1 ## Copyright (C) 2006-2012 Bill Denney
3 ## This file is part of Octave.
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13 ## General Public License for more details.
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20 ## @deftypefn {Function File} {} compare_versions (@var{v1}, @var{v2}, @var{operator})
21 ## Compare two version strings using the given @var{operator}.
23 ## This function assumes that versions @var{v1} and @var{v2} are
24 ## arbitrarily long strings made of numeric and period characters
25 ## possibly followed by an arbitrary string (e.g., "1.2.3", "0.3",
26 ## "0.1.2+", or "1.2.3.4-test1").
28 ## The version is first split into numeric and character portions
29 ## and then the parts are padded to be the same length (i.e., "1.1" would be
30 ## padded to be "1.1.0" when being compared with "1.1.1", and
31 ## separately, the character parts of the strings are padded with
34 ## The operator can be any logical operator from the set
47 ## less than or equal to
55 ## greater than or equal to
66 ## Note that version "1.1-test2" will compare as greater than
67 ## "1.1-test10". Also, since the numeric part is compared first, "a"
68 ## compares less than "1a" because the second string starts with a
69 ## numeric part even though @code{double("a")} is greater than
70 ## @code{double("1").}
73 ## Author: Bill Denney <denney@seas.upenn.edu>
75 function out = compare_versions (v1, v2, operator)
81 ## Make sure that the version numbers are valid.
82 if (! (ischar (v1) && ischar (v2)))
83 error ("compare_versions: both version numbers must be strings");
84 elseif (rows (v1) != 1 || rows (v2) != 1)
85 error ("compare_versions: version numbers must be a single row");
88 ## check and make sure that the operator is valid
89 if (! ischar (operator))
90 error ("compare_versions: OPERATOR must be a character string");
91 elseif (numel (operator) > 2)
92 error("compare_versions: OPERATOR must be 1 or 2 characters long");
95 ## trim off any character data that is not part of a normal version
97 numbers = "0123456789.";
99 v1firstchar = find (! ismember (v1, numbers), 1);
100 v2firstchar = find (! ismember (v2, numbers), 1);
101 if (! isempty (v1firstchar))
102 v1c = v1(v1firstchar:length(v1));
103 v1nochar = v1(1:v1firstchar-1);
108 if (! isempty (v2firstchar))
109 v2c = v2(v2firstchar:length(v2));
110 v2nochar = v2(1:v2firstchar-1);
116 v1n = str2num (char (strsplit (v1nochar, ".")));
117 v2n = str2num (char (strsplit (v2nochar, ".")));
118 if ((isempty (v1n) && isempty (v1c)) || (isempty (v2n) && isempty(v2c)))
119 error ("compare_versions: given version strings are not valid: %s %s",
123 ## Assume that any additional elements would be 0 if one is longer
125 maxnumlen = max ([length(v1n) length(v2n)]);
126 if (length (v1n) < maxnumlen)
127 v1n(length(v1n)+1:maxnumlen) = 0;
129 if (length (v2n) < maxnumlen)
130 v2n(length(v2n)+1:maxnumlen) = 0;
133 ## Assume that any additional character elements would be 0 if one is
134 ## longer than the other.
135 maxcharlen = max ([length(v1c), length(v2c)]);
136 if (length (v1c) < maxcharlen)
137 v1c(length(v1c)+1:maxcharlen) = "\0";
139 if (length (v2c) < maxcharlen)
140 v2c(length(v2c)+1:maxcharlen) = "\0";
143 ## Determine the operator.
144 if any (ismember (operator, "="))
149 if any (ismember (operator, "~!"))
154 if any (ismember (operator, "<"))
159 if any (ismember (operator, ">"))
165 ## Make sure that we don't have conflicting operators.
