schemaviewer.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Mon, 19 Oct 2009 17:03:31 +0200
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"""an helper class to display CubicWeb schema using ureports
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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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_ = unicode
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from logilab.common.ureports import Section, Title, Table, Link, Span, Text
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from yams.schema2dot import CARD_MAP
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I18NSTRINGS = [_('read'), _('add'), _('delete'), _('update'), _('order')]
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class SchemaViewer(object):
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    """return an ureport layout for some part of a schema"""
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    def __init__(self, req=None, encoding=None):
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        self.req = req
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        if req is not None:
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            self.req.add_css('cubicweb.schema.css')
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            self._possible_views = req.vreg['views'].possible_views
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            if not encoding:
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                encoding = req.encoding
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        else:
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            self._possible_views = lambda x: ()
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        self.encoding = encoding
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    def format_acls(self, schema, access_types):
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        """return a layout displaying access control lists"""
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        data = [self.req._('access type'), self.req._('groups')]
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        for access_type in access_types:
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            data.append(self.req._(access_type))
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            acls = [self.req._(group) for group in schema.get_groups(access_type)]
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            acls += (rqlexp.expression for rqlexp in schema.get_rqlexprs(access_type))
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            data.append(', '.join(acls))
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        return Section(children=(Table(cols=2, cheaders=1, rheaders=1, children=data),),
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                       klass='acl')
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    def visit_schema(self, schema, display_relations=0, skiptypes=()):
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        """get a layout for a whole schema"""
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        title = Title(self.req._('Schema %s') % schema.name,
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                      klass='titleUnderline')
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        layout = Section(children=(title,))
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        esection = Section(children=(Title(self.req._('Entities'),
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                                           klass='titleUnderline'),))
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        layout.append(esection)
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        eschemas = [eschema for eschema in schema.entities()
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                    if not (eschema.final or eschema in skiptypes)]
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        for eschema in sorted(eschemas):
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            esection.append(self.visit_entityschema(eschema, skiptypes))
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        if display_relations:
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            title = Title(self.req._('Relations'), klass='titleUnderline')
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            rsection = Section(children=(title,))
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            layout.append(rsection)
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            relations = [rschema for rschema in schema.relations()
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                         if not (rschema.final or rschema.type in skiptypes)]
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            keys = [(rschema.type, rschema) for rschema in relations]
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            for key, rschema in sorted(keys):
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                relstr = self.visit_relationschema(rschema)
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                rsection.append(relstr)
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        return layout
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    def _entity_attributes_data(self, eschema):
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        _ = self.req._
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        data = [_('attribute'), _('type'), _('default'), _('constraints')]
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        for rschema, aschema in eschema.attribute_definitions():
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            if not (rschema.has_local_role('read') or rschema.has_perm(self.req, 'read')):
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                continue
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            aname = rschema.type
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            if aname == 'eid':
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                continue
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            data.append('%s (%s)' % (aname, _(aname)))
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            data.append(_(aschema.type))
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            defaultval = eschema.default(aname)
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            if defaultval is not None:
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                default = self.to_string(defaultval)
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            elif eschema.rproperty(rschema, 'cardinality')[0] == '1':
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                default = _('required field')
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            else:
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                default = ''
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            data.append(default)
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            constraints = rschema.rproperty(eschema.type, aschema.type,
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                                            'constraints')
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            data.append(', '.join(str(constr) for constr in constraints))
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        return data
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    def eschema_link_url(self, eschema):
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        return self.req.build_url('cwetype/%s' % eschema)
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    def rschema_link_url(self, rschema):
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        return self.req.build_url('cwrtype/%s' % rschema)
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    def possible_views(self, etype):
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        rset = self.req.etype_rset(etype)
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        return [v for v in self._possible_views(self.req, rset)
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                if v.category != 'startupview']
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    def stereotype(self, name):
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        return Span((' <<%s>>' % name,), klass='stereotype')
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    def visit_entityschema(self, eschema, skiptypes=()):
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        """get a layout for an entity schema"""
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        etype = eschema.type
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        layout = Section(children=' ', klass='clear')
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        layout.append(Link(etype,'&#160;' , id=etype)) # anchor
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        title = Link(self.eschema_link_url(eschema), etype)
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        boxchild = [Section(children=(title, ' (%s)'% eschema.display_name(self.req)), klass='title')]
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        table = Table(cols=4, rheaders=1,
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                      children=self._entity_attributes_data(eschema))
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        boxchild.append(Section(children=(table,), klass='body'))
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        data = []
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        data.append(Section(children=boxchild, klass='box'))
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        data.append(Section(children='', klass='vl'))
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        data.append(Section(children='', klass='hl'))
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        t_vars = []
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        rels = []
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        first = True
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        for rschema, targetschemas, x in eschema.relation_definitions():
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 1998
