fix: 8405 pattern serialization

src/serializers/infer.rs

@@ -219,6 +219,7 @@ pub(crate) fn infer_to_python_known(
                 PyList::new(py, items).into_py(py)
             }
             ObType::Path => value.str()?.into_py(py),
+            ObType::Pattern => value.getattr(intern!(py, "pattern"))?.into_py(py),
             ObType::Unknown => {
                 if let Some(fallback) = extra.fallback {
                     let next_value = fallback.call1((value,))?;
@@ -505,6 +506,16 @@ pub(crate) fn infer_serialize_known<S: Serializer>(
             let s = value.str().map_err(py_err_se_err)?.to_str().map_err(py_err_se_err)?;
             serializer.serialize_str(s)
         }
+        ObType::Pattern => {
+            let s = value
+                .getattr(intern!(value.py(), "pattern"))
+                .map_err(py_err_se_err)?
+                .str()
+                .map_err(py_err_se_err)?
+                .to_str()
+                .map_err(py_err_se_err)?;
+            serializer.serialize_str(s)
+        }
         ObType::Unknown => {
             if let Some(fallback) = extra.fallback {
                 let next_value = fallback.call1((value,)).map_err(py_err_se_err)?;
@@ -628,6 +639,7 @@ pub(crate) fn infer_json_key_known<'py>(ob_type: ObType, key: &'py PyAny, extra:
             infer_json_key(k, extra)
         }
         ObType::Path => Ok(key.str()?.to_string_lossy()),
+        ObType::Pattern => Ok(key.getattr(intern!(key.py(), "pattern"))?.str()?.to_string_lossy()),
         ObType::Unknown => {
             if let Some(fallback) = extra.fallback {
                 let next_key = fallback.call1((key,))?;

src/serializers/ob_type.rs

@@ -44,6 +44,8 @@ pub struct ObTypeLookup {
     generator_object: PyObject,
     // path
     path_object: PyObject,
+    // pattern
+    pattern_object: PyObject,
     // uuid type
     uuid_object: PyObject,
 }
@@ -87,6 +89,7 @@ impl ObTypeLookup {
                 .unwrap()
                 .to_object(py),
             path_object: py.import("pathlib").unwrap().getattr("Path").unwrap().to_object(py),
+            pattern_object: py.import("re").unwrap().getattr("Pattern").unwrap().to_object(py),
             uuid_object: py.import("uuid").unwrap().getattr("UUID").unwrap().to_object(py),
         }
     }
@@ -150,6 +153,7 @@ impl ObTypeLookup {
             ObType::Enum => self.enum_object.as_ptr() as usize == ob_type,
             ObType::Generator => self.generator_object.as_ptr() as usize == ob_type,
             ObType::Path => self.path_object.as_ptr() as usize == ob_type,
+            ObType::Pattern => self.path_object.as_ptr() as usize == ob_type,
             ObType::Uuid => self.uuid_object.as_ptr() as usize == ob_type,
             ObType::Unknown => false,
         };
@@ -242,6 +246,8 @@ impl ObTypeLookup {
             ObType::Generator
         } else if ob_type == self.path_object.as_ptr() as usize {
             ObType::Path
+        } else if ob_type == self.pattern_object.as_ptr() as usize {
+            ObType::Pattern
         } else {
             // this allows for subtypes of the supported class types,
             // if `ob_type` didn't match any member of self, we try again with the next base type pointer
@@ -319,6 +325,8 @@ impl ObTypeLookup {
             ObType::Generator
         } else if value.is_instance(self.path_object.as_ref(py)).unwrap_or(false) {
             ObType::Path
+        } else if value.is_instance(self.pattern_object.as_ref(py)).unwrap_or(false) {
+            ObType::Pattern
         } else {
             ObType::Unknown
         }
@@ -396,6 +404,8 @@ pub enum ObType {
     Generator,
     // Path
     Path,
+    //Pattern,
+    Pattern,
     // Uuid
     Uuid,
     // unknown type

tests/serializers/test_any.py

@@ -1,6 +1,7 @@
 import dataclasses
 import json
 import platform
+import re
 import sys
 from collections import namedtuple
 from datetime import date, datetime, time, timedelta, timezone
@@ -437,7 +438,7 @@ def test_base64():
         (lambda: MyEnum.a, {}, b'1'),
         (lambda: MyEnum.b, {}, b'"b"'),
         (lambda: [MyDataclass(1, 'a', 2), MyModel(a=2, b='b')], {}, b'[{"a":1,"b":"a"},{"a":2,"b":"b"}]'),
-        # # (lambda: re.compile('^regex$'), b'"^regex$"'),
+        (lambda: re.compile('^regex$'), {}, b'"^regex$"'),
     ],
 )
 def test_encoding(any_serializer, gen_input, kwargs, expected_json):