forked from mirrors/gecko-dev
a8ae8f9091
Source-Repo: https://github.com/servo/servo Source-Revision: f313e8baffe5a41d839c3e0de28e8cd6e7a4773a
260 lines
12 KiB
Rust
260 lines
12 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use dom::attr::Attr;
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use dom::bindings::inheritance::Castable;
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use dom::bindings::inheritance::ElementTypeId;
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use dom::bindings::inheritance::HTMLElementTypeId;
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use dom::bindings::inheritance::NodeTypeId;
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use dom::bindings::inheritance::SVGElementTypeId;
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use dom::bindings::inheritance::SVGGraphicsElementTypeId;
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use dom::bindings::str::DOMString;
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use dom::document::Document;
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use dom::element::{AttributeMutation, Element};
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use dom::event::Event;
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use dom::htmlanchorelement::HTMLAnchorElement;
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use dom::htmlappletelement::HTMLAppletElement;
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use dom::htmlareaelement::HTMLAreaElement;
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use dom::htmlbaseelement::HTMLBaseElement;
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use dom::htmlbodyelement::HTMLBodyElement;
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use dom::htmlbuttonelement::HTMLButtonElement;
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use dom::htmlcanvaselement::HTMLCanvasElement;
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use dom::htmldetailselement::HTMLDetailsElement;
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use dom::htmlelement::HTMLElement;
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use dom::htmlfieldsetelement::HTMLFieldSetElement;
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use dom::htmlfontelement::HTMLFontElement;
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use dom::htmlformelement::HTMLFormElement;
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use dom::htmlheadelement::HTMLHeadElement;
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use dom::htmlhrelement::HTMLHRElement;
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use dom::htmliframeelement::HTMLIFrameElement;
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use dom::htmlimageelement::HTMLImageElement;
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use dom::htmlinputelement::HTMLInputElement;
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use dom::htmllabelelement::HTMLLabelElement;
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use dom::htmllielement::HTMLLIElement;
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use dom::htmllinkelement::HTMLLinkElement;
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use dom::htmlmediaelement::HTMLMediaElement;
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use dom::htmlmetaelement::HTMLMetaElement;
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use dom::htmlobjectelement::HTMLObjectElement;
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use dom::htmloptgroupelement::HTMLOptGroupElement;
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use dom::htmloptionelement::HTMLOptionElement;
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use dom::htmlscriptelement::HTMLScriptElement;
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use dom::htmlselectelement::HTMLSelectElement;
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use dom::htmlstyleelement::HTMLStyleElement;
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use dom::htmltablecellelement::HTMLTableCellElement;
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use dom::htmltableelement::HTMLTableElement;
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use dom::htmltablerowelement::HTMLTableRowElement;
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use dom::htmltablesectionelement::HTMLTableSectionElement;
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use dom::htmltemplateelement::HTMLTemplateElement;
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use dom::htmltextareaelement::HTMLTextAreaElement;
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use dom::htmltitleelement::HTMLTitleElement;
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use dom::node::{ChildrenMutation, CloneChildrenFlag, Node, UnbindContext};
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use dom::svgsvgelement::SVGSVGElement;
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use html5ever_atoms::LocalName;
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use style::attr::AttrValue;
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/// Trait to allow DOM nodes to opt-in to overriding (or adding to) common
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/// behaviours. Replicates the effect of C++ virtual methods.
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pub trait VirtualMethods {
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/// Returns self as the superclass of the implementation for this trait,
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/// if any.
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fn super_type(&self) -> Option<&VirtualMethods>;
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/// Called when attributes of a node are mutated.
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/// https://dom.spec.whatwg.org/#attribute-is-set
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/// https://dom.spec.whatwg.org/#attribute-is-removed
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fn attribute_mutated(&self, attr: &Attr, mutation: AttributeMutation) {
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if let Some(s) = self.super_type() {
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s.attribute_mutated(attr, mutation);
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}
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}
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/// Returns the right AttrValue variant for the attribute with name `name`
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/// on this element.
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fn parse_plain_attribute(&self, name: &LocalName, value: DOMString) -> AttrValue {
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match self.super_type() {
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Some(ref s) => s.parse_plain_attribute(name, value),
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_ => AttrValue::String(value.into()),
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}
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}
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/// Called when a Node is appended to a tree, where 'tree_in_doc' indicates
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/// whether the tree is part of a Document.
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fn bind_to_tree(&self, tree_in_doc: bool) {
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if let Some(ref s) = self.super_type() {
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s.bind_to_tree(tree_in_doc);
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}
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}
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/// Called when a Node is removed from a tree, where 'tree_in_doc'
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/// indicates whether the tree is part of a Document.
