Here's the pyparsing rendition - about 24 lines of code, and another 30
for testing.
For reference, here's the JSON "bnf":
object
{ members }
{}
members
string : value
members , string : value
array
[ elements ]
[]
elements
value
elements , value
value
string
number
object
array
true
false
null
Download pyparsing at http://pyparsing.sourceforge.net.
-- Paul
from pyparsing import *
TRUE = Keyword("true")
FALSE = Keyword("false")
NULL = Keyword("null")
jsonString = dblQuotedString.setParseAction( removeQuotes )
jsonNumber = Combine( Optional('-') + ( '0' | Word('123456789',nums) )
+
Optional( '.' + Word(nums) ) +
Optional( Word('eE',exact=1) + Word(nums+'+-',nums)
) )
jsonObject = Forward()
jsonValue = Forward()
jsonElements = delimitedList( jsonValue )
jsonArray = Group( Suppress('[') + jsonElements + Suppress(']') )
jsonValue << ( jsonString | jsonNumber | jsonObject | jsonArray | TRUE
| FALSE | NULL )
memberDef = Group( jsonString + Suppress(':') + jsonValue )
jsonMembers = delimitedList( memberDef )
jsonObject << Dict( Suppress('{') + jsonMembers + Suppress('}') )
lineComment = '//' + restOfLine
jsonComment = FollowedBy('/') + ( cStyleComment | lineComment )
jsonObject.ignore( jsonComment )
testdata = """
{
"glossary": {
"title": "example glossary",
"GlossDiv": {
"title": "S",
"GlossList": [{
"ID": "SGML",
"SortAs": "SGML",
"GlossTerm": "Standard Generalized Markup Language",
"Acronym": "SGML",
"Abbrev": "ISO 8879:1986",
"GlossDef":
"A meta-markup language, used to create markup languages such as
DocBook.",
"GlossSeeAlso": ["GML", "XML", "markup"]
}]
}
}
}
"""
results = jsonObject.parseString(testdata)
import pprint
pprint.pprint( results.asList() )
print results.glossary.title
print results.glossary.GlossDiv
print results.glossary.GlossDiv.GlossList.keys()
Prints out (I've inserted blank lines to separate the output from the
different print statements):
[['glossary',
['title', 'example glossary'],
['GlossDiv',
['title', 'S'],
['GlossList',
[['ID', 'SGML'],
['SortAs', 'SGML'],
['GlossTerm', 'Standard Generalized Markup Language'],
['Acronym', 'SGML'],
['Abbrev', 'ISO 8879:1986'],
['GlossDef',
'A meta-markup language, used to create markup languages such as
DocBook.'],
['GlossSeeAlso', ['GML', 'XML', 'markup']]]]]]]
example glossary
[['title', 'S'], ['GlossList', [['ID', 'SGML'], ['SortAs', 'SGML'],
['GlossTerm', 'Standard Generalized Markup Language'], ['Acronym',
'SGML'], ['Abbrev', 'ISO 8879:1986'], ['GlossDef', 'A meta-markup
language, used to create markup languages such as DocBook.'],
['GlossSeeAlso', ['GML', 'XML', 'markup']]]]]
['GlossSeeAlso', 'GlossDef', 'Acronym', 'GlossTerm', 'SortAs',
'Abbrev', 'ID']
--
http://mail.python.org/mailman/listinfo/python-list
