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annotate scripts/strings/strtrunc.m @ 20038:9fc020886ae9

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maint: Clean up m-files to follow Octave coding conventions. Try to trim long lines to < 80 chars. Use '##' for single line comments. Use '(...)' around tests for if/elseif/switch/while. Abut cell indexing operator '{' next to variable. Abut array indexing operator '(' next to variable. Use space between negation operator '!' and following expression. Use two newlines between endfunction and start of %!test or %!demo code. Remove unnecessary parens grouping between short-circuit operators. Remove stray extra spaces (typos) between variables and assignment operators. Remove stray extra spaces from ends of lines.
author Rik <rik@octave.org>
date Mon, 23 Feb 2015 14:54:39 -0800
parents 4197fc428c7d
children df437a52bcaf
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4197fc428c7d maint: Update copyright notices for 2015.
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1 ## Copyright (C) 2006-2015 William Poetra Yoga Hadisoeseno
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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} {} strtrunc (@var{s}, @var{n})
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21 ## Truncate the character string @var{s} to length @var{n}. If @var{s}
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22 ## is a character matrix, then the number of columns is adjusted.
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23 ## If @var{s} is a cell array of strings, then the operation is performed
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24 ## on each cell element and the new cell array is returned.
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25 ## @end deftypefn
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26
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27 function s = strtrunc (s, n)
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28
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29 if (nargin != 2)
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30 print_usage ();
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31 endif
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32
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33 n = fix (n);
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34 if (! isscalar (n) || n < 0)
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35 error ("strtrunc: length N must be a positive integer (N >= 0)");
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36 endif
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37
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38 if (ischar (s))
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39 if (n < columns (s))
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40 s = s(:, 1:n);
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41 endif
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42 elseif (iscellstr (s))
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43 ## Convoluted approach converts cellstr to char matrix, trims the character
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44 ## matrix using indexing, and then converts back to cellstr with mat2cell.
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45 ## This approach is 24X faster than using cellfun with call to strtrunc
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46 idx = cellfun ("size", s, 2) > n;
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47 rows = cellfun ("size", s(idx), 1);
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48 if (! isempty (rows))
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49 s(idx) = mat2cell (char (s(idx))(:, 1:n), rows);
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50 endif
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51 else
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52 error ("strtrunc: S must be a character string or a cell array of strings");
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53 endif
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54
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55 endfunction
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56
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58 %!assert (strtrunc ("abcdefg", 4), "abcd")
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59 %!assert (strtrunc ("abcdefg", 10), "abcdefg")
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60 %!assert (strtrunc (char ("abcdef", "fedcba"), 3), ["abc"; "fed"])
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61 %!assert (strtrunc ({"abcdef", "fedcba"}, 3), {"abc", "fed"})
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62 %!assert (strtrunc ({"", "1", "21", "321"}, 1), {"", "1", "2", "3"})
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63 %!assert (strtrunc ({"1", "", "2"}, 1), {"1", "", "2"})
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64 %!test
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65 %! cstr = {"line1"; ["line2"; "line3"]; "line4"};
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66 %! y = strtrunc (cstr, 4);
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67 %! assert (size (y), [3, 1]);
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68 %! assert (size (y{2}), [2, 4]);
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69 %! assert (y{2}, repmat ("line", 2, 1));
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70
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71 ## Test input validation
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72 %!error strtrunc ()
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73 %!error strtrunc ("abcd")
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74 %!error strtrunc ("abcd", 4, 5)
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75 %!error <N must be a positive integer> strtrunc ("abcd", ones (2,2))
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76 %!error <N must be a positive integer> strtrunc ("abcd", -1)
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77 %!error <S must be a character string or a cell array of strings> strtrunc (1, 1)
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78