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annotate scripts/strings/strtrim.m @ 17428:577a19afdaf5

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maint: Backed out changeset f81401b6b1f7. * test/parser.tst: bug #33304 should remain an error until it is fixed.
author Rik <rik@octave.org>
date Sat, 14 Sep 2013 17:07:05 -0700
parents f3d52523cde1
children
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72c96de7a403 maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1996-2012 Kurt Hornik
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} strtrim (@var{s})
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21 ## Remove leading and trailing whitespace from @var{s}. If
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22 ## @var{s} is a matrix, @var{strtrim} trims each row to the length of
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23 ## longest string. If @var{s} is a cell array of strings, operate recursively
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24 ## on each string element. For example:
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25 ##
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26 ## @example
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27 ## @group
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28 ## strtrim (" abc ")
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29 ## @result{} "abc"
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30 ##
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31 ## strtrim ([" abc "; " def "])
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32 ## @result{} ["abc " ; " def"]
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33 ## @end group
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34 ## @end example
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35 ## @seealso{deblank}
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36 ## @end deftypefn
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37
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38 ## Author: John Swensen <jpswensen@jhu.edu>
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39
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40 ## This function was derived from deblank.
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41
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42 function s = strtrim (s)
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43
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44 if (nargin != 1)
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45 print_usage ();
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46 endif
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47
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48 if (ischar (s))
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49
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50 k = find (! isspace (s));
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51 if (isempty (s) || isempty (k))
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52 s = "";
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53 else
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54 s = s(:, ceil (min (k) / rows (s)):ceil (max (k) / rows (s)));
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55 endif
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56
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57 elseif (iscell (s))
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58
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59 char_idx = cellfun ("isclass", s, "char");
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60 cell_idx = cellfun ("isclass", s, "cell");
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61 if (! all (char_idx | cell_idx))
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62 error ("strtrim: S argument must be a string or cellstring");
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63 endif
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64
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65 ## Divide work load. Recursive cellfun strtrim call is slow
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66 ## and avoided where possible.
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67 s(char_idx) = regexprep (s(char_idx), "^[\\s\v]+|[\\s\v]+$", '');
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68 s(cell_idx) = cellfun ("strtrim", s(cell_idx), "UniformOutput", false);
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69
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70 else
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71 error ("strtrim: S argument must be a string or cellstring");
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72 endif
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73
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74 endfunction
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76
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77 %!assert (strtrim (" abc "), "abc")
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78 %!assert (strtrim (" "), "")
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79 %!assert (strtrim ("abc"), "abc")
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80 %!assert (strtrim ([" abc "; " def "]), ["abc "; " def"])
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81 %!assert (strtrim ({" abc "; " def "}), {"abc"; "def"})
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82 %!assert (strtrim ({" abc ", {" def "}}), {"abc", {"def"}})
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83
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84 %!error <Invalid call to strtrim> strtrim ()
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85 %!error <Invalid call to strtrim> strtrim ("abc", "def")
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86 %!error <argument must be a string> strtrim (1)
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87 %!error <argument must be a string> strtrim ({[]})
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88