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########################################################################
##
## Copyright (C) 2000-2022 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/>.
##
########################################################################
## Validate arguments for binary set operation.
function [x, y] = validsetargs (caller, x, y, varargin)
isallowedarraytype = @(x) isnumeric (x) || ischar (x) || islogical (x);
if (nargin == 3)
icx = iscellstr (x);
icy = iscellstr (y);
if (icx || icy)
if (icx && ischar (y))
y = cellstr (y);
elseif (icy && ischar (x))
x = cellstr (x);
elseif (icy && isempty (x))
x = {};
elseif (icx && isempty (y))
y = {};
elseif (! (icx && icy))
error ("%s: cell array of strings cannot be combined with a nonstring value", caller);
endif
elseif (! (isallowedarraytype (x) && isallowedarraytype (y)))
error ("%s: A and B must be arrays or cell arrays of strings", caller);
endif
else
optlegacy = false;
optsorted = false;
optstable = false;
for arg = varargin
switch (arg{1})
case "legacy"
optlegacy = true;
case "rows"
if (iscell (x) || iscell (y))
error ('%s: cells not supported with "rows" flag', caller);
elseif (! (isallowedarraytype (x) && isallowedarraytype (y)))
error ("%s: A and B must be arrays or cell arrays of strings", caller);
else
if (ndims (x) > 2 || ndims (y) > 2)
error ('%s: A and B must be 2-dimensional matrices with "rows" flag', caller);
elseif (columns (x) != columns (y) && ! (isempty (x) || isempty (y)))
error ("%s: number of columns in A and B must match", caller);
endif
endif
case "sorted"
optsorted = true;
case "stable"
optstable = true;
otherwise
error ("%s: invalid option: %s", caller, arg{1});
endswitch
endfor
if (optsorted + optstable + optlegacy > 1)
error ('%s: only one of "sorted", "stable", or "legacy" may be specified',
caller);
endif
endif
endfunction
## BIST tests for function are in union.m
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