gh-139353: Rename formatter_unicode.c to unicode_formatter.c (#139723)

* Move Python/formatter_unicode.c to Objects/unicode_formatter.c.
* Move Objects/stringlib/localeutil.h content into
  unicode_formatter.c. Remove localeutil.h.
* Move _PyUnicode_InsertThousandsGrouping() to unicode_formatter.c
  and mark the function as static.
* Rename unicode_fill() to _PyUnicode_Fill() and export it in
  pycore_unicodeobject.h.
* Move MAX_UNICODE to pycore_unicodeobject.h as _Py_MAX_UNICODE.

Author: vstinner

Include/internal/pycore_unicodeobject.h

@@ -11,6 +11,44 @@ extern "C" {
 #include "pycore_fileutils.h"     // _Py_error_handler
 #include "pycore_ucnhash.h"       // _PyUnicode_Name_CAPI
 
+// Maximum code point of Unicode 6.0: 0x10ffff (1,114,111).
+#define _Py_MAX_UNICODE 0x10ffff
+
+
+static inline void
+_PyUnicode_Fill(int kind, void *data, Py_UCS4 value,
+                Py_ssize_t start, Py_ssize_t length)
+{
+    assert(0 <= start);
+    switch (kind) {
+    case PyUnicode_1BYTE_KIND: {
+        assert(value <= 0xff);
+        Py_UCS1 ch = (unsigned char)value;
+        Py_UCS1 *to = (Py_UCS1 *)data + start;
+        memset(to, ch, length);
+        break;
+    }
+    case PyUnicode_2BYTE_KIND: {
+        assert(value <= 0xffff);
+        Py_UCS2 ch = (Py_UCS2)value;
+        Py_UCS2 *to = (Py_UCS2 *)data + start;
+        const Py_UCS2 *end = to + length;
+        for (; to < end; ++to) *to = ch;
+        break;
+    }
+    case PyUnicode_4BYTE_KIND: {
+        assert(value <= _Py_MAX_UNICODE);
+        Py_UCS4 ch = value;
+        Py_UCS4 * to = (Py_UCS4 *)data + start;
+        const Py_UCS4 *end = to + length;
+        for (; to < end; ++to) *to = ch;
+        break;
+    }
+    default: Py_UNREACHABLE();
+    }
+}
+
+
 /* --- Characters Type APIs ----------------------------------------------- */
 
 extern int _PyUnicode_IsXidStart(Py_UCS4 ch);
@@ -240,21 +278,6 @@ extern PyObject* _PyUnicode_XStrip(
     );
 
 
-/* Using explicit passed-in values, insert the thousands grouping
-   into the string pointed to by buffer.  For the argument descriptions,
-   see Objects/stringlib/localeutil.h */
-extern Py_ssize_t _PyUnicode_InsertThousandsGrouping(
-    _PyUnicodeWriter *writer,
-    Py_ssize_t n_buffer,
-    PyObject *digits,
-    Py_ssize_t d_pos,
-    Py_ssize_t n_digits,
-    Py_ssize_t min_width,
-    const char *grouping,
-    PyObject *thousands_sep,
-    Py_UCS4 *maxchar,
-    int forward);
-
 /* Dedent a string.
    Behaviour is expected to be an exact match of `textwrap.dedent`.
    Return a new reference on success, NULL with exception set on error.

Makefile.pre.in

@@ -501,7 +501,6 @@ PYTHON_OBJS=	\
 		Python/pystrtod.o \
 		Python/pystrhex.o \
 		Python/dtoa.o \
-		Python/formatter_unicode.o \
 		Python/fileutils.o \
 		Python/suggestions.o \
 		Python/perf_trampoline.o \
@@ -558,6 +557,7 @@ OBJECT_OBJS=	\
 		Objects/tupleobject.o \
 		Objects/typeobject.o \
 		Objects/typevarobject.o \
+		Objects/unicode_formatter.o \
 		Objects/unicodeobject.o \
 		Objects/unicodectype.o \
 		Objects/unionobject.o \
@@ -2091,7 +2091,6 @@ UNICODE_DEPS = \
 		$(srcdir)/Objects/stringlib/fastsearch.h \
 		$(srcdir)/Objects/stringlib/find.h \
 		$(srcdir)/Objects/stringlib/find_max_char.h \
-		$(srcdir)/Objects/stringlib/localeutil.h \
 		$(srcdir)/Objects/stringlib/partition.h \
 		$(srcdir)/Objects/stringlib/replace.h \
 		$(srcdir)/Objects/stringlib/repr.h \