Implement support for parsed attributes.

This commit is heavily based on earlier work by Bruno Abinader in #2073.

src/components/script/dom/attr.rs

@@ -6,13 +6,13 @@ use dom::bindings::codegen::Bindings::AttrBinding;
 use dom::bindings::codegen::InheritTypes::NodeCast;
 use dom::bindings::js::{JS, JSRef, Temporary};
 use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
-use dom::element::Element;
+use dom::element::{Element, AttributeHandlers};
 use dom::node::Node;
 use dom::window::Window;
 use dom::virtualmethods::vtable_for;
 use servo_util::namespace;
 use servo_util::namespace::Namespace;
-use servo_util::str::DOMString;
+use servo_util::str::{DOMString, HTML_SPACE_CHARACTERS};
 use std::cell::Cell;
 
 pub enum AttrSettingType {
@@ -20,11 +20,38 @@ pub enum AttrSettingType {
     ReplacedAttr,
 }
 
+#[deriving(Eq, Clone, Encodable)]
+pub enum AttrValue {
+    StringAttrValue(DOMString),
+    TokenListAttrValue(DOMString, Vec<(uint, uint)>),
+}
+
+impl AttrValue {
+    pub fn from_tokenlist(list: DOMString) -> AttrValue {
+        let mut indexes = vec![];
+        let mut last_index: uint = 0;
+        for (index, ch) in list.as_slice().char_indices() {
+            if HTML_SPACE_CHARACTERS.iter().any(|&space| space == ch) {
+                indexes.push((last_index, index));
+                last_index = index + 1;
+            }
+        }
+        return TokenListAttrValue(list, indexes);
+    }
+
+    pub fn as_slice<'a>(&'a self) -> &'a str {
+        match *self {
+            StringAttrValue(ref value) |
+            TokenListAttrValue(ref value, _) => value.as_slice(),
+        }
+    }
+}
+
 #[deriving(Encodable)]
 pub struct Attr {
     pub reflector_: Reflector,
     pub local_name: DOMString,
-    value: DOMString,
+    value: AttrValue,
     pub name: DOMString,
     pub namespace: Namespace,
     pub prefix: Option<DOMString>,
@@ -44,7 +71,7 @@ impl Reflectable for Attr {
 }
 
 impl Attr {
-    fn new_inherited(local_name: DOMString, value: DOMString,
+    fn new_inherited(local_name: DOMString, value: AttrValue,
                      name: DOMString, namespace: Namespace,
                      prefix: Option<DOMString>, owner: &JSRef<Element>) -> Attr {
         Attr {
@@ -58,14 +85,14 @@ impl Attr {
         }
     }
 
-    pub fn new(window: &JSRef<Window>, local_name: DOMString, value: DOMString,
+    pub fn new(window: &JSRef<Window>, local_name: DOMString, value: AttrValue,
                name: DOMString, namespace: Namespace,
                prefix: Option<DOMString>, owner: &JSRef<Element>) -> Temporary<Attr> {
         let attr = Attr::new_inherited(local_name, value, name, namespace, prefix, owner);
         reflect_dom_object(box attr, window, AttrBinding::Wrap)
     }
 
-    pub fn set_value(&mut self, set_type: AttrSettingType, value: DOMString) {
+    pub fn set_value(&mut self, set_type: AttrSettingType, value: AttrValue) {
         let owner = self.owner.get().root();
         let node: &JSRef<Node> = NodeCast::from_ref(&*owner);
         let namespace_is_null = self.namespace == namespace::Null;
@@ -73,7 +100,7 @@ impl Attr {
         match set_type {
             ReplacedAttr => {
                 if namespace_is_null {
-                    vtable_for(node).before_remove_attr(self.local_name.clone(), self.value.clone());
+                    vtable_for(node).before_remove_attr(self.local_name.clone(), self.value.as_slice().to_string());
                 }
             }
             FirstSetAttr => {}
@@ -82,10 +109,14 @@ impl Attr {
         self.value = value;
 
         if namespace_is_null {
-            vtable_for(node).after_set_attr(self.local_name.clone(), self.value.clone());
+            vtable_for(node).after_set_attr(self.local_name.clone(), self.value.as_slice().to_string());
         }
     }
 
