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use webcore::value::{Value, Reference};
use webcore::try_from::TryInto;
use webcore::reference_type::ReferenceType;
use webapi::node::Node;
/// `NodeList` objects are collections of nodes such as those returned by properties
/// such as [INode::child_nodes](trait.INode.html#method.child_nodes) and the
/// [Document::query_selector_all](struct.Document.html#method.query_selector_all) method.
///
/// In some cases, the `NodeList` is a live collection, which means that changes in the DOM
/// are reflected in the collection - for example [INode::child_nodes](trait.INode.html#method.child_nodes) is live.
///
/// In other cases, the `NodeList` is a static collection, meaning any subsequent change
/// in the DOM does not affect the content of the collection - for example
/// [Document::query_selector_all](struct.Document.html#method.query_selector_all) returns
/// a static `NodeList`.
///
/// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/NodeList)
// https://dom.spec.whatwg.org/#nodelist
#[derive(Clone, Debug, PartialEq, Eq, ReferenceType)]
#[reference(instance_of = "NodeList")]
pub struct NodeList( Reference );
impl NodeList {
/// Returns the number of [Node](struct.Node.html)s contained in this list.
///
/// [(JavaScript docs)](https://developer.mozilla.org/en-US/docs/Web/API/NodeList/length)
// https://dom.spec.whatwg.org/#ref-for-dom-nodelist-length
pub fn len( &self ) -> u32 {
js!( return @{self}.length; ).try_into().unwrap()
}
/// Returns an iterator over the list.
pub fn iter( &self ) -> NodeIter {
NodeIter {
list: self.clone(),
index: 0
}
}
}
impl IntoIterator for NodeList {
type Item = Node;
type IntoIter = NodeIter;
#[inline]
fn into_iter( self ) -> Self::IntoIter {
NodeIter {
list: self,
index: 0
}
}
}
impl< 'a > IntoIterator for &'a NodeList {
type Item = Node;
type IntoIter = NodeIter;
#[inline]
fn into_iter( self ) -> Self::IntoIter {
NodeIter {
list: self.clone(),
index: 0
}
}
}
#[derive(Debug)]
pub struct NodeIter {
list: NodeList,
index: i32
}
impl Iterator for NodeIter {
type Item = Node;
fn next( &mut self ) -> Option< Self::Item > {
let value = js!(
return @{&self.list}[ @{self.index} ];
);
let node = match value {
Value::Undefined => return None,
Value::Reference( reference ) => unsafe { Node::from_reference_unchecked( reference ) },
_ => unreachable!()
};
self.index += 1;
Some( node )
}
}