From e3b513b969f8f5753ecbb8460a19df825c748099 Mon Sep 17 00:00:00 2001 From: Chris Paris Date: Fri, 19 Sep 2014 10:54:26 -0400 Subject: [PATCH] servo: Merge #3253 - Implement TreeWalker (from ChrisParis:TreeWalker) Source-Repo: https://github.com/servo/servo Source-Revision: 6d6726178a02836b3089fe0dd13cd67d74fdc276 --- .../script/dom/bindings/codegen/Bindings.conf | 4 + servo/components/script/dom/document.rs | 8 + servo/components/script/dom/treewalker.rs | 559 +++++++++++++++++- .../script/dom/webidls/Document.webidl | 6 + .../script/dom/webidls/TreeWalker.webidl | 33 +- 5 files changed, 592 insertions(+), 18 deletions(-) diff --git a/servo/components/script/dom/bindings/codegen/Bindings.conf b/servo/components/script/dom/bindings/codegen/Bindings.conf index f8119bc71f52..f3a57a23cac0 100644 --- a/servo/components/script/dom/bindings/codegen/Bindings.conf +++ b/servo/components/script/dom/bindings/codegen/Bindings.conf @@ -18,6 +18,10 @@ DOMInterfaces = { 'EventListener': { 'nativeType': 'EventListenerBinding::EventListener', }, +'NodeFilter': { + 'nativeType': 'NodeFilterBinding::NodeFilter', + 'returnType': 'NodeFilterBinding::NodeFilter', +}, 'Window': { 'outerObjectHook': 'Some(bindings::utils::outerize_global)', }, diff --git a/servo/components/script/dom/document.rs b/servo/components/script/dom/document.rs index 5f2661f9e105..177097be7df4 100644 --- a/servo/components/script/dom/document.rs +++ b/servo/components/script/dom/document.rs @@ -7,6 +7,7 @@ use dom::bindings::codegen::Bindings::DocumentBinding; use dom::bindings::codegen::Bindings::DocumentBinding::DocumentMethods; use dom::bindings::codegen::Bindings::EventHandlerBinding::EventHandlerNonNull; use dom::bindings::codegen::Bindings::NodeBinding::NodeMethods; +use dom::bindings::codegen::Bindings::NodeFilterBinding::NodeFilter; use dom::bindings::codegen::Bindings::WindowBinding::WindowMethods; use dom::bindings::codegen::InheritTypes::{DocumentDerived, EventCast, HTMLElementCast}; use dom::bindings::codegen::InheritTypes::{HTMLHeadElementCast, TextCast, ElementCast}; @@ -47,6 +48,7 @@ use dom::nodelist::NodeList; use dom::text::Text; use dom::processinginstruction::ProcessingInstruction; use dom::range::Range; +use dom::treewalker::TreeWalker; use dom::uievent::UIEvent; use dom::window::{Window, WindowHelpers}; use html::hubbub_html_parser::build_element_from_tag; @@ -591,6 +593,12 @@ impl<'a> DocumentMethods for JSRef<'a, Document> { Range::new(self) } + // http://dom.spec.whatwg.org/#dom-document-createtreewalker + fn CreateTreeWalker(&self, root: &JSRef, whatToShow: u32, filter: Option) + -> Temporary { + TreeWalker::new(self, root, whatToShow, filter) + } + // http://www.whatwg.org/specs/web-apps/current-work/#document.title fn Title(&self) -> DOMString { let mut title = String::new(); diff --git a/servo/components/script/dom/treewalker.rs b/servo/components/script/dom/treewalker.rs index 89717cfb64f3..b20dd3ac5683 100644 --- a/servo/components/script/dom/treewalker.rs +++ b/servo/components/script/dom/treewalker.rs @@ -2,31 +2,126 @@ * 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::RethrowExceptions; use dom::bindings::codegen::Bindings::TreeWalkerBinding; use dom::bindings::codegen::Bindings::TreeWalkerBinding::TreeWalkerMethods; -use dom::bindings::global::GlobalRef; -use dom::bindings::js::{JSRef, Temporary}; +use dom::bindings::codegen::Bindings::NodeBinding::NodeMethods; +use dom::bindings::codegen::Bindings::NodeFilterBinding::NodeFilter; +// FIXME: Uncomment when codegen fix allows NodeFilterConstants +// to move to the NodeFilter binding file (#3149). +// For now, it is defined in this file. +// use dom::bindings::codegen::Bindings::NodeFilterBinding::NodeFilterConstants; +use dom::bindings::error::{ErrorResult, Fallible}; +use dom::bindings::global::Window; +use dom::bindings::js::{JS, JSRef, OptionalRootable, Temporary}; +use