stringbuffer.h

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// 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


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&);
};

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);
}

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_