Pegged, a Parsing Expression Grammar (PEG) generator in D

[Philippe Sigaud]

On Sun, Mar 11, 2012 at 08:26, Andrei Alexandrescu
<SeeWebsiteForEmail at erdani.org> wrote:
> I, too, think this is very significant work! Suggestion for Philippe:
> instead of this:
>
>
> enum PEGCode = grammarCode!(
>     "Grammar <- S Definition+ EOI"
>    ,"Definition <- RuleName Arrow Expression"
>    ,"RuleName   <- Identifier>(ParamList?)"
>    ,"Expression <- Sequence (OR Sequence)*"
> );
>
> how about this:
>
> enum PEGCode = grammarCode!("
>    Grammar <- S Definition+ EOI;
>
>    Definition <- RuleName Arrow Expression;
>    RuleName   <- Identifier>(ParamList?);
>    Expression <- Sequence (OR Sequence)*;
> ");
>
> Splitting on ";" is trivial and makes client code considerably easier to
> play with.

It's already implemented! No need for ';'
The docs are up to date, the internal code also. It's only an old
bootstrapping file that Andrej cited that still contains multi-string
definitions. I'll correct that, as that means I didn"t push dogfooding
far enough.

Now, just use one string:

"Grammar <- ...
 Definition <- ...

"