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codeql-action/node_modules/es-abstract/2021/ArraySetLength.js
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'use strict'; | |
var GetIntrinsic = require('get-intrinsic'); | |
var $RangeError = GetIntrinsic('%RangeError%'); | |
var $TypeError = GetIntrinsic('%TypeError%'); | |
var assign = require('object.assign'); | |
var isPropertyDescriptor = require('../helpers/isPropertyDescriptor'); | |
var IsArray = require('./IsArray'); | |
var IsAccessorDescriptor = require('./IsAccessorDescriptor'); | |
var IsDataDescriptor = require('./IsDataDescriptor'); | |
var OrdinaryDefineOwnProperty = require('./OrdinaryDefineOwnProperty'); | |
var OrdinaryGetOwnProperty = require('./OrdinaryGetOwnProperty'); | |
var ToNumber = require('./ToNumber'); | |
var ToString = require('./ToString'); | |
var ToUint32 = require('./ToUint32'); | |
var Type = require('./Type'); | |
// https://262.ecma-international.org/6.0/#sec-arraysetlength | |
// eslint-disable-next-line max-statements, max-lines-per-function | |
module.exports = function ArraySetLength(A, Desc) { | |
if (!IsArray(A)) { | |
throw new $TypeError('Assertion failed: A must be an Array'); | |
} | |
if (!isPropertyDescriptor({ | |
Type: Type, | |
IsDataDescriptor: IsDataDescriptor, | |
IsAccessorDescriptor: IsAccessorDescriptor | |
}, Desc)) { | |
throw new $TypeError('Assertion failed: Desc must be a Property Descriptor'); | |
} | |
if (!('[[Value]]' in Desc)) { | |
return OrdinaryDefineOwnProperty(A, 'length', Desc); | |
} | |
var newLenDesc = assign({}, Desc); | |
var newLen = ToUint32(Desc['[[Value]]']); | |
var numberLen = ToNumber(Desc['[[Value]]']); | |
if (newLen !== numberLen) { | |
throw new $RangeError('Invalid array length'); | |
} | |
newLenDesc['[[Value]]'] = newLen; | |
var oldLenDesc = OrdinaryGetOwnProperty(A, 'length'); | |
if (!IsDataDescriptor(oldLenDesc)) { | |
throw new $TypeError('Assertion failed: an array had a non-data descriptor on `length`'); | |
} | |
var oldLen = oldLenDesc['[[Value]]']; | |
if (newLen >= oldLen) { | |
return OrdinaryDefineOwnProperty(A, 'length', newLenDesc); | |
} | |
if (!oldLenDesc['[[Writable]]']) { | |
return false; | |
} | |
var newWritable; | |
if (!('[[Writable]]' in newLenDesc) || newLenDesc['[[Writable]]']) { | |
newWritable = true; | |
} else { | |
newWritable = false; | |
newLenDesc['[[Writable]]'] = true; | |
} | |
var succeeded = OrdinaryDefineOwnProperty(A, 'length', newLenDesc); | |
if (!succeeded) { | |
return false; | |
} | |
while (newLen < oldLen) { | |
oldLen -= 1; | |
// eslint-disable-next-line no-param-reassign | |
var deleteSucceeded = delete A[ToString(oldLen)]; | |
if (!deleteSucceeded) { | |
newLenDesc['[[Value]]'] = oldLen + 1; | |
if (!newWritable) { | |
newLenDesc['[[Writable]]'] = false; | |
OrdinaryDefineOwnProperty(A, 'length', newLenDesc); | |
return false; | |
} | |
} | |
} | |
if (!newWritable) { | |
return OrdinaryDefineOwnProperty(A, 'length', { '[[Writable]]': false }); | |
} | |
return true; | |
}; |