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LibHTML: Add a way to get a Document's title

Browse source 
You can now query Document::title() to get a String containing whatever
is inside the document's <title> tag.

In support of this, this patch adds the <html>, <head> and <title>
elements.
This commit is contained in:
Andreas Kling 2019-09-29 16:24:57 +02:00
parent 0c6af2d5b4
commit b94c7665a9
12 changed files with 116 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

29
Libraries/LibHTML/DOM/Document.cpp
View file

@ -1,6 +1,9 @@
#include <LibHTML/CSS/StyleResolver.h> #include <LibHTML/CSS/StyleResolver.h>
#include <LibHTML/DOM/Document.h> #include <LibHTML/DOM/Document.h>
#include <LibHTML/DOM/Element.h> #include <LibHTML/DOM/Element.h>
#include <LibHTML/DOM/HTMLHeadElement.h>
#include <LibHTML/DOM/HTMLHtmlElement.h>
#include <LibHTML/DOM/HTMLTitleElement.h>
#include <LibHTML/Layout/LayoutDocument.h> #include <LibHTML/Layout/LayoutDocument.h>
#include <stdio.h> #include <stdio.h>
@ -34,3 +37,29 @@ void Document::normalize()
this->donate_all_children_to(body); this->donate_all_children_to(body);
this->append_child(html); this->append_child(html);
} }
const HTMLHtmlElement* Document::document_element() const
{
return static_cast<const HTMLHtmlElement*>(first_child_with_tag_name("html"));
}
const HTMLHeadElement* Document::head() const
{
auto* html = document_element();
if (!html)
return nullptr;
return static_cast<const HTMLHeadElement*>(html->first_child_with_tag_name("head"));
}
String Document::title() const
{
auto* head_element = head();
if (!head_element)
return {};
auto* title_element = static_cast<const HTMLTitleElement*>(head_element->first_child_with_tag_name("title"));
if (!title_element)
return {};
return title_element->text_content();
}

9
Libraries/LibHTML/DOM/Document.h
View file

@ -1,12 +1,14 @@
#pragma once #pragma once
#include <AK/String.h>
#include <AK/NonnullRefPtrVector.h> #include <AK/NonnullRefPtrVector.h>
#include <AK/OwnPtr.h> #include <AK/OwnPtr.h>
#include <AK/String.h>
#include <LibHTML/CSS/StyleResolver.h> #include <LibHTML/CSS/StyleResolver.h>
#include <LibHTML/CSS/StyleSheet.h> #include <LibHTML/CSS/StyleSheet.h>
#include <LibHTML/DOM/ParentNode.h> #include <LibHTML/DOM/ParentNode.h>
class HTMLHtmlElement;
class HTMLHeadElement;
class LayoutNode; class LayoutNode;
class StyleResolver; class StyleResolver;
class StyleSheet; class StyleSheet;
@ -29,6 +31,11 @@ public:
Node* hovered_node() { return m_hovered_node; } Node* hovered_node() { return m_hovered_node; }
const Node* hovered_node() const { return m_hovered_node; } const Node* hovered_node() const { return m_hovered_node; }
const HTMLHtmlElement* document_element() const;
const HTMLHeadElement* head() const;
String title() const;
private: private:
OwnPtr<StyleResolver> m_style_resolver; OwnPtr<StyleResolver> m_style_resolver;
NonnullRefPtrVector<StyleSheet> m_sheets; NonnullRefPtrVector<StyleSheet> m_sheets;

10
Libraries/LibHTML/DOM/HTMLHeadElement.cpp Normal file
View file

@ -0,0 +1,10 @@
#include <LibHTML/DOM/HTMLHeadElement.h>
HTMLHeadElement::HTMLHeadElement(Document& document, const String& tag_name)
: HTMLElement(document, tag_name)
{
}
HTMLHeadElement::~HTMLHeadElement()
{
}

9
Libraries/LibHTML/DOM/HTMLHeadElement.h Normal file
View file

@ -0,0 +1,9 @@
#pragma once
#include <LibHTML/DOM/HTMLElement.h>
class HTMLHeadElement : public HTMLElement {
public:
HTMLHeadElement(Document&, const String& tag_name);
virtual ~HTMLHeadElement() override;
};

10
Libraries/LibHTML/DOM/HTMLHtmlElement.cpp Normal file
View file

@ -0,0 +1,10 @@
#include <LibHTML/DOM/HTMLHtmlElement.h>
HTMLHtmlElement::HTMLHtmlElement(Document& document, const String& tag_name)
: HTMLElement(document, tag_name)
{
}
HTMLHtmlElement::~HTMLHtmlElement()
{
}

