Bitopia/runtime/lib/container/string.go

package container

import (
	"unicode/utf8"
)

type String  []rune

type Encoding  int
const (
	UTF8  Encoding  =  iota
)

func StringFrom(bytes Bytes, e Encoding) (String, bool) {
	switch e {
	case UTF8:
		var str = make(String, 0, len(bytes) / 4)
		for len(bytes) > 0 {
			var char, size = utf8.DecodeRune(bytes)
			if char == utf8.RuneError { return nil, false }
			str = append(str, char)
			bytes = bytes[size:]
		}
		return str, true
	default:
		panic("unknown or unimplemented encoding")
	}
}

func (str String) Encode(e Encoding) Bytes {
	switch e {
	case UTF8:
		var buf = make(Bytes, 0, len(str))
		var chunk [4]byte
		for _, r := range str {
			var size = utf8.EncodeRune(chunk[:], r)
			for i := 0; i < size; i += 1 {
				buf = append(buf, chunk[i])
			}
		}
		return buf
	default:
		panic("unknown or unimplemented encoding")
	}
}