source: frontend/node_modules/es-abstract/2025/UpdateModifiers.js

'use strict';

var $TypeError = require('es-errors/type');
var callBound = require('call-bound');
var hasOwn = require('hasown');

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

var $charAt = callBound('String.prototype.charAt');

// https://262.ecma-international.org/16.0/#sec-updatemodifiers

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

        // 1. Assert: add and remove have no elements in common.
        var adds = { __proto__: null };
        var removes = { __proto__: null };
        for (var i = 0; i < add.length; i++) {
                var toAdd = $charAt(add, i);
                adds[toAdd] = true;
        }
        for (var j = 0; j < remove.length; j++) {
                var toRemove = $charAt(remove, j);
                if (hasOwn(adds, toRemove)) {
                        throw new $TypeError('Assertion failed: `add` and `remove` have elements in common');
                }
                removes[toRemove] = true;
        }

        var ignoreCase = rer['[[IgnoreCase]]']; // step 2

        var multiline = rer['[[Multiline]]']; // step 3

        var dotAll = rer['[[DotAll]]']; // step 4

        var unicode = rer['[[Unicode]]']; // step 5

        var unicodeSets = rer['[[UnicodeSets]]']; // step 6

        var capturingGroupsCount = rer['[[CapturingGroupsCount]]']; // step 7

        if (hasOwn(removes, 'i')) {
                ignoreCase = false; // step 8
        } else if (hasOwn(adds, 'i')) {
                ignoreCase = true; // step 9
        }

        if (hasOwn(removes, 'm')) {
                multiline = false; // step 10
        } else if (hasOwn(adds, 'm')) {
                multiline = true; // step 11
        }

        if (hasOwn(removes, 's')) {
                dotAll = false; // step 12
        } else if (hasOwn(adds, 's')) {
                dotAll = true; // step 13
        }

        return {
                '[[IgnoreCase]]': !!ignoreCase,
                '[[Multiline]]': !!multiline,
                '[[DotAll]]': !!dotAll,
                '[[Unicode]]': !!unicode,
                '[[UnicodeSets]]': !!unicodeSets,
                '[[CapturingGroupsCount]]': capturingGroupsCount
        }; // step 14
};