chromium/third_party/angle/third_party/rapidjson/src/include/rapidjson/stream.h

// 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.
//
// 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.

#include "rapidjson.h"

#ifndef RAPIDJSON_STREAM_H_
#define RAPIDJSON_STREAM_H_

#include "encodings.h"

RAPIDJSON_NAMESPACE_BEGIN

///////////////////////////////////////////////////////////////////////////////
//  Stream

/*! \class rapidjson::Stream
    \brief Concept for reading and writing characters.

    For read-only stream, no need to implement PutBegin(), Put(), Flush() and PutEnd().

    For write-only stream, only need to implement Put() and Flush().

\code
concept Stream {
    typename Ch;    //!< Character type of the stream.

    //! Read the current character from stream without moving the read cursor.
    Ch Peek() const;

    //! Read the current character from stream and moving the read cursor to next character.
    Ch Take();

    //! Get the current read cursor.
    //! \return Number of characters read from start.
    size_t Tell();

    //! Begin writing operation at the current read pointer.
    //! \return The begin writer pointer.
    Ch* PutBegin();

    //! Write a character.
    void Put(Ch c);

    //! Flush the buffer.
    void Flush();

    //! End the writing operation.
    //! \param begin The begin write pointer returned by PutBegin().
    //! \return Number of characters written.
    size_t PutEnd(Ch* begin);
}
\endcode
*/

//! Provides additional information for stream.
/*!
    By using traits pattern, this type provides a default configuration for stream.
    For custom stream, this type can be specialized for other configuration.
    See TEST(Reader, CustomStringStream) in readertest.cpp for example.
*/
template<typename Stream>
struct StreamTraits { … };

//! Reserve n characters for writing to a stream.
template<typename Stream>
inline void PutReserve(Stream& stream, size_t count) { … }

//! Write character to a stream, presuming buffer is reserved.
template<typename Stream>
inline void PutUnsafe(Stream& stream, typename Stream::Ch c) { … }

//! Put N copies of a character to a stream.
template<typename Stream, typename Ch>
inline void PutN(Stream& stream, Ch c, size_t n) { … }

///////////////////////////////////////////////////////////////////////////////
// GenericStreamWrapper

//! A Stream Wrapper
/*! \tThis string stream is a wrapper for any stream by just forwarding any
    \treceived message to the origin stream.
    \note implements Stream concept
*/

#if defined(_MSC_VER) && _MSC_VER <= 1800
RAPIDJSON_DIAG_PUSH
RAPIDJSON_DIAG_OFF(4702)  // unreachable code
RAPIDJSON_DIAG_OFF(4512)  // assignment operator could not be generated
#endif

template <typename InputStream, typename Encoding = UTF8<> >
class GenericStreamWrapper { … };

#if defined(_MSC_VER) && _MSC_VER <= 1800
RAPIDJSON_DIAG_POP
#endif

///////////////////////////////////////////////////////////////////////////////
// StringStream

//! Read-only string stream.
/*! \note implements Stream concept
*/
template <typename Encoding>
struct GenericStringStream { … };

StreamTraits<GenericStringStream<Encoding>>;

//! String stream with UTF8 encoding.
StringStream;

///////////////////////////////////////////////////////////////////////////////
// InsituStringStream

//! A read-write string stream.
/*! This string stream is particularly designed for in-situ parsing.
    \note implements Stream concept
*/
template <typename Encoding>
struct GenericInsituStringStream { … };

StreamTraits<GenericInsituStringStream<Encoding>>;

//! Insitu string stream with UTF8 encoding.
InsituStringStream;

RAPIDJSON_NAMESPACE_END

#endif // RAPIDJSON_STREAM_H_