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Location: kallithea/rhodecode/lib/dbmigrate/migrate/versioning/util/keyedinstance.py - annotation
631e8000eae8
1.1 KiB
text/x-python
diff parser: match the header order of hg diff --git patches
The output might look like:
diff --git a/A b/B
old mode 100644
new mode 100755
rename from A
rename to B
--- a/A
+++ b/B
Such files were shown as 'modified binary file chmod 100644 => 100755' without
diff.
Now the chmod and diff will be shown ... but still not the rename.
Correct parsing of headers do require a better parser - one do not just use a
regexp.
The output might look like:
diff --git a/A b/B
old mode 100644
new mode 100755
rename from A
rename to B
--- a/A
+++ b/B
Such files were shown as 'modified binary file chmod 100644 => 100755' without
diff.
Now the chmod and diff will be shown ... but still not the rename.
Correct parsing of headers do require a better parser - one do not just use a
regexp.
9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 6832ef664673 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 6832ef664673 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 9753e0907827 | #!/usr/bin/env python
# -*- coding: utf-8 -*-
class KeyedInstance(object):
"""A class whose instances have a unique identifier of some sort
No two instances with the same unique ID should exist - if we try to create
a second instance, the first should be returned.
"""
_instances = dict()
def __new__(cls, *p, **k):
instances = cls._instances
clskey = str(cls)
if clskey not in instances:
instances[clskey] = dict()
instances = instances[clskey]
key = cls._key(*p, **k)
if key not in instances:
instances[key] = super(KeyedInstance, cls).__new__(cls)
return instances[key]
@classmethod
def _key(cls, *p, **k):
"""Given a unique identifier, return a dictionary key
This should be overridden by child classes, to specify which parameters
should determine an object's uniqueness
"""
raise NotImplementedError()
@classmethod
def clear(cls):
# Allow cls.clear() as well as uniqueInstance.clear(cls)
if str(cls) in cls._instances:
del cls._instances[str(cls)]
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