Implement Text.splitText()

1 files changed, 41 insertions, 2 deletions

diff --git a/components/script/dom/text.rs b/components/script/dom/text.rs
index 5df59274e9e..1698377f4bd 100644
--- a/components/script/dom/text.rs
+++ b/components/script/dom/text.rs
@@ -3,12 +3,15 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use dom::bindings::codegen::Bindings::TextBinding::{self, TextMethods};
+use dom::bindings::codegen::Bindings::CharacterDataBinding::CharacterDataMethods;
+use dom::bindings::codegen::Bindings::DocumentBinding::DocumentMethods;
+use dom::bindings::codegen::Bindings::NodeBinding::NodeMethods;
 use dom::bindings::codegen::Bindings::WindowBinding::WindowMethods;
 use dom::bindings::codegen::InheritTypes::{CharacterDataCast, TextDerived};
 use dom::bindings::codegen::InheritTypes::NodeCast;
-use dom::bindings::error::Fallible;
+use dom::bindings::error::{Error, Fallible};
 use dom::bindings::global::GlobalRef;
-use dom::bindings::js::{JSRef, Temporary};
+use dom::bindings::js::{JSRef, OptionalRootable, RootedReference, Temporary};
 use dom::characterdata::{CharacterData, CharacterDataHelpers};
 use dom::document::Document;
 use dom::eventtarget::{EventTarget, EventTargetTypeId};
@@ -46,6 +49,42 @@ impl Text {
 }
 
 impl<'a> TextMethods for JSRef<'a, Text> {
+    // https://dom.spec.whatwg.org/#dom-text-splittextoffset
+    fn SplitText(self, offset: u32) -> Fallible<Temporary<Text>> {
+        let cdata = CharacterDataCast::from_ref(self);
+        // Step 1.
+        let length = cdata.Length();
+        if offset > length {
+            // Step 2.
+            return Err(Error::IndexSize);
+        }
+        // Step 3.
+        let count = length - offset;
+        // Step 4.
+        let new_data = cdata.SubstringData(offset, count).unwrap();
+        // Step 5.
+        let node = NodeCast::from_ref(self);
+        let owner_doc = node.owner_doc().root();
+        let new_node = owner_doc.r().CreateTextNode(new_data).root();
+        // Step 6.
+        let parent = node.parent_node().root();
+        if let Some(ref parent) = parent {
+            // Step 7.
+            parent.r().InsertBefore(NodeCast::from_ref(new_node.r()),
+                                    node.next_sibling().root().r())
+                  .unwrap();
+            // TODO: Ranges.
+        }
+        // Step 8.
+        cdata.DeleteData(offset, count).unwrap();
+        if parent.is_none() {
+            // Step 9.
+            // TODO: Ranges
+        }
+        // Step 10.
+        Ok(Temporary::from_rooted(new_node.r()))
+    }
+
     // https://dom.spec.whatwg.org/#dom-text-wholetext
     fn WholeText(self) -> DOMString {
         let first = NodeCast::from_ref(self).inclusively_preceding_siblings()