Rework module architecture

Now the target type and rule maps are in scopes (builtins -- in global
scope). We also now have the map of loaded modules in the root scope of
each project.

1 files changed, 6 insertions, 32 deletions

diff --git a/build/target-key b/build/target-key
index 54813b0..37fa6ab 100644
--- a/build/target-key
+++ b/build/target-key
@@ -5,45 +5,19 @@
 #ifndef BUILD_TARGET_KEY
 #define BUILD_TARGET_KEY
 
+#include <map>
 #include <string>
-#include <typeindex>
 #include <ostream>
+#include <typeindex>
+#include <functional>  // reference_wrapper
+
+#include <butl/utility> // compare_c_string
 
 #include <build/types>
+#include <build/target-type>
 
 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 std::ostream&
-  operator<< (std::ostream& os, const target_type& tt)
-  {
-    return os << tt.name;
-  }
-
   // Light-weight (by being shallow-pointing) target key.
   //
   class target_key