Add reverse name lookup to Collection

[libs/datafile.git] / source / loader.h

diff --git a/source/loader.h b/source/loader.h
index 951eeb0d2337f9ce2793fabe294a674c915ac34e..5b39212e53c32beceda2cc3227109dc9eb4c9b6c 100644 (file)
--- a/source/loader.h
+++ b/source/loader.h
@@ -8,8 +8,9 @@ Distributed under the LGPL
 #ifndef MSP_DATAFILE_LOADER_H_
 #define MSP_DATAFILE_LOADER_H_
 
-#include <fstream>
 #include <map>
+#include <msp/io/buffered.h>
+#include <msp/io/file.h>
 #include "except.h"
 #include "parser.h"
 #include "statement.h"
@@ -301,37 +302,27 @@ protected:
        */
        template<typename S>
        void load_sub(S &s)
-       { load_sub<typename S::Loader, S>(s); }
-
-       /**
-       Loads a sub-object with a custom Loader class.
-       */
-       template<typename L, typename S>
-       void load_sub(S &s)
        {
-               if(!cur_st)
-                       throw InvalidState("load_sub called without current statement");
-               L loader(s);
-               loader.load(*cur_st);
+               typename S::Loader ldr(s);
+               load_sub_with(ldr);
        }
 
-       template<typename S, typename T>
-       void load_sub(S &s, T &p)
-       { load_sub<typename S::Loader, S, T>(s, p); }
-
        /**
-       Loads a sub-object with a custom Loader class that takes one argument in
-       addition to to object to be loaded.
+       Loads a sub-object from the statement being processed with an extra parameter
+       for the Loader.  The Loader class of the sub-object is automatically used.
        */
-       template<typename L, typename S, typename T>
+       template<typename S, typename T>
        void load_sub(S &s, T &p)
        {
-               if(!cur_st)
-                       throw InvalidState("load_sub called without current statement");
-               L loader(s, p);
-               loader.load(*cur_st);
+               typename S::Loader ldr(s, p);
+               load_sub_with(ldr);
        }
 
+       /**
+       Processes the current statement's substatements with another Loader.
+       */
+       void load_sub_with(Loader &);
+
        /**
        Returns the source of the statement being processed.  This can be used to
        implement relative paths in include-like statements.  Note that the source
@@ -343,6 +334,8 @@ protected:
                        throw InvalidState("get_source called without current statement");
                return cur_st->source;
        }
+
+       virtual void finish() { }
 private:
        typedef std::map<std::string, LoaderAction *> ActionMap;
 
@@ -359,21 +352,19 @@ Loads an object from a file.  The object must have a public Loader class.
 template<typename T>
 void load(T &obj, const std::string &fn)
 {
-       std::ifstream in(fn.c_str());
-       if(!in)
-               throw Exception("Couldn't open "+fn);
+       IO::File in(fn);
+       IO::Buffered buf(in);
 
-       Parser parser(in, fn);
+       Parser parser(buf, fn);
        typename T::Loader loader(obj);
        loader.load(parser);
 }
 
 template<typename T, typename U>
-void load(T &obj, const std::string &fn, U arg)
+void load(T &obj, const std::string &fn, U &arg)
 {
-       std::ifstream in(fn.c_str());
-       if(!in)
-               throw Exception("Couldn't open "+fn);
+       IO::File in(fn);
+       IO::Buffered buf(in);
 
        Parser parser(in, fn);
        typename T::Loader loader(obj, arg);