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codeql-action/node_modules/es-abstract/2015/StringGetIndexProperty.js
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'use strict'; | |
var GetIntrinsic = require('get-intrinsic'); | |
var callBound = require('call-bind/callBound'); | |
var $TypeError = GetIntrinsic('%TypeError%'); | |
var $charAt = callBound('String.prototype.charAt'); | |
var isString = require('is-string'); | |
var isNegativeZero = require('is-negative-zero'); | |
var unbox = require('unbox-primitive'); | |
var CanonicalNumericIndexString = require('./CanonicalNumericIndexString'); | |
var IsInteger = require('./IsInteger'); | |
var IsPropertyKey = require('./IsPropertyKey'); | |
var Type = require('./Type'); | |
// https://262.ecma-international.org/6.0/#sec-stringgetindexproperty | |
module.exports = function StringGetIndexProperty(S, P) { | |
if (typeof S === 'string' || !isString(S)) { | |
throw new $TypeError('Assertion failed: `S` must be a boxed String Object'); | |
} | |
if (!IsPropertyKey(P)) { | |
throw new $TypeError('Assertion failed: `P` must be a Property Key'); | |
} | |
if (Type(P) !== 'String') { | |
return void undefined; | |
} | |
var index = CanonicalNumericIndexString(P); | |
if (typeof index === 'undefined' || !IsInteger(index) || isNegativeZero(index)) { | |
return void undefined; | |
} | |
var str = unbox(S); | |
var len = str.length; | |
if (index < 0 || len <= index) { | |
return void undefined; | |
} | |
var resultStr = $charAt(str, index); | |
return { | |
'[[Configurable]]': false, | |
'[[Enumerable]]': true, | |
'[[Value]]': resultStr, | |
'[[Writable]]': false | |
}; | |
}; |