// termFromJSON converts a SPARQL json result binding into a rdf.Term. Any
// parsing errors on typed-literal will result in a xsd:string-typed RDF term.
// TODO move this functionality to package rdf?
func termFromJSON(b binding) (rdf.Term, error) {
switch b.Type {
case "bnode":
return rdf.NewBlank(b.Value)
case "uri":
return rdf.NewIRI(b.Value)
case "literal":
// Untyped literals are typed as xsd:string
if b.Lang != "" {
return rdf.NewLangLiteral(b.Value, b.Lang)
}
return rdf.NewTypedLiteral(b.Value, xsdString), nil
case "typed-literal":
iri, err := rdf.NewIRI(b.DataType)
if err != nil {
return nil, err
}
return rdf.NewTypedLiteral(b.Value, iri), nil
default:
return nil, errors.New("unknown term type")
}
}
func TestSolutions(t *testing.T) {
b := bytes.NewBufferString(testResults)
r, err := ParseJSON(b)
if err != nil {
t.Fatal(err)
}
s := r.Solutions()
blankR1, _ := rdf.NewBlank("r1")
iriAlice, _ := rdf.NewIRI("http://work.example.org/alice/")
litAlice, _ := rdf.NewLiteral("Alice")
litBob, _ := rdf.NewLangLiteral("Bob", "en")
xsdInteger, _ := rdf.NewIRI("http://www.w3.org/2001/XMLSchema#integer")
xsdFloat, _ := rdf.NewIRI("http://www.w3.org/2001/XMLSchema#float")
xsdBoolean, _ := rdf.NewIRI("http://www.w3.org/2001/XMLSchema#boolean")
xsdDateTime, _ := rdf.NewIRI("http://www.w3.org/2001/XMLSchema#dateTime")
var tests = []struct {
got rdf.Term
want rdf.Term
}{
{s[0]["x"], blankR1},
{s[0]["hpage"], iriAlice},
{s[0]["name"], litAlice},
{s[1]["name"], litBob},
{s[0]["age"], rdf.NewTypedLiteral("17", xsdInteger)},
{s[0]["score"], rdf.NewTypedLiteral("0.2", xsdFloat)},
{s[0]["z"], rdf.NewTypedLiteral("true", xsdBoolean)},
{s[1]["z"], rdf.NewTypedLiteral("false", xsdBoolean)},
{s[0]["updated"], rdf.NewTypedLiteral("2014-07-21T04:00:40+02:00", xsdDateTime)},
}
for _, tt := range tests {
if !rdf.TermsEqual(tt.got, tt.want) {
t.Errorf("Got \"%v\", want \"%v\"", tt.got, tt.want)
}
}
}
func init() {
xsdString, _ = rdf.NewIRI("http://www.w3.org/2001/XMLSchema#string")
}