Negation was missing (and still missing in java version)

subscripJS/lib/org/subato/script/parser/BuildTree.dart

@@ -50,8 +50,9 @@ class BuildTree extends SubatoScriptBaseVisitor<STree> {
           
         }
         return OneOf(es);
-
-      } else {
+      } else if (ctx.NOT() != null) {
+        return Negation(visit(ctx.expression(0)!)!);
+      }else {
         var result = visit(ctx.expression(0)!)!;
         if (ctx.relop() != null) {
           result = OpEx(result, (visit(ctx.relop()!)! as TOp).op, visit(ctx.expression(1)!)!);

subscripJS/lib/org/subato/script/tree/Eval.dart

@@ -72,6 +72,16 @@ class Eval implements Visitor<Val> {
     return r;
   }
 
+  @override
+  Val visitNegation(Negation il){
+    var l = il.expression.welcome(this);
+    if (l is BoolVal){
+      return BoolVal(!(l as BoolVal).b);
+    }else{
+      throw Exception("logical operator needs boolean values");
+    }
+  }
+
   @override
   Val visitUnaryOpEx(UnaryOpEx il) {
     var r = il.expression.welcome(this);
@@ -201,9 +211,10 @@ class Eval implements Visitor<Val> {
         var left = (l as BoolVal).b;
         var right = (r as BoolVal).b;
         return BoolVal(il.op == Op.AND?left && right:left||right);
+      }else{
+        throw Exception("logical operator needs boolean values");
       }
     }
-
     if (!(l.isNum() && r.isNum())) {
       throw Exception("arithmetic Operator needs numeric values");
     }

subscripJS/lib/org/subato/script/tree/Tree.dart

@@ -3,6 +3,7 @@ abstract class Visitor<R> {
   R visitIntNum(IntNum il);
   R visitDoubleNum(DoubleNum il);
   R visitVar(Var il);
+  R visitNegation(Negation il);
   R visitUnaryOpEx(UnaryOpEx il);
   R visitOpEx(OpEx il);
   R visitOneOf(OneOf il);
@@ -56,6 +57,16 @@ enum Op {
   EQEQ, NEQ, LT, LE, GT, GE, ADD, SUB, MUL, DIV, MOD, POW, AND, OR, NOT
 }
 
+class Negation implements STree{
+  STree expression;
+  Negation(this.expression);
+  @override
+  R welcome<R>(Visitor<R> v){
+    return v.visitNegation(this);
+  }
+}
+
+
 class UnaryOpEx implements STree{
   STree expression;
   bool isAdd = false;