/*=============================================================================

    Boost.Wave: A Standard compliant C++ preprocessor library

    Definition of the preprocessor context

    http://www.boost.org/

    Copyright (c) 2001-2007 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(CPP_CONTEXT_HPP_907485E2_6649_4A87_911B_7F7225F3E5B8_INCLUDED)

#define CPP_CONTEXT_HPP_907485E2_6649_4A87_911B_7F7225F3E5B8_INCLUDED

#include <string>

#include <vector>

#include <stack>

#include <boost/concept_check.hpp>

#include <boost/noncopyable.hpp>

#include <boost/filesystem/path.hpp>

#include <boost/wave/wave_config.hpp>

#if BOOST_WAVE_SERIALIZATION != 0

#include <boost/serialization/serialization.hpp>

#include <boost/wave/wave_config_constant.hpp>

#endif

#include <boost/wave/token_ids.hpp>

#include <boost/wave/util/unput_queue_iterator.hpp>

#include <boost/wave/util/cpp_ifblock.hpp>

#include <boost/wave/util/cpp_include_paths.hpp>

#include <boost/wave/util/iteration_context.hpp>

#include <boost/wave/util/cpp_iterator.hpp>

#include <boost/wave/util/cpp_macromap.hpp>

#include <boost/wave/preprocessing_hooks.hpp>

#include <boost/wave/whitespace_handling.hpp>

#include <boost/wave/cpp_iteration_context.hpp>

#include <boost/wave/language_support.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 {

///////////////////////////////////////////////////////////////////////////////

// 

//  The C preprocessor context template class

//

//      The boost::wave::context template is the main interface class to 

//      control the behaviour of the preprocessing engine.

//

//      The following template parameters has to be supplied:

//

//      IteratorT       The iterator type of the underlying input stream

//      LexIteratorT    The lexer iterator type to use as the token factory

//      InputPolicyT    The input policy type to use for loading the files

//                      to be included. This template parameter is optional and 

//                      defaults to the 

//                          iteration_context_policies::load_file_to_string

//                      type.

//      HooksT          The hooks policy to use for different notification 

//                      callbacks. This template parameter is optional and

//                      defaults to the

//                          context_policies::default_preprocessing_hooks

//                      type.

//

///////////////////////////////////////////////////////////////////////////////

template <

    typename IteratorT,

    typename LexIteratorT, 

    typename InputPolicyT = iteration_context_policies::load_file_to_string,

    typename HooksT = context_policies::eat_whitespace<typename LexIteratorT::token_type>

>

class context : private boost::noncopyable

{

public:

// concept checks

// the given iterator shall be at least a forward iterator type

    BOOST_CLASS_REQUIRE(IteratorT, boost, ForwardIteratorConcept);

// public typedefs

    typedef typename LexIteratorT::token_type       token_type;

    typedef context<IteratorT, LexIteratorT, InputPolicyT, HooksT> 

        self_type;

    typedef IteratorT                               target_iterator_type;

    typedef LexIteratorT                            lexer_type;

    typedef pp_iterator<self_type>                  iterator_type;

    typedef InputPolicyT                            input_policy_type;

    typedef typename token_type::position_type      position_type;

// type of a token sequence

    typedef std::list<token_type, boost::fast_pool_allocator<token_type> > 

        token_sequence_type;

// types of the policies

    typedef HooksT                                  hook_policy_type;

private:

// stack of shared_ptr's to the pending iteration contexts 

    typedef boost::shared_ptr<base_iteration_context<lexer_type> > 

        iteration_ptr_type;

    typedef boost::wave::util::iteration_context_stack<iteration_ptr_type> 

            iteration_context_stack_type;

    typedef typename iteration_context_stack_type::size_type iter_size_type;

    context *this_() { return this; }           // avoid warning in constructor

public:

    context(target_iterator_type const &first_, target_iterator_type const &last_, 

            char const *fname = "<Unknown>", HooksT const &hooks_ = HooksT())

    :   first(first_), last(last_), filename(fname)

#if BOOST_WAVE_SUPPORT_PRAGMA_ONCE != 0

        , current_filename(fname)

#endif 

        , macros(*this_())

