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Revision 4601, 0.8 KB
(checked in by pmoura, 7 weeks ago)
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Added svn:mime-type property to source files (set to text/x-logtalk).
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Property svn:mime-type set to
text/x-logtalk
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Property svn:eol-style set to
native
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Property svn:keywords set to
Author Date Id Revision
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| 1 | |
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| 2 | :- object(reverse). |
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| 3 | |
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| 4 | |
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| 5 | :- info([ |
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| 6 | version is 1.0, |
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| 7 | author is 'Paulo Moura', |
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| 8 | date is 2004/2/16, |
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| 9 | comment is 'Reads and writes a simple table of facts from and to files for testing operator handling code.']). |
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| 10 | |
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| 11 | :- op(500, xfx, next). % local object operators, not visible outside this object |
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| 12 | :- op(500, xfx, previous). |
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| 13 | |
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| 14 | :- initialization(reverse_file). |
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| 15 | |
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| 16 | |
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| 17 | reverse_file :- |
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| 18 | open('next.txt', read, RStream), |
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| 19 | open('previous.txt', write, WStream), |
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| 20 | read(RStream, Term), % local operators are used when reading terms ... |
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| 21 | process(Term, RStream, WStream). |
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| 22 | |
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| 23 | process(end_of_file, RStream, WStream) :- |
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| 24 | close(RStream), |
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| 25 | close(WStream). |
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| 26 | |
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| 27 | process(X next Y, RStream, WStream) :- |
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| 28 | write(WStream, Y previous X), % ... and when writing terms |
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| 29 | write(WStream, '.'), nl(WStream), |
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| 30 | read(RStream, Next), |
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| 31 | process(Next, RStream, WStream). |
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| 32 | |
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| 33 | |
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| 34 | :- end_object. |
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