Parse till operators

src/grammars/mblf.pest

@@ -1 +1,15 @@
-alpha = { 'a'..'z' | 'A'..'Z' }
+operator = @{ "operator" } // TODO
+operand = @{ "operand" }  // TODO
+
+instruction = { operator ~ (" "+ ~ operand)*}
+
+loopBlockStart = {  "[" }
+loopBlockEnd = { "]" }
+loopBlock = { loopBlockStart
+            ~ instruction*
+            ~ loopBlockEnd
+}
+
+statement = _{ instruction | loopBlock }
+
+file = {SOI ~ (statement ~ ("\n" | "\r\n")+)* ~ EOI}