Re: Help. invoke a swi-prolog program within an html page

From: Jan Wielemaker (jan_at_ct.xs4all.nl)
Date: 01/31/05

  • Next message: Maurizio Ferreira: "Re: Swi-Pce: text items too large" 
    Date: 31 Jan 2005 16:45:00 GMT

    On 2005-01-31, Norbert E. Fuchs <fuchs@ifi.unizh.ch> wrote:
    > In article <34j3dmF4b3e8rU1@individual.net>,
    > "Gustavo Rodas" <guaron@hotmail.com> wrote:
    >
    >> Hi,
    >>
    >> Can I invoke a SWI-Prolog program within an HTML program?
    >> If so, how can I pass input to the program and take
    >> output from it?
    >>
    >> Your help will be greatly appreciated.
    >
    >
    > Have a look at the Pillow Web Programming Library
    >
    > http://www.clip.dia.fi.upm.es/Software/pillow/pillow_doc_html/pillow_doc_
    > toc.html
    >
    > where it says
    >
    > The PiLLoW library ("Programming in Logic Languages on the Web") is a
    > public domain Internet/WWW programming library for Logic Programming
    > Systems which simplifies the process of writing applications for such
    > environment. The library provides facilities for generating HTML or XML
    > structured documents by handling them as Herbrand terms, producing HTML
    > forms, writing form handlers, processing HTML templates, accessing and
    > parsing WWW documents (either HTML or XML), accessing code posted at
    > HTTP addresses, etc.

    Pillow is one way. SWI-Prolog itself comes with libraries too. Only,
    the question is much underspecified. First of all, I don't think you
    can speak about `An HTML program'. That would imply it is a programming
    language. Its not even Turing complete. What does invoke a (SWI-)Prolog
    program from HTML mean? In my reading javascript and other client-side
    embedded code could be called `invoking XYZ'. I do not know whether
    Pillow provides server-side embedded Prolog (like PHP for example).
    I once wrote that (it still runs the SWI-Prolog application DB), but
    never documented it.

    Things that can be done is to use Prolog as a CGI scripting language.
    There is nothing special here. To make it easy there is a library for
    fetching CGI form data (see package clib). You can also server the
    pages directly from Prolog using the HTTP package. This also contains
    a library `handling them as Herbrand terms': html_write.pl. I'm still
    not sure this is ideal. From a software design point of view it is
    the way to go, I guess. Especially novices prefer using format (or
    even write) though and it takes a lot of effort to convince them
    otherwise.

            Cheers --- Jan

  • Next message: Maurizio Ferreira: "Re: Swi-Pce: text items too large"

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