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LibWeb: Parse <script> elements and run any JavaScript found inside

Browse source 
This patch begins integrating LibJS into LibWeb. Document holds the
JS::Interpreter for now, and it is created on demand when you first
call Document::interpreter().

We also add a simple "alert()" function to the global object.
This commit is contained in:
Andreas Kling 2020-03-14 12:41:51 +01:00
parent f94099f796
commit 9c9d3f0904
11 changed files with 142 additions and 3 deletions
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2
Applications/Browser/Makefile
View file

@ -4,7 +4,7 @@ OBJS = \
PROGRAM = Browser
LIB_DEPS = GUI Web Gfx IPC Protocol Core
LIB_DEPS = Web JS GUI Gfx IPC Protocol Core
main.cpp: ../../Libraries/LibWeb/CSS/PropertyID.h
../../Libraries/LibWeb/CSS/PropertyID.h:

2
Applications/Help/Makefile
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@ -7,6 +7,6 @@ OBJS = \
PROGRAM = Help
LIB_DEPS = GUI Web Gfx Markdown IPC Protocol Thread Pthread Core
LIB_DEPS = GUI Web JS Gfx Markdown IPC Protocol Thread Pthread Core
include ../../Makefile.common

2
Applications/IRCClient/Makefile
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@ -11,6 +11,6 @@ OBJS = \
PROGRAM = IRCClient
LIB_DEPS = GUI Web Gfx Protocol IPC Thread Pthread Core
LIB_DEPS = Web JS GUI Gfx Protocol IPC Thread Pthread Core
include ../../Makefile.common

10
Base/home/anon/www/alert.html Normal file
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@ -0,0 +1,10 @@
<!DOCTYPE html>
<html>
<head>
<script>
alert("Hello friends!");
</script>
</head>
<body>
</body>
</html>

1
Base/home/anon/www/welcome.html
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@ -23,6 +23,7 @@ h1 {
<p>This is a very simple browser built on the LibWeb engine.</p>
<p>Some small test pages:</p>
<ul>
<li><a href="alert.html">alert() test</a></li>
<li><a href="small.html">small</a></li>
<li><a href="first-child.html">:first-child</a></li>
<li><a href="last-child.html">:last-child</a></li>

18
Libraries/LibWeb/DOM/Document.cpp
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@ -28,6 +28,9 @@
#include <AK/StringBuilder.h>
#include <LibCore/Timer.h>
#include <LibGUI/Application.h>
#include <LibGUI/MessageBox.h>
#include <LibJS/GlobalObject.h>
#include <LibJS/Interpreter.h>
#include <LibWeb/CSS/StyleResolver.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/DocumentType.h>
@ -332,4 +335,19 @@ Color Document::visited_link_color() const
return frame()->html_view()->palette().visited_link();
}
JS::Interpreter& Document::interpreter()
{
if (!m_interpreter) {
m_interpreter = make<JS::Interpreter>();
m_interpreter->global_object().put_native_function("alert", [](JS::Interpreter&, Vector<JS::Value> arguments) -> JS::Value {
if (arguments.size() < 1)
return JS::js_undefined();
GUI::MessageBox::show(arguments[0].to_string(), "Alert", GUI::MessageBox::Type::Information);
return JS::js_undefined();
});
}
return *m_interpreter;
}
}

5
Libraries/LibWeb/DOM/Document.h
View file

@ -33,6 +33,7 @@
#include <AK/URL.h>
#include <AK/WeakPtr.h>
#include <LibCore/Forward.h>
#include <LibJS/Forward.h>
#include <LibWeb/CSS/StyleResolver.h>
#include <LibWeb/CSS/StyleSheet.h>
#include <LibWeb/DOM/ParentNode.h>
@ -120,6 +121,8 @@ public:
const String& source() const { return m_source; }
void set_source(const String& source) { m_source = source; }
JS::Interpreter& interpreter();
private:
virtual RefPtr<LayoutNode> create_layout_node(const StyleProperties* parent_style) const override;
@ -139,6 +142,8 @@ private:
RefPtr<Core::Timer> m_style_update_timer;
String m_source;
OwnPtr<JS::Interpreter> m_interpreter;
};
template<>

3
Libraries/LibWeb/DOM/ElementFactory.cpp
View file

@ -38,6 +38,7 @@
#include <LibWeb/DOM/HTMLImageElement.h>
#include <LibWeb/DOM/HTMLInputElement.h>
#include <LibWeb/DOM/HTMLLinkElement.h>
#include <LibWeb/DOM/HTMLScriptElement.h>
#include <LibWeb/DOM/HTMLStyleElement.h>
#include <LibWeb/DOM/HTMLTitleElement.h>
@ -82,6 +83,8 @@ NonnullRefPtr<Element> create_element(Document& document, const String& tag_name
|| lowercase_tag_name == "h6") {
return adopt(*new HTMLHeadingElement(document, lowercase_tag_name));
}
if (lowercase_tag_name == "script")
return adopt(*new HTMLScriptElement(document, lowercase_tag_name));
return adopt(*new Element(document, lowercase_tag_name));
}

60
Libraries/LibWeb/DOM/HTMLScriptElement.cpp Normal file
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@ -0,0 +1,60 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/StringBuilder.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Parser.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/HTMLScriptElement.h>
#include <LibWeb/DOM/Text.h>
namespace Web {
HTMLScriptElement::HTMLScriptElement(Document& document, const String& tag_name)
: HTMLElement(document, tag_name)
{
}
HTMLScriptElement::~HTMLScriptElement()
{
}
void HTMLScriptElement::inserted_into(Node& new_parent)
{
HTMLElement::inserted_into(new_parent);
StringBuilder builder;
for_each_child([&](auto& child) {
if (is<Text>(child))
builder.append(to<Text>(child).text_content());
});
auto source = builder.to_string();
auto program = JS::Parser(JS::Lexer(source)).parse_program();
document().interpreter().run(*program);
}
}

41
Libraries/LibWeb/DOM/HTMLScriptElement.h Normal file
View file

@ -0,0 +1,41 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <LibWeb/DOM/HTMLElement.h>
namespace Web {
class HTMLScriptElement : public HTMLElement {
public:
HTMLScriptElement(Document&, const String& tag_name);
virtual ~HTMLScriptElement() override;
virtual void inserted_into(Node&) override;
};
}

1
Libraries/LibWeb/Makefile
View file

@ -29,6 +29,7 @@ LIBWEB_OBJS = \
DOM/HTMLImageElement.o \
DOM/HTMLInputElement.o \
DOM/HTMLLinkElement.o \
DOM/HTMLScriptElement.o \
DOM/HTMLStyleElement.o \
DOM/HTMLTitleElement.o \
DOM/Node.o \