--- /dev/null
+## Copyright (C) 2006-2012 Bill Denney
+##
+## 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/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} compare_versions (@var{v1}, @var{v2}, @var{operator})
+## Compare two version strings using the given @var{operator}.
+##
+## This function assumes that versions @var{v1} and @var{v2} are
+## arbitrarily long strings made of numeric and period characters
+## possibly followed by an arbitrary string (e.g., "1.2.3", "0.3",
+## "0.1.2+", or "1.2.3.4-test1").
+##
+## The version is first split into numeric and character portions
+## and then the parts are padded to be the same length (i.e., "1.1" would be
+## padded to be "1.1.0" when being compared with "1.1.1", and
+## separately, the character parts of the strings are padded with
+## nulls).
+##
+## The operator can be any logical operator from the set
+##
+## @itemize @bullet
+## @item
+## "=="
+## equal
+##
+## @item
+## "<"
+## less than
+##
+## @item
+## "<="
+## less than or equal to
+##
+## @item
+## ">"
+## greater than
+##
+## @item
+## ">="
+## greater than or equal to
+##
+## @item
+## "!="
+## not equal
+##
+## @item
+## "~="
+## not equal
+## @end itemize
+##
+## Note that version "1.1-test2" will compare as greater than
+## "1.1-test10". Also, since the numeric part is compared first, "a"
+## compares less than "1a" because the second string starts with a
+## numeric part even though @code{double("a")} is greater than
+## @code{double("1").}
+## @end deftypefn
+
+## Author: Bill Denney <denney@seas.upenn.edu>
+
+function out = compare_versions (v1, v2, operator)
+
+ if (nargin != 3)
+ print_usage ();
+ endif
+
+ ## Make sure that the version numbers are valid.
+ if (! (ischar (v1) && ischar (v2)))
+ error ("compare_versions: both version numbers must be strings");
+ elseif (rows (v1) != 1 || rows (v2) != 1)
+ error ("compare_versions: version numbers must be a single row");
+ endif
+
+ ## check and make sure that the operator is valid
+ if (! ischar (operator))
+ error ("compare_versions: OPERATOR must be a character string");
+ elseif (numel (operator) > 2)
+ error("compare_versions: OPERATOR must be 1 or 2 characters long");
+ endif
+
+ ## trim off any character data that is not part of a normal version
+ ## number
+ numbers = "0123456789.";
+
+ v1firstchar = find (! ismember (v1, numbers), 1);
+ v2firstchar = find (! ismember (v2, numbers), 1);
+ if (! isempty (v1firstchar))
+ v1c = v1(v1firstchar:length(v1));
+ v1nochar = v1(1:v1firstchar-1);
+ else
+ v1c = "";
+ v1nochar = v1;
+ endif
+ if (! isempty (v2firstchar))
+ v2c = v2(v2firstchar:length(v2));
+ v2nochar = v2(1:v2firstchar-1);
+ else
+ v2c = "";
+ v2nochar = v2;
+ endif
+
+ v1n = str2num (char (strsplit (v1nochar, ".")));
+ v2n = str2num (char (strsplit (v2nochar, ".")));
+ if ((isempty (v1n) && isempty (v1c)) || (isempty (v2n) && isempty(v2c)))
+ error ("compare_versions: given version strings are not valid: %s %s",
+ v1, v2);
+ endif
+
+ ## Assume that any additional elements would be 0 if one is longer
+ ## than the other.
+ maxnumlen = max ([length(v1n) length(v2n)]);
+ if (length (v1n) < maxnumlen)
+ v1n(length(v1n)+1:maxnumlen) = 0;
+ endif
+ if (length (v2n) < maxnumlen)
+ v2n(length(v2n)+1:maxnumlen) = 0;
+ endif
+
+ ## Assume that any additional character elements would be 0 if one is
+ ## longer than the other.
+ maxcharlen = max ([length(v1c), length(v2c)]);
+ if (length (v1c) < maxcharlen)
+ v1c(length(v1c)+1:maxcharlen) = "\0";
+ endif
+ if (length (v2c) < maxcharlen)
+ v2c(length(v2c)+1:maxcharlen) = "\0";
+ endif
+
+ ## Determine the operator.
+ if any (ismember (operator, "="))
+ equal_op = true;
+ else
+ equal_op = false;
+ endif
+ if any (ismember (operator, "~!"))
+ not_op = true;
+ else
+ not_op = false;
+ endif
+ if any (ismember (operator, "<"))
+ lt_op = true;
+ else
+ lt_op = false;
+ endif
+ if any (ismember (operator, ">"))
+ gt_op = true;
+ else
+ gt_op = false;
+ endif
+
+ ## Make sure that we don't have conflicting operators.
