1package goquery
2
3import "golang.org/x/net/html"
4
5// Is checks the current matched set of elements against a selector and
6// returns true if at least one of these elements matches.
7func (s *Selection) Is(selector string) bool {
8	return s.IsMatcher(compileMatcher(selector))
9}
10
11// IsMatcher checks the current matched set of elements against a matcher and
12// returns true if at least one of these elements matches.
13func (s *Selection) IsMatcher(m Matcher) bool {
14	if len(s.Nodes) > 0 {
15		if len(s.Nodes) == 1 {
16			return m.Match(s.Nodes[0])
17		}
18		return len(m.Filter(s.Nodes)) > 0
19	}
20
21	return false
22}
23
24// IsFunction checks the current matched set of elements against a predicate and
25// returns true if at least one of these elements matches.
26func (s *Selection) IsFunction(f func(int, *Selection) bool) bool {
27	return s.FilterFunction(f).Length() > 0
28}
29
30// IsSelection checks the current matched set of elements against a Selection object
31// and returns true if at least one of these elements matches.
32func (s *Selection) IsSelection(sel *Selection) bool {
33	return s.FilterSelection(sel).Length() > 0
34}
35
36// IsNodes checks the current matched set of elements against the specified nodes
37// and returns true if at least one of these elements matches.
38func (s *Selection) IsNodes(nodes ...*html.Node) bool {
39	return s.FilterNodes(nodes...).Length() > 0
40}
41
42// Contains returns true if the specified Node is within,
43// at any depth, one of the nodes in the Selection object.
44// It is NOT inclusive, to behave like jQuery's implementation, and
45// unlike Javascript's .contains, so if the contained
46// node is itself in the selection, it returns false.
47func (s *Selection) Contains(n *html.Node) bool {
48	return sliceContains(s.Nodes, n)
49}
50