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LibWeb: Add Document::get_style_sheet_source()

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This returns the source text of the specified style sheet. StyleComputer
now exposes user agent style sheets so that these can also be requested.
This commit is contained in:
Sam Atkins 2024-08-23 11:03:05 +01:00 • committed by Sam Atkins
commit 49b2eb5f51
Notes: github-actions[bot] 2024-09-03 09:13:03 +00:00
4 changed files with 98 additions and 4 deletions
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76
Userland/Libraries/LibWeb/DOM/Document.cpp
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@ -2,7 +2,7 @@
* Copyright (c) 2018-2024, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021-2023, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2021-2023, Luke Wilde <lukew@serenityos.org>
* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2021-2024, Sam Atkins <sam@ladybird.org>
* Copyright (c) 2024, Matthew Olsson <mattco@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
@ -26,10 +26,12 @@
#include <LibWeb/Bindings/MainThreadVM.h>
#include <LibWeb/CSS/AnimationEvent.h>
#include <LibWeb/CSS/CSSAnimation.h>
#include <LibWeb/CSS/CSSImportRule.h>
#include <LibWeb/CSS/FontFaceSet.h>
#include <LibWeb/CSS/MediaQueryList.h>
#include <LibWeb/CSS/MediaQueryListEvent.h>
#include <LibWeb/CSS/StyleComputer.h>
#include <LibWeb/CSS/StyleSheetIdentifier.h>
#include <LibWeb/CSS/SystemColor.h>
#include <LibWeb/CSS/VisualViewport.h>
#include <LibWeb/Cookie/ParsedCookie.h>
@ -84,6 +86,7 @@
#include <LibWeb/HTML/HTMLLinkElement.h>
#include <LibWeb/HTML/HTMLObjectElement.h>
#include <LibWeb/HTML/HTMLScriptElement.h>
#include <LibWeb/HTML/HTMLStyleElement.h>
#include <LibWeb/HTML/HTMLTitleElement.h>
#include <LibWeb/HTML/HashChangeEvent.h>
#include <LibWeb/HTML/ListOfAvailableImages.h>
@ -119,8 +122,8 @@
#include <LibWeb/ResizeObserver/ResizeObserverEntry.h>
#include <LibWeb/SVG/SVGDecodedImageData.h>
#include <LibWeb/SVG/SVGElement.h>
#include <LibWeb/SVG/SVGStyleElement.h>
#include <LibWeb/SVG/SVGTitleElement.h>
#include <LibWeb/SVG/TagNames.h>
#include <LibWeb/Selection/Selection.h>
#include <LibWeb/UIEvents/EventNames.h>
#include <LibWeb/UIEvents/FocusEvent.h>
@ -5125,6 +5128,75 @@ void Document::for_each_active_css_style_sheet(Function<void(CSS::CSSStyleSheet&
}
}
static Optional<CSS::CSSStyleSheet&> find_style_sheet_with_url(String const& url, CSS::CSSStyleSheet& style_sheet)
{
if (style_sheet.location() == url)
return style_sheet;
for (auto& import_rule : style_sheet.import_rules()) {
if (import_rule->loaded_style_sheet()) {
if (auto match = find_style_sheet_with_url(url, *import_rule->loaded_style_sheet()); match.has_value())
return match;
}
}
return {};
}
Optional<String> Document::get_style_sheet_source(CSS::StyleSheetIdentifier const& identifier) const
{
switch (identifier.type) {
case CSS::StyleSheetIdentifier::Type::StyleElement:
if (identifier.dom_element_unique_id.has_value()) {
if (auto* node = Node::from_unique_id(*identifier.dom_element_unique_id)) {
if (node->is_html_style_element()) {
if (auto* sheet = verify_cast<HTML::HTMLStyleElement>(*node).sheet())
return sheet->source_text({});
}
if (node->is_svg_style_element()) {
if (auto* sheet = verify_cast<SVG::SVGStyleElement>(*node).sheet())
return sheet->source_text({});
}
}
}
return {};
case CSS::StyleSheetIdentifier::Type::LinkElement:
case CSS::StyleSheetIdentifier::Type::ImportRule: {
if (!identifier.url.has_value()) {
dbgln("Attempting to get link or imported style-sheet with no url; giving up");
return {};
}
if (m_style_sheets) {
for (auto& style_sheet : m_style_sheets->sheets()) {
if (auto match = find_style_sheet_with_url(identifier.url.value(), style_sheet); match.has_value())
return match->source_text({});
}
}
if (m_adopted_style_sheets) {
Optional<String> result;
m_adopted_style_sheets->for_each<CSS::CSSStyleSheet>([&](auto& style_sheet) {
if (result.has_value())
return;
if (auto match = find_style_sheet_with_url(identifier.url.value(), style_sheet); match.has_value())
result = match->source_text({});
});
return result;
}
return {};
}
case CSS::StyleSheetIdentifier::Type::UserAgent:
return CSS::StyleComputer::user_agent_style_sheet_source(identifier.url.value());
case CSS::StyleSheetIdentifier::Type::UserStyle:
return page().user_style();
}
return {};
}
void Document::register_shadow_root(Badge<DOM::ShadowRoot>, DOM::ShadowRoot& shadow_root)
{
m_shadow_roots.append(shadow_root);