[Ur] A direction for Ur/Web

[Adam Chlipala]

Karn Kallio wrote:
>> What about a wiki page ? SASS/HAML could be implemented as well. It looks
>> like it doesn't make sense to implement all features of haml-lang.com.
>> But most of its syntax is much nicer to write.
>>      
> I do not think that HAML or SASS add any abstractions that Ur/Web with a full
> CSS support would not already have.  So in that sense implementing them would
> not gain anything.  If Ur/Web gained a sort of a typed macro system allowing
> user level implementation of SASS/HAML as a syntactic DSL that would be really
> interesting.
>    

Why would a "macro system" be needed?  You can get a long way with 
string parsing.  See, for example, this HTML parser:
     http://hg.impredicative.com/meta/file/d05943db55e8/html.urs