Streaming parsers in D a novel design

[Jacob Shtokolov]

On Tuesday, 18 April 2023 at 14:26:00 UTC, Sebastiaan Koppe wrote:
> On Tuesday, 18 April 2023 at 08:13:05 UTC, Dmitry Olshansky 
> wrote:
>> A streaming parser is doing 2 things:
>> - waiting for input
>> - processing the current input and spitting out Events
>
> I think it will work beautifully until the day you want to do 
> it asynchronously.

Ranges can be async, in this case, you just need to return the 
Result type (pending|error|success) and provide hints to 
something that will be pulling from this range.

It will look like an infinite range, but not fully infinite: it 
returns "success" once the result is ready.

The sync version will always return `error|success` without the 
'pending' phase.

That kind of interface is similar to Rust's futures, providing 
poll-based primitives with some wakeup hints (callbacks).