libproc_macro: Implement Display for Group

Implement the Display trait on internal rust Group structure.

ChangeLog:

	* librust/proc_macro/rust/bridge/group.rs: Implement Display.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/librust/proc_macro/rust/bridge/group.rs b/librust/proc_macro/rust/bridge/group.rs
index 6590f89..5a68d87 100644
--- a/librust/proc_macro/rust/bridge/group.rs
+++ b/librust/proc_macro/rust/bridge/group.rs
@@ -1,4 +1,5 @@
 use bridge;
+use std::fmt;
 use Delimiter;
 
 #[repr(C)]
@@ -7,3 +8,24 @@ pub struct Group {
     delimiter: Delimiter,
     stream: bridge::token_stream::TokenStream,
 }
+impl fmt::Display for Group {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self.delimiter {
+            Delimiter::Parenthesis => f.write_str("(")?,
+            Delimiter::Brace => f.write_str("{")?,
+            Delimiter::Bracket => f.write_str("[")?,
+            Delimiter::None => (),
+        }
+
+        self.stream.fmt(f)?;
+
+        match self.delimiter {
+            Delimiter::Parenthesis => f.write_str(")")?,
+            Delimiter::Brace => f.write_str("}")?,
+            Delimiter::Bracket => f.write_str("]")?,
+            Delimiter::None => (),
+        }
+
+        Ok(())
+    }
+}