macros: fix raw-ident pyclasses having r# at the start of the Python name

CHANGELOG.md

@@ -27,6 +27,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Fixed incorrectly disabled FFI definition `PyThreadState_DeleteCurrent`. [#2357](https://github.com/PyO3/pyo3/pull/2357)
 - Correct FFI definition `PyEval_EvalCodeEx` to take `*const *mut PyObject` array arguments instead of `*mut *mut PyObject` (this was changed in CPython 3.6). [#2368](https://github.com/PyO3/pyo3/pull/2368)
+- Fix "raw-ident" structs (e.g. `#[pyclass] struct r#RawName`) incorrectly having `r#` at the start of the class name created in Python. [#2395](https://github.com/PyO3/pyo3/pull/2395)
 
 ## [0.16.5] - 2022-05-15
 

pyo3-macros-backend/src/method.rs

@@ -1,5 +1,7 @@
 // Copyright (c) 2017-present PyO3 Project and Contributors
 
+use std::borrow::Cow;
+
 use crate::attributes::TextSignatureAttribute;
 use crate::deprecations::Deprecation;
 use crate::params::{accept_args_kwargs, impl_arg_params};
@@ -287,7 +289,9 @@ impl<'a> FnSpec<'a> {
 
         let doc = utils::get_doc(
             meth_attrs,
-            text_signature.as_ref().map(|attr| (&python_name, attr)),
+            text_signature
+                .as_ref()
+                .map(|attr| (Cow::Borrowed(&python_name), attr)),
         );
 
         let arguments: Vec<_> = if skip_first_arg {

pyo3-macros-backend/src/pyclass.rs

@@ -1,5 +1,7 @@
 // Copyright (c) 2017-present PyO3 Project and Contributors
 
+use std::borrow::Cow;
+
 use crate::attributes::{
     self, kw, take_pyo3_options, CrateAttribute, ExtendsAttribute, FreelistAttribute,
     ModuleAttribute, NameAttribute, NameLitStr, TextSignatureAttribute,
@@ -282,12 +284,12 @@ impl FieldPyO3Options {
     }
 }
 
-fn get_class_python_name<'a>(cls: &'a syn::Ident, args: &'a PyClassArgs) -> &'a syn::Ident {
+fn get_class_python_name<'a>(cls: &'a syn::Ident, args: &'a PyClassArgs) -> Cow<'a, syn::Ident> {
     args.options
         .name
         .as_ref()
-        .map(|name_attr| &name_attr.value.0)
-        .unwrap_or(cls)
+        .map(|name_attr| Cow::Borrowed(&name_attr.value.0))
+        .unwrap_or_else(|| Cow::Owned(cls.unraw()))
 }
 
 fn impl_class(

pyo3-macros-backend/src/pyfunction.rs

@@ -1,5 +1,7 @@
 // Copyright (c) 2017-present PyO3 Project and Contributors
 
+use std::borrow::Cow;
+
 use crate::{
     attributes::{
         self, get_pyo3_options, take_attributes, take_pyo3_options, CrateAttribute,
@@ -408,7 +410,7 @@ pub fn impl_wrap_pyfunction(
         options
             .text_signature
             .as_ref()
-            .map(|attr| (&python_name, attr)),
+            .map(|attr| (Cow::Borrowed(&python_name), attr)),
     );
 
     let krate = get_pyo3_crate(&options.krate);

pyo3-macros-backend/src/utils.rs

@@ -1,7 +1,9 @@
+use std::borrow::Cow;
+
 // Copyright (c) 2017-present PyO3 Project and Contributors
 use proc_macro2::{Span, TokenStream};
 use quote::ToTokens;
-use syn::spanned::Spanned;
+use syn::{spanned::Spanned, Ident};
 
 use crate::attributes::{CrateAttribute, TextSignatureAttribute};
 
@@ -66,7 +68,7 @@ pub struct PythonDoc(TokenStream);
 /// e.g. concat!("...", "\n", "\0")
 pub fn get_doc(
     attrs: &[syn::Attribute],
-    text_signature: Option<(&syn::Ident, &TextSignatureAttribute)>,
+    text_signature: Option<(Cow<'_, Ident>, &TextSignatureAttribute)>,
 ) -> PythonDoc {
     let mut tokens = TokenStream::new();
     let comma = syn::token::Comma(Span::call_site());

tests/test_methods.rs

@@ -902,6 +902,7 @@ impl r#RawIdents {
 fn test_raw_idents() {
     Python::with_gil(|py| {
         let raw_idents_type = py.get_type::<r#RawIdents>();
+        assert_eq!(raw_idents_type.name().unwrap(), "RawIdents");
         py_run!(
             py,
             raw_idents_type,