        , language(language_support(

                      support_cpp 

                    | support_option_convert_trigraphs 

                    | support_option_emit_line_directives 

#if BOOST_WAVE_SUPPORT_PRAGMA_ONCE != 0

                    | support_option_include_guard_detection

#endif

                   ))

        , hooks(hooks_)

    {

        macros.init_predefined_macros(fname);

        includes.init_initial_path();

    }

// default copy constructor

// default assignment operator

// default destructor

// iterator interface

    iterator_type begin() 

    { 

        std::string fname(filename);

        if (filename != "<Unknown>" && filename != "<stdin>") {

            using namespace boost::filesystem;

            path fpath(complete(path(filename)));

            fname = fpath.string();

            includes.set_current_directory(fname.c_str());

        }

        return iterator_type(*this, first, last, position_type(fname.c_str())); 

    }

    iterator_type begin(

        target_iterator_type const &first_, 

        target_iterator_type const &last_) 

    { 

        std::string fname(filename);

        if (filename != "<Unknown>" && filename != "<stdin>") {

            using namespace boost::filesystem;

            path fpath(complete(path(filename)));

            fname = fpath.string();

            includes.set_current_directory(fname.c_str());

        }

        return iterator_type(*this, first_, last_, position_type(fname.c_str())); 

    }

    iterator_type end() const 

        { return iterator_type(); }

// maintain include paths

    bool add_include_path(char const *path_)

        { return includes.add_include_path(path_, false);}

    bool add_sysinclude_path(char const *path_)

        { return includes.add_include_path(path_, true);}

    void set_sysinclude_delimiter() { includes.set_sys_include_delimiter(); }

    typename iteration_context_stack_type::size_type get_iteration_depth() const 

        { return iter_ctxs.size(); }

// maintain defined macros

#if BOOST_WAVE_ENABLE_COMMANDLINE_MACROS != 0

    bool add_macro_definition(std::string macrostring, 

            bool is_predefined = false)

        { return boost::wave::util::add_macro_definition(*this, macrostring, 

            is_predefined, get_language()); }

#endif 

    bool add_macro_definition(token_type const &name, bool has_params,

            std::vector<token_type> &parameters, token_sequence_type &definition,

            bool is_predefined = false)

        { return macros.add_macro(name, has_params, parameters, definition, 

            is_predefined); }

    template <typename IteratorT2>

    bool is_defined_macro(IteratorT2 const &begin, IteratorT2 const &end) 

        { return macros.is_defined(begin, end); }

    bool get_macro_definition(typename token_type::string_type const &name, 

            bool &has_params, bool &is_predefined, position_type &pos,

            std::vector<token_type> &parameters, token_sequence_type &definition)

        { 

            return macros.get_macro(name, has_params, is_predefined, pos,

                parameters, definition); 

        }

    bool remove_macro_definition(typename token_type::string_type const &name, 

            bool even_predefined = false)

        { 

#if BOOST_WAVE_SUPPORT_PRAGMA_ONCE != 0

            // ensure this gets remove from the list of include guards as well

            includes.remove_pragma_once_header(std::string(name.c_str()));

#endif

            return macros.remove_macro(

                token_type(T_IDENTIFIER, name, macros.get_main_pos()), 

                even_predefined); 

        }

    void reset_macro_definitions() 

        { macros.reset_macromap(); macros.init_predefined_macros(); }

// get the Wave version information 

    static std::string get_version()  

        { return boost::wave::util::predefined_macros::get_fullversion(false); }

    static std::string get_version_string()  

        { return boost::wave::util::predefined_macros::get_versionstr(false); }

// access current language options

    void set_language(boost::wave::language_support language_,

                      bool reset_macros = true) 

    { 

        language = language_; 

        if (reset_macros)

            reset_macro_definitions();

    }

    boost::wave::language_support get_language() const { return language; }

// change and ask for maximal possible include nesting depth

    void set_max_include_nesting_depth(iter_size_type new_depth)

        { iter_ctxs.set_max_include_nesting_depth(new_depth); }

    iter_size_type get_max_include_nesting_depth() const

        { return iter_ctxs.get_max_include_nesting_depth(); }

// access the policies

    hook_policy_type &get_hooks() { return hooks; }

// return the directory of the currently preprocessed file

    boost::filesystem::path get_current_directory() const

        { return includes.get_current_directory(); }

#if !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)

protected:

    friend class boost::wave::pp_iterator<

        boost::wave::context<IteratorT, lexer_type, InputPolicyT, HooksT> >;

    friend class boost::wave::impl::pp_iterator_functor<

        boost::wave::context<IteratorT, lexer_type, InputPolicyT, HooksT> >;

