schemaviewer.py
author sylvain.thenault@logilab.fr
Thu, 30 Apr 2009 00:39:09 +0200
branchtls-sprint
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use xml_escape
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"""an helper class to display CubicWeb schema using ureports
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:organization: Logilab
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:copyright: 2001-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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"""
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__docformat__ = "restructuredtext en"
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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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_ = unicode
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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.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,
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                     skiprels=(), skipmeta=True):
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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.is_final()]
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        if skipmeta:
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            eschemas = [eschema for eschema in eschemas
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                        if not eschema.meta]
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        for eschema in sorted(eschema):
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            esection.append(self.visit_entityschema(eschema, skiprels))
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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.is_final() or rschema.type in skiprels)]
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            if skipmeta:
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                relations = [rschema for rschema in relations
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                             if not rschema.meta]
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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('eetype/%s?vid=eschema' % eschema)
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    def rschema_link_url(self, rschema):
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        return self.req.build_url('ertype/%s?vid=eschema' % 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, skiprels=()):
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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,'&nbsp;' , id=etype)) # anchor
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        title = Link(self.eschema_link_url(eschema), etype)
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        if eschema.meta:
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            stereotype = self.stereotype('meta')
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            boxchild = [Section(children=(title, ' (%s)'%eschema.display_name(self.req), stereotype), klass='title')]
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        else:
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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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            if rschema.type in skiprels:
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                continue
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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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            rschemaurl = self.rschema_link_url(rschema)
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            for oeschema in targetschemas:
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                label = rschema.type
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                if x == 'subject':
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                    cards = rschema.rproperty(eschema, oeschema, 'cardinality')
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                else:
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                    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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                if first:
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                    t_vars.append(Section(children=(elink,), klass='firstvar'))
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                    rels.append(Section(children=(rlink,), klass='firstrel'))
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                    first = False
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                else:
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                    t_vars.append(Section(children=(elink,), klass='var'))
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                    rels.append(Section(children=(rlink,), klass='rel'))
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        data.append(Section(children=rels, klass='rels'))
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        data.append(Section(children=t_vars, klass='vars'))
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        layout.append(Section(children=data, klass='entityAttributes'))
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        if eschema.is_final(): # stop here for final entities
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            return layout
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        _ = self.req._
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        if self.req.user.matching_groups('managers'):
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            # layout.append(self.format_acls(eschema, ('read', 'add', 'delete', 'update')))
0
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            # possible views for this entity type
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            views = [_(view.title) for view in self.possible_views(etype)]
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            layout.append(Section(children=(Table(cols=1, rheaders=1,
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                                                  children=[_('views')]+views),),
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                                  klass='views'))
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        return layout
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    def visit_relationschema(self, rschema, title=True):
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        """get a layout for a relation schema"""
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        _ = self.req._
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        title = Link(self.rschema_link_url(rschema), rschema.type)
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        stereotypes = []
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        if rschema.meta:
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            stereotypes.append('meta')
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        if rschema.symetric:
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            stereotypes.append('symetric')
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        if rschema.inlined:
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            stereotypes.append('inlined')
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        title = Section(children=(title, ' (%s)'%rschema.display_name(self.req)), klass='title')
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        if stereotypes:
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            title.append(self.stereotype(','.join(stereotypes)))
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        layout = Section(children=(title,), klass='schema')
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        data = [_('from'), _('to')]
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        schema = rschema.schema
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        rschema_objects = rschema.objects()
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        if rschema_objects:
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            # might be empty
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            properties = [p for p in rschema.rproperty_defs(rschema_objects[0])
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                          if not p in ('cardinality', 'composite', 'eid')]
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        else:
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            properties = []
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        data += [_(prop) for prop in properties]
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        cols = len(data)
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   194
        done = set()
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        for subjtype, objtypes in rschema.associations():
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            for objtype in objtypes:
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                if (subjtype, objtype) in done:
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                    continue
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                done.add((subjtype, objtype))
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   200
                if rschema.symetric:
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                    done.add((objtype, subjtype))
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                data.append(Link(self.eschema_link_url(schema[subjtype]), subjtype))
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                data.append(Link(self.eschema_link_url(schema[objtype]), objtype))
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                for prop in properties:
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                    val = rschema.rproperty(subjtype, objtype, prop)
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   206
                    if val is None:
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                        val = ''
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   208
                    elif isinstance(val, (list, tuple)):
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   209
                        val = ', '.join(str(v) for v in val)
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   210
                    elif val and isinstance(val, basestring):
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   211
                        val = _(val)
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diff changeset
   212
                    else:
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   213
                        val = str(val)
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   214
                    data.append(Text(val))
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   215
        table = Table(cols=cols, rheaders=1, children=data)
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   216
        layout.append(Section(children=(table,), klass='relationDefinition'))
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   217
        if not self.req.cnx.anonymous_connection:
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   218
            layout.append(self.format_acls(rschema, ('read', 'add', 'delete')))
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   219
        layout.append(Section(children='', klass='clear'))
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   220
        return layout
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   221
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   222
    def to_string(self, value):
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   223
        """used to converte arbitrary values to encoded string"""
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   224
        if isinstance(value, unicode):
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   225
            return value.encode(self.encoding, 'replace')
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   226
        return str(value)