Add skeleton for layout thread reflow

src/compositing.rs

@@ -0,0 +1,51 @@
+use crate::layout::LayoutSize;
+use crate::types::Result;
+
+// See https://github.com/servo/servo/blob/5d7ed76b79de359ef1de2bdee83b32bd497d7cd8/third_party/webrender/webrender_api/src/display_list.rs#L112
+pub struct BuiltDisplayList;
+
+impl BuiltDisplayList {
+    pub fn into_data(self) -> (Vec<u8>, BuiltDisplayListDescriptor) {
+        (Vec::new(), BuiltDisplayListDescriptor)
+    }
+}
+
+// See https://github.com/servo/servo/blob/5d7ed76b79de359ef1de2bdee83b32bd497d7cd8/third_party/webrender/webrender_api/src/display_list.rs#L136
+pub struct BuiltDisplayListDescriptor;
+
+// See ipc_channel crate
+pub struct IpcSender;
+
+impl IpcSender {
+    pub fn send(&self, _message: ScriptToCompositorMsg) -> Result<()> {
+        todo!()
+    }
+}
+
+// See https://github.com/servo/servo/blob/5d7ed76b79de359ef1de2bdee83b32bd497d7cd8/components/shared/script/compositor.rs#L216
+pub struct CompositorDisplayListInfo {
+    pub content_size: LayoutSize,
+}
+
+// See https://github.com/servo/servo/blob/5d7ed76b79de359ef1de2bdee83b32bd497d7cd8/components/shared/script/lib.rs#L1119
+pub enum ScriptToCompositorMsg {
+    SendDisplayList {
+        display_list_info: CompositorDisplayListInfo,
+        display_list_descriptor: BuiltDisplayListDescriptor,
+    },
+}
+
+// See https://github.com/servo/servo/blob/5d7ed76b79de359ef1de2bdee83b32bd497d7cd8/components/shared/compositing/lib.rs#L182
+pub enum ForwardedToCompositorMsg {
+    Layout(ScriptToCompositorMsg),
+}
+
+// See https://github.com/servo/servo/blob/5d7ed76b79de359ef1de2bdee83b32bd497d7cd8/components/compositing/compositor.rs#L128
+pub struct IOCompositor;
+
+impl IOCompositor {
+    #[allow(unused)]
+    fn handle_webrender_message(&self, _message: ForwardedToCompositorMsg) {
+        todo!()
+    }
+}

src/css3.rs

@@ -111,10 +111,17 @@
 //! ;
 //! ```
 //!
+use self::{node::StyleSheet, parser::CSS3Parser};
+use crate::types::Result;
+
 pub mod new_parser;
 pub mod new_tokenizer;
 pub mod node;
 pub mod parser;
 pub mod tokenizer;
 pub mod tokens;
 pub mod unicode;
+
+pub fn parse(s: &str) -> Result<StyleSheet> {
+    CSS3Parser::new().parse(s)
+}