add more rules tu parser grammar and write more tests for new rules

grammar.y

@@ -1,4 +1,9 @@
 class Query
+    prechigh
+        left OPERATOR_NOT
+        left OPERATOR_AND
+        left OPERATOR_OR
+      preclow
     rule
         target: expression
                 | /* none */ { result = 0 }
@@ -7,6 +12,9 @@ class Query
           |     TERM_WITH_QUOTES                                                { result = {:DEFAULT_COLUMN => val[0]} }
           |     TERM_WITHOUT_QUOTES COLON TERM_WITHOUT_QUOTES                   { result = {val[0] => val[2]} }
           |     TERM_WITHOUT_QUOTES COLON TERM_WITH_QUOTES                      { result = {val[0] => val[2]} }
+          |     expression OPERATOR_OR expression                               { result = {:OPERATOR_OR => [val[0], val[2]]} }
+          |     expression OPERATOR_AND expression                              { result = {:OPERATOR_AND => [val[0], val[2]]} }
+          |     L_BRACKET expression R_BRACKET                                  { result = val[1] }
 end
 
 ---- header