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[commands] Raise TypeError when Optional is used with Greedy converter

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Sebastian Law 2020-06-28 00:54:34 -07:00 committed by GitHub
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commit 7a07644de3
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2 changed files with 6 additions and 2 deletions
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4
discord/ext/commands/converter.py
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@ -26,6 +26,7 @@ DEALINGS IN THE SOFTWARE.
import re
import inspect
import typing
import discord
@ -555,6 +556,9 @@ class _Greedy:
if converter is str or converter is type(None) or converter is _Greedy:
raise TypeError('Greedy[%s] is invalid.' % converter.__name__)
if getattr(converter, '__origin__', None) is typing.Union and type(None) in converter.__args__:
raise TypeError('Greedy[%r] is invalid.' % converter)
return self.__class__(converter=converter)
Greedy = _Greedy()

4
docs/ext/commands/commands.rst
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@ -552,8 +552,8 @@ This command can be invoked any of the following ways:
unintended parsing ambiguities in your code. One technique would be to clamp down the expected syntaxes
allowed through custom converters or reordering the parameters to minimise clashes.
To help aid with some parsing ambiguities, :class:`str`, ``None`` and :data:`~ext.commands.Greedy` are
forbidden as parameters for the :data:`~ext.commands.Greedy` converter.
To help aid with some parsing ambiguities, :class:`str`, ``None``, :data:`typing.Optional` and
:data:`~ext.commands.Greedy` are forbidden as parameters for the :data:`~ext.commands.Greedy` converter.
.. _ext_commands_error_handler: