"""abstract views and templates classes for CubicWeb web client
:organization: Logilab
:copyright: 2001-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
"""
__docformat__ = "restructuredtext en"
from cStringIO import StringIO
from logilab.mtconverter import html_escape
from cubicweb import NotAnEntity, NoSelectableObject
from cubicweb.common.registerers import accepts_registerer, priority_registerer
from cubicweb.common.selectors import (in_group_selector, anyrset_selector,
emptyrset_selector, accept_selector,
norset_selector, chainfirst)
from cubicweb.common.appobject import AppRsetObject, ComponentMixIn
from cubicweb.common.utils import UStringIO, HTMLStream
_ = unicode
# robots control
NOINDEX = u'<meta name="ROBOTS" content="NOINDEX" />'
NOFOLLOW = u'<meta name="ROBOTS" content="NOFOLLOW" />'
CW_XHTML_EXTENSIONS = '''[
<!ATTLIST html xmlns:cubicweb CDATA #FIXED \'http://www.logilab.org/2008/cubicweb\' >
<!ENTITY % coreattrs
"id ID #IMPLIED
class CDATA #IMPLIED
style CDATA #IMPLIED
title CDATA #IMPLIED
cubicweb:sortvalue CDATA #IMPLIED
cubicweb:target CDATA #IMPLIED
cubicweb:limit CDATA #IMPLIED
cubicweb:type CDATA #IMPLIED
cubicweb:loadtype CDATA #IMPLIED
cubicweb:wdgtype CDATA #IMPLIED
cubicweb:initfunc CDATA #IMPLIED
cubicweb:inputid CDATA #IMPLIED
cubicweb:tindex CDATA #IMPLIED
cubicweb:inputname CDATA #IMPLIED
cubicweb:value CDATA #IMPLIED
cubicweb:required CDATA #IMPLIED
cubicweb:accesskey CDATA #IMPLIED
cubicweb:maxlength CDATA #IMPLIED
cubicweb:variables CDATA #IMPLIED
cubicweb:displayactions CDATA #IMPLIED
cubicweb:fallbackvid CDATA #IMPLIED
cubicweb:vid CDATA #IMPLIED
cubicweb:rql CDATA #IMPLIED
cubicweb:actualrql CDATA #IMPLIED
cubicweb:rooteid CDATA #IMPLIED
cubicweb:dataurl CDATA #IMPLIED
cubicweb:size CDATA #IMPLIED
cubicweb:tlunit CDATA #IMPLIED
cubicweb:loadurl CDATA #IMPLIED
cubicweb:uselabel CDATA #IMPLIED
"> ] '''
TRANSITIONAL_DOCTYPE = u'<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" %s>\n'
STRICT_DOCTYPE = u'<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd" %s>\n'
class View(AppRsetObject):
"""abstract view class, used as base for every renderable object such
as views, templates, some components...web
A view is instantiated to render a [part of a] result set. View
subclasses may be parametred using the following class attributes:
* `templatable` indicates if the view may be embeded in a main
template or if it has to be rendered standalone (i.e. XML for
instance)
* if the view is not templatable, it should set the `content_type` class
attribute to the correct MIME type (text/xhtml by default)
* the `category` attribute may be used in the interface to regroup related
objects together
At instantiation time, the standard `req`, `rset`, and `cursor`
attributes are added and the `w` attribute will be set at rendering
time to a write function to use.
"""
__registry__ = 'views'
templatable = True
need_navigation = True
# content_type = 'application/xhtml+xml' # text/xhtml'
binary = False
add_to_breadcrumbs = True
category = 'view'
def __init__(self, req, rset):
super(View, self).__init__(req, rset)
self.w = None
@property
def content_type(self):
if self.req.xhtml_browser():
return 'application/xhtml+xml'
return 'text/html'
def set_stream(self, w=None):
if self.w is not None:
return
if w is None:
if self.binary:
self._stream = stream = StringIO()
else:
self._stream = stream = UStringIO()
w = stream.write
else:
stream = None
self.w = w
return stream
# main view interface #####################################################
def dispatch(self, w=None, **context):
"""called to render a view object for a result set.
