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# Copyright (C) 2010 The University of Melbourne
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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import formencode.validators
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from genshi.filters import HTMLFormFiller
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from ivle.webapp.base.xhtml import XHTMLView
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class BaseFormView(XHTMLView):
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"""A base form view."""
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"""The FormEncode validator to use.
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The request will be passed in as state, after potentially being
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modified by populate_state().
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raise NotImplementedError()
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def populate_state(self, state):
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"""Populate the state given to the FormEncode validator.
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Subclasses can override this and set additional attributes.
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def get_return_url(self, obj):
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"""Return the URL to which the completed form should redirect.
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By default this will redirect to the saved object.
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return self.req.publisher.generate(obj)
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def get_default_data(self, req):
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"""Return a dict mapping field names to default form values.
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For an edit form, this should return the object's existing data.
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For a creation form, this should probably return an empty dict.
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This must be overridden by subclasses.
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raise NotImplementedError()
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def save_object(self, req, data):
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"""Take the validated form data and turn it into an object.
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The object must then be returned.
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For an edit form, this should just overwrite data on an existing
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For a creation form, this should create a new object with the given
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data and add it to the request's store.
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raise NotImplementedError()
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def filter(self, stream, ctx):
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return stream | HTMLFormFiller(data=ctx['data'])
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def populate(self, req, ctx):
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if req.method == 'POST':
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data = dict(req.get_fieldstorage())
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self.populate_state(req)
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data = self.validator.to_python(data, state=req)
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obj = self.save_object(req, data)
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req.throw_redirect(self.get_return_url(obj))
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except formencode.Invalid, e:
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errors = e.unpack_errors()
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data = self.get_default_data(req)
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ctx['context'] = self.context
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ctx['data'] = data or {}
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ctx['errors'] = errors
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# If all of the fields validated, set the global form error.
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if isinstance(errors, basestring):
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ctx['error_value'] = errors
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VALID_URL_NAME = re.compile(r'^[a-z0-9][a-z0-9_\+\.\-]*$')
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class URLNameValidator(formencode.validators.UnicodeString):
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def validate_python(self, value, state):
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super(URLNameValidator, self).validate_python(value, state)
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if not VALID_URL_NAME.match(value):
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raise formencode.Invalid(
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'Must consist of a lowercase alphanumeric character followed '
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'by any number of lowercase alphanumerics, ., +, - or _.',
added
removed
ivle/webapp/base/forms.py
