On Nov 16, 12:53 pm, len <[EMAIL PROTECTED]> wrote:
> On Nov 16, 12:40 pm, "Mark Tolonen" <[EMAIL PROTECTED]> wrote:
>
>
> > You might want to check out the pyparsing library.
>
> > -Mark
>
> Thanks Mark I will check in out right now.
>
> Len
Len -
Here is a rough pyparsing starter for your problem:
from pyparsing import *
COMP = Optional("USAGE IS") + oneOf("COMP COMPUTATIONAL")
PIC = oneOf("PIC PICTURE") + Optional("IS")
PERIOD,LPAREN,RPAREN = map(Suppress,".()")
ident = Word(alphanums.upper()+"_-")
integer = Word(nums).setParseAction(lambda t:int(t[0]))
lineNum = Suppress(Optional(LineEnd()) + LineStart() + Word(nums))
rep = LPAREN + integer + RPAREN
repchars = "X" + rep
repchars.setParseAction(lambda tokens: ['X']*tokens[1])
strdecl = Combine(OneOrMore(repchars | "X"))
SIGN = Optional("S")
repdigits = "9" + rep
repdigits.setParseAction(lambda tokens: ['9']*tokens[1])
intdecl = SIGN("sign") + Combine(OneOrMore(repdigits | "9"))
("intpart")
realdecl = SIGN("sign") + Combine(OneOrMore(repdigits | "9"))
("intpart") + "V" + \
Combine(OneOrMore("9" + rep | "9"))("realpart")
type = Group((strdecl | realdecl | intdecl) +
Optional(COMP("COMP")))
fieldDecl = lineNum + "05" + ident("name") + \
PIC + type("type") + PERIOD
structDecl = lineNum + "01" + ident("name") + PERIOD + \
OneOrMore(Group(fieldDecl))("fields")
It prints out:
SALESMEN-RECORD
SALESMEN-NO ['999']
SALESMEN-NAME ['XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX']
SALESMEN-TERRITORY ['XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX']
SALESMEN-QUOTA ['S', '9999999', 'COMP']
SALESMEN-1ST-BONUS ['S', '99999', 'V', '99', 'COMP']
SALESMEN-2ND-BONUS ['S', '99999', 'V', '99', 'COMP']
SALESMEN-3RD-BONUS ['S', '99999', 'V', '99', 'COMP']
SALESMEN-4TH-BONUS ['S', '99999', 'V', '99', 'COMP']
I too have some dim, dark, memories of COBOL. I seem to recall having
to infer from the number of digits in an integer or real what size the
number would be. I don't have that logic implemented, but here is an
extension to the above program, which shows you where you could put
this kind of type inference logic (insert this code before the call to
searchString):
class TypeDefn(object):
@staticmethod
def intType(tokens):
self = TypeDefn()
self.str = "int(%d)" % (len(tokens.intpart),)
self.isSigned = bool(tokens.sign)
return self
@staticmethod
def realType(tokens):
self = TypeDefn()
self.str = "real(%d.%d)" % (len(tokens.intpart),len
(tokens.realpart))
self.isSigned = bool(tokens.sign)
return self
@staticmethod
def charType(tokens):
self = TypeDefn()
self.str = "char(%d)" % len(tokens)
self.isSigned = False
self.isComp = False
return self
def __repr__(self):
return ("+-" if self.isSigned else "") + self.str
intdecl.setParseAction(TypeDefn.intType)
realdecl.setParseAction(TypeDefn.realType)
strdecl.setParseAction(TypeDefn.charType)
This prints:
SALESMEN-RECORD
SALESMEN-NO [int(3)]
SALESMEN-NAME [char(1)]
SALESMEN-TERRITORY [char(1)]
SALESMEN-QUOTA [+-int(7), 'COMP']
SALESMEN-1ST-BONUS [+-real(5.2), 'COMP']
SALESMEN-2ND-BONUS [+-real(5.2), 'COMP']
SALESMEN-3RD-BONUS [+-real(5.2), 'COMP']
SALESMEN-4TH-BONUS [+-real(5.2), 'COMP']
You can post more questions about pyparsing on the Discussion tab of
the pyparsing wiki home page.
Best of luck!
-- Paul
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