This method is a dispatched to an actual method selected
according to optional row and col parameters, which are locating
a particular row or cell in the result set:
* if row [and col] are specified, `cell_call` is called
* if none of them is supplied, the view is considered to apply on
the whole result set (which may be None in this case), `call` is
called
"""
row, col = context.get('row'), context.get('col')
if row is not None:
context.setdefault('col', 0)
view_func = self.cell_call
else:
view_func = self.call
stream = self.set_stream(w)
# stream = self.set_stream(context)
view_func(**context)
# return stream content if we have created it
if stream is not None:
return self._stream.getvalue()
# should default .call() method add a <div classs="section"> around each
# rset item
add_div_section = True
def call(self, **kwargs):
"""the view is called for an entire result set, by default loop
other rows of the result set and call the same view on the
particular row
Views applicable on None result sets have to override this method
"""
rset = self.rset
if rset is None:
raise NotImplementedError, self
wrap = self.templatable and len(rset) > 1 and self.add_div_section
for i in xrange(len(rset)):
if wrap:
self.w(u'<div class="section">')
self.wview(self.id, rset, row=i, **kwargs)
if wrap:
self.w(u"</div>")
def cell_call(self, row, col, **kwargs):
"""the view is called for a particular result set cell"""
raise NotImplementedError, self
def linkable(self):
"""return True if the view may be linked in a menu
by default views without title are not meant to be displayed
"""
if not getattr(self, 'title', None):
return False
return True
def is_primary(self):
return self.id == 'primary'
def url(self):
"""return the url associated with this view. Should not be
necessary for non linkable views, but a default implementation
is provided anyway.
"""
try:
return self.build_url(vid=self.id, rql=self.req.form['rql'])
except KeyError:
return self.build_url(vid=self.id)
def set_request_content_type(self):
"""set the content type returned by this view"""
self.req.set_content_type(self.content_type)
# view utilities ##########################################################
def view(self, __vid, rset, __fallback_vid=None, **kwargs):
"""shortcut to self.vreg.render method avoiding to pass self.req"""
try:
view = self.vreg.select_view(__vid, self.req, rset, **kwargs)
except NoSelectableObject:
if __fallback_vid is None:
raise
view = self.vreg.select_view(__fallback_vid, self.req, rset, **kwargs)
return view.dispatch(**kwargs)
def wview(self, __vid, rset, __fallback_vid=None, **kwargs):
"""shortcut to self.view method automatically passing self.w as argument
"""
self.view(__vid, rset, __fallback_vid, w=self.w, **kwargs)
def whead(self, data):
self.req.html_headers.write(data)
def wdata(self, data):
"""simple helper that escapes `data` and writes into `self.w`"""
self.w(html_escape(data))
def action(self, actionid, row=0):
"""shortcut to get action object with id `actionid`"""
return self.vreg.select_action(actionid, self.req, self.rset,
row=row)
def action_url(self, actionid, label=None, row=0):
"""simple method to be able to display `actionid` as a link anywhere
"""
action = self.vreg.select_action(actionid, self.req, self.rset,
row=row)
if action:
label = label or self.req._(action.title)
return u'<a href="%s">%s</a>' % (html_escape(action.url()), label)
return u''
def html_headers(self):
"""return a list of html headers (eg something to be inserted between
<head> and </head> of the returned page
by default return a meta tag to disable robot indexation of the page
"""
return [NOINDEX]
def page_title(self):
"""returns a title according to the result set - used for the
title in the HTML header
"""
vtitle = self.req.form.get('vtitle')
if vtitle:
return self.req._(vtitle)
# class defined title will only be used if the resulting title doesn't
# seem clear enough
vtitle = getattr(self, 'title', None) or u''
if vtitle:
vtitle = self.req._(vtitle)
rset = self.rset
if rset and rset.rowcount:
if rset.rowcount == 1:
try:
entity = self.complete_entity(0)
# use long_title to get context information if any
clabel = entity.dc_long_title()
except NotAnEntity:
clabel = display_name(self.req, rset.description[0][0])
clabel = u'%s (%s)' % (clabel, vtitle)
else :
etypes = rset.column_types(0)
if len(etypes) == 1:
etype = iter(etypes).next()
clabel = display_name(self.req, etype, 'plural')
else :
clabel = u'#[*] (%s)' % vtitle
else:
clabel = vtitle
return u'%s (%s)' % (clabel, self.req.property_value('ui.site-title'))
def output_url_builder( self, name, url, args ):
self.w(u'<script language="JavaScript"><!--\n' \
u'function %s( %s ) {\n' % (name, ','.join(args) ) )
url_parts = url.split("%s")
self.w(u' url="%s"' % url_parts[0] )
for arg, part in zip(args, url_parts[1:]):
self.w(u'+str(%s)' % arg )
if part:
self.w(u'+"%s"' % part)
self.w('\n document.window.href=url;\n')
self.w('}\n-->\n</script>\n')
def create_url(self, etype, **kwargs):
""" return the url of the entity creation form for a given entity type"""
return self.req.build_url('add/%s'%etype, **kwargs)
# concrete views base classes #################################################
class EntityView(View):
"""base class for views applying on an entity (i.e. uniform result set)
"""
__registerer__ = accepts_registerer
__selectors__ = (accept_selector,)
category = 'entityview'
def field(self, label, value, row=True, show_label=True, w=None, tr=True):
""" read-only field """
if w is None:
w = self.w
if row:
w(u'<div class="row">')
if show_label:
if tr:
label = display_name(self.req, label)
w(u'<span class="label">%s</span>' % label)
w(u'<div class="field">%s</div>' % value)
if row:
w(u'</div>')
class StartupView(View):
"""base class for views which doesn't need a particular result set
to be displayed (so they can always be displayed !)
