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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_emit_custom_line_directives_HOOKS_INCLUDED)
- #define BOOST_WAVE_emit_custom_line_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 emit_custom_line_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 emit_custom_line_directives_hooks
- : public boost::wave::context_policies::default_preprocessing_hooks
- {
- public:
- ///////////////////////////////////////////////////////////////////////////
- //
- // The function 'emit_line_directive' is called whenever a #line directive
- // has to be emitted into the generated output.
- //
- // The parameter 'ctx' is a reference to the context object used for
- // instantiating the preprocessing iterators by the user.
- //
- // The parameter 'pending' may be used to push tokens back into the input
- // stream, which are to be used instead of the default output generated
- // for the #line directive.
- //
- // The parameter 'act_token' contains the actual #pragma token, which may
- // be used for error output. The line number stored in this token can be
- // used as the line number emitted as part of the #line directive.
- //
- // If the return value is 'false', a default #line directive is emitted
- // by the library. A return value of 'true' will inhibit any further
- // actions, the tokens contained in 'pending' will be copied verbatim
- // to the output.
- //
- ///////////////////////////////////////////////////////////////////////////
- template <typename ContextT, typename ContainerT>
- bool
- emit_line_directive(ContextT const& ctx, ContainerT &pending,
- typename ContextT::token_type const& act_token)
- {
- // emit a #line directive showing the relative filename instead
- typename ContextT::position_type pos = act_token.get_position();
- unsigned int column = 1;
- typedef typename ContextT::token_type result_type;
- using namespace boost::wave;
- pos.set_column(column);
- pending.push_back(result_type(T_POUND, "#", pos));
- pos.set_column(++column); // account for '#'
- pending.push_back(result_type(T_SPACE, " ", pos));
- // 21 is the max required size for a 64 bit integer represented as a
- // string
- char buffer[22];
- using namespace std; // for some systems sprintf is in namespace std
- sprintf (buffer, "%d", pos.get_line());
- pos.set_column(++column); // account for ' '
- pending.push_back(result_type(T_INTLIT, buffer, pos));
- pos.set_column(column += (unsigned int)strlen(buffer)); // account for <number>
- pending.push_back(result_type(T_SPACE, " ", pos));
- pos.set_column(++column); // account for ' '
- std::string file("\"");
- boost::filesystem::path filename(
- boost::wave::util::create_path(ctx.get_current_relative_filename().c_str()));
- using boost::wave::util::impl::escape_lit;
- file += escape_lit(boost::wave::util::native_file_string(filename)) + "\"";
- pending.push_back(result_type(T_STRINGLIT, file.c_str(), pos));
- pos.set_column(column += (unsigned int)file.size()); // account for filename
- pending.push_back(result_type(T_GENERATEDNEWLINE, "\n", pos));
- return true;
- }
- };
- #endif // !defined(BOOST_WAVE_ADVANCED_PREPROCESSING_HOOKS_INCLUDED)
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