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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/. */
/// Some little helpers for hooking up the HTML parser with the CSS parser.
use std::cell::Cell;
use std::comm;
use std::comm::Port;
use std::task;
use newcss::stylesheet::Stylesheet;
use newcss::util::DataStream;
use servo_net::resource_task::{Load, LoadResponse, Payload, Done, ResourceTask, ProgressMsg};
use extra::url::Url;
/// Where a style sheet comes from.
pub enum StylesheetProvenance {
UrlProvenance(Url),
InlineProvenance(Url, ~str),
}
pub fn spawn_css_parser(provenance: StylesheetProvenance,
resource_task: ResourceTask)
-> Port<Stylesheet> {
let (result_port, result_chan) = comm::stream();
let provenance_cell = Cell::new(provenance);
do task::spawn {
let url = do provenance_cell.with_ref |p| {
match *p {
UrlProvenance(ref the_url) => (*the_url).clone(),
InlineProvenance(ref the_url, _) => (*the_url).clone()
}
};
let sheet = Stylesheet::new(url, data_stream(provenance_cell.take(),
resource_task.clone()));
result_chan.send(sheet);
}
return result_port;
}
fn data_stream(provenance: StylesheetProvenance, resource_task: ResourceTask) -> @mut DataStream {
match provenance {
UrlProvenance(url) => {
debug!("cssparse: loading style sheet at %s", url.to_str());
let (input_port, input_chan) = comm::stream();
resource_task.send(Load(url, input_chan));
resource_port_to_data_stream(input_port)
}
InlineProvenance(_, data) => {
data_to_data_stream(data)
}
}
}
fn resource_port_to_data_stream(input_port: Port<LoadResponse>) -> @mut DataStream {
let progress_port = input_port.recv().progress_port;
struct ResourcePortDataStream {
progress_port: Port<ProgressMsg>,
};
impl DataStream for ResourcePortDataStream {
fn read(&mut self) -> Option<~[u8]> {
match self.progress_port.recv() {
Payload(data) => Some(data),
Done(*) => None
}
}
}
let stream = @mut ResourcePortDataStream {
progress_port: progress_port,
};
stream as @mut DataStream
}
fn data_to_data_stream(data: ~str) -> @mut DataStream {
let data_cell = Cell::new(data);
struct DataDataStream {
data_cell: Cell<~str>,
};
impl DataStream for DataDataStream {
fn read(&mut self) -> Option<~[u8]> {
if self.data_cell.is_empty() {
None
} else {
// FIXME: Blech, a copy.
let data = self.data_cell.take();
Some(data.as_bytes().to_owned())
}
}
}
let stream = @mut DataDataStream {
data_cell: data_cell,
};
stream as @mut DataStream
}
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