waiig15/ast/prefix_expression.go

package ast

import (
	"bytes"

	"code.osinet.fr/fgm/waiig15/token"
)

// ExpressionStatement fulfills the Node and Statement interfaces.
// It represents a prefixed expression like:
// "-5;"
type PrefixExpression struct {
	Token    token.Token
	Operator string
	Right    Expression
}

// String satisfies the Node and fmt.Stringer interfaces.
func (pe *PrefixExpression) String() string {
	var out bytes.Buffer

	out.WriteString("(")
	out.WriteString(pe.Operator)
	out.WriteString(pe.Right.String())
	out.WriteString(")")

	return out.String()
}

func (pe *PrefixExpression) expressionNode() {}

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