Steve -
>>I have to differentiate between:
>> (NP -x-y)
>>and:
>> (NP-x -y)
>>I'm doing this now using Combine. Does that seem right?
If your word char set is just alphanums+"-", then this will work
without doing anything unnatural with leaveWhitespace:
from pyparsing import *
thing = Word(alphanums+"-")
LPAREN = Literal("(").suppress()
RPAREN = Literal(")").suppress()
node = LPAREN + OneOrMore(thing) + RPAREN
print node.parseString("(NP -x-y)")
print node.parseString("(NP-x -y)")
will print:
['NP', '-x-y']
['NP-x', '-y']
Your examples helped me to see what my operator precedence concern was.
Fortunately, your usage was an And, composed using '+' operators. If
your construct was a MatchFirst, composed using '|' operators, things
aren't so pretty:
print 2 << 1 | 3
print 2 << (1 | 3)
7
16
So I've just gotten into the habit of parenthesizing anything I load
into a Forward using '<<'.
-- Paul
--
http://mail.python.org/mailman/listinfo/python-list
