d641bfd7e2
Move PropertyNameAndID, custom property data, registered custom properties, and Typed OM associated property names to Utf16FlyString. This removes the FlyString storage boundary from CSS property-name handling and lets CSSStyleProperties keep the name it receives from CSSOM instead of converting it back to UTF-8.
55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
/*
|
||
* Copyright (c) 2024-2025, Sam Atkins <sam@ladybird.org>
|
||
*
|
||
* SPDX-License-Identifier: BSD-2-Clause
|
||
*/
|
||
|
||
#pragma once
|
||
|
||
#include <AK/StringView.h>
|
||
#include <AK/Utf16FlyString.h>
|
||
#include <LibWeb/CSS/PropertyID.h>
|
||
|
||
namespace Web::CSS {
|
||
|
||
inline bool is_invalid_custom_property_name_string(StringView string)
|
||
{
|
||
// https://drafts.csswg.org/css-variables-2/#typedef-custom-property-name
|
||
// The <custom-property-name> production corresponds to this: it’s defined as any <dashed-ident>
|
||
// (a valid identifier that starts with two dashes), except -- itself, which is reserved for future use by CSS.
|
||
return string == "--"sv;
|
||
}
|
||
|
||
// https://drafts.css-houdini.org/css-typed-om-1/#custom-property-name-string
|
||
inline bool is_a_custom_property_name_string(StringView string)
|
||
{
|
||
// A string is a custom property name string if it starts with two dashes (U+002D HYPHEN-MINUS), like --foo.
|
||
return string.starts_with("--"sv) && !is_invalid_custom_property_name_string(string);
|
||
}
|
||
|
||
inline bool is_a_custom_property_name_string(Utf16FlyString const& string)
|
||
{
|
||
return string.length_in_code_units() > 2
|
||
&& string.code_unit_at(0) == '-'
|
||
&& string.code_unit_at(1) == '-';
|
||
}
|
||
|
||
// https://drafts.css-houdini.org/css-typed-om-1/#valid-css-property
|
||
inline bool is_a_valid_css_property(StringView string)
|
||
{
|
||
// A string is a valid CSS property if it is a custom property name string, or is a CSS property name recognized by
|
||
// the user agent.
|
||
return is_a_custom_property_name_string(string) || property_id_from_string(string).has_value();
|
||
}
|
||
|
||
inline bool is_a_valid_css_property(Utf16FlyString const& string)
|
||
{
|
||
if (is_a_custom_property_name_string(string))
|
||
return true;
|
||
if (!string.is_ascii())
|
||
return false;
|
||
auto string_data = string.to_utf16_string();
|
||
return property_id_from_string(string_data.ascii_view()).has_value();
|
||
}
|
||
|
||
}
|