Hi Matthew,

The catch is that there's a bunch of other stuff in the `Block`. 

That is, the special token is some substring of `s`

f :: Block -> Block 
f (CodeBlock _ s) = RawBlock (Format "latex")  ("\\MySpecialToken{" ++ s ++ 
"}") 
f b = b 

and I don't want to lose that. So I can write a function 

    f :: Block -> [Block]

where each CodeBlock is expanded into a list of :

  `RawBlock (Format "latex")` of the kind above,
  and the remaining, unchanged CodeBlock

But that causes problems with toJSONFilter as I can't pass in a 
transformation of the form 

   [Block] -> [Block]

Because there is no instance of Walkable for [Block] ... :(

On Saturday, January 17, 2015 at 3:06:04 PM UTC-8, Matthew Pickering wrote:
>
> You can write a filter ... f :: Block -> Block and have something like 
> the following. 
>
> f :: Block -> Block 
> f (CodeBlock _ s) = RawBlock (Format "latex")  ("\\MySpecialToken{" ++ s 
> ++ "}") 
> f b = b 
>
> Do you also plan to output to other formats? If so then "toJSONFilter" 
> can take a function of type "f :: Maybe Format -> Block -> Block" 
> where the first argument is the output format. 
>
> Does that make sense? 
>
> On Sat, Jan 17, 2015 at 9:05 PM, Ranjit Jhala <rjh...-fWt/sZ2FBdz2fBVCVOL8/A@public.gmane.org 
> <javascript:>> wrote: 
> > Hi, 
> > 
> > I'd like to write a filter that runs on `CodeBlock` such that each 
> > identifier that begins 
> > with (say) "$$$mytoken" gets rendered in latex not as a 
> > 
> >     \NormalTok{$$$mytoken} 
> > 
> > but as 
> > 
> >     \MySpecialToken{$$$mytoken} 
> > 
> > Can anyone give me a hint as to how to proceed? The stumbling block is 
> that 
> > it seems like 
> > the filter should "preserve" the type, so I can write a 
> > 
> >     myFilter :: CodeBlock -> CodeBlock 
> > 
> > But the `CodeBlock` type only allows strings -- presumably just 
> replacing 
> > (substrings) of the form 
> > 
> >     $$$mytoken 
> > 
> > with 
> > 
> >    \MySpecialToken{$$$mytoken} 
> > 
> > will only cause the latter to then get "escaped" out during the final 
> latex 
> > conversion? 
> > 
> > Any pointers would be most welcome! 
> > 
> > Thanks! 
> > 
> > - Ranjit. 
> > 
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