Re: [Wrapl-discussion] How to invoke such method :"@"?

[Roman M. <rom...@gm...>]

>
>
>> VAR text <- mylist@String.T;
>

Indeed. I have already used @ to convert an integer to a string in MOD
Bottles. I think I didn't get the very thing that the type itself is used as
an argument.

You can also use
>
> mylist@(String.T, " ")
>

I come up with such line:
Out:write(verse[2,0]@(String.T, "") + verse[1]);
I tried it on a Linux machine with the latest Wrapl version and it works.

but I'm not very happy with this syntax and am still open to suggestions
> about changing it.
>

Perhaps being not so intuitive at first sight, it seems OK to me. Knowing
that this syntax comes from a general rule of how to call a method, it seems
acceptable.

The first thought on how to change it is to use something similar to: mylist
@ String.T VIA " "; analogous to :"[]=", and possibly using some special
character :"@~" (mylist @ String.T ~ " ";). This is from my perspective,
however.

By the way, you're the first person to seriously try using Wrapl, so the
> online documentation may be a bit lacking in places. I'll try to improve it
>  based on your comments.
>
> Also, the Windows port of Wrapl is a bit out of date, I don't think any of
> the versions of @ with 3 or more arguments are implemented in it. Since your
> last comment, I have mostly fixed the Windows port and will put the new
> version on the website within the next week.
>

Thank you. Most of the time I work on Windows. Recently, though, I set up a
Linux machine to experiment with. If you are interested, here is a little
bit of my experience with Wrapl installation on Linux:

--
I set up a fresh Debian-compatible distro - Linux Mint - on VirtualBox. Then
I installed both wrapl-1.7.1041.deb and wredit-1.7.1041.deb. Some
dependencies were installed by package manager. The whole installation went
without an issue. In the shell I got this:

roman$ wrapl
Error: /usr/lib/libtermcap.so: undefined symbol: setupterm
Error: symbol setupterm not exported from libtermcap
Error relocating [82d7808] /usr/lib/riva/Util/Tecla.riva:93

As I found out this relates to the Wrapl interpreter only, not to riva.
"Hello World" scripts were working.

I searched for "termcap Debian" and found this page
http://archive.debian.net/bo/admin/termcap-compat which explains
incompatibility between termcap and current Debian versions. So I installed
the package mentioned on the page. Yet, it didn't help. The error remained.

The page also mentions libncurses, so in search for a solution the next
thing I did is installed libncurses5-dev package, since libncurses5 was
already in place. And this did help. Wrapl started right away.

With not much experience, I think the only missing dependency is some
library in libncurses5-dev package.
--

Going further, I want to ask how to read this descriptions in
Libraries:Agg:List:

:"="(_ @ T, _ @ T, _ @ Agg.ObjectTable.T)
Does it compare two lists? [1, 2] = [1, 2]; I am getting "failure".
What is third argument?
Does underscore have special meaning in descriptions or it just denotes
"something"?

:"@"(_ @ T, _ = Std.String.T)
this seems similar to:
:"@"(list @ T, _ = Std.String.T, sep @ Std.String.T) : Std.String.T
but without separator and it does not define return type. It works:
--> VAR s <- mylist@String.T;
[one, two, three]
--> ? s;
C:\Wrapl\lib\Std\String.T
But I honestly wonder, is this practical after a conversion to have a string
formatted as list?

-- 
Roman