Added printing requirements

z3c/rml/occurence.py

@@ -0,0 +1,113 @@
+##############################################################################
+#
+# Copyright (c) 2007 Zope Foundation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+"""Condition Implementation
+"""
+import reportlab
+import sys
+import zope.interface
+import zope.schema
+from zope.schema import fieldproperty
+
+class ICondition(zope.interface.Interface):
+    """Condition that is checked before a  directive is available."""
+
+    __doc__ = zope.schema.TextLine(
+        title=u'Description',
+        description=u'The description of the condition.',
+        required=True)
+
+    def __call__(directive):
+        """Check whether the condition is fulfilled for the given directive."""
+
+
+class IOccurence(zope.interface.Interface):
+    """Description of the occurence of a sub-directive."""
+
+    __doc__ = zope.schema.TextLine(
+        title=u'Description',
+        description=u'The description of the occurence.',
+        required=True)
+
+    tag = zope.schema.BytesLine(
+        title=u'Tag',
+        description=u'The tag of the sub-directive within the directive',
+        required=True)
+
+    signature = zope.schema.Field(
+        title=u'Signature',
+        description=u'The signature of the sub-directive.',
+        required=True)
+
+    condition = zope.schema.Field(
+        title=u'Condition',
+        description=u'The condition that the directive is available.',
+        required=False)
+
+
+@zope.interface.implementer(ICondition)
+def laterThanReportlab21(directive):
+    """The directive is only available in Reportlab 2.1 and higher."""
+    return [int(num) for num in reportlab.Version.split('.')] >= (2, 0)
+
+
+def containing(*occurences):
+    frame = sys._getframe(1)
+    f_locals = frame.f_locals
+    f_globals = frame.f_globals
+
+    if not (f_locals is not f_globals
+            and f_locals.get('__module__')
+            and f_locals.get('__module__') == f_globals.get('__name__')
+            ):
+        raise TypeError("contains not called from signature interface")
+
+    f_locals['__interface_tagged_values__'] = {'directives': occurences}
+
+
+class Occurence(object):
+    zope.interface.implements(IOccurence)
+
+    tag = fieldproperty.FieldProperty(IOccurence['tag'])
+    signature = fieldproperty.FieldProperty(IOccurence['signature'])
+    condition = fieldproperty.FieldProperty(IOccurence['condition'])
+
+    def __init__(self, tag, signature, condition=None):
+        self.tag = tag
+        self.signature = signature
+        self.condition = condition
+
+
+class ZeroOrMore(Occurence):
+    """Zero or More
+
+    This sub-directive can occur zero or more times.
+    """
+
+class ZeroOrOne(Occurence):
+    """Zero or one
+
+    This sub-directive can occur zero or one time.
+    """
+
+class OneOrMore(Occurence):
+    """One or More
+
+    This sub-directive can occur one or more times.
+    """
+
+class One(Occurence):
+    """One
+
+    This sub-directive must occur exactly one time.
+    """