[pascal mode] Add highlighting for comments with curly brackets

See codemirror#5523

Author: BrianHung

mode/pascal/pascal.js

@@ -50,7 +50,11 @@ CodeMirror.defineMode("pascal", function() {
       state.tokenize = tokenComment;
       return tokenComment(stream, state);
     }
-    if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
+    if (ch == "{") {
+      state.tokenize = tokenCommentBraces;
+      return tokenCommentBraces(stream, state);
+    }
+    if (/[\[\]\(\),;\:\.]/.test(ch)) {
       return null;
     }
     if (/\d/.test(ch)) {
@@ -98,6 +102,17 @@ CodeMirror.defineMode("pascal", function() {
     return "comment";
   }
 
+  function tokenCommentBraces(stream, state) {
+    var ch;
+    while (ch = stream.next()) {
+      if (ch == "}") {
+        state.tokenize = null;
+        break;
+      }
+    }
+    return "comment";    
+  }
+
   // Interface
 
   return {