`string-join(ancestor-or-self::*[position()<last()]/name(), '.') has an invalid token`

[u1735067]

Hello,

I might be misusing xpath, but I'm not able to use the name() function on the ancestor-or-self::* axis, is this expected?

I'm trying to use the following query: string-join(ancestor-or-self::*[position()<last()]/name(), '.')
The returned error is string-join(ancestor-or-self::*[position()<last()]/name(), '.') has an invalid token.
I would expect my.sub.key and my2.sub2.key2 to be returned.

Repro:

package main

import (
	"fmt"
	"strings"

	"github.com/antchfx/jsonquery"
	"github.com/antchfx/xpath"
)

func main() {
	s := `{
		"my": { "sub": { "key": "value" } },
		"my2": { "sub2": { "key2": "value" } }
	}
	`
	doc, err := jsonquery.Parse(strings.NewReader(s))
	if err != nil {
		panic(err)
	}
	leafs, err := jsonquery.QueryAll(doc, "//*[not(*)]")
	if err != nil {
		panic(err)
	}
	for _, selectedfield := range leafs {
		expr, err := xpath.Compile("string-join(ancestor-or-self::*[position()<last()]/name(), '.')")
		if err != nil {
			panic(fmt.Errorf("failed to compile: %w", err))
		}

		elt := jsonquery.CreateXPathNavigator(selectedfield)
		fmt.Printf("elt = %v\n", selectedfield.Data)

		n := expr.Evaluate(elt)
		iter, ok := n.(*xpath.NodeIterator)
		if !ok {
			fmt.Printf("res = %v\n", n)
			continue
		}

		if iter.MoveNext() {
			current := iter.Current()
			fmt.Printf("res[0] = %v\n", current)
			// debugf("res[0]-getvalue %v", current.(*jsonquery.NodeNavigator).GetValue())
			// debugf("res[0]-value %v", iter.Current().Value())
			continue
		}

		fmt.Println("no")
	}
}

[zhengchun]

in this package, name() cannot work with string-json(), it does not yet supporting this feature.