From 8bef3ef15b0474cd9509bbed731066dd28b72cf6 Mon Sep 17 00:00:00 2001
From: mdrokz <33598169+mdrokz@users.noreply.github.com>
Date: Sat, 14 Aug 2021 14:34:43 +0530
Subject: [PATCH] added support for -n+A for :nth-child

---
 selector.go | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/selector.go b/selector.go
index 6249f77..728981b 100644
--- a/selector.go
+++ b/selector.go
@@ -524,8 +524,18 @@ func parseNthPseudo(cmd string) (PseudoClass, error) {
 			return n.Type == html.ElementNode && countNth(n)%cycle == offset
 		}, nil
 	}
+
+	r = regexp.MustCompile(`^-n[ ]?\+[ ]?([0-9])`)
+	subMatch = r.FindAllStringSubmatch(number, -1)
+	if len(subMatch) == 1 && len(subMatch[0]) == 2 {
+		offset, _ := strconv.Atoi(subMatch[0][1])
+		return func(n *html.Node) bool {
+			return n.Type == html.ElementNode && countNth(n) <= offset
+		}, nil
+	}
+
 	// check against 'n+2' pattern
-	r = regexp.MustCompile(`n[ ]?\+[ ]?([0-9])`)
+	r = regexp.MustCompile(`^n[ ]?\+[ ]?([0-9])`)
 	subMatch = r.FindAllStringSubmatch(number, -1)
 	if len(subMatch) == 1 && len(subMatch[0]) == 2 {
 		offset, _ := strconv.Atoi(subMatch[0][1])