Added support for parentheses around expressions as per #72

src/main/java/me/legrange/mikrotik/impl/Parser.java

@@ -79,7 +79,7 @@ class Parser {
     }
 
     private void expr() throws ParseException {
-        expect(Token.NOT, Token.TEXT);
+        expect(Token.NOT, Token.TEXT, Token.LEFT_BRACKET);
         switch (token) {
             case NOT:
                 notExpr();
@@ -106,6 +106,13 @@ class Parser {
                 }
             }
             break;
+            case LEFT_BRACKET : {
+                next();
+                expr();
+                expect(Token.RIGHT_BRACKET);
+                next();
+            }
+            break;
         }
         // if you get here, you had a expression, see if you want more. 
         switch (token) {

src/main/java/me/legrange/mikrotik/impl/Scanner.java

@@ -28,6 +28,7 @@ class Scanner {
 
         SLASH("/"), COMMA(","), EOL(), WS, TEXT,
         LESS("<"), MORE(">"), EQUALS("="), NOT_EQUALS("!="), PIPE("!"),
+        LEFT_BRACKET("("), RIGHT_BRACKET(")"),
         WHERE, NOT, AND, OR, RETURN;
 
         @Override
@@ -80,6 +81,12 @@ class Scanner {
             case '=':
                 nextChar();
                 return EQUALS;
+            case '(' :
+                nextChar();
+                return LEFT_BRACKET;
+            case ')' :
+                nextChar();
+                return RIGHT_BRACKET;
             case '!':
                 return pipe();
             case '"':