Introduce abstraction over HTML and XML parsers for parser network listener.

components/script/dom/servoxmlparser.rs

@@ -2,15 +2,26 @@
  * 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::cell::DOMRefCell;
 use dom::bindings::js::{JS, Root};
 use dom::bindings::reflector::Reflector;
 use dom::bindings::trace::JSTraceable;
 use dom::document::Document;
 use dom::node::Node;
+use dom::servohtmlparser::ParserRef;
 use dom::text::Text;
+use dom::window::Window;
+use js::jsapi::JSTracer;
+use msg::constellation_msg::PipelineId;
+use parse::Parser;
+use script_task::ScriptTask;
+use std::cell::Cell;
 use url::Url;
 use util::str::DOMString;
-use xml5ever::tree_builder::{NodeOrText, TreeSink};
+use xml5ever::tokenizer;
+use xml5ever::tree_builder::{self, NodeOrText, XmlTreeBuilder};
+
+pub type Tokenizer = tokenizer::XmlTokenizer<XmlTreeBuilder<JS<Node>, Sink>>;
 
 #[must_root]
 #[derive(JSTraceable, HeapSizeOf)]
@@ -36,9 +47,115 @@ impl Sink {
 #[dom_struct]
 pub struct ServoXMLParser {
     reflector_: Reflector,
+    #[ignore_heap_size_of = "Defined in xml5ever"]
+    tokenizer: DOMRefCell<Tokenizer>,
+    /// Input chunks received but not yet passed to the parser.
+    pending_input: DOMRefCell<Vec<String>>,
+    /// The document associated with this parser.
+    document: JS<Document>,
+    /// True if this parser should avoid passing any further data to the tokenizer.
+    suspended: Cell<bool>,
+    /// Whether to expect any further input from the associated network request.
+    last_chunk_received: Cell<bool>,
+    /// The pipeline associated with this parse, unavailable if this parse does not
+    /// correspond to a page load.
+    pipeline: Option<PipelineId>,
+}
+
+impl<'a> Parser for &'a ServoXMLParser {
+    fn parse_chunk(self, input: String) {
+        self.document.set_current_parser(Some(ParserRef::XML(self)));
+        self.pending_input.borrow_mut().push(input);
+        if !self.is_suspended() {
+            self.parse_sync();
+        }
+    }
+
+    fn finish(self) {
+        assert!(!self.suspended.get());
+        assert!(self.pending_input.borrow().is_empty());
+
+        self.tokenizer.borrow_mut().end();
+        debug!("finished parsing");
+
+        self.document.set_current_parser(None);
+
+        if let Some(pipeline) = self.pipeline {
+            ScriptTask::parsing_complete(pipeline);
+        }
+    }
 }
 
 impl ServoXMLParser {
     pub fn new() {
     }
+
+    pub fn window(&self) -> &Window {
+        self.document.window()
+    }
+
+    pub fn resume(&self) {
+        panic!()
+    }
+
+    pub fn suspend(&self) {
+        panic!()
+    }
+
+    pub fn is_suspended(&self) -> bool {
+        panic!()
+    }
+
+    pub fn parse_sync(&self) {
+        panic!()
+    }
+
+    pub fn pending_input(&self) -> &DOMRefCell<Vec<String>> {
+        &self.pending_input
+    }
+
+    pub fn set_plaintext_state(&self) {
+        //self.tokenizer.borrow_mut().set_plaintext_state()
+    }
+
+    pub fn end_tokenizer(&self) {
+        self.tokenizer.borrow_mut().end()
+    }
+
+    pub fn document(&self) -> &Document {
+        &self.document
+    }
+
+    pub fn last_chunk_received(&self) -> &Cell<bool> {
+        &self.last_chunk_received
+    }
+
+    pub fn tokenizer(&self) -> &DOMRefCell<Tokenizer> {
+        &self.tokenizer
+    }
+}
+
+struct Tracer {
+    trc: *mut JSTracer,
+}
+
+impl tree_builder::Tracer for Tracer {
+    type Handle = JS<Node>;
+    #[allow(unrooted_must_root)]
+    fn trace_handle(&self, node: JS<Node>) {
+        node.trace(self.trc);
+    }
+}
+
+impl JSTraceable for Tokenizer {
+    fn trace(&self, trc: *mut JSTracer) {
+        let tracer = Tracer {
+            trc: trc,
+        };
+        let tracer = &tracer as &tree_builder::Tracer<Handle=JS<Node>>;
+
+        let tree_builder = self.sink();
+        tree_builder.trace_handles(tracer);
+        tree_builder.sink().trace(trc);
+    }
 }