On Sunday, 16 April 2017 at 16:10:15 UTC, Nick Sabalausky
(Abscissa) wrote:
On 04/15/2017 04:35 PM, crimaniak wrote:
On Saturday, 15 April 2017 at 20:04:13 UTC, Jonas Drewsen
wrote:
The compiler will basically lower the $"..." string to a
mixin that
concatenates
the expression parts of the (inside the {}) and the plain
text parts.
It's easy implementable as a library (see
https://github.com/Abscissa/scriptlike#string-interpolation)
so it does
not seem like a good idea to modify the language, only to
change
interp!"" to $"".
Yea, and note, I'm still open to the idea of better names than
"interp". I'm still not entirely happy with that name. I'm even
half-tempted to use "_".
The only one problem I've found with doing it in library
though: Far as I could tell, it seems to require the caller
uses string mixins, which makes actually using it a little
uglier and more verbose than I would like.
I was trying to get it shorter:
// From
// Output: The number 21 doubled is 42!
int num = 21;
writeln( mixin(interp!"The number ${num} doubled is ${num * 2}!")
);
defining a new method exho! (derived from echo + mixin...:-)
auto exho(string x)(){
return mixin("writeln("~interp!x~")");}
You can just write:
exho!"The number ${num} doubled is ${num * 2}!"
This now looks more like "normal" scripting than
writeln( mixin(interp!"The number ${num} doubled is ${num *
2}!") );
Maybe I'm overlooking something obvious, but I haven't been
able to find a way to change it to either a template mixin or
even just a plain template without sacrificing to whole point
of interpolated strings: specifying the arguments 100% inline.
What I think would be ideal is a language enhancement to allow
"interp" to do its job without the extra syntactical noise.
That would not only give us good interpolates strings, but
would likely have other applications as well.
I am not against the idea making string interpolations part of
the language, in vibe.d diet templates the extrapolation is
marked with #{var}, the ruby style, I like this too.
At the beginning I thought this is already part of d.
Regards mt.
