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codeql-action/node_modules/es-abstract/2019/ValidateAndApplyPropertyDescriptor.js
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'use strict'; | |
var GetIntrinsic = require('get-intrinsic'); | |
var $TypeError = GetIntrinsic('%TypeError%'); | |
var DefineOwnProperty = require('../helpers/DefineOwnProperty'); | |
var isPropertyDescriptor = require('../helpers/isPropertyDescriptor'); | |
var isSamePropertyDescriptor = require('../helpers/isSamePropertyDescriptor'); | |
var FromPropertyDescriptor = require('./FromPropertyDescriptor'); | |
var IsAccessorDescriptor = require('./IsAccessorDescriptor'); | |
var IsDataDescriptor = require('./IsDataDescriptor'); | |
var IsGenericDescriptor = require('./IsGenericDescriptor'); | |
var IsPropertyKey = require('./IsPropertyKey'); | |
var SameValue = require('./SameValue'); | |
var Type = require('./Type'); | |
// https://262.ecma-international.org/6.0/#sec-validateandapplypropertydescriptor | |
// https://262.ecma-international.org/8.0/#sec-validateandapplypropertydescriptor | |
// eslint-disable-next-line max-lines-per-function, max-statements | |
module.exports = function ValidateAndApplyPropertyDescriptor(O, P, extensible, Desc, current) { | |
// this uses the ES2017+ logic, since it fixes a number of bugs in the ES2015 logic. | |
var oType = Type(O); | |
if (oType !== 'Undefined' && oType !== 'Object') { | |
throw new $TypeError('Assertion failed: O must be undefined or an Object'); | |
} | |
if (Type(extensible) !== 'Boolean') { | |
throw new $TypeError('Assertion failed: extensible must be a Boolean'); | |
} | |
if (!isPropertyDescriptor({ | |
Type: Type, | |
IsDataDescriptor: IsDataDescriptor, | |
IsAccessorDescriptor: IsAccessorDescriptor | |
}, Desc)) { | |
throw new $TypeError('Assertion failed: Desc must be a Property Descriptor'); | |
} | |
if (Type(current) !== 'Undefined' && !isPropertyDescriptor({ | |
Type: Type, | |
IsDataDescriptor: IsDataDescriptor, | |
IsAccessorDescriptor: IsAccessorDescriptor | |
}, current)) { | |
throw new $TypeError('Assertion failed: current must be a Property Descriptor, or undefined'); | |
} | |
if (oType !== 'Undefined' && !IsPropertyKey(P)) { | |
throw new $TypeError('Assertion failed: if O is not undefined, P must be a Property Key'); | |
} | |
if (Type(current) === 'Undefined') { | |
if (!extensible) { | |
return false; | |
} | |
if (IsGenericDescriptor(Desc) || IsDataDescriptor(Desc)) { | |
if (oType !== 'Undefined') { | |
DefineOwnProperty( | |
IsDataDescriptor, | |
SameValue, | |
FromPropertyDescriptor, | |
O, | |
P, | |
{ | |
'[[Configurable]]': Desc['[[Configurable]]'], | |
'[[Enumerable]]': Desc['[[Enumerable]]'], | |
'[[Value]]': Desc['[[Value]]'], | |
'[[Writable]]': Desc['[[Writable]]'] | |
} | |
); | |
} | |
} else { | |
if (!IsAccessorDescriptor(Desc)) { | |
throw new $TypeError('Assertion failed: Desc is not an accessor descriptor'); | |
} | |
if (oType !== 'Undefined') { | |
return DefineOwnProperty( | |
IsDataDescriptor, | |
SameValue, | |
FromPropertyDescriptor, | |
O, | |
P, | |
Desc | |
); | |
} | |
} | |
return true; | |
} | |
if (IsGenericDescriptor(Desc) && !('[[Configurable]]' in Desc) && !('[[Enumerable]]' in Desc)) { | |
return true; | |
} | |
if (isSamePropertyDescriptor({ SameValue: SameValue }, Desc, current)) { | |
return true; // removed by ES2017, but should still be correct | |
} | |
// "if every field in Desc is absent, return true" can't really match the assertion that it's a Property Descriptor | |
if (!current['[[Configurable]]']) { | |
if (Desc['[[Configurable]]']) { | |
return false; | |
} | |
if ('[[Enumerable]]' in Desc && !Desc['[[Enumerable]]'] === !!current['[[Enumerable]]']) { | |
return false; | |
} | |
} | |
if (IsGenericDescriptor(Desc)) { | |
// no further validation is required. | |
} else if (IsDataDescriptor(current) !== IsDataDescriptor(Desc)) { | |
if (!current['[[Configurable]]']) { | |
return false; | |
} | |
if (IsDataDescriptor(current)) { | |
if (oType !== 'Undefined') { | |
DefineOwnProperty( | |
IsDataDescriptor, | |
SameValue, | |
FromPropertyDescriptor, | |
O, | |
P, | |
{ | |
'[[Configurable]]': current['[[Configurable]]'], | |
'[[Enumerable]]': current['[[Enumerable]]'], | |
'[[Get]]': undefined | |
} | |
); | |
} | |
} else if (oType !== 'Undefined') { | |
DefineOwnProperty( | |
IsDataDescriptor, | |
SameValue, | |
FromPropertyDescriptor, | |
O, | |
P, | |
{ | |
'[[Configurable]]': current['[[Configurable]]'], | |
'[[Enumerable]]': current['[[Enumerable]]'], | |
'[[Value]]': undefined | |
} | |
); | |
} | |
} else if (IsDataDescriptor(current) && IsDataDescriptor(Desc)) { | |
if (!current['[[Configurable]]'] && !current['[[Writable]]']) { | |
if ('[[Writable]]' in Desc && Desc['[[Writable]]']) { | |
return false; | |
} | |
if ('[[Value]]' in Desc && !SameValue(Desc['[[Value]]'], current['[[Value]]'])) { | |
return false; | |
} | |
return true; | |
} | |
} else if (IsAccessorDescriptor(current) && IsAccessorDescriptor(Desc)) { | |
if (!current['[[Configurable]]']) { | |
if ('[[Set]]' in Desc && !SameValue(Desc['[[Set]]'], current['[[Set]]'])) { | |
return false; | |
} | |
if ('[[Get]]' in Desc && !SameValue(Desc['[[Get]]'], current['[[Get]]'])) { | |
return false; | |
} | |
return true; | |
} | |
} else { | |
throw new $TypeError('Assertion failed: current and Desc are not both data, both accessors, or one accessor and one data.'); | |
} | |
if (oType !== 'Undefined') { | |
return DefineOwnProperty( | |
IsDataDescriptor, | |
SameValue, | |
FromPropertyDescriptor, | |
O, | |
P, | |
Desc | |
); | |
} | |
return true; | |
}; |