140 lines
4.3 KiB
C++
140 lines
4.3 KiB
C++
/*=============================================================================
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Boost.Wave: A Standard compliant C++ preprocessor library
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Grammar for universal character validation (see C++ standard: Annex E)
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http://www.boost.org/
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Copyright (c) 2001-2012 Hartmut Kaiser. Distributed under the Boost
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Software License, Version 1.0. (See accompanying file
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LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#if !defined(CONVERT_TRIGRAPHS_HK050403_INCLUDED)
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#define CONVERT_TRIGRAPHS_HK050403_INCLUDED
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#include <boost/wave/wave_config.hpp>
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#include <boost/wave/cpplexer/cpplexer_exceptions.hpp>
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// this must occur after all of the includes and before any code appears
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#ifdef BOOST_HAS_ABI_HEADERS
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#include BOOST_ABI_PREFIX
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#endif
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///////////////////////////////////////////////////////////////////////////////
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namespace boost {
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namespace wave {
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namespace cpplexer {
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namespace impl {
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///////////////////////////////////////////////////////////////////////////////
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//
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// Test, whether the given string represents a valid trigraph sequence
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename StringT>
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inline bool
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is_trigraph(StringT const& trigraph)
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{
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if (trigraph.size() < 3 || '?' != trigraph[0] || '?' != trigraph[1])
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return false;
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switch (trigraph[2]) {
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case '\'': case '=': case '/': case '(':
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case ')': case '<': case '>': case '!':
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case '-':
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break;
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default:
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return false;
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}
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return true;
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// convert_trigraph
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//
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// The function convert_trigraph() converts a single trigraph character
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// sequence into the corresponding character.
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//
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// If the given character sequence doesn't form a valid trigraph sequence
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// no conversion is performed.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename StringT>
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inline StringT
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convert_trigraph(StringT const &trigraph)
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{
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StringT result (trigraph);
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if (is_trigraph(trigraph)) {
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switch (trigraph[2]) {
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case '\'': result = "^"; break;
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case '=': result = "#"; break;
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case '/': result = "\\"; break;
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case '(': result = "["; break;
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case ')': result = "]"; break;
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case '<': result = "{"; break;
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case '>': result = "}"; break;
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case '!': result = "|"; break;
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case '-': result = "~"; break;
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}
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}
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return result;
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// convert_trigraphs
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//
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// The function convert_trigraph() converts all trigraphs in the given
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// string into the corresponding characters.
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//
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// If one of the given character sequences doesn't form a valid trigraph
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// sequence no conversion is performed.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename StringT>
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inline StringT
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convert_trigraphs(StringT const &value)
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{
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StringT result;
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typename StringT::size_type pos = 0;
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typename StringT::size_type pos1 = value.find_first_of ("?", 0);
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if (StringT::npos != pos1) {
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do {
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result += value.substr(pos, pos1-pos);
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StringT trigraph (value.substr(pos1));
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if (is_trigraph(trigraph)) {
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result += convert_trigraph(trigraph);
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pos1 = value.find_first_of ("?", pos = pos1+3);
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}
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else {
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result += value[pos1];
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pos1 = value.find_first_of ("?", pos = pos1+1);
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}
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} while (StringT::npos != pos1);
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result += value.substr(pos);
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}
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else {
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result = value;
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}
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return result;
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}
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///////////////////////////////////////////////////////////////////////////////
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} // namespace impl
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} // namespace cpplexer
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} // namespace wave
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} // namespace boost
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// the suffix header occurs after all of the code
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#ifdef BOOST_HAS_ABI_HEADERS
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#include BOOST_ABI_SUFFIX
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#endif
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#endif // !defined(CONVERT_TRIGRAPHS_HK050403_INCLUDED)
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