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ladybird/Userland/Libraries/LibJS/Runtime/IteratorOperations.h

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LibJS: Start implementing iterable framework, add ArrayIterator With the addition of symbol keys, work can now be done on starting to implement the well-known symbol functionality. The most important of these well-known symbols is by far Symbol.iterator. This patch adds IteratorPrototype, as well as ArrayIterator and ArrayIteratorPrototype. In the future, sometime after StringIterator has also been added, this will allow us to use Symbol.iterator directly in for..of loops, enabling the use of custom iterator objects. Also makes adding iterator support to native objects much easier (as will have to be done for Map and Set, when they get added).
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/*
Userland: Use mattco@serenityos.org for my copyright headers
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* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
LibJS: Start implementing iterable framework, add ArrayIterator With the addition of symbol keys, work can now be done on starting to implement the well-known symbol functionality. The most important of these well-known symbols is by far Symbol.iterator. This patch adds IteratorPrototype, as well as ArrayIterator and ArrayIteratorPrototype. In the future, sometime after StringIterator has also been added, this will allow us to use Symbol.iterator directly in for..of loops, enabling the use of custom iterator objects. Also makes adding iterator support to native objects much easier (as will have to be done for Map and Set, when they get added).
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*
Everything: Move to SPDX license identifiers in all files. SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
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* SPDX-License-Identifier: BSD-2-Clause
LibJS: Start implementing iterable framework, add ArrayIterator With the addition of symbol keys, work can now be done on starting to implement the well-known symbol functionality. The most important of these well-known symbols is by far Symbol.iterator. This patch adds IteratorPrototype, as well as ArrayIterator and ArrayIteratorPrototype. In the future, sometime after StringIterator has also been added, this will allow us to use Symbol.iterator directly in for..of loops, enabling the use of custom iterator objects. Also makes adding iterator support to native objects much easier (as will have to be done for Map and Set, when they get added).
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*/
#pragma once
LibJS: Integrate iterator protocol into language features Finally use Symbol.iterator protocol in language features :) currently only used in for-of loops and spread expressions, but will have more uses later (Maps, Sets, Array.from, etc).
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#include <AK/Function.h>
LibJS: Convert get_iterator_values helper to ThrowCompletionOr This one is a bit unusual, so to clarify: Previously, callers of get_iterator_values() would supply a callback that would return an IterationDecision, and an enum to indicate whether iterator_close() should be invoked upon IterationDecision::Break. Now, use of both those enums is removed, and callers must return an Optional<Completion>. If a Completion is provided, the iterator will be closed, and that completion will be returned from get_iterator_values. Otherwise, once the iterator is exhausted, a default-initialized Completion will be returned.
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#include <AK/Optional.h>
LibJS: Convert GetIterator AO to ThrowCompletionOr
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#include <LibJS/Runtime/Completion.h>
LibJS: Start implementing iterable framework, add ArrayIterator With the addition of symbol keys, work can now be done on starting to implement the well-known symbol functionality. The most important of these well-known symbols is by far Symbol.iterator. This patch adds IteratorPrototype, as well as ArrayIterator and ArrayIteratorPrototype. In the future, sometime after StringIterator has also been added, this will allow us to use Symbol.iterator directly in for..of loops, enabling the use of custom iterator objects. Also makes adding iterator support to native objects much easier (as will have to be done for Map and Set, when they get added).
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#include <LibJS/Runtime/Object.h>
namespace JS {
LibJS: Add ECMA-262 section/title/URL comments almost everywhere As mentioned on Discord earlier, we'll add these to all new functions going forward - this is the backfill. Reasons: - It makes you look at the spec, implementing based on MDN or V8 behavior is a no-go - It makes finding the various functions that are non-compliant easier, in the future everything should either have such a comment or, if it's not from the spec at all, a comment explaining why that is the case - It makes it easier to check whether a certain abstract operation is implemented in LibJS, not all of them use the same name as the spec. E.g. RejectPromise() is Promise::reject() - It makes it easier to reason about vm.arguments(), e.g. when the function has a rest parameter - It makes it easier to see whether a certain function is from a proposal or Annex B Also: - Add arguments to all functions and abstract operations that already had a comment - Fix some outdated section numbers - Replace some ecma-international.org URLs with tc39.es
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// 7.4 Operations on Iterator Objects, https://tc39.es/ecma262/#sec-operations-on-iterator-objects
LibJS: Start implementing iterable framework, add ArrayIterator With the addition of symbol keys, work can now be done on starting to implement the well-known symbol functionality. The most important of these well-known symbols is by far Symbol.iterator. This patch adds IteratorPrototype, as well as ArrayIterator and ArrayIteratorPrototype. In the future, sometime after StringIterator has also been added, this will allow us to use Symbol.iterator directly in for..of loops, enabling the use of custom iterator objects. Also makes adding iterator support to native objects much easier (as will have to be done for Map and Set, when they get added).
