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/* This Source Code Form is subject to the terms of the Mozilla Public
* 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::bindings::codegen::InheritTypes::{ElementCast, NodeCast};
use dom::bindings::codegen::HTMLCollectionBinding;
use dom::bindings::js::JS;
use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
use dom::element::{Element, AttributeHandlers};
use dom::node::{Node, NodeHelpers};
use dom::window::Window;
use servo_util::namespace::Namespace;
use servo_util::str::{DOMString, split_html_space_chars};
use serialize::{Encoder, Encodable};
pub trait CollectionFilter {
fn filter(&self, elem: &JS<Element>, root: &JS<Node>) -> bool;
}
impl<S: Encoder<E>, E> Encodable<S, E> for ~CollectionFilter {
fn encode(&self, _s: &mut S) -> Result<(), E> {
Ok(())
}
}
#[deriving(Encodable)]
pub enum CollectionTypeId {
Static(~[JS<Element>]),
Live(JS<Node>, ~CollectionFilter)
}
#[deriving(Encodable)]
pub struct HTMLCollection {
pub collection: CollectionTypeId,
pub reflector_: Reflector,
pub window: JS<Window>,
}
impl HTMLCollection {
pub fn new_inherited(window: JS<Window>, collection: CollectionTypeId) -> HTMLCollection {
HTMLCollection {
collection: collection,
reflector_: Reflector::new(),
window: window,
}
}
pub fn new(window: &JS<Window>, collection: CollectionTypeId) -> JS<HTMLCollection> {
reflect_dom_object(~HTMLCollection::new_inherited(window.clone(), collection),
window, HTMLCollectionBinding::Wrap)
}
}
impl HTMLCollection {
pub fn create(window: &JS<Window>, root: &JS<Node>, filter: ~CollectionFilter) -> JS<HTMLCollection> {
HTMLCollection::new(window, Live(root.clone(), filter))
}
pub fn by_tag_name(window: &JS<Window>, root: &JS<Node>, tag: DOMString)
-> JS<HTMLCollection> {
struct TagNameFilter {
tag: DOMString
}
impl CollectionFilter for TagNameFilter {
fn filter(&self, elem: &JS<Element>, _root: &JS<Node>) -> bool {
elem.get().local_name == self.tag
}
}
let filter = TagNameFilter {
tag: tag
};
HTMLCollection::create(window, root, ~filter)
}
pub fn by_tag_name_ns(window: &JS<Window>, root: &JS<Node>, tag: DOMString,
namespace: Namespace) -> JS<HTMLCollection> {
struct TagNameNSFilter {
tag: DOMString,
namespace: Namespace
}
impl CollectionFilter for TagNameNSFilter {
fn filter(&self, elem: &JS<Element>, _root: &JS<Node>) -> bool {
elem.get().namespace == self.namespace && elem.get().local_name == self.tag
}
}
let filter = TagNameNSFilter {
tag: tag,
namespace: namespace
};
HTMLCollection::create(window, root, ~filter)
}
pub fn by_class_name(window: &JS<Window>, root: &JS<Node>, classes: DOMString)
-> JS<HTMLCollection> {
struct ClassNameFilter {
classes: ~[DOMString]
}
impl CollectionFilter for ClassNameFilter {
fn filter(&self, elem: &JS<Element>, _root: &JS<Node>) -> bool {
self.classes.iter().all(|class| elem.has_class(*class))
}
}
let filter = ClassNameFilter {
classes: split_html_space_chars(classes).map(|class| class.into_owned()).collect()
};
HTMLCollection::create(window, root, ~filter)
}
pub fn children(window: &JS<Window>, root: &JS<Node>) -> JS<HTMLCollection> {
struct ElementChildFilter;
impl CollectionFilter for ElementChildFilter {
fn filter(&self, elem: &JS<Element>, root: &JS<Node>) -> bool {
root.is_parent_of(&NodeCast::from(elem))
}
}
HTMLCollection::create(window, root, ~ElementChildFilter)
}
}
impl HTMLCollection {
// http://dom.spec.whatwg.org/#dom-htmlcollection-length
pub fn Length(&self) -> u32 {
match self.collection {
Static(ref elems) => elems.len() as u32,
Live(ref root, ref filter) => root.traverse_preorder()
.count(|child| {
let elem: Option<JS<Element>> = ElementCast::to(&child);
elem.map_or(false, |elem| filter.filter(&elem, root))
}) as u32
}
}
// http://dom.spec.whatwg.org/#dom-htmlcollection-item
pub fn Item(&self, index: u32) -> Option<JS<Element>> {
match self.collection {
Static(ref elems) => elems
.get(index as uint)
.map(|elem| elem.clone()),
Live(ref root, ref filter) => root.traverse_preorder()
.filter_map(|node| ElementCast::to(&node))
.filter(|elem| filter.filter(elem, root))
.nth(index as uint).clone()
}
}
// http://dom.spec.whatwg.org/#dom-htmlcollection-nameditem
pub fn NamedItem(&self, key: DOMString) -> Option<JS<Element>> {
// Step 1.
if key.is_empty() {
return None;
}
// Step 2.
match self.collection {
Static(ref elems) => elems.iter()
.find(|elem| {
elem.get_string_attribute("name") == key ||
elem.get_string_attribute("id") == key })
.map(|maybe_elem| maybe_elem.clone()),
Live(ref root, ref filter) => root.traverse_preorder()
.filter_map(|node| ElementCast::to(&node))
.filter(|elem| filter.filter(elem, root))
.find(|elem| {
elem.get_string_attribute("name") == key ||
elem.get_string_attribute("id") == key })
.map(|maybe_elem| maybe_elem.clone())
}
}
}
impl HTMLCollection {
pub fn IndexedGetter(&self, index: u32, found: &mut bool) -> Option<JS<Element>> {
let maybe_elem = self.Item(index);
*found = maybe_elem.is_some();
maybe_elem
}
pub fn NamedGetter(&self, maybe_name: Option<DOMString>, found: &mut bool) -> Option<JS<Element>> {
match maybe_name {
Some(name) => {
let maybe_elem = self.NamedItem(name);
*found = maybe_elem.is_some();
maybe_elem
},
None => {
*found = false;
None
}
}
}
}
impl Reflectable for HTMLCollection {
fn reflector<'a>(&'a self) -> &'a Reflector {
&self.reflector_
}
fn mut_reflector<'a>(&'a mut self) -> &'a mut Reflector {
&mut self.reflector_
}
}
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