49 lines
1.6 KiB
Plaintext
49 lines
1.6 KiB
Plaintext
'use strict';
|
|
|
|
var GetIntrinsic = require('get-intrinsic');
|
|
|
|
var $TypeError = GetIntrinsic('%TypeError%');
|
|
|
|
var callBound = require('call-bind/callBound');
|
|
var $indexOf = callBound('String.prototype.indexOf', true);
|
|
|
|
var Canonicalize = require('./Canonicalize');
|
|
var Type = require('./Type');
|
|
|
|
var assertRecord = require('../helpers/assertRecord');
|
|
var caseFolding = require('../helpers/caseFolding');
|
|
var forEach = require('../helpers/forEach');
|
|
var OwnPropertyKeys = require('../helpers/OwnPropertyKeys');
|
|
|
|
var basicWordChars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_'; // step 1
|
|
|
|
// https://262.ecma-international.org/14.0/#sec-runtime-semantics-wordcharacters-abstract-operation
|
|
|
|
module.exports = function WordCharacters(rer) {
|
|
assertRecord(Type, 'RegExp Record', 'rer', rer);
|
|
|
|
var extraWordChars = '';
|
|
forEach(OwnPropertyKeys(caseFolding.C), function (c) {
|
|
if (
|
|
$indexOf(basicWordChars, c) === -1 // c not in A
|
|
&& $indexOf(basicWordChars, Canonicalize(rer, c)) > -1 // canonicalized c IS in A
|
|
) {
|
|
extraWordChars += caseFolding.C[c]; // step 3
|
|
}
|
|
});
|
|
forEach(OwnPropertyKeys(caseFolding.S), function (c) {
|
|
if (
|
|
$indexOf(basicWordChars, c) === -1 // c not in A
|
|
&& $indexOf(basicWordChars, Canonicalize(rer, c)) > -1 // canonicalized c IS in A
|
|
) {
|
|
extraWordChars += caseFolding.S[c]; // step 3
|
|
}
|
|
});
|
|
|
|
if ((!rer['[[Unicode]]'] || !rer['[[IgnoreCase]]']) && extraWordChars.length > 0) {
|
|
throw new $TypeError('Assertion failed: `extraWordChars` must be empty when `rer.[[IgnoreCase]]` and `rer.[[Unicode]]` are not both true'); // step 3
|
|
}
|
|
|
|
return basicWordChars + extraWordChars; // step 4
|
|
};
|