# all files / TypeScript.NET/source/System/Collections/Enumeration/ Enumerator.js

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     /*!
     * @author electricessence / https://github.com/electricessence/
     * Licensing: MIT https://github.com/electricessence/TypeScript.NET/blob/master/LICENSE.md
     */
    (function (factory) {
        Eif (typeof module === 'object' && typeof module.exports === 'object') {
            var v = factory(require, exports); Iif (v !== undefined) module.exports = v;
        }
        else if (typeof define === 'function' && define.amd) {
            define(["require", "exports", "../../Disposable/dispose", "../../Types", "./ArrayEnumerator", "./IndexEnumerator", "./UnsupportedEnumerableException", "./InfiniteEnumerator", "./EmptyEnumerator", "./IteratorEnumerator"], factory);
        }
    })(function (require, exports) {
        "use strict";
        var dispose_1 = require("../../Disposable/dispose");
        var Types_1 = require("../../Types");
        var ArrayEnumerator_1 = require("./ArrayEnumerator");
        var IndexEnumerator_1 = require("./IndexEnumerator");
        var UnsupportedEnumerableException_1 = require("./UnsupportedEnumerableException");
        var InfiniteEnumerator_1 = require("./InfiniteEnumerator");
        var EmptyEnumerator_1 = require("./EmptyEnumerator");
        var IteratorEnumerator_1 = require("./IteratorEnumerator");
        var VOID0 = void (0), STRING_EMPTY = "", ENDLESS_EXCEPTION_MESSAGE = 'Cannot call forEach on an endless enumerable. ' +
            'Would result in an infinite loop that could hang the current process.';
        function throwIfEndless(isEndless) {
            Iif (isEndless)
                throw new UnsupportedEnumerableException_1.UnsupportedEnumerableException(ENDLESS_EXCEPTION_MESSAGE);
        }
        exports.throwIfEndless = throwIfEndless;
        function initArrayFrom(source, max) {
            if (max === void 0) { max = Infinity; }
            if (Array.isArray(source) || Types_1.Type.isString(source)) {
                var len = Math.min(source.length, max);
                if (isFinite(len)) {
                    if (len > 65535)
                        return new Array(len);
                    var result = [];
                    result.length = len;
                    return result;
                }
            }
            return [];
        }
        function from(source) {
            if (!source)
                return EmptyEnumerator_1.EmptyEnumerator;
            if (Array.isArray(source))
                return new ArrayEnumerator_1.ArrayEnumerator(source);
            if (Types_1.Type.isArrayLike(source)) {
                return new IndexEnumerator_1.IndexEnumerator(function () {
                    return {
                        source: source,
                        length: source.length,
                        pointer: 0,
                        step: 1
                    };
                });
            }
            if (!Types_1.Type.isPrimitive(source)) {
                if (isEnumerable(source))
                    return source.getEnumerator();
                if (Types_1.Type.isFunction(source))
                    return new InfiniteEnumerator_1.InfiniteEnumerator(source);
                Iif (isIterator(source))
                    return new IteratorEnumerator_1.IteratorEnumerator(source);
            }
            throw new UnsupportedEnumerableException_1.UnsupportedEnumerableException();
        }
        exports.from = from;
        function isEnumerable(instance) {
            return Types_1.Type.hasMemberOfType(instance, "getEnumerator", Types_1.Type.FUNCTION);
        }
        exports.isEnumerable = isEnumerable;
        function isEnumerableOrArrayLike(instance) {
            return Types_1.Type.isArrayLike(instance) || isEnumerable(instance);
        }
        exports.isEnumerableOrArrayLike = isEnumerableOrArrayLike;
        function isEnumerator(instance) {
            return Types_1.Type.hasMemberOfType(instance, "moveNext", Types_1.Type.FUNCTION);
        }
        exports.isEnumerator = isEnumerator;
        function isIterator(instance) {
            return Types_1.Type.hasMemberOfType(instance, "next", Types_1.Type.FUNCTION);
        }
        exports.isIterator = isIterator;
        function forEach(e, action, max) {
            if (max === void 0) { max = Infinity; }
            Iif (e === STRING_EMPTY)
                return 0;
            if (e && max > 0) {
                if (Types_1.Type.isArrayLike(e)) {
                    throwIfEndless(!isFinite(max) && !isFinite(e.length));
                    var i = 0;
                    for (; i < Math.min(e.length, max); i++) {
                        if (action(e[i], i) === false)
                            break;
                    }
                    return i;
                }
                if (isEnumerator(e)) {
                    throwIfEndless(!isFinite(max) && e.isEndless);
                    var i = 0;
                    while (max > i && e.moveNext()) {
                        if (action(e.current, i++) === false)
                            break;
                    }
                    return i;
                }
                if (isEnumerable(e)) {
                    throwIfEndless(!isFinite(max) && e.isEndless);
                    return dispose_1.using(e.getEnumerator(), function (f) { return forEach(f, action, max); });
                }
                Iif (isIterator(e)) {
                    throwIfEndless(!isFinite(max));
                    var i = 0, r = void 0;
                    while (max > i && !(r = e.next()).done) {
                        if (action(r.value, i++) === false)
                            break;
                    }
                    return i;
                }
            }
            return -1;
        }
        exports.forEach = forEach;
        function toArray(source, max) {
            Eif (max === void 0) { max = Infinity; }
            Iif (source === STRING_EMPTY)
                return [];
            Eif (!isFinite(max) && Array.isArray(source))
                return source.slice();
            var result = initArrayFrom(source, max);
            if (-1 === forEach(source, function (e, i) { result[i] = e; }, max))
                throw new UnsupportedEnumerableException_1.UnsupportedEnumerableException();
            return result;
        }
        exports.toArray = toArray;
        function map(source, selector, max) {
            if (max === void 0) { max = Infinity; }
            if (source === STRING_EMPTY)
                return [];
            if (!isFinite(max) && Array.isArray(source))
                return source.map(selector);
            var result = initArrayFrom(source, max);
            if (-1 === forEach(source, function (e, i) { result[i] = selector(e); }, max))
                throw new UnsupportedEnumerableException_1.UnsupportedEnumerableException();
            return result;
        }
        exports.map = map;
    });
    //# sourceMappingURL=Enumerator.js.map