wxWidgets/wxPython/wx/py/pseudo.py
2003-11-12 21:34:20 +00:00

108 lines
2.5 KiB
Python

"""Provides a variety of classes to create pseudo keywords and pseudo files."""
__author__ = "Patrick K. O'Brien <pobrien@orbtech.com>"
__cvsid__ = "$Id$"
__revision__ = "$Revision$"[11:-2]
try:
True
except NameError:
True = 1==1
False = 1==0
class PseudoKeyword:
"""A callable class that calls a method passed as a parameter.
Good for creating a pseudo keyword in the python runtime
environment. The keyword is really an object that has a repr()
that calls itself which calls the method that was passed in the
init of the object. All this just to avoid having to type in the
closing parens on a method. So, for example:
>>> quit = PseudoKeyword(SomeObject.someMethod)
>>> quit
SomeObject.someMethod gets executed as if it had been called
directly and the user didn't have to type the parens, like
'quit()'. This technique is most applicable for pseudo keywords
like quit, exit and help.
If SomeObject.someMethod can take parameters, they can still be
passed by using the keyword in the traditional way with parens."""
def __init__(self, method):
"""Create a callable object that executes method when called."""
if callable(method):
self.method = method
else:
raise ValueError, 'method must be callable'
def __call__(self, *args, **kwds):
self.method(*args, **kwds)
def __repr__(self):
self()
return ''
class PseudoFile:
def __init__(self):
"""Create a file-like object."""
pass
def readline(self):
pass
def write(self, s):
pass
def writelines(self, l):
map(self.write, l)
def flush(self):
pass
def isatty(self):
pass
class PseudoFileIn(PseudoFile):
def __init__(self, readline, readlines=None):
if callable(readline):
self.readline = readline
else:
raise ValueError, 'readline must be callable'
if callable(readlines):
self.readlines = readlines
def isatty(self):
return 1
class PseudoFileOut(PseudoFile):
def __init__(self, write):
if callable(write):
self.write = write
else:
raise ValueError, 'write must be callable'
def isatty(self):
return 1
class PseudoFileErr(PseudoFile):
def __init__(self, write):
if callable(write):
self.write = write
else:
raise ValueError, 'write must be callable'
def isatty(self):
return 1