From d6dadc6efcd8ea927c502377dc616474b6a24834 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matias=20Niemel=C3=A4?= <matias@yearofmoo.com>
Date: Thu, 9 Jul 2015 11:05:07 -0700
Subject: [PATCH] fix(router): fix broken `HashLocationStrategy` string issue
 for dart

---
 modules/angular2/src/router/hash_location_strategy.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/modules/angular2/src/router/hash_location_strategy.ts b/modules/angular2/src/router/hash_location_strategy.ts
index 09c58516c0..963f109f67 100644
--- a/modules/angular2/src/router/hash_location_strategy.ts
+++ b/modules/angular2/src/router/hash_location_strategy.ts
@@ -23,7 +23,12 @@ export class HashLocationStrategy extends LocationStrategy {
   path(): string {
     // the hash value is always prefixed with a `#`
     // and if it is empty then it will stay empty
-    return this._location.hash.substring(1);
+    var path = this._location.hash;
+
+    // Dart will complain if a call to substring is
+    // executed with a position value that extends the
+    // length of string.
+    return path.length > 0 ? path.substring(1) : path;
   }
 
   pushState(state: any, title: string, url: string) {