source: XMLIO_V2/external/src/POCO/Foundation/TextIterator.cpp @ 80

//
// TextIterator.cpp
//
// $Id: //poco/1.3/Foundation/src/TextIterator.cpp#5 $
//
// Library: Foundation
// Package: Text
// Module:  TextIterator
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include <Poco/TextIterator.h>
#include <Poco/TextEncoding.h>
#include <algorithm>


namespace Poco {


TextIterator::TextIterator():
        _pEncoding(0)
{
}


TextIterator::TextIterator(const std::string& str, const TextEncoding& encoding):
        _pEncoding(&encoding),
        _it(str.begin()),
        _end(str.end())
{
}

TextIterator::TextIterator(const std::string::const_iterator& begin, const std::string::const_iterator& end, const TextEncoding& encoding):
        _pEncoding(&encoding),
        _it(begin),
        _end(end)
{
}


TextIterator::TextIterator(const std::string& str):
        _pEncoding(0),
        _it(str.end()),
        _end(str.end())
{
}


TextIterator::TextIterator(const std::string::const_iterator& end):
        _pEncoding(0),
        _it(end),
        _end(end)
{
}


TextIterator::~TextIterator()
{
}


TextIterator::TextIterator(const TextIterator& it):
        _pEncoding(it._pEncoding),
        _it(it._it),
        _end(it._end)
{
}


TextIterator& TextIterator::operator = (const TextIterator& it)
{
        if (&it != this)
        {
                _pEncoding = it._pEncoding;
                _it        = it._it;
                _end       = it._end;
        }
        return *this;
}


void TextIterator::swap(TextIterator& it)
{
        std::swap(_pEncoding, it._pEncoding);
        std::swap(_it, it._it);
        std::swap(_end, it._end);
}


int TextIterator::operator * () const
{
        poco_check_ptr (_pEncoding);
        poco_assert (_it != _end);
        std::string::const_iterator it = _it;
        
        unsigned char buffer[TextEncoding::MAX_SEQUENCE_LENGTH];
        unsigned char* p = buffer;

        if (it != _end)
                *p++ = *it++;
        else
                *p++ = 0;

        int read = 1;
        int n = _pEncoding->queryConvert(buffer, 1);

        while (-1 > n && (_end - it) >= -n - read)
        {
                while (read < -n && it != _end)
                { 
                        *p++ = *it++; 
                        read++; 
                }
                n = _pEncoding->queryConvert(buffer, read);
        }

        if (-1 > n)
        {
                return -1;
        }
        else
        {
                return n;
        }
}

        
TextIterator& TextIterator::operator ++ ()
{
        poco_check_ptr (_pEncoding);
        poco_assert (_it != _end);
        
        unsigned char buffer[TextEncoding::MAX_SEQUENCE_LENGTH];
        unsigned char* p = buffer;

        if (_it != _end)
                *p++ = *_it++;
        else
                *p++ = 0;

        int read = 1;
        int n = _pEncoding->sequenceLength(buffer, 1);

        while (-1 > n && (_end - _it) >= -n - read)
        {
                while (read < -n && _it != _end)
                { 
                        *p++ = *_it++; 
                        read++; 
                }
                n = _pEncoding->sequenceLength(buffer, read);
        }
        while (read < n && _it != _end)
        { 
                _it++; 
                read++; 
        }

        return *this;
}


TextIterator TextIterator::operator ++ (int)
{
        TextIterator prev(*this);
        operator ++ ();
        return prev;
}


} // namespace Poco