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   121
            if rschema.type in skiptypes:
0
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                continue
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   123
            if not (rschema.has_local_role('read') or rschema.has_perm(self.req, 'read')):
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                continue
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   125
            rschemaurl = self.rschema_link_url(rschema)
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   126
            for oeschema in targetschemas:
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                label = rschema.type
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   128
                if x == 'subject':
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                    cards = rschema.rproperty(eschema, oeschema, 'cardinality')
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   130
                else:
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   131
                    cards = rschema.rproperty(oeschema, eschema, 'cardinality')
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                    cards = cards[::-1]
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                label = '%s %s (%s) %s' % (CARD_MAP[cards[1]], label, display_name(self.req, label, x), CARD_MAP[cards[0]])
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                rlink = Link(rschemaurl, label)
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                elink = Link(self.eschema_link_url(oeschema), oeschema.type)
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   136
                if first:
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   137
                    t_vars.append(Section(children=(elink,), klass='firstvar'))
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   138
                    rels.append(Section(children=(rlink,), klass='firstrel'))
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   139
                    first = False
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   140
                else:
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   141
                    t_vars.append(Section(children=(elink,), klass='var'))
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   142
                    rels.append(Section(children=(rlink,), klass='rel'))
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   143
        data.append(Section(children=rels, klass='rels'))
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   144
        data.append(Section(children=t_vars, klass='vars'))
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   145
        layout.append(Section(children=data, klass='entityAttributes'))
3689
deb13e88e037 follow yams 0.25 api changes to improve performance
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 2996
diff changeset
   146
        if eschema.final: # stop here for final entities
0
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   147
            return layout
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   148
        _ = self.req._
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   149
        if self.req.user.matching_groups('managers'):
1494
d68aac1cda0d #342695: add new security section to the schema view
Katia Saurfelt <katia.saurfelt@logilab.fr>
parents: 0
diff changeset
   150
            # layout.append(self.format_acls(eschema, ('read', 'add', 'delete', 'update')))
0
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   151
            # possible views for this entity type
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            views = [_(view.title) for view in self.possible_views(etype)]
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   153
            layout.append(Section(children=(Table(cols=1, rheaders=1,
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   154
                                                  children=[_('views')]+views),),
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   155
                                  klass='views'))
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   156
        return layout
1731
13f948678a6a delete-trailing-spaces, fix typo
sylvain.thenault@logilab.fr
parents: 1522
diff changeset
   157
0
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   158
    def visit_relationschema(self, rschema, title=True):
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   159
        """get a layout for a relation schema"""
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   160
        _ = self.req._
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   161
        title = Link(self.rschema_link_url(rschema), rschema.type)
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   162
        stereotypes = []
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   163
        if rschema.meta:
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   164
            stereotypes.append('meta')
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   165
        if rschema.symetric:
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   166
            stereotypes.append('symetric')
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   167
        if rschema.inlined:
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   168
            stereotypes.append('inlined')
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   169
        title = Section(children=(title, ' (%s)'%rschema.display_name(self.req)), klass='title')
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   170
        if stereotypes:
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   171
            title.append(self.stereotype(','.join(stereotypes)))
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   172
        layout = Section(children=(title,), klass='schema')
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   173
        data = [_('from'), _('to')]
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   174
        schema = rschema.schema
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   175
        rschema_objects = rschema.objects()
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   176
        if rschema_objects:
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   177
            # might be empty
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   178
            properties = [p for p in rschema.rproperty_defs(rschema_objects[0])
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   179
                          if not p in ('cardinality', 'composite', 'eid')]
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   180
        else:
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   181
            properties = []
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   182
        data += [_(prop) for prop in properties]
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   183
        cols = len(data)
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   184
        done = set()
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   185
        for subjtype, objtypes in rschema.associations():
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   186
            for objtype in objtypes:
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   187
                if (subjtype, objtype) in done:
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   188
                    continue
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   189
                done.add((subjtype, objtype))
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   190
                if rschema.symetric:
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   191
                    done.add((objtype, subjtype))
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   192
                data.append(Link(self.eschema_link_url(schema[subjtype]), subjtype))
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   193
                data.append(Link(self.eschema_link_url(schema[objtype]), objtype))
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   194
                for prop in properties:
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   195
                    val = rschema.rproperty(subjtype, objtype, prop)
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   196
                    if val is None:
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   197
                        val = ''
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   198
                    elif isinstance(val, (list, tuple)):
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   199
                        val = ', '.join(str(v) for v in val)
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   200
                    elif val and isinstance(val, basestring):
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   201
                        val = _(val)
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   202
                    else:
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   203
                        val = str(val)
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   204
                    data.append(Text(val))
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   205
        table = Table(cols=cols, rheaders=1, children=data)
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diff changeset
   206
        layout.append(Section(children=(table,), klass='relationDefinition'))
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diff changeset
   207
        if not self.req.cnx.anonymous_connection:
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diff changeset
   208
            layout.append(self.format_acls(rschema, ('read', 'add', 'delete')))
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diff changeset
   209
        layout.append(Section(children='', klass='clear'))
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diff changeset
   210
        return layout
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diff changeset
   211
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   212
    def to_string(self, value):
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   213
        """used to converte arbitrary values to encoded string"""
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   214
        if isinstance(value, unicode):
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   215
            return value.encode(self.encoding, 'replace')
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diff changeset
   216
        return str(value)