Finalisation de l'interpreteur d'expressions.

src/expr.rs

@@ -10,6 +10,7 @@ pub struct Grouping {
     pub expression: Box<Expr>,
 }
 
+#[derive(Clone)]
 pub enum Literal {
     LiteralNumber(f64),
     LiteralString(String),
@@ -29,44 +30,11 @@ pub enum Expr {
     UnaryExpr(Unary),
 }
 
-pub trait ExprVisitor {
-    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 ExprVisitor<T> {
+    fn visit_binary(&mut self, b: &Binary) -> T;
+    fn visit_grouping(&mut self, g: &Grouping) -> T;
+    fn visit_literal(&mut self, l: &Literal) ->T;
+    fn visit_unary(&mut self, u: &Unary) -> T;
+    fn visit_expr(&mut self, e: &Expr) -> T;
 }
 
-pub trait VisitableExpr {
-    fn accept(&self, visitor: &mut impl ExprVisitor);
-}
-
-impl VisitableExpr for Binary {
-    fn accept(&self, visitor: &mut impl ExprVisitor) {
-        visitor.visit_binary(self);
-    }
-}
-
-impl VisitableExpr for Grouping {
-    fn accept(&self, visitor: &mut impl ExprVisitor) {
-        visitor.visit_grouping(self);
-    }
-}
-
-impl VisitableExpr for Literal {
-    fn accept(&self, visitor: &mut impl ExprVisitor) {
-        visitor.visit_literal(self);
-    }
-}
-
-impl VisitableExpr for Unary {
-    fn accept(&self, visitor: &mut impl ExprVisitor) {
-        visitor.visit_unary(self);
-    }
-}
-
-impl VisitableExpr for Expr {
-    fn accept(&self, visitor: &mut impl ExprVisitor) {
-        visitor.visit_expr(self);
-    }
-}