53 lines
1.3 KiB
Prolog
53 lines
1.3 KiB
Prolog
/*
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$Header$
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@author Nikolai van Kempen
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Provides access to the ../bin/ProgressConstants.csv values.
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Note: Won't distinguishing between the standalone and the client/server mode (but intendedly!).
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*/
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/*
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Reads the csv file when
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- getProgressConstant is called the first time
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- after reloading this file and the first getProgressConsant call.
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*/
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:- dynamic pcInit/1.
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pcInit(true).
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pcInit :-
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File='../bin/ProgressConstants.csv',
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% With the options functor(progressConsant), arity(5), match_arity(false)
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% it is possible to assert the facts directly, but then you need to
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% retract the header value...
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csv_read_file(File, Rows, [strip(true)]),
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retractall(progressConstant(_, _, _, _, _)),
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Rows=[_HeaderRow|Rest],
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assertProgressConstants(Rest),
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retractall(pcInit(_)).
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assertProgressConstants([]) :-
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!.
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assertProgressConstants([R|Rest]) :-
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assertProgressConstants(Rest),
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R=..[_|Args],
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Args=[Algebra, Operator, Constant, Value, Unit|_],
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asserta(progressConstant(Algebra, Operator, Constant, Value, Unit)),
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!.
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getProgressConstant(_, _, _, _) :-
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pcInit(true),
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ensure(pcInit, 'failed to load the progressConstants'),
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retractall(pcInit(true)),
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fail.
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getProgressConstant(Algebra, Operator, Constant, Value) :-
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progressConstant(Algebra, Operator, Constant, Value, _),
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!.
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% eof
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