/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_13_patch3/src/PhysicsTools/PatAlgos/python/tools/helpers.py

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import FWCore.ParameterSet.Config as cms

## Helpers to perform some technically boring tasks like looking for all modules with a given parameter
## and replacing that to a given value

def applyPostfix(process, label, postfix):
    ''' If a module is in patDefaultSequence use the cloned module.
    Will crash if patDefaultSequence has not been cloned with 'postfix' beforehand'''
    result = None
    defaultLabels = __labelsInSequence(process, "patDefaultSequence", postfix)
    if hasattr(process, "patPF2PATSequence"):
        defaultLabels = __labelsInSequence(process, "patPF2PATSequence", postfix)
    if label in defaultLabels and hasattr(process, label+postfix):
        result = getattr(process, label+postfix)
    elif hasattr(process, label):
        print "WARNING: called applyPostfix for module/sequence %s which is not in patDefaultSequence%s!"%(label,postfix)
        result = getattr(process, label)
    return result

def removeIfInSequence(process, target,  sequenceLabel, postfix=""):
    labels = __labelsInSequence(process, sequenceLabel, postfix)
    if target+postfix in labels:
        getattr(process, sequenceLabel+postfix).remove(
            getattr(process, target+postfix)
            )

def __labelsInSequence(process, sequenceLabel, postfix=""):
    result = [ m.label()[:-len(postfix)] for m in listModules( getattr(process,sequenceLabel+postfix))]
    result.extend([ m.label()[:-len(postfix)] for m in listSequences( getattr(process,sequenceLabel+postfix))]  )
    if postfix == "":
        result = [ m.label() for m in listModules( getattr(process,sequenceLabel+postfix))]
        result.extend([ m.label() for m in listSequences( getattr(process,sequenceLabel+postfix))]  )
    return result

class MassSearchReplaceParamVisitor(object):
    """Visitor that travels within a cms.Sequence, looks for a parameter and replaces its value"""
    def __init__(self,paramName,paramSearch,paramValue,verbose=False):
        self._paramName   = paramName
        self._paramValue  = paramValue
        self._paramSearch = paramSearch
        self._verbose = verbose
    def enter(self,visitee):
        if (hasattr(visitee,self._paramName)):
            if getattr(visitee,self._paramName) == self._paramSearch:
                if self._verbose:print "Replaced %s.%s: %s => %s" % (visitee,self._paramName,getattr(visitee,self._paramName),self._paramValue)
                setattr(visitee,self._paramName,self._paramValue)
    def leave(self,visitee):
        pass

class MassSearchReplaceAnyInputTagVisitor(object):
    """Visitor that travels within a cms.Sequence, looks for a parameter and replace its value
       It will climb down within PSets, VPSets and VInputTags to find its target"""
    def __init__(self,paramSearch,paramReplace,verbose=False,moduleLabelOnly=False):
        self._paramSearch  = self.standardizeInputTagFmt(paramSearch)
        self._paramReplace = self.standardizeInputTagFmt(paramReplace)
        self._moduleName   = ''
        self._verbose=verbose
        self._moduleLabelOnly=moduleLabelOnly
    def doIt(self,pset,base):
        if isinstance(pset, cms._Parameterizable):
            for name in pset.parameterNames_():
                # if I use pset.parameters_().items() I get copies of the parameter values
                # so I can't modify the nested pset
                value = getattr(pset,name)
                type = value.pythonTypeName()
                if type == 'cms.PSet':
                    self.doIt(value,base+"."+name)
                elif type == 'cms.VPSet':
                    for (i,ps) in enumerate(value): self.doIt(ps, "%s.%s[%d]"%(base,name,i) )
                elif type == 'cms.VInputTag':
                    for (i,n) in enumerate(value):
                         # VInputTag can be declared as a list of strings, so ensure that n is formatted correctly
                         n = self.standardizeInputTagFmt(n)
                         if (n == self._paramSearch):
                            if self._verbose:print "Replace %s.%s[%d] %s ==> %s " % (base, name, i, self._paramSearch, self._paramReplace)
                            value[i] = self._paramReplace
                         elif self._moduleLabelOnly and n.moduleLabel == self._paramSearch.moduleLabel:
                            nrep = n; nrep.moduleLabel = self._paramReplace.moduleLabel
                            if self._verbose:print "Replace %s.%s[%d] %s ==> %s " % (base, name, i, n, nrep)
                            value[i] = nrep
                elif type.endswith('.InputTag'):
                    if value == self._paramSearch:
                        if self._verbose:print "Replace %s.%s %s ==> %s " % (base, name, self._paramSearch, self._paramReplace)
                        from copy import deepcopy
                        if 'untracked' in type:
                            setattr(pset, name, cms.untracked.InputTag(self._paramReplace.getModuleLabel(),
                                                                       self._paramReplace.getProductInstanceLabel(),
                                                                       self._paramReplace.getProcessName()))
                        else:
                            setattr(pset, name, deepcopy(self._paramReplace) )
                    elif self._moduleLabelOnly and value.moduleLabel == self._paramSearch.moduleLabel:
                        from copy import deepcopy
                        repl = deepcopy(getattr(pset, name))
                        repl.moduleLabel = self._paramReplace.moduleLabel
                        setattr(pset, name, repl)
                        if self._verbose:print "Replace %s.%s %s ==> %s " % (base, name, value, repl)


