'use strict'; var $TypeError = require('es-errors/type'); var callBound = require('call-bind/callBound'); var hasOwn = require('hasown'); var $charCodeAt = callBound('String.prototype.charCodeAt'); var $toUpperCase = callBound('String.prototype.toUpperCase'); var caseFolding = require('../helpers/caseFolding.json'); // https://262.ecma-international.org/6.0/#sec-runtime-semantics-canonicalize-ch module.exports = function Canonicalize(ch, IgnoreCase, Unicode) { if (typeof ch !== 'string') { throw new $TypeError('Assertion failed: `ch` must be a character'); } if (typeof IgnoreCase !== 'boolean' || typeof Unicode !== 'boolean') { throw new $TypeError('Assertion failed: `IgnoreCase` and `Unicode` must be Booleans'); } if (!IgnoreCase) { return ch; // step 1 } if (Unicode) { // step 2 if (hasOwn(caseFolding.C, ch)) { return caseFolding.C[ch]; } if (hasOwn(caseFolding.S, ch)) { return caseFolding.S[ch]; } return ch; // step 2.b } var u = $toUpperCase(ch); // step 2 if (u.length !== 1) { return ch; // step 3 } var cu = u; // step 4 if ($charCodeAt(ch, 0) >= 128 && $charCodeAt(cu, 0) < 128) { return ch; // step 5 } return cu; };