From 911775b73159ee0580950ec81a6ac40401694774 Mon Sep 17 00:00:00 2001
From: Domenic Quirl <DomenicQuirl@pm.me>
Date: Thu, 14 Jan 2021 15:08:09 +0100
Subject: [PATCH] add debug implementations for nodes/tokens with resolver

---
 src/syntax.rs  | 38 +++++++++++++++++++++++++++++++++++++-
 tests/basic.rs | 12 ++++++++++++
 2 files changed, 49 insertions(+), 1 deletion(-)

diff --git a/src/syntax.rs b/src/syntax.rs
index c25e14a..0e93588 100644
--- a/src/syntax.rs
+++ b/src/syntax.rs
@@ -1,6 +1,6 @@
 use std::{
     cell::UnsafeCell,
-    fmt::Write,
+    fmt::{self, Write},
     hash::{Hash, Hasher},
     iter, ptr,
     sync::atomic::{AtomicU32, Ordering},
@@ -872,6 +872,24 @@ where
     }
 }
 
+impl<L: Language, D, R> fmt::Debug for SyntaxNode<L, D, R>
+where
+    R: Resolver,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", Self::debug(self, self.resolver().as_ref(), f.alternate()))
+    }
+}
+
+impl<L: Language, D, R> fmt::Display for SyntaxNode<L, D, R>
+where
+    R: Resolver,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", Self::display(self, self.resolver().as_ref()))
+    }
+}
+
 impl<L: Language, D, R> SyntaxToken<L, D, R> {
     fn new(parent: &SyntaxNode<L, D, R>, index: u32, offset: TextSize) -> SyntaxToken<L, D, R> {
         Self {
@@ -1000,6 +1018,24 @@ where
     }
 }
 
+impl<L: Language, D, R> fmt::Debug for SyntaxToken<L, D, R>
+where
+    R: Resolver,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", Self::debug(self, self.parent().resolver().as_ref()))
+    }
+}
+
+impl<L: Language, D, R> fmt::Display for SyntaxToken<L, D, R>
+where
+    R: Resolver,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", Self::display(self, self.parent().resolver().as_ref()))
+    }
+}
+
 impl<L: Language, D, R> SyntaxElement<L, D, R> {
     fn new(
         element: GreenElementRef<'_>,
diff --git a/tests/basic.rs b/tests/basic.rs
index cd950d0..54ea9f5 100644
--- a/tests/basic.rs
+++ b/tests/basic.rs
@@ -147,11 +147,23 @@ fn inline_resolver() {
         let leaf1_0 = leaf1_0.into_token().unwrap();
         assert_eq!(leaf1_0.text(), "1.0");
         assert_eq!(leaf1_0.text_range(), TextRange::at(6.into(), 3.into()));
+        assert_eq!(format!("{}", leaf1_0), leaf1_0.text());
+        assert_eq!(format!("{:?}", leaf1_0), "SyntaxKind(5)@6..9 \"1.0\"");
     }
     {
         let node2 = tree.children().nth(2).unwrap();
         assert_eq!(node2.text(), "2.02.12.2");
         let resolver = node2.resolver();
         assert_eq!(node2.resolve_text(resolver.as_ref()), node2.text());
+        assert_eq!(format!("{}", node2).as_str(), node2.text());
+        assert_eq!(format!("{:?}", node2), "SyntaxKind(6)@9..18");
+        assert_eq!(
+            format!("{:#?}", node2),
+            r#"SyntaxKind(6)@9..18
+  SyntaxKind(7)@9..12 "2.0"
+  SyntaxKind(8)@12..15 "2.1"
+  SyntaxKind(9)@15..18 "2.2"
+"#
+        );
     }
 }