dom::bindings::trace::Untraceable; use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object}; +use dom::document::Document; +use dom::node::{Node, NodeHelpers}; +use serialize::{Encoder, Encodable}; +use std::cell::Cell; + +// http://dom.spec.whatwg.org/#interface-treewalker #[deriving(Encodable)] #[must_root] pub struct TreeWalker { - pub reflector_: Reflector + pub reflector_: Reflector, + pub root_node: JS, + pub current_node: Cell>, + pub what_to_show: u32, + pub filter: Filter } impl TreeWalker { - pub fn new_inherited() -> TreeWalker { + pub fn new_inherited(root_node: &JSRef, + what_to_show: u32, + filter: Filter) -> TreeWalker { TreeWalker { - reflector_: Reflector::new() + reflector_: Reflector::new(), + root_node: JS::from_rooted(root_node), + current_node: Cell::new(JS::from_rooted(root_node)), + what_to_show: what_to_show, + filter: filter } } - pub fn new(global: &GlobalRef) -> Temporary { - reflect_dom_object(box TreeWalker::new_inherited(), global, TreeWalkerBinding::Wrap) + pub fn new_with_filter(document: &JSRef, + root_node: &JSRef, + what_to_show: u32, + filter: Filter) -> Temporary { + let window = document.window.root(); + reflect_dom_object(box TreeWalker::new_inherited(root_node, what_to_show, filter), + &Window(*window), + TreeWalkerBinding::Wrap) + } + + pub fn new(document: &JSRef, + root_node: &JSRef, + what_to_show: u32, + node_filter: Option) -> Temporary { + let filter = match node_filter { + None => FilterNone, + Some(jsfilter) => FilterJS(jsfilter) + }; + TreeWalker::new_with_filter(document, root_node, what_to_show, filter) } } impl<'a> TreeWalkerMethods for JSRef<'a, TreeWalker> { + fn Root(&self) -> Temporary { + Temporary::new(self.root_node) + } + + fn WhatToShow(&self) -> u32 { + self.what_to_show + } + + fn GetFilter(&self) -> Option { + match self.filter { + FilterNone => None, + FilterJS(nf) => Some(nf), + FilterNative(_) => fail!("Cannot convert native node filter to DOM NodeFilter") + } + } + + fn CurrentNode(&self) -> Temporary { + Temporary::new(self.current_node.get()) + } + + fn SetCurrentNode(&self, node: &JSRef) -> ErrorResult { + // XXX Future: check_same_origin(root_node, node) (throws) + self.current_node.set(JS::from_rooted(node)); + Ok(()) + } + + fn ParentNode(&self) -> Fallible>> { + self.parent_node() + } + + fn FirstChild(&self) -> Fallible>> { + self.first_child() + } + + fn LastChild(&self) -> Fallible>> { + self.last_child() + } + + fn PreviousSibling(&self) -> Fallible>> { + self.prev_sibling() + } + + fn NextSibling(&self) -> Fallible>> { + self.next_sibling() + } + + fn PreviousNode(&self) -> Fallible>> { + self.prev_node() + } + + fn NextNode(&self) -> Fallible>> { + self.next_node() + } } impl Reflectable for TreeWalker { @@ -34,3 +129,453 @@ impl Reflectable for TreeWalker { &self.reflector_ } } + +type NodeAdvancer<'a, 'b> = |node: &JSRef<'a, Node>|: 'b -> Option>; + +trait PrivateTreeWalkerHelpers<'a, 'b> { + fn traverse_children(&self, + next_child: NodeAdvancer<'a, 'b>, + next_sibling: NodeAdvancer<'a, 'b>) + -> Fallible>>; + fn traverse_siblings(&self, + next_child: NodeAdvancer<'a, 'b>, + next_sibling: NodeAdvancer<'a, 'b>) + -> Fallible>>; + fn is_root_node(&self, node: &JSRef<'a, Node>) -> bool; + fn is_current_node(&self, node: &JSRef<'a, Node>) -> bool; + fn first_following_node_not_following_root(&self, node: &JSRef<'a, Node>) + -> Option>; + fn accept_node(&self, node: &JSRef<'a, Node>) -> Fallible; +} + +impl<'a, 'b> PrivateTreeWalkerHelpers<'a, 'b> for JSRef<'a, TreeWalker> { + // http://dom.spec.whatwg.org/#concept-traverse-children + fn traverse_children(&self, + next_child: NodeAdvancer<'a, 'b>, + next_sibling: NodeAdvancer<'a, 'b>) + -> Fallible>> { + // "To **traverse children** of type *type*, run these steps:" + // "1. Let node be the value of the currentNode attribute." + // "2. Set node to node's first child if type is first, and node's last child if type is