    @staticmethod
    def standardizeInputTagFmt(inputTag):
       ''' helper function to ensure that the InputTag is defined as cms.InputTag(str) and not as a plain str '''
       if not isinstance(inputTag, cms.InputTag):
          return cms.InputTag(inputTag)
       return inputTag

    def enter(self,visitee):
        label = ''
        try:    label = visitee.label_()
        except AttributeError: label = '<Module not in a Process>'
        self.doIt(visitee, label)
    def leave(self,visitee):
        pass

#FIXME name is not generic enough now
class GatherAllModulesVisitor(object):
    """Visitor that travels within a cms.Sequence, and returns a list of objects of type gatheredInance(e.g. modules) that have it"""
    def __init__(self, gatheredInstance=cms._Module):
        self._modules = []
        self._gatheredInstance= gatheredInstance
    def enter(self,visitee):
        if isinstance(visitee,self._gatheredInstance):
            self._modules.append(visitee)
    def leave(self,visitee):
        pass
    def modules(self):
        return self._modules

class CloneSequenceVisitor(object):
    """Visitor that travels within a cms.Sequence, and returns a cloned version of the Sequence.
    All modules and sequences are cloned and a postfix is added"""
    def __init__(self, process, label, postfix):
        self._process = process
        self._postfix = postfix
        self._sequenceStack = [label]
        self._moduleLabels = []
        self._sequenceLabels = []
        self._waitForSequenceToClose = None # modules will only be cloned or added if this is None

    def enter(self,visitee):
        if not self._waitForSequenceToClose is None:
            return #we are in a already cloned sequence
        if isinstance(visitee,cms._Module):
            label = visitee.label()
            newModule = None
            if label in self._moduleLabels:
                newModule = getattr(self._process, label+self._postfix)
            else:
                self._moduleLabels.append(label)

                newModule = visitee.clone()
                setattr(self._process, label+self._postfix, newModule)
            self.__appendToTopSequence(newModule)

        if isinstance(visitee,cms.Sequence):
            if visitee.label() in self._sequenceLabels: # is the sequence allready cloned?
                self._waitForSequenceToClose = visitee.label()
                self._sequenceStack.append(  getattr(self._process, visitee.label()+self._postfix) )
            else:
                self._sequenceStack.append(visitee.label())#save desired label as placeholder until we have a module to create the sequence

    def leave(self,visitee):
        if isinstance(visitee,cms.Sequence):
            if self._waitForSequenceToClose == visitee.label():
                self._waitForSequenceToClose = None
            if not isinstance(self._sequenceStack[-1], cms.Sequence):
                raise StandardError, "empty Sequence encountered during cloneing. sequnece stack: %s"%self._sequenceStack
            self.__appendToTopSequence( self._sequenceStack.pop() )

    def clonedSequence(self):
        if not len(self._sequenceStack) == 1:
            raise StandardError, "someting went wrong, the sequence stack looks like: %s"%self._sequenceStack
        for label in self._moduleLabels:
            massSearchReplaceAnyInputTag(self._sequenceStack[-1], label, label+self._postfix, moduleLabelOnly=True, verbose=False)
        self._moduleLabels = [] #prevent the InputTag replacement next time this is called.
        return self._sequenceStack[-1]

