Hey,
Thanks for the further explanations. I'm going to play around more
with the 'recursive grammar' and 'parse-time dynamic grammar element'
stuff so that I understand it a bit better.
I liked the changes you suggested. The alternative grammar definitely
makes the code easier to understand, plus the 'delimitedList' function
is very handy. I can see the usefulness of 'Combine' but it's not
needed here.
This didn't work though:
print res["Start"][0].asList()
But that's ok, because I was more than happy to do:
myArray = [res["Start"]][0]
and have the whole thing as a list. Very nice indeed :)
Thanks again for your help!
For anyone thats interested, here is the updated code (my original
code with Paul's enhancements)
#!/usr/bin/python
from pyparsing import Word, OneOrMore, Group, alphas, \
alphanums, Suppress, Dict, delimitedList, ParseResults
import string
def allIn( as, members ):
"Tests that all elements of as are in members"""
for a in as:
if a not in members:
return False
return True
def allUpper( as ):
"""Tests that all strings in as are uppercase"""
return allIn( as, string.uppercase )
# recursive reference fixer-upper
def fixupRefsRecursive(tokens, lookup):
if isinstance(tokens, ParseResults):
subs = [ fixupRefsRecursive(t, lookup) for t in tokens ]
tokens = ParseResults( subs )
else:
if tokens.isupper():
tokens = fixupRefsRecursive(lookup[tokens], lookup)
return tokens
def fixupRefs(tokens):
tokens["Start"] = fixupRefsRecursive( tokens["Start"], tokens )
testData = """
:Start: first SECOND THIRD fourth FIFTH
:SECOND: second1_1 second1_2 | second2 | second3
:THIRD: third1 third2 | SIXTH
:FIFTH: fifth1 | SEVENTH
:SIXTH: sixth1_1 sixth1_2 | sixth2
:SEVENTH: EIGHTH | seventh1
:EIGHTH: eighth1 | eighth2
"""
COLON = Suppress(":")
label = COLON + Word(alphas + "_") + COLON
entry = Word(alphanums + "_")
data = delimitedList( Group(OneOrMore(entry)), delim="|" )
line = Group(label + data)
doc = Dict(OneOrMore(line))
doc.setParseAction( fixupRefs )
res = doc.parseString(testData)
myArray = [res["Start"]][0]
print myArray
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