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https://github.com/LadybirdBrowser/ladybird.git
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a6dfc74e93
Before this change, we were going through the chain of base classes for each IDL interface object and having them set the prototype to their prototype. Instead of doing that, reorder things so that we set the right prototype immediately in Foo::initialize(), and then don't bother in all the base class overrides. This knocks off a ~1% profile item on Speedometer 3.
116 lines
4.3 KiB
C++
116 lines
4.3 KiB
C++
/*
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* Copyright (c) 2021-2022, Linus Groh <linusg@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/TypedArray.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/Bindings/TextEncoderPrototype.h>
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#include <LibWeb/Encoding/TextEncoder.h>
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#include <LibWeb/WebIDL/ExceptionOr.h>
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namespace Web::Encoding {
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GC_DEFINE_ALLOCATOR(TextEncoder);
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WebIDL::ExceptionOr<GC::Ref<TextEncoder>> TextEncoder::construct_impl(JS::Realm& realm)
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{
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return realm.create<TextEncoder>(realm);
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}
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TextEncoder::TextEncoder(JS::Realm& realm)
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: PlatformObject(realm)
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{
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}
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TextEncoder::~TextEncoder() = default;
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void TextEncoder::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(TextEncoder);
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Base::initialize(realm);
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}
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// https://encoding.spec.whatwg.org/#dom-textencoder-encode
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GC::Ref<JS::Uint8Array> TextEncoder::encode(String const& input) const
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{
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// NOTE: The AK::String is always UTF-8, so most of these steps are no-ops.
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// 1. Convert input to an I/O queue of scalar values.
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// 2. Let output be the I/O queue of bytes « end-of-queue ».
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// 3. While true:
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// 1. Let item be the result of reading from input.
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// 2. Let result be the result of processing an item with item, an instance of the UTF-8 encoder, input, output, and "fatal".
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// 3. Assert: result is not an error.
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// 4. If result is finished, then convert output into a byte sequence and return a Uint8Array object wrapping an ArrayBuffer containing output.
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auto byte_buffer = MUST(ByteBuffer::copy(input.bytes()));
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auto array_length = byte_buffer.size();
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auto array_buffer = JS::ArrayBuffer::create(realm(), move(byte_buffer));
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return JS::Uint8Array::create(realm(), array_length, *array_buffer);
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}
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// https://encoding.spec.whatwg.org/#dom-textencoder-encodeinto
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TextEncoderEncodeIntoResult TextEncoder::encode_into(String const& source, GC::Root<WebIDL::BufferSource> const& destination) const
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{
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// AD-HOC: Return early if destination is detached. This is not explicitly handled in the spec,
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// however no bytes are copied as destinations size is always zero in this case.
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// See: https://github.com/whatwg/encoding/issues/324
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if (destination->viewed_array_buffer()->is_detached())
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return { 0, 0 };
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auto data = destination->viewed_array_buffer()->buffer().bytes().slice(destination->byte_offset(), destination->byte_length());
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// 1. Let read be 0.
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WebIDL::UnsignedLongLong read = 0;
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// 2. Let written be 0.
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WebIDL::UnsignedLongLong written = 0;
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// NOTE: The AK::String is always UTF-8, so most of these steps are no-ops.
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// 3. Let encoder be an instance of the UTF-8 encoder.
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// 4. Let unused be the I/O queue of scalar values « end-of-queue ».
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// 5. Convert source to an I/O queue of scalar values.
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auto code_points = source.code_points();
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auto it = code_points.begin();
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// 6. While true:
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while (true) {
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// 6.1. Let item be the result of reading from source.
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// 6.2. Let result be the result of running encoder’s handler on unused and item.
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// 6.3. If result is finished, then break.
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if (it.done())
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break;
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auto item = *it;
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auto result = it.underlying_code_point_bytes();
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// 6.4. Otherwise:
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// 6.4.1. If destination’s byte length − written is greater than or equal to the number of bytes in result, then:
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if (destination->byte_length() - written >= result.size()) {
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// 6.4.1.1. If item is greater than U+FFFF, then increment read by 2.
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if (item > 0xffff) {
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read += 2;
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}
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// 6.4.1.2. Otherwise, increment read by 1.
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else {
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read++;
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}
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// 6.4.1.3. Write the bytes in result into destination, with startingOffset set to written.
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// 6.4.1.4. Increment written by the number of bytes in result.
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// WARNING: See the warning for SharedArrayBuffer objects at https://encoding.spec.whatwg.org/#sharedarraybuffer-warning.
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for (auto byte : result)
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data[written++] = byte;
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}
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// 6.4.2. Otherwise, break.
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else {
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break;
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}
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++it;
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}
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// 7. Return «[ "read" → read, "written" → written ]».
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return { read, written };
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}
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}
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