1######################################################################## 2## 3## Copyright (C) 1996-2021 The Octave Project Developers 4## 5## See the file COPYRIGHT.md in the top-level directory of this 6## distribution or <https://octave.org/copyright/>. 7## 8## This file is part of Octave. 9## 10## Octave is free software: you can redistribute it and/or modify it 11## under the terms of the GNU General Public License as published by 12## the Free Software Foundation, either version 3 of the License, or 13## (at your option) any later version. 14## 15## Octave is distributed in the hope that it will be useful, but 16## WITHOUT ANY WARRANTY; without even the implied warranty of 17## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18## GNU General Public License for more details. 19## 20## You should have received a copy of the GNU General Public License 21## along with Octave; see the file COPYING. If not, see 22## <https://www.gnu.org/licenses/>. 23## 24######################################################################## 25 26## -*- texinfo -*- 27## @deftypefn {} {} strtrim (@var{s}) 28## Remove leading and trailing whitespace from @var{s}. 29## 30## If @var{s} is a matrix, @var{strtrim} trims each row to the length of 31## longest string. If @var{s} is a cell array of strings, operate recursively 32## on each string element. 33## 34## For example: 35## 36## @example 37## @group 38## strtrim (" abc ") 39## @result{} "abc" 40## 41## strtrim ([" abc "; " def "]) 42## @result{} ["abc " ; " def"] 43## @end group 44## @end example 45## @seealso{deblank} 46## @end deftypefn 47 48## This function was derived from deblank. 49 50function s = strtrim (s) 51 52 if (nargin != 1) 53 print_usage (); 54 endif 55 56 if (ischar (s)) 57 58 k = find (! isspace (s)); 59 if (isempty (s) || isempty (k)) 60 s = ""; 61 else 62 s = s(:, ceil (min (k) / rows (s)):ceil (max (k) / rows (s))); 63 endif 64 65 elseif (iscell (s)) 66 67 char_idx = cellfun ("isclass", s, "char"); 68 cell_idx = cellfun ("isclass", s, "cell"); 69 if (! all (char_idx | cell_idx)) 70 error ("strtrim: S argument must be a string or cellstring"); 71 endif 72 73 ## Divide work load. Recursive cellfun strtrim call is slow 74 ## and avoided where possible. 75 s(char_idx) = regexprep (s(char_idx), "^[\\s\v]+|[\\s\v]+$", ''); 76 s(cell_idx) = cellfun ("strtrim", s(cell_idx), "UniformOutput", false); 77 78 else 79 error ("strtrim: S argument must be a string or cellstring"); 80 endif 81 82endfunction 83 84 85%!assert (strtrim (" abc "), "abc") 86%!assert (strtrim (" "), "") 87%!assert (strtrim ("abc"), "abc") 88%!assert (strtrim (char (" abc ", " def ")), ["abc "; " def"]) 89%!assert (strtrim ({" abc "; " def "}), {"abc"; "def"}) 90%!assert (strtrim ({" abc ", {" def "}}), {"abc", {"def"}}) 91 92%!error <Invalid call to strtrim> strtrim () 93%!error <Invalid call to strtrim> strtrim ("abc", "def") 94%!error <argument must be a string> strtrim (1) 95%!error <argument must be a string> strtrim ({[]}) 96