waiig15/ast/let.go

package ast

import (
	"code.osinet.fr/fgm/waiig15/token"
	"bytes"
)

// LetStatement is the Node type for Let statements.
type LetStatement struct {
	Token token.Token // the token.LET token. Why do we need it ?
	Name  *Identifier
	Value Expression
}

// String implements Node and fmt.Stringer.
func (ls *LetStatement) String() string {
	var out bytes.Buffer

	out.WriteString(ls.TokenLiteral() + " ")
	out.WriteString(ls.Name.String())
	out.WriteString(" = ")
	if ls.Value != nil {
		out.WriteString(ls.Value.String())
	}

	out.WriteString(";")

	return out.String()
}

func (ls *LetStatement) statementNode() {}

// TokenLiteral satisfies the Node interface.
func (ls *LetStatement) TokenLiteral() string {
	return ls.Token.Literal
}