web/form.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Mon, 21 Dec 2009 18:43:16 +0100
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"""abstract form classes for CubicWeb web client
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:organization: Logilab
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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from logilab.common.decorators import iclassmethod
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from cubicweb.appobject import AppObject
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from cubicweb.view import NOINDEX, NOFOLLOW
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from cubicweb import tags
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from cubicweb.web import stdmsgs, httpcache, formfields
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class FormViewMixIn(object):
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    """abstract form view mix-in"""
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    category = 'form'
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    http_cache_manager = httpcache.NoHTTPCacheManager
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    add_to_breadcrumbs = False
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    def html_headers(self):
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        """return a list of html headers (eg something to be inserted between
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        <head> and </head> of the returned page
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        by default forms are neither indexed nor followed
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        """
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        return [NOINDEX, NOFOLLOW]
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    def linkable(self):
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        """override since forms are usually linked by an action,
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        so we don't want them to be listed by appli.possible_views
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        """
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        return False
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###############################################################################
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class metafieldsform(type):
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    """metaclass for FieldsForm to retrieve fields defined as class attributes
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    and put them into a single ordered list: '_fields_'.
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    """
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    def __new__(mcs, name, bases, classdict):
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        allfields = []
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        for base in bases:
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            if hasattr(base, '_fields_'):
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                allfields += base._fields_
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        clsfields = (item for item in classdict.items()
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                     if isinstance(item[1], formfields.Field))
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        for fieldname, field in sorted(clsfields, key=lambda x: x[1].creation_rank):
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            if not field.name:
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                field.set_name(fieldname)
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            allfields.append(field)
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        classdict['_fields_'] = allfields
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        return super(metafieldsform, mcs).__new__(mcs, name, bases, classdict)
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class FieldNotFound(Exception):
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    """raised by field_by_name when a field with the given name has not been
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    found
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    """
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class Form(AppObject):
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    __metaclass__ = metafieldsform
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    __registry__ = 'forms'
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    parent_form = None
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    force_session_key = None
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    def __init__(self, req, rset, **kwargs):
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        super(Form, self).__init__(req, rset=rset, **kwargs)
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        self.restore_previous_post(self.session_key())
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    @property
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    def root_form(self):
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        """return the root form"""
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        if self.parent_form is None:
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            return self
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        return self.parent_form.root_form
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    @property
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    def form_previous_values(self):
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        if self.parent_form is None:
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            return self._form_previous_values
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        return self.parent_form.form_previous_values
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    @property
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    def form_valerror(self):
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        if self.parent_form is None:
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            return self._form_valerror
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        return self.parent_form.form_valerror
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    @iclassmethod
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    def _fieldsattr(cls_or_self):
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        if isinstance(cls_or_self, type):
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            fields = cls_or_self._fields_
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        else:
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            fields = cls_or_self.fields
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        return fields
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    @iclassmethod
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    def field_by_name(cls_or_self, name, role='subject'):
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        """return field with the given name and role.
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        Raise FieldNotFound if the field can't be found.
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        """
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        for field in cls_or_self._fieldsattr():
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            if field.name == name and field.role == role:
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                return field
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        raise FieldNotFound(name)
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    @iclassmethod
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    def fields_by_name(cls_or_self, name, role='subject'):
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        """return a list of fields with the given name and role"""
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        return [field for field in cls_or_self._fieldsattr()
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                if field.name == name and field.role == role]
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    @iclassmethod
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    def remove_field(cls_or_self, field):
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        """remove a field from form class or instance"""
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        cls_or_self._fieldsattr().remove(field)
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    @iclassmethod
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    def append_field(cls_or_self, field):
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        """append a field to form class or instance"""
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        cls_or_self._fieldsattr().append(field)
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    @iclassmethod
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    def insert_field_before(cls_or_self, new_field, name, role='subject'):
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        field = cls_or_self.field_by_name(name, role)
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        fields = cls_or_self._fieldsattr()
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        fields.insert(fields.index(field), new_field)
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    @iclassmethod
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    def insert_field_after(cls_or_self, new_field, name, role='subject'):
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        field = cls_or_self.field_by_name(name, role)
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        fields = cls_or_self._fieldsattr()
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        fields.insert(fields.index(field)+1, new_field)
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    def session_key(self):
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        """return the key that may be used to store / retreive data about a
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        previous post which failed because of a validation error
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        """
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        if self.force_session_key is None:
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            return '%s#%s' % (self._cw.url(), self.domid)
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        return self.force_session_key
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    def restore_previous_post(self, sessionkey):
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        # get validation session data which may have been previously set.
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        # deleting validation errors here breaks form reloading (errors are
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        # no more available), they have to be deleted by application's publish
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        # method on successful commit
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        forminfo = self._cw.get_session_data(sessionkey, pop=True)
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        if forminfo:
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            # XXX remove _cw.data assigment once cw.web.widget is killed
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            self._cw.data['formvalues'] = self._form_previous_values = forminfo['values']
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            self._cw.data['formerrors'] = self._form_valerror = forminfo['errors']
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            self._cw.data['displayederrors'] = self.form_displayed_errors = set()
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            # if some validation error occured on entity creation, we have to
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            # get the original variable name from its attributed eid
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            foreid = self.form_valerror.entity
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            for var, eid in forminfo['eidmap'].items():
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                if foreid == eid:
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                    self.form_valerror.eid = var
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                    break
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            else:
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                self.form_valerror.eid = foreid
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        else:
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            self._form_previous_values = {}
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            self._form_valerror = None