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- /*=============================================================================
- Boost.Wave: A Standard compliant C++ preprocessor library
- http://www.boost.org/
- Copyright (c) 2001-2012 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(BOOST_WAVE_CUSTOM_DIRECTIVES_HOOKS_INCLUDED)
- #define BOOST_WAVE_CUSTOM_DIRECTIVES_HOOKS_INCLUDED
- #include <cstdio>
- #include <ostream>
- #include <string>
- #include <algorithm>
- #include <boost/assert.hpp>
- #include <boost/config.hpp>
- #include <boost/wave/token_ids.hpp>
- #include <boost/wave/util/macro_helpers.hpp>
- #include <boost/wave/preprocessing_hooks.hpp>
- ///////////////////////////////////////////////////////////////////////////////
- //
- // The custom_directives_hooks policy class is used to register some
- // of the more advanced (and probably more rarely used hooks with the Wave
- // library.
- //
- // This policy type is used as a template parameter to the boost::wave::context<>
- // object.
- //
- ///////////////////////////////////////////////////////////////////////////////
- class custom_directives_hooks
- : public boost::wave::context_policies::default_preprocessing_hooks
- {
- public:
- ///////////////////////////////////////////////////////////////////////////
- //
- // The function 'found_unknown_directive' is called, whenever an unknown
- // preprocessor directive was encountered.
- //
- // The parameter 'ctx' is a reference to the context object used for
- // instantiating the preprocessing iterators by the user.
- //
- // The parameter 'line' holds the tokens of the entire source line
- // containing the unknown directive.
- //
- // The parameter 'pending' may be used to push tokens back into the input
- // stream, which are to be used as the replacement text for the whole
- // line containing the unknown directive.
- //
- // The return value defines, whether the given expression has been
- // properly interpreted by the hook function or not. If this function
- // returns 'false', the library will raise an 'ill_formed_directive'
- // preprocess_exception. Otherwise the tokens pushed back into 'pending'
- // are passed on to the user program.
- //
- ///////////////////////////////////////////////////////////////////////////
- template <typename ContextT, typename ContainerT>
- bool
- found_unknown_directive(ContextT const& ctx, ContainerT const& line,
- ContainerT& pending)
- {
- namespace wave = boost::wave;
- typedef typename ContainerT::const_iterator iterator_type;
- iterator_type it = line.begin();
- wave::token_id id = wave::util::impl::skip_whitespace(it, line.end());
- if (id != wave::T_IDENTIFIER)
- return false; // nothing we could do
- if ((*it).get_value() == "version" || (*it).get_value() == "extension")
- {
- // handle #version and #extension directives
- std::copy(line.begin(), line.end(), std::back_inserter(pending));
- return true;
- }
- return false; // unknown directive
- }
- };
- #endif // !defined(BOOST_WAVE_ADVANCED_PREPROCESSING_HOOKS_INCLUDED)
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