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maint: update Octave Project Developers copyright for the new year
author John W. Eaton <jwe@octave.org>
date Fri, 22 Dec 2023 12:08:17 -0500
parents 597f3ee61a48
children
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1 ########################################################################
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2 ##
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3 ## Copyright (C) 2000-2024 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{sout} =} setfield (@var{s}, @var{field}, @var{val})
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28 ## @deftypefnx {} {@var{sout} =} setfield (@var{s}, @var{sidx1}, @var{field1}, @var{fidx1}, @var{sidx2}, @var{field2}, @var{fidx2}, @dots{}, @var{val})
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29 ##
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30 ## Return a @emph{copy} of the structure @var{s} with the field member
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31 ## @var{field} set to the value @var{val}.
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32 ##
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33 ## For example:
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34 ##
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35 ## @example
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36 ## @group
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37 ## @var{s} = struct ();
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38 ## @var{s} = setfield (@var{s}, "foo bar", 42);
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39 ## @end group
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40 ## @end example
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41 ##
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42 ## @noindent
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43 ## This is equivalent to
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44 ##
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45 ## @example
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46 ## @var{s}.("foo bar") = 42;
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47 ## @end example
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48 ##
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49 ## @noindent
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50 ## Note that ordinary structure syntax @code{@var{s}.foo bar = 42} cannot be
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51 ## used here, as the field name is not a valid Octave identifier because of
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52 ## the space character. Using arbitrary strings for field names is
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53 ## incompatible with @sc{matlab}, and this usage will emit a warning if the
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54 ## warning ID @code{Octave:language-extension} is enabled.
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55 ## @xref{XREFwarning_ids,,@code{warning_ids}}.
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56 ##
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57 ## With the second calling form, set a field of a structure array. The
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58 ## input @var{sidx} selects an element of the structure array, @var{field}
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59 ## specifies the field name of the selected element, and @var{fidx} selects
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60 ## which element of the field (in the case of an array or cell array).
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61 ## The @var{sidx}, @var{field}, and @var{fidx} inputs can be repeated to
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62 ## address nested structure array elements. The structure array index and
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63 ## field element index must be cell arrays while the field name must be a
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64 ## string.
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65 ##
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66 ## For example:
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67 ##
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68 ## @example
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69 ## @group
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70 ## @var{s} = struct ("baz", 42);
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71 ## setfield (@var{s}, @{1@}, "foo", @{1@}, "bar", 54)
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72 ## @result{}
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73 ## ans =
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74 ## scalar structure containing the fields:
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75 ## baz = 42
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76 ## foo =
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77 ## scalar structure containing the fields:
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78 ## bar = 54
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79 ## @end group
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80 ## @end example
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81 ##
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82 ## The example begins with an ordinary scalar structure to which a nested
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83 ## scalar structure is added. In all cases, if the structure index @var{sidx}
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84 ## is not specified it defaults to 1 (scalar structure). Thus, the example
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85 ## above could be written more concisely as
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86 ## @code{setfield (@var{s}, "foo", "bar", 54)}
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87 ##
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88 ## Finally, an example with nested structure arrays:
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89 ##
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90 ## @example
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91 ## @group
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92 ## @var{sa}.foo = 1;
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93 ## @var{sa} = setfield (@var{sa}, @{2@}, "bar", @{3@}, "baz", @{1, 4@}, 5);
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94 ## @var{sa}(2).bar(3)
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95 ## @result{}
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96 ## ans =
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97 ## scalar structure containing the fields:
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98 ## baz = 0 0 0 5
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99 ## @end group
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100 ## @end example
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101 ##
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102 ## Here @var{sa} is a structure array whose field at elements 1 and 2 is in
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103 ## turn another structure array whose third element is a simple scalar
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104 ## structure. The terminal scalar structure has a field which contains a
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105 ## matrix value.
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106 ##
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107 ## Note that the same result as in the above example could be achieved by:
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108 ##
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109 ## @example
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110 ## @group
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111 ## @var{sa}.foo = 1;
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112 ## @var{sa}(2).bar(3).baz(1,4) = 5
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113 ## @end group
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114 ## @end example
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115 ## @seealso{getfield, rmfield, orderfields, isfield, fieldnames, isstruct,
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116 ## struct}
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117 ## @end deftypefn
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118
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119 function sout = setfield (s, varargin)
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120
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121 if (nargin < 3)
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122 print_usage ();
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123 endif
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124
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125 subs = varargin(1:end-1);
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126 val = varargin{end};
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127 flds = cellfun ("isclass", subs, "char");
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128 idxs = cellfun ("isclass", subs, "cell");
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129 if (! all (flds | idxs))
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130 error ("setfield: invalid index");
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131 endif
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132
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133 typs = ifelse (flds, {"."}, {"()"});
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134 sout = subsasgn (s, struct ("type", typs, "subs", subs), val);
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135
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136 endfunction
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137
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138
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139 %!test
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140 %! x.a = "hello";
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141 %! x = setfield (x, "b", "world");
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142 %! y = struct ("a", "hello", "b", "world");
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143 %! assert (x, y);
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144 %!test
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145 %! oo(1,1).f0 = 1;
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146 %! oo = setfield (oo,{1,2},"fd",{3},"b", {1,4}, 6);
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147 %! assert (oo(1,2).fd(3).b(1,4), 6);
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148
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149 ## Test input validation
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150 %!error <Invalid call> setfield ()
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151 %!error <Invalid call> setfield (1)
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152 %!error <Invalid call> setfield (1,2)
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153 %!error <invalid index> setfield (1,2,3)