[client] exeute command

client/bf.g4

@@ -0,0 +1,49 @@
+grammar bf;
+
+program
+    : statements EOF;
+
+statements
+    : eligibleStmt*;
+
+eligibleStmt
+    : stmt
+    | numberedStmt
+    ;
+
+numberedStmt
+    : stmt NUMBER
+    ;
+
+stmt
+    : basicStmt
+    | loopStmt
+    ;
+
+
+loopStmt
+    : LOOPSTART statements LOOPEND 
+    ;
+
+basicStmt 
+    : INC # ptrIncr
+    | DEC # ptrDecr
+    | LEFT # ptrLeft
+    | RIGHT # ptrRight
+    | INPUT # inputStmt
+    | OUTPUT # outputStmt
+    ;
+
+
+LOOPSTART: '[';
+LOOPEND:']';
+NUMBER: [0-9]+;
+INPUT: ',';
+OUTPUT: '.';
+DEC: '-';
+INC: '+';
+LEFT: '<';
+RIGHT: '>';
+EVERYTHING_ELSE: . ->channel(HIDDEN);
+WS: [ \r\n] -> skip;
+