103 lines
3.3 KiB
JavaScript
Executable file
103 lines
3.3 KiB
JavaScript
Executable file
'use strict';
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var InternalStateModule = require('../internals/internal-state');
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var createIteratorConstructor = require('../internals/create-iterator-constructor');
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var isObject = require('../internals/is-object');
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var defineProperties = require('../internals/object-define-properties');
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var DESCRIPTORS = require('../internals/descriptors');
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var INCORRECT_RANGE = 'Incorrect Number.range arguments';
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var NUMERIC_RANGE_ITERATOR = 'NumericRangeIterator';
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var setInternalState = InternalStateModule.set;
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var getInternalState = InternalStateModule.getterFor(NUMERIC_RANGE_ITERATOR);
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var $RangeIterator = createIteratorConstructor(function NumericRangeIterator(start, end, option, type, zero, one) {
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if (typeof start != type || (end !== Infinity && end !== -Infinity && typeof end != type)) {
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throw new TypeError(INCORRECT_RANGE);
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}
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if (start === Infinity || start === -Infinity) {
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throw new RangeError(INCORRECT_RANGE);
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}
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var ifIncrease = end > start;
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var inclusiveEnd = false;
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var step;
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if (option === undefined) {
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step = undefined;
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} else if (isObject(option)) {
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step = option.step;
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inclusiveEnd = !!option.inclusive;
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} else if (typeof option == type) {
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step = option;
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} else {
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throw new TypeError(INCORRECT_RANGE);
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}
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if (step == null) {
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step = ifIncrease ? one : -one;
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}
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if (typeof step != type) {
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throw new TypeError(INCORRECT_RANGE);
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}
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if (step === Infinity || step === -Infinity || (step === zero && start !== end)) {
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throw new RangeError(INCORRECT_RANGE);
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}
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// eslint-disable-next-line no-self-compare -- NaN check
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var hitsEnd = start != start || end != end || step != step || (end > start) !== (step > zero);
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setInternalState(this, {
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type: NUMERIC_RANGE_ITERATOR,
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start: start,
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end: end,
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step: step,
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inclusiveEnd: inclusiveEnd,
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hitsEnd: hitsEnd,
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currentCount: zero,
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zero: zero
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});
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if (!DESCRIPTORS) {
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this.start = start;
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this.end = end;
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this.step = step;
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this.inclusive = inclusiveEnd;
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}
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}, NUMERIC_RANGE_ITERATOR, function next() {
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var state = getInternalState(this);
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if (state.hitsEnd) return { value: undefined, done: true };
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var start = state.start;
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var end = state.end;
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var step = state.step;
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var currentYieldingValue = start + (step * state.currentCount++);
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if (currentYieldingValue === end) state.hitsEnd = true;
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var inclusiveEnd = state.inclusiveEnd;
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var endCondition;
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if (end > start) {
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endCondition = inclusiveEnd ? currentYieldingValue > end : currentYieldingValue >= end;
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} else {
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endCondition = inclusiveEnd ? end > currentYieldingValue : end >= currentYieldingValue;
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}
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if (endCondition) {
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return { value: undefined, done: state.hitsEnd = true };
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} return { value: currentYieldingValue, done: false };
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});
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var getter = function (fn) {
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return { get: fn, set: function () { /* empty */ }, configurable: true, enumerable: false };
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};
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if (DESCRIPTORS) {
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defineProperties($RangeIterator.prototype, {
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start: getter(function () {
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return getInternalState(this).start;
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}),
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end: getter(function () {
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return getInternalState(this).end;
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}),
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inclusive: getter(function () {
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return getInternalState(this).inclusiveEnd;
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}),
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step: getter(function () {
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return getInternalState(this).step;
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})
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});
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}
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module.exports = $RangeIterator;
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