Revert "Revert "pylint: upgrade to 1.3.1""

third_party/logilab/common/deprecation.py

-# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+# copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
 # contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
 #
 # This file is part of logilab-common.
 #
 # logilab-common is free software: you can redistribute it and/or modify it under
 # the terms of the GNU Lesser General Public License as published by the Free
 # Software Foundation, either version 2.1 of the License, or (at your option) any
 # later version.
 #
 # logilab-common 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 Lesser General Public License for more
 # details.
 #
 # You should have received a copy of the GNU Lesser General Public License along
 # with logilab-common.  If not, see <http://www.gnu.org/licenses/>.
 """Deprecation utilities."""
 
 __docformat__ = "restructuredtext en"
 
 import sys
 from warnings import warn
 
-class class_deprecated(type):
-    """metaclass to print a warning on instantiation of a deprecated class"""
+from logilab.common.changelog import Version
 
-    def __call__(cls, *args, **kwargs):
-        msg = getattr(cls, "__deprecation_warning__",
-                      "%(cls)s is deprecated") % {'cls': cls.__name__}
-        warn(msg, DeprecationWarning, stacklevel=2)
-        return type.__call__(cls, *args, **kwargs)
 
+class DeprecationWrapper(object):
+    """proxy to print a warning on access to any attribute of the wrapped object
+    """
+    def __init__(self, proxied, msg=None):
+        self._proxied = proxied
+        self._msg = msg
+
+    def __getattr__(self, attr):
+        warn(self._msg, DeprecationWarning, stacklevel=2)
+        return getattr(self._proxied, attr)
+
+    def __setattr__(self, attr, value):
+        if attr in ('_proxied', '_msg'):
+            self.__dict__[attr] = value
+        else:
+            warn(self._msg, DeprecationWarning, stacklevel=2)
+            setattr(self._proxied, attr, value)
+
+
+class DeprecationManager(object):
+    """Manage the deprecation message handling. Messages are dropped for
+    versions more recent than the 'compatible' version. Example::
+
+        deprecator = deprecation.DeprecationManager("module_name")
+        deprecator.compatibility('1.3')
+
+        deprecator.warn('1.2', "message.")
+
+        @deprecator.deprecated('1.2', 'Message')
+        def any_func():
+            pass
+
+        class AnyClass(object):
+            __metaclass__ = deprecator.class_deprecated('1.2')
+    """
+    def __init__(self, module_name=None):
+        """
+        """
+        self.module_name = module_name
+        self.compatible_version = None
+
+    def compatibility(self, compatible_version):
+        """Set the compatible version.
+        """
+        self.compatible_version = Version(compatible_version)
+
+    def deprecated(self, version=None, reason=None, stacklevel=2, name=None, doc=None):
+        """Display a deprecation message only if the version is older than the
+        compatible version.
+        """
+        def decorator(func):
+            message = reason or 'The function "%s" is deprecated'
+            if '%s' in message:
+                message %= func.__name__
+            def wrapped(*args, **kwargs):
+                self.warn(version, message, stacklevel+1)
+                return func(*args, **kwargs)
+            return wrapped
+        return decorator
+
+    def class_deprecated(self, version=None):
+        class metaclass(type):
+            """metaclass to print a warning on instantiation of a deprecated class"""
+
+            def __call__(cls, *args, **kwargs):
+                msg = getattr(cls, "__deprecation_warning__",
+                              "%(cls)s is deprecated") % {'cls': cls.__name__}
+                self.warn(version, msg, stacklevel=3)
+                return type.__call__(cls, *args, **kwargs)
+        return metaclass
+
+    def moved(self, version, modpath, objname):
+        """use to tell that a callable has been moved to a new module.
+
+        It returns a callable wrapper, so that when its called a warning is printed
+        telling where the object can be found, import is done (and not before) and
+        the actual object is called.
+
+        NOTE: the usage is somewhat limited on classes since it will fail if the
+        wrapper is use in a class ancestors list, use the `class_moved` function
+        instead (which has no lazy import feature though).
+        """
+        def callnew(*args, **kwargs):
+            from logilab.common.modutils import load_module_from_name
+            message = "object %s has been moved to module %s" % (objname, modpath)
+            self.warn(version, message)
+            m = load_module_from_name(modpath)
+            return getattr(m, objname)(*args, **kwargs)
+        return callnew
+
+    def class_renamed(self, version, old_name, new_class, message=None):
+        clsdict = {}
+        if message is None:
+            message = '%s is deprecated, use %s' % (old_name, new_class.__name__)
+        clsdict['__deprecation_warning__'] = message
+        try:
+            # new-style class
+            return self.class_deprecated(version)(old_name, (new_class,), clsdict)
+        except (NameError, TypeError):
+            # old-style class
+            class DeprecatedClass(new_class):
+                """FIXME: There might be a better way to handle old/new-style class
+                """
+                def __init__(self, *args, **kwargs):
+                    self.warn(version, message, stacklevel=3)
+                    new_class.__init__(self, *args, **kwargs)
+            return DeprecatedClass
+
+    def class_moved(self, version, new_class, old_name=None, message=None):
+        """nice wrapper around class_renamed when a class has been moved into
+        another module
+        """
+        if old_name is None:
+            old_name = new_class.__name__
+        if message is None:
+            message = 'class %s is now available as %s.%s' % (
+                old_name, new_class.__module__, new_class.__name__)
+        return self.class_renamed(version, old_name, new_class, message)
+
+    def warn(self, version=None, reason="", stacklevel=2):
+        """Display a deprecation message only if the version is older than the
+        compatible version.
+        """
+        if (self.compatible_version is None
+            or version is None
+            or Version(version) < self.compatible_version):
+            if self.module_name and version:
+                reason = '[%s %s] %s' % (self.module_name, version, reason)
+            elif self.module_name:
+                reason = '[%s] %s' % (self.module_name, reason)
+            elif version:
+                reason = '[%s] %s' % (version, reason)
+            warn(reason, DeprecationWarning, stacklevel=stacklevel)
+
+_defaultdeprecator = DeprecationManager()
+
+def deprecated(reason=None, stacklevel=2, name=None, doc=None):
+    return _defaultdeprecator.deprecated(None, reason, stacklevel, name, doc)
+
+class_deprecated = _defaultdeprecator.class_deprecated()
+
+def moved(modpath, objname):
+    return _defaultdeprecator.moved(None, modpath, objname)
+moved.__doc__ = _defaultdeprecator.moved.__doc__
 