+ if (gt_op && lt_op)
+ error ("compare_versions: OPERATOR cannot contain both greater and less than symbols");
+ elseif ((gt_op || lt_op) && not_op)
+ error ("compare_versions: OPERATOR cannot contain not and greater than or less than symbols");
+ elseif (strcmp (operator, "="))
+ error ("compare_versions: equality OPERATOR is \"==\", not \"=\"");
+ elseif (! (equal_op || not_op || lt_op || gt_op))
+ error ("compare_versions: No valid OPERATOR specified");
+ endif
+
+ ## Compare the versions (making sure that they're the same shape)
+ vcmp = v1n(:) - v2n(:);
+ vcmp = [vcmp; (v1c - v2c)(:)];
+ if (lt_op)
+ ## so that we only need to check for the output being greater than 1
+ vcmp = -vcmp;
+ endif
+ firstdiff = find (vcmp != 0, 1);
+
+ if (isempty (firstdiff))
+ ## They're equal.
+ out = equal_op;
+ elseif (lt_op || gt_op)
+ ## They're correctly less than or greater than.
+ out = (vcmp(firstdiff) > 0);
+ else
+ ## They're not correctly less than or greater than, and they're not equal.
+ out = false;
+ endif
+
+ ## Reverse the output if not is given.
+ if (not_op)
+ out = !out;
+ endif
+
+endfunction
+
+## tests
+## test both equality symbols
+## test arbitrarily long equality
+%!assert(compare_versions("1.1.0.0.0", "1.1", "=="), true)
+%!assert(compare_versions("1", "1.1", "<"), true)
+%!assert(compare_versions("1.1", "1.1", "<="), true)
+%!assert(compare_versions("1.1", "1.1.1", "<="), true)
+%!assert(compare_versions("1.23", "1.24", "=<"), true)
+## test different length numbers
+%!assert(compare_versions("23.2000", "23.1", ">"), true)
+%!assert(compare_versions("0.0.2", "0.0.1", ">="), true)
+%!assert(compare_versions("0.2", "0.0.100", "=>"), true)
+%!assert(compare_versions("0.1", "0.2", "!="), true)
+%!assert(compare_versions("0.1", "0.2", "~="), true)
+
+## test alphanumeric strings
+%!assert(compare_versions("1a", "1b", "<"), true)
+%!assert(compare_versions("a", "1", "<"), true)
+%!assert(compare_versions("1a", "1b", ">"), false)
+%!assert(compare_versions("a", "1", ">"), false)
+%!assert(compare_versions("1.1.0a", "1.1.0b", "=="), false)
+%!assert(compare_versions("1.1.0a", "1.1.0b", "!="), true)
+%!assert(compare_versions("1.1.0test", "1.1.0b", "=="), false)
+%!assert(compare_versions("1.1.0test", "1.1.0test", "=="), true)
+
+## make sure that it won't just give true output
+%!assert(compare_versions("1", "0", "=="), false)
+## test arbitrarily long equality
+%!assert(compare_versions("1.1.1.0.0", "1.1", "=="), false)
+%!assert(compare_versions("1.1", "1", "<"), false)
+%!assert(compare_versions("2", "1.1", "<="), false)
+%!assert(compare_versions("1.1.1", "1.1", "<="), false)
+%!assert(compare_versions("1.25", "1.24", "=<"), false)
+## test different length numbers
+%!assert(compare_versions("23.2", "23.100", ">"), false)
+%!assert(compare_versions("0.0.0.2", "0.0.1", ">="), false)
+%!assert(compare_versions("0.0.20", "0.10.2", "=>"), false)
+%!assert(compare_versions("0.1", "0.1", "!="), false)
+%!assert(compare_versions("0.1", "0.1", "~="), false)
+
+%% Test input validation
+%!error(compare_versions(0.1, "0.1", "=="))
+%!error(compare_versions("0.1", 0.1, "=="))
+%!error(compare_versions(["0";".";"1"], "0.1", "=="))
+%!error(compare_versions("0.1", ["0";".";"1"], "=="))
+%!error(compare_versions("0.1", "0.1", "<>"))
+%!error(compare_versions("0.1", "0.1", "!>"))
+%!error(compare_versions("0.1", "0.1", "="))
+%!error(compare_versions("0.1", "0.1", "aa"))
+
+
git://git.creatis.insa-lyon.fr / CreaPhase.git / blobdiff