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Redfoot

Assertions Page Handler ( Page Handler )

• http://redfoot.net/3.0/code#python,

  # TODO: move this somewhere we can import it... we're already using it in two places.
  def node(data):
      if data["type"]=="URIRef":
          return URIRef(data["uri"])
      elif data["type"]=="BNode":
          return BNode(data["bnode"])        
      elif data["type"]=="Literal":
          datatype = data["datatype"] or None
          language = data["language"] or None
          return Literal(data["value"], lang=language, datatype=datatype)
      else:
          raise Exception("Unexpected type: '%s'" % data["type"])
  from rdflib import RDFS
  import simplejson
  assertions = []
  subject = request.parameters.get("subject")
  if subject:
      # TODO: support for BNodes
      data = simplejson.loads(subject)
      subject = node(data)
      initial_predicates = [RDFS.label, RDFS.comment, RDF.type]
      remaining_predicates = []
      for p in set(redfoot.predicates(subject, None)):
          if p not in initial_predicates:
              remaining_predicates.append((redfoot.label(p), p))
      remaining_predicates.sort()
      predicates = []
      for p in initial_predicates:
          predicates.append((redfoot.label(p), p))
      predicates.extend(remaining_predicates)
      for label, p in predicates:
          for o in redfoot.objects(subject, p):
              if isinstance(o, URIRef):
                  value = {"type": "URIRef", "label": redfoot.label(o), "uri": o}
              elif isinstance(o, BNode):
                  value = {"type": "BNode", "label": redfoot.label(o), "bnode": o}
              elif isinstance(o, Literal):
                  value = {"type": "Literal", "value": o, "datatype": o.datatype or "", "language": o.language or ""}
              else:
                  raise Exception("unexpected type: %s" % type(o))
              assertions.append({"predicate": {"type": "URIRef", "label": label, "uri": p}, 
                                 "object": value})
  response.write(simplejson.dumps(assertions))
          

• content_type,

  application/json