+    pub fn value<'a>(&'a self) -> &'a AttrValue {
+        &self.value
+    }
+
     pub fn value_ref<'a>(&'a self) -> &'a str {
         self.value.as_slice()
     }
@@ -106,10 +137,13 @@ impl<'a> AttrMethods for JSRef<'a, Attr> {
     }
 
     fn Value(&self) -> DOMString {
-        self.value.clone()
+        self.value.as_slice().to_string()
     }
 
     fn SetValue(&mut self, value: DOMString) {
+        let owner = self.owner.get().root();
+        let value = owner.deref().parse_attribute(
+            &self.namespace, self.deref().local_name.as_slice(), value);
         self.set_value(ReplacedAttr, value);
     }
 

src/components/script/dom/element.rs

@@ -5,6 +5,7 @@
 //! Element nodes.
 
 use dom::attr::{Attr, ReplacedAttr, FirstSetAttr, AttrMethods};
+use dom::attr::{AttrValue, StringAttrValue};
 use dom::attrlist::AttrList;
 use dom::bindings::codegen::Bindings::ElementBinding;
 use dom::bindings::codegen::InheritTypes::{ElementDerived, NodeCast};
@@ -222,10 +223,12 @@ pub trait AttributeHandlers {
     fn set_attribute_from_parser(&self, local_name: DOMString,
                                  value: DOMString, namespace: Namespace,
                                  prefix: Option<DOMString>);
-    fn set_attribute(&self, name: &str, value: DOMString);
+    fn set_attribute(&self, name: &str, value: AttrValue);
-    fn do_set_attribute(&self, local_name: DOMString, value: DOMString,
+    fn do_set_attribute(&self, local_name: DOMString, value: AttrValue,
                         name: DOMString, namespace: Namespace,
                         prefix: Option<DOMString>, cb: |&JSRef<Attr>| -> bool);
+    fn parse_attribute(&self, namespace: &Namespace, local_name: &str,
+                       value: DOMString) -> AttrValue;
 
     fn remove_attribute(&self, namespace: Namespace, name: DOMString) -> ErrorResult;
     fn notify_attribute_changed(&self, local_name: DOMString);
@@ -236,6 +239,7 @@ pub trait AttributeHandlers {
     fn set_url_attribute(&self, name: &str, value: DOMString);
     fn get_string_attribute(&self, name: &str) -> DOMString;
     fn set_string_attribute(&self, name: &str, value: DOMString);
+    fn set_tokenlist_attribute(&self, name: &str, value: DOMString);
     fn set_uint_attribute(&self, name: &str, value: u32);
 }
 
@@ -262,10 +266,11 @@ impl<'a> AttributeHandlers for JSRef<'a, Element> {
             None => local_name.clone(),
             Some(ref prefix) => format!("{:s}:{:s}", *prefix, local_name),
         };
+        let value = self.parse_attribute(&namespace, local_name.as_slice(), value);
         self.do_set_attribute(local_name, value, name, namespace, prefix, |_| false)
     }
 
-    fn set_attribute(&self, name: &str, value: DOMString) {
+    fn set_attribute(&self, name: &str, value: AttrValue) {
         assert!(name == name.to_ascii_lower().as_slice());
         assert!(!name.contains(":"));
 
@@ -277,7 +282,7 @@ impl<'a> AttributeHandlers for JSRef<'a, Element> {
             |attr| attr.deref().local_name.as_slice() == name);
     }
 
-    fn do_set_attribute(&self, local_name: DOMString, value: DOMString,
+    fn do_set_attribute(&self, local_name: DOMString, value: AttrValue,
                         name: DOMString, namespace: Namespace,
                         prefix: Option<DOMString>, cb: |&JSRef<Attr>| -> bool) {
         let idx = self.deref().attrs.borrow().iter()
@@ -297,6 +302,16 @@ impl<'a> AttributeHandlers for JSRef<'a, Element> {
         self.deref().attrs.borrow().get(idx).root().set_value(set_type, value);
     }
 
+    fn parse_attribute(&self, namespace: &Namespace, local_name: &str,
+                       value: DOMString) -> AttrValue {
+        if *namespace == namespace::Null {
+            vtable_for(NodeCast::from_ref(self))
+                .parse_plain_attribute(local_name, value)
+        } else {
+            StringAttrValue(value)
+        }
+    }
+
     fn remove_attribute(&self, namespace: Namespace, name: DOMString) -> ErrorResult {
         let (_, local_name) = get_attribute_parts(name.clone());
 