#endif

// maintain include paths (helper functions)

    bool find_include_file (std::string &s, std::string &d, bool is_system, 

        char const *current_file) const

    { return includes.find_include_file(s, d, is_system, current_file); }

    void set_current_directory(char const *path_) 

        { includes.set_current_directory(path_); }

// conditional compilation contexts

    bool get_if_block_status() const { return ifblocks.get_status(); }

    bool get_if_block_some_part_status() const 

        { return ifblocks.get_some_part_status(); } 

    bool get_enclosing_if_block_status() const

        { return ifblocks.get_enclosing_status(); }

    void enter_if_block(bool new_status) 

        { ifblocks.enter_if_block(new_status); }

    bool enter_elif_block(bool new_status) 

        { return ifblocks.enter_elif_block(new_status); }

    bool enter_else_block() { return ifblocks.enter_else_block(); }

    bool exit_if_block() { return ifblocks.exit_if_block(); }

    typename boost::wave::util::if_block_stack::size_type get_if_block_depth() const 

        { return ifblocks.get_if_block_depth(); }

// stack of iteration contexts

    iteration_ptr_type pop_iteration_context()

        { iteration_ptr_type top = iter_ctxs.top(); iter_ctxs.pop(); return top; }

    void push_iteration_context(position_type const &act_pos, iteration_ptr_type iter_ctx)

        { iter_ctxs.push(act_pos, iter_ctx); }

    position_type &get_main_pos() { return macros.get_main_pos(); }

///////////////////////////////////////////////////////////////////////////////

//

//  expand_tokensequence(): 

//      expands all macros contained in a given token sequence, handles '##' 

//      and '#' pp operators and re-scans the resulting sequence 

//      (essentially pre-processes the token sequence).

//

//      The expand_undefined parameter is true during macro expansion inside

//      a C++ expression given for a #if or #elif statement. 

//

///////////////////////////////////////////////////////////////////////////////

    template <typename IteratorT2>

    token_type expand_tokensequence(IteratorT2 &first_, IteratorT2 const &last_, 

        token_sequence_type &pending, token_sequence_type &expanded, 

        bool expand_undefined = false)

    {

        return macros.expand_tokensequence(first_, last_, pending, expanded, 

            expand_undefined);

    }

    template <typename IteratorT2>

    void expand_whole_tokensequence(IteratorT2 &first_, IteratorT2 const &last_, 

        token_sequence_type &expanded, bool expand_undefined = true)

    {

        macros.expand_whole_tokensequence(expanded, first_, last_, 

            expand_undefined);

    // remove any contained placeholder

        boost::wave::util::impl::remove_placeholders(expanded);

    }

public:

#if BOOST_WAVE_SUPPORT_PRAGMA_ONCE != 0

// support for #pragma once

// maintain the real name of the current preprocessed file

    void set_current_filename(char const *real_name)

        { current_filename = real_name; }

    std::string const &get_current_filename() const 

        { return current_filename; }

// maintain the list of known headers containing #pragma once 

    bool has_pragma_once(std::string const &filename_)

        { return includes.has_pragma_once(filename_); }

    bool add_pragma_once_header(std::string const &filename_,

            std::string const& guard_name = "__BOOST_WAVE_PRAGMA_ONCE__")

        { return includes.add_pragma_once_header(filename_, guard_name); }

#endif 

// forwarding functions for the context policy hooks    

    template <typename ContainerT>

    bool interpret_pragma(ContainerT &pending, token_type const &option, 

        ContainerT const &values, token_type const &act_token)

    {

        return hooks.interpret_pragma(*this, pending, option, values, act_token);

    }

#if BOOST_WAVE_SERIALIZATION != 0

public:

    BOOST_STATIC_CONSTANT(unsigned int, version = 0x10);

