LibWeb: Implement Range.selectNodeContents

Userland/Libraries/LibWeb/DOM/Range.cpp

@@ -359,6 +359,27 @@ void Range::collapse(bool to_start)
     m_start_offset = m_end_offset;
 }
 
+// https://dom.spec.whatwg.org/#dom-range-selectnodecontents
+ExceptionOr<void> Range::select_node_contents(Node const& node)
+{
+    // 1. If node is a doctype, throw an "InvalidNodeTypeError" DOMException.
+    if (is<DocumentType>(node))
+        return InvalidNodeTypeError::create("Node cannot be a DocumentType.");
+
+    // 2. Let length be the length of node.
+    auto length = node.length();
+
+    // 3. Set start to the boundary point (node, 0).
+    m_start_container = node;
+    m_start_offset = 0;
+
+    // 4. Set end to the boundary point (node, length).
+    m_end_container = node;
+    m_end_offset = length;
+
+    return {};
+}
+
 NonnullRefPtr<Range> Range::clone_range() const
 {
     return adopt_ref(*new Range(const_cast<Node&>(*m_start_container), m_start_offset, const_cast<Node&>(*m_end_container), m_end_offset));

Userland/Libraries/LibWeb/DOM/Range.h

@@ -32,6 +32,7 @@ public:
     ExceptionOr<void> set_end_after(Node& node);
     ExceptionOr<void> select_node(Node& node);
     void collapse(bool to_start);
+    ExceptionOr<void> select_node_contents(Node const&);
 
     // https://dom.spec.whatwg.org/#dom-range-start_to_start
     enum HowToCompareBoundaryPoints : u16 {

Userland/Libraries/LibWeb/DOM/Range.idl

@@ -16,6 +16,7 @@ interface Range : AbstractRange {
     undefined setEndAfter(Node node);
     undefined collapse(optional boolean toStart = false);
     undefined selectNode(Node node);
+    undefined selectNodeContents(Node node);
 
     const unsigned short START_TO_START = 0;
     const unsigned short START_TO_END = 1;