Escape backslashes in stub output (#208)

pybind11_stubgen/printer.py

@@ -122,7 +122,10 @@ def print_class_body(self, class_: Class) -> list[str]:
     def print_docstring(self, doc: Docstring) -> list[str]:
         return [
             '"""',
-            *(line.replace('"""', r"\"\"\"") for line in doc.splitlines()),
+            *(
+                line.replace("\\", r"\\").replace('"""', r"\"\"\"")
+                for line in doc.splitlines()
+            ),
             '"""',
         ]
 

tests/py-demo/bindings/src/modules/issues.cpp

@@ -22,6 +22,15 @@ void bind_issues_module(py::module &&m) {
                     "Tuning parameter (0 rad⁻¹ < zeta < 1 rad⁻¹) for which larger\n"
                     "values provide more damping in response."));
     }
+    {
+        m.def("backslashes_should_be_escaped", [] {}, R"docstring(
+            \brief A brief description of this function.
+
+            A detailed description of this function.
+
+            Here's some reStructuredText: :math:`x = [x, y, \theta]^T`
+        )docstring");
+    }
     {
         // https://github.com/sizmailov/pybind11-stubgen/issues/86
         auto cleanup_callback = []() { /* ... */ };

tests/stubs/python-3.12/pybind11-v2.11/numpy-array-wrap-with-annotated/demo/_bindings/issues.pyi

@@ -2,7 +2,20 @@ from __future__ import annotations
 
 import typing
 
-__all__ = ["issue_51_catastrophic_regex", "issue_73_utf8_doc_chars"]
+__all__ = [
+    "backslashes_should_be_escaped",
+    "issue_51_catastrophic_regex",
+    "issue_73_utf8_doc_chars",
+]
+
+def backslashes_should_be_escaped() -> None:
+    """
+    \\brief A brief description of this function.
+
+    A detailed description of this function.
+
+    Here's some reStructuredText: :math:`x = [x, y, \\theta]^T`
+    """
 
 def issue_51_catastrophic_regex(arg0: int, arg1: int) -> None:
     """

tests/stubs/python-3.12/pybind11-v2.9/numpy-array-wrap-with-annotated/demo/_bindings/issues.pyi

@@ -2,7 +2,20 @@ from __future__ import annotations
 
 import typing
 
-__all__ = ["issue_51_catastrophic_regex", "issue_73_utf8_doc_chars"]
+__all__ = [
+    "backslashes_should_be_escaped",
+    "issue_51_catastrophic_regex",
+    "issue_73_utf8_doc_chars",
+]
+
+def backslashes_should_be_escaped() -> None:
+    """
+    \\brief A brief description of this function.
+
+    A detailed description of this function.
+
+    Here's some reStructuredText: :math:`x = [x, y, \\theta]^T`
+    """
 
 def issue_51_catastrophic_regex(arg0: int, arg1: int) -> None:
     """