117 lines
2.1 KiB
Prolog
117 lines
2.1 KiB
Prolog
:- module(line_utils,
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[search_for/2,
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search_for/3,
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scan_natural/3,
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scan_integer/3,
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split/2,
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split/3,
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glue/3,
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copy_line/2,
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filter/3,
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file_filter/3,
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process/2
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]).
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:- meta_predicate filter(+,+,:), file_filter(+,+,:), process(+,:).
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:- use_module(library(lists),
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[member/2,
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append/3]).
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:- use_module(library(readutil),
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[read_line_to_codes/2]).
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search_for(C,L) :-
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search_for(C, L, []).
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search_for(C) --> [C], !.
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search_for(C) --> [_],
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search_for(C).
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scan_integer(N) -->
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"-", !,
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scan_natural(0, N0),
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N is -N0.
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scan_integer(N) -->
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scan_natural(0, N).
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scan_natural(N) -->
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scan_natural(0, N).
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scan_natural(N0,N) -->
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[C],
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{C >= 0'0, C =< 0'9 }, !,
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{ N1 is N0*10+(C-0'0) }, %'
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get_natural(N1,N).
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scan_natural(N,N) --> [].
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split(String, Strings) :-
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split_at_blank(" ", Strings, String, []).
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split(String, SplitCodes, Strings) :-
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split_at_blank(SplitCodes, Strings, String, []).
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split_at_blank(SplitCodes, More) -->
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[C],
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{ member(C, SplitCodes) }, !,
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split_at_blank(SplitCodes, More).
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split_at_blank(SplitCodes, [[C|New]| More]) -->
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[C], !,
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split(SplitCodes, New, More).
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split_at_blank(_, []) --> [].
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split(SplitCodes, [], More) -->
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[C],
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{ member(C, SplitCodes) }, !,
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split_at_blank(SplitCodes, More).
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split(SplitCodes, [C|New], Set) -->
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[C], !,
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split(SplitCodes, New, Set).
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split(_, [], []) --> [].
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glue([], _, []).
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glue([A], _, A) :- !.
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glue([H|T], [B|_], Merged) :-
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append(H, [B|Rest], Merged),
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glue(T, [B], Rest).
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copy_line(StreamInp, StreamOut) :-
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read_line_to_codes(StreamInp, Line),
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format(StreamOut, '~s~n', [Line]).
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filter(StreamInp, StreamOut, Command) :-
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repeat,
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read_line_to_codes(StreamInp, Line),
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(
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Line == end_of_file
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->
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true
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;
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call(Command, Line, NewLine),
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format(StreamOut, '~s~n', [NewLine]),
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fail
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).
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process(StreamInp, Command) :-
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repeat,
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read_line_to_codes(StreamInp, Line),
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(
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Line == end_of_file
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->
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true
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;
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call(Command, Line),
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fail
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).
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file_filter(Inp, Out, Command) :-
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open(Inp, read, StreamInp),
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open(Out, write, StreamOut),
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filter(StreamInp, StreamOut, Command),
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close(StreamInp),
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close(StreamOut).
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