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51 lines
2.0 KiB
51 lines
2.0 KiB
'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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