Add class name literals, with less conflicts.

src/diagrams/class/parser/classDiagram.jison

@@ -7,6 +7,7 @@
 /* lexical grammar */
 %lex
 %x string
+%x bqstring
 %x generic
 %x struct
 %x href
@@ -49,6 +50,10 @@
 <string>["]           this.popState();
 <string>[^"]*         return "STR";
 
+[`]                   this.begin("bqstring");
+<bqstring>[`]         this.popState();
+<bqstring>[^`]+       return "BQUOTE_STR";
+
 /*
 ---interactivity command---
 'href' adds a link to the specified node. 'href' can only be specified when the
@@ -215,9 +220,10 @@ statements
 
 className
     : alphaNumToken { $$=$1; }
+    | classLiteralName { $$=$1; }
     | alphaNumToken className { $$=$1+$2; }
-    | alphaNumToken GENERICTYPE className { $$=$1+'~'+$2+$3; }
     | alphaNumToken GENERICTYPE { $$=$1+'~'+$2; }
+    | classLiteralName GENERICTYPE { $$=$1+'~'+$2; }
     ;
 
 statement
@@ -309,4 +315,6 @@ textNoTagsToken: alphaNumToken | SPACE | MINUS | keywords ;
 
 alphaNumToken  : UNICODE_TEXT | NUM | ALPHA;
 
+classLiteralName : BQUOTE_STR;
+
 %%