Factor out elements into a generic type

src/servo/dom/base.rs

@@ -5,15 +5,29 @@ import util::tree;
 
 enum node_data = {
     tree: tree::fields<node>,
-    kind: node_kind,
+    kind: ~node_kind,
 };
 
 enum node_kind {
-    nk_div,
-    nk_img(size<au>),
+    nk_element(element),
     nk_text(str)
 }
 
+class element {
+    let tag_name: str;
+    let subclass: ~element_subclass;
+
+    new(tag_name: str, -subclass: ~element_subclass) {
+        self.tag_name = tag_name;
+        self.subclass = subclass;
+    }
+}
+
+enum element_subclass {
+    es_div,
+    es_img(size<au>)
+}
+
 #[doc="The rd_aux data is a (weak) pointer to the layout data, which contains
        the CSS info as well as the primary box.  Note that there may be multiple
        boxes per DOM node."]
@@ -24,9 +38,9 @@ type node_scope = rcu::scope<node_data, layout_data>;
 fn node_scope() -> node_scope { rcu::scope() }
 
 impl methods for node_scope {
-    fn new_node(+k: node_kind) -> node {
+    fn new_node(-k: node_kind) -> node {
         self.handle(node_data({tree: tree::empty(),
-                               kind: k}))
+                               kind: ~k}))
     }
 }
 

src/servo/layout/base.rs

@@ -1,6 +1,6 @@
 #[doc="Fundamental layout structures and algorithms."]
 
-import dom::base::{nk_div, nk_img, node_data, node_kind, node};
+import dom::base::{element, es_div, es_img, node_data, node_kind, node};
 import dom::rcu;
 import dom::rcu::reader_methods;
 import gfx::geom;

src/servo/layout/box_builder.rs

@@ -1,6 +1,6 @@
 #[doc="Creates CSS boxes from a DOM."]
 
-import dom::base::{nk_div, nk_img, nk_text, node};
+import dom::base::{element, es_div, es_img, nk_element, nk_text, node};
 import dom::rcu::reader_methods;
 import gfx::geom;
 import /*layout::*/base::{bk_block, bk_inline, bk_intrinsic, bk_text, box};
@@ -119,9 +119,13 @@ impl box_builder_priv for node {
     "]
     fn determine_box_kind() -> box_kind {
         alt self.rd({ |n| n.kind }) {
-            nk_img(size) { bk_intrinsic(@size)   }
-            nk_div       { bk_block              }
-            nk_text(s)   { bk_text(@text_box(s)) }
+            ~nk_text(string) { bk_text(@text_box(string)) }
+            ~nk_element(element) {
+                alt *element.subclass {
+                    es_div       { bk_block            }
+                    es_img(size) { bk_intrinsic(@size) }
+                }
+            }
         }
     }
 }

src/servo/layout/style/style.rs

@@ -1,6 +1,7 @@
 #[doc="High-level interface to CSS selector matching."]
 
-import dom::base::{nk_div, nk_img, nk_text, node, node_kind};
+import dom::base::{element, es_div, es_img, nk_element, nk_text, node};
+import dom::base::node_kind;
 import dom::rcu::reader_methods;
 import /*layout::*/base::*; // FIXME: resolve bug requires *
 
@@ -14,12 +15,17 @@ enum display {
 }
 
 #[doc="Returns the default style for the given node kind."]
-fn default_style_for_node_kind(kind : node_kind) -> computed_style {
+fn default_style_for_node_kind(kind: node_kind) -> computed_style {
     alt kind {
-        nk_div { computed_style({ mut display: di_block }) }
-        nk_img(*) | nk_text(*) {
+        nk_text(*) {
             computed_style({ mut display: di_inline })
         }
+        nk_element(element) {
+            alt *element.subclass {
+                es_div { computed_style({ mut display: di_block }) }
+                es_img(*) { computed_style({ mut display: di_inline }) }
+            }
+        }
     }
 }
 
