1 files changed, 71 insertions, 0 deletions

diff --git a/bitbake/lib/bb/utils.py b/bitbake/lib/bb/utils.py
new file mode 100644
index 0000000000..ee8713a2d0
--- /dev/null
+++ b/bitbake/lib/bb/utils.py
@@ -0,0 +1,71 @@
+# ex:ts=4:sw=4:sts=4:et
+# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
+"""
+BitBake Utility Functions
+
+This program 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 2 of the License, or (at your option) any later
+version.
+
+This program 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
+this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA.
+
+This file is part of the BitBake build tools.
+"""
+
+digits = "0123456789"
+ascii_letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+
+import re
+
+def explode_version(s):
+    r = []
+    alpha_regexp = re.compile('^([a-zA-Z]+)(.*)$')
+    numeric_regexp = re.compile('^(\d+)(.*)$')
+    while (s != ''):
+        if s[0] in digits:
+            m = numeric_regexp.match(s)
+            r.append(int(m.group(1)))
+            s = m.group(2)
+            continue
+        if s[0] in ascii_letters:
+            m = alpha_regexp.match(s)
+            r.append(m.group(1))
+            s = m.group(2)
+            continue
+        s = s[1:]
+    return r
+
+def vercmp_part(a, b):
+    va = explode_version(a)
+    vb = explode_version(b)
+    while True:
+        if va == []:
+            ca = None
+        else:
+            ca = va.pop(0)
+        if vb == []:
+            cb = None
+        else:
+            cb = vb.pop(0)
+        if ca == None and cb == None:
+            return 0
+        if ca > cb:
+            return 1
+        if ca < cb:
+            return -1
+
+def vercmp(ta, tb):
+    (va, ra) = ta
+    (vb, rb) = tb
+
+    r = vercmp_part(va, vb)
+    if (r == 0):
+        r = vercmp_part(ra, rb)
+    return r