    BOOST_STATIC_CONSTANT(unsigned int, version_mask = 0x0f);

private:

    friend class boost::serialization::access;

    template<class Archive>

    void save(Archive & ar, const unsigned int version) const

    {

        typedef typename token_type::string_type string_type;

        string_type cfg(BOOST_PP_STRINGIZE(BOOST_WAVE_CONFIG));

        string_type kwd(BOOST_WAVE_PRAGMA_KEYWORD);

        string_type strtype(BOOST_PP_STRINGIZE((BOOST_WAVE_STRINGTYPE)));

        ar & cfg;

        ar & kwd;

        ar & strtype;

        ar & language;

        ar & macros;

        ar & includes;

    }

    template<class Archive>

    void load(Archive & ar, const unsigned int loaded_version)

    {

        if (version != (loaded_version & ~version_mask)) {

            BOOST_WAVE_THROW(preprocess_exception, incompatible_config, 

                "cpp_context state version", get_main_pos());

        }

        // check compatibility of the stored information

        typedef typename token_type::string_type string_type;

        string_type config, pragma_keyword, string_type_str;

        ar & config;          // BOOST_WAVE_CONFIG

        if (config != BOOST_PP_STRINGIZE(BOOST_WAVE_CONFIG)) {

            BOOST_WAVE_THROW(preprocess_exception, incompatible_config, 

                "BOOST_WAVE_CONFIG", get_main_pos());

        }

        ar & pragma_keyword;  // BOOST_WAVE_PRAGMA_KEYWORD

        if (pragma_keyword != BOOST_WAVE_PRAGMA_KEYWORD) {

            BOOST_WAVE_THROW(preprocess_exception, incompatible_config, 

                "BOOST_WAVE_PRAGMA_KEYWORD", get_main_pos());

        }

        ar & string_type_str; // BOOST_PP_STRINGIZE((BOOST_WAVE_STRINGTYPE))

        if (string_type_str != BOOST_PP_STRINGIZE((BOOST_WAVE_STRINGTYPE))) {

            BOOST_WAVE_THROW(preprocess_exception, incompatible_config, 

                "BOOST_WAVE_STRINGTYPE", get_main_pos());

        }

        // read in the useful bits

        ar & language;

        ar & macros;

        ar & includes;

    }

    BOOST_SERIALIZATION_SPLIT_MEMBER()

#endif

private:

// the main input stream

    target_iterator_type first;         // underlying input stream

    target_iterator_type last;

    std::string filename;               // associated main filename

#if BOOST_WAVE_SUPPORT_PRAGMA_ONCE != 0

    std::string current_filename;       // real name of current preprocessed file

#endif 

    boost::wave::util::if_block_stack ifblocks;   // conditional compilation contexts

    boost::wave::util::include_paths includes;    // lists of include directories to search

    iteration_context_stack_type iter_ctxs;       // iteration contexts

    boost::wave::util::macromap<self_type> macros;  // map of defined macros

    boost::wave::language_support language;       // supported language/extensions

    hook_policy_type hooks;                       // hook policy instance

};

///////////////////////////////////////////////////////////////////////////////

}   // namespace wave

}   // namespace boost

#if BOOST_WAVE_SERIALIZATION != 0

namespace boost { namespace serialization {

template<

    typename Iterator, typename LexIterator, 

    typename InputPolicy, typename Hooks

>

struct tracking_level<boost::wave::context<Iterator, LexIterator, InputPolicy, Hooks> >

{

    typedef mpl::integral_c_tag tag;

    typedef mpl::int_<track_never> type;

    BOOST_STATIC_CONSTANT(

        int,

        value = tracking_level::type::value

    );

};

template<

    typename Iterator, typename LexIterator, 

    typename InputPolicy, typename Hooks

>

struct version<boost::wave::context<Iterator, LexIterator, InputPolicy, Hooks> >

{

    typedef boost::wave::context<Iterator, LexIterator, InputPolicy, Hooks>

        target_type;

    typedef mpl::int_<target_type::version> type;

    typedef mpl::integral_c_tag tag;

    BOOST_STATIC_CONSTANT(unsigned int, value = version::type::value);

};

}}  // namespace boost::serialization

#endif

// the suffix header occurs after all of the code

#ifdef BOOST_HAS_ABI_HEADERS

#include BOOST_ABI_SUFFIX

#endif

#endif // !defined(CPP_CONTEXT_HPP_907485E2_6649_4A87_911B_7F7225F3E5B8_INCLUDED)