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# jsonParser.py
#
# Implementation of a simple JSON parser, returning a hierarchical
# ParseResults object support both list- and dict-style data access.
#
# Copyright 2006, by Paul McGuire
#
# Updated 8 Jan 2007 - fixed dict grouping bug, and made elements and
# members optional in array and object collections
#
# Updated 9 Aug 2016 - use more current pyparsing constructs/idioms
#
json_bnf = """
object
{ members }
{}
members
string : value
members , string : value
array
[ elements ]
[]
elements
value
elements , value
value
string
number
object
array
true
false
null
"""
import pyparsing as pp
from pyparsing import pyparsing_common as ppc
def make_keyword(kwd_str, kwd_value):
return pp.Keyword(kwd_str).setParseAction(pp.replaceWith(kwd_value))
# set to False to return ParseResults
RETURN_PYTHON_COLLECTIONS = True
TRUE = make_keyword("true", True)
FALSE = make_keyword("false", False)
NULL = make_keyword("null", None)
LBRACK, RBRACK, LBRACE, RBRACE, COLON = map(pp.Suppress, "[]{}:")
jsonString = pp.dblQuotedString().setParseAction(pp.removeQuotes)
jsonNumber = ppc.number().setName("jsonNumber")
jsonObject = pp.Forward().setName("jsonObject")
jsonValue = pp.Forward().setName("jsonValue")
jsonElements = pp.delimitedList(jsonValue).setName(None)
# jsonArray = pp.Group(LBRACK + pp.Optional(jsonElements, []) + RBRACK)
# jsonValue << (
# jsonString | jsonNumber | pp.Group(jsonObject) | jsonArray | TRUE | FALSE | NULL
# )
# memberDef = pp.Group(jsonString + COLON + jsonValue).setName("jsonMember")
jsonArray = pp.Group(
LBRACK + pp.Optional(jsonElements) + RBRACK, aslist=RETURN_PYTHON_COLLECTIONS
).setName("jsonArray")
jsonValue << (jsonString | jsonNumber | jsonObject | jsonArray | TRUE | FALSE | NULL)
memberDef = pp.Group(
jsonString + COLON + jsonValue, aslist=RETURN_PYTHON_COLLECTIONS
).setName("jsonMember")
jsonMembers = pp.delimitedList(memberDef).setName(None)
# jsonObject << pp.Dict(LBRACE + pp.Optional(jsonMembers) + RBRACE)
jsonObject << pp.Dict(
LBRACE + pp.Optional(jsonMembers) + RBRACE, asdict=RETURN_PYTHON_COLLECTIONS
)
jsonComment = pp.cppStyleComment
jsonObject.ignore(jsonComment)
if __name__ == "__main__":
testdata = """
{
"glossary": {
"title": "example glossary",
"GlossDiv": {
"title": "S",
"GlossList": [
{
"ID": "SGML",
"SortAs": "SGML",
"GlossTerm": "Standard Generalized Markup Language",
"TrueValue": true,
"FalseValue": false,
"Gravity": -9.8,
"LargestPrimeLessThan100": 97,
"AvogadroNumber": 6.02E23,
"EvenPrimesGreaterThan2": null,
"PrimesLessThan10" : [2,3,5,7],
"Acronym": "SGML",
"Abbrev": "ISO 8879:1986",
"GlossDef": "A meta-markup language, used to create markup languages such as DocBook.",
"GlossSeeAlso": ["GML", "XML", "markup"],
"EmptyDict" : {},
"EmptyList" : []
}
]
}
}
}
"""
results = jsonObject.parseString(testdata)
results.pprint()
if RETURN_PYTHON_COLLECTIONS:
from pprint import pprint
pprint(results)
else:
results.pprint()
print()
def testPrint(x):
print(type(x), repr(x))
if RETURN_PYTHON_COLLECTIONS:
results = results[0]
print(list(results["glossary"]["GlossDiv"]["GlossList"][0].keys()))
testPrint(results["glossary"]["title"])
testPrint(results["glossary"]["GlossDiv"]["GlossList"][0]["ID"])
testPrint(results["glossary"]["GlossDiv"]["GlossList"][0]["FalseValue"])
testPrint(results["glossary"]["GlossDiv"]["GlossList"][0]["Acronym"])
testPrint(
results["glossary"]["GlossDiv"]["GlossList"][0]["EvenPrimesGreaterThan2"]
)
testPrint(results["glossary"]["GlossDiv"]["GlossList"][0]["PrimesLessThan10"])
else:
print(list(results.glossary.GlossDiv.GlossList.keys()))
testPrint(results.glossary.title)
testPrint(results.glossary.GlossDiv.GlossList.ID)
testPrint(results.glossary.GlossDiv.GlossList.FalseValue)
testPrint(results.glossary.GlossDiv.GlossList.Acronym)
testPrint(results.glossary.GlossDiv.GlossList.EvenPrimesGreaterThan2)
testPrint(results.glossary.GlossDiv.GlossList.PrimesLessThan10)
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