Add new comments and lines

grammar/bf.g4

@@ -1,20 +1,42 @@
 grammar bf;
 
-program:
-    statements* EOF;
+program
+    : statements* EOF;
 
-statements:
-    statement+;
-    
-statement:
-      INC
-    | DEC
-    | INPUT
-    | OUTPUT
+statements
+    : (statement|numberedStatement|loopStmt)+;
+
+loopStmt
+    : LOOPSTART statements LOOPEND
+    ;
+
+numberedStatement
+    : statement NUMBER
+    ;
+
+statement
+    : INC
+    | DEC 
+    | LEFT 
+    | RIGHT
+    | inputStmt
+    | outputStmt
+    ;
+
+inputStmt
+    : INPUT
+    ;
+
+outputStmt
+    : OUTPUT
     ;
 
 NEWLINE: '\n' -> skip;
-COMMENT: '\\\\.*?\\\\' -> skip;
+COMMENT: '//' ~[\r\n]* '\r'? '\n'? -> channel(HIDDEN);
+WS: [ \r\n] -> skip;
+LOOPSTART: '[';
+LOOPEND:']';
+NUMBER: [0-9]+;
 INPUT: '?';
 OUTPUT: '.';
 DEC: '-';