Infix operators for Python
A decorator that allows functions to be used as infix functions.
Infix operators are created and applied as such, and do not stop the function from being called normally:
>>> from infix import shift_infix as infix ... >>> @infix ... def plus(a, b): ... return a + b ... >>> print(40 <<plus>> 2) 42 >>> print(plus(5, 5)) 10
Multiple infix syntaxes are provided by the infix module:
>>> @and_infix ... def is_before(a, b): ... return a < b ... >>> print(1 &is_before& 5) True >>> @or_infix ... def minus(a, b): ... return a - b ... >>> print(1 |minus| 2) -1 >>> @xor_infix ... def until(start, stop): ... return range(start, stop) ... >>> print(list(1 ^until^ 10)) [1, 2, 3, 4, 5, 6, 7, 8, 9]
Python has a large set of operators than could be overridden to provide the infix syntax, so instead of providing them all a custom_infix function is provided. It takes two parameters, the names of the left and right operator functions:
>>> @custom_infix('__rmod__', '__mod__') ... def ate(a, b): ... return (a == 7 and b == 9) ... >>> print(7 %ate% 9) True >>> print(6 %ate% 7) False
You should be careful to avoid using operands that the objects your functions will take may provide themselves (as the initial right operand is only called if the previous object does not provide for that operand).
Works on all major Python versions (2.6, 2.7, 3.2, 3.3).
Copyright (C) 2013 Sam Clements
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