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LibWeb: Parse <urange> as CSS::UnicodeRange

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Like, An+B, this is an old construct that does not fit well with modern
CSS syntax, so things get a bit hairy! We have to determine which
tokens match the grammar for `<urange>`, then turn those back into a
string, and then parse the string differently from normal. Thankfully
the spec describes in detail how to do that. :^)

This is not 100% correct, since we are not using the original source
text (referred to in the spec as the "representation") of the tokens,
but just converting them to strings in a manual, ad-hoc way.
Re-engineering the Tokenizer to keep that original text was too much of
a tangent for today. In any case, we do parse `U+4???`, `U+0-100`,
`U+1234`, and similar, so good enough for now!
This commit is contained in:
Sam Atkins 2022-04-07 17:41:54 +01:00 • committed by Andreas Kling
parent 1f7bf46061
commit ef7d80ced2
2 changed files with 265 additions and 1 deletions
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5
Userland/Libraries/LibWeb/CSS/Parser/Parser.h
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@ -1,6 +1,6 @@
/*
* Copyright (c) 2020-2021, the SerenityOS developers.
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2021-2022, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -26,6 +26,7 @@
#include <LibWeb/CSS/Selector.h>
#include <LibWeb/CSS/StyleValue.h>
#include <LibWeb/CSS/Supports.h>
#include <LibWeb/CSS/UnicodeRange.h>
namespace Web::CSS {
@ -276,6 +277,8 @@ private:
Optional<Color> parse_color(ComponentValue const&);
Optional<Length> parse_length(ComponentValue const&);
Optional<Ratio> parse_ratio(TokenStream<ComponentValue>&);
Optional<UnicodeRange> parse_unicode_range(TokenStream<ComponentValue>&);
Optional<UnicodeRange> create_unicode_range_from_tokens(TokenStream<ComponentValue>&, int start_position, int end_position);
enum class AllowedDataUrlType {
None,