Efficient dispatch-based calling, that might be a switch statement in another language.
Project description
Switcheroo
Efficient dispatch-based calling, that might be a switch statement in another language.
short usage
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'
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
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
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
@switch.overrides('foo')
def new_handle_foo(x):
return x+2
>>> switch['foo'](1) 3
class helper usage
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
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
changes
2.0.0 (20 Sep 2022)
Drop Python 2 support.
1.1.0 (26 Nov 2020)
Add support for overrides.
Add support for more explicit usage.
1.0.0 (27 Feb 2019)
100% coverage checking and automated releases.
0.2.0 (13 Dec 2018)
Handle subclasses when using the subclass pattern.
0.1.0 (24 Nov 2018)
Initial release.
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