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-rw-r--r--meta/lib/oe/types.py31
1 files changed, 31 insertions, 0 deletions
diff --git a/meta/lib/oe/types.py b/meta/lib/oe/types.py
index ea31cf421..ea53df9bf 100644
--- a/meta/lib/oe/types.py
+++ b/meta/lib/oe/types.py
@@ -40,6 +40,31 @@ def choice(value, choices):
(value, choices))
return value
+class NoMatch(object):
+ """Stub python regex pattern object which never matches anything"""
+ def findall(self, string, flags=0):
+ return None
+
+ def finditer(self, string, flags=0):
+ return None
+
+ def match(self, flags=0):
+ return None
+
+ def search(self, string, flags=0):
+ return None
+
+ def split(self, string, maxsplit=0):
+ return None
+
+ def sub(pattern, repl, string, count=0):
+ return None
+
+ def subn(pattern, repl, string, count=0):
+ return None
+
+NoMatch = NoMatch()
+
def regex(value, regexflags=None):
"""OpenEmbedded 'regex' type
@@ -59,6 +84,12 @@ def regex(value, regexflags=None):
except AttributeError:
raise ValueError("Invalid regex flag '%s'" % flag)
+ if not value:
+ # Let's ensure that the default behavior for an undefined or empty
+ # variable is to match nothing. If the user explicitly wants to match
+ # anything, they can match '.*' instead.
+ return NoMatch
+
try:
return re.compile(value, flagval)
except re.error, exc: