gh-106320: Remove _PyUnicode_TransformDecimalAndSpaceToASCII() (#106398)

Remove private _PyUnicode_TransformDecimalAndSpaceToASCII() and other
private _PyUnicode C API functions: move them to the internal C API
(pycore_unicodeobject.h). No longer most of these functions.

Replace _testcapi.unicode_transformdecimalandspacetoascii() with
_testinternal._PyUnicode_TransformDecimalAndSpaceToASCII().

6 files changed, 56 insertions, 50 deletions

diff --git a/Include/cpython/unicodeobject.h b/Include/cpython/unicodeobject.h
index dc8f643..e75b5e1 100644
--- a/Include/cpython/unicodeobject.h
+++ b/Include/cpython/unicodeobject.h
@@ -167,10 +167,6 @@ typedef struct {
     } data;                     /* Canonical, smallest-form Unicode buffer */
 } PyUnicodeObject;
 
-PyAPI_FUNC(int) _PyUnicode_CheckConsistency(
-    PyObject *op,
-    int check_content);
-
 
 #define _PyASCIIObject_CAST(op) \
     (assert(PyUnicode_Check(op)), \
@@ -461,19 +457,6 @@ PyAPI_FUNC(const char *) PyUnicode_AsUTF8(PyObject *unicode);
 
 #define _PyUnicode_AsString PyUnicode_AsUTF8
 
-/* --- Decimal Encoder ---------------------------------------------------- */
-
-/* Coverts a Unicode object holding a decimal value to an ASCII string
-   for using in int, float and complex parsers.
-   Transforms code points that have decimal digit property to the
-   corresponding ASCII digit code points.  Transforms spaces to ASCII.
-   Transforms code points starting from the first non-ASCII code point that
-   is neither a decimal digit nor a space to the end into '?'. */
-
-PyAPI_FUNC(PyObject*) _PyUnicode_TransformDecimalAndSpaceToASCII(
-    PyObject *unicode           /* Unicode object */
-    );
-
 /* === Characters Type APIs =============================================== */
 
 /* These should not be used directly. Use the Py_UNICODE_IS* and
@@ -623,23 +606,3 @@ static inline int Py_UNICODE_ISALNUM(Py_UCS4 ch) {
            || Py_UNICODE_ISDIGIT(ch)
            || Py_UNICODE_ISNUMERIC(ch));
 }
-
-
-/* === Misc functions ===================================================== */
-
-PyAPI_FUNC(PyObject*) _PyUnicode_FormatLong(PyObject *, int, int, int);
-
-/* Return an interned Unicode object for an Identifier; may fail if there is no memory.*/
-PyAPI_FUNC(PyObject*) _PyUnicode_FromId(_Py_Identifier*);
-
-/* Fast equality check when the inputs are known to be exact unicode types
-   and where the hash values are equal (i.e. a very probable match) */
-PyAPI_FUNC(int) _PyUnicode_EQ(PyObject *, PyObject *);
-
-/* Equality check. */
-PyAPI_FUNC(int) _PyUnicode_Equal(PyObject *, PyObject *);
-
-PyAPI_FUNC(int) _PyUnicode_WideCharString_Converter(PyObject *, void *);
-PyAPI_FUNC(int) _PyUnicode_WideCharString_Opt_Converter(PyObject *, void *);
-
-PyAPI_FUNC(Py_ssize_t) _PyUnicode_ScanIdentifier(PyObject *);
diff --git a/Include/internal/pycore_unicodeobject.h b/Include/internal/pycore_unicodeobject.h
index dd20ac1..ad59c3e 100644
--- a/Include/internal/pycore_unicodeobject.h
+++ b/Include/internal/pycore_unicodeobject.h
@@ -11,8 +11,12 @@ extern "C" {
 #include "pycore_fileutils.h"     // _Py_error_handler
 #include "pycore_ucnhash.h"       // _PyUnicode_Name_CAPI
 
