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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::callback::ExceptionHandling::Rethrow;
use dom::bindings::codegen::Bindings::NodeIteratorBinding;
use dom::bindings::codegen::Bindings::NodeIteratorBinding::NodeIteratorMethods;
use dom::bindings::codegen::Bindings::NodeBinding::NodeMethods;
use dom::bindings::codegen::Bindings::NodeFilterBinding::NodeFilter;
use dom::bindings::codegen::Bindings::NodeFilterBinding::NodeFilterConstants;
use dom::bindings::error::Fallible;
use dom::bindings::global::GlobalRef;
use dom::bindings::js::{JS, MutHeap, Root};
use dom::bindings::utils::{Reflector, reflect_dom_object};
use dom::document::{Document, DocumentHelpers};
use dom::node::{Node, NodeHelpers};
use std::cell::Cell;
use std::rc::Rc;
#[dom_struct]
pub struct NodeIterator {
reflector_: Reflector,
root_node: JS<Node>,
reference_node: MutHeap<JS<Node>>,
pointer_before_reference_node: Cell<bool>,
what_to_show: u32,
filter: Filter,
}
impl NodeIterator {
fn new_inherited(root_node: &Node,
what_to_show: u32,
filter: Filter) -> NodeIterator {
NodeIterator {
reflector_: Reflector::new(),
root_node: JS::from_ref(root_node),
reference_node: MutHeap::new(JS::from_ref(root_node)),
pointer_before_reference_node: Cell::new(true),
what_to_show: what_to_show,
filter: filter
}
}
pub fn new_with_filter(document: &Document,
root_node: &Node,
what_to_show: u32,
filter: Filter) -> Root<NodeIterator> {
let window = document.window();
reflect_dom_object(box NodeIterator::new_inherited(root_node, what_to_show, filter),
GlobalRef::Window(window.r()),
NodeIteratorBinding::Wrap)
}
pub fn new(document: &Document,
root_node: &Node,
what_to_show: u32,
node_filter: Option<Rc<NodeFilter>>) -> Root<NodeIterator> {
let filter = match node_filter {
None => Filter::None,
Some(jsfilter) => Filter::Callback(jsfilter)
};
NodeIterator::new_with_filter(document, root_node, what_to_show, filter)
}
}
impl<'a> NodeIteratorMethods for &'a NodeIterator {
// https://dom.spec.whatwg.org/#dom-nodeiterator-root
fn Root(self) -> Root<Node> {
self.root_node.root()
}
// https://dom.spec.whatwg.org/#dom-nodeiterator-whattoshow
fn WhatToShow(self) -> u32 {
self.what_to_show
}
// https://dom.spec.whatwg.org/#dom-nodeiterator-filter
fn GetFilter(self) -> Option<Rc<NodeFilter>> {
match self.filter {
Filter::None => None,
Filter::Callback(ref nf) => Some((*nf).clone()),
Filter::Native(_) => panic!("Cannot convert native node filter to DOM NodeFilter")
}
}
// https://dom.spec.whatwg.org/#dom-nodeiterator-referencenode
fn ReferenceNode(self) -> Root<Node> {
self.reference_node.get().root()
}
// https://dom.spec.whatwg.org/#dom-nodeiterator-pointerbeforereferencenode
fn PointerBeforeReferenceNode(self) -> bool {
self.pointer_before_reference_node.get()
}
// https://dom.spec.whatwg.org/#dom-nodeiterator-nextnode
fn NextNode(self) -> Fallible<Option<Root<Node>>> {
// https://dom.spec.whatwg.org/#concept-NodeIterator-traverse
// Step 1.
let node = self.reference_node.get().root();
// Step 2.
let mut before_node = self.pointer_before_reference_node.get();
// Step 3-1.
if before_node {
before_node = false;
// Step 3-2.
let result = try!(self.accept_node(node.r()));
// Step 3-3.
if result == NodeFilterConstants::FILTER_ACCEPT {
// Step 4.
self.reference_node.set(JS::from_ref(node.r()));
self.pointer_before_reference_node.set(before_node);
return Ok(Some(node));
}
}
// Step 3-1.
for following_node in node.r().following_nodes(self.root_node.root().r()) {
// Step 3-2.
let result = try!(self.accept_node(following_node.r()));
// Step 3-3.
if result == NodeFilterConstants::FILTER_ACCEPT {
// Step 4.
self.reference_node.set(JS::from_ref(following_node.r()));
self.pointer_before_reference_node.set(before_node);
return Ok(Some(following_node));
}
}
return Ok(None);
}
// https://dom.spec.whatwg.org/#dom-nodeiterator-previousnode
fn PreviousNode(self) -> Fallible<Option<Root<Node>>> {
// https://dom.spec.whatwg.org/#concept-NodeIterator-traverse
// Step 1.
let node = self.reference_node.get().root();
// Step 2.
let mut before_node = self.pointer_before_reference_node.get();
// Step 3-1.
if !before_node {
before_node = true;
// Step 3-2.
let result = try!(self.accept_node(node.r()));
// Step 3-3.
if result == NodeFilterConstants::FILTER_ACCEPT {
// Step 4.
self.reference_node.set(JS::from_ref(node.r()));
self.pointer_before_reference_node.set(before_node);
return Ok(Some(node));
}
}
// Step 3-1.
for preceding_node in node.r().preceding_nodes(self.root_node.root().r()) {
// Step 3-2.
let result = try!(self.accept_node(preceding_node.r()));
// Step 3-3.
if result == NodeFilterConstants::FILTER_ACCEPT {
// Step 4.
self.reference_node.set(JS::from_ref(preceding_node.r()));
self.pointer_before_reference_node.set(before_node);
return Ok(Some(preceding_node));
}
}
return Ok(None);
}
// https://dom.spec.whatwg.org/#dom-nodeiterator-detach
fn Detach(self) {
// This method intentionally left blank.
}
}
trait PrivateNodeIteratorHelpers {
fn accept_node(self, node: &Node) -> Fallible<u16>;
fn is_root_node(self, node: &Node) -> bool;
}
impl<'a> PrivateNodeIteratorHelpers for &'a NodeIterator {
// https://dom.spec.whatwg.org/#concept-node-filter
fn accept_node(self, node: &Node) -> Fallible<u16> {
// Step 1.
let n = node.NodeType() - 1;
// Step 2.
if (self.what_to_show & (1 << n)) == 0 {
return Ok(NodeFilterConstants::FILTER_SKIP)
}
// Step 3-5.
match self.filter {
Filter::None => Ok(NodeFilterConstants::FILTER_ACCEPT),
Filter::Native(f) => Ok((f)(node)),
Filter::Callback(ref callback) => callback.AcceptNode_(self, node, Rethrow)
}
}
fn is_root_node(self, node: &Node) -> bool {
JS::from_ref(node) == self.root_node
}
}
#[jstraceable]
pub enum Filter {
None,
Native(fn (node: &Node) -> u16),
Callback(Rc<NodeFilter>)
}
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