// file      : build/target-type -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license   : MIT; see accompanying LICENSE file

#ifndef BUILD_TARGET_TYPE
#define BUILD_TARGET_TYPE

#include <map>
#include <string>
#include <ostream>
#include <typeindex>
#include <functional>  // reference_wrapper

#include <butl/utility> // compare_c_string

#include <build/types>

namespace build
{
  class scope;
  class target;
  class target_key;
  class prerequisite_key;

  // Target type.
  //
  struct target_type
  {
    std::type_index id;
    const char* name;
    const target_type* base;
    target* (*const factory) (dir_path, std::string, const std::string*);
    const std::string& (*const extension) (const target_key&, scope&);
    target* (*const search) (const prerequisite_key&);
    bool see_through; // A group with the default "see through" semantics.

    bool
    is_a (const std::type_index&) const; // Defined in target.cxx

    template <typename T>
    bool
    is_a () const {return is_a (typeid (T));}
  };

  inline bool
  operator< (const target_type& x, const target_type& y)
  {
    return x.id < y.id;
  }

  inline std::ostream&
  operator<< (std::ostream& os, const target_type& tt)
  {
    return os << tt.name;
  }

  // Target type map.
  //
  using target_type_map_base = std::map<
    const char*,
    std::reference_wrapper<const target_type>,
    butl::compare_c_string>;

  class target_type_map: public target_type_map_base
  {
  public:
    void
    insert (const target_type& tt) {emplace (tt.name, tt);}

    template <typename T>
    void
    insert () {insert (T::static_type);}
  };
}

#endif // BUILD_TARGET_TYPE