From 257f31276f50556845183fff4fc93e54b0c7e533 Mon Sep 17 00:00:00 2001
From: Emmanuel BERNAT <manu@bernat.me>
Date: Tue, 30 Apr 2024 08:29:16 +0200
Subject: [PATCH] =?UTF-8?q?Mise=20en=20place=20du=20visiteur=20et=20=C3=A9?=
 =?UTF-8?q?bauche=20de=20pretty=20printer.?=
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---
 src/expr.rs | 62 ++++++++++++++++++++++++++++++++++++++++++++++-------
 src/main.rs |  3 ++-
 2 files changed, 56 insertions(+), 9 deletions(-)

diff --git a/src/expr.rs b/src/expr.rs
index 47143b9..65b80c1 100644
--- a/src/expr.rs
+++ b/src/expr.rs
@@ -1,13 +1,13 @@
 use crate::token::Token;
 
 pub struct Binary {
-    left: Expr,
+    left: Box<Expr>,
     operator: Token,
-    right: Expr,
+    right: Box<Expr>,
 }
 
 pub struct Grouping {
-    expression: Expr,
+    expression: Box<Expr>,
 }
 
 pub enum Literal {
@@ -19,12 +19,58 @@ pub enum Literal {
 
 pub struct Unary {
     operator: Token,
-    right: Expr,
+    right: Box<Expr>,
 }
 
 pub enum Expr {
-    Binary ,
-    Grouping,
-    Literal,
-    Unary,
+    BinaryExpr(Binary),
+    GroupingExpr(Grouping),
+    LiteralExpr(Literal),
+    UnaryExpr(Unary),
+}
+
+pub trait Visitor {
+    fn visit(&self);
+}
+
+impl Visitor for Binary {
+    fn visit(&self) {
+        print!("( {}",&self.operator.literal);
+        &self.left.visit();
+        &self.right.visit();
+        print!(")");
+    }
+}
+
+impl Visitor for Grouping {
+    fn visit(&self) {
+        print!("( group ");
+        &self.expression.visit();
+        print!(")");
+    }
+}
+
+impl Visitor for Literal {
+    fn visit(&self) {
+        match &self {
+            Literal::LiteralNumber(i) => print!("{}", i),
+            Literal::LiteralString(s) => print!("{}", s),
+            Literal::LiteralBool(b) => print!("{}", b),
+            Literal::LiteralNil => print!("nil"),
+        }
+    }
+}
+
+impl Visitor for Unary {
+    fn visit(&self) {
+        print!("( {}",&self.operator.literal);
+        &self.right.visit();
+        print!(")");
+    }
+}
+
+impl Visitor for Expr {
+    fn visit(&self) {
+        &self.visit();
+    }
 }
diff --git a/src/main.rs b/src/main.rs
index 398de11..b97d31f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,6 @@
 use std::env;
-//use std::io::Write;
 use std::process;
+use crate::expr::Expr;
 
 mod rlox_interpreter;
 mod scanner;
@@ -31,6 +31,7 @@ fn main() {
 }
 
 
+
 // Implémentations de référence :
 // https://github.com/munificent/craftinginterpreters/wiki/Lox-implementations#rust