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import re
from warnings import warn
from .constants import keys
DEPRECATED_KEY_RE = re.compile(r'[A-Z]')
PREFIX_RE = re.compile(r'^K_(?!\d$)')
class Keyboard:
"""The current state of the keyboard.
Each attribute represents a key. For example, ::
keyboard.a
is True if the 'A' key is depressed, and False otherwise.
"""
# The current key state. This may as well be a class attribute - there's
# only one keyboard.
_pressed = set()
def __getattr__(self, kname):
if DEPRECATED_KEY_RE.match(kname):
warn(
"Uppercase keyboard attributes (eg. keyboard.%s) are "
"deprecated." % kname,
DeprecationWarning,
2
)
kname = PREFIX_RE.sub('', kname)
try:
key = keys[kname.upper()]
except AttributeError:
raise AttributeError('The key "%s" does not exist' % key)
return key.value in self._pressed
def _press(self, key):
"""Called by Game to mark the key as pressed."""
self._pressed.add(key)
def _release(self, key):
"""Called by Game to mark the key as released."""
self._pressed.discard(key)
def __getitem__(self, k):
if isinstance(k, keys):
return k.value in self._pressed
else:
warn(
"String lookup in keyboard (eg. keyboard[%r]) is "
"deprecated." % k,
DeprecationWarning,
2
)
return getattr(self, k)
keyboard = Keyboard()
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