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LibWeb: Add UnderlyingSource struct for ReadableStream constructor

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Matthew Olsson 2023-03-28 18:58:41 -07:00 • committed by Linus Groh
parent bc9919178e
commit 66dec1bf54
4 changed files with 92 additions and 0 deletions
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59
Userland/Libraries/LibWeb/Streams/UnderlyingSource.cpp Normal file
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/*
* Copyright (c) 2023, Matthew Olsson <mattco@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Runtime/VM.h>
#include <LibWeb/HTML/Scripting/Environments.h>
#include <LibWeb/Streams/UnderlyingSource.h>
#include <LibWeb/WebIDL/CallbackType.h>
namespace Web::Streams {
// Non-standard function to aid in converting a user-provided function into a WebIDL::Callback. This is essentially
// what the Bindings generator would do at compile time, but at runtime instead.
static JS::ThrowCompletionOr<JS::Handle<WebIDL::CallbackType>> property_to_callback(JS::VM& vm, JS::Value value, JS::PropertyKey const& property_key)
{
auto property = TRY(value.get(vm, property_key));
if (property.is_undefined())
return JS::Handle<WebIDL::CallbackType> {};
if (!property.is_function())
return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAFunction, TRY_OR_THROW_OOM(vm, property.to_string_without_side_effects()));
return vm.heap().allocate_without_realm<WebIDL::CallbackType>(property.as_object(), HTML::incumbent_settings_object());
}
JS::ThrowCompletionOr<UnderlyingSource> UnderlyingSource::from_value(JS::VM& vm, JS::Value value)
{
if (!value.is_object())
return UnderlyingSource {};
auto& object = value.as_object();
UnderlyingSource underlying_source {
.start = TRY(property_to_callback(vm, value, "start")),
.pull = TRY(property_to_callback(vm, value, "pull")),
.cancel = TRY(property_to_callback(vm, value, "cancel")),
.type = {},
.auto_allocate_chunk_size = {},
};
if (TRY(object.has_property("type"))) {
auto type_value = TRY(TRY(object.get("type")).to_string(object.vm()));
if (type_value == "bytes"sv) {
underlying_source.type = ReadableStreamType::Bytes;
} else {
return vm.throw_completion<JS::TypeError>(DeprecatedString::formatted("Unknown stream type '{}'", type_value));
}
}
if (TRY(object.has_property("autoAllocateChunkSize")))
underlying_source.auto_allocate_chunk_size = TRY(TRY(object.get("autoAllocateChunkSize")).to_bigint_int64(object.vm()));
return underlying_source;
}
}