--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pyink/extensions.py	Mon Feb 07 21:54:03 2011 +0800
@@ -0,0 +1,39 @@
+import pybExtension
+import html5css3
+
+_all_extensions = [html5css3.extension]
+
+_DEBUG_FLAG_NAME = 'PYINK_EXT_DBG_ENABLE'
+
+def _reg_extensions():
+    import os
+
+    if os.environ.has_key(_DEBUG_FLAG_NAME):
+        debug_level = int(os.environ[_DEBUG_FLAG_NAME])
+    else:
+        debug_level = 0
+        pass
+    
+    if debug_level > 0:
+        print 'Loading extensions'
+        pass
+    
+    for ext_imp, ext_id, ext_name, ioe_name, ioe_items in _all_extensions:
+        if debug_level > 0:
+            print '    register %s -- %s' % (ext_id, ext_name)
+            pass
+        
+        #
+        # ioe_items is description items for input, output, and effect.
+        #
+        if ioe_name not in ('input', 'output', 'effect'):
+            raise ValueError, 'invalid extension type (%s)' % (ioe_name)
+        
+        kws = {ioe_name: ioe_items}
+        pybExtension.register_extension(ext_imp, ext_id, ext_name, **kws)
+        pass
+    pass
+
+def initial():
+    _reg_extensions()
+    pass