Add basic support for C and C++ syntax highlighting

Author: parlough

site/lib/src/highlight/theme/dark.dart

@@ -65,6 +65,13 @@ final Map<Tag, TextStyle> dashDarkTheme = {
       blue: 0x7E,
     ),
   ),
+  const Tag('name', parent: Tags.preprocessorDirective): const TextStyle(
+    foregroundColor: Color.fromArgb(
+      red: 0xFF,
+      green: 0x89,
+      blue: 0x7E,
+    ),
+  ),
 
   Tags.operator: const TextStyle(
     foregroundColor: Color.fromArgb(

site/lib/src/highlight/theme/light.dart

@@ -65,6 +65,13 @@ final Map<Tag, TextStyle> dashLightTheme = {
       blue: 0x14,
     ),
   ),
+  const Tag('name', parent: Tags.preprocessorDirective): const TextStyle(
+    foregroundColor: Color.fromArgb(
+      red: 0xBD,
+      green: 0x23,
+      blue: 0x14,
+    ),
+  ),
 
   Tags.operator: const TextStyle(
     foregroundColor: Color.fromArgb(

site/pubspec.yaml

@@ -20,7 +20,7 @@ dependencies:
   markdown_description_list: ^0.1.1
   meta: ^1.17.0
   # Used for syntax highlighting.
-  opal: ^0.1.0
+  opal: ^0.2.0
   path: ^1.9.1
   pub_semver: ^2.2.0
   universal_web: ^1.1.1+1