last." + let cur = self.current_node.get().root(); + let mut node_op: Option> = next_child(&*cur).map(|node| node.root().clone()); + + // 3. Main: While node is not null, run these substeps: + 'main: loop { + match node_op { + None => break, + Some(node) => { + // "1. Filter node and let result be the return value." + match self.accept_node(&node) { + Err(e) => return Err(e), + // "2. If result is FILTER_ACCEPT, then set the currentNode + // attribute to node and return node." + Ok(NodeFilterConstants::FILTER_ACCEPT) => { + self.current_node.set(JS::from_rooted(&node)); + return Ok(Some(Temporary::from_rooted(&node))) + }, + // "3. If result is FILTER_SKIP, run these subsubsteps:" + Ok(NodeFilterConstants::FILTER_SKIP) => { + // "1. Let child be node's first child if type is first, + // and node's last child if type is last." + match next_child(&node) { + // "2. If child is not null, set node to child and goto Main." + Some(child) => { + node_op = Some(child.root().clone()); + continue 'main + }, + None => {} + } + }, + _ => {} + } + // "4. While node is not null, run these substeps:" + loop { + match node_op { + None => break, + Some(node) => { + // "1. Let sibling be node's next sibling if type is next, + // and node's previous sibling if type is previous." + match next_sibling(&node) { + // "2. If sibling is not null, + // set node to sibling and goto Main." + Some(sibling) => { + node_op = Some(sibling.root().clone()); + continue 'main + }, + None => { + // "3. Let parent be node's parent." + match node.parent_node().map(|p| p.root().clone()) { + // "4. If parent is null, parent is root, + // or parent is currentNode attribute's value, + // return null." + None => return Ok(None), + Some(parent) if self.is_root_node(&parent) + || self.is_current_node(&parent) => + return Ok(None), + // "5. Otherwise, set node to parent." + Some(parent) => node_op = Some(parent) + } + } + } + } + } + } + } + } + } + // "4. Return null." + Ok(None) + } + + // http://dom.spec.whatwg.org/#concept-traverse-siblings + fn traverse_siblings(&self, + next_child: NodeAdvancer<'a, 'b>, + next_sibling: NodeAdvancer<'a, 'b>) + -> Fallible>> { + // "To **traverse siblings** of type *type* run these steps:" + // "1. Let node be the value of the currentNode attribute." + let mut node = self.current_node.get().root().clone(); + // "2. If node is root, return null." + if self.is_root_node(&node) { + return Ok(None) + } + // "3. Run these substeps:" + loop { + // "1. Let sibling be node's next sibling if type is next, + // and node's previous sibling if type is previous." + let mut sibling_op = next_sibling(&node); + // "2. While sibling is not null, run these subsubsteps:" + while sibling_op.is_some() { + // "1. Set node to sibling." + node = sibling_op.unwrap().root().clone(); + // "2. Filter node and let result be the return value." + let result = self.accept_node(&node); + // "3. If result is FILTER_ACCEPT, then set the currentNode + // attribute to node and return node." + match result { + Err(e) => return Err(e), + Ok(NodeFilterConstants::FILTER_ACCEPT) => { + self.current_node.set(JS::from_rooted(&node)); + return Ok(Some(Temporary::from_rooted(&node))) + }, + _ => {} + } + // "4. Set sibling to node's first child if type is next, + // and node's last child if type is previous." + sibling_op = next_child(&node); + // "5. If result is FILTER_REJECT or sibling is null, + // then set sibling to node's next sibling if type is next, + // and node's previous sibling if type is previous." + match (result, sibling_op) { + (Ok(NodeFilterConstants::FILTER_REJECT), _) + | (_, None) => sibling_op = next_sibling(&node), + _ => {} + } + } + // "3. Set node to its parent." + match node.parent_node().map(|p| p.root().clone()) { + // "4. If node is null or is root, return null." + None => return Ok(None), + Some(n) if self.is_root_node(&n) => return Ok(None), + // "5. Filter node