"""
commands.converter
==================
This module contains useful functions and classes for command argument conversion.
Some of the converters within are included provisionaly and are marked as such.
"""
import functools
import os
import re
import warnings
from datetime import timedelta
from typing import (
TYPE_CHECKING,
Generic,
Optional,
Optional as NoParseOptional,
Tuple,
List,
Dict,
Type,
TypeVar,
Literal as Literal,
Any,
)
import discord
from discord.ext import commands as dpy_commands
from discord.ext.commands import BadArgument
from ..i18n import Translator
from ..utils.chat_formatting import humanize_timedelta, humanize_list
if TYPE_CHECKING:
from .context import Context
__all__ = [
"DictConverter",
"GuildConverter",
"UserInputOptional",
"NoParseOptional",
"TimedeltaConverter",
"get_dict_converter",
"get_timedelta_converter",
"parse_timedelta",
"Literal",
]
_ = Translator("commands.converter", __file__)
ID_REGEX = re.compile(r"([0-9]{15,21})")
# Taken with permission from
# https://github.com/mikeshardmind/SinbadCogs/blob/816f3bc2ba860243f75112904b82009a8a9e1f99/scheduler/time_utils.py#L9-L19
TIME_RE_STRING = r"\s?".join(
[
r"((?P<weeks>\d+?)\s?(weeks?|w))?",
r"((?P<days>\d+?)\s?(days?|d))?",
r"((?P<hours>\d+?)\s?(hours?|hrs|hr?))?",
r"((?P<minutes>\d+?)\s?(minutes?|mins?|m(?!o)))?", # prevent matching "months"
r"((?P<seconds>\d+?)\s?(seconds?|secs?|s))?",
]
)
TIME_RE = re.compile(TIME_RE_STRING, re.I)
[docs]def parse_timedelta(
argument: str,
*,
maximum: Optional[timedelta] = None,
minimum: Optional[timedelta] = None,
allowed_units: Optional[List[str]] = None,
) -> Optional[timedelta]:
"""
This converts a user provided string into a timedelta
The units should be in order from largest to smallest.
This works with or without whitespace.
Parameters
----------
argument : str
The user provided input
maximum : Optional[timedelta]
If provided, any parsed value higher than this will raise an exception
minimum : Optional[timedelta]
If provided, any parsed value lower than this will raise an exception
allowed_units : Optional[List[str]]
If provided, you can constrain a user to expressing the amount of time
in specific units. The units you can chose to provide are the same as the
parser understands. (``weeks``, ``days``, ``hours``, ``minutes``, ``seconds``)
Returns
-------
Optional[timedelta]
If matched, the timedelta which was parsed. This can return `None`
Raises
------
BadArgument
If the argument passed uses a unit not allowed, but understood
or if the value is out of bounds.
"""
matches = TIME_RE.match(argument)
allowed_units = allowed_units or ["weeks", "days", "hours", "minutes", "seconds"]
if matches:
params = {k: int(v) for k, v in matches.groupdict().items() if v is not None}
for k in params.keys():
if k not in allowed_units:
raise BadArgument(
_("`{unit}` is not a valid unit of time for this command").format(unit=k)
)
if params:
delta = timedelta(**params)
if maximum and maximum < delta:
raise BadArgument(
_(
"This amount of time is too large for this command. (Maximum: {maximum})"
).format(maximum=humanize_timedelta(timedelta=maximum))
)
if minimum and delta < minimum:
raise BadArgument(
_(
"This amount of time is too small for this command. (Minimum: {minimum})"
).format(minimum=humanize_timedelta(timedelta=minimum))
)
return delta
return None
[docs]class GuildConverter(discord.Guild):
"""Converts to a `discord.Guild` object.
The lookup strategy is as follows (in order):
1. Lookup by ID.
2. Lookup by name.
"""
@classmethod
async def convert(cls, ctx: "Context", argument: str) -> discord.Guild:
match = ID_REGEX.fullmatch(argument)
if match is None:
ret = discord.utils.get(ctx.bot.guilds, name=argument)
else:
guild_id = int(match.group(1))
ret = ctx.bot.get_guild(guild_id)
if ret is None:
raise BadArgument(_('Server "{name}" not found.').format(name=argument))
return ret
class _APIToken(discord.ext.commands.Converter):
"""Converts to a `dict` object.
