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https://github.com/servo/servo.git
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72 lines
2.5 KiB
Rust
72 lines
2.5 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/// Some little helpers for hooking up the HTML parser with the CSS parser.
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use std::comm::{channel, Receiver};
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use encoding::EncodingRef;
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use encoding::all::UTF_8;
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use style::Stylesheet;
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use servo_net::resource_task::{Load, LoadData, LoadResponse, ProgressMsg, Payload, Done, ResourceTask};
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use servo_util::task::spawn_named;
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use url::Url;
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/// Where a style sheet comes from.
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pub enum StylesheetProvenance {
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UrlProvenance(Url, ResourceTask),
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InlineProvenance(Url, String),
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}
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// Parses the style data and returns the stylesheet
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pub fn parse_inline_css(url: Url, data: String) -> Stylesheet {
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parse_css(InlineProvenance(url, data))
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}
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fn parse_css(provenance: StylesheetProvenance) -> Stylesheet {
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// TODO: Get the actual value. http://dev.w3.org/csswg/css-syntax/#environment-encoding
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let environment_encoding = UTF_8 as EncodingRef;
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match provenance {
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UrlProvenance(url, resource_task) => {
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debug!("cssparse: loading style sheet at {:s}", url.serialize());
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let (input_chan, input_port) = channel();
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resource_task.send(Load(LoadData::new(url), input_chan));
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let LoadResponse { metadata: metadata, progress_port: progress_port , ..}
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= input_port.recv();
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let final_url = &metadata.final_url;
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let protocol_encoding_label = metadata.charset.as_ref().map(|s| s.as_slice());
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let iter = ProgressMsgPortIterator { progress_port: progress_port };
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Stylesheet::from_bytes_iter(
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iter, final_url.clone(),
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protocol_encoding_label, Some(environment_encoding))
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}
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InlineProvenance(base_url, data) => {
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debug!("cssparse: loading inline stylesheet {:s}", data);
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Stylesheet::from_str(data.as_slice(), base_url)
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}
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}
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}
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pub fn spawn_css_parser(provenance: StylesheetProvenance) -> Receiver<Stylesheet> {
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let (result_chan, result_port) = channel();
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spawn_named("cssparser", proc() {
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result_chan.send(parse_css(provenance));
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});
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return result_port;
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}
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struct ProgressMsgPortIterator {
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progress_port: Receiver<ProgressMsg>
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}
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impl Iterator<Vec<u8>> for ProgressMsgPortIterator {
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fn next(&mut self) -> Option<Vec<u8>> {
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match self.progress_port.recv() {
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Payload(data) => Some(data),
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Done(..) => None
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}
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}
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}
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