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LibJS: Replace iterator hint string argument with an enum There's no reason at all for this to be a string or to accept arbitrary values - just because it's displayed as strings in the spec doesn't mean we have to do the same :^)
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enum class IteratorHint {
Sync,
Async,
};
LibJS: Convert GetIterator AO to ThrowCompletionOr
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ThrowCompletionOr<Object*> get_iterator(GlobalObject&, Value value, IteratorHint hint = IteratorHint::Sync, Value method = {});
LibJS: Convert IteratorNext AO to ThrowCompletionOr
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ThrowCompletionOr<Object*> iterator_next(Object& iterator, Value value = {});
LibJS: Convert IteratorStep AO to ThrowCompletionOr
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ThrowCompletionOr<Object*> iterator_step(GlobalObject&, Object& iterator);
LibJS: Convert IteratorComplete AO to ThrowCompletionOr
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ThrowCompletionOr<bool> iterator_complete(GlobalObject&, Object& iterator_result);
LibJS: Convert IteratorValue AO to ThrowCompletionOr
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ThrowCompletionOr<Value> iterator_value(GlobalObject&, Object& iterator_result);
LibJS: Implement IteratorClose with Completions and align to the spec
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Completion iterator_close(Object& iterator, Completion completion);
LibJS: Change create_iterator_result_object's return type to Object* This always returns an Object, so there's no reason to return a less explicit Value.
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Object* create_iterator_result_object(GlobalObject&, Value value, bool done);
LibJS: Convert IterableToList AO to ThrowCompletionOr
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ThrowCompletionOr<MarkedValueList> iterable_to_list(GlobalObject&, Value iterable, Value method = {});
LibJS: Implement initializing a TypedArray from an iterable object Based on these specifications (which required IterableToList as well): https://tc39.es/ecma262/#sec-typedarray https://tc39.es/ecma262/#sec-initializetypedarrayfromlist
2021-04-16 23:54:41 +03:00
LibJS: Convert get_iterator_values helper to ThrowCompletionOr This one is a bit unusual, so to clarify: Previously, callers of get_iterator_values() would supply a callback that would return an IterationDecision, and an enum to indicate whether iterator_close() should be invoked upon IterationDecision::Break. Now, use of both those enums is removed, and callers must return an Optional<Completion>. If a Completion is provided, the iterator will be closed, and that completion will be returned from get_iterator_values. Otherwise, once the iterator is exhausted, a default-initialized Completion will be returned.
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using IteratorValueCallback = Function<Optional<Completion>(Value)>;
Completion get_iterator_values(GlobalObject& global_object, Value iterable, IteratorValueCallback callback, Value method = {});
LibJS: Integrate iterator protocol into language features Finally use Symbol.iterator protocol in language features :) currently only used in for-of loops and spread expressions, but will have more uses later (Maps, Sets, Array.from, etc).
2020-07-13 08:27:20 -07:00
LibJS: Start implementing iterable framework, add ArrayIterator With the addition of symbol keys, work can now be done on starting to implement the well-known symbol functionality. The most important of these well-known symbols is by far Symbol.iterator. This patch adds IteratorPrototype, as well as ArrayIterator and ArrayIteratorPrototype. In the future, sometime after StringIterator has also been added, this will allow us to use Symbol.iterator directly in for..of loops, enabling the use of custom iterator objects. Also makes adding iterator support to native objects much easier (as will have to be done for Map and Set, when they get added).
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}
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