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#
# configparse.py
#
# an example of using the parsing module to be able to process a .INI configuration file
#
# Copyright (c) 2003, Paul McGuire
#

from pyparsing import \
        Literal, Word, ZeroOrMore, Group, Dict, Optional, \
        printables, ParseException, restOfLine
import pprint


inibnf = None
def inifile_BNF():
    global inibnf
    
    if not inibnf:

        # punctuation
        lbrack = Literal("[").suppress()
        rbrack = Literal("]").suppress()
        equals = Literal("=").suppress()
        semi   = Literal(";")
        
        comment = semi + Optional( restOfLine )
        
        nonrbrack = "".join( [ c for c in printables if c != "]" ] ) + " \t"
        nonequals = "".join( [ c for c in printables if c != "=" ] ) + " \t"
        
        sectionDef = lbrack + Word( nonrbrack ) + rbrack
        keyDef = ~lbrack + Word( nonequals ) + equals + restOfLine
        
        # using Dict will allow retrieval of named data fields as attributes of the parsed results
        inibnf = Dict( ZeroOrMore( Group( sectionDef + Dict( ZeroOrMore( Group( keyDef ) ) ) ) ) )
        
        inibnf.ignore( comment )
        
    return inibnf


pp = pprint.PrettyPrinter(2)

def test( strng ):
    print strng
    try:
        iniFile = file(strng)
        iniData = "".join( iniFile.readlines() )
        bnf = inifile_BNF()
        tokens = bnf.parseString( iniData )
        pp.pprint( tokens.asList() )

    except ParseException, err:
        print err.line
        print " "*(err.column-1) + "^"
        print err
    
    iniFile.close()
    print
    return tokens
    

ini = test("setup.ini")
print "ini['Startup']['modemid'] =", ini['Startup']['modemid'] 
print "ini.Startup =", ini.Startup
print "ini.Startup.modemid =", ini.Startup.modemid