Move the box builder to a separate module

src/servo/layout/base.rs

@@ -50,28 +50,6 @@ impl of tree::wr_tree_ops<@box> for btree {
     }
 }
 
-fn new_box(n: node) -> @box {
-    @box({tree: tree::empty(),
-          node: n,
-          mut display: di_block,
-          mut bounds: geom::zero_rect_au()})
-}
-
-fn linked_box(n: node) -> @box {
-    let b = new_box(n);
-    n.set_aux(b);
-    ret b;
-}
-
-fn linked_subtree(p: node) -> @box {
-    let p_box = linked_box(p);
-    for ntree.each_child(p) { |c|
-        let c_box = linked_subtree(c);
-        btree.add_child(p_box, c_box);
-    }
-    ret p_box;
-}
-
 impl block_layout_methods for @box {
     #[doc="The main reflow routine."]
     fn reflow(available_width: au) {

src/servo/layout/box_builder.rs

@@ -0,0 +1,39 @@
+#[doc="Creates CSS boxes from a DOM."]
+
+import dom::base::node;
+import dom::rcu::reader_methods;
+import gfx::geom;
+import /*layout::*/base::{box, btree, di_block, di_inline, ntree, rd_tree_ops};
+import /*layout::*/base::wr_tree_ops;
+import util::tree;
+
+export box_builder_methods;
+
+fn new_box(n: node) -> @box {
+    @box({tree: tree::empty(),
+          node: n,
+          mut display: di_block,
+          mut bounds: geom::zero_rect_au()})
+}
+
+impl box_builder_priv_methods for node {
+    fn construct_boxes() -> @box {
+        let b = new_box(self);
+        self.set_aux(b);
+        ret b;
+    }
+}
+
+impl box_builder_methods for node {
+    #[doc="Creates boxes for a subtree. This is the entry point."]
+    fn construct_boxes_for_subtree() -> @box {
+        let p_box = self.construct_boxes();
+        for ntree.each_child(self) {
+            |c|
+            let c_box = c.construct_boxes_for_subtree();
+            btree.add_child(p_box, c_box);
+        }
+        ret p_box;
+    }
+}
+

src/servo/layout/layout.rs

@@ -11,8 +11,8 @@ import gfx::geom;
 import gfx::renderer;
 import dom::base::node;
 import dom::rcu::scope;
-import base::{btree, rd_tree_ops, wr_tree_ops, linked_subtree};
-import base::block_layout_methods;
+import base::*;
+import box_builder::box_builder_methods;
 import dl = display_list;
 
 enum msg {
@@ -29,9 +29,9 @@ fn layout(to_renderer: chan<renderer::msg>) -> chan<msg> {
               exit { break; }
               build(node) {
                 #debug("layout: received layout request");
-                let box = linked_subtree(node);
-                box.reflow(geom::px_to_au(800));
-                let dlist = build_display_list(box);
+                let this_box = node.construct_boxes_for_subtree();
+                this_box.reflow(geom::px_to_au(800));
+                let dlist = build_display_list(this_box);
                 to_renderer.send(renderer::render(dlist));
               }
             }

src/servo/servo.rc

@@ -31,6 +31,7 @@ mod image {
 
 mod layout {
     mod base;
+    mod box_builder;
     mod display_list;
     mod inline;
     mod layout;