package main

import (
	"strings"

	"github.com/antchfx/htmlquery"
	"github.com/antchfx/xpath"
	"golang.org/x/net/html"
)

func main() {
	h := `<div>
<span></span>
<span>v</span>
</div>
`
	doc, err := html.Parse(strings.NewReader(h))
	if err != nil {
		return
	}

	query(doc, `//*[contains(normalize-space(),"v")]//text()`) // panic
	query(doc, `//*[contains(normalize-space(),"v")]`)         // print error
	query(doc, `//*[contains(normalize-space(.),"v")]`)        // correct
}

func query(n *html.Node, expr string) {
	p, err := xpath.Compile(expr)
	if err != nil {
		println(err.Error())
		return
	}

	htmlquery.QuerySelector(n, p)
}