REF: make ccalendar self-contained (#35119)

Author: jbrockmendel

pandas/_libs/tslibs/ccalendar.pyx

@@ -7,11 +7,6 @@ import cython
 
 from numpy cimport int64_t, int32_t
 
-from locale import LC_TIME
-
-from pandas._config.localization import set_locale
-from pandas._libs.tslibs.strptime import LocaleTime
-
 # ----------------------------------------------------------------------
 # Constants
 
@@ -246,21 +241,3 @@ cpdef int32_t get_day_of_year(int year, int month, int day) nogil:
 
     day_of_year = mo_off + day
     return day_of_year
-
-
-def get_locale_names(name_type: str, locale: object = None):
-    """
-    Returns an array of localized day or month names.
-
-    Parameters
-    ----------
-    name_type : string, attribute of LocaleTime() in which to return localized
-        names
-    locale : string
-
-    Returns
-    -------
-    list of locale names
-    """
-    with set_locale(locale, LC_TIME):
-        return getattr(LocaleTime(), name_type)

pandas/_libs/tslibs/fields.pyx

@@ -2,6 +2,7 @@
 Functions for accessing attributes of Timestamp/datetime64/datetime-like
 objects and arrays
 """
+from locale import LC_TIME
 
 import cython
 from cython import Py_ssize_t
@@ -11,9 +12,9 @@ cimport numpy as cnp
 from numpy cimport ndarray, int64_t, int32_t, int8_t, uint32_t
 cnp.import_array()
 
-from pandas._libs.tslibs.ccalendar import (
-    get_locale_names, MONTHS_FULL, DAYS_FULL,
-)
+from pandas._config.localization import set_locale
+
+from pandas._libs.tslibs.ccalendar import MONTHS_FULL, DAYS_FULL
 from pandas._libs.tslibs.ccalendar cimport (
     DAY_NANOS,
     get_days_in_month, is_leapyear, dayofweek, get_week_of_year,
@@ -24,6 +25,7 @@ from pandas._libs.tslibs.np_datetime cimport (
     npy_datetimestruct, pandas_timedeltastruct, dt64_to_dtstruct,
     td64_to_tdstruct)
 from pandas._libs.tslibs.nattype cimport NPY_NAT
+from pandas._libs.tslibs.strptime import LocaleTime
 
 
 def get_time_micros(const int64_t[:] dtindex):
@@ -704,3 +706,21 @@ def build_isocalendar_sarray(const int64_t[:] dtindex):
             iso_weeks[i] = ret_val[1]
             days[i] = ret_val[2]
     return out
+
+
+def get_locale_names(name_type: str, locale: object = None):
+    """
+    Returns an array of localized day or month names.
+
+    Parameters
+    ----------
+    name_type : string, attribute of LocaleTime() in which to return localized
+        names
+    locale : string
+
+    Returns
+    -------
+    list of locale names
+    """
+    with set_locale(locale, LC_TIME):
+        return getattr(LocaleTime(), name_type)