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* [gcc/devel/rust/master] libproc_macro: Implement Display for TokenStream
@ 2023-04-06 21:31 Thomas Schwinge
0 siblings, 0 replies; only message in thread
From: Thomas Schwinge @ 2023-04-06 21:31 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:3762177c58e4780f16f6eaf8dd237d8e50fa9c94
commit 3762177c58e4780f16f6eaf8dd237d8e50fa9c94
Author: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>
Date: Mon Feb 20 16:01:55 2023 +0100
libproc_macro: Implement Display for TokenStream
Implement the Display trait for the external rust structure TokenStream.
ChangeLog:
* librust/proc_macro/rust/bridge/token_stream.rs: Add internal
TokenStream Display implementation.
* librust/proc_macro/rust/lib.rs: Add external Display
implementation for TokenStream.
Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>
Diff:
---
librust/proc_macro/rust/bridge/token_stream.rs | 26 ++++++++++++++++++++++++++
librust/proc_macro/rust/lib.rs | 4 ++--
2 files changed, 28 insertions(+), 2 deletions(-)
diff --git a/librust/proc_macro/rust/bridge/token_stream.rs b/librust/proc_macro/rust/bridge/token_stream.rs
index 027f450b826..2ddde8ed0b6 100644
--- a/librust/proc_macro/rust/bridge/token_stream.rs
+++ b/librust/proc_macro/rust/bridge/token_stream.rs
@@ -1,5 +1,7 @@
use bridge::{group::Group, ident::Ident, literal::Literal, punct::Punct};
use std::convert::TryInto;
+use std::fmt;
+use std::slice;
type ExternalTokenTree = crate::TokenTree;
type ExternalTokenStream = crate::TokenStream;
@@ -17,6 +19,17 @@ pub enum TokenTree {
Literal(Literal),
}
+impl fmt::Display for TokenTree {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ match self {
+ TokenTree::Group(group) => group.fmt(f),
+ TokenTree::Ident(ident) => ident.fmt(f),
+ TokenTree::Punct(punct) => punct.fmt(f),
+ TokenTree::Literal(literal) => literal.fmt(f),
+ }
+ }
+}
+
impl From<ExternalTokenTree> for TokenTree {
fn from(value: ExternalTokenTree) -> Self {
match value {
@@ -103,3 +116,16 @@ impl Extend<ExternalTokenStream> for TokenStream {
}
}
}
+
+impl fmt::Display for TokenStream {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ for i in unsafe { slice::from_raw_parts(self.data, self.size.try_into().unwrap()) } {
+ i.fmt(f)?;
+ match i {
+ TokenTree::Punct(_) => (),
+ _ => f.write_str(" ")?,
+ }
+ }
+ Ok(())
+ }
+}
diff --git a/librust/proc_macro/rust/lib.rs b/librust/proc_macro/rust/lib.rs
index 13f66f04fac..aa90a51db54 100644
--- a/librust/proc_macro/rust/lib.rs
+++ b/librust/proc_macro/rust/lib.rs
@@ -154,8 +154,8 @@ impl TokenStream {
}
impl fmt::Display for TokenStream {
- fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
- todo!("Implement this function")
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ self.0.fmt(f)
}
}
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