mirror of
https://github.com/servo/servo.git
synced 2025-06-06 16:45:39 +00:00
286 lines
11 KiB
Rust
286 lines
11 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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#![allow(unrooted_must_root)]
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use document_loader::DocumentLoader;
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use dom::bindings::codegen::Bindings::DocumentBinding::DocumentMethods;
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use dom::bindings::codegen::Bindings::HTMLTemplateElementBinding::HTMLTemplateElementMethods;
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use dom::bindings::codegen::Bindings::NodeBinding::NodeMethods;
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use dom::bindings::inheritance::{Castable, CharacterDataTypeId, NodeTypeId};
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use dom::bindings::js::{JS, RootedReference};
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use dom::characterdata::CharacterData;
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use dom::comment::Comment;
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use dom::document::Document;
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use dom::document::{DocumentSource, IsHTMLDocument};
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use dom::documenttype::DocumentType;
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use dom::element::{Element, ElementCreator};
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use dom::htmlformelement::HTMLFormElement;
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use dom::htmlscriptelement::HTMLScriptElement;
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use dom::htmltemplateelement::HTMLTemplateElement;
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use dom::node::Node;
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use dom::node::{document_from_node, window_from_node};
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use dom::processinginstruction::ProcessingInstruction;
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use dom::servohtmlparser;
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use dom::servohtmlparser::{FragmentContext, ServoHTMLParser};
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use encoding::types::Encoding;
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use html5ever::Attribute;
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use html5ever::serialize::TraversalScope;
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use html5ever::serialize::TraversalScope::{ChildrenOnly, IncludeNode};
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use html5ever::serialize::{AttrRef, Serializable, Serializer};
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use html5ever::tree_builder::{NextParserState, NodeOrText, QuirksMode, TreeSink};
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use msg::constellation_msg::PipelineId;
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use parse::Parser;
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use std::borrow::Cow;
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use std::io::{self, Write};
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use string_cache::QualName;
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use tendril::StrTendril;
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use url::Url;
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use util::str::DOMString;
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impl<'a> TreeSink for servohtmlparser::Sink {
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type Handle = JS<Node>;
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fn get_document(&mut self) -> JS<Node> {
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JS::from_ref(self.document.upcast())
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}
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fn get_template_contents(&self, target: JS<Node>) -> JS<Node> {
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let template = target.downcast::<HTMLTemplateElement>()
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.expect("tried to get template contents of non-HTMLTemplateElement in HTML parsing");
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JS::from_ref(template.Content().upcast())
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}
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fn same_node(&self, x: JS<Node>, y: JS<Node>) -> bool {
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x == y
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}
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fn elem_name(&self, target: JS<Node>) -> QualName {
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let elem = target.downcast::<Element>()
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.expect("tried to get name of non-Element in HTML parsing");
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QualName {
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ns: elem.namespace().clone(),
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local: elem.local_name().clone(),
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}
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}
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fn create_element(&mut self, name: QualName, attrs: Vec<Attribute>)
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-> JS<Node> {
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let elem = Element::create(name, None, &*self.document,
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ElementCreator::ParserCreated);
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for attr in attrs {
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elem.set_attribute_from_parser(attr.name, attr.value.into(), None);
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}
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JS::from_ref(elem.upcast())
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}
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fn create_comment(&mut self, text: StrTendril) -> JS<Node> {
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let comment = Comment::new(text.into(), &*self.document);
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JS::from_ref(comment.upcast())
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}
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fn append_before_sibling(&mut self,
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sibling: JS<Node>,
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new_node: NodeOrText<JS<Node>>) -> Result<(), NodeOrText<JS<Node>>> {
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// If there is no parent, return the node to the parser.
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let parent = match sibling.GetParentNode() {
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Some(p) => p,
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None => return Err(new_node),
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};
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let child = self.get_or_create(new_node);
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assert!(parent.InsertBefore(child.r(), Some(&*sibling)).is_ok());
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Ok(())
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}
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fn parse_error(&mut self, msg: Cow<'static, str>) {
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debug!("Parse error: {}", msg);
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}
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fn set_quirks_mode(&mut self, mode: QuirksMode) {
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self.document.set_quirks_mode(mode);
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}
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fn append(&mut self, parent: JS<Node>, child: NodeOrText<JS<Node>>) {
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let child = self.get_or_create(child);
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// FIXME(#3701): Use a simpler algorithm and merge adjacent text nodes
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assert!(parent.AppendChild(child.r()).is_ok());
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}
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fn append_doctype_to_document(&mut self, name: StrTendril, public_id: StrTendril,
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system_id: StrTendril) {
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let doc = &*self.document;
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let doctype = DocumentType::new(
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name.into(), Some(public_id.into()), Some(system_id.into()), doc);
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doc.upcast::<Node>().AppendChild(doctype.upcast()).expect("Appending failed");
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}
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fn add_attrs_if_missing(&mut self, target: JS<Node>, attrs: Vec<Attribute>) {
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let elem = target.downcast::<Element>()
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.expect("tried to set attrs on non-Element in HTML parsing");
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for attr in attrs {
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elem.set_attribute_from_parser(attr.name, attr.value.into(), None);
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}
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}
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fn remove_from_parent(&mut self, target: JS<Node>) {
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if let Some(ref parent) = target.GetParentNode() {
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parent.RemoveChild(&*target).unwrap();
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}
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}
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fn mark_script_already_started(&mut self, node: JS<Node>) {
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let script = node.downcast::<HTMLScriptElement>();
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script.map(|script| script.mark_already_started());
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}
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fn complete_script(&mut self, node: JS<Node>) -> NextParserState {
