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node_modules/es-abstract/2020/CodePointAt.js
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drndsv
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14 апр 2025, 22:53
14 апр 2025, 22:53
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'use strict'; var GetIntrinsic = require('get-intrinsic'); var $TypeError = GetIntrinsic('%TypeError%'); var callBound = require('call-bind/callBound'); var isLeadingSurrogate = require('../helpers/isLeadingSurrogate'); var isTrailingSurrogate = require('../helpers/isTrailingSurrogate'); var Type = require('./Type'); var UTF16DecodeSurrogatePair = require('./UTF16DecodeSurrogatePair'); var $charAt = callBound('String.prototype.charAt'); var $charCodeAt = callBound('String.prototype.charCodeAt'); // https://262.ecma-international.org/11.0/#sec-codepointat module.exports = function CodePointAt(string, position) { if (Type(string) !== 'String') { throw new $TypeError('Assertion failed: `string` must be a String'); } var size = string.length; if (position < 0 || position >= size) { throw new $TypeError('Assertion failed: `position` must be >= 0, and < the length of `string`'); } var first = $charCodeAt(string, position); var cp = $charAt(string, position); var firstIsLeading = isLeadingSurrogate(first); var firstIsTrailing = isTrailingSurrogate(first); if (!firstIsLeading && !firstIsTrailing) { return { '[[CodePoint]]': cp, '[[CodeUnitCount]]': 1, '[[IsUnpairedSurrogate]]': false }; } if (firstIsTrailing || (position + 1 === size)) { return { '[[CodePoint]]': cp, '[[CodeUnitCount]]': 1, '[[IsUnpairedSurrogate]]': true }; } var second = $charCodeAt(string, position + 1); if (!isTrailingSurrogate(second)) { return { '[[CodePoint]]': cp, '[[CodeUnitCount]]': 1, '[[IsUnpairedSurrogate]]': true }; } return { '[[CodePoint]]': UTF16DecodeSurrogatePair(first, second), '[[CodeUnitCount]]': 2, '[[IsUnpairedSurrogate]]': false }; };