source: frontend/node_modules/es-abstract/2024/CharacterComplement.js

'use strict';

var $TypeError = require('es-errors/type');

var AllCharacters = require('./AllCharacters');

var CharSet = require('../helpers/CharSet').CharSet;
var isRegExpRecord = require('../helpers/records/regexp-record');

// https://262.ecma-international.org/15.0/#sec-charactercomplement

module.exports = function CharacterComplement(rer, S) {
        if (!isRegExpRecord(rer)) {
                throw new $TypeError('Assertion failed: `rer` must be a RegExp Record');
        }

        if (!(S instanceof CharSet)) {
                throw new $TypeError('Assertion failed: S must be a CharSet');
        }

        var A = AllCharacters(rer); // step 1

        // 2. Return the CharSet containing the CharSetElements of A which are not also CharSetElements of S.
        return new CharSet(
                function (x) { return !S.test(x) && A.test(x); },
                function (emit) {
                        A.yield(function (x) {
                                if (!S.test(x)) {
                                        emit(x);
                                }
                        });
                }
        );
};