root/tags/lgt291/library/listp.lgt

:- protocol(listp).


    :- info([
        version is 1.0,
        authors is 'Paulo Moura',
        date is 2000/7/24,
        comment is 'List protocol.']).


    :- public(append/3).

    :- mode(append(?list, ?list, ?list), zero_or_more).

    :- info(append/3, [
        comment is 'Appends two lists.',
        argnames is ['List1', 'List2', 'List']]).


    :- public(delete/3).

    :- mode(delete(+list, @term, ?list), one).

    :- info(delete/3,
        [comment is 'Deletes from a list all ocurrences of an element returning the list of remaining elements.',
         argnames is ['List', 'Element', 'Remaining']]).


    :- public(delete_matches/3).

    :- mode(delete_matches(+list, @term, ?list), one).

    :- info(delete_matches/3,
        [comment is 'Deletes all matching elements from a list, returning the list of remaining elements.',
         argnames is ['List', 'Element', 'Remaining']]).


    :- public(empty/1).

    :- mode(empty(@list), zero_or_one).

    :- info(empty/1,
        [comment is 'True if the argument is an empty list.',
         argnames is ['List']]).


    :- public(flatten/2).

    :- mode(flatten(+list, -list), one).

    :- info(flatten/2,
        [comment is 'Flattens a list of lists into a list.',
         argnames is ['List', 'Flatted']]).


    :- public(keysort/2).

    :- mode(keysort(+list, -list), one).

    :- info(keysort/2,
        [comment is 'Sorts a list of key-value pairs in ascending order.',
         argnames is ['List', 'Sorted']]).


    :- public(last/2).

    :- mode(last(?list, ?term), zero_or_more).

    :- info(last/2,
        [comment is 'List last element (if it exists).',
         argnames is ['List', 'Last']]).


    :- public(length/2).

    :- mode(length(?list, ?integer), zero_or_more).

    :- info(length/2,
        [comment is 'List length.',
         argnames is ['List', 'Length']]).


    :- public(max/2).

    :- mode(max(+list, -term), zero_or_one).

    :- info(max/2,
        [comment is 'Determines the list maximum value using standard order. Fails if the list is empty.',
         argnames is ['List', 'Maximum']]).


    :- public(member/2).

    :- mode(member(?term, ?list), zero_or_more).

    :- info(member/2,
        [comment is 'Element is a list member.',
         argnames is ['Element', 'List']]).


    :- public(memberchk/2).

    :- mode(memberchk(?term, ?list), zero_or_one).

    :- info(memberchk/2,
        [comment is 'Checks if a term is a member of a list.',
         argnames is ['Element', 'List']]).


    :- public(min/2).

    :- mode(min(+list, -term), zero_or_one).

    :- info(min/2,
        [comment is 'Determines the minimum value in a list using standard order. Fails if the list is empty.',
         argnames is ['List', 'Minimum']]).


    :- public(nth/3).

    :- mode(nth(?integer, +list, ?term), zero_or_more).

    :- info(nth/3, [
        comment is 'Nth element of a list.',
        argnames is ['Nth', 'List', 'Element']]).


    :- public(permutation/2).

    :- mode(permutation(?list, ?list), zero_or_more).

    :- info(permutation/2,
        [comment is 'The two lists are a permutation of the same list.',
         argnames is ['List', 'Permutation']]).


    :- public(prefix/2).

    :- mode(prefix(?list, +list), zero_or_more).

    :- info(prefix/2,
        [comment is 'Prefix is a prefix of List.',
         argnames is ['Prefix', 'List']]).


    :- public(reverse/2).

    :- mode(reverse(+list, ?list), zero_or_one).
    :- mode(reverse(?list, +list), zero_or_one).
    :- mode(reverse(-list, -list), one_or_more).

    :- info(reverse/2,
        [comment is 'Reverses a list.',
         argnames is ['List', 'Reversed']]).


    :- public(same_length/2).

    :- mode(same_length(+list, ?list), zero_or_one).
    :- mode(same_length(?list, +list), zero_or_one).
    :- mode(same_length(-list, -list), one_or_more).

    :- info(same_length/2,
        [comment is 'The two lists have the same length.',
         argnames is ['List1', 'List2']]).


    :- public(select/3).

    :- mode(select(?term, +list, ?list), zero_or_more).
    :- mode(select(?term, ?list, +list), zero_or_more).

    :- info(select/3,
        [comment is 'Selects an element from a list, returning the list of remaining elements.',
         argnames is ['Element', 'List', 'Remaining']]).


    :- public(sort/2).

    :- mode(sort(+list, -list), one).

    :- info(sort/2,
        [comment is 'Sorts a list in ascending order.',
         argnames is ['List', 'Sorted']]).


    :- public(sublist/2).

    :- mode(sublist(?list, +list), zero_or_more).

    :- info(sublist/2,
        [comment is 'The first list is a sublist of the second.',
         argnames is ['Sublist', 'List']]).


    :- public(subtract/3).

    :- mode(subtract(+list, +list, -list), one).

    :- info(subtract/3,
        [comment is 'Removes all elements in the second list from the first list, returning the list of remaining elements.',
         argnames is ['List', 'Elements', 'Remaining']]).


    :- public(suffix/2).

    :- mode(suffix(?list, +list), zero_or_more).

    :- info(suffix/2,
        [comment is 'Suffix is a suffix of List.',
         argnames is ['Suffix', 'List']]).


:- end_protocol.