Changed the css parsing to be called when a <link /> is used instead of guessing the filename.

src/servo/content.rs

@@ -63,39 +63,22 @@ fn Content(layout: Layout) -> Content {
               ParseMsg(filename) {
                 #debug["content: Received filename `%s` to parse", *filename];
 
-                // TODO actually parse where the css sheet should be
-                // Replace .html with .css and try to open a stylesheet
-                assert (*filename).ends_with(".html");
-                let new_file = (*filename).substr(0u, (*filename).len() - 5u) + ".css";
-
-                // Send off a task to parse the stylesheet
-                let css_port = port();
-                let css_chan = chan(css_port);
-                spawn { ||
-                    let new_file = copy new_file;
-                    let css_stream = spawn_css_lexer_task(~new_file);
-                    let css_rules = build_stylesheet(css_stream);
-                    css_chan.send(css_rules);
-                };
-
                 // Note: we can parse the next document in parallel
                 // with any previous documents.
                 let stream = spawn_html_lexer_task(copy filename);
-                let root = build_dom(scope, stream);
+                let (root, style_port) = build_dom(scope, stream);
            
                 // Collect the css stylesheet
-                let css_rules = css_port.recv();
+                let css_rules = style_port.recv();
                 
                 // Apply the css rules to the dom tree:
-                // TODO
                 #debug["%s", print_sheet(css_rules)];
-                
-               
+
                 // Now, join the layout so that they will see the latest
                 // changes we have made.
                 join_layout(scope, layout);
 
-                // Send new document to layout.
+                // Send new document and relevant styles to layout
                 layout.send(BuildMsg(root, css_rules));
 
                 // Indicate that reader was forked so any further

src/servo/parser/css_builder.rs

@@ -48,8 +48,8 @@ fn parse_element(reader : TokenReader) -> option<~selector> {
             break;
           }
           Eof              { ret none; }          
-          Element(_)          { fail "Unexpected second element without " +
-                                   "relation to first element"; }
+          Element(_)          { fail "Unexpected second element without "
+                                   + "relation to first element"; }
           EndDescription         { fail "Unexpected '}'"; }
           Description(_, _)       { fail "Unexpected description"; }
         }

src/servo/parser/html_builder.rs

@@ -9,9 +9,15 @@ import gfx::geometry;
 import gfx::geometry::au;
 import parser = parser::html_lexer;
 import parser::Token;
+import dom::style::stylesheet;
 
 import dvec::extensions;
 
+enum css_message {
+    file(~str),
+    exit   
+}
+
 #[warn(no_non_implicitly_copyable_typarams)]
 fn link_up_attribute(scope: NodeScope, node: Node, -key: str, -value: str) {
     // TODO: Implement atoms so that we don't always perform string comparisons.
@@ -66,9 +72,69 @@ fn build_element_kind(tag_name: str) -> ~ElementKind {
     }
 }
 
