Re: Conditional includes...
Sean Charles <[email protected]>
| Newsgroups | gmane.comp.gnu.prolog.general |
|---|---|
| Message-ID | <[email protected]> |
Damn! I only recently learned about predicate indicators from Daniel and I guess it’s not ingrained enough yet. I did what you posted and it works! My “./tests/runalltests” script works once again as does my up-one-level and I learned some more to boot! You are never too old to learn and I never stop! In precisely 1 hour and 12 minutes UK time I shall be 48 years old, so that’s 29 years in the business and 37 years since I learned BASIC in school and I am still hooked on “what is computing”. Good night everybody and thanks again Paulo, finally you told me something I understood! ;) Cheers, Sean. On 9 Nov 2013, at 22:38, Paulo Moura <[email protected]> wrote: > > On 09/11/2013, at 22:30, Sean Charles <[email protected]> wrote: > >> I am having troubles with files being included more than once and I don’t seem to be able to code my away around it! >> >> In my utils.pl file I have a predicate called now_string() and I have application code and test scripts that use it and now, after refactoring, my test scripts break because none of the files under test are pulling it in… I removed it from one file because that file was being included in another file yadda yadda yadaa you know how these things get from time to time. >> >> I thought I could put in a test like this: >> >> :-if( \+ current_predicate(utils_included)). >> :-include('utils.pl'). >> :-endif. >> >> But it won’t play ball. In the utils.pl file the first fact is “utils_included.” I hope you get the picture, problem is, gprolog doesn’t! >> >> compiling /Users/seancharles/Documents/FELT/felt-prolog/feltlexer.pl for byte code... >> /Users/seancharles/Documents/FELT/felt-prolog/feltlexer.pl:38:1: syntax error: . or operator expected after expression >> /Users/seancharles/Documents/FELT/felt-prolog/feltlexer.pl:39: fatal error: unexpected endif directive >> >> Is there an “accepted technique” for handling file included in Prolog applications to avoid multiple definitions and things? > > Try: > > :- if(\+ current_predicate(utils_included/0)). > :- initialization(consult('utils.pl')). > :- endif. > > The initialization/1 is deferred until the file is loaded so you shouldn't get an error related to a missing endif/0 directive that, I assumed is that to some implementation issue with the include/1 directive. Also note that current_predicate/1 takes (or returns) a predicate indicator as argument, not a predicate functor. > > Cheers, > > Paulo > > ----------------------------------------------------------------- > Paulo Moura > Logtalk developer > > Email: <mailto:[email protected]> > Web: <http://logtalk.org/> > ----------------------------------------------------------------- > > > > > > _______________________________________________ > Users-prolog mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/users-prolog _______________________________________________ Users-prolog mailing list [email protected] https://lists.gnu.org/mailman/listinfo/users-prolog