Mercurial > hg > octave-lojdl
annotate scripts/general/private/__isequal__.m @ 11459:990c9cb52e5f
__isequal__: compare objects as if they are structures
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Fri, 07 Jan 2011 14:48:55 -0500 |
| parents | 01ddaedd6ad5 |
| children | caf1fd72f587 |
| rev | line source |
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| 8920 | 1 ## Copyright (C) 2000, 2005, 2006, 2007, 2009 Paul Kienzle |
| 5549 | 2 ## |
| 7016 | 3 ## This file is part of Octave. |
| 5549 | 4 ## |
| 7016 | 5 ## Octave is free software; you can redistribute it and/or modify it |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7 ## the Free Software Foundation; either version 3 of the License, or (at | |
| 8 ## your option) any later version. | |
| 9 ## | |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 5549 | 14 ## |
| 15 ## You should have received a copy of the GNU General Public License | |
| 7016 | 16 ## along with Octave; see the file COPYING. If not, see |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 5549 | 18 |
| 6945 | 19 ## Undocumented internal function. |
| 20 | |
| 5549 | 21 ## -*- texinfo -*- |
| 5550 | 22 ## @deftypefn {Function File} {} __isequal__ (@var{nans_compare_equal}, @var{x1}, @var{x2}, @dots{}) |
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23 ## Undocumented internal function. |
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24 ## @end deftypefn |
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25 |
| 5550 | 26 ## Return true if @var{x1}, @var{x2}, @dots{} are all equal and |
| 5549 | 27 ## @var{nans_compare_equal} evaluates to false. |
| 28 ## | |
| 29 ## If @var{nans_compare_equal} evaluates to true, then assume NaN == NaN. | |
| 30 | |
| 31 ## Modified by: William Poetra Yoga Hadisoeseno | |
| 32 | |
| 33 ## Algorithm: | |
| 34 ## | |
| 35 ## 1. Determine the class of x | |
| 36 ## 2. If x is of the struct, cell, list or char class, for each | |
| 37 ## argument after x, determine whether it has the same class | |
| 38 ## and size as x. | |
| 39 ## Otherwise, for each argument after x, verify that it is not | |
| 40 ## of the struct, cell, list or char class, and that it has | |
| 41 ## the same size as x. | |
| 42 ## 3. For each argument after x, compare it for equality with x: | |
| 43 ## a. struct compare each member by name, not by order (recursive) | |
| 44 ## b. cell/list compare each member by order (recursive) | |
| 45 ## c. char compare each member with strcmp | |
| 46 ## d. <other> compare each nonzero member, and assume NaN == NaN | |
| 47 ## if nans_compare_equal is nonzero. | |
| 48 | |
| 49 function t = __isequal__ (nans_compare_equal, x, varargin) | |
| 50 | |
| 51 if (nargin < 3) | |
| 6046 | 52 print_usage (); |
| 5549 | 53 endif |
| 54 | |
| 55 l_v = nargin - 2; | |
| 56 | |
| 6130 | 57 ## Generic tests. |
| 5549 | 58 |
| 6609 | 59 ## All arguments must either be of the same class or they must be |
| 60 ## numeric values. | |
| 61 t = (all (strcmp (class(x), | |
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62 cellfun (@class, varargin, "uniformoutput", false))) |
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63 || ((isnumeric (x) || islogical (x)) |
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64 && all (cellfun (@isnumeric, varargin) |
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65 | cellfun (@islogical, varargin)))); |
| 6609 | 66 |
| 6130 | 67 if (t) |
| 68 ## Test that everything has the same number of dimensions. | |
| 69 s_x = size (x); | |
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70 s_v = cellfun (@size, varargin, "uniformoutput", false); |
| 6130 | 71 t = all (length (s_x) == cellfun (@length, s_v)); |
| 72 endif | |
| 5549 | 73 |
| 6130 | 74 if (t) |
| 75 ## Test that everything is the same size since it has the same | |
| 76 ## dimensionality. | |
| 77 l_x = length (s_x); | |
| 78 s_v = reshape ([s_v{:}], length (s_x), []); | |
| 79 idx = 0; | |
| 80 while (t && idx < l_x) | |
| 81 idx++; | |
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82 t = all (s_x(idx) == s_v(idx,:)); |
