Parseur d'expression et affichage du résultat avec l'ASTPrinter en arborescence.

src/expr.rs

@@ -30,43 +30,43 @@ pub enum Expr {
 }
 
 pub trait ExprVisitor {
-    fn visit_binary(&self, b: &Binary);
-    fn visit_grouping(&self, g: &Grouping);
-    fn visit_literal(&self, l: &Literal);
-    fn visit_unary(&self, u: &Unary);
-    fn visit_expr(&self, e: &Expr);
+    fn visit_binary(&mut self, b: &Binary);
+    fn visit_grouping(&mut self, g: &Grouping);
+    fn visit_literal(&mut self, l: &Literal);
+    fn visit_unary(&mut self, u: &Unary);
+    fn visit_expr(&mut self, e: &Expr);
 }
 
 pub trait VisitableExpr {
-    fn accept(&self, visitor: &impl ExprVisitor);
+    fn accept(&self, visitor: &mut impl ExprVisitor);
 }
 
 impl VisitableExpr for Binary {
-    fn accept(&self, visitor: &impl ExprVisitor) {
+    fn accept(&self, visitor: &mut impl ExprVisitor) {
         visitor.visit_binary(self);
     }
 }
 
 impl VisitableExpr for Grouping {
-    fn accept(&self, visitor: &impl ExprVisitor) {
+    fn accept(&self, visitor: &mut impl ExprVisitor) {
         visitor.visit_grouping(self);
     }
 }
 
 impl VisitableExpr for Literal {
-    fn accept(&self, visitor: &impl ExprVisitor) {
+    fn accept(&self, visitor: &mut impl ExprVisitor) {
         visitor.visit_literal(self);
     }
 }
 
 impl VisitableExpr for Unary {
-    fn accept(&self, visitor: &impl ExprVisitor) {
+    fn accept(&self, visitor: &mut impl ExprVisitor) {
         visitor.visit_unary(self);
     }
 }
 
 impl VisitableExpr for Expr {
-    fn accept(&self, visitor: &impl ExprVisitor) {
+    fn accept(&self, visitor: &mut impl ExprVisitor) {
         visitor.visit_expr(self);
     }
 }