Grammar: Added regex support

src/Grammar.cpp

@@ -156,7 +156,7 @@ std::string Grammar::dump () const
       {
         out << term._token;
         if (term._decoration != "")
-          out << term._decoration;
+          out << " " << term._decoration;
         out << " ";
       }
 
@@ -187,7 +187,8 @@ void Grammar::validate () const
     {
       for (auto& token : production)
       {
-        if (token._token.front () != '"')
+        if (token._token.front () != '"' and
+            token._token.front () != '/')
           allTokens.push_back (token._token);
 
         if (token._token == production[0]._token &&
@@ -213,7 +214,8 @@ void Grammar::validate () const
     throw format ("Definition '{1}' is left recursive.", lr);
 
   for (auto& r : allRules)
-    if (r[0] == '"')
+    if (r[0] == '"' or
+        r[0] == '/')
       throw format ("Definition '{1}' must not be a literal.");
 
   // Unused definitions - these are names in _rules that are never

src/grammar.cfg

@@ -18,18 +18,18 @@
 #  A -> B <op> A
 #       B
 
-cli: "start":ai
-     "stop":ai
-     "track":ai
+cli: "start" :ai
+     "stop" :ai
+     "track" :ai
      help               # Non-terminal, cannot contain є.
      є
 
 
-help: "help":ai topic
-      "help":ai
+help: "help" :ai topic
+      "help" :ai
 
-topic: "usage":ai
-       "dates":ai
-       "times":ai
+topic: "usage" :ai
+       /dates?/ :ai
+       /times?/ :ai