From e2a935b1dc8a825566da2be91710e6cd648c2c7d Mon Sep 17 00:00:00 2001
From: PrestonLTaylor <95388976+PrestonLTaylor@users.noreply.github.com>
Date: Thu, 8 Jun 2023 17:48:33 +0100
Subject: [PATCH] LibWeb: Implement the `<style>` SVG element
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The `<style>` element is allowed to be in the SVG namespace, so we now
support this element.

It has the same behaviour as the HTML namespace `<style>` element as
described in the spec.

"The semantics and processing of a ‘style’ and its attributes must be
the same as is defined for the HTML ‘style’ element."
---
 Userland/Libraries/LibWeb/CMakeLists.txt      |  1 +
 .../Libraries/LibWeb/DOM/ElementFactory.cpp   |  3 +
 .../Libraries/LibWeb/SVG/SVGStyleElement.cpp  | 64 +++++++++++++++++++
 .../Libraries/LibWeb/SVG/SVGStyleElement.h    | 37 +++++++++++
 .../Libraries/LibWeb/SVG/SVGStyleElement.idl  | 11 ++++
 Userland/Libraries/LibWeb/SVG/TagNames.h      |  1 +
 Userland/Libraries/LibWeb/idl_files.cmake     |  1 +
 7 files changed, 118 insertions(+)
 create mode 100644 Userland/Libraries/LibWeb/SVG/SVGStyleElement.cpp
 create mode 100644 Userland/Libraries/LibWeb/SVG/SVGStyleElement.h
 create mode 100644 Userland/Libraries/LibWeb/SVG/SVGStyleElement.idl

