🐐 NON operator

centvrion/ast_nodes.py

@@ -462,6 +462,24 @@ class UnaryMinus(Node):
     return vtable, ValInt(-val.value())
 
 
+class UnaryNot(Node):
+  def __init__(self, expr):
+    self.expr = expr
+
+  def __eq__(self, other):
+    return type(self) == type(other) and self.expr == other.expr
+
+  def __repr__(self):
+    return f"UnaryNot({self.expr!r})"
+
+  def print(self):
+    return f"(NON {self.expr.print()})"
+
+  def _eval(self, vtable):
+    vtable, val = self.expr.eval(vtable)
+    return vtable, ValBool(not bool(val))
+
+
 class ArrayIndex(Node):
   def __init__(self, array, index) -> None:
     self.array = array

centvrion/lexer.py

@@ -17,6 +17,7 @@ keyword_tokens = [("KEYWORD_"+i, i) for i in [
   "INVOCA",
   "IN",
   "MINVS",
+  "NON",
   "NVLLVS",
   "PER",
   "PLVS",

centvrion/parser.py

@@ -15,7 +15,7 @@ class Parser():
         ('left', ["KEYWORD_PLVS", "KEYWORD_MINVS", "KEYWORD_EST"]),
         ('left', ["SYMBOL_COLON", "SYMBOL_PLUS", "SYMBOL_MINUS"]),
         ('left', ["SYMBOL_TIMES", "SYMBOL_DIVIDE"]),
-        ('right', ["UMINUS"]),
+        ('right', ["UMINUS", "UNOT"]),
         ('left', ["INDEX"]),
       ]
     )
@@ -191,6 +191,10 @@ class Parser():
     def unary_minus(tokens):
       return ast_nodes.UnaryMinus(tokens[1])
 
+    @self.pg.production('expression : KEYWORD_NON expression', precedence='UNOT')
+    def unary_not(tokens):
+      return ast_nodes.UnaryNot(tokens[1])
+
     @self.pg.production('expression : KEYWORD_INVOCA id expressions')
     def invoca(tokens):
       return ast_nodes.Invoca(tokens[1], tokens[2])