Mercurial > octave-antonio
view scripts/strings/strtrim.m @ 20166:196871335aa8
Allow call with empty argument list in strcat related functions (bug #44981)
* libinterp/corefcn/strfns.cc (strvcat): return an empty string for an empty
argument list. Simply dropping the input checking, will return an empty
string. This makes it more consistent with cat(), vertcat, and horzcat()
functions, which return [] for this cases. It makes it easier to support
"strcat (cell{:})" when cell is empty.
* scripts/strings/cstrcat.m, scripts/strings/strcat.m: same as above. But
because [cellstr{:}] when cellstr is empty returns double ([]), we
specifically return "".
author | Carnë Draug <carandraug@octave.org> |
---|---|
date | Fri, 01 May 2015 16:21:39 +0100 |
parents | 4197fc428c7d |
children | df437a52bcaf |
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## Copyright (C) 1996-2015 Kurt Hornik ## ## 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 ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {} 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 ## Author: John Swensen <jpswensen@jhu.edu> ## 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 ([" abc "; " def "]), ["abc "; " def"]) %!assert (strtrim ({" abc "; " def "}), {"abc"; "def"}) %!assert (strtrim ({" abc ", {" def "}}), {"abc", {"def"}}) %!error <Invalid call to strtrim> strtrim () %!error <Invalid call to strtrim> strtrim ("abc", "def") %!error <argument must be a string> strtrim (1) %!error <argument must be a string> strtrim ({[]})