-void _PyUnicode_ExactDealloc(PyObject *op);
-Py_ssize_t _PyUnicode_InternedSize(void);
+PyAPI_FUNC(int) _PyUnicode_CheckConsistency(
+    PyObject *op,
+    int check_content);
+
+extern void _PyUnicode_ExactDealloc(PyObject *op);
+extern Py_ssize_t _PyUnicode_InternedSize(void);
 
 /* Get a copy of a Unicode string. */
 PyAPI_FUNC(PyObject*) _PyUnicode_Copy(
@@ -277,6 +281,18 @@ extern PyObject* _PyUnicode_EncodeCharmap(
     PyObject *mapping,          /* encoding mapping */
     const char *errors);        /* error handling */
 
+/* --- Decimal Encoder ---------------------------------------------------- */
+
+/* Coverts a Unicode object holding a decimal value to an ASCII string
+   for using in int, float and complex parsers.
+   Transforms code points that have decimal digit property to the
+   corresponding ASCII digit code points.  Transforms spaces to ASCII.
+   Transforms code points starting from the first non-ASCII code point that
+   is neither a decimal digit nor a space to the end into '?'. */
+
+PyAPI_FUNC(PyObject*) _PyUnicode_TransformDecimalAndSpaceToASCII(
+    PyObject *unicode);         /* Unicode object */
+
 /* --- Methods & Slots ---------------------------------------------------- */
 
 extern PyObject* _PyUnicode_JoinArray(
@@ -323,6 +339,25 @@ extern Py_ssize_t _PyUnicode_InsertThousandsGrouping(
     PyObject *thousands_sep,
     Py_UCS4 *maxchar);
 
+/* --- Misc functions ----------------------------------------------------- */
+
+extern PyObject* _PyUnicode_FormatLong(PyObject *, int, int, int);
+
+/* Return an interned Unicode object for an Identifier; may fail if there is no memory.*/
+PyAPI_FUNC(PyObject*) _PyUnicode_FromId(_Py_Identifier*);
+
+/* Fast equality check when the inputs are known to be exact unicode types
+   and where the hash values are equal (i.e. a very probable match) */
+extern int _PyUnicode_EQ(PyObject *, PyObject *);
+
+/* Equality check. */
+PyAPI_FUNC(int) _PyUnicode_Equal(PyObject *, PyObject *);
+
+extern int _PyUnicode_WideCharString_Converter(PyObject *, void *);
+extern int _PyUnicode_WideCharString_Opt_Converter(PyObject *, void *);
+
+PyAPI_FUNC(Py_ssize_t) _PyUnicode_ScanIdentifier(PyObject *);
+
 /* --- Runtime lifecycle -------------------------------------------------- */
 
 extern void _PyUnicode_InitState(PyInterpreterState *);
diff --git a/Lib/test/test_capi/test_unicode.py b/Lib/test/test_capi/test_unicode.py
index ca91445..622ee89 100644
--- a/Lib/test/test_capi/test_unicode.py
+++ b/Lib/test/test_capi/test_unicode.py
@@ -7,6 +7,10 @@ try:
     import _testcapi
 except ImportError:
     _testcapi = None
+try:
+    import _testinternalcapi
+except ImportError:
+    _testinternalcapi = None
 
 
 NULL = None
@@ -913,10 +917,10 @@ class CAPITest(unittest.TestCase):
         self.assertEqual(getdefaultencoding(), b'utf-8')
 
