1 files changed, 171 insertions, 0 deletions
diff --git a/xpcom/string/nsString.h b/xpcom/string/nsString.h
new file mode 100644
index 0000000000..e86ea594ac
--- /dev/null
+++ b/xpcom/string/nsString.h
@@ -0,0 +1,171 @@
+/* -*- 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 nsString_h___
+#define nsString_h___
+
+#include <ostream>
+
+#include "mozilla/Attributes.h"
+
+#include "nsStringFwd.h"
+
+#include "nsAString.h"
+#include "nsDependentSubstring.h"
+#include "nsReadableUtils.h"
+
+#include "nsTString.h"
+
+static_assert(sizeof(char16_t) == 2, "size of char16_t must be 2");
+static_assert(sizeof(nsString::char_type) == 2,
+              "size of nsString::char_type must be 2");
+static_assert(nsString::char_type(-1) > nsString::char_type(0),
+              "nsString::char_type must be unsigned");
+static_assert(sizeof(nsCString::char_type) == 1,
+              "size of nsCString::char_type must be 1");
+
+static_assert(sizeof(nsTLiteralString<char>) == sizeof(nsTString<char>),
+              "nsLiteralCString can masquerade as nsCString, "
+              "so they must have identical layout");
+
+static_assert(sizeof(nsTLiteralString<char16_t>) == sizeof(nsTString<char16_t>),
+              "nsTLiteralString can masquerade as nsString, "
+              "so they must have identical layout");
+
+/**
+ * A helper class that converts a UTF-16 string to ASCII in a lossy manner
+ */
+class NS_LossyConvertUTF16toASCII : public nsAutoCString {
+ public:
+  explicit NS_LossyConvertUTF16toASCII(const char16ptr_t aString) {
+    LossyAppendUTF16toASCII(mozilla::MakeStringSpan(aString), *this);
+  }
+
+  NS_LossyConvertUTF16toASCII(const char16ptr_t aString, size_t aLength) {
+    LossyAppendUTF16toASCII(
+        Substring(static_cast<const char16_t*>(aString), aLength), *this);
+  }
+
+  explicit NS_LossyConvertUTF16toASCII(const nsAString& aString) {
+    LossyAppendUTF16toASCII(aString, *this);
+  }
+
+ private:
+  // NOT TO BE IMPLEMENTED
+  NS_LossyConvertUTF16toASCII(char) = delete;
+};
+
+class NS_ConvertASCIItoUTF16 : public nsAutoString {
+ public:
+  explicit NS_ConvertASCIItoUTF16(const char* aCString) {
+    AppendASCIItoUTF16(mozilla::MakeStringSpan(aCString), *this);
+  }
+
+  NS_ConvertASCIItoUTF16(const char* aCString, size_t aLength) {
+    AppendASCIItoUTF16(Substring(aCString, aLength), *this);
+  }
+
+  explicit NS_ConvertASCIItoUTF16(const nsACString& aCString) {
+    AppendASCIItoUTF16(aCString, *this);
+  }
+
+  explicit NS_ConvertASCIItoUTF16(mozilla::Span<const char> aCString) {
+    AppendASCIItoUTF16(aCString, *this);
+  }
+
+ private:
+  // NOT TO BE IMPLEMENTED
+  NS_ConvertASCIItoUTF16(char16_t) = delete;
+};
+
+/**
+ * A helper class that converts a UTF-16 string to UTF-8
+ */
+class NS_ConvertUTF16toUTF8 : public nsAutoCString {
+ public:
+  explicit NS_ConvertUTF16toUTF8(const char16ptr_t aString) {
+    AppendUTF16toUTF8(mozilla::MakeStringSpan(aString), *this);
+  }
+
+  NS_ConvertUTF16toUTF8(const char16ptr_t aString, size_t aLength) {
+    AppendUTF16toUTF8(Substring(static_cast<const char16_t*>(aString), aLength),
+                      *this);
+  }
+
+  explicit NS_ConvertUTF16toUTF8(const nsAString& aString) {
+    AppendUTF16toUTF8(aString, *this);
+  }
+
+  explicit NS_ConvertUTF16toUTF8(mozilla::Span<const char16_t> aString) {
+    AppendUTF16toUTF8(aString, *this);
+  }
+
+ private:
+  // NOT TO BE IMPLEMENTED
+  NS_ConvertUTF16toUTF8(char) = delete;
+};
+
+class NS_ConvertUTF8toUTF16 : public nsAutoString {
+ public:
+  explicit NS_ConvertUTF8toUTF16(const char* aCString) {
+    AppendUTF8toUTF16(mozilla::MakeStringSpan(aCString), *this);
+  }
+
+  NS_ConvertUTF8toUTF16(const char* aCString, size_t aLength) {
+    AppendUTF8toUTF16(Substring(aCString, aLength), *this);
+  }
+
+  explicit NS_ConvertUTF8toUTF16(const nsACString& aCString) {
+    AppendUTF8toUTF16(aCString, *this);
+  }
+
+  explicit NS_ConvertUTF8toUTF16(mozilla::Span<const char> aCString) {
+    AppendUTF8toUTF16(aCString, *this);
+  }
+
+ private:
+  // NOT TO BE IMPLEMENTED
+  NS_ConvertUTF8toUTF16(char16_t) = delete;
+};
+
+/**
+ * Converts an integer (signed/unsigned, 32/64bit) to its decimal string
+ * representation and returns it as an nsAutoCString/nsAutoString.
+ */
+template <typename T, typename U>
+nsTAutoString<T> IntToTString(const U aInt, const int aRadix = 10) {
+  nsTAutoString<T> string;
+  string.AppendInt(aInt, aRadix);
+  return string;
+}
+
+template <typename U>
+nsAutoCString IntToCString(const U aInt, const int aRadix = 10) {
+  return IntToTString<char>(aInt, aRadix);
+}
+
+template <typename U>
+nsAutoString IntToString(const U aInt, const int aRadix = 10) {
+  return IntToTString<char16_t>(aInt, aRadix);
+}
+
+// MOZ_DBG support
+
+inline std::ostream& operator<<(std::ostream& aOut, const nsACString& aString) {
+  aOut.write(aString.Data(), aString.Length());
+  return aOut;
+}
+
+inline std::ostream& operator<<(std::ostream& aOut, const nsAString& aString) {
+  return aOut << NS_ConvertUTF16toUTF8(aString);
+}
+
+// the following are included/declared for backwards compatibility
+#include "nsDependentString.h"
+#include "nsLiteralString.h"
+#include "nsPromiseFlatString.h"
+
+#endif  // !defined(nsString_h___)