From 285c99e3c48d7d678e699a1baf3f70830889f21f Mon Sep 17 00:00:00 2001
From: Aliaksandr Valialkin <valyala@gmail.com>
Date: Sat, 16 Jun 2018 16:08:53 +0300
Subject: [PATCH] Issue #5: properly validate `001` number

---
 validate.go      | 8 ++++----
 validate_test.go | 1 +
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/validate.go b/validate.go
index beadd05..16a10d8 100644
--- a/validate.go
+++ b/validate.go
@@ -249,15 +249,15 @@ func validateNumber(s string) (string, error) {
 		}
 		i++
 	}
-	if i == 0 {
+	if i <= 0 {
 		return s, fmt.Errorf("expecting 0..9 digit, got %c", s[0])
 	}
-	if i >= len(s) {
-		return "", nil
-	}
 	if s[0] == '0' && i != 1 {
 		return s, fmt.Errorf("unexpected number starting from 0")
 	}
+	if i >= len(s) {
+		return "", nil
+	}
 	if s[i] == '.' {
 		// Validate fractional part
 		s = s[i+1:]
diff --git a/validate_test.go b/validate_test.go
index 8001908..998e74a 100644
--- a/validate_test.go
+++ b/validate_test.go
@@ -99,6 +99,7 @@ func TestValidate(t *testing.T) {
 		"123.",
 		"123.345",
 		"001 ",
+		"001",
 
 		// object
 		"{}",