web/views/workflow.py
author sylvain.thenault@logilab.fr
Tue, 28 Apr 2009 15:37:27 +0200
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"""workflow views:
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* IWorkflowable views and forms
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* workflow entities views (State, Transition, TrInfo)
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:organization: Logilab
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:copyright: 2001-2009 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.mtconverter import html_escape
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from logilab.common.graph import escape, GraphGenerator, DotBackend
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from cubicweb import Unauthorized, view
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from cubicweb.selectors import (implements, has_related_entities,
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                                relation_possible, match_form_params)
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from cubicweb.interfaces import IWorkflowable
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from cubicweb.web import stdmsgs, action, component, form
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from cubicweb.web.form import FormViewMixIn
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from cubicweb.web.formfields import StringField,  RichTextField
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from cubicweb.web.formwidgets import HiddenInput, SubmitButton, Button
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from cubicweb.web.views import TmpFileViewMixin
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from cubicweb.web.views.boxes import EditBox
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_ = unicode
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EditBox.rmode.set_rtag('create', 'destination_state', 'subject', 'Transition')
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EditBox.rmode.set_rtag('create', 'allowed_transition', 'object', 'Transition')
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EditBox.rmode.set_rtag('create', 'destination_state', 'object', 'State')
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EditBox.rmode.set_rtag('create', 'allowed_transition', 'subject', 'State')
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# IWorkflowable views #########################################################
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class ChangeStateForm(form.EntityFieldsForm):
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    id = 'changestate'
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    __method = StringField(name='__method', initial='set_state',
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                           widget=HiddenInput)
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    state = StringField(label=_('state'), eidparam=True, widget=HiddenInput)
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    trcomment = RichTextField(label=_('trcomment'), eidparam=True)
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    form_buttons = [SubmitButton(stdmsgs.YES),
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                     Button(stdmsgs.NO, cwaction='cancel')]
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class ChangeStateFormView(FormViewMixIn, view.EntityView):
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    id = 'statuschange'
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    title = _('status change')
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    __select__ = implements(IWorkflowable) & match_form_params('treid')
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    def cell_call(self, row, col):
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        entity = self.entity(row, col)
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        state = entity.in_state[0]
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        transition = self.req.eid_rset(self.req.form['treid']).get_entity(0, 0)
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        dest = transition.destination()
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        _ = self.req._
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        form = self.vreg.select_object('forms', 'changestate', self.req,
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                                       self.rset, row=row, col=col,
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                                       entity=entity,
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                                       redirect_path=self.redirectpath(entity))
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        self.w(form.error_message())
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        self.w(u'<h4>%s %s</h4>\n' % (_(transition.name),
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                                      entity.view('oneline')))
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        msg = _('status will change from %(st1)s to %(st2)s') % {
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            'st1': _(state.name),
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            'st2': _(dest.name)}
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        self.w(u'<p>%s</p>\n' % msg)
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        self.w(form.form_render(state=dest.eid, trcomment=u''))
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    def redirectpath(self, entity):
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        return entity.rest_path()
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class WFHistoryVComponent(component.EntityVComponent):
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    """display the workflow history for entities supporting it"""
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    id = 'wfhistory'
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    __select__ = (component.EntityVComponent.__select__
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                  & relation_possible('wf_info_for', role='object'))
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    context = 'navcontentbottom'
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    title = _('Workflow history')
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    def cell_call(self, row, col, view=None):
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        _ = self.req._
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        eid = self.rset[row][col]
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        sel = 'Any FS,TS,WF,D'
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        rql = ' ORDERBY D DESC WHERE WF wf_info_for X,'\
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              'WF from_state FS, WF to_state TS, WF comment C,'\
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              'WF creation_date D'
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        if self.vreg.schema.eschema('CWUser').has_perm(self.req, 'read'):
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            sel += ',U,C'
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            rql += ', WF owned_by U?'