167 error ("compare_versions: OPERATOR cannot contain both greater and less than symbols");
168 elseif ((gt_op || lt_op) && not_op)
169 error ("compare_versions: OPERATOR cannot contain not and greater than or less than symbols");
170 elseif (strcmp (operator, "="))
171 error ("compare_versions: equality OPERATOR is \"==\", not \"=\"");
172 elseif (! (equal_op || not_op || lt_op || gt_op))
173 error ("compare_versions: No valid OPERATOR specified");
176 ## Compare the versions (making sure that they're the same shape)
177 vcmp = v1n(:) - v2n(:);
178 vcmp = [vcmp; (v1c - v2c)(:)];
180 ## so that we only need to check for the output being greater than 1
183 firstdiff = find (vcmp != 0, 1);
185 if (isempty (firstdiff))
188 elseif (lt_op || gt_op)
189 ## They're correctly less than or greater than.
190 out = (vcmp(firstdiff) > 0);
192 ## They're not correctly less than or greater than, and they're not equal.
196 ## Reverse the output if not is given.
204 ## test both equality symbols
205 ## test arbitrarily long equality
206 %!assert(compare_versions("1.1.0.0.0", "1.1", "=="), true)
207 %!assert(compare_versions("1", "1.1", "<"), true)
208 %!assert(compare_versions("1.1", "1.1", "<="), true)
209 %!assert(compare_versions("1.1", "1.1.1", "<="), true)
210 %!assert(compare_versions("1.23", "1.24", "=<"), true)
211 ## test different length numbers
212 %!assert(compare_versions("23.2000", "23.1", ">"), true)
213 %!assert(compare_versions("0.0.2", "0.0.1", ">="), true)
214 %!assert(compare_versions("0.2", "0.0.100", "=>"), true)
215 %!assert(compare_versions("0.1", "0.2", "!="), true)
216 %!assert(compare_versions("0.1", "0.2", "~="), true)
218 ## test alphanumeric strings
219 %!assert(compare_versions("1a", "1b", "<"), true)
220 %!assert(compare_versions("a", "1", "<"), true)
221 %!assert(compare_versions("1a", "1b", ">"), false)
222 %!assert(compare_versions("a", "1", ">"), false)
223 %!assert(compare_versions("1.1.0a", "1.1.0b", "=="), false)
224 %!assert(compare_versions("1.1.0a", "1.1.0b", "!="), true)
225 %!assert(compare_versions("1.1.0test", "1.1.0b", "=="), false)
226 %!assert(compare_versions("1.1.0test", "1.1.0test", "=="), true)
228 ## make sure that it won't just give true output
229 %!assert(compare_versions("1", "0", "=="), false)
230 ## test arbitrarily long equality
231 %!assert(compare_versions("1.1.1.0.0", "1.1", "=="), false)
232 %!assert(compare_versions("1.1", "1", "<"), false)
233 %!assert(compare_versions("2", "1.1", "<="), false)
234 %!assert(compare_versions("1.1.1", "1.1", "<="), false)
235 %!assert(compare_versions("1.25", "1.24", "=<"), false)
236 ## test different length numbers
237 %!assert(compare_versions("23.2", "23.100", ">"), false)
238 %!assert(compare_versions("0.0.0.2", "0.0.1", ">="), false)
239 %!assert(compare_versions("0.0.20", "0.10.2", "=>"), false)
240 %!assert(compare_versions("0.1", "0.1", "!="), false)
241 %!assert(compare_versions("0.1", "0.1", "~="), false)
243 %% Test input validation
244 %!error(compare_versions(0.1, "0.1", "=="))
245 %!error(compare_versions("0.1", 0.1, "=="))
246 %!error(compare_versions(["0";".";"1"], "0.1", "=="))
247 %!error(compare_versions("0.1", ["0";".";"1"], "=="))
248 %!error(compare_versions("0.1", "0.1", "<>"))
249 %!error(compare_versions("0.1", "0.1", "!>"))
250 %!error(compare_versions("0.1", "0.1", "="))
251 %!error(compare_versions("0.1", "0.1", "aa"))