[swift mode] Correctly highlight nested comments

mode/swift/swift.js

@@ -138,8 +138,17 @@
   }
 
   function tokenComment(stream, state) {
-    stream.match(/^(?:[^*]|\*(?!\/))*/)
-    if (stream.match("*/")) state.tokenize.pop()
+    var ch
+    while (true) {
+      stream.match(/^[^/*]+/, true)
+      ch = stream.next()
+      if (!ch) break
+      if (ch === "/" && stream.eat("*")) {
+        state.tokenize.push(tokenComment)
+      } else if (ch === "*" && stream.eat("/")) {
+        state.tokenize.pop()
+      }
+    }
     return "comment"
   }
 

mode/swift/test.js

@@ -142,6 +142,13 @@
      "[variable print][punctuation (][variable foo][property ._123][punctuation )]",
      "[variable print][punctuation (]")
 
+  MT("nested_comments",
+     "[comment /*]",
+     "[comment But wait /* this is a nested comment */ for real]",
+     "[comment /**** let * me * show * you ****/]",
+     "[comment ///// let / me / show / you /////]",
+     "[comment */]");
+
   // TODO: correctly identify when multiple variables are being declared
   // by use of a comma-separated list.
   // TODO: correctly identify when variables are being declared in a tuple.