1 files changed, 94 insertions, 0 deletions
diff --git a/src/mailman/styles/manager.py b/src/mailman/styles/manager.py
new file mode 100644
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--- /dev/null
+++ b/src/mailman/styles/manager.py
@@ -0,0 +1,94 @@
+# Copyright (C) 2007-2009 by the Free Software Foundation, Inc.
+#
+# This file is part of GNU Mailman.
+#
+# GNU Mailman 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.
+#
+# GNU Mailman 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
+# GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Style manager."""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'StyleManager',
+    ]
+
+
+import sys
+
+from operator import attrgetter
+from zope.interface import implements
+from zope.interface.verify import verifyObject
+
+from mailman.interfaces.styles import (
+    DuplicateStyleError, IStyle, IStyleManager)
+
+
+
+class StyleManager:
+    """The built-in style manager."""
+
+    implements(IStyleManager)
+
+    def __init__(self):
+        """Install all styles from the configuration files."""
+        self._styles = {}
+
+    def populate(self):
+        self._styles.clear()
+        # Avoid circular imports.
+        from mailman.config import config
+        # Install all the styles described by the configuration files.
+        for section in config.style_configs:
+            class_path = section['class']
+            module_name, class_name = class_path.rsplit('.', 1)
+            __import__(module_name)
+            style = getattr(sys.modules[module_name], class_name)()
+            assert section.name.startswith('style'), (
+                'Bad style section name: %s' % section.name)
+            style.name = section.name[6:]
+            style.priority = int(section.priority)
+            self.register(style)
+
+    def get(self, name):
+        """See `IStyleManager`."""
+        return self._styles.get(name)
+
+    def lookup(self, mailing_list):
+        """See `IStyleManager`."""
+        matched_styles = []
+        for style in self.styles:
+            style.match(mailing_list, matched_styles)
+        for style in matched_styles:
+            yield style
+
+    @property
+    def styles(self):
+        """See `IStyleManager`."""
+        for style in sorted(self._styles.values(),
+                            key=attrgetter('priority'),
+                            reverse=True):
+            yield style
+
+    def register(self, style):
+        """See `IStyleManager`."""
+        verifyObject(IStyle, style)
+        if style.name in self._styles:
+            raise DuplicateStyleError(style.name)
+        self._styles[style.name] = style
+
+    def unregister(self, style):
+        """See `IStyleManager`."""
+        # Let KeyErrors percolate up.
+        del self._styles[style.name]