def apply(din: Maybe, *, f, args=None):
maybe_args = []
maybe_kwds = {}
if isinstance(args, (list, tuple)):
for a in args:
maybe_args.append(sync_with(din, a))
elif isinstance(args, dict):
for n, v in args.items():
maybe_kwds[n] = sync_with(din, v)
if maybe_args or maybe_kwds:
return din | unionmap(f=(None, f(*maybe_args, **maybe_kwds))) | Maybe
else:
return din | unionmap(f=(None, f)) | Maybe
def ucase(din: Union, *, f, fcat=ccat, tout=None, fmux=mux, mapping=None):
dout = din \
| unionmap(f=f, fmux=fmux, mapping=mapping, use_dflt=False)
if dout.dtype.types.count(dout.dtype.types[0]) != len(dout.dtype.types):
raise TypeMatchError(
f'output types of all input types need be the same, but got "{dout.dtype.types}'
)
return dout | union_collapse(t=tout)
def case(cond, din, *, f, fcat=ccat, tout=None, **kwds):
try:
len(f)
except TypeError:
f = (None, f)
return fcat(din, cond) \
| Union \
| unionmap(f=f, **kwds) \
| union_collapse(t=tout)
def case(cond, din, *, f, fcat=ccat, tout=None, mapping=None, **kwds):
try:
len(f)
except TypeError:
f = (None, f)
if mapping is None:
in_num_types = len(f)
else:
in_num_types = max(mapping.keys()) + 1
return fcat(din, cond) \
| Union[(din.dtype, ) * in_num_types] \
| unionmap(f=f, mapping=mapping, **kwds) \
| union_collapse(t=tout)
def maybe_when(cond, din, *, f, fcat=ccat):
return fcat(din, cond) \
| Union \
| unionmap(f=(fix(val=Unit()), f)) \
| Maybe
