Re: [Pyparsing] Newline-Sensitive Languages

[Evan H. <eva...@gm...>]

How about this:

from pyparsing import ParserElement, Literal
ParserElement.setDefaultWhitespaceChars(" \t\r\f\v")
newline = Literal("\n")

On Mon, Jul 10, 2017 at 2:40 PM, Eric Dilmore <eri...@gm...> wrote:

> What is the best way to create a newline-sensitive language (like Python
> itself)? I continually run into problems where the newlines are eaten by
> the automated whitespace-grabber, and I've found what I believe to be two
> working solutions:
>
> - Attach .setWhitespaceChars(' \t') to the end of all of the low-level
> parsers so that, when combined, they don't gobble up newlines.
> - Add White(' \t') between all low-level parsers, such that they eat
> non-newline whitespace but not the newlines.
>
> Neither one of these is particularly elegant. It would be nice if
> .setWhitespaceChars propagated down to children (like .ignore does), but I
> don't expect it to be changed anytime soon because it would break backwards
> compatibility pretty bad for anyone who was using either one of these
> methods of producing newline-dependent languages.
>
> Which of these two is preferable? Or, alternatively, is there an even
> better way that I haven't thought of yet?
>
> Thanks in advance!
>
> ------------------------------------------------------------
> ------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> _______________________________________________
> Pyparsing-users mailing list
> Pyp...@li...
> https://lists.sourceforge.net/lists/listinfo/pyparsing-users
>



-- 
“The true logic of this world is in the calculus of probabilities.” – James
Clerk Maxwell