web/views/__init__.py
author Aurelien Campeas
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"""Views, forms, actions... for the 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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import os
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import sys
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import tempfile
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from rql import nodes
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def need_table_view(rset, schema):
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    """return True if we think that a table view is more appropriate than a
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    list or primary view to display the given result set
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    """
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    rqlst = rset.syntax_tree()
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    if len(rqlst.children) > 1:
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        # UNION query, use a table
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        return True
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    selected = rqlst.children[0].selection
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    try:
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        mainvar = selected[0]
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    except AttributeError:
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        # not a variable ref, using table view is probably a good option
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        return True
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    if not (isinstance(mainvar, nodes.VariableRef) or
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            (isinstance(mainvar, nodes.Constant) and mainvar.uid)):
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        return True
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    for i, etype in enumerate(rset.description[0][1:]):
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        # etype may be None on outer join
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        if etype is None:
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            return True
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        # check the selected index node is a VariableRef (else we
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        # won't detect aggregate function
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        if not isinstance(selected[i+1], nodes.VariableRef):
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            return True
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        # if this is not a final entity
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        if not schema.eschema(etype).is_final():
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            return True
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        # if this is a final entity not linked to the main variable
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        var = selected[i+1].variable
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        for vref in var.references():
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            rel = vref.relation()
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            if rel is None:
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                continue
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            if mainvar.is_equivalent(rel.children[0]):
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                break
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        else:
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            return True
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    return False
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# FIXME: VID_BY_MIMETYPE is unfortunately a bit too naive since
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#        some browsers (e.g. FF2) send a bunch of mimetypes in
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#        the Accept header, for instance:
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#          text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,
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#          text/plain;q=0.8,image/png,*/*;q=0.5
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VID_BY_MIMETYPE = {
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    #'text/xml': 'xml',
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    # XXX rss, owl...
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}
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def vid_from_rset(req, rset, schema):
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    """given a result set, return a view id"""
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    if rset is None:
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        return 'index'
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    for mimetype in req.parse_accept_header('Accept'):
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        if mimetype in VID_BY_MIMETYPE:
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            return VID_BY_MIMETYPE[mimetype]
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    nb_rows = len(rset)
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    # empty resultset
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    if nb_rows == 0 :
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        return 'noresult'
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    # entity result set
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    if not schema.eschema(rset.description[0][0]).is_final():
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        if need_table_view(rset, schema):
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            return 'table'
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        if nb_rows == 1:
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            if req.search_state[0] == 'normal':
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                return 'primary'
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            return 'outofcontext-search'
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        if len(rset.column_types(0)) == 1:
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            return 'adaptedlist'
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        return 'list'
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    return 'table'
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def linksearch_select_url(req, rset):
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    """when searching an entity to create a relation, return an url to select
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    entities in the given rset
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    """
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    req.add_js( ('cubicweb.ajax.js', 'cubicweb.edition.js') )
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    target, eid, r_type, searchedtype = req.search_state[1]
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    if target == 'subject':
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        id_fmt = '%s:%s:%%s' % (eid, r_type)
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    else:
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        id_fmt = '%%s:%s:%s' % (r_type, eid)
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    triplets = '-'.join(id_fmt % row[0] for row in rset.rows)
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    return "javascript: selectForAssociation('%s', '%s');" % (triplets, eid)
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class TmpFileViewMixin(object):
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    binary = True
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    content_type = 'application/octet-stream'
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    cache_max_age = 60*60*2 # stay in http cache for 2 hours by default
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    def call(self):
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        self.cell_call()
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    def cell_call(self, row=0, col=0):
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        self.row, self.col = row, col # in case one needs it
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        fd, tmpfile = tempfile.mkstemp('.png')
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        os.close(fd)
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        self._generate(tmpfile)
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        self.w(open(tmpfile, 'rb').read())
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        os.unlink(tmpfile)