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180 lines
5.3 KiB
C
180 lines
5.3 KiB
C
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// 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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#include "rapidjson.h"
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#ifndef RAPIDJSON_STREAM_H_
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#define RAPIDJSON_STREAM_H_
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#include "encodings.h"
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RAPIDJSON_NAMESPACE_BEGIN
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///////////////////////////////////////////////////////////////////////////////
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// Stream
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/*! \class rapidjson::Stream
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\brief Concept for reading and writing characters.
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For read-only stream, no need to implement PutBegin(), Put(), Flush() and PutEnd().
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For write-only stream, only need to implement Put() and Flush().
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\code
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concept Stream {
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typename Ch; //!< Character type of the stream.
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//! Read the current character from stream without moving the read cursor.
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Ch Peek() const;
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//! Read the current character from stream and moving the read cursor to next character.
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Ch Take();
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//! Get the current read cursor.
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//! \return Number of characters read from start.
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size_t Tell();
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//! Begin writing operation at the current read pointer.
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//! \return The begin writer pointer.
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Ch* PutBegin();
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//! Write a character.
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void Put(Ch c);
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//! Flush the buffer.
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void Flush();
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//! End the writing operation.
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//! \param begin The begin write pointer returned by PutBegin().
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//! \return Number of characters written.
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size_t PutEnd(Ch* begin);
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}
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\endcode
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*/
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//! Provides additional information for stream.
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/*!
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By using traits pattern, this type provides a default configuration for stream.
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For custom stream, this type can be specialized for other configuration.
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See TEST(Reader, CustomStringStream) in readertest.cpp for example.
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*/
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template<typename Stream>
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struct StreamTraits {
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//! Whether to make local copy of stream for optimization during parsing.
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/*!
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By default, for safety, streams do not use local copy optimization.
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Stream that can be copied fast should specialize this, like StreamTraits<StringStream>.
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*/
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enum { copyOptimization = 0 };
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};
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//! Reserve n characters for writing to a stream.
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template<typename Stream>
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inline void PutReserve(Stream& stream, size_t count) {
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(void)stream;
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(void)count;
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}
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//! Write character to a stream, presuming buffer is reserved.
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template<typename Stream>
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inline void PutUnsafe(Stream& stream, typename Stream::Ch c) {
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stream.Put(c);
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}
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//! Put N copies of a character to a stream.
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template<typename Stream, typename Ch>
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inline void PutN(Stream& stream, Ch c, size_t n) {
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PutReserve(stream, n);
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for (size_t i = 0; i < n; i++)
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PutUnsafe(stream, c);
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}
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///////////////////////////////////////////////////////////////////////////////
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// StringStream
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//! Read-only string stream.
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/*! \note implements Stream concept
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*/
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template <typename Encoding>
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struct GenericStringStream {
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typedef typename Encoding::Ch Ch;
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GenericStringStream(const Ch *src) : src_(src), head_(src) {}
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Ch Peek() const { return *src_; }
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Ch Take() { return *src_++; }
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size_t Tell() const { return static_cast<size_t>(src_ - head_); }
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Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
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void Put(Ch) { RAPIDJSON_ASSERT(false); }
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void Flush() { RAPIDJSON_ASSERT(false); }
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size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }
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const Ch* src_; //!< Current read position.
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const Ch* head_; //!< Original head of the string.
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};
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template <typename Encoding>
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struct StreamTraits<GenericStringStream<Encoding> > {
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enum { copyOptimization = 1 };
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};
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//! String stream with UTF8 encoding.
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typedef GenericStringStream<UTF8<> > StringStream;
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///////////////////////////////////////////////////////////////////////////////
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// InsituStringStream
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//! A read-write string stream.
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/*! This string stream is particularly designed for in-situ parsing.
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\note implements Stream concept
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*/
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template <typename Encoding>
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struct GenericInsituStringStream {
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typedef typename Encoding::Ch Ch;
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GenericInsituStringStream(Ch *src) : src_(src), dst_(0), head_(src) {}
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// Read
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Ch Peek() { return *src_; }
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Ch Take() { return *src_++; }
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size_t Tell() { return static_cast<size_t>(src_ - head_); }
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// Write
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void Put(Ch c) { RAPIDJSON_ASSERT(dst_ != 0); *dst_++ = c; }
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Ch* PutBegin() { return dst_ = src_; }
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size_t PutEnd(Ch* begin) { return static_cast<size_t>(dst_ - begin); }
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void Flush() {}
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Ch* Push(size_t count) { Ch* begin = dst_; dst_ += count; return begin; }
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void Pop(size_t count) { dst_ -= count; }
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Ch* src_;
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Ch* dst_;
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Ch* head_;
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};
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template <typename Encoding>
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struct StreamTraits<GenericInsituStringStream<Encoding> > {
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enum { copyOptimization = 1 };
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};
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//! Insitu string stream with UTF8 encoding.
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typedef GenericInsituStringStream<UTF8<> > InsituStringStream;
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RAPIDJSON_NAMESPACE_END
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#endif // RAPIDJSON_STREAM_H_
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