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Specific # attributions are listed in the accompanying credits file. # ############################################################################## ''' Expressions in a web-configurable workflow. $Id: Expression.py,v 1.7 2001/09/18 19:38:28 jens Exp $ ''' __version__='$Revision: 1.7 $'[11:-2] import Globals from Globals import Persistent from Acquisition import aq_inner, aq_parent from AccessControl import getSecurityManager, ClassSecurityInfo from DateTime import DateTime from Products.CMFCore.WorkflowCore import ObjectDeleted, ObjectMoved from Products.PageTemplates.Expressions import getEngine from Products.PageTemplates.TALES import SafeMapping from Products.PageTemplates.PageTemplate import ModuleImporter class Expression (Persistent): text = '' _v_compiled = None security = ClassSecurityInfo() def __init__(self, text): self.text = text self._v_compiled = getEngine().compile(text) def __call__(self, econtext): compiled = self._v_compiled if compiled is None: compiled = self._v_compiled = getEngine().compile(self.text) # ?? Maybe expressions should manipulate the security # context stack. res = compiled(econtext) if isinstance(res, Exception): raise res #print 'returning %s from %s' % (`res`, self.text) return res Globals.InitializeClass(Expression) class StateChangeInfo: ''' Provides information for expressions and scripts. ''' _date = None ObjectDeleted = ObjectDeleted ObjectMoved = ObjectMoved security = ClassSecurityInfo() security.setDefaultAccess('allow') def __init__(self, object, workflow, status=None, transition=None, old_state=None, new_state=None, kwargs=None): if kwargs is None: kwargs = {} else: # Don't allow mutation kwargs = SafeMapping(kwargs) if status is None: tool = aq_parent(aq_inner(workflow)) status = tool.getStatusOf(workflow.id, object) if status is None: status = {} if status: # Don't allow mutation status = SafeMapping(status) self.object = object self.workflow = workflow self.old_state = old_state self.new_state = new_state self.transition = transition self.status = status self.kwargs = kwargs def __getitem__(self, name): if name[:1] != '_' and hasattr(self, name): return getattr(self, name) raise KeyError, name def getHistory(self): wf = self.workflow tool = aq_parent(aq_inner(wf)) wf_id = wf.id h = tool.getHistoryOf(wf_id, self.object) if h: return map(lambda dict: dict.copy(), h) # Don't allow mutation else: return () def getPortal(self): ob = self.object while ob is not None and not getattr(ob, '_isPortalRoot', 0): ob = aq_parent(aq_inner(ob)) return ob def getDateTime(self): date = self._date if not date: date = self._date = DateTime() return date Globals.InitializeClass(StateChangeInfo) def createExprContext(sci): ''' An expression context provides names for TALES expressions. ''' ob = sci.object wf = sci.workflow data = { 'here': ob, 'container': aq_parent(aq_inner(ob)), 'nothing': None, 'root': wf.getPhysicalRoot(), 'request': getattr( ob, 'REQUEST', None ), 'modules': ModuleImporter, 'user': getSecurityManager().getUser(), 'state_change': sci, 'transition': sci.transition, 'status': sci.status, 'kwargs': sci.kwargs, 'workflow': wf, 'scripts': wf.scripts, } return getEngine().getContext(data)