| // Tencent is pleased to support the open source community by making RapidJSON available. |
| // |
| // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved. |
| // |
| // Licensed under the MIT License (the "License"); you may not use this file except |
| // in compliance with the License. You may obtain a copy of the License at |
| // |
| // http://opensource.org/licenses/MIT |
| // |
| // Unless required by applicable law or agreed to in writing, software distributed |
| // under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR |
| // CONDITIONS OF ANY KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations under the License. |
| |
| #ifndef RAPIDJSON_STRINGBUFFER_H_ |
| #define RAPIDJSON_STRINGBUFFER_H_ |
| |
| #include "stream.h" |
| #include "internal/stack.h" |
| |
| #if RAPIDJSON_HAS_CXX11_RVALUE_REFS |
| #include <utility> // std::move |
| #endif |
| |
| #include "internal/stack.h" |
| |
| #if defined(__clang__) |
| RAPIDJSON_DIAG_PUSH |
| RAPIDJSON_DIAG_OFF(c++98-compat) |
| #endif |
| |
| RAPIDJSON_NAMESPACE_BEGIN |
| |
| //! Represents an in-memory output stream. |
| /*! |
| \tparam Encoding Encoding of the stream. |
| \tparam Allocator type for allocating memory buffer. |
| \note implements Stream concept |
| */ |
| template <typename Encoding, typename Allocator = CrtAllocator> |
| class GenericStringBuffer { |
| public: |
| typedef typename Encoding::Ch Ch; |
| |
| GenericStringBuffer(Allocator* allocator = 0, size_t capacity = kDefaultCapacity) : stack_(allocator, capacity) {} |
| |
| #if RAPIDJSON_HAS_CXX11_RVALUE_REFS |
| GenericStringBuffer(GenericStringBuffer&& rhs) : stack_(std::move(rhs.stack_)) {} |
| GenericStringBuffer& operator=(GenericStringBuffer&& rhs) { |
| if (&rhs != this) |
| stack_ = std::move(rhs.stack_); |
| return *this; |
| } |
| #endif |
| |
| void Put(Ch c) { *stack_.template Push<Ch>() = c; } |
| void PutUnsafe(Ch c) { *stack_.template PushUnsafe<Ch>() = c; } |
| void Flush() {} |
| |
| void Clear() { stack_.Clear(); } |
| void ShrinkToFit() { |
| // Push and pop a null terminator. This is safe. |
| *stack_.template Push<Ch>() = '\0'; |
| stack_.ShrinkToFit(); |
| stack_.template Pop<Ch>(1); |
| } |
| |
| void Reserve(size_t count) { stack_.template Reserve<Ch>(count); } |
| Ch* Push(size_t count) { return stack_.template Push<Ch>(count); } |
| Ch* PushUnsafe(size_t count) { return stack_.template PushUnsafe<Ch>(count); } |
| void Pop(size_t count) { stack_.template Pop<Ch>(count); } |
| |
| const Ch* GetString() const { |
| // Push and pop a null terminator. This is safe. |
| *stack_.template Push<Ch>() = '\0'; |
| stack_.template Pop<Ch>(1); |
| |
| return stack_.template Bottom<Ch>(); |
| } |
| |
| size_t GetSize() const { return stack_.GetSize(); } |
| |
| static const size_t kDefaultCapacity = 256; |
| mutable internal::Stack<Allocator> stack_; |
| |
| private: |
| // Prohibit copy constructor & assignment operator. |
| GenericStringBuffer(const GenericStringBuffer&); |
| GenericStringBuffer& operator=(const GenericStringBuffer&); |
| }; |
| |
| //! String buffer with UTF8 encoding |
| typedef GenericStringBuffer<UTF8<> > StringBuffer; |
| |
| template<typename Encoding, typename Allocator> |
| inline void PutReserve(GenericStringBuffer<Encoding, Allocator>& stream, size_t count) { |
| stream.Reserve(count); |
| } |
| |
| template<typename Encoding, typename Allocator> |
| inline void PutUnsafe(GenericStringBuffer<Encoding, Allocator>& stream, typename Encoding::Ch c) { |
| stream.PutUnsafe(c); |
| } |
| |
| //! Implement specialized version of PutN() with memset() for better performance. |
| template<> |
| inline void PutN(GenericStringBuffer<UTF8<> >& stream, char c, size_t n) { |
| std::memset(stream.stack_.Push<char>(n), c, n * sizeof(c)); |
| } |
| |
| RAPIDJSON_NAMESPACE_END |
| |
| #if defined(__clang__) |
| RAPIDJSON_DIAG_POP |
| #endif |
| |
| #endif // RAPIDJSON_STRINGBUFFER_H_ |