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########################################################################
##
## Copyright (C) 2009-2024 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{cstr}] =} ostrsplit (@var{s}, @var{sep})
## @deftypefnx {} {[@var{cstr}] =} ostrsplit (@var{s}, @var{sep}, @var{strip_empty})
## Split the string @var{s} using one or more separators @var{sep} and return
## a cell array of strings.
##
## Consecutive separators and separators at boundaries result in empty
## strings, unless @var{strip_empty} is true. The default value of
## @var{strip_empty} is false.
##
## 2-D character arrays are split at separators and at the original column
## boundaries.
##
## Example:
##
## @example
## @group
## ostrsplit ("a,b,c", ",")
## @result{}
## @{
## [1,1] = a
## [1,2] = b
## [1,3] = c
## @}
##
## ostrsplit (["a,b" ; "cde"], ",")
## @result{}
## @{
## [1,1] = a
## [1,2] = b
## [1,3] = cde
## @}
## @end group
## @end example
## @seealso{strsplit, strtok}
## @end deftypefn
function cstr = ostrsplit (s, sep, strip_empty = false)
if (nargin < 2)
print_usage ();
elseif (! ischar (s) || ! ischar (sep))
error ("ostrsplit: S and SEP must be string values");
elseif (! isscalar (strip_empty))
error ("ostrsplit: STRIP_EMPTY must be a scalar value");
endif
if (isempty (s))
cstr = cell (size (s));
else
if (rows (s) > 1)
## For 2-D arrays, add separator character at line boundaries
## and transform to single string
s(:, end+1) = sep(1);
s = reshape (s.', 1, numel (s));
s(end) = [];
endif
## Split s according to delimiter
if (isscalar (sep))
## Single separator
idx = find (s == sep);
else
## Multiple separators
idx = strchr (s, sep);
endif
## Get substring lengths.
if (isempty (idx))
strlens = length (s);
else
strlens = [idx(1)-1, diff(idx)-1, numel(s)-idx(end)];
endif
## Remove separators.
s(idx) = [];
if (strip_empty)
## Omit zero lengths.
strlens = strlens(strlens != 0);
endif
## Convert!
cstr = mat2cell (s, 1, strlens);
endif
endfunction
%!assert (ostrsplit ("road to hell", " "), {"road", "to", "hell"})
%!assert (ostrsplit ("road to^hell", " ^"), {"road", "to", "hell"})
%!assert (ostrsplit ("road to--hell", " -", true), {"road", "to", "hell"})
%!assert (ostrsplit (char ("a,bc", ",de"), ","),
%! {"a", "bc", char(ones(1,0)), "de "})
%!assert (ostrsplit (char ("a,bc", ",de"), ",", true), {"a", "bc", "de "})
%!assert (ostrsplit (char ("a,bc", ",de"), ", ", true), {"a", "bc", "de"})
## Test input validation
%!error <Invalid call> ostrsplit ()
%!error ostrsplit ("abc")
%!error ostrsplit ("abc", "b", true, 4)
%!error <S and SEP must be string values> ostrsplit (123, "b")
%!error <S and SEP must be string values> ostrsplit ("abc", 1)
%!error <STRIP_EMPTY must be a scalar value> ostrsplit ("abc", "def", ones (3,3))
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