'use strict';
|
|
var $TypeError = require('es-errors/type');
|
|
var callBound = require('call-bind/callBound');
|
|
var $charCodeAt = callBound('String.prototype.charCodeAt');
|
var $toUpperCase = callBound('String.prototype.toUpperCase');
|
|
// https://262.ecma-international.org/5.1/#sec-15.10.2.8
|
|
module.exports = function Canonicalize(ch, IgnoreCase) {
|
if (typeof ch !== 'string' || ch.length !== 1) {
|
throw new $TypeError('Assertion failed: `ch` must be a character');
|
}
|
|
if (typeof IgnoreCase !== 'boolean') {
|
throw new $TypeError('Assertion failed: `IgnoreCase` must be a Boolean');
|
}
|
|
if (!IgnoreCase) {
|
return ch; // step 1
|
}
|
|
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;
|
};
|
