package main

import (
	"encoding/xml"
)

type docType struct {
	animals *animalsType
}

type animalsType struct {
	XMLName xml.Name      `xml:"animals"`
	Chimp   []*animalType `xml:"chimp"`
	Cat     []*animalType `xml:"cat"`
}

type animalType struct {
	Name string   `xml:"name,attr"`
	Food foodType `xml:"food"`
}

type foodType struct {
	Text string `xml:",chardata"`
}

func parse(xmldoc string) (*docType, error) {
	var animals animalsType
	err := xml.Unmarshal([]byte(xmldoc), &animals)
	return &docType{
		animals: &animals,
	}, err
}

func (doc *docType) run(xpath *xPath) []interface{} {
	return xpath.do(doc)
}