@@ -33,7 +39,7 @@ impl style_priv for node {
     "]
     fn recompute_style() {
         let default_style: computed_style =
-            default_style_for_node_kind(self.rd { |n| n.kind });
+            default_style_for_node_kind(self.rd { |n| *n.kind });
 
         #debug("recomputing style; parent node:");
         self.dump();

src/servo/parser/html_builder.rs

@@ -1,7 +1,8 @@
 #[doc="Constructs a DOM tree from an incoming token stream."]
 
 import dom::rcu::writer_methods;
-import dom::base::{methods, rd_tree_ops, wr_tree_ops};
+import dom::base::{element, es_div, es_img, methods, nk_element, nk_text};
+import dom::base::{rd_tree_ops, wr_tree_ops};
 import dom = dom::base;
 import parser = parser::html;
 import html::token;
@@ -11,24 +12,28 @@ fn link_up_attribute(scope: dom::node_scope, node: dom::node, key: str,
                      value: str) {
     // TODO: Implement atoms so that we don't always perform string
     // comparisons.
-    // FIXME: This is wrong... we should not have DIV and IMG be separate types
-    // of nodes and instead have them inherit from Element, obviously.
     scope.rd(node) {
         |node_contents|
-        alt node_contents.kind {
-            dom::nk_img(dims) if key == "width" {
-                alt int::from_str(value) {
-                    none { /* drop on the floor */ }
-                    some(s) { dims.width = geom::px_to_au(s); }
+        alt *node_contents.kind {
+            dom::nk_element(element) {
+                alt *element.subclass {
+                    es_img(dimensions) if key == "width" {
+                        alt int::from_str(value) {
+                            none { /* drop on the floor */ }
+                            some(s) { dimensions.width = geom::px_to_au(s); }
+                        }
+                    }
+                    es_img(dimensions) if key == "height" {
+                        alt int::from_str(value) {
+                            none { /* drop on the floor */ }
+                            some(s) { dimensions.height = geom::px_to_au(s); }
+                        }
+                    }
+                    es_div | es_img(*) {
+                        // Drop on the floor.
+                    }
                 }
             }
-            dom::nk_img(dims) if key == "height" {
-                alt int::from_str(value) {
-                    none { /* drop on the floor */ }
-                    some(s) { dims.height = geom::px_to_au(s); }
-                }
-            }
-            dom::nk_div | dom::nk_img(*) { /* drop on the floor */ }
             dom::nk_text(*) {
                 fail "attempt to link up an attribute to a text node"
             }
@@ -39,7 +44,7 @@ fn link_up_attribute(scope: dom::node_scope, node: dom::node, key: str,
 fn build_dom(scope: dom::node_scope,
              stream: port<token>) -> dom::node {
     // The current reference node.
-    let mut cur = scope.new_node(dom::nk_div);
+    let mut cur = scope.new_node(dom::nk_element(element("html", ~es_div)));
     loop {
         let token = stream.recv();
         #debug["token=%?", token];
@@ -47,16 +52,17 @@ fn build_dom(scope: dom::node_scope,
             parser::to_eof { break; }
             parser::to_start_opening_tag("div") {
                 #debug["DIV"];
-                let new_node = scope.new_node(
-                    dom::nk_div);
+                let new_node =
+                    scope.new_node(dom::nk_element(element("div", ~es_div)));
                 scope.add_child(cur, new_node);
                 cur = new_node;
             }
             parser::to_start_opening_tag("img") {
                 #debug["IMG"];
-                let new_node = scope.new_node(
-                    dom::nk_img({mut width: geom::px_to_au(100),
-                                 mut height: geom::px_to_au(100)}));
+                let new_node =
+                    scope.new_node(dom::nk_element(element("img",
+                        ~es_img({mut width: geom::px_to_au(100),
+                                 mut height: geom::px_to_au(100)}))));
                 scope.add_child(cur, new_node);
                 cur = new_node;
             }