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Clarify doc string for strcat. * scripts/strings/strcat.m: Clarify that the trailing spaces of the inputs are eliminated before the are concatentated.
author Ben Abbott <bpabbott@mac.com>
date Fri, 29 Jun 2012 17:23:19 -0400
parents f3d52523cde1
children 5d3a684236b0
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1 ## Copyright (C) 1994-2012 John W. Eaton
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2 ## Copyright (C) 2009 Jaroslav Hajek
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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
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23 ## horizontally. If the arguments are cells strings, @code{strcat}
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24 ## returns a cell string with the individual cells concatenated.
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25 ## For numerical input, each element is converted to the
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26 ## corresponding ASCII character. Trailing white space for each of
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27 ## the inputs (@var{s1}, @var{S2}, @dots{}) is eliminated before they
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28 ## are concatenated.
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29 ##
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30 ## For example:
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31 ##
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32 ## @example
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33 ## @group
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34 ## strcat ("|", " leading space is preserved", "|")
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35 ## @result{} | leading space is perserved|
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36 ## @end group
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37 ## @end example
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38 ##
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39 ## @example
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40 ## @group
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41 ## strcat ("|", "trailing space is eliminated ", "|")
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42 ## @result{} |trailing space is eliminated|
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43 ## @end group
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44 ## @end example
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45 ##
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46 ## @example
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47 ## @group
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48 ## strcat ("homogeneous space |", " ", "| is also eliminated")
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49 ## @result{} homogeneous space || is also eliminated
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50 ## @end group
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51 ## @end example
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52 ##
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53 ## @example
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54 ## @group
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55 ## s = [ "ab"; "cde" ];
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56 ## strcat (s, s, s)
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57 ## @result{}
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58 ## "ab ab ab "
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59 ## "cdecdecde"
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60 ## @end group
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61 ## @end example
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62 ##
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63 ## @example
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64 ## @group
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65 ## s = @{ "ab"; "cde" @};
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66 ## strcat (s, s, s)
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67 ## @result{}
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68 ## @{
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69 ## [1,1] = ababab
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70 ## [2,1] = cdecdecde
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71 ## @}
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72 ## @end group
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73 ## @end example
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74 ##
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75 ## @seealso{cstrcat, char, strvcat}
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76 ## @end deftypefn
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77
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78 ## Author: jwe
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79
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80 function st = strcat (varargin)
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81
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82 if (nargin > 0)
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83 if (nargin == 1)
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84 st = varargin{1};
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85 elseif (nargin > 1)
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86 ## Convert to cells of strings
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87 uo = "uniformoutput";
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88 reals = cellfun ("isreal", varargin);
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89 if (any (reals))
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90 varargin(reals) = cellfun ("char", varargin(reals), uo, false);
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91 endif
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92 chars = cellfun ("isclass", varargin, "char");
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93 allchar = all (chars);
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94 varargin(chars) = cellfun ("cellstr", varargin(chars), uo, false);
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95 if (! all (cellfun ("isclass", varargin, "cell")))
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96 error ("strcat: inputs must be strings or cells of strings");
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97 endif
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98
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99 ## We don't actually need to bring all cells to common size, because
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100 ## cellfun can now expand scalar cells.
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101 err = common_size (varargin{:});
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102
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103 if (err)
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104 error ("strcat: arguments must be the same size, or be scalars");
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105 endif
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106
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107 ## Cellfun handles everything for us.
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108 st = cellfun ("horzcat", varargin{:}, uo, false);
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109
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110 if (allchar)
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111 ## If all inputs were strings, return strings.
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112 st = char (st);
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113 endif
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114 endif
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115 else
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116 print_usage ();
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117 endif
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118
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119 endfunction
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120
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121 ## test the dimensionality
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122 ## 1d
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123 %!assert (strcat ("ab ", "ab "), "abab")
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124 %!assert (strcat ({"ab "}, "ab "), {"ab ab"})
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125 %!assert (strcat ("ab ", {"ab "}), {"abab "})
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126 %!assert (strcat ({"ab "}, {"ab "}), {"ab ab "})
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127 %!assert (strcat ("", "ab"), "ab")
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128 %!assert (strcat ("", {"ab"}, {""}), {"ab"})
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129 ## 2d
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130 %!assert (strcat (["ab ";"cde"], ["ab ";"cde"]), ["abab ";"cdecde"])
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131
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132 ## test for deblanking implied trailing spaces of character input
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133 %!assert (strcat ("foo", "bar"), "foobar")
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134 %!assert (strcat (["a"; "bb"], ["foo"; "bar"]), ["afoo "; "bbbar"])
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135
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136 ## test for mixing character and cell inputs
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137 %!assert (strcat ("a", {"bc", "de"}, "f"), {"abcf", "adef"})
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138
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139 ## test for scalar strings with vector strings
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140 %!assert (strcat (["a"; "b"], "c"), ["ac"; "bc"])
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142 ## test with cells with strings of differing lengths
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143 %!assert (all (strcmp (strcat ({"a", "bb"}, "ccc"), {"accc", "bbccc"})))
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144 %!assert (all (strcmp (strcat ("a", {"bb", "ccc"}), {"abb", "accc"})))
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145
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146 %!assert (strcat (1, 2), strcat (char(1), char(2)))
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147 %!assert (strcat ("", 2), strcat ([], char(2)))
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148
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149 %!error strcat ()
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150