From ee719870c84c90769c831ef3a8678aa72a219947 Mon Sep 17 00:00:00 2001
From: Luke Wilde <lukew@serenityos.org>
Date: Mon, 11 Jul 2022 16:23:50 +0100
Subject: [PATCH] LibWeb: Implement CharacterData.{append,insert,delete}Data

---
 .../Libraries/LibWeb/DOM/CharacterData.cpp    | 21 +++++++++++++++++++
 Userland/Libraries/LibWeb/DOM/CharacterData.h |  3 +++
 .../Libraries/LibWeb/DOM/CharacterData.idl    |  3 +++
 3 files changed, 27 insertions(+)

diff --git a/Userland/Libraries/LibWeb/DOM/CharacterData.cpp b/Userland/Libraries/LibWeb/DOM/CharacterData.cpp
index 13ba46eacb8..aaf5e79e6f7 100644
--- a/Userland/Libraries/LibWeb/DOM/CharacterData.cpp
+++ b/Userland/Libraries/LibWeb/DOM/CharacterData.cpp
@@ -103,4 +103,25 @@ ExceptionOr<void> CharacterData::replace_data(size_t offset, size_t count, Strin
     return {};
 }
 
+// https://dom.spec.whatwg.org/#dom-characterdata-appenddata
+ExceptionOr<void> CharacterData::append_data(String const& data)
+{
+    // The appendData(data) method steps are to replace data with node this, offset this’s length, count 0, and data data.
+    return replace_data(m_data.length(), 0, data);
+}
+
+// https://dom.spec.whatwg.org/#dom-characterdata-insertdata
+ExceptionOr<void> CharacterData::insert_data(size_t offset, String const& data)
+{
+    // The insertData(offset, data) method steps are to replace data with node this, offset offset, count 0, and data data.
+    return replace_data(offset, 0, data);
+}
+
+// https://dom.spec.whatwg.org/#dom-characterdata-deletedata
+ExceptionOr<void> CharacterData::delete_data(size_t offset, size_t count)
+{
+    // The deleteData(offset, count) method steps are to replace data with node this, offset offset, count count, and data the empty string.
+    return replace_data(offset, count, String::empty());
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/DOM/CharacterData.h b/Userland/Libraries/LibWeb/DOM/CharacterData.h
index d72d5bdfc4b..5765ee3f3da 100644
--- a/Userland/Libraries/LibWeb/DOM/CharacterData.h
+++ b/Userland/Libraries/LibWeb/DOM/CharacterData.h
@@ -28,6 +28,9 @@ public:
     unsigned length() const { return m_data.length(); }
 
     ExceptionOr<String> substring_data(size_t offset, size_t count) const;
+    ExceptionOr<void> append_data(String const&);
+    ExceptionOr<void> insert_data(size_t offset, String const&);
+    ExceptionOr<void> delete_data(size_t offset, size_t count);
     ExceptionOr<void> replace_data(size_t offset, size_t count, String const&);
 
 protected:
diff --git a/Userland/Libraries/LibWeb/DOM/CharacterData.idl b/Userland/Libraries/LibWeb/DOM/CharacterData.idl
index 15b7af0825e..856f9c16a37 100644
--- a/Userland/Libraries/LibWeb/DOM/CharacterData.idl
+++ b/Userland/Libraries/LibWeb/DOM/CharacterData.idl
@@ -7,6 +7,9 @@ interface CharacterData : Node {
     readonly attribute unsigned long length;
 
     DOMString substringData(unsigned long offset, unsigned long count);
+    undefined appendData(DOMString data);
+    undefined insertData(unsigned long offset, DOMString data);
+    undefined deleteData(unsigned long offset, unsigned long count);
     undefined replaceData(unsigned long offset, unsigned long count, DOMString data);
 
     readonly attribute Element? nextElementSibling;