47 lines
1.5 KiB
JavaScript
47 lines
1.5 KiB
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
var $TypeError = require('es-errors/type');
|
||
|
|
|
||
|
|
var callBound = require('call-bind/callBound');
|
||
|
|
var $indexOf = callBound('String.prototype.indexOf', true);
|
||
|
|
|
||
|
|
var Canonicalize = require('./Canonicalize');
|
||
|
|
|
||
|
|
var caseFolding = require('../helpers/caseFolding.json');
|
||
|
|
var forEach = require('../helpers/forEach');
|
||
|
|
var OwnPropertyKeys = require('../helpers/OwnPropertyKeys');
|
||
|
|
|
||
|
|
var A = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_'; // step 1
|
||
|
|
|
||
|
|
// https://262.ecma-international.org/8.0/#sec-runtime-semantics-wordcharacters-abstract-operation
|
||
|
|
|
||
|
|
module.exports = function WordCharacters(IgnoreCase, Unicode) {
|
||
|
|
if (typeof IgnoreCase !== 'boolean' || typeof Unicode !== 'boolean') {
|
||
|
|
throw new $TypeError('Assertion failed: `IgnoreCase` and `Unicode` must be booleans');
|
||
|
|
}
|
||
|
|
|
||
|
|
var U = '';
|
||
|
|
forEach(OwnPropertyKeys(caseFolding.C), function (c) {
|
||
|
|
if (
|
||
|
|
$indexOf(A, c) === -1 // c not in A
|
||
|
|
&& $indexOf(A, Canonicalize(c, IgnoreCase, Unicode)) > -1 // canonicalized c IS in A
|
||
|
|
) {
|
||
|
|
U += caseFolding.C[c]; // step 3
|
||
|
|
}
|
||
|
|
});
|
||
|
|
forEach(OwnPropertyKeys(caseFolding.S), function (c) {
|
||
|
|
if (
|
||
|
|
$indexOf(A, c) === -1 // c not in A
|
||
|
|
&& $indexOf(A, Canonicalize(c, IgnoreCase, Unicode)) > -1 // canonicalized c IS in A
|
||
|
|
) {
|
||
|
|
U += caseFolding.S[c]; // step 3
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
if ((!Unicode || !IgnoreCase) && U.length > 0) {
|
||
|
|
throw new $TypeError('Assertion failed: `U` must be empty when `IgnoreCase` and `Unicode` are not both true'); // step 4
|
||
|
|
}
|
||
|
|
|
||
|
|
return A + U; // step 5, 6
|
||
|
|
};
|