web/views/__init__.py
author Aurelien Campeas <aurelien.campeas@logilab.fr>
Mon, 06 Jan 2014 12:01:35 +0100
changeset 9383 7b3fa5a7a5a3
parent 7806 aa30c665bd06
child 9700 da7d341cca76
permissions -rw-r--r--
[views/dot] use an inlined svg for schema and workflow graphs These are currently served as "temporary" pngs which are actually consummed immediately. Which means they cannot be requested twice and any further attempt will yield an error in the logs and some end-user surprise. There is no known acceptable workaround for IE-8 (and previous versions). SVGWEB could be workable but it's not trivial to integrate it properly. Closes #3400448.

# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
"""Views, forms, actions... for the CubicWeb web client"""

__docformat__ = "restructuredtext en"

import os
import sys
import tempfile

from rql import nodes
from logilab.mtconverter import xml_escape
from logilab.common.deprecation import class_deprecated


def need_table_view(rset, schema):
    """return True if we think that a table view is more appropriate than a
    list or primary view to display the given result set
    """
    rqlst = rset.syntax_tree()
    if len(rqlst.children) > 1:
        # UNION query, use a table
        return True
    selected = rqlst.children[0].selection
    try:
        mainvar = selected[0]
    except AttributeError:
        # not a variable ref, using table view is probably a good option
        return True
    if not (isinstance(mainvar, nodes.VariableRef) or
            (isinstance(mainvar, nodes.Constant) and mainvar.uid)):
        return True
    for i, etype in enumerate(rset.description[0][1:]):
        # etype may be None on outer join
        if etype is None:
            return True
        # check the selected index node is a VariableRef (else we
        # won't detect aggregate function
        if not isinstance(selected[i+1], nodes.VariableRef):
            return True
        # if this is not a final entity
        if not schema.eschema(etype).final:
            return True
        # if this is a final entity not linked to the main variable
        var = selected[i+1].variable
        for vref in var.references():
            rel = vref.relation()
            if rel is None:
                continue
            if mainvar.is_equivalent(rel.children[0]):
                break
        else:
            return True
    return False

# FIXME: VID_BY_MIMETYPE is unfortunately a bit too naive since
#        some browsers (e.g. FF2) send a bunch of mimetypes in
#        the Accept header, for instance:
#          text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,
#          text/plain;q=0.8,image/png,*/*;q=0.5
VID_BY_MIMETYPE = {
    #'text/xml': 'xml',
    # XXX rss, owl...
}
def vid_from_rset(req, rset, schema):
    """given a result set, return a view id"""
    if rset is None:
        return 'index'
    for mimetype in req.parse_accept_header('Accept'):
        if mimetype in VID_BY_MIMETYPE:
            return VID_BY_MIMETYPE[mimetype]
    nb_rows = len(rset)
    # empty resultset
    if nb_rows == 0:
        return 'noresult'
    # entity result set
    if not schema.eschema(rset.description[0][0]).final:
        if need_table_view(rset, schema):
            return 'table'
        if nb_rows == 1:
            if req.search_state[0] == 'normal':
                return 'primary'
            return 'outofcontext-search'
        if len(rset.column_types(0)) == 1:
            return 'sameetypelist'
        return 'list'
    return 'table'


def linksearch_select_url(req, rset):
    """when searching an entity to create a relation, return an url to select
    entities in the given rset
    """
    req.add_js( ('cubicweb.ajax.js', 'cubicweb.edition.js') )
    target, eid, r_type, searchedtype = req.search_state[1]
    if target == 'subject':
        id_fmt = '%s:%s:%%s' % (eid, r_type)
    else:
        id_fmt = '%%s:%s:%s' % (r_type, eid)
    triplets = '-'.join(id_fmt % row[0] for row in rset.rows)
    return "javascript: selectForAssociation('%s', '%s');" % (triplets, eid)


def add_etype_button(req, etype, csscls='addButton right', **urlkwargs):
    vreg = req.vreg
    eschema = vreg.schema.eschema(etype)
    if eschema.has_perm(req, 'add'):
        url = vreg['etypes'].etype_class(etype).cw_create_url(req, **urlkwargs)
        return u'<a href="%s" class="%s">%s</a>' % (
            xml_escape(url), csscls, req.__('New %s' % etype))
    return u''



class TmpFileViewMixin(object):
    __metaclass__ = class_deprecated
    __deprecation_warning__ = '[3.18] %(cls)s is deprecated'
    binary = True
    content_type = 'application/octet-stream'
    cache_max_age = 60*60*2 # stay in http cache for 2 hours by default

    def call(self):
        self.cell_call()

    def cell_call(self, row=0, col=0):
        self.cw_row, self.cw_col = row, col # in case one needs it
        fd, tmpfile = tempfile.mkstemp('.png')
        os.close(fd)
        self._generate(tmpfile)
        self.w(open(tmpfile, 'rb').read())
        os.unlink(tmpfile)