172 lines
6.8 KiB
C++
172 lines
6.8 KiB
C++
/*=============================================================================
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Boost.Wave: A Standard compliant C++ preprocessor library
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Definition of the preprocessor context
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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(CPP_ITERATION_CONTEXT_HPP_00312288_9DDB_4668_AFE5_25D3994FD095_INCLUDED)
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#define CPP_ITERATION_CONTEXT_HPP_00312288_9DDB_4668_AFE5_25D3994FD095_INCLUDED
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#include <iterator>
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#include <fstream>
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#if defined(BOOST_NO_TEMPLATED_ITERATOR_CONSTRUCTORS)
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#include <sstream>
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#endif
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#include <boost/wave/wave_config.hpp>
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#include <boost/wave/cpp_exceptions.hpp>
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#include <boost/wave/language_support.hpp>
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#include <boost/wave/util/file_position.hpp>
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// #include <boost/spirit/include/iterator/classic_multi_pass.hpp> // make_multi_pass
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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 iteration_context_policies {
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///////////////////////////////////////////////////////////////////////////////
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//
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// The iteration_context_policies templates are policies for the
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// boost::wave::iteration_context which allows to control, how a given
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// input file is to be represented by a pair of iterators pointing to the
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// begin and the end of the resulting input sequence.
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//
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///////////////////////////////////////////////////////////////////////////////
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///////////////////////////////////////////////////////////////////////////
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//
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// load_file_to_string
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//
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// Loads a file into a string and returns the iterators pointing to
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// the beginning and the end of the loaded string.
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//
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///////////////////////////////////////////////////////////////////////////
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struct load_file_to_string
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{
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template <typename IterContextT>
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class inner
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{
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public:
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template <typename PositionT>
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static void init_iterators(IterContextT &iter_ctx,
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PositionT const &act_pos, language_support language)
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{
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typedef typename IterContextT::iterator_type iterator_type;
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// read in the file
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std::ifstream instream(iter_ctx.filename.c_str());
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if (!instream.is_open()) {
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BOOST_WAVE_THROW_CTX(iter_ctx.ctx, preprocess_exception,
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bad_include_file, iter_ctx.filename.c_str(), act_pos);
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return;
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}
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instream.unsetf(std::ios::skipws);
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iter_ctx.instring.assign(
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std::istreambuf_iterator<char>(instream.rdbuf()),
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std::istreambuf_iterator<char>());
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iter_ctx.first = iterator_type(
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iter_ctx.instring.begin(), iter_ctx.instring.end(),
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PositionT(iter_ctx.filename), language);
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iter_ctx.last = iterator_type();
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}
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private:
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std::string instring;
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};
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};
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} // namespace iteration_context_policies
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///////////////////////////////////////////////////////////////////////////////
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// Base class for iteration contexts
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template <typename ContextT, typename IteratorT>
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struct base_iteration_context
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{
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enum file_type
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{
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// this iteration context handles ...
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main_file, // ... the main preprocessed file
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system_header, // ... a header file included used #include <>
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user_header // ... a header file included using #include ""
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};
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base_iteration_context(ContextT& ctx_,
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BOOST_WAVE_STRINGTYPE const &fname, std::size_t if_block_depth = 0)
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: real_filename(fname), real_relative_filename(fname), filename(fname),
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line(1), emitted_lines(0), if_block_depth(if_block_depth), ctx(ctx_),
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type(main_file)
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{}
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base_iteration_context(ContextT& ctx_,
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IteratorT const &first_, IteratorT const &last_,
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BOOST_WAVE_STRINGTYPE const &fname, std::size_t if_block_depth = 0,
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file_type type_ = main_file)
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: first(first_), last(last_), real_filename(fname),
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real_relative_filename(fname), filename(fname),
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line(1), emitted_lines(0), if_block_depth(if_block_depth), ctx(ctx_),
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type(type_)
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{}
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// the actual input stream
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IteratorT first; // actual input stream position
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IteratorT last; // end of input stream
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BOOST_WAVE_STRINGTYPE real_filename; // real name of the current file
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BOOST_WAVE_STRINGTYPE real_relative_filename; // real relative name of the current file
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BOOST_WAVE_STRINGTYPE filename; // actual processed file
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std::size_t line; // line counter of underlying stream
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std::size_t emitted_lines; // count of emitted newlines
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std::size_t if_block_depth; // depth of #if block recursion
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ContextT& ctx; // corresponding context<> object
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file_type type; // the type of the handled file
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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template <
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typename ContextT, typename IteratorT,
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typename InputPolicyT = typename ContextT::input_policy_type
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>
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struct iteration_context
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: public base_iteration_context<ContextT, IteratorT>,
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public InputPolicyT::template
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inner<iteration_context<ContextT, IteratorT, InputPolicyT> >
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{
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typedef IteratorT iterator_type;
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typedef typename IteratorT::token_type::position_type position_type;
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typedef base_iteration_context<ContextT, IteratorT> base_type;
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typedef iteration_context<ContextT, IteratorT, InputPolicyT> self_type;
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iteration_context(ContextT& ctx, BOOST_WAVE_STRINGTYPE const &fname,
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position_type const &act_pos,
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boost::wave::language_support language_,
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typename base_type::file_type type = base_type::main_file)
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: base_iteration_context<ContextT, IteratorT>(ctx, fname, type)
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{
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InputPolicyT::template inner<self_type>::init_iterators(
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*this, act_pos, language_);
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}
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};
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///////////////////////////////////////////////////////////////////////////////
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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(CPP_ITERATION_CONTEXT_HPP_00312288_9DDB_4668_AFE5_25D3994FD095_INCLUDED)
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