 def class_renamed(old_name, new_class, message=None):
     """automatically creates a class which fires a DeprecationWarning
     when instantiated.
 
     >>> Set = class_renamed('Set', set, 'Set is now replaced by set')
     >>> s = Set()
     sample.py:57: DeprecationWarning: Set is now replaced by set
-      s = Set()
+    s = Set()
     >>>
     """
-    clsdict = {}
-    if message is None:
-        message = '%s is deprecated, use %s' % (old_name, new_class.__name__)
-    clsdict['__deprecation_warning__'] = message
-    try:
-        # new-style class
-        return class_deprecated(old_name, (new_class,), clsdict)
-    except (NameError, TypeError):
-        # old-style class
-        class DeprecatedClass(new_class):
-            """FIXME: There might be a better way to handle old/new-style class
-            """
-            def __init__(self, *args, **kwargs):
-                warn(message, DeprecationWarning, stacklevel=2)
-                new_class.__init__(self, *args, **kwargs)
-        return DeprecatedClass
-
+    return _defaultdeprecator.class_renamed(None, old_name, new_class, message)
 
 def class_moved(new_class, old_name=None, message=None):
-    """nice wrapper around class_renamed when a class has been moved into
-    another module
-    """
-    if old_name is None:
-        old_name = new_class.__name__
-    if message is None:
-        message = 'class %s is now available as %s.%s' % (
-            old_name, new_class.__module__, new_class.__name__)
-    return class_renamed(old_name, new_class, message)
+    return _defaultdeprecator.class_moved(None, new_class, old_name, message)
+class_moved.__doc__ = _defaultdeprecator.class_moved.__doc__
 
-def deprecated(reason=None, stacklevel=2, name=None, doc=None):
-    """Decorator that raises a DeprecationWarning to print a message
-    when the decorated function is called.
-    """
-    def deprecated_decorator(func):
-        message = reason or 'The function "%s" is deprecated'
-        if '%s' in message:
-            message = message % func.func_name
-        def wrapped(*args, **kwargs):
-            warn(message, DeprecationWarning, stacklevel=stacklevel)
-            return func(*args, **kwargs)
-        try:
-            wrapped.__name__ = name or func.__name__
-        except TypeError: # readonly attribute in 2.3
-            pass
-        wrapped.__doc__ = doc or func.__doc__
-        return wrapped
-    return deprecated_decorator
-
-def moved(modpath, objname):
-    """use to tell that a callable has been moved to a new module.
-
-    It returns a callable wrapper, so that when its called a warning is printed
-    telling where the object can be found, import is done (and not before) and
-    the actual object is called.
-
-    NOTE: the usage is somewhat limited on classes since it will fail if the
-    wrapper is use in a class ancestors list, use the `class_moved` function
-    instead (which has no lazy import feature though).
-    """
-    def callnew(*args, **kwargs):
-        from logilab.common.modutils import load_module_from_name
-        message = "object %s has been moved to module %s" % (objname, modpath)
-        warn(message, DeprecationWarning, stacklevel=2)
-        m = load_module_from_name(modpath)
-        return getattr(m, objname)(*args, **kwargs)
-    return callnew
-
-