--- /dev/null
+## Copyright (C) 2000-2012 Paul Kienzle
+##
+## This file is part of Octave.
+##
+## Octave is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3 of the License, or (at
+## your option) any later version.
+##
+## Octave is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING. If not, see
+## <http://www.gnu.org/licenses/>.
+
+## Undocumented internal function.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} __isequal__ (@var{nans_compare_equal}, @var{x1}, @var{x2}, @dots{})
+## Undocumented internal function.
+## @end deftypefn
+
+## Return true if @var{x1}, @var{x2}, @dots{} are all equal and
+## @var{nans_compare_equal} evaluates to false.
+##
+## If @var{nans_compare_equal} evaluates to true, then assume NaN == NaN.
+
+## Modified by: William Poetra Yoga Hadisoeseno
+
+## Algorithm:
+##
+## 1. Determine the class of x
+## 2. If x is of the struct, cell, list or char class, for each
+## argument after x, determine whether it has the same class
+## and size as x.
+## Otherwise, for each argument after x, verify that it is not
+## of the struct, cell, list or char class, and that it has
+## the same size as x.
+## 3. For each argument after x, compare it for equality with x:
+## a. struct compare each member by name, not by order (recursive)
+## b. cell/list compare each member by order (recursive)
+## c. char compare each member with strcmp
+## d. <other> compare each nonzero member, and assume NaN == NaN
+## if nans_compare_equal is nonzero.
+
+function t = __isequal__ (nans_compare_equal, x, varargin)
+
+ if (nargin < 3)
+ print_usage ();
+ endif
+
+ l_v = nargin - 2;
+
+ ## Generic tests.
+
+ ## All arguments must either be of the same class or they must be
+ ## numeric values.
+ t = (all (strcmp (class(x),
+ cellfun ("class", varargin, "uniformoutput", false)))
+ || ((isnumeric (x) || islogical (x))
+ && all (cellfun ("isnumeric", varargin)
+ | cellfun ("islogical", varargin))));
+
+ if (t)
+ ## Test that everything has the same number of dimensions.
+ s_x = size (x);
+ s_v = cellfun (@size, varargin, "uniformoutput", false);
+ t = all (length (s_x) == cellfun ("length", s_v));
+ endif
+
+ if (t)
+ ## Test that everything is the same size since it has the same
+ ## dimensionality.
+ l_x = length (s_x);
+ s_v = reshape ([s_v{:}], length (s_x), []);
+ idx = 0;
+ while (t && idx < l_x)
+ idx++;
+ t = all (s_x(idx) == s_v(idx,:));
+ endwhile
+ endif
+
+ ## From here on, compare objects as if they were structures.
+ if (isobject (x))
+ x = builtin ("struct", x);
+ varargin = cellfun (@(x) builtin ("struct", x), varargin,
+ "uniformoutput", false);
+ endif
+
+ if (t)
+ ## Check individual classes.
+ if (isstruct (x))
+ ## Test the number of fields.
+ fn_x = fieldnames (x);
+ l_fn_x = length (fn_x);
+ fn_v = cellfun ("fieldnames", varargin, "uniformoutput", false);
+ t = all (l_fn_x == cellfun ("length", fn_v));
+
+ ## Test that all the names are equal.
+ idx = 0;
+ s_fn_x = sort (fn_x);
+ while (t && idx < l_v)
+ idx++;
+ ## We'll allow the fieldnames to be in a different order.
+ t = all (strcmp (s_fn_x, sort (fn_v{idx})));
+ endwhile
+
+ idx = 0;
+ while (t && idx < l_fn_x)
+ ## Test that all field values are equal.
+ idx++;
+ args = {nans_compare_equal, {x.(fn_x{idx})}};
+ for argn = 1:l_v
+ args{argn+2} = {varargin{argn}.(fn_x{idx})};
+ endfor
+ ## Minimize function calls by calling for all the arguments at
+ ## once.
+ t = __isequal__ (args{:});
+ endwhile
+
+ elseif (iscell (x))
+ ## Check that each element of a cell is equal.
+ l_x = numel (x);
+ idx = 0;
+ while (t && idx < l_x)
+ idx++;
+ args = {nans_compare_equal, x{idx}};
+ for p = 1:l_v
+ args{p+2} = varargin{p}{idx};
+ endfor
+ t = __isequal__ (args{:});
+ endwhile
+
+ elseif (ischar (x))
+
+ ## Sizes are equal already, so we can just make everything into a
+ ## row and test the rows.
+ for i = 1:l_v
+ strings{i} = reshape (varargin{i}, 1, []);
+ endfor
+ t = all (strcmp (reshape (x, 1, []), strings));
+
+ elseif (isa (x, "function_handle"))
+
+ ## The == operator is overloaded for handles.
+ t = all (cellfun ("eq", {x}, varargin));
+
+ else
+ ## Check the numeric types.
+
+ f_x = find (x);
+ l_f_x = length (f_x);
+ x = x(f_x);
+ for argn = 1:l_v
+ y = varargin{argn};
+ f_y = find (y);
+
+ t = (l_f_x == length (f_y)) && all (f_x == f_y);
+ if (!t)
+ return;
+ endif
+
+ y = y(f_y);
+ m = (x == y);
+ t = all (m);
+
+ if (!t && nans_compare_equal)
+ t = isnan (x(!m)) && isnan (y(!m));
+ endif
+
+ if (!t)
+ return;
+ endif
+ endfor
+
+ endif
+ endif
+
+endfunction
git://git.creatis.insa-lyon.fr / CreaPhase.git / blobdiff