Sanoblast wrote:
> >>> Looking back, now that Vim script has become much more complex, a bit
> >>> more type checking would be good.
> >>>
> >> A valid point. Mabye this could be done by an assert command/function
> >> that checks its arguments or does nothing depending on an option (maybe
> >> 'debug')/flag/variable?
> >>
> >
> > Problem is the syntax of type declarations. Would require function
> > prototypes, for example. Vim script follows Python here: no type
> > declarations.
>
> I'm not sure if I can follow you here. I was thinking of something
> really simple in the line of:
>
> fun! Foo(a, b)
> assert a:a >= 0 && a:a <= 10
> assert type(a:b) == 0, "Not a string"
> return a:a + a:b
> endf
>
> assert Foo(1, 2) == 3
> assert Foo(1, -2) == -1
>
> and maybe
>
> assert_raise Foo(1, "bla")
>
> Similar commands are used in some other languages. The idea is that vim
> scripts could run in some sort of debug mode where these assertions are
> evaluated and in "normal" mode where they are ignored/stripped at
> read/compile-time (if this is possible with the current interpreter) and
> thus don't result in a speed penalty. That's probably not quite what you
> meant but I think it would help (IMHO sufficiently) when writing
> slightly non-trivial functions.
This would help a little bit, but not much. At least it requires
executing the lines of code in various ways to detect the problems. You
won't get any warnings when a script is loaded and functions are
defined without being executed.
You can already do quite a lot if you define your own assert function or
command for this. The eval() function helps a lot here. To avoid the
overhead you can comment-out the lines. Charles Campbell does this in
his scripts.
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