styling: added preliminary styling application

src/dom.rs

@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use std::collections::{HashMap,HashSet};
 use std;
 
 use css;
@@ -7,17 +7,30 @@ pub struct Attr {
   attrs: HashMap<String, String>,
 }
 
-struct EData {
-    name: String,
-    attr: Attr,
+pub struct EData {
+    pub name: String,
+    pub attr: Attr,
 }
 
-struct SData {
+impl EData {
+    pub fn id(&self) -> Option<&String> {
+        self.attr.attrs.get("id")
+    }
+
+    pub fn classes(&self) -> HashSet<&str> {
+        match self.attr.attrs.get("class") {
+            Some(classlist) => classlist.split(' ').collect(),
+            None => HashSet::new()
+        }
+    }
+}
+
+pub struct SData {
     attr: Attr,
     content: css::Stylesheet,
 }
 
-enum NType {
+pub enum NType {
     Text(String),
     Comment(String),
     Element(EData),
@@ -25,8 +38,8 @@ enum NType {
 }
 
 pub struct Node {
-    children: Vec<Node>,
-    ntype: NType,
+    pub children: Vec<Node>,
+    pub ntype: NType,
 }
 
 pub fn text(d: String) -> Node {