1 #

     2 # Copyright (c) 2008-2015 Thierry Florac <tflorac AT ulthar.net>

     3 # All Rights Reserved.

     4 #

     5 # This software is subject to the provisions of the Zope Public License,

     6 # Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.

     7 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED

     8 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

     9 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS

    10 # FOR A PARTICULAR PURPOSE.

    11 #

    12 

    13 __docformat__ = 'restructuredtext'

    14 

    15 import re

    16 

    17 from chameleon.astutil import Symbol

    18 from chameleon.tales import StringExpr

    19 from pyramid_zope_request import PyramidPublisherRequest

    20 from zope.contentprovider.interfaces import BeforeUpdateEvent, ContentProviderLookupError, IContentProvider

    21 from zope.contentprovider.tales import addTALNamespaceData

    22 from zope.location.interfaces import ILocation

    23 

    24 from pyams_utils.tales import ContextExprMixin

    25 

    26 

    27 CONTENT_PROVIDER_NAME = re.compile('([A-Za-z0-9_\-\.]+)')

    28 

    29 

    30 def render_content_provider(econtext, name):

    31     match = CONTENT_PROVIDER_NAME.match(name.strip())

    32     if match:

    33         name = match.groups()[0]

    34     else:

    35         raise ContentProviderLookupError(name)

    36 

    37     context = econtext.get('context')

    38     request = econtext.get('request')

    39     if isinstance(request, PyramidPublisherRequest):

    40         request = request._request

    41     view = econtext.get('view')

    42 

    43     registry = request.registry

    44     provider = registry.queryMultiAdapter((context, request, view), IContentProvider, name=name)

    45 

    46     # provide a useful error message, if the provider was not found.

    47     if provider is None:

    48         raise ContentProviderLookupError(name)

    49 

    50     # add the __name__ attribute if it implements ILocation

    51     if ILocation.providedBy(provider):

    52         provider.__name__ = name

    53 

    54     # Insert the data gotten from the context

    55     addTALNamespaceData(provider, econtext)

    56 

    57     # Stage 1: Do the state update

    58     registry.notify(BeforeUpdateEvent(provider, request))

    59     provider.update()

    60 

    61     # Stage 2: Render the HTML content

    62     return provider.render()

    63 

    64 

    65 class ProviderExpr(ContextExprMixin, StringExpr):

    66     """provider: TALES expression"""

    67 

    68     transform = Symbol(render_content_provider)