# -*- python -*-
import sys
def switchFor (target):
sw = '__switch_table__'
# please pretend the frame hack is not here,
# it happens to work for classes and messing with
# frame stack in a try/except is probably okay
try:
raise Exception()
except:
defs = sys.exc_info()[2].tb_frame.f_back.f_locals
if sw not in defs:
defs[sw] = {}
table = defs[sw]
def _(meth):
table[target] = meth
return meth
return _
class SwitchMixin (object):
def __init__ (self):
self.__switch_table__ = self.__switch_table__.copy()
def switchOn (self, target, *args, **kw):
return self.__switch_table__[target](self, *args, **kw)
if __name__ == '__main__':
class SwitchTest(SwitchMixin):
@switchFor("foo")
def switch (self, arg):
print arg * 3
@switchFor("bar")
def switch (self, arg):
print "__%s__" % (arg,)
@switchFor("baz")
def switch (self, arg):
print arg + ''.join(reversed(arg))
st = SwitchTest()
st.switchOn("foo", "oof")
st.switchOn("bar", "rab")
st.switchOn("baz", "zab")
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