diff --git a/Userland/Libraries/LibWeb/CMakeLists.txt b/Userland/Libraries/LibWeb/CMakeLists.txt
index 354035f149..0e2e201042 100644
--- a/Userland/Libraries/LibWeb/CMakeLists.txt
+++ b/Userland/Libraries/LibWeb/CMakeLists.txt
@@ -523,6 +523,7 @@ set(SOURCES
     SVG/SVGRadialGradientElement.cpp
     SVG/SVGSVGElement.cpp
     SVG/SVGStopElement.cpp
+    SVG/SVGStyleElement.cpp
     SVG/SVGSymbolElement.cpp
     SVG/SVGTextContentElement.cpp
     SVG/SVGTitleElement.cpp
diff --git a/Userland/Libraries/LibWeb/DOM/ElementFactory.cpp b/Userland/Libraries/LibWeb/DOM/ElementFactory.cpp
index d63b9aeb9b..5c11be7abc 100644
--- a/Userland/Libraries/LibWeb/DOM/ElementFactory.cpp
+++ b/Userland/Libraries/LibWeb/DOM/ElementFactory.cpp
@@ -97,6 +97,7 @@
 #include <LibWeb/SVG/SVGRectElement.h>
 #include <LibWeb/SVG/SVGSVGElement.h>
 #include <LibWeb/SVG/SVGStopElement.h>
+#include <LibWeb/SVG/SVGStyleElement.h>
 #include <LibWeb/SVG/SVGSymbolElement.h>
 #include <LibWeb/SVG/SVGTextContentElement.h>
 #include <LibWeb/SVG/SVGTitleElement.h>
@@ -456,6 +457,8 @@ static WebIDL::ExceptionOr<JS::GCPtr<SVG::SVGElement>> create_svg_element(JS::Re
         return MUST_OR_THROW_OOM(realm.heap().allocate<SVG::SVGGElement>(realm, document, move(qualified_name)));
     if (local_name == SVG::TagNames::stop)
         return MUST_OR_THROW_OOM(realm.heap().allocate<SVG::SVGStopElement>(realm, document, move(qualified_name)));
+    if (local_name == SVG::TagNames::style)
+        return MUST_OR_THROW_OOM(realm.heap().allocate<SVG::SVGStyleElement>(realm, document, move(qualified_name)));
     if (local_name == SVG::TagNames::symbol)
         return MUST_OR_THROW_OOM(realm.heap().allocate<SVG::SVGSymbolElement>(realm, document, move(qualified_name)));
     if (local_name == SVG::TagNames::text)
diff --git a/Userland/Libraries/LibWeb/SVG/SVGStyleElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGStyleElement.cpp
new file mode 100644
index 0000000000..6f12a81647
--- /dev/null
+++ b/Userland/Libraries/LibWeb/SVG/SVGStyleElement.cpp
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2023, Preston Taylor <PrestonLeeTaylor@proton.me>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/SVG/SVGStyleElement.h>
+
+namespace Web::SVG {
+
+SVGStyleElement::SVGStyleElement(DOM::Document& document, DOM::QualifiedName qualified_name)
+    : SVGElement(document, move(qualified_name))
+{
+}
+
+SVGStyleElement::~SVGStyleElement() = default;
+
+JS::ThrowCompletionOr<void> SVGStyleElement::initialize(JS::Realm& realm)
+{
+    MUST_OR_THROW_OOM(Base::initialize(realm));
+    set_prototype(&Bindings::ensure_web_prototype<Bindings::SVGStyleElementPrototype>(realm, "SVGStyleElement"));
+
+    return {};
+}
+
+void SVGStyleElement::visit_edges(Cell::Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_style_element_utils.sheet());
+}
+
+void SVGStyleElement::children_changed()
+{
+    m_style_element_utils.update_a_style_block(*this);
+    Base::children_changed();
+}
+
+void SVGStyleElement::inserted()
+{
+    m_style_element_utils.update_a_style_block(*this);
+    Base::inserted();
+}
+
+void SVGStyleElement::removed_from(Node* old_parent)
+{
+    m_style_element_utils.update_a_style_block(*this);
+    Base::removed_from(old_parent);
+}
+
+// https://www.w3.org/TR/cssom/#dom-linkstyle-sheet
+CSS::CSSStyleSheet* SVGStyleElement::sheet()
+{
+    // The sheet attribute must return the associated CSS style sheet for the node or null if there is no associated CSS style sheet.
+    return m_style_element_utils.sheet();
+}
+
+// https://www.w3.org/TR/cssom/#dom-linkstyle-sheet
+CSS::CSSStyleSheet const* SVGStyleElement::sheet() const
+{
+    // The sheet attribute must return the associated CSS style sheet for the node or null if there is no associated CSS style sheet.
+    return m_style_element_utils.sheet();
+}
+
+}
diff --git a/Userland/Libraries/LibWeb/SVG/SVGStyleElement.h b/Userland/Libraries/LibWeb/SVG/SVGStyleElement.h
new file mode 100644
index 0000000000..1d4a53d1cc
--- /dev/null
+++ b/Userland/Libraries/LibWeb/SVG/SVGStyleElement.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2023, Preston Taylor <PrestonLeeTaylor@proton.me>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/DOM/StyleElementUtils.h>
+#include <LibWeb/SVG/SVGElement.h>
+
+namespace Web::SVG {
+
+class SVGStyleElement final : public SVGElement {
+    WEB_PLATFORM_OBJECT(HTMLStyleElement, SVGElement);
+
+public:
+    virtual ~SVGStyleElement() override;
+
+    virtual void children_changed() override;
+    virtual void inserted() override;
+    virtual void removed_from(Node*) override;
+
+    CSS::CSSStyleSheet* sheet();
+    CSS::CSSStyleSheet const* sheet() const;
+
+private:
+    SVGStyleElement(DOM::Document&, DOM::QualifiedName);
+
+    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void visit_edges(Cell::Visitor&) override;
+
+    // The semantics and processing of a ‘style’ and its attributes must be the same as is defined for the HTML ‘style’ element.
+    DOM::StyleElementUtils m_style_element_utils;
+};
+
+}
diff --git a/Userland/Libraries/LibWeb/SVG/SVGStyleElement.idl b/Userland/Libraries/LibWeb/SVG/SVGStyleElement.idl
new file mode 100644
index 0000000000..b1fcd5f7ba
--- /dev/null
+++ b/Userland/Libraries/LibWeb/SVG/SVGStyleElement.idl
@@ -0,0 +1,11 @@
+#import <CSS/LinkStyle.idl>
+#import <SVG/SVGElement.idl>
+
+[Exposed=Window]
+interface SVGStyleElement : SVGElement {
+  [Reflect] attribute DOMString type;
+  [Reflect] attribute DOMString media;
+  [Reflect] attribute DOMString title;
+};
+
+SVGStyleElement includes LinkStyle;
diff --git a/Userland/Libraries/LibWeb/SVG/TagNames.h b/Userland/Libraries/LibWeb/SVG/TagNames.h
index 36887a0d4b..963a00db9e 100644
--- a/Userland/Libraries/LibWeb/SVG/TagNames.h
+++ b/Userland/Libraries/LibWeb/SVG/TagNames.h
@@ -33,6 +33,7 @@ namespace Web::SVG::TagNames {
     __ENUMERATE_SVG_TAG(radialGradient) \
     __ENUMERATE_SVG_TAG(script)         \
     __ENUMERATE_SVG_TAG(stop)           \
+    __ENUMERATE_SVG_TAG(style)          \
     __ENUMERATE_SVG_TAG(symbol)         \
     __ENUMERATE_SVG_TAG(title)          \
     __ENUMERATE_SVG_TAG(use)
diff --git a/Userland/Libraries/LibWeb/idl_files.cmake b/Userland/Libraries/LibWeb/idl_files.cmake
index 4396976183..01e56a75be 100644
--- a/Userland/Libraries/LibWeb/idl_files.cmake
+++ b/Userland/Libraries/LibWeb/idl_files.cmake
@@ -211,6 +211,7 @@ libweb_js_bindings(SVG/SVGRadialGradientElement)
 libweb_js_bindings(SVG/SVGRectElement)
 libweb_js_bindings(SVG/SVGSVGElement)
 libweb_js_bindings(SVG/SVGStopElement)
+libweb_js_bindings(SVG/SVGStyleElement)
 libweb_js_bindings(SVG/SVGSymbolElement)
 libweb_js_bindings(SVG/SVGTextContentElement)
 libweb_js_bindings(SVG/SVGTitleElement)