    def __appendToTopSequence(self, visitee):#this is darn ugly because empty cms.Sequences are not supported
        if isinstance(self._sequenceStack[-1], basestring):#we have the name of an empty sequence on the stack. create it!
            oldSequenceLabel = self._sequenceStack.pop()
            newSequenceLabel = oldSequenceLabel + self._postfix
            self._sequenceStack.append(cms.Sequence(visitee))
            if hasattr(self._process, newSequenceLabel):
                raise StandardError("Cloning the sequence "+self._sequenceStack[-1].label()+" would overwrite existing object." )
            setattr(self._process, newSequenceLabel, self._sequenceStack[-1])
            self._sequenceLabels.append(oldSequenceLabel)
        else:
            self._sequenceStack[-1] += visitee

class MassSearchParamVisitor(object):
    """Visitor that travels within a cms.Sequence, looks for a parameter and returns a list of modules that have it"""
    def __init__(self,paramName,paramSearch):
        self._paramName   = paramName
        self._paramSearch = paramSearch
        self._modules = []
    def enter(self,visitee):
        if (hasattr(visitee,self._paramName)):
            if getattr(visitee,self._paramName) == self._paramSearch:
                self._modules.append(visitee)
    def leave(self,visitee):
        pass
    def modules(self):
        return self._modules


def massSearchReplaceParam(sequence,paramName,paramOldValue,paramValue,verbose=False):
    sequence.visit(MassSearchReplaceParamVisitor(paramName,paramOldValue,paramValue,verbose))

def listModules(sequence):
    visitor = GatherAllModulesVisitor(gatheredInstance=cms._Module)
    sequence.visit(visitor)
    return visitor.modules()

def listSequences(sequence):
    visitor = GatherAllModulesVisitor(gatheredInstance=cms.Sequence)
    sequence.visit(visitor)
    return visitor.modules()

def massSearchReplaceAnyInputTag(sequence, oldInputTag, newInputTag,verbose=False,moduleLabelOnly=False) :
    """Replace InputTag oldInputTag with newInputTag, at any level of nesting within PSets, VPSets, VInputTags..."""
    sequence.visit(MassSearchReplaceAnyInputTagVisitor(oldInputTag,newInputTag,verbose=verbose,moduleLabelOnly=moduleLabelOnly))

def jetCollectionString(prefix='', algo='', type=''):
    """
    ------------------------------------------------------------------
    return the string of the jet collection module depending on the
    input vaules. The default return value will be 'patAK5CaloJets'.

    algo   : indicating the algorithm type of the jet [expected are
             'AK5', 'IC5', 'SC7', ...]
    type   : indicating the type of constituents of the jet [expec-
             ted are 'Calo', 'PFlow', 'JPT', ...]
    prefix : prefix indicating the type of pat collection module (ex-
             pected are '', 'selected', 'clean').
    ------------------------------------------------------------------
    """
    if(prefix==''):
        jetCollectionString ='pat'
    else:
        jetCollectionString =prefix
        jetCollectionString+='Pat'
    jetCollectionString+='Jets'
    jetCollectionString+=algo
    jetCollectionString+=type
    return jetCollectionString

def contains(sequence, moduleName):
    """
    ------------------------------------------------------------------
    return True if a module with name 'module' is contained in the
    sequence with name 'sequence' and False otherwise. This version
    is not so nice as it also returns True for any substr of the name
    of a contained module.

    sequence : sequence [e.g. process.patDefaultSequence]
    module   : module name as a string
    ------------------------------------------------------------------
    """
    return not sequence.__str__().find(moduleName)==-1



def cloneProcessingSnippet(process, sequence, postfix):
   """
   ------------------------------------------------------------------
   copy a sequence plus the modules and sequences therein
   both are renamed by getting a postfix
   input tags are automatically adjusted
   ------------------------------------------------------------------
   """
   result = sequence
   if not postfix == "":
       visitor = CloneSequenceVisitor(process,sequence.label(),postfix)
       sequence.visit(visitor)
       result = visitor.clonedSequence()
   return result

