xpcom/base/JSONStringWriteFuncs.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef JSONSTRINGWRITEFUNCS_H
   8 #define JSONSTRINGWRITEFUNCS_H
   9
  10 #include "mozilla/JSONWriter.h"
  11 #include "nsString.h"
  12
  13 #include <type_traits>
  14
  15 namespace mozilla {
  16
  17 // JSONWriteFunc that writes to an owned string.
  18 template <typename StringType>
  19 class JSONStringWriteFunc final : public JSONWriteFunc {
  20   static_assert(
  21       !std::is_reference_v<StringType>,
  22       "Use JSONStringRefWriteFunc instead to write to a referenced string");
  23
  24  public:
  25   JSONStringWriteFunc() = default;
  26
  27   void Write(const Span<const char>& aStr) final { mString.Append(aStr); }
  28
  29   const StringType& StringCRef() const { return mString; }
  30
  31   StringType&& StringRRef() && { return std::move(mString); }
  32
  33  private:
  34   StringType mString;
  35 };
  36
  37 // JSONWriteFunc that writes to a given nsACString reference.
  38 class JSONStringRefWriteFunc final : public JSONWriteFunc {
  39  public:
  40   MOZ_IMPLICIT JSONStringRefWriteFunc(nsACString& aString) : mString(aString) {}
  41
  42   void Write(const Span<const char>& aStr) final { mString.Append(aStr); }
  43
  44   const nsACString& StringCRef() const { return mString; }
  45
  46  private:
  47   nsACString& mString;
  48 };
  49
  50 }  // namespace mozilla
  51
  52 #endif  // JSONSTRINGWRITEFUNCS_H