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let script = node.downcast::<HTMLScriptElement>();
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if let Some(script) = script {
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return script.prepare();
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}
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NextParserState::Continue
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}
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fn reparent_children(&mut self, node: JS<Node>, new_parent: JS<Node>) {
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while let Some(ref child) = node.GetFirstChild() {
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new_parent.AppendChild(child.r()).unwrap();
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}
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}
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}
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impl<'a> Serializable for &'a Node {
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fn serialize<'wr, Wr: Write>(&self, serializer: &mut Serializer<'wr, Wr>,
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traversal_scope: TraversalScope) -> io::Result<()> {
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let node = *self;
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match (traversal_scope, node.type_id()) {
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(_, NodeTypeId::Element(..)) => {
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let elem = node.downcast::<Element>().unwrap();
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let name = QualName::new(elem.namespace().clone(),
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elem.local_name().clone());
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if traversal_scope == IncludeNode {
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let attrs = elem.attrs().iter().map(|attr| {
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let qname = QualName::new(attr.namespace().clone(),
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attr.local_name().clone());
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let value = attr.value().clone();
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(qname, value)
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}).collect::<Vec<_>>();
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let attr_refs = attrs.iter().map(|&(ref qname, ref value)| {
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let ar: AttrRef = (&qname, &**value);
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ar
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});
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try!(serializer.start_elem(name.clone(), attr_refs));
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}
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let children = if let Some(tpl) = node.downcast::<HTMLTemplateElement>() {
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// https://github.com/w3c/DOM-Parsing/issues/1
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tpl.Content().upcast::<Node>().children()
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} else {
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node.children()
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};
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for handle in children {
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try!(handle.r().serialize(serializer, IncludeNode));
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}
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if traversal_scope == IncludeNode {
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try!(serializer.end_elem(name.clone()));
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}
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Ok(())
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},
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(ChildrenOnly, NodeTypeId::Document) => {
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for handle in node.children() {
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try!(handle.r().serialize(serializer, IncludeNode));
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}
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Ok(())
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},
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(ChildrenOnly, _) => Ok(()),
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(IncludeNode, NodeTypeId::DocumentType) => {
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let doctype = node.downcast::<DocumentType>().unwrap();
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serializer.write_doctype(&doctype.name())
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},
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(IncludeNode, NodeTypeId::CharacterData(CharacterDataTypeId::Text)) => {
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let cdata = node.downcast::<CharacterData>().unwrap();
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serializer.write_text(&cdata.data())
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},
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(IncludeNode, NodeTypeId::CharacterData(CharacterDataTypeId::Comment)) => {
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let cdata = node.downcast::<CharacterData>().unwrap();
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serializer.write_comment(&cdata.data())
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},
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(IncludeNode, NodeTypeId::CharacterData(CharacterDataTypeId::ProcessingInstruction)) => {
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let pi = node.downcast::<ProcessingInstruction>().unwrap();
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let data = pi.upcast::<CharacterData>().data();
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serializer.write_processing_instruction(&pi.target(), &data)
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},
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(IncludeNode, NodeTypeId::DocumentFragment) => Ok(()),
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(IncludeNode, NodeTypeId::Document) => panic!("Can't serialize Document node itself"),
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}
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}
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}
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pub enum ParseContext<'a> {
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Fragment(FragmentContext<'a>),
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Owner(Option<PipelineId>),
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}
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pub fn parse_html(document: &Document,
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input: String,
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url: Url,
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context: ParseContext) {
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let parser = match context {
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ParseContext::Owner(owner) =>
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ServoHTMLParser::new(Some(url), document, owner),
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ParseContext::Fragment(fc) =>
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ServoHTMLParser::new_for_fragment(Some(url), document, fc),
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};
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parser.parse_chunk(input.into());
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}
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// https://html.spec.whatwg.org/multipage/#parsing-html-fragments
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pub fn parse_html_fragment(context_node: &Node,
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input: DOMString,
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output: &Node) {
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let window = window_from_node(context_node);
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let context_document = document_from_node(context_node);
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let context_document = context_document.r();
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let url = context_document.url();
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// Step 1.
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let loader = DocumentLoader::new(&*context_document.loader());
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let document = Document::new(window.r(), Some(url.clone()),
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IsHTMLDocument::HTMLDocument,
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None, None,
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DocumentSource::FromParser,
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loader);
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// Step 2.
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document.set_quirks_mode(context_document.quirks_mode());
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// Step 11.
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let form = context_node.inclusive_ancestors()
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.find(|element| element.is::<HTMLFormElement>());
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let fragment_context = FragmentContext {
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context_elem: context_node,
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form_elem: form.r(),
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};
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parse_html(document.r(), input, url.clone(), ParseContext::Fragment(fragment_context));
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// Step 14.
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let root_element = document.GetDocumentElement().expect("no document element");
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for child in root_element.upcast::<Node>().children() {
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output.AppendChild(child.r()).unwrap();
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}
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}
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