Cargoify servo

components/script/html/cssparse.rs

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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
+        }
+    }
+}