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Make external script sources load asynchronously, yet still block further parsing. Hook up document loading to async networking events.

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This commit is contained in:
Josh Matthews 2015-03-11 10:44:59 -04:00
parent e52197d126
commit 8082df7d0d
32 changed files with 441 additions and 276 deletions
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109
components/script/parse/html.rs
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@ -4,7 +4,7 @@
#![allow(unsafe_code, unrooted_must_root)]
use document_loader::{DocumentLoader, LoadType};
use document_loader::DocumentLoader;
use dom::attr::AttrHelpers;
use dom::bindings::codegen::Bindings::DocumentBinding::DocumentMethods;
use dom::bindings::codegen::Bindings::NodeBinding::NodeMethods;
@ -32,13 +32,10 @@ use dom::servohtmlparser::{ServoHTMLParser, FragmentContext};
use dom::text::Text;
use parse::Parser;
use encoding::all::UTF_8;
use encoding::types::{Encoding, DecoderTrap};
use encoding::types::Encoding;
use net_traits::{ProgressMsg, LoadResponse};
use msg::constellation_msg::PipelineId;
use util::str::DOMString;
use util::task_state;
use util::task_state::IN_HTML_PARSER;
use std::borrow::Cow;
use std::io::{self, Write};
use url::Url;
@ -49,14 +46,6 @@ use html5ever::serialize::TraversalScope::{IncludeNode, ChildrenOnly};
use html5ever::tree_builder::{TreeSink, QuirksMode, NodeOrText, AppendNode, AppendText, NextParserState};
use string_cache::QualName;
use hyper::header::ContentType;
use hyper::mime::{Mime, TopLevel, SubLevel};
pub enum HTMLInput {
InputString(String),
InputUrl(LoadResponse),
}
trait SinkHelpers {
fn get_or_create(&self, child: NodeOrText<JS<Node>>) -> Temporary<Node>;
}
@ -183,7 +172,9 @@ impl<'a> TreeSink for servohtmlparser::Sink {
fn complete_script(&mut self, node: JS<Node>) -> NextParserState {
let node: Root<Node> = node.root();
let script: Option<JSRef<HTMLScriptElement>> = HTMLScriptElementCast::to_ref(node.r());
script.map(|script| script.prepare());
if let Some(script) = script {
return script.prepare();
}
NextParserState::Continue
}
@ -272,80 +263,22 @@ impl<'a> Serializable for JSRef<'a, Node> {
}
}
pub enum ParseContext<'a> {
Fragment(FragmentContext<'a>),
Owner(Option<PipelineId>),
}
pub fn parse_html(document: JSRef<Document>,
input: HTMLInput,
input: String,
url: &Url,
fragment_context: Option<FragmentContext>) {
let parser = match fragment_context {
None => ServoHTMLParser::new(Some(url.clone()), document).root(),
Some(fc) => ServoHTMLParser::new_for_fragment(Some(url.clone()), document, fc).root(),
};
let parser: JSRef<ServoHTMLParser> = parser.r();
let nested_parse = task_state::get().contains(task_state::IN_HTML_PARSER);
if !nested_parse {
task_state::enter(IN_HTML_PARSER);
}
fn parse_progress(document: JSRef<Document>, parser: JSRef<ServoHTMLParser>, url: &Url, load_response: &LoadResponse) {
for msg in load_response.progress_port.iter() {
match msg {
ProgressMsg::Payload(data) => {
// FIXME: use Vec<u8> (html5ever #34)
let data = UTF_8.decode(&data, DecoderTrap::Replace).unwrap();
parser.parse_chunk(data);
}
ProgressMsg::Done(Err(err)) => {
debug!("Failed to load page URL {}, error: {}", url.serialize(), err);
// TODO(Savago): we should send a notification to callers #5463.
break;
}
ProgressMsg::Done(Ok(())) => {
document.finish_load(LoadType::PageSource(url.clone()));
break;
}
}
}
};
match input {
HTMLInput::InputString(s) => {
parser.parse_chunk(s);
}
HTMLInput::InputUrl(load_response) => {
match load_response.metadata.content_type {
Some(ContentType(Mime(TopLevel::Image, _, _))) => {
let page = format!("<html><body><img src='{}' /></body></html>", url.serialize());
parser.parse_chunk(page);
document.finish_load(LoadType::PageSource(url.clone()));
},
Some(ContentType(Mime(TopLevel::Text, SubLevel::Plain, _))) => {
// FIXME: When servo/html5ever#109 is fixed remove <plaintext> usage and
// replace with fix from that issue.
// text/plain documents require setting the tokenizer into PLAINTEXT mode.
// This is done by using a <plaintext> element as the html5ever tokenizer
// provides no other way to change to that state.
// Spec for text/plain handling is:
// https://html.spec.whatwg.org/multipage/#read-text
let page = format!("<pre>\u{000A}<plaintext>");
parser.parse_chunk(page);
parse_progress(document, parser, url, &load_response);
},
_ => {
parse_progress(document, parser, url, &load_response);
}
}
}
}
parser.finish();
if !nested_parse {
task_state::exit(IN_HTML_PARSER);
}
debug!("finished parsing");
context: ParseContext) {
let parser = match context {
ParseContext::Owner(owner) =>
ServoHTMLParser::new(Some(url.clone()), document, owner),
ParseContext::Fragment(fc) =>
ServoHTMLParser::new_for_fragment(Some(url.clone()), document, fc),
}.root();
parser.r().parse_chunk(input);
}
// https://html.spec.whatwg.org/multipage/#parsing-html-fragments
@ -376,7 +309,7 @@ pub fn parse_html_fragment(context_node: JSRef<Node>,
context_elem: context_node,
form_elem: form.r(),
};
parse_html(document.r(), HTMLInput::InputString(input), &url, Some(fragment_context));
parse_html(document.r(), input, &url, ParseContext::Fragment(fragment_context));
// Step 14.
let root_element = document.r().GetDocumentElement().expect("no document element").root();