stream.h

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#ifndef STREAM_H_62B23520_7C8E_11DE_8A39_0800200C9A66_PM
#define STREAM_H_62B23520_7C8E_11DE_8A39_0800200C9A66_PM

#if defined(_MSC_VER) || (defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || (__GNUC__ >= 4)) // GCC supports "pragma once" correctly since 3.4
#pragma once
#endif


#include "yaml-cpp-pm/noncopyable.h"
#include "yaml-cpp-pm/mark.h"
#include <cstddef>
#include <deque>
#include <ios>
#include <iostream>
#include <set>
#include <string>

namespace YAML_PM
{
        class Stream: private noncopyable
        {
        public:
                friend class StreamCharSource;
                
                Stream(std::istream& input);
                ~Stream();

                operator bool() const;
                bool operator !() const { return !static_cast <bool>(*this); }

                char peek() const;
                char get();
                std::string get(int n);
                void eat(int n = 1);

                static char eof() { return 0x04; }
                
                const Mark mark() const { return m_mark; }
                int pos() const { return m_mark.pos; }
                int line() const { return m_mark.line; }
                int column() const { return m_mark.column; }
                void ResetColumn() { m_mark.column = 0; }

        private:
                enum CharacterSet {utf8, utf16le, utf16be, utf32le, utf32be};

                std::istream& m_input;
                Mark m_mark;
                
                CharacterSet m_charSet;
                mutable std::deque<char> m_readahead;
                unsigned char* const m_pPrefetched;
                mutable size_t m_nPrefetchedAvailable;
                mutable size_t m_nPrefetchedUsed;
                
                void AdvanceCurrent();
                char CharAt(size_t i) const;
                bool ReadAheadTo(size_t i) const;
                bool _ReadAheadTo(size_t i) const;
                void StreamInUtf8() const;
                void StreamInUtf16() const;
                void StreamInUtf32() const;
                unsigned char GetNextByte() const;
        };

        // CharAt
        // . Unchecked access
        inline char Stream::CharAt(size_t i) const {
                return m_readahead[i];
        }
        
        inline bool Stream::ReadAheadTo(size_t i) const {
                if(m_readahead.size() > i)
                        return true;
                return _ReadAheadTo(i);
        }       
}

#endif // STREAM_H_62B23520_7C8E_11DE_8A39_0800200C9A66_PM