Pyparsing: grammar for a dictionary list (erlang)

Question

I am trying to build a grammar to parse a list of Erlang anchored tags and map this to Dict in pyparsing. I have problems when I have a list of Dictations. Grammar works if Dict has only one element, but when I add a second, now I can’t figure it out, to make it figure it out.

Current (simplified grammar code (in this case, I deleted bits of the language):

#!/usr/bin/env python2.7

from pyparsing import *

# Erlang config file definition:
erlangAtom = Word( alphas + '_')
erlangString = dblQuotedString.setParseAction( removeQuotes )

erlangValue = Forward()
erlangList = Forward()

erlangElements = delimitedList( erlangValue )
erlangCSList = Suppress('[') + erlangElements + Suppress(']')
erlangList <<= Group( erlangCSList )
erlangTaggedTuple = Group( Suppress('{') + erlangAtom + Suppress(',') +
                           erlangValue + Suppress('}') )
erlangDict = Dict( Suppress('[') + delimitedList( erlangTaggedTuple ) + 
                   Suppress(']') )

erlangValue <<= ( erlangAtom | erlangString |
                  erlangTaggedTuple |
                  erlangDict | erlangList )

if __name__ == "__main__":
    working = """
[{foo,"bar"}, {baz, "bar2"}]
"""

    broken = """
[
    [{foo,"bar"}, {baz, "bar2"}],
    [{foo,"bob"}, {baz, "fez"}]
]
"""
    w = erlangValue.parseString(working)
    print w.dump()

    b = erlangValue.parseString(broken)
    print "b[0]:", b[0].dump()
    print "b[1]:", b[1].dump()

This gives:

[['foo', 'bar'], ['baz', 'bar2']]
- baz: bar2
- foo: bar

b[0]: [['foo', 'bar'], ['baz', 'bar2'], ['foo', 'bob'], ['baz', 'fez']]
- baz: fez
- foo: bob

b[1]:
Traceback (most recent call last):
  File "./erl_testcase.py", line 39, in <module>
    print "b[1]:", b[1].dump()
  File "/Library/Python/2.7/site-packages/pyparsing.py", line 317, in __getitem__
    return self.__toklist[i]
IndexError: list index out of range

i.e. workingworks, but brokennot parsed as two lists.

Any ideas?

Edit: The modified test file will be more explicit with respect to the expected result.

Answer 1

, pyparsing , , . :

, . , , - . , . :

{a, "b" }:

erlangTaggedTuple = Dict(Group(Suppress('{') + erlangAtom + Suppress(',') + erlangValue + Suppress('}') ))

[{a, "b" }, {c, "d" }]:

erlangDict = Suppress('[') + delimitedList( erlangTaggedTuple ) + Suppress(']')

:

erlangList <<= Suppress('[') + delimitedList( Group(erlangDict|erlangList) ) + Suppress(']')

, :

#!/usr/bin/env python2.7

from pyparsing import *

# Erlang config file definition:
erlangAtom = Word( alphas + '_')
erlangString = dblQuotedString.setParseAction( removeQuotes )

erlangValue = Forward()
erlangList = Forward()

erlangTaggedTuple = Dict(Group(Suppress('{') + erlangAtom + Suppress(',') +
                           erlangValue + Suppress('}') ))
erlangDict = Suppress('[') + delimitedList( erlangTaggedTuple ) + Suppress(']') 
erlangList <<= Suppress('[') + delimitedList( Group(erlangDict|erlangList) ) + Suppress(']')

erlangValue <<= ( erlangAtom | erlangString |
                  erlangTaggedTuple |
                  erlangDict| erlangList )

if __name__ == "__main__":
    working = """
[{foo,"bar"}, {baz, "bar2"}]
"""

    broken = """
[
    [{foo,"bar"}, {baz, "bar2"}],
    [{foo,"bob"}, {baz, "fez"}]
]
"""
    w = erlangValue.parseString(working)
    print w.dump()

    b = erlangValue.parseString(broken)
    print "b[0]:", b[0].dump()
    print "b[1]:", b[1].dump()

:

[['foo', 'bar'], ['baz', 'bar2']]
- baz: bar2
- foo: bar
b[0]: [['foo', 'bar'], ['baz', 'bar2']]
- baz: bar2
- foo: bar
b[1]: [['foo', 'bob'], ['baz', 'fez']]
- baz: fez
- foo: bob

, , !

Answer 2

, , JSON, .

, ,

erlangElements = delimitedList( erlangValue )

, erlangValue - , cons'd.

erlangElements = delimitedList( Group(erlangValue) )

, .