"""
__registerer__ = priority_registerer
__selectors__ = (in_group_selector, norset_selector)
require_groups = ()
category = 'startupview'
def url(self):
"""return the url associated with this view. We can omit rql here"""
return self.build_url('view', vid=self.id)
def html_headers(self):
"""return a list of html headers (eg something to be inserted between
<head> and </head> of the returned page
by default startup views are indexed
"""
return []
class EntityStartupView(EntityView):
"""base class for entity views which may also be applied to None
result set (usually a default rql is provided by the view class)
"""
__registerer__ = accepts_registerer
__selectors__ = (chainfirst(norset_selector, accept_selector),)
default_rql = None
def __init__(self, req, rset):
super(EntityStartupView, self).__init__(req, rset)
if rset is None:
# this instance is not in the "entityview" category
self.category = 'startupview'
def startup_rql(self):
"""return some rql to be executedif the result set is None"""
return self.default_rql
def call(self, **kwargs):
"""override call to execute rql returned by the .startup_rql
method if necessary
"""
if self.rset is None:
self.rset = self.req.execute(self.startup_rql())
rset = self.rset
for i in xrange(len(rset)):
self.wview(self.id, rset, row=i, **kwargs)
def url(self):
"""return the url associated with this view. We can omit rql if we
are on a result set on which we do not apply.
"""
if not self.__select__(self.req, self.rset):
return self.build_url(vid=self.id)
return super(EntityStartupView, self).url()
class AnyRsetView(View):
"""base class for views applying on any non empty result sets"""
__registerer__ = priority_registerer
__selectors__ = (anyrset_selector,)
category = 'anyrsetview'
class EmptyRsetView(View):
"""base class for views applying on any empty result sets"""
__registerer__ = priority_registerer
__selectors__ = (emptyrset_selector,)
# concrete template base classes ##############################################
class Template(View):
"""a template is almost like a view, except that by default a template
is only used globally (i.e. no result set adaptation)
"""
__registry__ = 'templates'
__registerer__ = priority_registerer
__selectors__ = (in_group_selector,)
require_groups = ()
def template(self, oid, **kwargs):
"""shortcut to self.registry.render method on the templates registry"""
w = kwargs.pop('w', self.w)
self.vreg.render('templates', oid, self.req, w=w, **kwargs)
class MainTemplate(Template):
"""main template are primary access point to render a full HTML page.
There is usually at least a regular main template and a simple fallback
one to display error if the first one failed
"""
base_doctype = STRICT_DOCTYPE
@property
def doctype(self):
if self.req.xhtml_browser():
return self.base_doctype % CW_XHTML_EXTENSIONS
return self.base_doctype % ''
def set_stream(self, w=None, templatable=True):
if templatable and self.w is not None:
return
if w is None:
if self.binary:
self._stream = stream = StringIO()
elif not templatable:
# not templatable means we're using a non-html view, we don't
# want the HTMLStream stuff to interfere during data generation
self._stream = stream = UStringIO()
else:
self._stream = stream = HTMLStream(self.req)
w = stream.write
else:
stream = None
self.w = w
return stream
def write_doctype(self, xmldecl=True):
assert isinstance(self._stream, HTMLStream)
self._stream.doctype = self.doctype
if not xmldecl:
self._stream.xmldecl = u''
# viewable components base classes ############################################
class VComponent(ComponentMixIn, View):
"""base class for displayable components"""
property_defs = {
'visible': dict(type='Boolean', default=True,
help=_('display the component or not')),}
class SingletonVComponent(VComponent):
"""base class for displayable unique components"""
__registerer__ = priority_registerer