[Feat] Role reaction (#15)

* first draft of rolereact

* fix(rolereact): fill description when setting it

* fix(rolereact): fix some issues

* feat(rolereact): split the code in multiple files

1 files changed, 115 insertions, 0 deletions

diff --git a/dynamicid/encoding.go b/dynamicid/encoding.go
new file mode 100644
index 0000000..23d00db
--- /dev/null
+++ b/dynamicid/encoding.go
@@ -0,0 +1,115 @@
+package dynamicid
+
+import (
+	"encoding/csv"
+	"fmt"
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+var (
+	stringReflectType = reflect.TypeOf(string(""))
+	intReflectType    = reflect.TypeOf(int(0))
+	uintReflectType   = reflect.TypeOf(uint(0))
+	boolReflectType   = reflect.TypeOf(bool(false))
+)
+
+// UnmarshallCSV record into a struct in-place
+func UnmarshallCSV(data string, v any) error {
+	r := csv.NewReader(strings.NewReader(data))
+	record, err := r.Read()
+	if err != nil {
+		return err
+	}
+	s := reflect.ValueOf(v).Elem()
+	t := s.Type()
+	if s.NumField() != len(record) {
+		return &ErrFieldMismatch{s.NumField(), len(record)}
+	}
+	for i := 0; i < s.NumField(); i++ {
+		f := s.Field(i)
+		if t.Field(i).Tag.Get("cid") != "-" {
+			switch f.Type() {
+			case stringReflectType:
+				f.SetString(record[i])
+			case intReflectType:
+				v, err := strconv.ParseInt(record[i], 10, 0)
+				if err != nil {
+					return err
+				}
+				f.SetInt(v)
+			case uintReflectType:
+				v, err := strconv.ParseUint(record[i], 10, 0)
+				if err != nil {
+					return err
+				}
+				f.SetUint(v)
+			case boolReflectType:
+				switch record[i] {
+				case "0":
+					f.SetBool(false)
+				case "1":
+					f.SetBool(true)
+				default:
+					return &ErrUnreadable{"boolean", record[i]}
+				}
+			default:
+				return &ErrUnsupportedType{Type: f.Type().String()}
+			}
+		}
+	}
+	return nil
+}
+
+// MarshallCSV from a struct
+func MarshallCSV(v any) string {
+	s := reflect.ValueOf(v)
+	r := make([]string, 0)
+	for i := 0; i < s.NumField(); i++ {
+		f := s.Field(i)
+		switch f.Type() {
+		case stringReflectType:
+			r = append(r, f.String())
+		case intReflectType:
+			r = append(r, strconv.FormatInt(f.Int(), 10))
+		case uintReflectType:
+			r = append(r, strconv.FormatUint(f.Uint(), 10))
+		case boolReflectType:
+			if f.Bool() {
+				r = append(r, "1")
+			} else {
+				r = append(r, "0")
+			}
+		}
+	}
+	b := new(strings.Builder)
+	w := csv.NewWriter(b)
+	w.Write(r)
+	w.Flush()
+	return b.String()
+}
+
+type ErrFieldMismatch struct {
+	Expected, Found int
+}
+
+func (e *ErrFieldMismatch) Error() string {
+	return fmt.Sprintf("CSV line fields mismatch. Expected %d found %d", e.Expected, e.Found)
+}
+
+type ErrUnreadable struct {
+	Format, Found string
+}
+
+func (e *ErrUnreadable) Error() string {
+	return fmt.Sprintf("Unreadable value as %s. Found %s", e.Format, e.Found)
+}
+
+type ErrUnsupportedType struct {
+	Type string
+}
+
+func (e *ErrUnsupportedType) Error() string {
+	return "Unsupported type: " + e.Type
+}