func()

in webdav/internal/xml/marshal.go [963:1094]
125 lines of code
42 McCabe index (conditional complexity)

func (p *printer) marshalStruct(tinfo *typeInfo, val reflect.Value) error {
	s := parentStack{p: p}
	for i := range tinfo.fields {
		finfo := &tinfo.fields[i]
		if finfo.flags&fAttr != 0 {
			continue
		}
		vf := finfo.value(val)

		// Dereference or skip nil pointer, interface values.
		switch vf.Kind() {
		case reflect.Ptr, reflect.Interface:
			if !vf.IsNil() {
				vf = vf.Elem()
			}
		}

		switch finfo.flags & fMode {
		case fCharData:
			if err := s.setParents(&noField, reflect.Value{}); err != nil {
				return err
			}
			if vf.CanInterface() && vf.Type().Implements(textMarshalerType) {
				data, err := vf.Interface().(encoding.TextMarshaler).MarshalText()
				if err != nil {
					return err
				}
				Escape(p, data)
				continue
			}
			if vf.CanAddr() {
				pv := vf.Addr()
				if pv.CanInterface() && pv.Type().Implements(textMarshalerType) {
					data, err := pv.Interface().(encoding.TextMarshaler).MarshalText()
					if err != nil {
						return err
					}
					Escape(p, data)
					continue
				}
			}
			var scratch [64]byte
			switch vf.Kind() {
			case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
				Escape(p, strconv.AppendInt(scratch[:0], vf.Int(), 10))
			case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
				Escape(p, strconv.AppendUint(scratch[:0], vf.Uint(), 10))
			case reflect.Float32, reflect.Float64:
				Escape(p, strconv.AppendFloat(scratch[:0], vf.Float(), 'g', -1, vf.Type().Bits()))
			case reflect.Bool:
				Escape(p, strconv.AppendBool(scratch[:0], vf.Bool()))
			case reflect.String:
				if err := EscapeText(p, []byte(vf.String())); err != nil {
					return err
				}
			case reflect.Slice:
				if elem, ok := vf.Interface().([]byte); ok {
					if err := EscapeText(p, elem); err != nil {
						return err
					}
				}
			}
			continue

		case fComment:
			if err := s.setParents(&noField, reflect.Value{}); err != nil {
				return err
			}
			k := vf.Kind()
			if !(k == reflect.String || k == reflect.Slice && vf.Type().Elem().Kind() == reflect.Uint8) {
				return fmt.Errorf("xml: bad type for comment field of %s", val.Type())
			}
			if vf.Len() == 0 {
				continue
			}
			p.writeIndent(0)
			p.WriteString("<!--")
			dashDash := false
			dashLast := false
			switch k {
			case reflect.String:
				s := vf.String()
				dashDash = strings.Index(s, "--") >= 0
				dashLast = s[len(s)-1] == '-'
				if !dashDash {
					p.WriteString(s)
				}
			case reflect.Slice:
				b := vf.Bytes()
				dashDash = bytes.Index(b, ddBytes) >= 0
				dashLast = b[len(b)-1] == '-'
				if !dashDash {
					p.Write(b)
				}
			default:
				panic("can't happen")
			}
			if dashDash {
				return fmt.Errorf(`xml: comments must not contain "--"`)
			}
			if dashLast {
				// "--->" is invalid grammar. Make it "- -->"
				p.WriteByte(' ')
			}
			p.WriteString("-->")
			continue

		case fInnerXml:
			iface := vf.Interface()
			switch raw := iface.(type) {
			case []byte:
				p.Write(raw)
				continue
			case string:
				p.WriteString(raw)
				continue
			}

		case fElement, fElement | fAny:
			if err := s.setParents(finfo, vf); err != nil {
				return err
			}
		}
		if err := p.marshalValue(vf, finfo, nil); err != nil {
			return err
		}
	}
	if err := s.setParents(&noField, reflect.Value{}); err != nil {
		return err
	}
	return p.cachedWriteError()
}