Adding range

examples/lists.spf

@@ -0,0 +1,9 @@
+liste premier = [1, 2, 3];
+
+ajouter 4 dans premier;
+
+liste deuxieme = [1:4];
+
+liste troisième = [deuxieme[0]: 10];
+
+liste quatrième = [1: troisième[6]];

spf.lark

@@ -55,7 +55,7 @@ loop: "tant" "que" expression "faire" "{" instruction_seq "}" -> while_loop
 
 list: "[" expression? ("," expression)* "]" 
 
-range: "[" expression? ":" expression? "]"
+range: "[" expression ":" expression "]"
 
 controls: test
 		| loop

spf.py

@@ -136,6 +136,10 @@ class SPFInterpreter(lark.visitors.Interpreter):
     true = lambda self, _: True
     false = lambda self, _: False
 
+    def range(self, el):
+        (left, right) = self.visit_children(el)
+        return list(range(left, right+1))
+
     def dump(self):
         self.variables.dump()