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annotate scripts/miscellaneous/setfield.m @ 19886:e9a0bd0b125c

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Rename 'matlab-incompatible' warning to 'language-extension'. * libinterp/corefcn/error.cc: replace the 'matlab-incompatible' warning with 'language-extension'. This wording will hopefully make it clear that it does not stop or prevent Matlab code from running correctly in Octave, it simply warns about usage of Octave only features. * libinterp/parse-tree/lex.h, libinterp/parse-tree/lex.ll: throw the new 'language-extension' warning ID. Also, adjust function names to better reflect the warning name. * libinterp/corefcn/gripes.cc, libinterp/octave-value/ov-struct.cc, liboctave/numeric/bsxfun.h: use the new 'language-extension' warning ID. * scripts/miscellaneous/warning_ids.m: fix warning ID and reword text. * doc/interpreter/basics.txi, doc/interpreter/container.txi, scripts/miscellaneous/setfield.m: replace warning ID on documentation. * NEWS: make note of the change.
author Carnë Draug <carandraug@octave.org>
date Mon, 23 Feb 2015 20:43:54 +0000
parents 9fc020886ae9
children
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1 ## Copyright (C) 2000-2015 Etienne Grossmann
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2 ## Copyright (C) 2009 VZLU Prague
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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} {@var{sout} =} setfield (@var{s}, @var{field}, @var{val})
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22 ## @deftypefnx {Function File} {@var{sout} =} setfield (@var{s}, @var{sidx1}, @var{field1}, @var{fidx1}, @var{sidx2}, @var{field2}, @var{fidx2}, @dots{}, @var{val})
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23 ##
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24 ## Return a @emph{copy} of the structure @var{s} with the field member
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25 ## @var{field} set to the value @var{val}.
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26 ##
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27 ## For example:
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28 ##
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29 ## @example
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30 ## @group
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31 ## @var{s} = struct ();
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32 ## @var{s} = setfield (@var{s}, "foo bar", 42);
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33 ## @end group
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34 ## @end example
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35 ##
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36 ## @noindent
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37 ## This is equivalent to
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38 ##
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39 ## @example
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40 ## @var{s}.("foo bar") = 42;
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41 ## @end example
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42 ##
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43 ## @noindent
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44 ## Note that ordinary structure syntax @code{@var{s}.foo bar = 42} cannot be
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45 ## used here, as the field name is not a valid Octave identifier because of
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46 ## the space character. Using arbitrary strings for field names is
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47 ## incompatible with @sc{matlab}, and this usage will emit a warning if the
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48 ## warning ID @code{Octave:language-extension} is enabled.
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49 ## @xref{XREFwarning_ids}.
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50 ##
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51 ## With the second calling form, set a field of a structure array. The
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52 ## input @var{sidx} selects an element of the structure array, @var{field}
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53 ## specifies the field name of the selected element, and @var{fidx} selects
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54 ## which element of the field (in the case of an array or cell array).
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55 ## The @var{sidx}, @var{field}, and @var{fidx} inputs can be repeated to
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56 ## address nested structure array elements. The structure array index and
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57 ## field element index must be cell arrays while the field name must be a
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58 ## string.
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59 ##
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60 ## For example:
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61 ##
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62 ## @example
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63 ## @group
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64 ## @var{s} = struct ("baz", 42);
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65 ## setfield (@var{s}, @{1@}, "foo", @{1@}, "bar", 54)
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66 ## @result{}
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67 ## ans =
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68 ## scalar structure containing the fields:
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69 ## baz = 42
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70 ## foo =
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71 ## scalar structure containing the fields:
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72 ## bar = 54
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73 ## @end group
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74 ## @end example
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75 ##
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76 ## The example begins with an ordinary scalar structure to which a nested
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77 ## scalar structure is added. In all cases, if the structure index @var{sidx}
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78 ## is not specified it defaults to 1 (scalar structure). Thus, the example
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79 ## above could be written more concisely as
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80 ## @code{setfield (@var{s}, "foo", "bar", 54)}
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81 ##
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82 ## Finally, an example with nested structure arrays:
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83 ##
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84 ## @example
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85 ## @group
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86 ## @var{sa}.foo = 1;
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87 ## @var{sa} = setfield (@var{sa}, @{2@}, "bar", @{3@}, "baz", @{1, 4@}, 5);
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88 ## @var{sa}(2).bar(3)
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89 ## @result{}
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90 ## ans =
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91 ## scalar structure containing the fields:
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92 ## baz = 0 0 0 5
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93 ## @end group
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94 ## @end example
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95 ##
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96 ## Here @var{sa} is a structure array whose field at elements 1 and 2 is in
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97 ## turn another structure array whose third element is a simple scalar
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98 ## structure. The terminal scalar structure has a field which contains a
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99 ## matrix value.
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100 ##
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101 ## Note that the same result as in the above example could be achieved by:
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102 ##
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103 ## @example
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104 ## @group
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105 ## @var{sa}.foo = 1;
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106 ## @var{sa}(2).bar(3).baz(1,4) = 5
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107 ## @end group
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108 ## @end example
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109 ## @seealso{getfield, rmfield, orderfields, isfield, fieldnames, isstruct, struct}
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110 ## @end deftypefn
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111
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112 ## Author: Etienne Grossmann <etienne@cs.uky.edu>
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113
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114 function sout = setfield (s, varargin)
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115
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116 if (nargin < 3)
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117 print_usage ();
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118 endif
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119
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120 subs = varargin(1:end-1);
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121 val = varargin{end};
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122 flds = cellfun ("isclass", subs, "char");
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123 idxs = cellfun ("isclass", subs, "cell");
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124 if (! all (flds | idxs))
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125 error ("setfield: invalid index");
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126 endif
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127
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128 typs = ifelse (flds, {"."}, {"()"});
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129 sout = subsasgn (s, struct ("type", typs, "subs", subs), val);
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130
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131 endfunction
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132
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133
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134 %!test
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135 %! x.a = "hello";
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136 %! x = setfield (x, "b", "world");
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137 %! y = struct ("a", "hello", "b", "world");
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138 %! assert (x, y);
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139 %!test
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140 %! oo(1,1).f0 = 1;
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141 %! oo = setfield (oo,{1,2},"fd",{3},"b", {1,4}, 6);
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142 %! assert (oo(1,2).fd(3).b(1,4), 6);
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143
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144 ## Test input validation
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145 %!error setfield ()
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146 %!error setfield (1)
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147 %!error setfield (1,2)
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148 %!error <invalid index> setfield (1,2,3)
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149