# Re: [NTG-context] BNF grammar for ConTeXt (was: What happened with sectionworld?)

On Thu, 30 Apr 2009 09:48:40 +0200
luigi scarso <luigi.sca...@gmail.com> scribit:

> R. Bastian:
>
> > CONTEXT_SOURCE ::= PREAMBLE "\starttext" TEXT "\stoptext" | CONTEXT_SOURCE
> >>>  TEXT ::= STARTSTOPS | SETUPS | DEFINES | OTHERS [ TEXT
> >>
> >> luigi:
>
> >   To be general, i think
> >>   MY_CONTEXT_SOURCE ::= MACRO* END
> >>
> >
> R. Bastian:
>
> > I dont understand the sense of "\end\starttext"
>
> sense==semantic
>
> "\end""\starttext" is a valid string for a hypothetical  bnf grammar of
> ContTeXt
> which is not valid for your bnf ;
> "\end""\starttext""\stoptext" is in your bnf grammar
> and has the same semantic of  "\end""\starttext" .
>
> The point is : a bnf for Context can be hard to define
>
>
>  luigi:
>
> think that a bnf or lpeg grammar is really useful for a sort of
> >> standard-ConTeXt
> >> or minimal-ConTeXt or light-ConTeXt
> >> ie a ConTeXt to use as "reference"
> >>
> >
> R. Bastian:
>
> > Exactly what I need : standard, minimal and light
> >
>
> Exactly what can be hard to define and capture in a bnf .
>
> wolfgang
>
> >
> > How could a BNF grammar help to learn ConTeXt,
>
> a bnf can help to build a syntax checker, a highlighter etc.
> Actually the only way to say that you have a valid ConTeXt string
> is running context on that string .
>
> The semantic is another story.

OK - but isn't it not worth to try it ?
>
> --
> luigi

___________________________________________________________________________________