Function namespaceFunc

func.go:205–227

namespaceFunc is a XPath functions namespace-uri([node-set]).

(arg query)

// namespaceFunc is a XPath functions namespace-uri([node-set]).
func namespaceFunc(arg query) func(query, iterator) interface{} {
	return func(_ query, t iterator) interface{} {
		var v NodeNavigator
		if arg == nil {
			v = t.Current()
		} else {
			// Get the first node in the node-set if specified.
			v = arg.Clone().Select(t)
			if v == nil {
				return ""
			}
		}
		// fix about namespace-uri() bug: https://github.com/antchfx/xmlquery/issues/22
		// TODO: In the next version, add NamespaceURL() to the NodeNavigator interface.
		type namespaceURL interface {
			NamespaceURL() string
		}
		if f, ok := v.(namespaceURL); ok {
			return f.NamespaceURL()
		}
		return v.Prefix()
	}
}

func asBool(t iterator, v interface{}) bool {
	switch v := v.(type) {