if __name__=="__main__":
   import unittest
   class TestModuleCommand(unittest.TestCase):
       def setUp(self):
           """Nothing to do """
           pass
       def testCloning(self):
           p = cms.Process("test")
           p.a = cms.EDProducer("a", src=cms.InputTag("gen"))
           p.b = cms.EDProducer("b", src=cms.InputTag("a"))
           p.c = cms.EDProducer("c", src=cms.InputTag("b","instance"))
           p.s = cms.Sequence(p.a*p.b*p.c *p.a)
           cloneProcessingSnippet(p, p.s, "New")
           self.assertEqual(p.dumpPython(),'import FWCore.ParameterSet.Config as cms\n\nprocess = cms.Process("test")\n\nprocess.a = cms.EDProducer("a",\n    src = cms.InputTag("gen")\n)\n\n\nprocess.c = cms.EDProducer("c",\n    src = cms.InputTag("b","instance")\n)\n\n\nprocess.cNew = cms.EDProducer("c",\n    src = cms.InputTag("bNew","instance")\n)\n\n\nprocess.bNew = cms.EDProducer("b",\n    src = cms.InputTag("aNew")\n)\n\n\nprocess.aNew = cms.EDProducer("a",\n    src = cms.InputTag("gen")\n)\n\n\nprocess.b = cms.EDProducer("b",\n    src = cms.InputTag("a")\n)\n\n\nprocess.s = cms.Sequence(process.a*process.b*process.c*process.a)\n\n\nprocess.sNew = cms.Sequence(process.aNew+process.bNew+process.cNew)\n\n\n')
       def testContains(self):
           p = cms.Process("test")
           p.a = cms.EDProducer("a", src=cms.InputTag("gen"))
           p.b = cms.EDProducer("ab", src=cms.InputTag("a"))
           p.c = cms.EDProducer("ac", src=cms.InputTag("b"))
           p.s1 = cms.Sequence(p.a*p.b*p.c)
           p.s2 = cms.Sequence(p.b*p.c)
           self.assert_( contains(p.s1, "a") )
           self.assert_( not contains(p.s2, "a") )
       def testJetCollectionString(self):
           self.assertEqual(jetCollectionString(algo = 'Foo', type = 'Bar'), 'patFooBarJets')
           self.assertEqual(jetCollectionString(prefix = 'prefix', algo = 'Foo', type = 'Bar'), 'prefixPatFooBarJets')
       def testListModules(self):
           p = cms.Process("test")
           p.a = cms.EDProducer("a", src=cms.InputTag("gen"))
           p.b = cms.EDProducer("ab", src=cms.InputTag("a"))
           p.c = cms.EDProducer("ac", src=cms.InputTag("b"))
           p.s = cms.Sequence(p.a*p.b*p.c)
           self.assertEqual([p.a,p.b,p.c], listModules(p.s))
       def testMassSearchReplaceParam(self):
           p = cms.Process("test")
           p.a = cms.EDProducer("a", src=cms.InputTag("gen"))
           p.b = cms.EDProducer("ab", src=cms.InputTag("a"))
           p.c = cms.EDProducer("ac", src=cms.InputTag("b"),
                                nested = cms.PSet(src = cms.InputTag("c"))
                               )
           p.s = cms.Sequence(p.a*p.b*p.c)
           massSearchReplaceParam(p.s,"src",cms.InputTag("b"),"a")
           self.assertEqual(cms.InputTag("a"),p.c.src)
           self.assertNotEqual(cms.InputTag("a"),p.c.nested.src)
       def testMassSearchReplaceAnyInputTag(self):
           p = cms.Process("test")
           p.a = cms.EDProducer("a", src=cms.InputTag("gen"))
           p.b = cms.EDProducer("ab", src=cms.InputTag("a"))
           p.c = cms.EDProducer("ac", src=cms.InputTag("b"),
                                nested = cms.PSet(src = cms.InputTag("b"), src2 = cms.InputTag("c")),
                                nestedv = cms.VPSet(cms.PSet(src = cms.InputTag("b")), cms.PSet(src = cms.InputTag("d"))),
                                vec = cms.VInputTag(cms.InputTag("a"), cms.InputTag("b"), cms.InputTag("c"), cms.InputTag("d"))
                               )
           p.s = cms.Sequence(p.a*p.b*p.c)
           massSearchReplaceAnyInputTag(p.s, cms.InputTag("b"), cms.InputTag("new"))
           self.assertNotEqual(cms.InputTag("new"), p.b.src)
           self.assertEqual(cms.InputTag("new"), p.c.src)
           self.assertEqual(cms.InputTag("new"), p.c.nested.src)
           self.assertEqual(cms.InputTag("new"), p.c.nested.src)
           self.assertNotEqual(cms.InputTag("new"), p.c.nested.src2)
           self.assertEqual(cms.InputTag("new"), p.c.nestedv[0].src)
           self.assertNotEqual(cms.InputTag("new"), p.c.nestedv[1].src)
           self.assertNotEqual(cms.InputTag("new"), p.c.vec[0])
           self.assertEqual(cms.InputTag("new"), p.c.vec[1])
           self.assertNotEqual(cms.InputTag("new"), p.c.vec[2])
           self.assertNotEqual(cms.InputTag("new"), p.c.vec[3])


   unittest.main()