package shell

import "io"

type Token interface {
	Tokens() []Token
	AddToken(Token)
	String() string
}

type Expandable interface {
	Expand(state State, stdin io.Reader, stderr io.Writer) ([]string, uint8)
}

type Evalable interface {
	Evaluate(state State, stdin io.Reader, stdout io.Writer, stderr io.Writer) uint8
}

type BaseToken struct {
	tokens []Token
}

func (t *BaseToken) Tokens() []Token {
	return t.tokens
}

func (t *BaseToken) AddToken(token Token) {
	if token != nil {
		t.tokens = append(t.tokens, token)
	}
}

func (t *BaseToken) String() string {
	var str string

	for _, token := range t.Tokens() {
		str += token.String()
	}

	return str
}