Re: [Pyparsing] Newline-Sensitive Languages

[Eric D. <eri...@gm...>]

That looks like it should work! I tried something like that earlier but
couldn't quite get it working right, but I think it had to do with
namespace issues more than anything.

On 11 Jul 2017 12:43 am, "Evan Hubinger" <eva...@gm...> wrote:

> 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!
>>
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>
>
>
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