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codeql-action/node_modules/es-abstract/2022/ValidateAndApplyPropertyDescriptor.js
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'use strict'; | |
var GetIntrinsic = require('get-intrinsic'); | |
var $TypeError = GetIntrinsic('%TypeError%'); | |
var DefineOwnProperty = require('../helpers/DefineOwnProperty'); | |
var isFullyPopulatedPropertyDescriptor = require('../helpers/isFullyPopulatedPropertyDescriptor'); | |
var isPropertyDescriptor = require('../helpers/isPropertyDescriptor'); | |
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/13.0/#sec-validateandapplypropertydescriptor | |
// see https://github.com/tc39/ecma262/pull/2468 for ES2022 changes | |
// eslint-disable-next-line max-lines-per-function, max-statements | |
module.exports = function ValidateAndApplyPropertyDescriptor(O, P, extensible, Desc, current) { | |
var oType = Type(O); | |
if (oType !== 'Undefined' && oType !== 'Object') { | |
throw new $TypeError('Assertion failed: O must be undefined or an Object'); | |
} | |
if (!IsPropertyKey(P)) { | |
throw new $TypeError('Assertion failed: P must be a Property Key'); | |
} | |
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 (Type(current) === 'Undefined') { // step 2 | |
if (!extensible) { | |
return false; // step 2.a | |
} | |
if (oType === 'Undefined') { | |
return true; // step 2.b | |
} | |
if (IsAccessorDescriptor(Desc)) { // step 2.c | |
return DefineOwnProperty( | |
IsDataDescriptor, | |
SameValue, | |
FromPropertyDescriptor, | |
O, | |
P, | |
Desc | |
); | |
} | |
// step 2.d | |
return DefineOwnProperty( | |
IsDataDescriptor, | |
SameValue, | |
FromPropertyDescriptor, | |
O, | |
P, | |
{ | |
'[[Configurable]]': !!Desc['[[Configurable]]'], | |
'[[Enumerable]]': !!Desc['[[Enumerable]]'], | |
'[[Value]]': Desc['[[Value]]'], | |
'[[Writable]]': !!Desc['[[Writable]]'] | |
} | |
); | |
} | |
// 3. Assert: current is a fully populated Property Descriptor. | |
if (!isFullyPopulatedPropertyDescriptor({ | |
IsAccessorDescriptor: IsAccessorDescriptor, | |
IsDataDescriptor: IsDataDescriptor | |
}, current)) { | |
throw new $TypeError('`current`, when present, must be a fully populated and valid Property Descriptor'); | |
} | |
// 4. If every field in Desc is absent, return true. | |
// this can't really match the assertion that it's a Property Descriptor in our JS implementation | |
// 5. If current.[[Configurable]] is false, then | |
if (!current['[[Configurable]]']) { | |
if ('[[Configurable]]' in Desc && Desc['[[Configurable]]']) { | |
// step 5.a | |
return false; | |
} | |
if ('[[Enumerable]]' in Desc && !SameValue(Desc['[[Enumerable]]'], current['[[Enumerable]]'])) { | |
// step 5.b | |
return false; | |
} | |
if (!IsGenericDescriptor(Desc) && !SameValue(IsAccessorDescriptor(Desc), IsAccessorDescriptor(current))) { | |
// step 5.c | |
return false; | |
} | |
if (IsAccessorDescriptor(current)) { // step 5.d | |
if ('[[Get]]' in Desc && !SameValue(Desc['[[Get]]'], current['[[Get]]'])) { | |
return false; | |
} | |
if ('[[Set]]' in Desc && !SameValue(Desc['[[Set]]'], current['[[Set]]'])) { | |
return false; | |
} | |
} else if (!current['[[Writable]]']) { // step 5.e | |
if ('[[Writable]]' in Desc && Desc['[[Writable]]']) { | |
return false; | |
} | |
if ('[[Value]]' in Desc && !SameValue(Desc['[[Value]]'], current['[[Value]]'])) { | |
return false; | |
} | |
} | |
} | |
// 6. If O is not undefined, then | |
if (oType !== 'Undefined') { | |
var configurable; | |
var enumerable; | |
if (IsDataDescriptor(current) && IsAccessorDescriptor(Desc)) { // step 6.a | |
configurable = ('[[Configurable]]' in Desc ? Desc : current)['[[Configurable]]']; | |
enumerable = ('[[Enumerable]]' in Desc ? Desc : current)['[[Enumerable]]']; | |
// Replace the property named P of object O with an accessor property having [[Configurable]] and [[Enumerable]] attributes as described by current and each other attribute set to its default value. | |
return DefineOwnProperty( | |
IsDataDescriptor, | |
SameValue, | |
FromPropertyDescriptor, | |
O, | |
P, | |
{ | |
'[[Configurable]]': !!configurable, | |
'[[Enumerable]]': !!enumerable, | |
'[[Get]]': ('[[Get]]' in Desc ? Desc : current)['[[Get]]'], | |
'[[Set]]': ('[[Set]]' in Desc ? Desc : current)['[[Set]]'] | |
} | |
); | |
} else if (IsAccessorDescriptor(current) && IsDataDescriptor(Desc)) { | |
configurable = ('[[Configurable]]' in Desc ? Desc : current)['[[Configurable]]']; | |
enumerable = ('[[Enumerable]]' in Desc ? Desc : current)['[[Enumerable]]']; | |
// i. Replace the property named P of object O with a data property having [[Configurable]] and [[Enumerable]] attributes as described by current and each other attribute set to its default value. | |
return DefineOwnProperty( | |
IsDataDescriptor, | |
SameValue, | |
FromPropertyDescriptor, | |
O, | |
P, | |
{ | |
'[[Configurable]]': !!configurable, | |
'[[Enumerable]]': !!enumerable, | |
'[[Value]]': ('[[Value]]' in Desc ? Desc : current)['[[Value]]'], | |
'[[Writable]]': !!('[[Writable]]' in Desc ? Desc : current)['[[Writable]]'] | |
} | |
); | |
} | |
// For each field of Desc that is present, set the corresponding attribute of the property named P of object O to the value of the field. | |
return DefineOwnProperty( | |
IsDataDescriptor, | |
SameValue, | |
FromPropertyDescriptor, | |
O, | |
P, | |
Desc | |
); | |
} | |
return true; // step 7 | |
}; |