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            displaycols = range(5)
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            headers = (_('from_state'), _('to_state'), _('comment'), _('date'),
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                       _('CWUser'))
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        else:
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            sel += ',C'
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            displaycols = range(4)
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            headers = (_('from_state'), _('to_state'), _('comment'), _('date'))
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        rql = '%s %s, X eid %%(x)s' % (sel, rql)
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        try:
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            rset = self.req.execute(rql, {'x': eid}, 'x')
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        except Unauthorized:
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            return
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        if rset:
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            self.wview('table', rset, title=_(self.title), displayactions=False,
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                       displaycols=displaycols, headers=headers)
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# workflow entity types views #################################################
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class CellView(view.EntityView):
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    id = 'cell'
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    __select__ = implements('TrInfo')
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    def cell_call(self, row, col, cellvid=None):
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        self.w(self.entity(row, col).printable_value('comment'))
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class StateInContextView(view.EntityView):
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    """convenience trick, State's incontext view should not be clickable"""
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    id = 'incontext'
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    __select__ = implements('State')
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    def cell_call(self, row, col):
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        self.w(html_escape(self.view('textincontext', self.rset,
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                                     row=row, col=col)))
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# workflow images #############################################################
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class ViewWorkflowAction(action.Action):
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    id = 'workflow'
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    __select__ = implements('CWEType') & has_related_entities('state_of', 'object')
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    category = 'mainactions'
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    title = _('view workflow')
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    def url(self):
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        entity = self.rset.get_entity(self.row or 0, self.col or 0)
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        return entity.absolute_url(vid='workflow')
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class CWETypeWorkflowView(view.EntityView):
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    id = 'workflow'
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    __select__ = implements('CWEType')
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    cache_max_age = 60*60*2 # stay in http cache for 2 hours by default
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    def cell_call(self, row, col, **kwargs):
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        entity = self.entity(row, col)
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        self.w(u'<h1>%s</h1>' % (self.req._('workflow for %s')
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                                 % display_name(self.req, entity.name)))
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        self.w(u'<img src="%s" alt="%s"/>' % (
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            html_escape(entity.absolute_url(vid='ewfgraph')),
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            html_escape(self.req._('graphical workflow for %s') % entity.name)))
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class WorkflowDotPropsHandler(object):
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    def __init__(self, req):
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        self._ = req._
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    def node_properties(self, stateortransition):
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        """return default DOT drawing options for a state or transition"""
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        props = {'label': stateortransition.name,
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                 'fontname': 'Courier'}
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        if hasattr(stateortransition, 'state_of'):
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            props['shape'] = 'box'
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            props['style'] = 'filled'
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            if stateortransition.reverse_initial_state:
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                props['color'] = '#88CC88'
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        else:
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            props['shape'] = 'ellipse'
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            descr = []
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            tr = stateortransition
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            if tr.require_group:
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                descr.append('%s %s'% (
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                    self._('groups:'),
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                    ','.join(g.name for g in tr.require_group)))
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            if tr.condition:
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                descr.append('%s %s'% (self._('condition:'), tr.condition))
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            if descr:
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                props['label'] += escape('\n'.join(descr))
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        return props
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    def edge_properties(self, transition, fromstate, tostate):
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        return {'label': '', 'dir': 'forward',
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                'color': 'black', 'style': 'filled'}
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class WorkflowVisitor:
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    def __init__(self, entity):
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        self.entity = entity
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    def nodes(self):
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        for state in self.entity.reverse_state_of:
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            state.complete()
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            yield state.eid, state
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        for transition in self.entity.reverse_transition_of:
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            transition.complete()
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            yield transition.eid, transition
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    def edges(self):
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        for transition in self.entity.reverse_transition_of:
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            for incomingstate in transition.reverse_allowed_transition:
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                yield incomingstate.eid, transition.eid, transition
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            yield transition.eid, transition.destination().eid, transition
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class CWETypeWorkflowImageView(TmpFileViewMixin, view.EntityView):
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    id = 'ewfgraph'
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    content_type = 'image/png'
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    __select__ = implements('CWEType')
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    def _generate(self, tmpfile):
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        """display schema information for an entity"""
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        entity = self.entity(self.row, self.col)
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        visitor = WorkflowVisitor(entity)
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        prophdlr = WorkflowDotPropsHandler(self.req)
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        generator = GraphGenerator(DotBackend('workflow', 'LR',
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                                              ratio='compress', size='30,12'))
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        return generator.generate(visitor, prophdlr, tmpfile)
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