Move aux pointer initialization to layout::aux

src/servo/css/styles.rs

@@ -2,51 +2,16 @@
  * High-level interface to CSS selector matching.
  */
 use std::arc::{ARC, get, clone};
-use dom::node::{Node, LayoutData, NodeTree};
-use core::dvec::DVec;
-use newcss::values::*;
+use dom::node::{Node, NodeTree};
 use newcss::{SelectCtx, SelectResults};
-use newcss::color::{Color, rgb};
-use newcss::color::css_colors::{white, black};
 use layout::context::LayoutContext;
 use select_handler::NodeSelectHandler;
 
 trait StyleMethods {
-    fn initialize_layout_data() -> Option<@LayoutData>;
-    fn initialize_style_for_subtree(ctx: &LayoutContext, refs: &DVec<@LayoutData>);
     fn recompute_style_for_subtree(ctx: &LayoutContext, select_ctx: &SelectCtx);
 }
 
 impl Node : StyleMethods {
-    /** If none exists, creates empty layout data for the node (the reader-auxiliary
-     * box in the COW model) and populates it with an empty style object.
-     */
-    fn initialize_layout_data() -> Option<@LayoutData> {
-        match self.has_aux() {
-            false => {
-                let data = @LayoutData({
-                    mut style : None,
-                    mut flow  : None
-                });
-                self.set_aux(data); Some(data)
-            },
-            true => None
-        }
-    }
-
-    /**
-     * Initializes layout data and styles for a Node tree, if any nodes do not have
-     * this data already. Append created layout data to the task's GC roots.
-     */
-    fn initialize_style_for_subtree(_ctx: &LayoutContext, refs: &DVec<@LayoutData>) {
-        do self.traverse_preorder |n| {
-            match n.initialize_layout_data() {
-                Some(r) => refs.push(r),
-                None => {}
-            }
-        }
-    }
-
     /**
      * Performs CSS selector matching on a subtree.
 

src/servo/layout/aux.rs

@@ -0,0 +1,43 @@
+/**
+Code for managing the DOM aux pointer
+*/
+
+use dom::node::{Node, LayoutData};
+use core::dvec::DVec;
+
+pub trait LayoutAuxMethods {
+    fn initialize_layout_data() -> Option<@LayoutData>;
+    fn initialize_style_for_subtree(refs: &DVec<@LayoutData>);
+}
+
+impl Node : LayoutAuxMethods {
+    /** If none exists, creates empty layout data for the node (the reader-auxiliary
+     * box in the COW model) and populates it with an empty style object.
+     */
+    fn initialize_layout_data() -> Option<@LayoutData> {
+        match self.has_aux() {
+            false => {
+                let data = @LayoutData({
+                    mut style : None,
+                    mut flow  : None
+                });
+                self.set_aux(data); Some(data)
+            },
+            true => None
+        }
+    }
+
+    /**
+     * Initializes layout data and styles for a Node tree, if any nodes do not have
+     * this data already. Append created layout data to the task's GC roots.
+     */
+    fn initialize_style_for_subtree(refs: &DVec<@LayoutData>) {
+        do self.traverse_preorder |n| {
+            match n.initialize_layout_data() {
+                Some(r) => refs.push(r),
+                None => {}
+            }
+        }
+    }
+
+}

src/servo/layout/layout_task.rs

@@ -173,7 +173,7 @@ impl Layout {
 
         let layout_root: @FlowContext = do time("layout: tree construction") {
             // TODO: this is dumb. we don't need 2 separate traversals.
-            node.initialize_style_for_subtree(&layout_ctx, &self.layout_refs);
+            node.initialize_style_for_subtree(&self.layout_refs);
             do self.css_select_ctx.borrow_imm |ctx| {
                 node.recompute_style_for_subtree(&layout_ctx, ctx);
             }

src/servo/servo.rc

@@ -64,6 +64,7 @@ pub mod layout {
     pub mod root;
     pub mod text;
     pub mod traverse;
+    mod aux;
 }
 
 pub mod gfx {