From a4fccc02ecb1a956edd98fc25e335bb7e4905bb1 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Sun, 29 Sep 2019 17:43:30 +0200
Subject: [PATCH] LibHTML: Add a simple <style> element for inline CSS

---
 Libraries/LibHTML/DOM/HTMLStyleElement.cpp | 28 ++++++++++++++++++++++
 Libraries/LibHTML/DOM/HTMLStyleElement.h   | 17 +++++++++++++
 Libraries/LibHTML/Makefile.shared          |  1 +
 Libraries/LibHTML/Parser/HTMLParser.cpp    |  3 +++
 4 files changed, 49 insertions(+)
 create mode 100644 Libraries/LibHTML/DOM/HTMLStyleElement.cpp
 create mode 100644 Libraries/LibHTML/DOM/HTMLStyleElement.h

diff --git a/Libraries/LibHTML/DOM/HTMLStyleElement.cpp b/Libraries/LibHTML/DOM/HTMLStyleElement.cpp
new file mode 100644
index 0000000000..d527b58dcf
--- /dev/null
+++ b/Libraries/LibHTML/DOM/HTMLStyleElement.cpp
@@ -0,0 +1,28 @@
+#include <LibHTML/DOM/Document.h>
+#include <LibHTML/DOM/HTMLStyleElement.h>
+#include <LibHTML/Parser/CSSParser.h>
+
+HTMLStyleElement::HTMLStyleElement(Document& document, const String& tag_name)
+    : HTMLElement(document, tag_name)
+{
+}
+
+HTMLStyleElement::~HTMLStyleElement()
+{
+}
+
+void HTMLStyleElement::inserted_into(Node& new_parent)
+{
+    m_stylesheet = parse_css(text_content());
+    if (m_stylesheet)
+        document().add_sheet(*m_stylesheet);
+    HTMLElement::inserted_into(new_parent);
+}
+
+void HTMLStyleElement::removed_from(Node& old_parent)
+{
+    if (m_stylesheet) {
+        // FIXME: Remove the sheet from the document
+    }
+    return HTMLElement::removed_from(old_parent);
+}
diff --git a/Libraries/LibHTML/DOM/HTMLStyleElement.h b/Libraries/LibHTML/DOM/HTMLStyleElement.h
new file mode 100644
index 0000000000..4f46cf50fc
--- /dev/null
+++ b/Libraries/LibHTML/DOM/HTMLStyleElement.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <LibHTML/DOM/HTMLElement.h>
+
+class StyleSheet;
+
+class HTMLStyleElement : public HTMLElement {
+public:
+    HTMLStyleElement(Document&, const String& tag_name);
+    virtual ~HTMLStyleElement() override;
+
+    virtual void inserted_into(Node&) override;
+    virtual void removed_from(Node&) override;
+
+private:
+    RefPtr<StyleSheet> m_stylesheet;
+};
diff --git a/Libraries/LibHTML/Makefile.shared b/Libraries/LibHTML/Makefile.shared
index 76329a0299..43a6f33500 100644
--- a/Libraries/LibHTML/Makefile.shared
+++ b/Libraries/LibHTML/Makefile.shared
@@ -7,6 +7,7 @@ LIBHTML_OBJS = \
     DOM/HTMLHeadingElement.o \
     DOM/HTMLHeadElement.o \
     DOM/HTMLHtmlElement.o \
+    DOM/HTMLStyleElement.o \
     DOM/HTMLTitleElement.o \
     DOM/Document.o \
     DOM/Text.o \
diff --git a/Libraries/LibHTML/Parser/HTMLParser.cpp b/Libraries/LibHTML/Parser/HTMLParser.cpp
index b8d5d2ed6f..079d45173b 100644
--- a/Libraries/LibHTML/Parser/HTMLParser.cpp
+++ b/Libraries/LibHTML/Parser/HTMLParser.cpp
@@ -6,6 +6,7 @@
 #include <LibHTML/DOM/HTMLHeadElement.h>
 #include <LibHTML/DOM/HTMLHeadingElement.h>
 #include <LibHTML/DOM/HTMLHtmlElement.h>
+#include <LibHTML/DOM/HTMLStyleElement.h>
 #include <LibHTML/DOM/HTMLTitleElement.h>
 #include <LibHTML/DOM/Text.h>
 #include <LibHTML/Parser/HTMLParser.h>
@@ -21,6 +22,8 @@ static NonnullRefPtr<Element> create_element(Document& document, const String& t
         return adopt(*new HTMLHtmlElement(document, tag_name));
     if (lowercase_tag_name == "head")
         return adopt(*new HTMLHeadElement(document, tag_name));
+    if (lowercase_tag_name == "style")
+        return adopt(*new HTMLStyleElement(document, tag_name));
     if (lowercase_tag_name == "title")
         return adopt(*new HTMLTitleElement(document, tag_name));
     if (lowercase_tag_name == "h1"