@@ -362,12 +377,17 @@ impl<'a> AttributeHandlers for JSRef<'a, Element> {
     }
     fn set_string_attribute(&self, name: &str, value: DOMString) {
         assert!(name == name.to_ascii_lower().as_slice());
-        self.set_attribute(name, value);
+        self.set_attribute(name, StringAttrValue(value));
+    }
+
+    fn set_tokenlist_attribute(&self, name: &str, value: DOMString) {
+        assert!(name == name.to_ascii_lower().as_slice());
+        self.set_attribute(name, AttrValue::from_tokenlist(value));
     }
 
     fn set_uint_attribute(&self, name: &str, value: u32) {
         assert!(name == name.to_ascii_lower().as_slice());
-        self.set_attribute(name, value.to_str());
+        self.set_attribute(name, StringAttrValue(value.to_str()));
     }
 }
 
@@ -462,7 +482,7 @@ impl<'a> ElementMethods for JSRef<'a, Element> {
 
     // http://dom.spec.whatwg.org/#dom-element-classname
     fn SetClassName(&self, class: DOMString) {
-        self.set_string_attribute("class", class);
+        self.set_tokenlist_attribute("class", class);
     }
 
     // http://dom.spec.whatwg.org/#dom-element-attributes
@@ -525,6 +545,7 @@ impl<'a> ElementMethods for JSRef<'a, Element> {
         };
 
         // Step 3-5.
+        let value = self.parse_attribute(&namespace::Null, name.as_slice(), value);
         self.do_set_attribute(name.clone(), value, name.clone(), namespace::Null, None, |attr| {
             attr.deref().name == name
         });
@@ -586,6 +607,7 @@ impl<'a> ElementMethods for JSRef<'a, Element> {
         }
 
         // Step 9.
+        let value = self.parse_attribute(&namespace, local_name.as_slice(), value);
         self.do_set_attribute(local_name.clone(), value, name, namespace.clone(), prefix, |attr| {
             attr.deref().local_name == local_name &&
             attr.deref().namespace == namespace
@@ -771,6 +793,13 @@ impl<'a> VirtualMethods for JSRef<'a, Element> {
         self.notify_attribute_changed(name);
     }
 
+    fn parse_plain_attribute(&self, name: &str, value: DOMString) -> AttrValue {
+        match name {
+            "class" => AttrValue::from_tokenlist(value),
+            _ => self.super_type().unwrap().parse_plain_attribute(name, value),
+        }
+    }
+
     fn bind_to_tree(&self) {
         match self.super_type() {
             Some(ref s) => s.bind_to_tree(),

src/components/script/dom/node.rs

@@ -1300,7 +1300,7 @@ impl Node {
                 for attr in node_elem.attrs.borrow().iter().map(|attr| attr.root()) {
                     copy_elem.attrs.borrow_mut().push_unrooted(
                         &Attr::new(&*window,
-                                   attr.deref().local_name.clone(), attr.deref().value_ref().to_string(),
+                                   attr.deref().local_name.clone(), attr.deref().value().clone(),
                                    attr.deref().name.clone(), attr.deref().namespace.clone(),
                                    attr.deref().prefix.clone(), &copy_elem_alias));
                 }

src/components/script/dom/virtualmethods.rs

@@ -2,6 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+use dom::attr::{AttrValue, StringAttrValue};
 use dom::bindings::codegen::InheritTypes::ElementCast;
 use dom::bindings::codegen::InheritTypes::HTMLAnchorElementCast;
 use dom::bindings::codegen::InheritTypes::HTMLBodyElementCast;
@@ -50,6 +51,15 @@ pub trait VirtualMethods {
         }
     }
 
+    /// Returns the right AttrValue variant for the attribute with name `name`
+    /// on this element.
+    fn parse_plain_attribute(&self, name: &str, value: DOMString) -> AttrValue {
+        match self.super_type() {
+            Some(ref s) => s.parse_plain_attribute(name, value),
+            _ => StringAttrValue(value),
+        }
+    }
+
     /// Called when a Node is appended to a tree that is part of a Document.
     fn bind_to_tree(&self) {
         match self.super_type() {