Merge branch 'justus/pyme3'

1 files changed, 97 insertions, 0 deletions

diff --git a/lang/python/pyme/util.py b/lang/python/pyme/util.py
new file mode 100644
index 00000000..3c34c79e
--- /dev/null
+++ b/lang/python/pyme/util.py
@@ -0,0 +1,97 @@
+# $Id$
+# Copyright (C) 2004,2008 Igor Belyi <[email protected]>
+# Copyright (C) 2002 John Goerzen <[email protected]>
+#
+#    This library 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.
+#
+#    This library 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 this library; if not, write to the Free Software
+#    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+
+from . import pygpgme
+from .errors import errorcheck
+
+def process_constants(starttext, dict):
+    """Called by the constant libraries to load up the appropriate constants
+    from the C library."""
+    index = len(starttext)
+    for identifier in dir(pygpgme):
+        if not identifier.startswith(starttext):
+            continue
+        name = identifier[index:]
+        dict[name] = getattr(pygpgme, identifier)
+
+class GpgmeWrapper(object):
+    """Base class all Pyme wrappers for GPGME functionality.  Not to be
+    instantiated directly."""
+    def __repr__(self):
+        return '<instance of %s.%s with GPG object at %s>' % \
+               (__name__, self.__class__.__name__,
+                self.wrapped)
+
+    def __str__(self):
+        return repr(self)
+
+    def __hash__(self):
+        return hash(repr(self.wrapped))
+
+    def __eq__(self, other):
+        if other == None:
+            return False
+        else:
+            return repr(self.wrapped) == repr(other.wrapped)
+
+    def _getctype(self):
+        """Must be implemented by child classes.
+
+        Must return the name of the c type."""
+        raise NotImplementedError()
+
+    def _getnameprepend(self):
+        """Must be implemented by child classes.
+
+        Must return the prefix of all c functions mapped to methods of
+        this class."""
+        raise NotImplementedError()
+
+    def _errorcheck(self, name):
+        """Must be implemented by child classes.
+
+        This function must return a trueish value for all c functions
+        returning gpgme_error_t."""
+        raise NotImplementedError()
+
+    def __getattr__(self, key):
+        """On-the-fly function generation."""
+        if key[0] == '_' or self._getnameprepend() == None:
+            return None
+        name = self._getnameprepend() + key
+        func = getattr(pygpgme, name)
+
+        if self._errorcheck(name):
+            def _funcwrap(slf, *args, **kwargs):
+                return errorcheck(func(slf.wrapped, *args, **kwargs),
+                                  "Invocation of " + name)
+        else:
+            def _funcwrap(slf, *args, **kwargs):
+                return func(slf.wrapped, *args, **kwargs)
+
+        _funcwrap.__doc__ = getattr(func, "__doc__")
+
+        # Monkey-patch the class.
+        setattr(self.__class__, key, _funcwrap)
+
+        # Bind the method to 'self'.
+        def wrapper(*args, **kwargs):
+            return _funcwrap(self, *args, **kwargs)
+        _funcwrap.__doc__ = getattr(func, "__doc__")
+
+        return wrapper