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annotate scripts/strings/strcat.m @ 7813:12a68443191c

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[mq]: cellstr
author Jaroslav Hajek <highegg@gmail.com>
date Thu, 22 May 2008 22:00:26 +0200
parents 3422f39573b1
children 3a4694d67dbb
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1 ## Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003,
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2 ## 2005, 2006, 2007 John W. Eaton
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} strcat (@var{s1}, @var{s2}, @dots{})
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22 ## Return a string containing all the arguments concatenated. For example,
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23 ##
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24 ## @example
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25 ## @group
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26 ## s = [ "ab"; "cde" ];
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27 ## strcat (s, s, s)
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28 ## @result{} "ab ab ab "
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29 ## "cdecdecde"
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30 ## @end group
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31 ## @end example
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32 ## @end deftypefn
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33
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34 ## Author: jwe
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35
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36 function st = strcat (varargin)
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37
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38 if (nargin > 0)
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39 if (nargin == 1)
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40 st = varargin{1};
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41 elseif (nargin > 1)
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42 ## Convert to cells of strings
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43 numstrs(nargin) = 0;
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44 dims{nargin} = [];
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45 allchar = true;
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46 for nv = 1:nargin
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47 if (ischar (varargin{nv}))
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48 varargin{nv} = cellstr (varargin{nv});
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49 elseif (iscell (varargin{nv}))
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50 allchar = false;
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51 else
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52 error ("strcat: inputs must be strings or cells of strings.")
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53 endif
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54 dims{nv} = size (varargin{nv});
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55 numstrs(nv) = numel (varargin{nv});
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56 endfor
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57
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58 ## Set all cells to a common size
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59 n = find (numstrs == max (numstrs), 1);
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60 maxstrs = numstrs (n);
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61 dim = dims{n};
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62 for nv = find (numstrs == 1)
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63 str = varargin{nv}{1};
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64 varargin{nv} = cell (dim);
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65 varargin{nv}{:} = str;
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66 endfor
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67
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68 ## Concatenate the strings
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69 st = varargin{1};
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70 for ns = 1:maxstrs
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71 for nv = 2:nargin
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72 if (size_equal (st, varargin{nv}))
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73 st{ns} = [st{ns}, varargin{nv}{ns}];
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74 else
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75 error ("strcat: arguments must be the same size, or be scalars.");
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76 endif
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77 endfor
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78 endfor
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79
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80 if (allchar)
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81 ## If all inputs were strings, return strings.
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82 st = char (st);
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83 endif
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84 endif
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85 else
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86 print_usage ();
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87 endif
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88
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89 endfunction
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90
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91 ## test the dimensionality
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92 ## 1d
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93 %!assert(strcat("ab ", "ab "), "abab")
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94 %!assert(strcat({"ab "}, "ab "), {"ab ab"})
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95 %!assert(strcat("ab ", {"ab "}), {"abab "})
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96 %!assert(strcat({"ab "}, {"ab "}), {"ab ab "})
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97 %!assert(strcat("", "ab"), "ab")
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98 %!assert(strcat("", {"ab"}, {""}), {"ab"})
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99 ## 2d
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100 %!assert(strcat(["ab ";"cde"], ["ab ";"cde"]), ["abab ";"cdecde"])
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101
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102 ## test for deblanking implied trailing spaces of character input
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103 %!assert((strcmp (strcat ("foo", "bar"), "foobar") &&
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104 %! strcmp (strcat (["a"; "bb"], ["foo"; "bar"]), ["afoo "; "bbbar"])));
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105
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106 ## test for mixing character and cell inputs
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107 %!assert(all (strcmp (strcat ("a", {"bc", "de"}, "f"), {"abcf", "adef"})))
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108
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109 ## test for scalar strings with vector strings
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110 %!assert(all (strcmp (strcat (["a"; "b"], "c"), ["ac"; "bc"])))
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111
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112 ## test with cells with strings of differing lengths
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113 %!assert(all (strcmp (strcat ({"a", "bb"}, "ccc"), {"accc", "bbccc"})))
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114 %!assert(all (strcmp (strcat ("a", {"bb", "ccc"}), {"abb", "accc"})))
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115
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116 %!error strcat ();
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117
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118 %!error strcat (1, 2);
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119