| 6130 | 83 endwhile |
| 84 endif | |
| 5549 | 85 |
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86 ## From here on, compare objects as if they were structures. |
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87 if (isobject (x)) |
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88 x = struct (x); |
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89 varargin = cellfun (@struct, varargin, "uniformoutput", false); |
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90 endif |
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91 |
| 6130 | 92 if (t) |
| 93 ## Check individual classes. | |
| 94 if (isstruct (x)) | |
| 95 ## Test the number of fields. | |
| 96 fn_x = fieldnames (x); | |
| 97 l_fn_x = length (fn_x); | |
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98 fn_v = cellfun (@fieldnames, varargin, "uniformoutput", false); |
| 6130 | 99 t = all (l_fn_x == cellfun (@length, fn_v)); |
| 5549 | 100 |
| 6130 | 101 ## Test that all the names are equal. |
| 102 idx = 0; | |
| 103 s_fn_x = sort (fn_x); | |
| 104 while (t && idx < l_v) | |
| 10549 | 105 idx++; |
| 106 ## We'll allow the fieldnames to be in a different order. | |
| 107 t = all (strcmp (s_fn_x, sort (fn_v{idx}))); | |
| 6130 | 108 endwhile |
| 5549 | 109 |
| 6130 | 110 idx = 0; |
| 111 while (t && idx < l_fn_x) | |
| 10549 | 112 ## Test that all field values are equal. |
| 113 idx++; | |
| 114 args = {nans_compare_equal, {x.(fn_x{idx})}}; | |
| 115 for argn = 1:l_v | |
| 116 args{argn+2} = {varargin{argn}.(fn_x{idx})}; | |
| 117 endfor | |
| 118 ## Minimize function calls by calling for all the arguments at | |
| 119 ## once. | |
| 6130 | 120 t = __isequal__ (args{:}); |
| 121 endwhile | |
| 5549 | 122 |
| 6130 | 123 elseif (iscell (x)) |
| 124 ## Check that each element of a cell is equal. | |
| 125 l_x = numel (x); | |
| 126 idx = 0; | |
| 127 while (t && idx < l_x) | |
| 10549 | 128 idx++; |
| 129 args = {nans_compare_equal, x{idx}}; | |
| 130 for p = 1:l_v | |
| 131 args{p+2} = varargin{p}{idx}; | |
| 132 endfor | |
| 6130 | 133 t = __isequal__ (args{:}); |
| 134 endwhile | |
| 5549 | 135 |
| 6130 | 136 elseif (ischar (x)) |
| 5549 | 137 |
| 6130 | 138 ## Sizes are equal already, so we can just make everything into a |
| 139 ## row and test the rows. | |
| 140 for i = 1:l_v | |
| 10549 | 141 strings{i} = reshape (varargin{i}, 1, []); |
| 6130 | 142 endfor |
| 143 t = all (strcmp (reshape (x, 1, []), strings)); | |
| 5549 | 144 |
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145 elseif (isa (x, "function_handle")) |
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146 |
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147 ## The == operator is overloaded for handles. |
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148 t = all (cellfun (@eq, {x}, varargin)); |
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149 |
| 5549 | 150 else |
| 6130 | 151 ## Check the numeric types. |
| 152 | |
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153 f_x = find (x); |
| 6130 | 154 l_f_x = length (f_x); |
| 155 x = x(f_x); | |
| 156 for argn = 1:l_v | |
| 10549 | 157 y = varargin{argn}; |
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158 f_y = find (y); |
| 5549 | 159 |
| 10549 | 160 t = (l_f_x == length (f_y)) && all (f_x == f_y); |
| 161 if (!t) | |
| 6130 | 162 return; |
| 10549 | 163 endif |
| 5549 | 164 |
| 10549 | 165 y = y(f_y); |
| 166 m = (x == y); | |
| 167 t = all (m); | |
| 5549 | 168 |
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169 if (!t && nans_compare_equal) |
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170 t = isnan (x(!m)) && isnan (y(!m)); |
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171 endif |
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172 |
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173 if (!t) |
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174 return; |
| 10549 | 175 endif |
| 6130 | 176 endfor |
| 5549 | 177 |
| 6130 | 178 endif |
| 5549 | 179 endif |
| 180 | |
| 181 endfunction |