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listdict.py
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listdict.py
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from collections import OrderedDict
import pyparsing as pp
# Minimal BNF. See below for a more comprehensive BNF
bnf = """
listdict
[ keyvaluepairs ]
'listdict()'
keyvaluepairs
keyvaluepair
keyvaluepairs , keyvaluepair
keyvaluepair
key : value
"""
key = pp.quotedString()
colon = pp.Literal(':').suppress()
value = pp.quotedString()
keyvaluepair = pp.Group(key + colon + value)
keyvaluepairs = pp.delimitedList(keyvaluepair, ',')
lsquare = pp.Literal('[').suppress()
rsquare = pp.Literal(']').suppress()
empty = pp.Literal('listdict()').suppress()
parser = (lsquare + keyvaluepairs + rsquare | empty)
class listdict(OrderedDict):
"""
listdict is a Pythonic way of representing an OrderedDict.
What dict is to set, so listdict is to list; ordered, and denoted with
colon-separated key-value pairs like dict, and wrapped in square brackets like
list.
>>> ordered_dict = loads("['eggs': 'spam', 'ham': 'spam']")
>>> ld = listdict(ordered_dict)
>>> repr(ld)
"['eggs': 'spam', 'ham': 'spam']"
"""
def __repr__(self):
return dumps(self)
def loads(listdictrepr):
"""
Converts "['eggs': 'spam']" to OrderedDict([('eggs': 'spam')])
>>> loads("['eggs': 'spam', 'ham': 'spam']")
OrderedDict([('eggs', 'spam'), ('ham', 'spam')])
>>> loads('listdict()')
OrderedDict()
"""
data = parser.parseString(listdictrepr)
if data:
evil = ((eval(k), eval(v)) for k, v in data)
return OrderedDict(evil)
else:
return OrderedDict()
def dumps(ordered_dict):
"""
Converts OrderedDict([('eggs', 'spam')]) to "['eggs': 'spam']"
>>> ordered_dict = OrderedDict([('eggs', 'spam'), ('ham', 'spam')])
>>> dumps(ordered_dict)
"['eggs': 'spam', 'ham': 'spam']"
>>> dumps(OrderedDict([]))
'listdict()'
"""
if not ordered_dict:
return 'listdict()'
pairs = [': '.join((repr(k), repr(v))) for k, v in ordered_dict.items()]
return '[' + ', '.join(pairs) + ']'
# bnf = """
# listdict
# [ keyvaluepairs ]
# 'listdict()'
#
# keyvaluepairs
# key : value
# keyvaluepairs , key : value
#
# key
# bool
# bytestring
# float
# integer
# keytuple
# none
# unicode
#
# value
# bool
# bytestring
# dict
# float
# integer
# list
# listdict
# none
# set
# string
# valuetuple
# unicode
#
# keytuple
# ( tuplekeys )
# ()
#
# tuplekeys
# key ,
# key , keys
#
# keys
# key
# key , keys
#
# dict
# { keyvaluepairs }
# {}
#
# list
# [ values ]
# []
#
# values
# value
# value , values
#
# set
# { values }
# 'set()'
#
# valuetuple
# ( tuplevalues )
# ()
#
# tuplevalues
# value ,
# value , values
#
# """