From dfdc2ddb9eb45aa305a13511eed9dd417455e5a8 Mon Sep 17 00:00:00 2001
From: Luke Wilde <lukew@serenityos.org>
Date: Mon, 31 Jan 2022 18:33:41 +0000
Subject: [PATCH] LibWeb: Implement Range.selectNode

---
 Userland/Libraries/LibWeb/DOM/Range.cpp | 31 +++++++++++++++++++++++++
 Userland/Libraries/LibWeb/DOM/Range.h   |  2 ++
 Userland/Libraries/LibWeb/DOM/Range.idl |  1 +
 3 files changed, 34 insertions(+)

diff --git a/Userland/Libraries/LibWeb/DOM/Range.cpp b/Userland/Libraries/LibWeb/DOM/Range.cpp
index 9c4c25ca8d..e30c2b519e 100644
--- a/Userland/Libraries/LibWeb/DOM/Range.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Range.cpp
@@ -314,6 +314,37 @@ ExceptionOr<i16> Range::compare_boundary_points(u16 how, Range const& source_ran
     }
 }
 
+// https://dom.spec.whatwg.org/#concept-range-select
+ExceptionOr<void> Range::select(Node& node)
+{
+    // 1. Let parent be node’s parent.
+    auto* parent = node.parent();
+
+    // 2. If parent is null, then throw an "InvalidNodeTypeError" DOMException.
+    if (!parent)
+        return InvalidNodeTypeError::create("Given node has no parent.");
+
+    // 3. Let index be node’s index.
+    auto index = node.index();
+
+    // 4. Set range’s start to boundary point (parent, index).
+    m_start_container = *parent;
+    m_start_offset = index;
+
+    // 5. Set range’s end to boundary point (parent, index plus 1).
+    m_end_container = *parent;
+    m_end_offset = index + 1;
+
+    return {};
+}
+
+// https://dom.spec.whatwg.org/#dom-range-selectnode
+ExceptionOr<void> Range::select_node(Node& node)
+{
+    // The selectNode(node) method steps are to select node within this.
+    return select(node);
+}
+
 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));
diff --git a/Userland/Libraries/LibWeb/DOM/Range.h b/Userland/Libraries/LibWeb/DOM/Range.h
index e23814e428..9b10cf2f4c 100644
--- a/Userland/Libraries/LibWeb/DOM/Range.h
+++ b/Userland/Libraries/LibWeb/DOM/Range.h
@@ -30,6 +30,7 @@ public:
     ExceptionOr<void> set_start_after(Node& node);
     ExceptionOr<void> set_end_before(Node& node);
     ExceptionOr<void> set_end_after(Node& node);
+    ExceptionOr<void> select_node(Node& node);
 
     // https://dom.spec.whatwg.org/#dom-range-start_to_start
     enum HowToCompareBoundaryPoints : u16 {
@@ -61,6 +62,7 @@ private:
     };
 
     ExceptionOr<void> set_start_or_end(Node& node, u32 offset, StartOrEnd start_or_end);
+    ExceptionOr<void> select(Node& node);
 };
 
 }
diff --git a/Userland/Libraries/LibWeb/DOM/Range.idl b/Userland/Libraries/LibWeb/DOM/Range.idl
index 0faaddfcc9..d5fb24f1a7 100644
--- a/Userland/Libraries/LibWeb/DOM/Range.idl
+++ b/Userland/Libraries/LibWeb/DOM/Range.idl
@@ -14,6 +14,7 @@ interface Range : AbstractRange {
     undefined setStartAfter(Node node);
     undefined setEndBefore(Node node);
     undefined setEndAfter(Node node);
+    undefined selectNode(Node node);
 
     const unsigned short START_TO_START = 0;
     const unsigned short START_TO_END = 1;