mirror of
https://github.com/RGBCube/serenity
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59 lines
2.2 KiB
C++
59 lines
2.2 KiB
C++
/*
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* Copyright (c) 2023, Matthew Olsson <mattco@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/VM.h>
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#include <LibWeb/HTML/Scripting/Environments.h>
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#include <LibWeb/Streams/UnderlyingSource.h>
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#include <LibWeb/WebIDL/CallbackType.h>
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namespace Web::Streams {
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// Non-standard function to aid in converting a user-provided function into a WebIDL::Callback. This is essentially
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// what the Bindings generator would do at compile time, but at runtime instead.
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static JS::ThrowCompletionOr<JS::Handle<WebIDL::CallbackType>> property_to_callback(JS::VM& vm, JS::Value value, JS::PropertyKey const& property_key)
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{
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auto property = TRY(value.get(vm, property_key));
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if (property.is_undefined())
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return JS::Handle<WebIDL::CallbackType> {};
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if (!property.is_function())
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return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAFunction, TRY_OR_THROW_OOM(vm, property.to_string_without_side_effects()));
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return vm.heap().allocate_without_realm<WebIDL::CallbackType>(property.as_object(), HTML::incumbent_settings_object());
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}
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JS::ThrowCompletionOr<UnderlyingSource> UnderlyingSource::from_value(JS::VM& vm, JS::Value value)
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{
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if (!value.is_object())
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return UnderlyingSource {};
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auto& object = value.as_object();
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UnderlyingSource underlying_source {
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.start = TRY(property_to_callback(vm, value, "start")),
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.pull = TRY(property_to_callback(vm, value, "pull")),
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.cancel = TRY(property_to_callback(vm, value, "cancel")),
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.type = {},
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.auto_allocate_chunk_size = {},
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};
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if (TRY(object.has_property("type"))) {
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auto type_value = TRY(TRY(object.get("type")).to_string(object.vm()));
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if (type_value == "bytes"sv) {
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underlying_source.type = ReadableStreamType::Bytes;
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} else {
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return vm.throw_completion<JS::TypeError>(DeprecatedString::formatted("Unknown stream type '{}'", type_value));
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}
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}
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if (TRY(object.has_property("autoAllocateChunkSize")))
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underlying_source.auto_allocate_chunk_size = TRY(TRY(object.get("autoAllocateChunkSize")).to_bigint_int64(object.vm()));
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return underlying_source;
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}
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}
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