func (s *selectionSpec) match(r *marc21.MarcRecord) bool {
if s.field == "" {
return true
}
if marc21.IsControlFieldTag(s.field) {
field, err := r.GetControlField(s.field)
if err != nil {
return false
}
if s.criterion != nil {
return s.criterion.MatchString(field)
}
return true
} else { // Data Field
subfields := make([]string, 1)
field, _ := r.GetDataField(s.field)
for instance := 0; instance < field.ValueCount(); instance++ {
// if no subfield is specified in the spec then
// we want to search all of them. since these can
// vary per field instance we need to get the list
// each time.
if s.subfield != "" {
subfields[0] = s.subfield
} else {
subfields = field.GetSubfields(instance)
}
for _, subfield := range subfields {
sfv := field.GetNthSubfield(subfield, instance)
if sfv != "" {
// the subfield exists: need to check because the
// user supplied subfield may not exist in this
// instance
if s.criterion != nil {
// and there is a search criterion
if s.criterion.MatchString(sfv) {
// and it matches
return true
}
} else {
// no search criterion, but the field exists
return true
}
}
}
}
return false
}
}
func printRecord(record *marc21.MarcRecord, w *tabwriter.Writer) error {
fmt.Fprintf(w, "Leader\t%s\n", record.GetLeader())
fields := record.GetFieldList()
for _, f := range fields {
if marc21.IsControlFieldTag(f) {
v, _ := record.GetControlField(f)
fmt.Fprintf(w, "%s\t%s\n", f, v)
} else {
v, _ := record.GetDataField(f)
printDataField(w, v)
}
}
w.Flush()
return nil
}