package main

import (
	"fmt"
	"log"

	"github.com/kr/pretty"
)

var xmldoc = `<?xml version="1.0"?>
<animals>
  <chimp name="aap">
    <food>banaan</food>
  </chimp>
  <cat name="mies">
    <food>ansjovis</food>
  </cat>
  <chimp name="aapje">
    <food>apenootjes</food>
  </chimp>
</animals>
`

func main() {
	doc, err := parse(xmldoc)
	if err != nil {
		log.Fatalln(err)
	}
	fmt.Println("\nGeparst XML-document:")
	pretty.Println(doc)

	fmt.Print(`
Query:
/animals/chimp[@naam="aap"]/food/text()
`)
	/*
	  SORT
	    COLLECT  'child' 'type' 'text' text
	      COLLECT  'child' 'name' 'node' food
	        COLLECT  'child' 'name' 'node' chimp
	          COLLECT  'child' 'name' 'node' animals
	            ROOT
	          PREDICATE
	            EQUAL =
	              COLLECT  'attributes' 'name' 'node' naam
	                NODE
	              ELEM Object is a string : aap
	                COLLECT  'attributes' 'name' 'node' naam
	                  NODE
	*/
	result := doc.run(&xPath{
		arg1: &dSort{
			arg1: &dCollect{
				ARG: collect__child__type__text__text,
				arg1: &dCollect{
					ARG: collect__child__food,
					arg1: &dCollect{
						ARG: collect__child__chimp,
						arg1: &dCollect{
							ARG:  collect__child__animals,
							arg1: &dRoot{},
						},
						arg2: &dPredicate{
							arg1: &dEqual{
								ARG: equal__is,
								arg1: &dCollect{
									ARG:  collect__attributes__name,
									arg1: &dNode{},
								},
								arg2: &dElem{
									DATA: []interface{}{"aap"},
									arg1: &dCollect{
										ARG:  collect__attributes__name,
										arg1: &dNode{},
									},
								},
							},
						},
					},
				},
			},
		},
	})
	fmt.Println("\nZoekresultaat:")
	pretty.Println(result)
	fmt.Println()
}