9
Libraries/LibHTML/DOM/HTMLHtmlElement.h Normal file
View file

@ -0,0 +1,9 @@
#pragma once
#include <LibHTML/DOM/HTMLElement.h>
class HTMLHtmlElement : public HTMLElement {
public:
HTMLHtmlElement(Document&, const String& tag_name);
virtual ~HTMLHtmlElement() override;
};

10
Libraries/LibHTML/DOM/HTMLTitleElement.cpp Normal file
View file

@ -0,0 +1,10 @@
#include <LibHTML/DOM/HTMLTitleElement.h>
HTMLTitleElement::HTMLTitleElement(Document& document, const String& tag_name)
: HTMLElement(document, tag_name)
{
}
HTMLTitleElement::~HTMLTitleElement()
{
}

9
Libraries/LibHTML/DOM/HTMLTitleElement.h Normal file
View file

@ -0,0 +1,9 @@
#pragma once
#include <LibHTML/DOM/HTMLElement.h>
class HTMLTitleElement : public HTMLElement {
public:
HTMLTitleElement(Document&, const String& tag_name);
virtual ~HTMLTitleElement() override;
};

9
Libraries/LibHTML/DOM/Node.h
View file

@ -46,6 +46,15 @@ public:
virtual bool is_html_element() const { return false; } virtual bool is_html_element() const { return false; }
const Node* first_child_with_tag_name(const StringView& tag_name) const
{
for (auto* child = first_child(); child; child = child->next_sibling()) {
if (child->tag_name() == tag_name)
return child;
}
return nullptr;
}
protected: protected:
Node(Document&, NodeType); Node(Document&, NodeType);

1
Libraries/LibHTML/HtmlView.h
View file

@ -13,6 +13,7 @@ public:
void set_document(Document*); void set_document(Document*);
Function<void(const String&)> on_link_click; Function<void(const String&)> on_link_click;
Function<void(const String&)> on_title_change;
protected: protected:
HtmlView(GWidget* parent = nullptr); HtmlView(GWidget* parent = nullptr);

3
Libraries/LibHTML/Makefile.shared
View file

@ -5,6 +5,9 @@ LIBHTML_OBJS = \
DOM/HTMLElement.o \ DOM/HTMLElement.o \
DOM/HTMLAnchorElement.o \ DOM/HTMLAnchorElement.o \
DOM/HTMLHeadingElement.o \ DOM/HTMLHeadingElement.o \
DOM/HTMLHeadElement.o \
DOM/HTMLHtmlElement.o \
DOM/HTMLTitleElement.o \
DOM/Document.o \ DOM/Document.o \
DOM/Text.o \ DOM/Text.o \
CSS/Selector.o \ CSS/Selector.o \

9
Libraries/LibHTML/Parser/HTMLParser.cpp
View file

@ -2,7 +2,10 @@
#include <AK/StringBuilder.h> #include <AK/StringBuilder.h>
#include <LibHTML/DOM/Element.h> #include <LibHTML/DOM/Element.h>
#include <LibHTML/DOM/HTMLAnchorElement.h> #include <LibHTML/DOM/HTMLAnchorElement.h>
#include <LibHTML/DOM/HTMLHeadElement.h>
#include <LibHTML/DOM/HTMLHeadingElement.h> #include <LibHTML/DOM/HTMLHeadingElement.h>
#include <LibHTML/DOM/HTMLHtmlElement.h>
#include <LibHTML/DOM/HTMLTitleElement.h>
#include <LibHTML/DOM/Text.h> #include <LibHTML/DOM/Text.h>
#include <LibHTML/Parser/HTMLParser.h> #include <LibHTML/Parser/HTMLParser.h>
#include <ctype.h> #include <ctype.h>
@ -13,6 +16,12 @@ static NonnullRefPtr<Element> create_element(Document& document, const String& t
auto lowercase_tag_name = tag_name.to_lowercase(); auto lowercase_tag_name = tag_name.to_lowercase();
if (lowercase_tag_name == "a") if (lowercase_tag_name == "a")
return adopt(*new HTMLAnchorElement(document, tag_name)); return adopt(*new HTMLAnchorElement(document, tag_name));
if (lowercase_tag_name == "html")
return adopt(*new HTMLHtmlElement(document, tag_name));
if (lowercase_tag_name == "head")
return adopt(*new HTMLHeadElement(document, tag_name));
if (lowercase_tag_name == "title")
return adopt(*new HTMLTitleElement(document, tag_name));
if (lowercase_tag_name == "h1" if (lowercase_tag_name == "h1"
|| lowercase_tag_name == "h2" || lowercase_tag_name == "h2"
|| lowercase_tag_name == "h3" || lowercase_tag_name == "h3"