Article View: comp.lang.prolog
Article #2045Re: converting ascii character lists to functors
From: Scott Notenberg 8792
Date: Sat, 20 Apr 1991 21:14
Date: Sat, 20 Apr 1991 21:14
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2103 bytes
eiverson@nmsu.edu (Eric Iverson) writes:
>I called today about converting ascii character lists into functors
>which could be unified with other functors. I need to do this because
>I need to use a character based read function for my file I/O.
>| ?- name('loves(John,Mary,John)',X),functor_chars(F,X).
>X = [108,111,118,101,115,40,74,111,104,110,44,77,97,114,121,44,74,111,104,110,41],
>F = loves(_3569,_3590,_3569) ;
>------------------------------------------------------------------------
>Eric Iverson Internet: eiverson@nmsu.edu
ASSUMPTION:
The predicate concat(A,B,AB) is available for symbols (quoted strings).
Why not simply do the following...
?- name('loves(John,Mary,John)',X), collectUntil(X,40,F) which concats
characters (recursively backwards so functor name isn't backwards)
to an Accumulator until the ascii '40' is found from the list X.
This should work, but who knows I don't use Quintus.
Hope this helps...
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Newsgroups: comp.lang.prolog Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!van-bc!ubc-cs!news.UVic.CA!sanjuan!notscott From: notscott@sanjuan (Scott Notenberg 8792) Subject: Re: converting ascii character lists to functors Message-ID: <notscott.672182060@sanjuan> Sender: news@sol.UVic.CA Nntp-Posting-Host: sanjuan.uvic.ca Organization: University of Victoria References: <EIVERSON.91Apr19200202@aigyptos.nmsu.edu> Distribution: comp Date: 20 Apr 91 21:14:20 GMT