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LibWeb: Bring TextDecoder constructor closer to spec

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(cherry picked from commit 987910ad0f9978a9a618d13b3e1d299a81ce4906)
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Simon Wanner 2024-05-30 20:44:41 +02:00 committed by Nico Weber
parent 98a5fff68b
commit 30609289b5
1 changed files with 25 additions and 5 deletions
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30
Userland/Libraries/LibWeb/Encoding/TextDecoder.cpp
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2022, Ali Mohammad Pur <mpfard@serenityos.org>
* Copyright (c) 2024, Simon Wanner <simon@skyrising.xyz>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -16,15 +17,34 @@ namespace Web::Encoding {
JS_DEFINE_ALLOCATOR(TextDecoder);
WebIDL::ExceptionOr<JS::NonnullGCPtr<TextDecoder>> TextDecoder::construct_impl(JS::Realm& realm, FlyString encoding, Optional<TextDecoderOptions> const& options)
// https://encoding.spec.whatwg.org/#dom-textdecoder
WebIDL::ExceptionOr<JS::NonnullGCPtr<TextDecoder>> TextDecoder::construct_impl(JS::Realm& realm, FlyString label, Optional<TextDecoderOptions> const& options)
{
auto& vm = realm.vm();
auto decoder = TextCodec::decoder_for(encoding);
if (!decoder.has_value())
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, TRY_OR_THROW_OOM(vm, String::formatted("Invalid encoding {}", encoding)) };
// 1. Let encoding be the result of getting an encoding from label.
auto encoding = TextCodec::get_standardized_encoding(label);
return realm.heap().allocate<TextDecoder>(realm, realm, *decoder, move(encoding), options.value_or({}).fatal, options.value_or({}).ignore_bom);
// 2. If encoding is failure or replacement, then throw a RangeError.
if (!encoding.has_value() || encoding->equals_ignoring_ascii_case("replacement"sv))
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::RangeError, TRY_OR_THROW_OOM(vm, String::formatted("Invalid encoding {}", label)) };
// 3. Set this’s encoding to encoding.
// https://encoding.spec.whatwg.org/#dom-textdecoder-encoding
// The encoding getter steps are to return this’s encoding’s name, ASCII lowercased.
auto lowercase_encoding_name = MUST(String::from_byte_string(encoding.value().to_lowercase_string()));
// 4. If options["fatal"] is true, then set this’s error mode to "fatal".
auto fatal = options.value_or({}).fatal;
// 5. Set this’s ignore BOM to options["ignoreBOM"].
auto ignore_bom = options.value_or({}).ignore_bom;
// NOTE: This should happen in decode(), but we don't support streaming yet and share decoders across calls.
auto decoder = TextCodec::decoder_for(encoding.value());
VERIFY(decoder.has_value());
return realm.heap().allocate<TextDecoder>(realm, realm, *decoder, lowercase_encoding_name, fatal, ignore_bom);
}
// https://encoding.spec.whatwg.org/#dom-textdecoder