#!/usr/bin/env python

import cgitb
cgitb.enable()

import re

print "Content-Type: text/plain"
print 
print '@prefix json: <http://purl.org/ns/json#> .'
print '@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .'
print '@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .'
print 

r_json = re.compile(r'^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]+$')
r_string = re.compile(r'("(\\.|[^"\\])*")')
env = {'__builtins__': None, 'null': None, 
       'true': True, 'false': False}

def json(text): 
   """Evaluate JSON text safely (we hope)."""
   if r_json.match(r_string.sub('', text)): 
      text = r_string.sub(lambda m: 'u' + m.group(1), text)
      return eval(text.strip(' \t\r\n'), env, {})
   raise ValueError('Input must be serialised JSON.')

def json_value(value): 
   if isinstance(value, dict): 
      for line in json_object(value): 
         yield line # + '\n'
   elif isinstance(value, list): 
      for line in json_array(value): 
         yield line # + '\n'
   elif isinstance(value, float) or isinstance(value, int): 
      for line in json_number(value): 
         yield line
   elif isinstance(value, unicode): 
      for line in json_string(value): 
         yield line
   elif isinstance(value, bool): 
      for line in json_boolean(value): 
         yield line
   elif value == None: 
      yield 'json:null'
   else: raise ValueError('%r' % value)

def json_object(obj): 
   yield '[ a json:Object; '
   for (key, value) in obj.iteritems(): 
      yield '   json:member ['
      yield '      json:key ' + '\n'.join(json_string(key)) + '; '
      yield '      json:value ' + '\n'.join(json_value(value))
      yield ']; '
   yield ']'

def json_array(arr): 
   if arr: 
      yield '[ a json:Array; '
      first, rest = arr[0], arr[1:]
      yield '   rdf:first ' + '\n'.join(json_value(first)) + '; '
      if rest: 
         yield '   rdf:rest ('
         for element in rest: 
            for line in json_value(element): 
               yield line
         yield ')'
      else: yield '   rdf:rest rdf:nil'
      yield ']'
   else: yield 'rdf:nil'

def json_number(num): 
   lexical = str(num)
   if not 'e' in lexical: 
      yield '"' + lexical + '"^^xsd:decimal'
   else: yield '"' + lexical + '"^^xsd:float'

def json_string(s): 
   yield '"' + ('%r' % s).lstrip('u')[1:-1] + '"'

def json_boolean(b): 
   if b == True: 
      yield 'json:true'
   else: yield 'json:false'

def convert(text): 
   thing = json(text)
   if isinstance(thing, list): 
      for line in json_array(thing): 
         print line
   elif isinstance(thing, dict): 
      for line in json_object(thing): 
         print line
   print '.'

test = """
   {
      "Image": {
          "Width":  800,
          "Height": 600,
          "Title":  "View from 15th Floor",
          "Thumbnail": {
              "Url":    "http://www.example.com/image/481989943",
              "Height": 125,
              "Width":  "100"
          },
          "IDs": [116, 943, 234, 38793]
        }
   }
"""

convert(test)

# EOF