package main

type debugVisitor struct{}

func debug(node node) string {
	d := new(debugVisitor)
	v, _ := node.accept(d)
	return v
}

// visitASTDefinitionsNode implements visitor.
func (d *debugVisitor) visitASTDefinitionsNode(a *astDefinitionsNode) (string, error) {
	v := "#" + a.name + "\n\n"

	for _, defNode := range a.definitions {
		def, _ := defNode.accept(d)
		v += def + "\n\n"
	}

	return v, nil
}

// visitDefinition implements visitor.
func (d *debugVisitor) visitDefinition(def *definitionNode) (string, error) {
	id, _ := def.identifier.accept(d)
	v := id + " [\n"

	for _, fNode := range def.fields {
		field, _ := fNode.accept(d)
		v += "\t" + field + "\n"
	}

	v += "]\n\n"

	return v, nil
}

// visitField implements visitor.
func (d *debugVisitor) visitField(g *fieldNode) (string, error) {
	left, _ := g.left.accept(d)
	right, _ := g.right.accept(d)
	return left + " = " + right + ";", nil
}

// visitIdentifier implements visitor.
func (d *debugVisitor) visitIdentifier(i *identifierNode) (string, error) {
	return i.value, nil
}

// visitName implements visitor.
func (d *debugVisitor) visitName(n *nameNode) (string, error) {
	return n.value, nil
}

var _ visitor = new(debugVisitor)