1 files changed, 32 insertions, 0 deletions
diff --git a/xpcom/base/nsIDUtils.h b/xpcom/base/nsIDUtils.h
new file mode 100644
index 0000000000..ffb9d02f19
--- /dev/null
+++ b/xpcom/base/nsIDUtils.h
@@ -0,0 +1,32 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef XPCOM_BASE_NSIDUTILS_H_
+#define XPCOM_BASE_NSIDUTILS_H_
+
+#include "nsID.h"
+#include "nsString.h"
+#include "nsTString.h"
+
+/**
+ * Trims the brackets around the nsID string, since it wraps its ID with
+ * brackets: {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}.
+ */
+template <typename T>
+class NSID_TrimBrackets : public nsTAutoString<T> {
+ public:
+  explicit NSID_TrimBrackets(const nsID& aID) {
+    nsIDToCString toCString(aID);
+    // The string from nsIDToCString::get() includes a null terminator.
+    // Thus this trims 3 characters: `{`, `}`, and the null terminator.
+    this->AssignASCII(toCString.get() + 1, NSID_LENGTH - 3);
+  }
+};
+
+using NSID_TrimBracketsUTF16 = NSID_TrimBrackets<char16_t>;
+using NSID_TrimBracketsASCII = NSID_TrimBrackets<char>;
+
+#endif  // XPCOM_BASE_NSIDUTILS_H_