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##############################################################################
# Name: json.py
# Purpose: Implementation of a simple JSON parser in arpeggio.
# Author: Igor R. Dejanovic <igor DOT dejanovic AT gmail DOT com>
# Copyright: (c) 2009-2014 Igor R. Dejanovic <igor DOT dejanovic AT gmail DOT com>
# License: MIT License
#
# This example is based on jsonParser.py from the pyparsing project
# (see http://pyparsing.wikispaces.com/).
##############################################################################
from __future__ import unicode_literals
import os
from arpeggio import *
from arpeggio import RegExMatch as _
def TRUE(): return "true"
def FALSE(): return "false"
def NULL(): return "null"
def jsonString(): return '"', _(r'[^"]*'),'"'
def jsonNumber(): return _(r'-?\d+((\.\d*)?((e|E)(\+|-)?\d+)?)?')
def jsonValue(): return [jsonString, jsonNumber, jsonObject, jsonArray, TRUE, FALSE, NULL]
def jsonArray(): return "[", Optional(jsonElements), "]"
def jsonElements(): return jsonValue, ZeroOrMore(",", jsonValue)
def memberDef(): return jsonString, ":", jsonValue
def jsonMembers(): return memberDef, ZeroOrMore(",", memberDef)
def jsonObject(): return "{", Optional(jsonMembers), "}"
def jsonFile(): return jsonObject, EOF
def main(debug=False):
# Creating parser from parser model.
parser = ParserPython(jsonFile, debug=debug)
# Load test JSON file
current_dir = os.path.dirname(__file__)
testdata = open(os.path.join(current_dir, 'test.json')).read()
# Parse json string
parse_tree = parser.parse(testdata)
# parse_tree can now be analysed and transformed to some other form
# using e.g. visitor support. See http://textx.github.io/Arpeggio/semantics/
if __name__ == "__main__":
# In debug mode dot (graphviz) files for parser model
# and parse tree will be created for visualization.
# Checkout current folder for .dot files.
main(debug=True)
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