and if the return value is FILTER_ACCEPT, then return null." + Some(n) => { + node = n; + match self.accept_node(&node) { + Err(e) => return Err(e), + Ok(NodeFilterConstants::FILTER_ACCEPT) => return Ok(None), + _ => {} + } + } + } + // "6. Run these substeps again." + } + } + + // http://dom.spec.whatwg.org/#concept-tree-following + fn first_following_node_not_following_root(&self, node: &JSRef<'a, Node>) + -> Option> { + // "An object A is following an object B if A and B are in the same tree + // and A comes after B in tree order." + match node.next_sibling() { + None => { + let mut candidate = *node; + while !self.is_root_node(&candidate) && candidate.next_sibling().is_none() { + match candidate.parent_node() { + None => + // This can happen if the user set the current node to somewhere + // outside of the tree rooted at the original root. + return None, + Some(n) => candidate = n.root().clone() + } + } + if self.is_root_node(&candidate) { + None + } else { + candidate.next_sibling() + } + }, + it => it + } + } + + // http://dom.spec.whatwg.org/#concept-node-filter + fn accept_node(&self, node: &JSRef<'a, Node>) -> Fallible { + // "To filter node run these steps:" + // "1. Let n be node's nodeType attribute value minus 1." + let n: uint = node.NodeType() as uint - 1; + // "2. If the nth bit (where 0 is the least significant bit) of whatToShow is not set, + // return FILTER_SKIP." + if (self.what_to_show & (1 << n)) == 0 { + return Ok(NodeFilterConstants::FILTER_SKIP) + } + // "3. If filter is null, return FILTER_ACCEPT." + // "4. Let result be the return value of invoking filter." + // "5. If an exception was thrown, re-throw the exception." + // "6. Return result." + match self.filter { + FilterNone => Ok(NodeFilterConstants::FILTER_ACCEPT), + FilterNative(f) => Ok((*f)(node)), + FilterJS(callback) => callback.AcceptNode_(self, node, RethrowExceptions) + } + } + + fn is_root_node(&self, node: &JSRef<'a, Node>) -> bool { + JS::from_rooted(node) == self.root_node + } + + fn is_current_node(&self, node: &JSRef<'a, Node>) -> bool { + JS::from_rooted(node) == self.current_node.get() + } +} + +pub trait TreeWalkerHelpers<'a> { + fn parent_node(&self) -> Fallible>>; + fn first_child(&self) -> Fallible>>; + fn last_child(&self) -> Fallible>>; + fn next_sibling(&self) -> Fallible>>; + fn prev_sibling(&self) -> Fallible>>; + fn next_node(&self) -> Fallible>>; + fn prev_node(&self) -> Fallible>>; +} + +impl<'a> TreeWalkerHelpers<'a> for JSRef<'a, TreeWalker> { + // http://dom.spec.whatwg.org/#dom-treewalker-parentnode + fn parent_node(&self) -> Fallible>> { + // "1. Let node be the value of the currentNode attribute." + let mut node = self.current_node.get().root().clone(); + // "2. While node is not null and is not root, run these substeps:" + while !self.is_root_node(&node) { + // "1. Let node be node's parent." + match node.parent_node() { + Some(n) => { + node = n.root().clone(); + // "2. If node is not null and filtering node returns FILTER_ACCEPT, + // then set the currentNode attribute to node, return node." + match self.accept_node(&node) { + Err(e) => return Err(e), + Ok(NodeFilterConstants::FILTER_ACCEPT) => { + self.current_node.set(JS::from_rooted(&node)); + return Ok(Some(Temporary::from_rooted(&node))) + }, + _ => {} + } + }, + None => break, + } + } + // "3. Return null." + Ok(None) + } + + // http://dom.spec.whatwg.org/#dom-treewalker-firstchild + fn first_child(&self) -> Fallible>> { + // "The firstChild() method must traverse children of type first." + self.traverse_children(|node| node.first_child(), + |node| node.next_sibling()) + } + + // http://dom.spec.whatwg.org/#dom-treewalker-lastchild + fn last_child(&self) -> Fallible>> { + // "The lastChild() method must traverse children of type last." + self.traverse_children(|node| node.last_child(), + |node| node.prev_sibling()) + } + + // http://dom.spec.whatwg.org/#dom-treewalker-nextsibling + fn next_sibling(&self) -> Fallible>> { + // "The nextSibling() method must traverse siblings of type next." + self.traverse_siblings(|node| node.first_child(), + |node| node.next_sibling()) + } + + // http://dom.spec.whatwg.org/#dom-treewalker-previoussibling + fn prev_sibling(&self) -> Fallible>> { + // "The previousSibling() method must traverse siblings of type previous." + self.traverse_siblings(|node| node.last_child(), + |node| node.prev_sibling()) + } + + // http://dom.spec.whatwg.org/#dom-treewalker-previousnode + fn prev_node(&self) -> Fallible>> { + // "1. Let node be the value of the currentNode attribute." + let mut node = self.current_node.get().root().clone(); + // "2. While node is not root, run these substeps:" + while !self.is_root_node(&node) { + // "1. Let sibling be the previous sibling of node." + let mut sibling_op = node.prev_sibling(); + // "2. While sibling is not null, run these subsubsteps:" + while sibling_op.is_some() { + // "1. Set node to sibling." + node = sibling_op.unwrap().root().clone(); + // "2. Filter node and let result be the return value." + // "3. While result is not FILTER_REJECT and node has a child, + // set node to its last child and then filter node and + // set result to the return value." + // "4. If result is FILTER_ACCEPT, then + // set the currentNode attribute to node and return node." + loop { + match self.accept_node(&node) { + Err(e) => return Err(e), + Ok(NodeFilterConstants::FILTER_REJECT) => break, + _ if node.first_child().is_some() => + node = node.last_child().unwrap().root().clone(), + Ok(NodeFilterConstants::FILTER_ACCEPT) => { + self.current_node.set(JS::from_rooted(&node)); + return Ok(Some(Temporary::from_rooted(&node))) + }, + _ => break + } + } + // "5. Set sibling to the previous sibling of node." + sibling_op = node.prev_sibling() + } + // "3. If node is root or node's parent is null, return null." + if self.is_root_node(&node) || node.parent_node() == None { + return Ok(None) + } + // "4. Set node to its parent." + match node.parent_node() { + None => + // This can happen if the user set the current node to somewhere + // outside of the tree rooted at the original root. + return Ok(None), + Some(n) => node = n.root().clone() + } + // "5. Filter node and if the return value is FILTER_ACCEPT, then + // set the currentNode attribute to node and return node." + match self.accept_node(&node) { + Err(e) => return Err(e), + Ok(NodeFilterConstants::FILTER_ACCEPT) => { + self.current_node.set(JS::from_rooted(&node)); + return Ok(Some(Temporary::from_rooted(&node))) + }, + _ => {} + } + } + // "6. Return null." + Ok(None) + } + + // http://dom.spec.whatwg.org/#dom-treewalker-nextnode + fn next_node(&self) -> Fallible>> { + // "1. Let node be the value of the currentNode attribute." + let mut node = self.current_node.get().root().clone(); + // "2. Let result be FILTER_ACCEPT." + let mut result = Ok(NodeFilterConstants::FILTER_ACCEPT); + // "3. Run these substeps:" + loop { + // "1. While result is not FILTER_REJECT and node has a child, run these subsubsteps:" + loop { + match result { + Ok(NodeFilterConstants::FILTER_REJECT) => break, + _ => {} + } + match node.first_child() { + None => break, + Some (child) => { + // "1. Set node to its first child." + node = child.root().clone(); + // "2. Filter node and set result to the return value." + result = self.accept_node(&node); + // "3. If result is FILTER_ACCEPT, then + // set the currentNode attribute to node and return node." + match result { + Err(e) => return Err(e), + Ok(NodeFilterConstants::FILTER_ACCEPT) => { + self.current_node.set(JS::from_rooted(&node)); + return Ok(Some(Temporary::from_rooted(&node))) + }, + _ => {} + } + } + } + } + // "2. If a node is following node and is not following root, + // set node to the first such node." + // "Otherwise, return null." + match