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+"""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]
+
+
+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