Fixed stringEnd escape handling

Author: daboyuka

parser.go

@@ -23,20 +23,18 @@ func nextValue(data []byte) int {
 // Tries to find the end of string
 // Support if string contains escaped quote symbols.
 func stringEnd(data []byte) int {
-	i := 0
-
-	for len(data) > i {
-		if data[i] != '"' {
-			i++
-			continue
-		}
-
-		// If it just escaped \", continue
-		if i >= 1 && data[i-1] == '\\' {
-			i++
-			continue
-		} else {
-			return i + 1
+	escaped := false
+	for i, c := range data {
+		switch c {
+		case '\\':
+			escaped = !escaped
+		case '"':
+			if !escaped {
+				return i + 1
+			}
+			escaped = false
+		default:
+			escaped = false
 		}
 	}
 

parser_test.go

@@ -127,6 +127,13 @@ var getTests = []Test{
 		isFound: true,
 		data:    `\\\"`,
 	},
+	Test{
+		desc:    `unescaped backslash quote`,
+		json:    `{"a": "\\"}`,
+		path:    []string{"a"},
+		isFound: true,
+		data:    `\\`,
+	},
 	Test{
 		desc:    `unicode in JSON`,
 		json:    `{"a": "15°C"}`,