#!/usr/bin/env python
"""
com.inamidst.addrdf - Arcs Add RDF Widget
Author: Sean B. Palmer, inamidst.com
"""

import trio

def parse_value(s):
   s = s.replace('\\"', '"')
   s = s.replace('\\t', '\t')
   s = s.replace('\\r', '\r')
   s = s.replace('\\n', '\n')
   return s.decode('unicode-escape')

def parse_term(string):
   if string.startswith('<'):
      return trio.rdf.URIReference(parse_value(string[1:-1]))
   elif string.startswith('_:'):
      return trio.rdf.BlankNode(string[2:])
   elif string.startswith('"'):
      return trio.rdf.PlainLiteral(parse_value(string[1:-1]))
   raise ValueError(string)

def main(arcs, write, params): 
   term = params['uri'][0]
   node = parse_term(term)
   uri = node.value

   try: label, facts = arcs.library.add(uri)
   except Exception, e: 
      write('Error: ' + str(e))
   else: write('Loaded %s facts' % facts)

if __name__ == '__main__': 
   print __doc__