From 92965a7b9d5cd9db35b52e60cdc3962a2d9cf947 Mon Sep 17 00:00:00 2001
From: littleblack111 <littleblack11111@gmail.com>
Date: Wed, 8 Oct 2025 16:30:01 +0800
Subject: ast: impl Display for DepthExpr

---
 src/ast.rs | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/ast.rs b/src/ast.rs
index fb648e0..d9aa699 100644
--- a/src/ast.rs
+++ b/src/ast.rs
@@ -1,5 +1,5 @@
 use crate::tokenizer::If;
-use std::iter::Peekable;
+use std::{fmt::Display, iter::Peekable};
 
 use crate::parser::{Expr, ExprT, Metadata, Scope};
 
@@ -15,6 +15,20 @@ pub enum DepthExpr<'a> {
     Process(&'a str),
 }
 
+impl<'a> Display for DepthExpr<'a> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "{}",
+            match self {
+                DepthExpr::IO(s) => s.to_string(),
+                DepthExpr::Process(s) => s.to_string(),
+                _ => panic!("Cannot convert complex field to string"),
+            }
+        )
+    }
+}
+
 pub fn parse<'a>(vec: &Vec<Expr<'a>>) -> Vec<DepthExpr<'a>> {
     let mut exprs: Vec<DepthExpr<'a>> = Vec::new();
 
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