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1"""
2Constants for generating the layout.
3"""
4
5__author__ = "Steve Dower <steve.dower@python.org>"
6__version__ = "3.8"
7
8import os
9import struct
10import sys
11
12
13def _unpack_hexversion():
14    try:
15        hexversion = int(os.getenv("PYTHON_HEXVERSION"), 16)
16    except (TypeError, ValueError):
17        hexversion = sys.hexversion
18    return struct.pack(">i", hexversion)
19
20
21def _get_suffix(field4):
22    name = {0xA0: "a", 0xB0: "b", 0xC0: "rc"}.get(field4 & 0xF0, "")
23    if name:
24        serial = field4 & 0x0F
25        return f"{name}{serial}"
26    return ""
27
28
29VER_MAJOR, VER_MINOR, VER_MICRO, VER_FIELD4 = _unpack_hexversion()
30VER_SUFFIX = _get_suffix(VER_FIELD4)
31VER_FIELD3 = VER_MICRO << 8 | VER_FIELD4
32VER_DOT = "{}.{}".format(VER_MAJOR, VER_MINOR)
33
34PYTHON_DLL_NAME = "python{}{}.dll".format(VER_MAJOR, VER_MINOR)
35PYTHON_STABLE_DLL_NAME = "python{}.dll".format(VER_MAJOR)
36PYTHON_ZIP_NAME = "python{}{}.zip".format(VER_MAJOR, VER_MINOR)
37PYTHON_PTH_NAME = "python{}{}._pth".format(VER_MAJOR, VER_MINOR)
38
39PYTHON_CHM_NAME = "python{}{}{}{}.chm".format(
40    VER_MAJOR, VER_MINOR, VER_MICRO, VER_SUFFIX
41)
42
43FREETHREADED_PYTHON_DLL_NAME = "python{}{}t.dll".format(VER_MAJOR, VER_MINOR)
44FREETHREADED_PYTHON_STABLE_DLL_NAME = "python{}t.dll".format(VER_MAJOR)
45