Nick Coghlan wrote:
> [...]
> def default_adapter(self, *args):
> """Call result when no adapter was found"""
> raise TypeError("Can't adapt %s to %s" %
> (args[0].__class__.__name__, self.name))
+1 This makes it easy to add fallbacks:
class XReprProtocol(Protocol):
def default_adapter(self, *args):
return repr(*args)
xrepr = XReprProtocol("xrepr")
@XReprProtocol.register_for(list)
def xrepr_list(obj):
return "[%s]" % ", ".join(xrepr(x) for x in obj)
@XReprProtocol.register_for(tuple)
def xrepr_tuple(obj):
return "(%s)" % ", ".join(xrepr(x) for x in obj)
@XReprProtocol.register_for(int, long)
def xrepr_number(obj):
return hex(obj)
For all other objects it falls back to the normal repr().
> def __call__(self, *args):
> """Adapt supplied arguments to this protocol"""
> for key in self.candidate_keys(args):
> try:
> adapter = self.registry[key]
> except KeyError:
> pass
> else:
> return adapter(*args)
> return self.default_adapter(*args)
It would be great if __call__() would pass on keywords arguments to the
adapter too. (This would probably mean that candidate_keys would need
*args, **kwargs arguments). But then calling the adapter is totally generic.
Servus,
Walter
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