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Added caching for __str__, __repr__, and __len__.

This commit is contained in:
Jeremy Fincher 2003-08-01 14:23:54 +00:00
parent 6e19d921c8
commit a4b6ee2028
1 changed files with 23 additions and 9 deletions
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32
src/ircmsgs.py
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@ -44,10 +44,15 @@ class IrcMsg(object):
"""Class to represent an IRC message. """Class to represent an IRC message.
""" """
__slots__ = ('_args', '_command', '_host', '_nick', __slots__ = ('_args', '_command', '_host', '_nick',
'_prefix', '_user', '_hash') '_prefix', '_user',
'_hash', '_str', '_repr', '_len')
def __init__(self, s='', command='', args=None, prefix='', msg=None): def __init__(self, s='', command='', args=None, prefix='', msg=None):
if not s and not command and not msg: if not s and not command and not msg:
raise ValueError, 'IRC messages require a command.' raise ValueError, 'IRC messages require a command.'
self._str = None
self._repr = None
self._hash = None
self._len = None
if msg: if msg:
prefix = msg.prefix prefix = msg.prefix
command = msg.command command = msg.command
@ -92,6 +97,8 @@ class IrcMsg(object):
args = property(lambda self: self._args) args = property(lambda self: self._args)
def __str__(self): def __str__(self):
if self._str is not None:
return self._str
ret = '' ret = ''
if self.prefix: if self.prefix:
ret = ':%s %s' % (self.prefix, self.command) ret = ':%s %s' % (self.prefix, self.command)
@ -105,11 +112,14 @@ class IrcMsg(object):
ret = '%s :%s\r\n' % (ret, self.args[0]) ret = '%s :%s\r\n' % (ret, self.args[0])
else: else:
ret = ret + '\r\n' ret = ret + '\r\n'
self._str = ret
return ret return ret
def __len__(self): def __len__(self):
# This might not take into account the length of the prefix, but leaves # This might not take into account the length of the prefix, but leaves
# some room for variation. # some room for variation.
if self._len is not None:
return self._len
ret = 0 ret = 0
if self.prefix: if self.prefix:
ret += len(self.prefix) ret += len(self.prefix)
@ -120,7 +130,9 @@ class IrcMsg(object):
for arg in self.args: for arg in self.args:
ret += len(arg) + 1 # Remember the space prior to the arg. ret += len(arg) + 1 # Remember the space prior to the arg.
ret += 2 # For the colon before the prefix and before the last arg. ret += 2 # For the colon before the prefix and before the last arg.
self._len = ret
return ret return ret
def __eq__(self, other): def __eq__(self, other):
return hash(self) == hash(other) and \ return hash(self) == hash(other) and \
@ -132,17 +144,19 @@ class IrcMsg(object):
return not (self == other) return not (self == other)
def __hash__(self): def __hash__(self):
try: if self._hash is not None:
return self._hash
except AttributeError:
self._hash = hash(self.command) & \
hash(self.prefix) & \
hash(self.args)
return self._hash return self._hash
self._hash = hash(self.command) & \
hash(self.prefix) & \
hash(self.args)
return self._hash
def __repr__(self): def __repr__(self):
return '%s(prefix=%r, command=%r, args=%r)' % \ if self._repr is not None:
(self.__class__.__name__, self.prefix, self.command, self.args) return self._repr
self._repr = 'IrcMsg(prefix=%r, command=%r, args=%r)' % \
(self.prefix, self.command, self.args)
return self._repr
def __getstate__(self): def __getstate__(self):
return str(self) return str(self)