-fn build_dom(scope: NodeScope, stream: port<Token>) -> Node {
+#[doc="Runs a task that coordinates parsing links to css stylesheets.
+
+This function should be spawned in a separate task and spins waiting
+for the html builder to find links to css stylesheets and sends off
+tasks to parse each link.  When the html process finishes, it notifies
+the listener, who then collects the css rules from each task it
+spawned, collates them, and sends them to the given result channel.
+
+# Arguments
+
+* `to_parent` - A channel on which to send back the full set of rules.
+* `from_parent` - A port on which to receive new links.
+
+"]
+fn css_link_listener(to_parent : chan<stylesheet>, from_parent : port<css_message>) {
+    let mut result_vec = [];
+
+    loop {
+        alt from_parent.recv() {
+          file(filename) {
+            let result_port = comm::port();
+            let result_chan = comm::chan(result_port);
+            let filename = copy filename;
+            task::spawn{ ||
+                //TODO: deal with extraneous copies
+                let filename <- copy filename;
+                let css_stream = css_lexer::spawn_css_lexer_task(filename);
+                let mut css_rules = css_builder::build_stylesheet(css_stream);
+                result_chan.send(css_rules);
+            }
+            result_vec += [result_port];
+          }
+          exit {
+            break;
+          }
+        }
+    }
+
+    let css_rules = [];
+    
+    let css_rules = result_vec.foldl(css_rules) { |rules, result_port|
+        let new_rules = result_port.recv();
+        rules + new_rules
+    };
+
+    to_parent.send(css_rules);
+}
+
+#[warn(no_non_implicitly_copyable_typarams)]
+fn build_dom(scope: NodeScope, stream: port<Token>) -> (Node, port<stylesheet>) {
     // The current reference node.
-    let mut cur = scope.new_node(Element(ElementData("html", ~HTMLDivElement)));
+    let mut cur_node = scope.new_node(Element(ElementData("html", ~HTMLDivElement)));
+    // We will spawn a separate task to parse any css that is
+    // encountered, each link to a stylesheet is sent to the waiting
+    // task.  After the html sheet has been fully read, the spawned
+    // task will collect the results of all linked style data and send
+    // it along the returned port.
+    let style_port = comm::port();
+    let child_chan = comm::chan(style_port);
+    let style_chan = task::spawn_listener { |child_port|
+        css_link_listener(child_chan, child_port);
+    };
+
     loop {
         let token = stream.recv();
         alt token {
@@ -77,26 +143,48 @@ fn build_dom(scope: NodeScope, stream: port<Token>) -> Node {
             #debug["starting tag %s", tag_name];
             let element_kind = build_element_kind(tag_name);
             let new_node = scope.new_node(Element(ElementData(copy tag_name, element_kind)));
-            scope.add_child(cur, new_node);
-            cur = new_node;
+            scope.add_child(cur_node, new_node);
+            cur_node = new_node;
           }
           parser::Attr(key, value) {
             #debug["attr: %? = %?", key, value];
-            link_up_attribute(scope, cur, copy key, copy value);
+            link_up_attribute(scope, cur_node, copy key, copy value);
           }
           parser::EndOpeningTag {
             #debug("end opening tag");
           }
-          
-          parser::EndTag(_) | parser::SelfCloseTag {
+          // TODO: Fail more gracefully (i.e. according to the HTML5
+          //       spec) if we close more tags than we open.
+          parser::SelfCloseTag {
+            //TODO: check for things other than the link tag
+            scope.read(cur_node) { |n|
+                alt *n.kind {
+                  Element(elmt) if elmt.tag_name == "link" {
+                    alt elmt.get_attr("rel") {
+                      some(r) if r == "stylesheet" {
+                        alt elmt.get_attr("href") {
+                          some(filename) {
+                            #debug["Linking to a css sheet named: %s", filename];
+                            style_chan.send(file(~copy filename));
+                          }
+                          none { /* fall through*/ }
+                        }
+                      }
+                      _ { /* fall through*/ }
+                    }
+                  }
+                  _ { /* fall through*/ }
+                }                
+            }
+            cur_node = scope.get_parent(cur_node).get();
+          }
+          parser::EndTag(_) {
             // TODO: Assert that the closing tag has the right name.
-            // TODO: Fail more gracefully (i.e. according to the HTML5
-            //       spec) if we close more tags than we open.
-            cur = scope.get_parent(cur).get();
+            cur_node = scope.get_parent(cur_node).get();
           }
           parser::Text(s) if !s.is_whitespace() {
             let new_node = scope.new_node(Text(copy s));
-            scope.add_child(cur, new_node);
+            scope.add_child(cur_node, new_node);
           }
           parser::Text(_) {
             // FIXME: Whitespace should not be ignored.
@@ -106,6 +194,8 @@ fn build_dom(scope: NodeScope, stream: port<Token>) -> Node {
           }
         }
     }
-    ret cur;
-}
 
+    style_chan.send(exit);
+
+    ret (cur_node, style_port);
+}

src/servo/parser/html_lexer.rs

@@ -99,8 +99,19 @@ impl html_methods for HtmlLexer {
         }
 
         if ch == ('/' as u8) {
-            self.parser_state = NormalHtml;
-            ret SelfCloseTag;
+            alt self.input_state.get() {
+              CoeChar(c) {
+                if c == ('>' as u8) {
+                    self.parser_state = NormalHtml;
+                    ret SelfCloseTag;
+                } else {
+                    #warn["/ not followed by > in a tag"];
+                }
+              }
+              CoeEof {
+                #warn["/ not followed by > at end of file"];
+              }
+            }
         }
 
         if !ch.is_alpha() {
@@ -116,8 +127,8 @@ impl html_methods for HtmlLexer {
                 attribute_name += [c];
               }
               CoeEof {
-                ret Attr(attribute_name.to_str(),
-                            attribute_name.to_str()); }
+                ret Attr(attribute_name.to_str(), attribute_name.to_str());
+              }
             }
         }
 
@@ -131,8 +142,7 @@ impl html_methods for HtmlLexer {
                 attribute_value += [c];
               }
               CoeEof {
-                ret Attr(attribute_name.to_str(),
-                            attribute_value.to_str());
+                ret Attr(attribute_name.to_str(), attribute_value.to_str());
               }
             }
         }
@@ -151,10 +161,13 @@ fn lexer(reader: io::reader, state : ParseState) -> HtmlLexer {
 
 #[warn(no_non_implicitly_copyable_typarams)]
 fn spawn_html_lexer_task(-filename: ~str) -> port<Token> {
-    let result_port = port();
-    let result_chan = chan(result_port);
+    let html_port = port();
+    let html_chan = chan(html_port);
+    let html_file = copy filename;
+
     task::spawn {||
-        assert (*copy filename).ends_with(".html");
+        let filename = copy html_file;
+        assert (copy *filename).ends_with(".html");
         let file_data = io::read_whole_file(*filename).get();
         let reader = io::bytes_reader(file_data);
         
@@ -163,9 +176,10 @@ fn spawn_html_lexer_task(-filename: ~str) -> port<Token> {
         loop {
             let token = lexer.parse_html();
             let should_break = token == Eof;
-            result_chan.send(token);
+            html_chan.send(token);
             if should_break { break; }
         }
     };
-    ret result_port;
+
+    ret html_port;
 }

src/test/head_link_test.html

@@ -0,0 +1,6 @@
+<head>
+  <link rel="stylesheet" href="test_linking.css" />
+</head>
+<body>
+  <img></img>
+</body>

src/test/lots_of_background_colors.css

@@ -4,13 +4,13 @@
 .white {background-color : white}
 .black {background-color : black}
 .brown {background-color : rgb(200,100,0)}
-.gray {background-color : rgb(100,100,100)}
+.gray {background-color : gray}
 .lightgray {background-color : rgb(200,200,200)}
 .darkgray {background-color : rgb(50,50,50)}
-.cyan {background-color : rgb(0,255,255)}
-.maroon {background-color : rgb(100,0,20)}
+.cyan {background-color : aqua)}
+.maroon {background-color : maroon}
 .pink {background-color : rgb(255,0,255)}
 .orange {background-color : rgb(255,175,0)}
 .violet {background-color : rgb(100,0,150)}
 .darkgreen {background-color : rgb(0,100,0)}
-.darkblue {background-color : rgb(0,0,100)}
+.darkblue {background-color : navy}

src/test/small-layout-test.html

@@ -1,4 +1,9 @@
-<div class="gray">
+<head>
+  <link rel="stylesheet" href="lots_of_background_colors.css" />
+</head>
+<body>
+  <div class="gray">
     <img class="green"></img>
     <div class="blue"><img class="red"></img></div>
-</div>
+  </div>
+</body>

src/test/small_color_test.html

@@ -1 +1,6 @@
-<img></img>
+<head>
+  <link rel="stylesheet" href="small_color_test.css" />
+</head>
+<body>
+  <img></img>
+</body>

src/test/test_bg_color.css

@@ -1,16 +0,0 @@
-.green {background-color : green}
-.blue {background-color : blue}
-.red {background-color : red}
-.white {background-color : white}
-.black {background-color : black}
-.brown {background-color : rgb(200,100,0)}
-.gray {background-color : rgb(100,100,100)}
-.lightgray {background-color : rgb(200,200,200)}
-.darkgray {background-color : rgb(50,50,50)}
-.cyan {background-color : rgb(0,255,255)}
-.maroon {background-color : rgb(100,0,20)}
-.pink {background-color : rgb(255,0,255)}
-.orange {background-color : rgb(255,175,0)}
-.violet {background-color : rgb(100,0,150)}
-.darkgreen {background-color : rgb(0,100,0)}
-.darkblue {background-color : rgb(0,0,100)}

src/test/test_bg_color.html

@@ -1,4 +1,8 @@
-<div class="darkgray">
+<head>
+  <link rel="stylesheet" href="lots_of_background_colors.css" />
+</head>
+<body>
+  <div class="darkgray">
     <div class="darkblue">
       <img class="maroon"></img>
       <div class="darkgreen">
@@ -15,4 +19,5 @@
       <img class="blue"></img>
       <img class="red"></img>
     </div>
-</div>
+  </div>
+</body>

src/test/test_inline_boxes.css

@@ -1,16 +0,0 @@
-.green {background-color : green}
-.blue {background-color : blue}
-.red {background-color : red}
-.white {background-color : white}
-.black {background-color : black}
-.brown {background-color : rgb(200,100,0)}
-.gray {background-color : rgb(100,100,100)}
-.lightgray {background-color : rgb(200,200,200)}
-.darkgray {background-color : rgb(50,50,50)}
-.cyan {background-color : rgb(0,255,255)}
-.maroon {background-color : rgb(100,0,20)}
-.pink {background-color : rgb(255,0,255)}
-.orange {background-color : rgb(255,175,0)}
-.violet {background-color : rgb(100,0,150)}
-.darkgreen {background-color : rgb(0,100,0)}
-.darkblue {background-color : rgb(0,0,100)}

src/test/test_inline_boxes.html

@@ -1,6 +1,11 @@
-<div class="darkgray">
-  <div class="blue">
-    <img class="red"></img>
+<head>
+  <link rel="stylesheet" href="lots_of_background_colors.css" />
+</head>
+<body>
+  <div class="darkgray">
+    <div class="blue">
+      <img class="red"></img>
+    </div>
+    <img class="green"></img>
   </div>
-  <img class="green"></img>
-</div>
+</body>

src/test/test_linking.css

@@ -0,0 +1 @@
+img {background-color : green}