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]];

modules/Variables.py

@@ -49,19 +49,19 @@ class Variables:
         self.trace = trace
 
     def get(self, name):
-        assert name in self.variables, "la variable {name} n'éxiste pas"
+        assert name in self.variables, f"la variable {name} n'éxiste pas"
         if self.trace:
             print(f"{trace_format}accède {name}{reset_format}", file=sys.stderr)
         return self.variables[name].value
 
     def declare(self, typ, name, value=None):
-        assert name not in self.variables, "la variable {name} existe déjà"
+        assert name not in self.variables, f"la variable {name} existe déjà"
         self.variables[name] = self.Variable(typ, value)
         if self.trace:
             print(f"{trace_format}déclare {name} = {value}{reset_format}", file=sys.stderr)
 
     def assign(self, name, value):
-        assert name in self.variables, "la variable n'éxiste pas"
+        assert name in self.variables, f"la variable n'éxiste pas"
         self.variables[name].set(value)
         if self.trace:
             print(f"{trace_format}modifie {name} = {value}{reset_format}", file=sys.stderr)

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

@@ -111,7 +111,7 @@ class SPFInterpreter(lark.visitors.Interpreter):
 
     def list_get(self, el):
         (left, right) = self.visit_children(el)
-        return left[right]
+        return left[right-1]
 
 
     def expression(self, el):
@@ -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()