| 'use strict'; |
| |
| var CodePointAt = require('./CodePointAt'); |
| |
| var $TypeError = require('es-errors/type'); |
| |
| // https://262.ecma-international.org/13.0/#sec-isstringwellformedunicode |
| |
| module.exports = function IsStringWellFormedUnicode(string) { |
| if (typeof string !== 'string') { |
| throw new $TypeError('Assertion failed: `string` must be a String'); |
| } |
| var strLen = string.length; // step 1 |
| var k = 0; // step 2 |
| while (k !== strLen) { // step 3 |
| var cp = CodePointAt(string, k); // step 3.a |
| if (cp['[[IsUnpairedSurrogate]]']) { |
| return false; // step 3.b |
| } |
| k += cp['[[CodeUnitCount]]']; // step 3.c |
| } |
| return true; // step 4 |
| }; |
