preparing for v0.5

src/utils/functional/stringable.go

@@ -0,0 +1,68 @@
+package functional
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+type Stringable struct{ string }
+
+func NewStringable(v any) Stringable {
+	switch vv := v.(type) {
+	case string:
+		return Stringable{vv}
+	case fmt.Stringer:
+		return Stringable{vv.String()}
+	default:
+		return Stringable{fmt.Sprint(vv)}
+	}
+}
+
+func (s Stringable) String() string {
+	return s.string
+}
+
+func (s Stringable) Len() int {
+	return len(s.string)
+}
+
+func (s Stringable) MarshalText() (text []byte, err error) {
+	return []byte(s.string), nil
+}
+
+func (s Stringable) SubStr(start int, end int) Stringable {
+	return Stringable{s.string[start:end]}
+}
+
+func (s Stringable) HasPrefix(p Stringable) bool {
+	return len(s.string) >= len(p.string) && s.string[0:len(p.string)] == p.string
+}
+
+func (s Stringable) HasSuffix(p Stringable) bool {
+	return len(s.string) >= len(p.string) && s.string[len(s.string)-len(p.string):] == p.string
+}
+
+func (s Stringable) IsEmpty() bool {
+	return len(s.string) == 0
+}
+
+func (s Stringable) IndexRune(r rune) int {
+	return strings.IndexRune(s.string, r)
+}
+
+func (s Stringable) ToInt() (int, error) {
+	return strconv.Atoi(s.string)
+}
+
+func (s Stringable) Split(sep string) []Stringable {
+	return Stringables(strings.Split(s.string, sep))
+}
+
+func Stringables(ss []string) []Stringable {
+	ret := make([]Stringable, len(ss))
+	for i, s := range ss {
+		ret[i] = Stringable{s}
+	}
+	return ret
+}