[Pyparsing] Not sure why I'm not getting the correct tokens

[Kevin <kcc...@gl...>]

Hi all:

Been working with pyparsing for a few days now and need some help with 
the following

I have a file which is read on startup to either create or create and 
populate classes

The following would be a valid input file

Class1::Instance1
Class1::Instance2
Class1::Instance3 {
     variable1 = TRUE
     variable2 = FALSE
     variable3 = { {"valuename1", 10},
                   {"valuename2", 20} }
     variable4 = { {10, "valuename3"} }
     variable5 = "variable5value" }
Class1::Instance4
Class2::Instance1

etc, etc.

My parser looks as follows

def importFile_BNF():
     global importBNF

#    if importBNF:                # We've been here before. Don't do it again
#        return importBNF


     # Literals not to be stored
     LCB, RCB, COMMA, DQT = map(Suppress, '{},"')
     DCLN = Suppress(Literal('::'))
     comment = Suppress(Literal('#') + Optional(restOfLine))
     assign = Suppress(Literal('='))
     insert = Suppress(Literal('+='))
     remove = Suppress(Literal ('-='))
     operation = assign ^ insert ^ remove

     classIdentifier = Word(alphas , alphanums + '_')
     instanceIdentifier = Word(alphas, alphanums + '_-')
     name = DQT + instanceIdentifier + DQT
     order = Word(nums)
     driverEntry = LCB + name + order + RCB
     valueList = LCB + OneOrMore(driverEntry) + Optional(COMMA) + RCB
     statement = instanceIdentifier + assign + valueList

     identifier = Group(classIdentifier + DCLN + instanceIdentifier)
     stanzaBody = LCB + OneOrMore(statement) + RCB
     stanza = identifier + Optional(stanzaBody)
     stanza.setDebug()

     importBNF = ZeroOrMore(stanza)
     importBNF.setDefaultWhitespaceChars(' \t\r')
     importBNF.ignore(comment)
     importBNF.ignore(blankline)


     return importBNF

What happens when I run this is that when I reach the LCB on Class1::Instance3 I get an exception
that says "Expected W:(abcd.....) (at char XXX), (line:YY, col ZZ)

Having the stanza body marked optional should allow the opening LCB to be parsed, but it appears
that the parser is insisting that I only do 'definitions' and will not allow me to populate the class.

Any help is greatly appreciated.

Kevin