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107 lines
3.5 KiB
107 lines
3.5 KiB
'use strict';
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var InternalStateModule = require('../internals/internal-state');
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var createIteratorConstructor = require('../internals/iterator-create-constructor');
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var createIterResultObject = require('../internals/create-iter-result-object');
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var isNullOrUndefined = require('../internals/is-null-or-undefined');
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var isObject = require('../internals/is-object');
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var defineBuiltInAccessor = require('../internals/define-built-in-accessor');
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var DESCRIPTORS = require('../internals/descriptors');
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var INCORRECT_RANGE = 'Incorrect Iterator.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 $RangeError = RangeError;
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var $TypeError = TypeError;
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var $RangeIterator = createIteratorConstructor(function NumericRangeIterator(start, end, option, type, zero, one) {
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// TODO: Drop the first `typeof` check after removing legacy methods in `core-js@4`
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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 (isNullOrUndefined(step)) {
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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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inclusive: 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 createIterResultObject(undefined, 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.inclusive;
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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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state.hitsEnd = true;
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return createIterResultObject(undefined, true);
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} return createIterResultObject(currentYieldingValue, false);
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});
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var addGetter = function (key) {
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defineBuiltInAccessor($RangeIterator.prototype, key, {
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get: function () {
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return getInternalState(this)[key];
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},
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set: function () { /* empty */ },
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configurable: true,
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enumerable: false
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});
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};
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if (DESCRIPTORS) {
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addGetter('start');
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addGetter('end');
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addGetter('inclusive');
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addGetter('step');
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}
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module.exports = $RangeIterator;
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