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maint: update copyright notices for 2012
author John W. Eaton <jwe@octave.org>
date Mon, 02 Jan 2012 14:25:41 -0500
parents 9cae456085c2
children 4d917a6a858b
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1 ## Copyright (C) 2009-2012 Jaroslav Hajek
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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} {[@var{cstr}] =} strsplit (@var{s}, @var{sep})
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21 ## @deftypefnx {Function File} {[@var{cstr}] =} strsplit (@var{s}, @var{sep}, @var{strip_empty})
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22 ## Split the string @var{s} using one or more separators @var{sep} and return
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23 ## a cell array of strings. Consecutive separators and separators at
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24 ## boundaries result in empty strings, unless @var{strip_empty} is true.
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25 ## The default value of @var{strip_empty} is false.
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26 ##
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27 ## 2-D character arrays are split at separators and at the original column
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28 ## boundaries.
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29 ##
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30 ## Example:
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31 ##
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32 ## @example
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33 ## @group
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34 ## strsplit ("a,b,c", ",")
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35 ## @result{}
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36 ## @{
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37 ## [1,1] = a
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38 ## [1,2] = b
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39 ## [1,3] = c
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40 ## @}
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41 ##
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42 ## strsplit (["a,b" ; "cde"], ",")
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43 ## @result{}
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44 ## @{
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45 ## [1,1] = a
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46 ## [1,2] = b
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47 ## [1,3] = cde
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48 ## @}
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49 ## @end group
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50 ## @end example
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51 ## @seealso{strtok}
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52 ## @end deftypefn
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53
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54 function cstr = strsplit (s, sep, strip_empty = false)
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55
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56 if (nargin < 2 || nargin > 3)
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57 print_usage ();
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58 elseif (! ischar (s) || ! ischar (sep))
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59 error ("strsplit: S and SEP must be string values");
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60 elseif (! isscalar (strip_empty))
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61 error ("strsplit: STRIP_EMPTY must be a scalar value");
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62 endif
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63
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64 if (isempty (s))
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65 cstr = cell (size (s));
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66 else
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67 if (rows (s) > 1)
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68 ## For 2-D arrays, add separator character at line boundaries
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69 ## and transform to single string
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70 s(:, end+1) = sep(1);
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71 s = reshape (s.', 1, numel (s));
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72 s(end) = [];
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73 endif
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74
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75 ## Split s according to delimiter
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76 if (isscalar (sep))
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77 ## Single separator
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78 idx = find (s == sep);
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79 else
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80 ## Multiple separators
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81 idx = strchr (s, sep);
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82 endif
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83
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84 ## Get substring lengths.
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85 if (isempty (idx))
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86 strlens = length (s);
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87 else
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88 strlens = [idx(1)-1, diff(idx)-1, numel(s)-idx(end)];
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89 endif
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90 ## Remove separators.
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91 s(idx) = [];
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92 if (strip_empty)
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93 ## Omit zero lengths.
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94 strlens = strlens(strlens != 0);
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95 endif
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96
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97 ## Convert!
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98 cstr = mat2cell (s, 1, strlens);
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99 endif
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100
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101 endfunction
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102
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103
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104 %!assert (strsplit ("road to hell", " "), {"road", "to", "hell"})
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105 %!assert (strsplit ("road to^hell", " ^"), {"road", "to", "hell"})
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106 %!assert (strsplit ("road to--hell", " -", true), {"road", "to", "hell"})
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107 %!assert (strsplit (["a,bc";",de"], ","), {"a", "bc", ones(1,0), "de "})
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108 %!assert (strsplit (["a,bc";",de"], ",", true), {"a", "bc", "de "})
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109 %!assert (strsplit (["a,bc";",de"], ", ", true), {"a", "bc", "de"})
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110
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111 %% Test input validation
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112 %!error strsplit ()
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113 %!error strsplit ("abc")
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114 %!error strsplit ("abc", "b", true, 4)
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115 %!error <S and SEP must be string values> strsplit (123, "b")
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116 %!error <S and SEP must be string values> strsplit ("abc", 1)
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117 %!error <STRIP_EMPTY must be a scalar value> strsplit ("abc", "def", ones(3,3))
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118