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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::comm::{channel, Receiver};
use encoding::EncodingRef;
use encoding::all::UTF_8;
use style::Stylesheet;
use servo_net::resource_task::{Load, LoadData, LoadResponse, ProgressMsg, Payload, Done, ResourceTask};
use servo_util::task::spawn_named;
use url::Url;
/// Where a style sheet comes from.
pub enum StylesheetProvenance {
UrlProvenance(Url, ResourceTask),
InlineProvenance(Url, String),
}
// Parses the style data and returns the stylesheet
pub fn parse_inline_css(url: Url, data: String) -> Stylesheet {
parse_css(InlineProvenance(url, data))
}
fn parse_css(provenance: StylesheetProvenance) -> Stylesheet {
// TODO: Get the actual value. http://dev.w3.org/csswg/css-syntax/#environment-encoding
let environment_encoding = UTF_8 as EncodingRef;
match provenance {
UrlProvenance(url, resource_task) => {
debug!("cssparse: loading style sheet at {:s}", url.serialize());
let (input_chan, input_port) = channel();
resource_task.send(Load(LoadData::new(url), input_chan));
let LoadResponse { metadata: metadata, progress_port: progress_port , ..}
= input_port.recv();
let final_url = &metadata.final_url;
let protocol_encoding_label = metadata.charset.as_ref().map(|s| s.as_slice());
let iter = ProgressMsgPortIterator { progress_port: progress_port };
Stylesheet::from_bytes_iter(
iter, final_url.clone(),
protocol_encoding_label, Some(environment_encoding))
}
InlineProvenance(base_url, data) => {
debug!("cssparse: loading inline stylesheet {:s}", data);
Stylesheet::from_str(data.as_slice(), base_url)
}
}
}
pub fn spawn_css_parser(provenance: StylesheetProvenance) -> Receiver<Stylesheet> {
let (result_chan, result_port) = channel();
spawn_named("cssparser", proc() {
result_chan.send(parse_css(provenance));
});
return result_port;
}
struct ProgressMsgPortIterator {
progress_port: Receiver<ProgressMsg>
}
impl Iterator<Vec<u8>> for ProgressMsgPortIterator {
fn next(&mut self) -> Option<Vec<u8>> {
match self.progress_port.recv() {
Payload(data) => Some(data),
Done(..) => None
}
}
}
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