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maint: Merge default to bytecode-interpreter.
author Markus Mützel <markus.muetzel@gmx.de>
date Tue, 21 May 2024 18:29:03 +0200
parents 2e484f9f1f18
children
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1 ########################################################################
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2 ##
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3 ## Copyright (C) 2006-2024 The Octave Project Developers
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4 ##
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5 ## See the file COPYRIGHT.md in the top-level directory of this
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6 ## distribution or <https://octave.org/copyright/>.
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7 ##
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8 ## This file is part of Octave.
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9 ##
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10 ## Octave is free software: you can redistribute it and/or modify it
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11 ## under the terms of the GNU General Public License as published by
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12 ## the Free Software Foundation, either version 3 of the License, or
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13 ## (at your option) any later version.
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14 ##
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15 ## Octave is distributed in the hope that it will be useful, but
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16 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ## GNU General Public License for more details.
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19 ##
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20 ## You should have received a copy of the GNU General Public License
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21 ## along with Octave; see the file COPYING. If not, see
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22 ## <https://www.gnu.org/licenses/>.
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23 ##
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24 ########################################################################
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25
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26 ## -*- texinfo -*-
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27 ## @deftypefn {} {@var{s} =} strtrunc (@var{s}, @var{n})
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28 ## Truncate the character string @var{s} to length @var{n}.
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29 ##
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30 ## If @var{s} is a character matrix, then the number of columns is adjusted.
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31 ##
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32 ## If @var{s} is a cell array of strings, then the operation is performed
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33 ## on each cell element and the new cell array is returned.
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34 ## @end deftypefn
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35
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36 function s = strtrunc (s, n)
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37
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38 if (nargin != 2)
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39 print_usage ();
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40 endif
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41
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42 n = fix (n);
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43 if (! isscalar (n) || n < 0)
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44 error ("strtrunc: length N must be a positive integer (N >= 0)");
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45 endif
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46
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47 if (ischar (s))
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48 if (n < columns (s))
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49 s = s(:, 1:n);
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50 endif
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51 elseif (iscellstr (s))
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52 ## Convoluted approach converts cellstr to char matrix, trims the character
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53 ## matrix using indexing, and then converts back to cellstr with mat2cell.
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54 ## This approach is 24X faster than using cellfun with call to strtrunc
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55 idx = cellfun ("size", s, 2) > n;
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56 rows = cellfun ("size", s(idx), 1);
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57 if (! isempty (rows))
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58 s(idx) = mat2cell (char (s(idx))(:, 1:n), rows);
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59 endif
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60 else
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61 error ("strtrunc: S must be a character string or a cell array of strings");
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62 endif
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63
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64 endfunction
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65
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66
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67 %!assert (strtrunc ("abcdefg", 4), "abcd")
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68 %!assert (strtrunc ("abcdefg", 10), "abcdefg")
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69 %!assert (strtrunc (char ("abcdef", "fedcba"), 3), ["abc"; "fed"])
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70 %!assert (strtrunc ({"abcdef", "fedcba"}, 3), {"abc", "fed"})
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71 %!assert (strtrunc ({"", "1", "21", "321"}, 1), {"", "1", "2", "3"})
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72 %!assert (strtrunc ({"1", "", "2"}, 1), {"1", "", "2"})
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73 %!test
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74 %! cstr = {"line1"; ["line2"; "line3"]; "line4"};
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75 %! y = strtrunc (cstr, 4);
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76 %! assert (size (y), [3, 1]);
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77 %! assert (size (y{2}), [2, 4]);
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78 %! assert (y{2}, repmat ("line", 2, 1));
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79
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80 ## Test input validation
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81 %!error <Invalid call> strtrunc ()
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82 %!error strtrunc ("abcd")
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83 %!error strtrunc ("abcd", 4, 5)
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84 %!error <N must be a positive integer> strtrunc ("abcd", ones (2,2))
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85 %!error <N must be a positive integer> strtrunc ("abcd", -1)
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86 %!error <S must be a character string or a cell array of strings> strtrunc (1, 1)