X-Git-Url: https://git.decadent.org.uk/gitweb/?a=blobdiff_plain;f=daklib%2Fformats.py;fp=daklib%2Fformats.py;h=e8ab1d77d205f85db14ee80ea2cd5173e7ce8b3f;hb=8c266683b16ad4f1ddcf2cc48cc7931ac007af59;hp=0000000000000000000000000000000000000000;hpb=1ef1804c272cf73da57a3e2d1cbf6c7610207ee9;p=dak.git

diff --git a/daklib/formats.py b/daklib/formats.py
new file mode 100644
index 00000000..e8ab1d77
--- /dev/null
+++ b/daklib/formats.py
@@ -0,0 +1,32 @@
+from regexes import re_verwithext
+from dak_exceptions import UnknownFormatError
+
+def parse_format(txt):
+    """
+    Parse a .changes Format string into a tuple representation for easy
+    comparison.
+
+    >>> parse_format('1.0')
+    (1, 0)
+    >>> parse_format('8.4 (hardy)')
+    (8, 4, 'hardy')
+
+    If the format doesn't match these forms, raises UnknownFormatError.
+    """
+
+    format = re_verwithext.search(txt)
+
+    if format is None:
+        raise UnknownFormatError, txt
+
+    format = format.groups()
+
+    if format[1] is None:
+        format = int(float(format[0])), 0, format[2]
+    else:
+        format = int(format[0]), int(format[1]), format[2]
+
+    if format[2] is None:
+        format = format[:2]
+
+    return format