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