Why is std.regex slow, well here is one reason!

[Richard (Rikki) Andrew Cattermole]

On 24/02/2023 12:11 PM, Walter Bright wrote:
> On 2/23/2023 12:50 PM, Richard (Rikki) Andrew Cattermole wrote:
>> Everything about std.uni and its tables is about tradeoffs. It is 
>> designed to be opt-in and to be small in binary. If you didn't care 
>> about binary sizes it would be easy enough to have it all in ROM ready 
>> to go, but it'll be over 8mb if you did that (mine is).
> 
> Another way is to generate the tables into a separate file when Phobos 
> is built, and import that file.

We already do this. But instead we just commit the generated files, 
which is a lot better than not having to modify them by hand... *shudder*

>> On that note, I recently looked at Unicode symbols for identifiers; we 
>> can shrink the is alpha LUT in dmd to ~1/9th its current size by 
>> updating to C11 :)
> 
> Let's do it!

I probably should've looked at C23 draft spec to see how they were doing 
it before saying something like this. Because they are not doing the 
ranges anymore. Its a lot more complicated with TR31.

https://open-std.org/JTC1/SC22/WG14/www/docs/n3054.pdf

This will be in the realm of a rewrite I think and certainly DIP 
territory (guess I'm on it for the export/symbol/shared library DIP).

That DIP keeps getting larger and larger... with same scope, who knew 
those innocent looking symbols, all in their tables could be so complicated!