// Write a single feature and return the number of bytes written and any error.
func (w *Writer) Write(f feat.Feature) (n int, err error) {
defer func() {
if err != nil {
return
}
_, err = w.w.Write([]byte{'\n'})
if err != nil {
return
}
n++
}()
// Handle Bed types.
if f, ok := f.(Bed); ok {
if !f.canBed(w.BedType) {
return 0, ErrBadBedType
}
return fmt.Fprintf(w.w, "%*s", w.BedType, f)
}
// Handle other feature types.
if f.Location() == nil {
return 0, ErrNoChromField
}
// Bed3
n, err = fmt.Fprintf(w.w, "%s\t%d\t%d", f.Location(), f.Start(), f.End())
if w.BedType == 3 {
return n, err
}
// Bed4
_n, err := fmt.Fprintf(w.w, "\t%s", f.Name())
n += _n
if w.BedType == 4 || err != nil {
return n, err
}
// Bed5
if f, ok := f.(Scorer); ok {
_n, err := fmt.Fprintf(w.w, "\t%d", f.Score())
n += _n
if err != nil {
return n, err
}
} else {
_n, err := fmt.Fprintf(w.w, "\t0")
n += _n
if err != nil {
return n, err
}
}
if w.BedType == 5 {
return
}
// Bed6
if f, ok := f.(feat.Orienter); ok {
_n, err := fmt.Fprintf(w.w, "\t%s", seq.Strand(f.Orientation()))
n += _n
if err != nil {
return n, err
}
} else {
_n, err := fmt.Fprintf(w.w, "\t.")
n += _n
if err != nil {
return n, err
}
}
if w.BedType == 6 || w.BedType == 0 {
return
}
// Don't handle Bed12.
_n, err = w.w.Write([]byte{'\n'})
n += _n
return n, ErrBadBedType
}
