* Draft implementation of info diagram

* Fix for issue #109

src/diagrams/example/parser/example.jison

@@ -0,0 +1,53 @@
+/** js sequence diagrams
+ *  http://bramp.github.io/js-sequence-diagrams/
+ *  (c) 2012-2013 Andrew Brampton (bramp.net)
+ *  Simplified BSD license.
+ */
+%lex
+
+%options case-insensitive
+
+%{
+	// Pre-lexer code can go here
+%}
+
+%%
+
+[\n]+             return 'NL';
+"showInfo"		  return 'showInfo';
+"info"		  return 'info';
+"say"			  return 'say';
+":"[^#\n;]+       return 'TXT';
+<<EOF>>           return 'EOF';
+.                 return 'INVALID';
+
+/lex
+
+%start start
+
+%% /* language grammar */
+
+start
+	: info document 'EOF' { return yy; }
+	;
+
+document
+	: /* empty */
+	| document line
+	;
+
+line
+	: statement { }
+	| 'NL'
+	;
+
+statement
+	:  showInfo   { yy.setInfo(true);  }
+	|  message    { yy.setMessage($1);  }
+	;
+
+message
+	: 'say' TXT { $$ = $1.substring(1).trim().replace(/\\n/gm, "\n"); }
+	;
+
+%%