On 03 Jun 2014, at 15:00, Nicholas Cole <nicholas.c...@gmail.com> wrote:
> In fact, if you are right that
> there is now some kind of translation table that could make PyObjC
> method names even better, that would be really brilliant.
I was too optimistic about that, looking at the section about methods in the
Swift book (page 339 and onwards) Swift by default treats the second and later
arguments of a method as function parameters with “external names” (see page
221 for a definition of that), which similar to required keyword parameters in
Python 3, that is:
func splitBy(separator: String, maxCount: Int) -> Array { …}
as a method on a String-like class is more or less similar to the following
Python definition:
def splitBy(separator, *, maxCount): …
And that cleanly translates into:
-(NSArray) splitBySeparator:(NSString*)separator
maxCount:(NSInteger)maxCount;
More importantly, it should generally be trivial to derive the Swift definition
from the Objective-C one.
I’ve in the past looked at using keyword arguments (basically a **kwds
argument) to do something similar for PyObjC, but that doesn’t work in general
because the order of keyword arguments in a call isn’t preserved in “kwds”, and
that makes it expensive to derive Objective-C selector from the keyword
dictionary (and in theory there might be two methods with the same segments in
a different order).
There’s been some talk about using an OrderedDict for the dictionary that’s
used for **kwds on python-list, but I don’t recall the result of that
discussion and even that did work out that would at best turn up in Python 3.5.
BTW. It might be possible to use a similar algorithm to derive Pythonic names
for Objective-C selectors, but that would either require eagerly scanning the
methods in an class, or doing the work up front and storing the result in
metadata. Neither option is particularly appealing. But you never know, maybe
Swift inspires me to come up with a smart solution to the naming problem ;-)
Ronald
P.S. This is still without having read the Swift documentation.
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