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/// Implements removing steps:
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/// https://dom.spec.whatwg.org/#concept-node-remove-ext
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fn unbind_from_tree(&self, context: &UnbindContext) {
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if let Some(ref s) = self.super_type() {
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s.unbind_from_tree(context);
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}
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}
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/// Called on the parent when its children are changed.
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fn children_changed(&self, mutation: &ChildrenMutation) {
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if let Some(ref s) = self.super_type() {
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s.children_changed(mutation);
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}
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}
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/// Called during event dispatch after the bubbling phase completes.
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fn handle_event(&self, event: &Event) {
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if let Some(s) = self.super_type() {
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s.handle_event(event);
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}
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}
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/// https://dom.spec.whatwg.org/#concept-node-adopt-ext
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fn adopting_steps(&self, old_doc: &Document) {
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if let Some(ref s) = self.super_type() {
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s.adopting_steps(old_doc);
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}
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}
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/// https://dom.spec.whatwg.org/#concept-node-clone-ext
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fn cloning_steps(&self, copy: &Node, maybe_doc: Option<&Document>,
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clone_children: CloneChildrenFlag) {
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if let Some(ref s) = self.super_type() {
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s.cloning_steps(copy, maybe_doc, clone_children);
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}
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}
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/// Called on an element when it is popped off the stack of open elements
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/// of a parser.
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fn pop(&self) {
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if let Some(ref s) = self.super_type() {
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s.pop();
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}
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}
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}
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/// Obtain a VirtualMethods instance for a given Node-derived object. Any
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/// method call on the trait object will invoke the corresponding method on the
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/// concrete type, propagating up the parent hierarchy unless otherwise
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/// interrupted.
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pub fn vtable_for(node: &Node) -> &VirtualMethods {
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match node.type_id() {
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLAnchorElement)) => {
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node.downcast::<HTMLAnchorElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLAppletElement)) => {
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node.downcast::<HTMLAppletElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLAreaElement)) => {
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node.downcast::<HTMLAreaElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLBaseElement)) => {
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node.downcast::<HTMLBaseElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLBodyElement)) => {
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node.downcast::<HTMLBodyElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLButtonElement)) => {
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node.downcast::<HTMLButtonElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLCanvasElement)) => {
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node.downcast::<HTMLCanvasElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLDetailsElement)) => {
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node.downcast::<HTMLDetailsElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLFieldSetElement)) => {
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node.downcast::<HTMLFieldSetElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLFontElement)) => {
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node.downcast::<HTMLFontElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLFormElement)) => {
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node.downcast::<HTMLFormElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLHeadElement)) => {
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node.downcast::<HTMLHeadElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLHRElement)) => {
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node.downcast::<HTMLHRElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLImageElement)) => {
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node.downcast::<HTMLImageElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLIFrameElement)) => {
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node.downcast::<HTMLIFrameElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLInputElement)) => {
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node.downcast::<HTMLInputElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLLabelElement)) => {
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node.downcast::<HTMLLabelElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLLIElement)) => {
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node.downcast::<HTMLLIElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLLinkElement)) => {
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node.downcast::<HTMLLinkElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLMediaElement(_))) => {
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node.downcast::<HTMLMediaElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLMetaElement)) => {
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node.downcast::<HTMLMetaElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLObjectElement)) => {
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node.downcast::<HTMLObjectElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLOptGroupElement)) => {
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node.downcast::<HTMLOptGroupElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLOptionElement)) => {
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node.downcast::<HTMLOptionElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLScriptElement)) => {
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node.downcast::<HTMLScriptElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLSelectElement)) => {
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node.downcast::<HTMLSelectElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLStyleElement)) => {
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node.downcast::<HTMLStyleElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLTableElement)) => {
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node.downcast::<HTMLTableElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLTableCellElement(_))) => {
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node.downcast::<HTMLTableCellElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLTableRowElement)) => {
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node.downcast::<HTMLTableRowElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLTableSectionElement)) => {
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node.downcast::<HTMLTableSectionElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLTemplateElement)) => {
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node.downcast::<HTMLTemplateElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLTextAreaElement)) => {
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node.downcast::<HTMLTextAreaElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLTitleElement)) => {
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node.downcast::<HTMLTitleElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::SVGElement(SVGElementTypeId::SVGGraphicsElement(
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SVGGraphicsElementTypeId::SVGSVGElement
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))) => {
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node.downcast::<SVGSVGElement>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(ElementTypeId::Element) => {
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node.downcast::<Element>().unwrap() as &VirtualMethods
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}
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NodeTypeId::Element(_) => {
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node.downcast::<HTMLElement>().unwrap() as &VirtualMethods
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}
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_ => {
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node as &VirtualMethods
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}
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}
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}
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