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LibWeb: Implement TransforStream's constructor

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Kenneth Myhra 2023-07-08 20:10:32 +02:00 • committed by Andreas Kling
parent 7117cb7a35
commit d4f729a6d3
1 changed files with 53 additions and 4 deletions
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57
Userland/Libraries/LibWeb/Streams/TransformStream.cpp
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@ -7,8 +7,10 @@
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Streams/AbstractOperations.h>
#include <LibWeb/Streams/TransformStream.h>
#include <LibWeb/Streams/TransformStreamDefaultController.h>
#include <LibWeb/Streams/Transformer.h>
#include <LibWeb/Streams/WritableStream.h>
#include <LibWeb/WebIDL/AbstractOperations.h>
#include <LibWeb/WebIDL/ExceptionOr.h>
namespace Web::Streams {
@ -16,11 +18,58 @@ namespace Web::Streams {
// https://streams.spec.whatwg.org/#ts-construct
WebIDL::ExceptionOr<JS::NonnullGCPtr<TransformStream>> TransformStream::construct_impl(JS::Realm& realm, Optional<JS::Handle<JS::Object>> transformer_object, QueuingStrategy const& writable_strategy, QueuingStrategy const& readable_strategy)
{
(void)transformer_object;
(void)writable_strategy;
(void)readable_strategy;
auto& vm = realm.vm();
return MUST_OR_THROW_OOM(realm.heap().allocate<TransformStream>(realm, realm));
auto stream = MUST_OR_THROW_OOM(realm.heap().allocate<TransformStream>(realm, realm));
// 1. If transformer is missing, set it to null.
auto transformer = transformer_object.has_value() ? JS::Value { transformer_object.value().ptr() } : JS::js_null();
// 2. Let transformerDict be transformer, converted to an IDL value of type Transformer.
auto transformer_dict = TRY(Transformer::from_value(vm, transformer));
// 3. If transformerDict["readableType"] exists, throw a RangeError exception.
if (transformer_dict.readable_type.has_value())
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::RangeError, "Invalid use of reserved key 'readableType'"sv };
// 4. If transformerDict["writableType"] exists, throw a RangeError exception.
if (transformer_dict.writable_type.has_value())
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::RangeError, "Invalid use of reserved key 'writableType'"sv };
// 5. Let readableHighWaterMark be ? ExtractHighWaterMark(readableStrategy, 0).
auto readable_high_water_mark = TRY(extract_high_water_mark(readable_strategy, 0));
// 6. Let readableSizeAlgorithm be ! ExtractSizeAlgorithm(readableStrategy).
auto readable_size_algorithm = extract_size_algorithm(readable_strategy);
// 7. Let writableHighWaterMark be ? ExtractHighWaterMark(writableStrategy, 1).
auto writable_high_water_mark = TRY(extract_high_water_mark(writable_strategy, 1));
// 8. Let writableSizeAlgorithm be ! ExtractSizeAlgorithm(writableStrategy).
auto writable_size_algorithm = extract_size_algorithm(writable_strategy);
// 9. Let startPromise be a new promise.
auto start_promise = WebIDL::create_promise(realm);
// 10. Perform ! InitializeTransformStream(this, startPromise, writableHighWaterMark, writableSizeAlgorithm,
// readableHighWaterMark, readableSizeAlgorithm).
TRY(initialize_transform_stream(*stream, start_promise, writable_high_water_mark, move(writable_size_algorithm), readable_high_water_mark, move(readable_size_algorithm)));
// 11. Perform ? SetUpTransformStreamDefaultControllerFromTransformer(this, transformer, transformerDict).
TRY(set_up_transform_stream_default_controller_from_transformer(*stream, transformer, transformer_dict));
// 12. If transformerDict["start"] exists, then resolve startPromise with the result of invoking
// transformerDict["start"] with argument list « this.[[controller]] » and callback this value transformer.
if (transformer_dict.start) {
auto result = MUST_OR_THROW_OOM(WebIDL::invoke_callback(*transformer_dict.start, transformer, stream->controller())).release_value();
WebIDL::resolve_promise(realm, start_promise, result);
}
// 13. Otherwise, resolve startPromise with undefined.
else {
WebIDL::resolve_promise(realm, start_promise, JS::js_undefined());
}
return stream;
}
TransformStream::TransformStream(JS::Realm& realm)