1 files changed, 106 insertions, 0 deletions
diff --git a/xpcom/string/nsTDependentSubstring.cpp b/xpcom/string/nsTDependentSubstring.cpp
new file mode 100644
index 0000000000..ba1620f98b
--- /dev/null
+++ b/xpcom/string/nsTDependentSubstring.cpp
@@ -0,0 +1,106 @@
+/* -*- 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/. */
+
+// FIXME: Due to an include cycle, we need to include `nsTSubstring` first.
+#include "nsTSubstring.h"
+#include "nsTDependentSubstring.h"
+
+template <typename T>
+void nsTDependentSubstring<T>::Rebind(const substring_type& str,
+                                      size_type startPos, size_type length) {
+  // If we currently own a buffer, release it.
+  this->Finalize();
+
+  size_type strLength = str.Length();
+
+  if (startPos > strLength) {
+    startPos = strLength;
+  }
+
+  char_type* newData =
+      const_cast<char_type*>(static_cast<const char_type*>(str.Data())) +
+      startPos;
+  size_type newLength = XPCOM_MIN(length, strLength - startPos);
+  DataFlags newDataFlags = DataFlags(0);
+  this->SetData(newData, newLength, newDataFlags);
+}
+
+template <typename T>
+void nsTDependentSubstring<T>::Rebind(const char_type* data, size_type length) {
+  NS_ASSERTION(data, "nsTDependentSubstring must wrap a non-NULL buffer");
+
+  // If we currently own a buffer, release it.
+  this->Finalize();
+
+  char_type* newData =
+      const_cast<char_type*>(static_cast<const char_type*>(data));
+  size_type newLength = length;
+  DataFlags newDataFlags = DataFlags(0);
+  this->SetData(newData, newLength, newDataFlags);
+}
+
+template <typename T>
+void nsTDependentSubstring<T>::Rebind(const char_type* aStart,
+                                      const char_type* aEnd) {
+  MOZ_RELEASE_ASSERT(aStart <= aEnd, "Overflow!");
+  this->Rebind(aStart, size_type(aEnd - aStart));
+}
+
+template <typename T>
+nsTDependentSubstring<T>::nsTDependentSubstring(const char_type* aStart,
+                                                const char_type* aEnd)
+    : substring_type(const_cast<char_type*>(aStart), aEnd - aStart,
+                     DataFlags(0), ClassFlags(0)) {
+  MOZ_RELEASE_ASSERT(aStart <= aEnd, "Overflow!");
+}
+
+#if defined(MOZ_USE_CHAR16_WRAPPER)
+template <typename T>
+template <typename Q, typename EnableIfChar16>
+nsTDependentSubstring<T>::nsTDependentSubstring(char16ptr_t aStart,
+                                                char16ptr_t aEnd)
+    : substring_type(static_cast<const char16_t*>(aStart),
+                     static_cast<const char16_t*>(aEnd)) {
+  MOZ_RELEASE_ASSERT(static_cast<const char16_t*>(aStart) <=
+                         static_cast<const char16_t*>(aEnd),
+                     "Overflow!");
+}
+#endif
+
+template <typename T>
+nsTDependentSubstring<T>::nsTDependentSubstring(const const_iterator& aStart,
+                                                const const_iterator& aEnd)
+    : substring_type(const_cast<char_type*>(aStart.get()),
+                     aEnd.get() - aStart.get(), DataFlags(0), ClassFlags(0)) {
+  MOZ_RELEASE_ASSERT(aStart.get() <= aEnd.get(), "Overflow!");
+}
+
+template <typename T>
+const nsTDependentSubstring<T> Substring(const T* aStart, const T* aEnd) {
+  MOZ_RELEASE_ASSERT(aStart <= aEnd, "Overflow!");
+  return nsTDependentSubstring<T>(aStart, aEnd);
+}
+
+template nsTDependentSubstring<char> const Substring<char>(char const*,
+                                                           char const*);
+template nsTDependentSubstring<char16_t> const Substring<char16_t>(
+    char16_t const*, char16_t const*);
+
+#if defined(MOZ_USE_CHAR16_WRAPPER)
+const nsTDependentSubstring<char16_t> Substring(char16ptr_t aData,
+                                                size_t aLength) {
+  return nsTDependentSubstring<char16_t>(aData, aLength);
+}
+
+const nsTDependentSubstring<char16_t> Substring(char16ptr_t aStart,
+                                                char16ptr_t aEnd) {
+  return Substring(static_cast<const char16_t*>(aStart),
+                   static_cast<const char16_t*>(aEnd));
+}
+#endif
+
+template class nsTDependentSubstring<char>;
+template class nsTDependentSubstring<char16_t>;