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/*=============================================================================
Boost.Wave: A Standard compliant C++ preprocessor library
Grammar for universal character validation (see C++ standard: Annex E)
http://www.boost.org/
Copyright (c) 2001-2011 Hartmut Kaiser. Distributed under 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)
=============================================================================*/
#if !defined(CONVERT_TRIGRAPHS_HK050403_INCLUDED)
#define CONVERT_TRIGRAPHS_HK050403_INCLUDED
#include <boost/wave/wave_config.hpp>
#include <boost/wave/cpplexer/cpplexer_exceptions.hpp>
// this must occur after all of the includes and before any code appears
#ifdef BOOST_HAS_ABI_HEADERS
#include BOOST_ABI_PREFIX
#endif
///////////////////////////////////////////////////////////////////////////////
namespace boost {
namespace wave {
namespace cpplexer {
namespace impl {
///////////////////////////////////////////////////////////////////////////////
//
// Test, whether the given string represents a valid trigraph sequence
//
///////////////////////////////////////////////////////////////////////////////
template <typename StringT>
inline bool
is_trigraph(StringT const& trigraph)
{
if (trigraph.size() < 3 || '?' != trigraph[0] || '?' != trigraph[1])
return false;
switch (trigraph[2]) {
case '\'': case '=': case '/': case '(':
case ')': case '<': case '>': case '!':
case '-':
break;
default:
return false;
}
return true;
}
///////////////////////////////////////////////////////////////////////////////
//
// convert_trigraph
//
// The function convert_trigraph() converts a single trigraph character
// sequence into the corresponding character.
//
// If the given character sequence doesn't form a valid trigraph sequence
// no conversion is performed.
//
///////////////////////////////////////////////////////////////////////////////
template <typename StringT>
inline StringT
convert_trigraph(StringT const &trigraph)
{
StringT result (trigraph);
if (is_trigraph(trigraph)) {
switch (trigraph[2]) {
case '\'': result = "^"; break;
case '=': result = "#"; break;
case '/': result = "\\"; break;
case '(': result = "["; break;
case ')': result = "]"; break;
case '<': result = "{"; break;
case '>': result = "}"; break;
case '!': result = "|"; break;
case '-': result = "~"; break;
}
}
return result;
}
///////////////////////////////////////////////////////////////////////////////
//
// convert_trigraphs
//
// The function convert_trigraph() converts all trigraphs in the given
// string into the corresponding characters.
//
// If one of the given character sequences doesn't form a valid trigraph
// sequence no conversion is performed.
//
///////////////////////////////////////////////////////////////////////////////
template <typename StringT>
inline StringT
convert_trigraphs(StringT const &value)
{
StringT result;
typename StringT::size_type pos = 0;
typename StringT::size_type pos1 = value.find_first_of ("?", 0);
if (StringT::npos != pos1) {
do {
result += value.substr(pos, pos1-pos);
StringT trigraph (value.substr(pos1));
if (is_trigraph(trigraph)) {
result += convert_trigraph(trigraph);
pos1 = value.find_first_of ("?", pos = pos1+3);
}
else {
result += value[pos1];
pos1 = value.find_first_of ("?", pos = pos1+1);
}
} while (StringT::npos != pos1);
result += value.substr(pos);
}
else {
result = value;
}
return result;
}
///////////////////////////////////////////////////////////////////////////////
} // namespace impl
} // namespace cpplexer
} // namespace wave
} // namespace boost
// the suffix header occurs after all of the code
#ifdef BOOST_HAS_ABI_HEADERS
#include BOOST_ABI_SUFFIX
#endif
#endif // !defined(CONVERT_TRIGRAPHS_HK050403_INCLUDED)
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