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#ifndef BOOST_ARCHIVE_ITERATORS_XML_UNESCAPE_HPP
#define BOOST_ARCHIVE_ITERATORS_XML_UNESCAPE_HPP
// MS compatible compilers support #pragma once
#if defined(_MSC_VER)
# pragma once
#endif
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// xml_unescape.hpp
// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org for updates, documentation, and revision history.
#include <boost/assert.hpp>
#include <boost/serialization/throw_exception.hpp>
#include <boost/serialization/pfto.hpp>
#include <boost/archive/iterators/unescape.hpp>
#include <boost/archive/iterators/dataflow_exception.hpp>
namespace boost {
namespace archive {
namespace iterators {
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// replace &??? xml escape sequences with the corresponding characters
template<class Base>
class xml_unescape
: public unescape<xml_unescape<Base>, Base>
{
friend class boost::iterator_core_access;
typedef xml_unescape<Base> this_t;
typedef unescape<this_t, Base> super_t;
typedef typename boost::iterator_reference<this_t> reference_type;
reference_type dereference() const {
return unescape<xml_unescape<Base>, Base>::dereference();
}
public:
// workaround msvc 7.1 ICU crash
#if defined(BOOST_MSVC)
typedef int value_type;
#else
typedef typename this_t::value_type value_type;
#endif
void drain_residue(const char *literal);
value_type drain();
template<class T>
xml_unescape(BOOST_PFTO_WRAPPER(T) start) :
super_t(Base(BOOST_MAKE_PFTO_WRAPPER(static_cast< T >(start))))
{}
// intel 7.1 doesn't like default copy constructor
xml_unescape(const xml_unescape & rhs) :
super_t(rhs.base_reference())
{}
};
template<class Base>
void xml_unescape<Base>::drain_residue(const char * literal){
do{
if(* literal != * ++(this->base_reference()))
boost::serialization::throw_exception(
dataflow_exception(
dataflow_exception::invalid_xml_escape_sequence
)
);
}
while('\0' != * ++literal);
}
// note key constraint on this function is that can't "look ahead" any
// more than necessary into base iterator. Doing so would alter the base
// iterator refenence which would make subsequent iterator comparisons
// incorrect and thereby break the composiblity of iterators.
template<class Base>
typename xml_unescape<Base>::value_type
//int
xml_unescape<Base>::drain(){
value_type retval = * this->base_reference();
if('&' != retval){
return retval;
}
retval = * ++(this->base_reference());
switch(retval){
case 'l': // <
drain_residue("t;");
retval = '<';
break;
case 'g': // >
drain_residue("t;");
retval = '>';
break;
case 'a':
retval = * ++(this->base_reference());
switch(retval){
case 'p': // '
drain_residue("os;");
retval = '\'';
break;
case 'm': // &
drain_residue("p;");
retval = '&';
break;
}
break;
case 'q':
drain_residue("uot;");
retval = '"';
break;
}
return retval;
}
} // namespace iterators
} // namespace archive
} // namespace boost
#endif // BOOST_ARCHIVE_ITERATORS_XML_UNESCAPE_HPP
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