From 972e9ac0fb53cdeb4fcce082e4c1c1d8683608df Mon Sep 17 00:00:00 2001
From: Manish Goregaokar <manishsmail@gmail.com>
Date: Tue, 15 Nov 2016 17:12:04 -0800
Subject: [PATCH] Add support for LinkStyle's sheet getter on <style> and
 <link>

---
 components/script/dom/htmllinkelement.rs              | 6 ++++++
 components/script/dom/htmlstyleelement.rs             | 9 +++++++++
 components/script/dom/webidls/HTMLLinkElement.webidl  | 2 +-
 components/script/dom/webidls/HTMLStyleElement.webidl | 2 +-
 components/script/dom/webidls/StyleSheet.webidl       | 6 ++++++
 5 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/components/script/dom/htmllinkelement.rs b/components/script/dom/htmllinkelement.rs
index d1f6d8e957f..f311d022470 100644
--- a/components/script/dom/htmllinkelement.rs
+++ b/components/script/dom/htmllinkelement.rs
@@ -22,6 +22,7 @@ use dom::eventtarget::EventTarget;
 use dom::globalscope::GlobalScope;
 use dom::htmlelement::HTMLElement;
 use dom::node::{Node, document_from_node, window_from_node};
+use dom::stylesheet::StyleSheet as DOMStyleSheet;
 use dom::virtualmethods::VirtualMethods;
 use encoding::EncodingRef;
 use encoding::all::UTF_8;
@@ -452,4 +453,9 @@ impl HTMLLinkElementMethods for HTMLLinkElement {
 
     // https://html.spec.whatwg.org/multipage/#dom-link-target
     make_setter!(SetTarget, "target");
+
+    // https://drafts.csswg.org/cssom/#dom-linkstyle-sheet
+    fn GetSheet(&self) -> Option<Root<DOMStyleSheet>> {
+        self.get_cssom_stylesheet().map(Root::upcast)
+    }
 }
diff --git a/components/script/dom/htmlstyleelement.rs b/components/script/dom/htmlstyleelement.rs
index d65153bee31..6a20bf06cdd 100644
--- a/components/script/dom/htmlstyleelement.rs
+++ b/components/script/dom/htmlstyleelement.rs
@@ -5,6 +5,7 @@
 use cssparser::Parser as CssParser;
 use dom::bindings::cell::DOMRefCell;
 use dom::bindings::codegen::Bindings::HTMLStyleElementBinding;
+use dom::bindings::codegen::Bindings::HTMLStyleElementBinding::HTMLStyleElementMethods;
 use dom::bindings::codegen::Bindings::NodeBinding::NodeMethods;
 use dom::bindings::inheritance::Castable;
 use dom::bindings::js::{JS, MutNullableHeap, Root};
@@ -14,6 +15,7 @@ use dom::document::Document;
 use dom::element::Element;
 use dom::htmlelement::HTMLElement;
 use dom::node::{ChildrenMutation, Node, document_from_node, window_from_node};
+use dom::stylesheet::StyleSheet as DOMStyleSheet;
 use dom::virtualmethods::VirtualMethods;
 use html5ever_atoms::LocalName;
 use script_layout_interface::message::Msg;
@@ -117,3 +119,10 @@ impl VirtualMethods for HTMLStyleElement {
         }
     }
 }
+
+impl HTMLStyleElementMethods for HTMLStyleElement {
+    // https://drafts.csswg.org/cssom/#dom-linkstyle-sheet
+    fn GetSheet(&self) -> Option<Root<DOMStyleSheet>> {
+        self.get_cssom_stylesheet().map(Root::upcast)
+    }
+}
diff --git a/components/script/dom/webidls/HTMLLinkElement.webidl b/components/script/dom/webidls/HTMLLinkElement.webidl
index 8c1bf496590..e7bec059efe 100644
--- a/components/script/dom/webidls/HTMLLinkElement.webidl
+++ b/components/script/dom/webidls/HTMLLinkElement.webidl
@@ -15,7 +15,7 @@ interface HTMLLinkElement : HTMLElement {
 
   // also has obsolete members
 };
-//HTMLLinkElement implements LinkStyle;
+HTMLLinkElement implements LinkStyle;
 
 // https://html.spec.whatwg.org/multipage/#HTMLLinkElement-partial
 partial interface HTMLLinkElement {
diff --git a/components/script/dom/webidls/HTMLStyleElement.webidl b/components/script/dom/webidls/HTMLStyleElement.webidl
index dd766f41d22..78926c2c1a8 100644
--- a/components/script/dom/webidls/HTMLStyleElement.webidl
+++ b/components/script/dom/webidls/HTMLStyleElement.webidl
@@ -8,4 +8,4 @@ interface HTMLStyleElement : HTMLElement {
   //         attribute DOMString type;
   //         attribute boolean scoped;
 };
-//HTMLStyleElement implements LinkStyle;
+HTMLStyleElement implements LinkStyle;
diff --git a/components/script/dom/webidls/StyleSheet.webidl b/components/script/dom/webidls/StyleSheet.webidl
index a63e2a41f01..336bc6b282c 100644
--- a/components/script/dom/webidls/StyleSheet.webidl
+++ b/components/script/dom/webidls/StyleSheet.webidl
@@ -15,3 +15,9 @@ interface StyleSheet {
   // [SameObject, PutForwards=mediaText] readonly attribute MediaList media;
   // attribute boolean disabled;
 };
+
+// https://drafts.csswg.org/cssom/#the-linkstyle-interface
+[NoInterfaceObject]
+interface LinkStyle {
+  readonly attribute StyleSheet? sheet;
+};