self.first_following_node_not_following_root(&node) { + None => return Ok(None), + Some(n) => { + node = n.root().clone(); + // "3. Filter node and set result to the return value." + result = self.accept_node(&node); + // "4. If result is FILTER_ACCEPT, then + // set the currentNode attribute to node and return node." + match result { + Err(e) => return Err(e), + Ok(NodeFilterConstants::FILTER_ACCEPT) => { + self.current_node.set(JS::from_rooted(&node)); + return Ok(Some(Temporary::from_rooted(&node))) + }, + _ => {} + } + } + } + // "5. Run these substeps again." + } + } +} + +impl<'a> Iterator> for JSRef<'a, TreeWalker> { + fn next(&mut self) -> Option> { + match self.next_node() { + Ok(node) => node.map(|n| n.root().clone()), + Err(_) => + // The Err path happens only when a JavaScript + // NodeFilter throws an exception. This iterator + // is meant for internal use from Rust code, which + // will probably be using a native Rust filter, + // which cannot produce an Err result. + unreachable!() + } + } +} + +#[deriving(Encodable)] +pub enum Filter { + FilterNone, + FilterNative(Untraceable) -> u16>), + FilterJS(NodeFilter) +} + +// FIXME: NodeFilterConstants will be defined in NodeFilterBindings.rs +// when codegen supports a callback interface with constants (#3149). +pub mod NodeFilterConstants { + pub static FILTER_ACCEPT: u16 = 1; + pub static FILTER_REJECT: u16 = 2; + pub static FILTER_SKIP: u16 = 3; + pub static SHOW_ALL: u32 = 4294967295; + pub static SHOW_ELEMENT: u32 = 1; + pub static SHOW_ATTRIBUTE: u32 = 2; + pub static SHOW_TEXT: u32 = 4; + pub static SHOW_CDATA_SECTION: u32 = 8; + pub static SHOW_ENTITY_REFERENCE: u32 = 16; + pub static SHOW_ENTITY: u32 = 32; + pub static SHOW_PROCESSING_INSTRUCTION: u32 = 64; + pub static SHOW_COMMENT: u32 = 128; + pub static SHOW_DOCUMENT: u32 = 256; + pub static SHOW_DOCUMENT_TYPE: u32 = 512; + pub static SHOW_DOCUMENT_FRAGMENT: u32 = 1024; + pub static SHOW_NOTATION: u32 = 2048; +} // mod NodeFilterConstants diff --git a/servo/components/script/dom/webidls/Document.webidl b/servo/components/script/dom/webidls/Document.webidl index 0599ba71f95b..ec1d2d0c2934 100644 --- a/servo/components/script/dom/webidls/Document.webidl +++ b/servo/components/script/dom/webidls/Document.webidl @@ -45,6 +45,12 @@ interface Document : Node { Event createEvent(DOMString interface_); Range createRange(); + + // NodeFilter.SHOW_ALL = 0xFFFFFFFF + // [NewObject] + // NodeIterator createNodeIterator(Node root, optional unsigned long whatToShow = 0xFFFFFFFF, optional NodeFilter? filter = null); + [NewObject] + TreeWalker createTreeWalker(Node root, optional unsigned long whatToShow = 0xFFFFFFFF, optional NodeFilter? filter = null); }; /* http://www.whatwg.org/specs/web-apps/current-work/#the-document-object */ diff --git a/servo/components/script/dom/webidls/TreeWalker.webidl b/servo/components/script/dom/webidls/TreeWalker.webidl index 70987abb528b..d879678f6154 100644 --- a/servo/components/script/dom/webidls/TreeWalker.webidl +++ b/servo/components/script/dom/webidls/TreeWalker.webidl @@ -8,16 +8,27 @@ */ interface TreeWalker { - // [SameObject] readonly attribute Node root; - // readonly attribute unsigned long whatToShow; - // readonly attribute NodeFilter? filter; - // attribute Node currentNode; + [SameObject,Constant] + readonly attribute Node root; + [Constant] + readonly attribute unsigned long whatToShow; + [Constant] + readonly attribute NodeFilter? filter; + [Pure, SetterThrows] + attribute Node currentNode; - // Node? parentNode(); - // Node? firstChild(); - // Node? lastChild(); - // Node? previousSibling(); - // Node? nextSibling(); - // Node? previousNode(); - // Node? nextNode(); + [Throws] + Node? parentNode(); + [Throws] + Node? firstChild(); + [Throws] + Node? lastChild(); + [Throws] + Node? previousSibling(); + [Throws] + Node? nextSibling(); + [Throws] + Node? previousNode(); + [Throws] + Node? nextNode(); };