From 3c72bfd7a1533b53a9ed0cd66473569f3b490951 Mon Sep 17 00:00:00 2001
From: Viacheslav Poturaev <vearutop@gmail.com>
Date: Mon, 6 Feb 2023 09:54:16 +0100
Subject: [PATCH] Add a check for redundant . and e in number parser

---
 parser.go      | 14 +++++++++++++-
 parser_test.go |  2 ++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/parser.go b/parser.go
index 885e184..f0dcb7b 100644
--- a/parser.go
+++ b/parser.go
@@ -423,12 +423,24 @@ func parseRawString(s string) (string, string, error) {
 func parseRawNumber(s string) (string, string, error) {
 	// The caller must ensure len(s) > 0
 
+	dotFound := false
+	eFound := false
+
 	// Find the end of the number.
 	for i := 0; i < len(s); i++ {
 		ch := s[i]
-		if (ch >= '0' && ch <= '9') || ch == '.' || ch == '-' || ch == 'e' || ch == 'E' || ch == '+' {
+		if (ch >= '0' && ch <= '9') || ch == '-' || ch == '+' {
+			continue
+		}
+		if ch == '.' && !dotFound {
+			dotFound = true
 			continue
 		}
+		if (ch == 'e' || ch == 'E') && !eFound {
+			eFound = true
+			continue
+		}
+
 		if i == 0 || i == 1 && (s[0] == '-' || s[0] == '+') {
 			if len(s[i:]) >= 3 {
 				xs := s[i : i+3]
diff --git a/parser_test.go b/parser_test.go
index b691185..db975e5 100644
--- a/parser_test.go
+++ b/parser_test.go
@@ -44,6 +44,8 @@ func TestParseRawNumber(t *testing.T) {
 		f("Inftail", "Inf", "tail")
 		f("-INF", "-INF", "")
 		f("-Inftail", "-Inf", "tail")
+		f("1.2.3.4", "1.2", ".3.4")
+		f("-12.345e67e70", "-12.345e67", "e70")
 	})
 
 	t.Run("error", func(t *testing.T) {