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LibWeb: Allow passing StringView to CSSRuleList::insert_a_css_rule()

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The spec is a little bizarre here. One caller of this
(`CSSStyleSheet::insert_rule()`) wants to give it a parsed CSSRule, but
the spec itself wants it to take a string. (As will be used by
`CSSGroupingRule::insert_rule()`) Using a Variant isn't pretty but it's
the best solution I've come to - having two overloads was worse, whether
one called the other or they just duplicated the logic. This seems the
least bad.
This commit is contained in:
Sam Atkins 2022-04-23 11:29:31 +01:00 • committed by Andreas Kling
parent dfba0cb2d9
commit 6e6607a92f
Notes: sideshowbarker 2024-07-18 04:38:32 +09:00
2 changed files with 19 additions and 7 deletions
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21
Userland/Libraries/LibWeb/CSS/CSSRuleList.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2021-2022, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -9,7 +9,7 @@
#include <LibWeb/CSS/CSSMediaRule.h>
#include <LibWeb/CSS/CSSRuleList.h>
#include <LibWeb/CSS/CSSSupportsRule.h>
#include <LibWeb/DOM/ExceptionOr.h>
#include <LibWeb/CSS/Parser/Parser.h>
namespace Web::CSS {
@ -26,7 +26,7 @@ bool CSSRuleList::is_supported_property_index(u32 index) const
}
// https://www.w3.org/TR/cssom/#insert-a-css-rule
DOM::ExceptionOr<unsigned> CSSRuleList::insert_a_css_rule(NonnullRefPtr<CSSRule> rule, u32 index)
DOM::ExceptionOr<unsigned> CSSRuleList::insert_a_css_rule(Variant<StringView, NonnullRefPtr<CSSRule>> rule, u32 index)
{
// 1. Set length to the number of items in list.
auto length = m_rules.size();
@ -35,16 +35,27 @@ DOM::ExceptionOr<unsigned> CSSRuleList::insert_a_css_rule(NonnullRefPtr<CSSRule>
if (index > length)
return DOM::IndexSizeError::create("CSS rule index out of bounds.");
// NOTE: These steps don't apply since we're receiving a parsed rule.
// 3. Set new rule to the results of performing parse a CSS rule on argument rule.
// NOTE: The insert-a-css-rule spec expects `rule` to be a string, but the CSSStyleSheet.insertRule()
// spec calls this algorithm with an already-parsed CSSRule. So, we use a Variant and skip step 3
// if that variant holds a CSSRule already.
RefPtr<CSSRule> new_rule;
if (rule.has<StringView>()) {
new_rule = parse_css_rule(CSS::Parser::ParsingContext {}, rule.get<StringView>());
} else {
new_rule = rule.get<NonnullRefPtr<CSSRule>>();
}
// 4. If new rule is a syntax error, throw a SyntaxError exception.
if (!new_rule)
return DOM::SyntaxError::create("Unable to parse CSS rule.");
// FIXME: 5. If new rule cannot be inserted into list at the zero-index position index due to constraints specified by CSS, then throw a HierarchyRequestError exception. [CSS21]
// FIXME: 6. If new rule is an @namespace at-rule, and list contains anything other than @import at-rules, and @namespace at-rules, throw an InvalidStateError exception.
// 7. Insert new rule into list at the zero-indexed position index.
m_rules.insert(index, move(rule));
m_rules.insert(index, new_rule.release_nonnull());
// 8. Return index.
return index;

5
Userland/Libraries/LibWeb/CSS/CSSRuleList.h
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2021-2022, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -12,6 +12,7 @@
#include <AK/RefCounted.h>
#include <AK/RefPtr.h>
#include <LibWeb/CSS/CSSRule.h>
#include <LibWeb/DOM/ExceptionOr.h>
#include <LibWeb/Forward.h>
namespace Web::CSS {
@ -49,7 +50,7 @@ public:
bool is_supported_property_index(u32 index) const;
DOM::ExceptionOr<void> remove_a_css_rule(u32 index);
DOM::ExceptionOr<unsigned> insert_a_css_rule(NonnullRefPtr<CSSRule>, u32 index);
DOM::ExceptionOr<unsigned> insert_a_css_rule(Variant<StringView, NonnullRefPtr<CSSRule>>, u32 index);
void for_each_effective_style_rule(Function<void(CSSStyleRule const&)> const& callback) const;
// Returns whether the match state of any media queries changed after evaluation.