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########################################################################
##
## Copyright (C) 2019-2024 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## This file is part of Octave.
##
## Octave is free software: you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, see
## <https://www.gnu.org/licenses/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {} mustBeMember (@var{x}, @var{valid})
##
## Require that input @var{x} is a member of a set of given valid values.
##
## Raise an error if any element of the input @var{x} is not a member
## of the set @var{valid}, as determined by @code{ismember (@var{x})}.
##
## Programming Note: char inputs may behave strangely because of the
## interaction between chars and cellstrings when calling @code{ismember} on
## them. But it will probably "do what you mean" if you just use it naturally.
## To guarantee operation, convert all char arrays to cellstrings with
## @code{cellstr}.
##
## @seealso{mustBeNonempty, ismember}
## @end deftypefn
function mustBeMember (x, valid)
if (nargin != 2)
print_usage ();
endif
tf = ! (ismember (x, valid))(:);
if (any (tf))
label = inputname (1);
if (isempty (label))
label = "input";
endif
n_bad = numel (find (tf));
## FIXME: Fancy inclusion of bad_val & valid values in the error message.
## Probably use mat2str() in a try/catch for that.
error ("%s must be one of the specified valid values; found %d elements that were not", ...
label, n_bad);
endif
endfunction
%!test
%! mustBeMember (42, 38:50);
%! mustBeMember ("foo", {"foo", "bar", "baz"});
%! mustBeMember (38:42, 37:43);
%! mustBeMember ({"foo","bar"}, {"foo", "bar", "baz"});
%!error <Invalid call> mustBeMember ()
%!error <Invalid call> mustBeMember (1)
%!error <called with too many inputs> mustBeMember (1, 2, 3)
%!error <found 1 elements> mustBeMember ([1, 42], 1:5)
%!error <found 1 elements> mustBeMember ("nope", {"foo", "bar", "baz"})
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