Mercurial > octave
view scripts/strings/strchr.m @ 27923:bd51beb6205e
update formatting of copyright notices
* Use <https://octave.org/copyright/> instead of
<https://octave.org/COPYRIGHT.html/>.
* For consistency with other comments in the Octave sources, use
C++-style comments for copyright blocks in C and C++ files.
* Use delimiters above and below copyright blocks that are appropriate
for the language used in the file.
* Eliminate extra spacing inside copyright blocks.
* lex.ll (looks_like_copyright): Also allow newlines and carriage
returns before the word "Copyright".
* scripts/mk-doc.pl (gethelp): Also skip empty comment lines.
* bp-table.cc, type.m: Adjust tests.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Wed, 08 Jan 2020 11:59:41 -0500 |
parents | 1891570abac8 |
children | 89f3e53e9723 |
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######################################################################## ## ## Copyright (C) 2008-2020 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{idx} =} strchr (@var{str}, @var{chars}) ## @deftypefnx {} {@var{idx} =} strchr (@var{str}, @var{chars}, @var{n}) ## @deftypefnx {} {@var{idx} =} strchr (@var{str}, @var{chars}, @var{n}, @var{direction}) ## @deftypefnx {} {[@var{i}, @var{j}] =} strchr (@dots{}) ## Search for the string @var{str} for occurrences of characters from ## the set @var{chars}. ## ## The return value(s), as well as the @var{n} and @var{direction} arguments ## behave identically as in @code{find}. ## ## This will be faster than using regexp in most cases. ## ## @seealso{find} ## @end deftypefn function varargout = strchr (str, chars, varargin) if (nargin < 2) print_usage (); elseif (! ischar (str)) error ("strchr: STR argument must be a string or string array"); elseif (! ischar (chars)) error ("strchr: CHARS argument must be a string"); endif if (isempty (chars)) mask = false (size (str)); elseif (length (chars) <= 4) ## With a few characters, it pays off to build the mask incrementally. ## We do it via a for loop to save memory. mask = str == chars(1); for i = 2:length (chars) mask |= str == chars(i); endfor else ## Index the str into a mask of valid values. ## This is slower than it could be because of the +1 issue. f = false (256, 1); f(uint8 (chars) + 1) = true; ## Default goes via double -- unnecessarily long. si = uint32 (str); ## in-place is faster than str+1 ++si; mask = reshape (f(si), size (str)); endif varargout = cell (1, nargout); varargout{1} = []; [varargout{:}] = find (mask, varargin{:}); endfunction %!assert (strchr ("Octave is the best software", ""), zeros (1,0)) %!assert (strchr ("Octave is the best software", "best"), [3, 6, 9, 11, 13, 15, 16, 17, 18, 20, 23, 27]) %!assert (strchr ("Octave is the best software", "software"), [3, 4, 6, 9, 11, 13, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26, 27]) ## Test input validation %!error strchr () %!error strchr (1) %!error <STR argument must be a string> strchr (1, "aeiou") %!error <CHARS argument must be a string> strchr ("aeiou", 1)