|CircleCI|_
.. |CircleCI| image:: https://circleci.com/gh/simplistix/switcheroo/tree/master.svg?style=shield .. _CircleCI: https://circleci.com/gh/simplistix/switcheroo/tree/master
Efficient dispatch-based calling, that might be a switch statement in another language.
short usage
.. code-block:: python
from switcheroo import Switch
switch = Switch({
'foo': lambda x: x+1,
})
>>> switch['foo'](1)
2
>>> switch['bar'](1)
Traceback (most recent call last):
...
KeyError: 'bar'
.. code-block:: python
from switcheroo import Switch, default
switch = Switch({
'foo': lambda x: x+1,
default: lambda x: x-1,
})
>>> switch['foo'](1)
2
>>> switch['bar'](1)
0
explicit usage.. code-block:: python
from switcheroo import Switch
def handle_foo(x):
return x+1
def handle_others(x):
return x-1
switch = Switch()
switch.register('foo', handler=handle_foo)
switch.default(handle_others)switch.lookup('foo')(1) 2
switch.lookup('bar')(1) 0
switch.override('foo', lambda x: x+2) switch.lookup('foo')(1) 3
decorator usage
.. code-block:: python
from switcheroo import Switch
switch = Switch()
@switch.handles('foo')
def handle_foo(x):
return x+1
@switch.default
def handle_others(x):
return x-1
>>> switch['foo'](1)
2
>>> switch['bar'](1)
0
.. code-block:: python
@switch.overrides('foo')
def new_handle_foo(x):
return x+2
>>> switch['foo'](1)
3
class helper usage.. code-block:: python
class MoarThingz(object):
switch = Switch()
def __init__(self, state):
self.state = state
@switch.handles('foo')
def handle_foo(self, x):
return self.state - x
@switch.default
def handle_foo(self, x):
return self.state + x
def dispatch(self, case, factor, x):
return factor * self.switch[case](self, x)things = MoarThingz(3) things.dispatch('foo', factor=1, x=1) 2 things.dispatch('bar', factor=-1, x=2) -5
subclass usage
.. code-block:: python
from switcheroo import Switch, handles, default
class MySwitch(Switch):
@handles('foo')
def handles(x):
return x+1
@default
def default(x):
return x-1
>>> MySwitch['foo'](1)
2
>>> MySwitch['bar'](1)
0
changesAdd support for overrides.
Add support for more explicit usage.