/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
const hasOwnProperty = Object.prototype.hasOwnProperty;
/**
 * Iterates over each entry in the provided dictionary. The iterator allows
 * to remove elements and will stop when the callback returns {{false}}.
 */
export function forEach(from, callback) {
    for (let key in from) {
        if (hasOwnProperty.call(from, key)) {
            const result = callback({ key: key, value: from[key] }, function () {
                delete from[key];
            });
            if (result === false) {
                return;
            }
        }
    }
}
export class SetMap {
    constructor() {
        this.map = new Map();
    }
    add(key, value) {
        let values = this.map.get(key);
        if (!values) {
            values = new Set();
            this.map.set(key, values);
        }
        values.add(value);
    }
    delete(key, value) {
        const values = this.map.get(key);
        if (!values) {
            return;
        }
        values.delete(value);
        if (values.size === 0) {
            this.map.delete(key);
        }
    }
    forEach(key, fn) {
        const values = this.map.get(key);
        if (!values) {
            return;
        }
        values.forEach(fn);
    }
}