package main

import (
	"fmt"
	"io"
	"strings"
)

type marshaler interface {
	marshal(any, io.Writer) error
}

type rawMarshaler struct {
	m        marshaler
	checkNul bool
}

func (m *rawMarshaler) marshal(v any, w io.Writer) error {
	if s, ok := v.(string); ok {
		if m.checkNul && strings.ContainsRune(s, '\x00') {
			return fmt.Errorf("cannot output a string containing NUL character: %q", s)
		}
		_, err := w.Write([]byte(s))
		return err
	}
	return m.m.marshal(v, w)
}