initial commitv1

1 files changed, 81 insertions, 0 deletions

diff --git a/ka_extensionpoint.py b/ka_extensionpoint.py
new file mode 100644
index 0000000..1f6067f
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+++ b/ka_extensionpoint.py
@@ -0,0 +1,81 @@
+# coding: UTF8
+# Copyright 2009 Thomas Jourdan
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+import os
+#import types
+import ka_debug
+
+_PREFIX = 'ep_'
+_PYEXT = '.py'
+_SEP = '_'
+
+_extension_types = []
+_extensions = []
+
+def list_extensions(extension_type):
+    """
+    pre: extension_type in _extension_types
+    """
+    e_list = []
+    for extension_class in _extensions:
+        if extension_class.startswith(extension_type + _SEP):
+            e_list.append(extension_class)
+    e_list.sort()
+    return e_list
+
+def list_extension_types():
+    return _extension_types
+
+def create(extension_key, *params):
+    """
+    pre: extension_key in _extensions
+    post: __return__ is not None
+    """
+    a_module = __import__('ep_' + extension_key)
+    for key, value in a_module.__dict__.iteritems():
+#        print '-- ', str(type(value)), key
+        if str(type(value)) == "<type 'type'>":
+            a_class = getattr(a_module, key)
+            return a_class(*params)
+#            if len(params) == 0:
+#                return a_class()
+#            elif len(params) == 1:
+#                return a_class(params[0])
+
+def _add(extension_type, extension_class):
+    if extension_type not in _extension_types:
+        _extension_types.append(extension_type)
+    e_key = extension_type + _SEP + extension_class
+    if e_key not in _extensions:
+        _extensions.append(e_key)
+
+def scann():
+    bundle_path = ka_debug.DEBUG_PATH
+    if 'SUGAR_BUNDLE_PATH' in os.environ:
+        from sugar.activity import activity
+        bundle_path = activity.get_bundle_path()
+    ka_debug.info('searching for extensions in ' + bundle_path)
+    for element in os.listdir(bundle_path):
+        if element.startswith(_PREFIX) and element.endswith(_PYEXT) \
+           and os.path.isfile(os.path.join(bundle_path, element)):
+            name_parts = element.split(_SEP)
+            if len(name_parts) == 3:
+                _add(name_parts[1], name_parts[2].replace(_PYEXT, ''))
+    _extension_types.sort()
+    _extensions.sort()
+
+scann()
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