LibWebView+WebContent: Add APIs to manipulate DOM nodes

This adds APIs to allow Ispector clients to:
* Change a DOM text or comment node's text data.
* Add, replace, or remove a DOM element's attribute.
* Change a DOM element's tag.

Userland/Libraries/LibWebView/Attribute.cpp

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibIPC/Decoder.h>
+#include <LibIPC/Encoder.h>
+#include <LibWebView/Attribute.h>
+
+template<>
+ErrorOr<void> IPC::encode(Encoder& encoder, WebView::Attribute const& attribute)
+{
+    TRY(encoder.encode(attribute.name));
+    TRY(encoder.encode(attribute.value));
+    return {};
+}
+
+template<>
+ErrorOr<WebView::Attribute> IPC::decode(Decoder& decoder)
+{
+    auto name = TRY(decoder.decode<String>());
+    auto value = TRY(decoder.decode<String>());
+
+    return WebView::Attribute { move(name), move(value) };
+}

Userland/Libraries/LibWebView/Attribute.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/String.h>
+#include <LibIPC/Forward.h>
+
+namespace WebView {
+
+struct Attribute {
+    String name;
+    String value;
+};
+
+}
+
+namespace IPC {
+
+template<>
+ErrorOr<void> encode(Encoder&, WebView::Attribute const&);
+
+template<>
+ErrorOr<WebView::Attribute> decode(Decoder&);
+
+}

Userland/Libraries/LibWebView/CMakeLists.txt

@@ -1,6 +1,7 @@
 include(${SerenityOS_SOURCE_DIR}/Meta/CMake/public_suffix.cmake)
 
 set(SOURCES
+    Attribute.cpp
     CookieJar.cpp
     Database.cpp
     History.cpp

Userland/Libraries/LibWebView/Forward.h

@@ -18,6 +18,7 @@ class OutOfProcessWebView;
 class ViewImplementation;
 class WebContentClient;
 
+struct Attribute;
 struct CookieStorageKey;
 struct SearchEngine;
 

Userland/Libraries/LibWebView/ViewImplementation.cpp

@@ -181,6 +181,21 @@ i32 ViewImplementation::get_hovered_node_id()
     return client().get_hovered_node_id();
 }
 
+void ViewImplementation::set_dom_node_text(i32 node_id, String text)
+{
+    client().async_set_dom_node_text(node_id, move(text));
+}
+
+Optional<i32> ViewImplementation::set_dom_node_tag(i32 node_id, String name)
+{
+    return client().set_dom_node_tag(node_id, move(name));
+}
+
+void ViewImplementation::replace_dom_node_attribute(i32 node_id, String name, Vector<Attribute> replacement_attributes)
+{
+    client().async_replace_dom_node_attribute(node_id, move(name), move(replacement_attributes));
+}
+
 void ViewImplementation::debug_request(DeprecatedString const& request, DeprecatedString const& argument)
 {
     client().async_debug_request(request, argument);

Userland/Libraries/LibWebView/ViewImplementation.h

@@ -63,6 +63,10 @@ public:
     void clear_inspected_dom_node();
     i32 get_hovered_node_id();
 
+    void set_dom_node_text(i32 node_id, String text);
+    Optional<i32> set_dom_node_tag(i32 node_id, String name);
+    void replace_dom_node_attribute(i32 node_id, String name, Vector<Attribute> replacement_attributes);
+
     void debug_request(DeprecatedString const& request, DeprecatedString const& argument = {});
 
     void run_javascript(StringView);