This will parse the input argument separating the key value pairs into a
format to be used for the core bots API token storage.
This will split the argument by a space, comma, or semicolon and return a dict
to be stored. Since all API's are different and have different naming convention,
this leaves the onus on the cog creator to clearly define how to setup the correct
credential names for their cogs.
Note: Core usage of this has been replaced with `DictConverter` use instead.
.. warning::
This will be removed in the first minor release after 2020-08-05.
"""
async def convert(self, ctx: "Context", argument) -> dict:
bot = ctx.bot
result = {}
match = re.split(r";|,| ", argument)
# provide two options to split incase for whatever reason one is part of the api key we're using
if len(match) > 1:
result[match[0]] = "".join(r for r in match[1:])
else:
raise BadArgument(_("The provided tokens are not in a valid format."))
if not result:
raise BadArgument(_("The provided tokens are not in a valid format."))
return result
_APIToken.__name__ = "APIToken"
def __getattr__(name: str, *, stacklevel: int = 2) -> Any:
# honestly, this is awesome (PEP-562)
if name == "APIToken":
warnings.warn(
"`APIToken` is deprecated since Red 3.3.0 and will be removed"
" in the first minor release after 2020-08-05. Use `DictConverter` instead.",
DeprecationWarning,
stacklevel=stacklevel,
)
return globals()["_APIToken"]
raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
def __dir__() -> List[str]:
return [*globals().keys(), "APIToken"]
# Below this line are a lot of lies for mypy about things that *end up* correct when
# These are used for command conversion purposes. Please refer to the portion
# which is *not* for type checking for the actual implementation
# and ensure the lies stay correct for how the object should look as a typehint
if TYPE_CHECKING:
DictConverter = Dict[str, str]
else:
[docs] class DictConverter(dpy_commands.Converter):
"""
Converts pairs of space seperated values to a dict
"""
def __init__(self, *expected_keys: str, delims: Optional[List[str]] = None):
self.expected_keys = expected_keys
self.delims = delims or [" "]
self.pattern = re.compile(r"|".join(re.escape(d) for d in self.delims))
async def convert(self, ctx: "Context", argument: str) -> Dict[str, str]:
ret: Dict[str, str] = {}
args = self.pattern.split(argument)
if len(args) % 2 != 0:
raise BadArgument()
iterator = iter(args)
for key in iterator:
if self.expected_keys and key not in self.expected_keys:
raise BadArgument(_("Unexpected key {key}").format(key=key))
ret[key] = next(iterator)
return ret
if TYPE_CHECKING:
def get_dict_converter(*expected_keys: str, delims: Optional[List[str]] = None) -> Type[dict]:
...
else:
[docs] def get_dict_converter(*expected_keys: str, delims: Optional[List[str]] = None) -> Type[dict]:
"""
Returns a typechecking safe `DictConverter` suitable for use with discord.py
"""
class PartialMeta(type):
__call__ = functools.partialmethod(
type(DictConverter).__call__, *expected_keys, delims=delims
)
class ValidatedConverter(DictConverter, metaclass=PartialMeta):
pass
return ValidatedConverter
if TYPE_CHECKING:
TimedeltaConverter = timedelta
else:
[docs] class TimedeltaConverter(dpy_commands.Converter):
"""
This is a converter for timedeltas.
The units should be in order from largest to smallest.
This works with or without whitespace.
See `parse_timedelta` for more information about how this functions.
Attributes
----------
maximum : Optional[timedelta]
If provided, any parsed value higher than this will raise an exception
minimum : Optional[timedelta]
If provided, any parsed value lower than this will raise an exception
allowed_units : Optional[List[str]]
If provided, you can constrain a user to expressing the amount of time
in specific units. The units you can choose to provide are the same as the
parser understands: (``weeks``, ``days``, ``hours``, ``minutes``, ``seconds``)
default_unit : Optional[str]
If provided, it will additionally try to match integer-only input into
a timedelta, using the unit specified. Same units as in ``allowed_units``
apply.
