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23 lines
631 B
23 lines
631 B
'use strict'; |
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var CodePointAt = require('./CodePointAt'); |
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var $TypeError = require('es-errors/type'); |
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// https://262.ecma-international.org/14.0/#sec-isstringwellformedunicode |
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module.exports = function IsStringWellFormedUnicode(string) { |
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if (typeof string !== 'string') { |
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throw new $TypeError('Assertion failed: `string` must be a String'); |
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} |
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var len = string.length; // step 1 |
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var k = 0; // step 2 |
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while (k < len) { // step 3 |
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var cp = CodePointAt(string, k); // step 3.a |
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if (cp['[[IsUnpairedSurrogate]]']) { |
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return false; // step 3.b |
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} |
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k += cp['[[CodeUnitCount]]']; // step 3.c |
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} |
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return true; // step 4 |
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};
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