// Validate uses its Schema to check an xml doc. If the doc fails to match
// the schema, an error is returned, nil otherwise.
// At the moment, the error just says that the document failed. It doesn't
// say where and why. It needs to - help greatly appreciated.
func (s *Schema) Validate(doc DocPtr) error {
validCtxt := C.xmlSchemaNewValidCtxt(s.Ptr)
if validCtxt == nil {
// TODO find error - see below
return errors.New("Could not build validator")
}
defer C.xmlSchemaFreeValidCtxt(validCtxt)
/*
// My plan was to register my go func to receive errors and pass it an
// error ptr specific to this validation (useful for multiple goroutines).
// Alas it doesn't work, help appreciated.
var err *error
if C.xmlSchemaGetValidErrors(validCtxt, C.schemaValidityErrorFunc, nil, unsafe.Pointer(err)) == -1 {
return errors.New("Could not set error func.")
}
*/
if C.xmlSchemaValidateDoc(validCtxt, doc) != 0 {
//return errors.New(*err) // When the above works
return errors.New("Document validation error")
}
return nil
}
// Validate - Schemavalidate the document against the the schema file given in url
func (xp *Xp) SchemaValidate(url string) (errs []string, err error) {
cSchemaNewMemParserCtxt := C.xmlSchemaNewParserCtxt((*C.char)(unsafe.Pointer(C.CString(url))))
if cSchemaNewMemParserCtxt == nil {
return nil, errors.New("Could not create schema parser")
}
defer C.xmlSchemaFreeParserCtxt(cSchemaNewMemParserCtxt)
cSchema := C.xmlSchemaParse(cSchemaNewMemParserCtxt)
if cSchema == nil {
return nil, errors.New("Could not parse schema")
}
defer C.xmlSchemaFree(cSchema)
validCtxt := C.xmlSchemaNewValidCtxt(cSchema)
if validCtxt == nil {
return nil, errors.New("Could not build validator")
}
defer C.xmlSchemaFreeValidCtxt(validCtxt)
// void_libxml_error_handler is a null function - no info collected - just the final result matters - for now
C.xmlSchemaSetValidErrors(validCtxt, (*[0]byte)(C.void_libxml_error_handler), (*[0]byte)(C.void_libxml_error_handler), nil)
if errno := C.xmlSchemaValidateDoc(validCtxt, xp.doc); errno != 0 {
return nil, fmt.Errorf("Document validation error %d", errno)
}
return nil, nil
}