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- 'use strict';
- var bind = require('../internals/function-bind-context');
- var call = require('../internals/function-call');
- var anObject = require('../internals/an-object');
- var tryToString = require('../internals/try-to-string');
- var isArrayIteratorMethod = require('../internals/is-array-iterator-method');
- var lengthOfArrayLike = require('../internals/length-of-array-like');
- var isPrototypeOf = require('../internals/object-is-prototype-of');
- var getIterator = require('../internals/get-iterator');
- var getIteratorMethod = require('../internals/get-iterator-method');
- var iteratorClose = require('../internals/iterator-close');
-
- var $TypeError = TypeError;
-
- var Result = function (stopped, result) {
- this.stopped = stopped;
- this.result = result;
- };
-
- var ResultPrototype = Result.prototype;
-
- module.exports = function (iterable, unboundFunction, options) {
- var that = options && options.that;
- var AS_ENTRIES = !!(options && options.AS_ENTRIES);
- var IS_RECORD = !!(options && options.IS_RECORD);
- var IS_ITERATOR = !!(options && options.IS_ITERATOR);
- var INTERRUPTED = !!(options && options.INTERRUPTED);
- var fn = bind(unboundFunction, that);
- var iterator, iterFn, index, length, result, next, step;
-
- var stop = function (condition) {
- if (iterator) iteratorClose(iterator, 'normal', condition);
- return new Result(true, condition);
- };
-
- var callFn = function (value) {
- if (AS_ENTRIES) {
- anObject(value);
- return INTERRUPTED ? fn(value[0], value[1], stop) : fn(value[0], value[1]);
- } return INTERRUPTED ? fn(value, stop) : fn(value);
- };
-
- if (IS_RECORD) {
- iterator = iterable.iterator;
- } else if (IS_ITERATOR) {
- iterator = iterable;
- } else {
- iterFn = getIteratorMethod(iterable);
- if (!iterFn) throw new $TypeError(tryToString(iterable) + ' is not iterable');
- // optimisation for array iterators
- if (isArrayIteratorMethod(iterFn)) {
- for (index = 0, length = lengthOfArrayLike(iterable); length > index; index++) {
- result = callFn(iterable[index]);
- if (result && isPrototypeOf(ResultPrototype, result)) return result;
- } return new Result(false);
- }
- iterator = getIterator(iterable, iterFn);
- }
-
- next = IS_RECORD ? iterable.next : iterator.next;
- while (!(step = call(next, iterator)).done) {
- try {
- result = callFn(step.value);
- } catch (error) {
- iteratorClose(iterator, 'throw', error);
- }
- if (typeof result == 'object' && result && isPrototypeOf(ResultPrototype, result)) return result;
- } return new Result(false);
- };
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