package ast

import (
	"fmt"
)

// VariableAccess represents a variable access.
type VariableAccess struct {
	Name string
	Posx Pos
}

func (n *VariableAccess) Accept(v Visitor) Node {
	return v(n)
}

func (n *VariableAccess) Pos() Pos {
	return n.Posx
}

func (n *VariableAccess) GoString() string {
	return fmt.Sprintf("*%#v", *n)
}

func (n *VariableAccess) String() string {
	return fmt.Sprintf("Variable(%s)", n.Name)
}

func (n *VariableAccess) Type(s Scope) (Type, error) {
	v, ok := s.LookupVar(n.Name)
	if !ok {
		return TypeInvalid, fmt.Errorf("unknown variable: %s", n.Name)
	}

	return v.Type, nil
}