From 54e9f5418e2065dae56886e3c2976129703a6327 Mon Sep 17 00:00:00 2001
From: cenright <cenright@yext.com>
Date: Wed, 15 Jul 2020 16:34:34 -0400
Subject: [PATCH] avoid panic on unknown escape sequence

---
 parse/quote.go      |  2 +-
 parse/quote_test.go | 14 ++++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/parse/quote.go b/parse/quote.go
index ccde4ef..6cf6813 100644
--- a/parse/quote.go
+++ b/parse/quote.go
@@ -76,7 +76,7 @@ func unquoteString(s string) (string, error) {
 			} else {
 				replacement, ok := unescapes[r]
 				if !ok {
-					return "", errors.New("unrecognized escape code: \\" + s[i:i+1])
+					return "", errors.New("unrecognized escape code: \\" + s[i-1:i])
 				}
 				r = rune(replacement)
 			}
diff --git a/parse/quote_test.go b/parse/quote_test.go
index 88e9692..1dcb6c8 100644
--- a/parse/quote_test.go
+++ b/parse/quote_test.go
@@ -41,3 +41,17 @@ func TestUnquote(t *testing.T) {
 		}
 	}
 }
+
+func TestUnquoteUnrecognized(t *testing.T) {
+	var tests = []string{
+		`'\0'`,
+		`'\a'`,
+		`'\z'`,
+	}
+	for _, tc := range tests {
+		_, err := unquoteString(tc)
+		if err == nil {
+			t.Errorf("expected unrecognized escape sequence %s to fail", tc)
+		}
+	}
+}