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# -*- coding: utf-8 -*-
"""
This module defines the "ns" enum for natsort is used to determine
what algorithm natsort uses.
"""
import enum
import itertools
import typing
_counter = itertools.count(0)
class ns(enum.IntEnum): # noqa: N801
"""
Enum to control the `natsort` algorithm.
This class acts like an enum to control the `natsort` algorithm. The
user may select several options simultaneously by or'ing the options
together. For example, to choose ``ns.INT``, ``ns.PATH``, and
``ns.LOCALE``, you could do ``ns.INT | ns.LOCALE | ns.PATH``. Each
function in the :mod:`natsort` package has an `alg` option that accepts
this enum to allow fine control over how your input is sorted.
Each option has a shortened 1- or 2-letter form.
.. note:: Please read :ref:`locale_issues` before using ``ns.LOCALE``.
Attributes
----------
INT, I (default)
The default - parse numbers as integers.
FLOAT, F
Tell `natsort` to parse numbers as floats.
UNSIGNED, U (default)
Tell `natsort` to ignore any sign (i.e. "-" or "+") to the immediate
left of a number. This is the default.
SIGNED, S
Tell `natsort` to take into account any sign (i.e. "-" or "+")
to the immediate left of a number.
REAL, R
This is a shortcut for ``ns.FLOAT | ns.SIGNED``, which is useful
when attempting to sort real numbers.
NOEXP, N
Tell `natsort` to not search for exponents as part of a float number.
For example, with `NOEXP` the number "5.6E5" would be interpreted
as `5.6`, `"E"`, and `5` instead of `560000`.
NUMAFTER, NA
Tell `natsort` to sort numbers after non-numbers. By default
numbers will be ordered before non-numbers.
PATH, P
Tell `natsort` to interpret strings as filesystem paths, so they
will be split according to the filesystem separator
(i.e. '/' on UNIX, '\\' on Windows), as well as splitting on the
file extension, if any. Without this, lists of file paths like
``['Folder/', 'Folder (1)/', 'Folder (10)/']`` will not be
sorted properly; 'Folder/' will be placed at the end, not at the
front. It is the same as setting the old `as_path` option to
`True`.
COMPATIBILITYNORMALIZE, CN
Use the "NFKD" unicode normalization form on input rather than the
default "NFD". This will transform characters such as '⑦' into
'7'. Please see https://stackoverflow.com/a/7934397/1399279,
https://stackoverflow.com/a/7931547/1399279,
and https://unicode.org/reports/tr15/ for full details into unicode
normalization.
LOCALE, L
Tell `natsort` to be locale-aware when sorting. This includes both
proper sorting of alphabetical characters as well as proper
handling of locale-dependent decimal separators and thousands
separators. This is a shortcut for
``ns.LOCALEALPHA | ns.LOCALENUM``.
Your sorting results will vary depending on your current locale.
LOCALEALPHA, LA
Tell `natsort` to be locale-aware when sorting, but only for
alphabetical characters.
LOCALENUM, LN
Tell `natsort` to be locale-aware when sorting, but only for
decimal separators and thousands separators.
IGNORECASE, IC
Tell `natsort` to ignore case when sorting. For example,
``['Banana', 'apple', 'banana', 'Apple']`` would be sorted as
``['apple', 'Apple', 'Banana', 'banana']``.
LOWERCASEFIRST, LF
Tell `natsort` to put lowercase letters before uppercase letters
when sorting. For example,
``['Banana', 'apple', 'banana', 'Apple']`` would be sorted as
``['apple', 'banana', 'Apple', 'Banana']`` (the default order
would be ``['Apple', 'Banana', 'apple', 'banana']`` which is
the order from a purely ordinal sort).
Useless when used with `IGNORECASE`. Please note that if used
with ``LOCALE``, this actually has the reverse effect and will
put uppercase first (this is because ``LOCALE`` already puts
lowercase first); you may use this to your advantage if you
need to modify the order returned with ``LOCALE``.
GROUPLETTERS, G
Tell `natsort` to group lowercase and uppercase letters together
when sorting. For example,
``['Banana', 'apple', 'banana', 'Apple']`` would be sorted as
``['Apple', 'apple', 'Banana', 'banana']``.
Useless when used with `IGNORECASE`; use with `LOWERCASEFIRST`
to reverse the order of upper and lower case. Generally not
needed with `LOCALE`.
CAPITALFIRST, C
Only used when `LOCALE` is enabled. Tell `natsort` to put all
capitalized words before non-capitalized words. This is essentially
the inverse of `GROUPLETTERS`, and is the default Python sorting
behavior without `LOCALE`.
UNGROUPLETTERS, UG
An alias for `CAPITALFIRST`.
NANLAST, NL
If an NaN shows up in the input, this instructs `natsort` to
treat these as +Infinity and place them after all the other numbers.
By default, an NaN be treated as -Infinity and be placed first.
Note that this ``None`` is treated like NaN internally.
Notes
-----
If you prefer to use `import natsort as ns` as opposed to
`from natsort import natsorted, ns`, the `ns` options are
available as top-level imports.
>>> import natsort as ns
>>> a = ['num5.10', 'num-3', 'num5.3', 'num2']
>>> ns.natsorted(a, alg=ns.REAL) == ns.natsorted(a, alg=ns.ns.REAL)
True
"""
# The below are the base ns options. The values will be stored as powers
# of two so bitmasks can be used to extract the user's requested options.
FLOAT = F = 1 << next(_counter)
SIGNED = S = 1 << next(_counter)
NOEXP = N = 1 << next(_counter)
PATH = P = 1 << next(_counter)
LOCALEALPHA = LA = 1 << next(_counter)
LOCALENUM = LN = 1 << next(_counter)
IGNORECASE = IC = 1 << next(_counter)
LOWERCASEFIRST = LF = 1 << next(_counter)
GROUPLETTERS = G = 1 << next(_counter)
UNGROUPLETTERS = CAPITALFIRST = C = UG = 1 << next(_counter)
NANLAST = NL = 1 << next(_counter)
COMPATIBILITYNORMALIZE = CN = 1 << next(_counter)
NUMAFTER = NA = 1 << next(_counter)
# Following were previously options but are now defaults.
DEFAULT = 0
INT = I = 0 # noqa: E741
UNSIGNED = U = 0
# The following are bitwise-OR combinations of other fields.
REAL = R = FLOAT | SIGNED
LOCALE = L = LOCALEALPHA | LOCALENUM
# The below is private for internal use only.
NS_DUMB = 1 << 31
# An integer can be used in place of the ns enum so make the
# type to use for this enum a union of it and an inteter.
NSType = typing.Union[ns, int]
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