[m-users.] DCGs: equivalent of Prolog's phrase/2 and phrase/3 predicates?

[Volker Wysk]

Am Samstag, den 08.05.2021, 16:58 +0100 schrieb Sean Charles
(emacstheviking):
> Before setting off to the tattoo parlour I made one small change to keep it more ‘DCG’, I removed {true} and put in [] instead./..
> 
> skip_ws -->
>     ( if   ([' '];['\t'])
>       then skip_ws
>       else []
>     ).
> 
> Nice work though!

The effect of Prolog-cuts can often be achieved with if-then-else.

Volker
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