"use strict";
var __generator = (this && this.__generator) || function (thisArg, body) {
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};
var __values = (this && this.__values) || function(o) {
    var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
    if (m) return m.call(o);
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};
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Represents a set of objects with a size limit.
 */
var FixedSizeSet = /** @class */ (function () {
    /**
     * Initializes a new instance of `FixedSizeSet`.
     *
     * @param limit - maximum number of items to keep in the set. When the limit
     * is exceeded the first item is removed from the set.
     */
    function FixedSizeSet(limit) {
        if (limit === void 0) { limit = 1000; }
        this._items = new Set();
        this._limit = limit;
    }
    /**
     * Adds a new item to the set.
     *
     * @param item - an item
     */
    FixedSizeSet.prototype.add = function (item) {
        this._items.add(item);
        if (this._items.size > this._limit) {
            var it_1 = this._items.values().next();
            /* istanbul ignore else */
            if (!it_1.done) {
                this._items.delete(it_1.value);
            }
        }
        return this;
    };
    /**
     * Removes an item from the set.
     *
     * @param item - an item
     */
    FixedSizeSet.prototype.delete = function (item) {
        return this._items.delete(item);
    };
    /**
     * Determines if an item is in the set.
     *
     * @param item - an item
     */
    FixedSizeSet.prototype.has = function (item) {
        return this._items.has(item);
    };
    /**
     * Removes all items from the set.
     */
    FixedSizeSet.prototype.clear = function () {
        this._items.clear();
    };
    Object.defineProperty(FixedSizeSet.prototype, "size", {
        /**
         * Gets the number of items in the set.
         */
        get: function () { return this._items.size; },
        enumerable: true,
        configurable: true
    });
    /**
     * Applies the given callback function to all elements of the set.
     */
    FixedSizeSet.prototype.forEach = function (callback, thisArg) {
        var _this = this;
        this._items.forEach(function (e) { return callback.call(thisArg, e, e, _this); });
    };
    /**
     * Iterates through the items in the set.
     */
    FixedSizeSet.prototype.keys = function () {
        return __generator(this, function (_a) {
            switch (_a.label) {
                case 0: return [5 /*yield**/, __values(this._items.keys())];
                case 1:
                    _a.sent();
                    return [2 /*return*/];
            }
        });
    };
    /**
     * Iterates through the items in the set.
     */
    FixedSizeSet.prototype.values = function () {
        return __generator(this, function (_a) {
            switch (_a.label) {
                case 0: return [5 /*yield**/, __values(this._items.values())];
                case 1:
                    _a.sent();
                    return [2 /*return*/];
            }
        });
    };
    /**
     * Iterates through the items in the set.
     */
    FixedSizeSet.prototype.entries = function () {
        return __generator(this, function (_a) {
            switch (_a.label) {
                case 0: return [5 /*yield**/, __values(this._items.entries())];
                case 1:
                    _a.sent();
                    return [2 /*return*/];
            }
        });
    };
    /**
     * Iterates through the items in the set.
     */
    FixedSizeSet.prototype[Symbol.iterator] = function () {
        return __generator(this, function (_a) {
            switch (_a.label) {
                case 0: return [5 /*yield**/, __values(this._items)];
                case 1:
                    _a.sent();
                    return [2 /*return*/];
            }
        });
    };
    Object.defineProperty(FixedSizeSet.prototype, Symbol.toStringTag, {
        /**
         * Returns the string tag of the set.
         */
        get: function () {
            return "FixedSizeSet";
        },
        enumerable: true,
        configurable: true
    });
    return FixedSizeSet;
}());
exports.FixedSizeSet = FixedSizeSet;
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