Improving ddoc

[Walter Bright via Digitalmars-d]

On 1/1/2015 1:47 AM, Andrei Alexandrescu wrote:
> Stars and underlines are popular due to markdown. There'd be limitations, e.g.
> pairs occurring across a ddoc parent won't be considered for expansion etc. Also
> the defaults can be written to be idempotent. (Below I am removing the single
> quote because indeed it's not fitting):
>
> BACKQUOTED=`$0`
> QUOTED="$0"
> UNDERLINED=_$0_
> STARRED=*$0*
>
> So essentially we get to start 100% backward compatible and figure out under
> what circumstances the macros expand. I think we can get this working.

Ddoc assumes ( ) nests. But this would require that these characters nest, too:

    *abc_def * _i

for example, which is stretching things a bit because they do not naturally nest.