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########################################################################
##
## Copyright (C) 1996-2024 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 {} {@var{s} =} strtrim (@var{s})
## Remove leading and trailing whitespace from @var{s}.
##
## If @var{s} is a matrix, @var{strtrim} trims each row to the length of
## longest string. If @var{s} is a cell array of strings, operate recursively
## on each string element.
##
## For example:
##
## @example
## @group
## strtrim (" abc ")
## @result{} "abc"
##
## strtrim ([" abc "; " def "])
## @result{} ["abc " ; " def"]
## @end group
## @end example
## @seealso{deblank}
## @end deftypefn
## This function was derived from deblank.
function s = strtrim (s)
if (nargin < 1)
print_usage ();
endif
if (ischar (s))
k = find (! isspace (s));
if (isempty (s) || isempty (k))
s = "";
else
s = s(:, ceil (min (k) / rows (s)):ceil (max (k) / rows (s)));
endif
elseif (iscell (s))
char_idx = cellfun ("isclass", s, "char");
cell_idx = cellfun ("isclass", s, "cell");
if (! all (char_idx | cell_idx))
error ("strtrim: S argument must be a string or cellstring");
endif
## Divide work load. Recursive cellfun strtrim call is slow
## and avoided where possible.
s(char_idx) = regexprep (s(char_idx), "^[\\s\v]+|[\\s\v]+$", '');
s(cell_idx) = cellfun ("strtrim", s(cell_idx), "UniformOutput", false);
else
error ("strtrim: S argument must be a string or cellstring");
endif
endfunction
%!assert (strtrim (" abc "), "abc")
%!assert (strtrim (" "), "")
%!assert (strtrim ("abc"), "abc")
%!assert (strtrim (char (" abc ", " def ")), ["abc "; " def"])
%!assert (strtrim ({" abc "; " def "}), {"abc"; "def"})
%!assert (strtrim ({" abc ", {" def "}}), {"abc", {"def"}})
%!error <Invalid call to strtrim> strtrim ()
%!error <called with too many inputs> strtrim ("abc", "def")
%!error <argument must be a string> strtrim (1)
%!error <argument must be a string> strtrim ({[]})
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