"""
def __init__(self, *, minimum=None, maximum=None, allowed_units=None, default_unit=None):
self.allowed_units = allowed_units
self.default_unit = default_unit
self.minimum = minimum
self.maximum = maximum
async def convert(self, ctx: "Context", argument: str) -> timedelta:
if self.default_unit and argument.isdecimal():
argument = argument + self.default_unit
delta = parse_timedelta(
argument,
minimum=self.minimum,
maximum=self.maximum,
allowed_units=self.allowed_units,
)
if delta is not None:
return delta
raise BadArgument() # This allows this to be a required argument.
if TYPE_CHECKING:
def get_timedelta_converter(
*,
default_unit: Optional[str] = None,
maximum: Optional[timedelta] = None,
minimum: Optional[timedelta] = None,
allowed_units: Optional[List[str]] = None,
) -> Type[timedelta]:
...
else:
[docs] def get_timedelta_converter(
*,
default_unit: Optional[str] = None,
maximum: Optional[timedelta] = None,
minimum: Optional[timedelta] = None,
allowed_units: Optional[List[str]] = None,
) -> Type[timedelta]:
"""
This creates a type suitable for typechecking which works with discord.py's
commands.
See `parse_timedelta` for more information about how this functions.
Parameters
----------
maximum : Optional[timedelta]
If provided, any parsed value higher than this will raise an exception
minimum : Optional[timedelta]
If provided, any parsed value lower than this will raise an exception
allowed_units : Optional[List[str]]
If provided, you can constrain a user to expressing the amount of time
in specific units. The units you can choose to provide are the same as the
parser understands: (``weeks``, ``days``, ``hours``, ``minutes``, ``seconds``)
default_unit : Optional[str]
If provided, it will additionally try to match integer-only input into
a timedelta, using the unit specified. Same units as in ``allowed_units``
apply.
Returns
-------
type
The converter class, which will be a subclass of `TimedeltaConverter`
"""
class PartialMeta(type):
__call__ = functools.partialmethod(
type(DictConverter).__call__,
allowed_units=allowed_units,
default_unit=default_unit,
minimum=minimum,
maximum=maximum,
)
class ValidatedConverter(TimedeltaConverter, metaclass=PartialMeta):
pass
return ValidatedConverter
if not TYPE_CHECKING:
[docs] class NoParseOptional:
"""
This can be used instead of `typing.Optional`
to avoid discord.py special casing the conversion behavior.
.. warning::
This converter class is still provisional.
.. seealso::
The `ignore_optional_for_conversion` option of commands.
"""
def __class_getitem__(cls, key):
if isinstance(key, tuple):
raise TypeError("Must only provide a single type to Optional")
return key
_T_OPT = TypeVar("_T_OPT", bound=Type)
if TYPE_CHECKING or os.getenv("BUILDING_DOCS", False):
else:
UserInputOptional = Optional
if not TYPE_CHECKING:
[docs] class Literal(dpy_commands.Converter):
"""
This can be used as a converter for `typing.Literal`.
In a type checking context it is `typing.Literal`.
In a runtime context, it's a converter which only matches the literals it was given.
.. warning::
This converter class is still provisional.
"""
def __init__(self, valid_names: Tuple[str]):
self.valid_names = valid_names
def __call__(self, ctx, arg):
# Callable's are treated as valid types:
# https://github.com/python/cpython/blob/3.8/Lib/typing.py#L148
# Without this, ``typing.Union[Literal["clear"], bool]`` would fail
return self.convert(ctx, arg)
async def convert(self, ctx, arg):
if arg in self.valid_names:
return arg
raise BadArgument(_("Expected one of: {}").format(humanize_list(self.valid_names)))
def __class_getitem__(cls, k):
if not k:
raise ValueError("Need at least one value for Literal")
if isinstance(k, tuple):
return cls(k)
else:
return cls((k,))
