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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::cell::DOMRefCell;
use dom::bindings::codegen::Bindings::ServoXMLParserBinding;
use dom::bindings::js::{JS, Root};
use dom::bindings::reflector::{Reflector, reflect_dom_object};
use dom::bindings::trace::JSTraceable;
use dom::document::Document;
use dom::node::Node;
use dom::window::Window;
use js::jsapi::JSTracer;
use msg::constellation_msg::PipelineId;
use parse::{Parser, ParserRef};
use script_thread::ScriptThread;
use std::cell::Cell;
use url::Url;
use xml5ever::tokenizer;
use xml5ever::tree_builder::{self, XmlTreeBuilder};
pub type Tokenizer = tokenizer::XmlTokenizer<XmlTreeBuilder<JS<Node>, Sink>>;
#[must_root]
#[derive(JSTraceable, HeapSizeOf)]
pub struct Sink {
pub base_url: Option<Url>,
pub document: JS<Document>,
}
#[must_root]
#[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 {
ScriptThread::parsing_complete(pipeline);
}
}
}
impl ServoXMLParser {
#[allow(unrooted_must_root)]
pub fn new(base_url: Option<Url>, document: &Document, pipeline: Option<PipelineId>)
-> Root<ServoXMLParser> {
let sink = Sink {
base_url: base_url,
document: JS::from_ref(document),
};
let tb = XmlTreeBuilder::new(sink);
let tok = tokenizer::XmlTokenizer::new(tb, Default::default());
let parser = ServoXMLParser {
reflector_: Reflector::new(),
tokenizer: DOMRefCell::new(tok),
pending_input: DOMRefCell::new(vec!()),
document: JS::from_ref(document),
suspended: Cell::new(false),
last_chunk_received: Cell::new(false),
pipeline: pipeline,
};
reflect_dom_object(box parser, document.window(), ServoXMLParserBinding::Wrap)
}
pub fn window(&self) -> &Window {
self.document.window()
}
pub fn resume(&self) {
assert!(self.suspended.get());
self.suspended.set(false);
self.parse_sync();
}
pub fn suspend(&self) {
assert!(!self.suspended.get());
self.suspended.set(true);
}
pub fn is_suspended(&self) -> bool {
self.suspended.get()
}
pub fn parse_sync(&self) {
// This parser will continue to parse while there is either pending input or
// the parser remains unsuspended.
loop {
self.document.reflow_if_reflow_timer_expired();
let mut pending_input = self.pending_input.borrow_mut();
if !pending_input.is_empty() {
let chunk = pending_input.remove(0);
self.tokenizer.borrow_mut().feed(chunk.into());
} else {
self.tokenizer.borrow_mut().run();
}
// Document parsing is blocked on an external resource.
if self.suspended.get() {
return;
}
if pending_input.is_empty() {
break;
}
}
if self.last_chunk_received.get() {
self.finish();
}
}
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);
}
}
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