provide utilities package with getSchemaFromInterface() function that dynamically creates a schema

git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@1992 fd906abe-77d9-0310-91a1-e0d9ade77398

composer/schema/util.py

@@ -0,0 +1,64 @@
+#
+#  Copyright (c) 2007 Helmut Merz helmutm@cy55.de
+#
+#  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 2 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+
+"""
+Utility functions.
+
+$Id$
+"""
+
+from zope import schema
+from cybertools.composer.schema.schema import Schema
+from cybertools.composer.schema.field import Field
+
+
+fieldMapping = {
+        schema.TextLine: ('text',),
+        schema.ASCII: ('text',),
+        schema.Text: ('textarea',),
+        schema.Date: ('date',),
+        schema.Int: ('number',),
+        schema.Bool: ('checkbox',),
+        schema.Choice: ('dropdown',),
+}
+
+
+def getSchemaFromInterface(ifc, manager):
+    fields = []
+    for fname in schema.getFieldNamesInOrder(ifc):
+        field = ifc[fname]
+        if field.__class__ in fieldMapping:
+            info = fieldMapping[field.__class__]
+            voc = getattr(field, 'vocabulary', ()) or getattr(field, 'vocabularyName', ())
+            if voc:
+                if isinstance(voc, str):
+                    voc = vocabularies[voc]
+                else:
+                    voc = [(t.token, t.title or t.token) for t in voc]
+            f = Field(field.getName(),
+                    fieldType = info[0],
+                    required=field.required,
+                    default=field.default,
+                    default_method=getattr(field, 'default_method', None),
+                    vocabulary=voc,
+                    title=field.title,
+                    description=field.description)
+            fields.append(f)
+    return Schema(manager=manager, name=ifc.__name__, *fields)
+
+