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52 lines
2.0 KiB
Plaintext
52 lines
2.0 KiB
Plaintext
'use strict';
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var $TypeError = require('es-errors/type');
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var GeneratorStart = require('./GeneratorStart');
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var IsArray = require('./IsArray');
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var IsCallable = require('./IsCallable');
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var OrdinaryObjectCreate = require('./OrdinaryObjectCreate');
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var every = require('../helpers/every');
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var SLOT = require('internal-slot');
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var safeConcat = require('safe-array-concat');
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var isObject = require('es-object-atoms/isObject');
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var isString = function isString(slot) {
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return typeof slot === 'string';
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};
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// https://262.ecma-international.org/16.0/#sec-createiteratorfromclosure
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module.exports = function CreateIteratorFromClosure(closure, generatorBrand, generatorPrototype) {
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if (!IsCallable(closure)) {
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throw new $TypeError('`closure` must be a function');
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}
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if (typeof generatorBrand !== 'string') {
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throw new $TypeError('`generatorBrand` must be a string');
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}
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if (!isObject(generatorPrototype)) {
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throw new $TypeError('`generatorPrototype` must be an object');
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}
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var extraSlots = arguments.length > 3 ? arguments[3] : []; // step 2
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if (arguments.length > 3) {
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if (!IsArray(extraSlots) || !every(extraSlots, isString)) {
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throw new $TypeError('`extraSlots` must be a List of String internal slot names');
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}
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}
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var internalSlotsList = safeConcat(extraSlots, ['[[GeneratorContext]]', '[[GeneratorBrand]]', '[[GeneratorState]]']); // step 3
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var generator = OrdinaryObjectCreate(generatorPrototype, internalSlotsList); // steps 4, 6
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SLOT.set(generator, '[[GeneratorBrand]]', generatorBrand); // step 5
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SLOT.set(generator, '[[GeneratorState]]', 'SUSPENDED-START'); // step 6
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SLOT.assert(closure, '[[Sentinel]]'); // our userland slot
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SLOT.set(generator, '[[Sentinel]]', SLOT.get(closure, '[[Sentinel]]')); // our userland slot
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SLOT.assert(closure, '[[CloseIfAbrupt]]'); // our second userland slot
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SLOT.set(generator, '[[CloseIfAbrupt]]', SLOT.get(closure, '[[CloseIfAbrupt]]')); // our second userland slot
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GeneratorStart(generator, closure); // step 14
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return generator; // step 16
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};
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