1 #ifndef BOOST_ARCHIVE_ITERATORS_XML_UNESCAPE_HPP 2 #define BOOST_ARCHIVE_ITERATORS_XML_UNESCAPE_HPP 3 4 // MS compatible compilers support #pragma once 5 #if defined(_MSC_VER) 6 # pragma once 7 #endif 8 9 /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 10 // xml_unescape.hpp 11 12 // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . 13 // Use, modification and distribution is subject to the Boost Software 14 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at 15 // http://www.boost.org/LICENSE_1_0.txt) 16 17 // See http://www.boost.org for updates, documentation, and revision history. 18 19 #include <boost/config.hpp> 20 #include <boost/detail/workaround.hpp> 21 #include <boost/assert.hpp> 22 23 #include <boost/serialization/throw_exception.hpp> 24 25 #include <boost/archive/iterators/unescape.hpp> 26 #include <boost/archive/iterators/dataflow_exception.hpp> 27 28 namespace boost { 29 namespace archive { 30 namespace iterators { 31 32 /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 33 // replace &??? xml escape sequences with the corresponding characters 34 template<class Base> 35 class xml_unescape 36 : public unescape<xml_unescape<Base>, Base> 37 { 38 friend class boost::iterator_core_access; 39 typedef xml_unescape<Base> this_t; 40 typedef unescape<this_t, Base> super_t; 41 typedef typename boost::iterator_reference<this_t> reference_type; 42 dereference() const43 reference_type dereference() const { 44 return unescape<xml_unescape<Base>, Base>::dereference(); 45 } 46 public: 47 // msvc versions prior to 14.0 crash with and ICE 48 #if BOOST_WORKAROUND(BOOST_MSVC, < 1900) 49 typedef int value_type; 50 #else 51 typedef typename super_t::value_type value_type; 52 #endif 53 54 void drain_residue(const char *literal); 55 value_type drain(); 56 57 template<class T> xml_unescape(T start)58 xml_unescape(T start) : 59 super_t(Base(static_cast< T >(start))) 60 {} 61 // intel 7.1 doesn't like default copy constructor xml_unescape(const xml_unescape & rhs)62 xml_unescape(const xml_unescape & rhs) : 63 super_t(rhs.base_reference()) 64 {} 65 }; 66 67 template<class Base> drain_residue(const char * literal)68void xml_unescape<Base>::drain_residue(const char * literal){ 69 do{ 70 if(* literal != * ++(this->base_reference())) 71 boost::serialization::throw_exception( 72 dataflow_exception( 73 dataflow_exception::invalid_xml_escape_sequence 74 ) 75 ); 76 } 77 while('\0' != * ++literal); 78 } 79 80 // note key constraint on this function is that can't "look ahead" any 81 // more than necessary into base iterator. Doing so would alter the base 82 // iterator refenence which would make subsequent iterator comparisons 83 // incorrect and thereby break the composiblity of iterators. 84 template<class Base> 85 typename xml_unescape<Base>::value_type 86 //int drain()87xml_unescape<Base>::drain(){ 88 value_type retval = * this->base_reference(); 89 if('&' != retval){ 90 return retval; 91 } 92 retval = * ++(this->base_reference()); 93 switch(retval){ 94 case 'l': // < 95 drain_residue("t;"); 96 retval = '<'; 97 break; 98 case 'g': // > 99 drain_residue("t;"); 100 retval = '>'; 101 break; 102 case 'a': 103 retval = * ++(this->base_reference()); 104 switch(retval){ 105 case 'p': // ' 106 drain_residue("os;"); 107 retval = '\''; 108 break; 109 case 'm': // & 110 drain_residue("p;"); 111 retval = '&'; 112 break; 113 } 114 break; 115 case 'q': 116 drain_residue("uot;"); 117 retval = '"'; 118 break; 119 } 120 return retval; 121 } 122 123 } // namespace iterators 124 } // namespace archive 125 } // namespace boost 126 127 #endif // BOOST_ARCHIVE_ITERATORS_XML_UNESCAPE_HPP 128