Ajout des If, des opérateurs logiques et des boucles While

src/expr.rs

@@ -37,11 +37,19 @@ pub struct Variable {
     pub name: Token,
 }
 
+#[derive(Clone)]
+pub struct Logical {
+    pub left: Box<Expr>,
+    pub operator: Token,
+    pub right: Box<Expr>,
+}
+
 #[derive(Clone)]
 pub enum Expr {
     BinaryExpr(Binary),
     GroupingExpr(Grouping),
     LiteralExpr(Literal),
+    LogicalExpr(Logical),
     UnaryExpr(Unary),
     VariableExpr(Variable),
     AssignExpr(Assign),
@@ -55,5 +63,6 @@ pub trait ExprVisitor<T> {
     fn visit_expr(&mut self, e: &Expr) -> T;
     fn visit_variable(&mut self, v: &Variable) -> T;
     fn visit_assign(&mut self, a: &Assign) -> T;
+    fn visit_logical(&mut self, l: &Logical) -> T;
 }