122 lines
3.9 KiB
C++
122 lines
3.9 KiB
C++
// 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>();
|
|
}
|
|
|
|
//! Get the size of string in bytes in the string buffer.
|
|
size_t GetSize() const { return stack_.GetSize(); }
|
|
|
|
//! Get the length of string in Ch in the string buffer.
|
|
size_t GetLength() const { return stack_.GetSize() / sizeof(Ch); }
|
|
|
|
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_
|