54 lines
1.2 KiB
JavaScript
54 lines
1.2 KiB
JavaScript
'use strict';
|
|
|
|
var GetIntrinsic = require('get-intrinsic');
|
|
|
|
var $TypeError = GetIntrinsic('%TypeError%');
|
|
|
|
var callBound = require('call-bind/callBound');
|
|
var hasOwn = require('hasown');
|
|
|
|
var $charCodeAt = callBound('String.prototype.charCodeAt');
|
|
var $toUpperCase = callBound('String.prototype.toUpperCase');
|
|
|
|
var Type = require('./Type');
|
|
|
|
var assertRecord = require('../helpers/assertRecord');
|
|
var caseFolding = require('../helpers/caseFolding');
|
|
|
|
// https://262.ecma-international.org/14.0/#sec-runtime-semantics-canonicalize-ch
|
|
|
|
module.exports = function Canonicalize(rer, ch) {
|
|
assertRecord(Type, 'RegExp Record', 'rer', rer);
|
|
if (Type(ch) !== 'String') {
|
|
throw new $TypeError('Assertion failed: `ch` must be a character');
|
|
}
|
|
|
|
if (rer['[[Unicode]]'] && rer['[[IgnoreCase]]']) { // step 1
|
|
if (hasOwn(caseFolding.C, ch)) {
|
|
return caseFolding.C[ch];
|
|
}
|
|
if (hasOwn(caseFolding.S, ch)) {
|
|
return caseFolding.S[ch];
|
|
}
|
|
return ch; // step 1.b
|
|
}
|
|
|
|
if (!rer['[[IgnoreCase]]']) {
|
|
return ch; // step 2
|
|
}
|
|
|
|
var u = $toUpperCase(ch); // step 5
|
|
|
|
if (u.length !== 1) {
|
|
return ch; // step 7
|
|
}
|
|
|
|
var cu = u; // step 8
|
|
|
|
if ($charCodeAt(ch, 0) >= 128 && $charCodeAt(cu, 0) < 128) {
|
|
return ch; // step 9
|
|
}
|
|
|
|
return cu; // step 10
|
|
};
|