phrase_from_file does not work on Windows

[PatrickSkowronek]

Hello everyone,

currently I'm working on parser with DCG. With phrase and taking every single line it's working perfectly, but with phrase_from_file it does not work. Neither does these examples http://www.pathwayslms.com/swipltuts/dcg/#anch6 or https://www.metalevel.at/prolog/dcg .
Unfortunately I can't test it on Linux, on Windows with 8.0.2 it is not working.

Kind regards Patrick

[JanWielemaker]

Seems quite unikely. Only some parts of this tutorial may need to be adjusted for SWI-Prolog version 7 and later (http://www.swi-prolog.org/pldoc/man?section=strings), but not phrase_from_file/2,3. Please continue this at the forum and include exactly what you did as it is probably some minor detail.

[PatrickSkowronek]

I followed @Anniepoo tutorial of DGC. I tried this code to test phrase_from_file :

:- set_prolog_flag(double_quotes, chars).
:- use_module(library(pio)).
:- use_module(library(dcg/basics)).

runDGC:- phrase_from_file(like(What), 'like.txt'), writeln(What).

like(What) --> "I like ", list(What), ".", list(_).

list([]) --> [].
list([L|Ls]) --> [L], list(Ls).

The text file contains "I like it." and the path is set correct. I consulted the file on a fresh console and there is no prolog flag for double quotes in my init file.

[JanWielemaker]

phrase_from_file/3 doesn't work with :- set_prolog_flag(double_quotes, chars).. In fact, little except for some toy things do. If you want to discuss why, please use the forum.

[PatrickSkowronek]

Thanks for the answer. After removing the :- set_prolog_flag(double_quotes, chars). it worked. I checked, the second example recommend using it.

[AnnieAtHasura]

my bad, filed
Anniepoo/swipldcgtut#18

[PatrickSkowronek]

Sry @AnnieAtHasura the second example is from @triska .