     @support.cpython_only
-    @unittest.skipIf(_testcapi is None, 'need _testcapi module')
+    @unittest.skipIf(_testinternalcapi is None, 'need _testinternalcapi module')
     def test_transform_decimal_and_space(self):
         """Test _PyUnicode_TransformDecimalAndSpaceToASCII()"""
-        from _testcapi import unicode_transformdecimalandspacetoascii as transform_decimal
+        from _testinternalcapi import _PyUnicode_TransformDecimalAndSpaceToASCII as transform_decimal
 
         self.assertEqual(transform_decimal('123'),
                          '123')
diff --git a/Modules/_testcapi/unicode.c b/Modules/_testcapi/unicode.c
index 9c2760c..51d741a 100644
--- a/Modules/_testcapi/unicode.c
+++ b/Modules/_testcapi/unicode.c
@@ -660,14 +660,6 @@ unicode_getdefaultencoding(PyObject *self, PyObject *Py_UNUSED(ignored))
     return PyBytes_FromString(s);
 }
 
-/* Test _PyUnicode_TransformDecimalAndSpaceToASCII() */
-static PyObject *
-unicode_transformdecimalandspacetoascii(PyObject *self, PyObject *arg)
-{
-    NULLABLE(arg);
-    return _PyUnicode_TransformDecimalAndSpaceToASCII(arg);
-}
-
 /* Test PyUnicode_DecodeUTF8() */
 static PyObject *
 unicode_decodeutf8(PyObject *self, PyObject *args)
@@ -1544,7 +1536,6 @@ static PyMethodDef TestMethods[] = {
     {"unicode_decodeutf8",       unicode_decodeutf8,             METH_VARARGS},
     {"unicode_decodeutf8stateful",unicode_decodeutf8stateful,    METH_VARARGS},
     {"unicode_getdefaultencoding",unicode_getdefaultencoding,    METH_NOARGS},
-    {"unicode_transformdecimalandspacetoascii", unicode_transformdecimalandspacetoascii, METH_O},
     {"unicode_concat",           unicode_concat,                 METH_VARARGS},
     {"unicode_splitlines",       unicode_splitlines,             METH_VARARGS},
     {"unicode_split",            unicode_split,                  METH_VARARGS},
diff --git a/Modules/_testinternalcapi.c b/Modules/_testinternalcapi.c
index 4875ee7..14f91e8 100644
--- a/Modules/_testinternalcapi.c
+++ b/Modules/_testinternalcapi.c
@@ -1253,6 +1253,17 @@ test_tstate_capi(PyObject *self, PyObject *Py_UNUSED(args))
 }
 
 
+/* Test _PyUnicode_TransformDecimalAndSpaceToASCII() */
+static PyObject *
+unicode_transformdecimalandspacetoascii(PyObject *self, PyObject *arg)
+{
+    if (arg == Py_None) {
+        arg = NULL;
+    }
+    return _PyUnicode_TransformDecimalAndSpaceToASCII(arg);
+}
+
+
 static PyMethodDef module_functions[] = {
     {"get_configs", get_configs, METH_NOARGS},
     {"get_recursion_depth", get_recursion_depth, METH_NOARGS},
@@ -1304,6 +1315,7 @@ static PyMethodDef module_functions[] = {
     {"_PyTime_ObjectToTimeval",   test_pytime_object_to_timeval,  METH_VARARGS},
     {"_PyTraceMalloc_GetTraceback", tracemalloc_get_traceback, METH_VARARGS},
     {"test_tstate_capi", test_tstate_capi, METH_NOARGS, NULL},
+    {"_PyUnicode_TransformDecimalAndSpaceToASCII", unicode_transformdecimalandspacetoascii, METH_O},
     {NULL, NULL} /* sentinel */
 };
 
diff --git a/Python/pystrhex.c b/Python/pystrhex.c
index f798256..ce456b7 100644
--- a/Python/pystrhex.c
+++ b/Python/pystrhex.c
@@ -2,6 +2,7 @@
 
 #include "Python.h"
 #include "pycore_strhex.h"        // _Py_strhex_with_sep()
+#include "pycore_unicodeobject.h" // _PyUnicode_CheckConsistency()
 #include <stdlib.h>               // abs()
 
 static PyObject *_Py_strhex_impl(const char* argbuf, const Py_ssize_t arglen,