delete-shorthand/options.json vendored Normal file
View File

@ -0,0 +1,7 @@
{
"throws": "Deleting a private field is not allowed (4:4)",
"plugins": [
"classProperties",
"classPrivateProperties"
]
}