I posted this suggestion earlier in the callable type syntax discussion, at
which point it was completely ignored. Possibly because it’s a really stupid
idea, but let me post it again on the off chance that it isn’t a stupid idea
but was overlooked.
> If I can make a wild suggestion: why not create a little language for type
> specifications?
>
> If you look at other programming languages you’ll see that the “type
> definition sub-language” is often completely different from the “execution
> sub-language”, with only some symbols in common and used in vaguely related
> ways. `bool (*myfuncptr)(int, float*)` uses a completely different set of
> syntactic rules than `rv = (*myfunptr)(*myintptr, &myfloat)`. So with some
> grains of salt you could say that C is comprised of a declarative typing
> sublanguage and an imperative execution sublanguage.
And an even better example is Pascal, which uses a set of syntactic constructs
for typing that are completely different from the execution statement syntax:
`var a : array[1..10] of real` looks very different from `a[1]`, where C `float
a[10]` looks pretty similar to `a[10]`.
The next bit of my original email is another wild idea, the previous bit
doesn’t depend on it really. I can imagine completely different ways of doing a
typing sublanguage:
> Python typing uses basically a subset of the execution expression syntax as
> its declarative typing language.
>
> What if we created a little language that is clearly flagged, for example as
> t”….” or t’….’? Then we could simply define the typestring language to be
> readable, so you could indeed say t”(int, str) -> bool”. And we could even
> allow escapes (similar to f-strings) so that the previous expression could
> also be specified, if you really wanted to, as t”{typing.Callable[[int, str],
> bool}”.
--
Jack Jansen, <jack.jan...@cwi.nl>, http://www.cwi.nl/~jack
If I can't dance I don't want to be part of your revolution -- Emma Goldman
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