Add reverse name lookup to Collection

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

diff --git a/source/loader.h b/source/loader.h
index 8d26a418a0f5d9cdec52a6ecc85160ff4ee1c4e4..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"
@@ -151,6 +152,23 @@ private:
 };
 
 
+template<typename L, typename A0, typename A1, typename A2, typename A3, typename A4>
+class LoaderFunc5: public LoaderAction
+{
+public:
+       typedef void (L::*FuncType)(A0, A1, A2, A3, A4);
+
+       LoaderFunc5(FuncType f): func(f) { }
+       void execute(Loader &l, const Statement &st) const
+       {
+               if(st.args.size()!=5) throw TypeError(st.get_location()+": Wrong number of arguments");
+               (dynamic_cast<L &>(l).*func)(st.args[0].get<A0>(), st.args[1].get<A1>(), st.args[2].get<A2>(), st.args[3].get<A3>(), st.args[4].get<A4>());
+       }
+private:
+       FuncType func;
+};
+
+
 template<typename L, typename T0>
 class LoadValue1: public LoaderAction
 {
@@ -179,7 +197,7 @@ public:
        {
                if(st.args.size()!=1) throw TypeError(st.get_location()+": Wrong number of arguments");
                typename L::Loader &ldr=dynamic_cast<typename L::Loader &>(l);
-               ldr.get_object().*ptr0=&ldr.get_collection().template get<T0>(st.args[0].get<std::string>());
+               ldr.get_object().*ptr0=ldr.get_collection().template get<T0>(st.args[0].get<std::string>());
        }
 private:
        Pointer0Type ptr0;
@@ -257,6 +275,10 @@ protected:
        void add(const std::string &k, void (L::*func)(A0, A1, A2, A3))
        { add(k, new LoaderFunc4<L, A0, A1, A2, A3>(func)); }
 
+       template<typename L, typename A0, typename A1, typename A2, typename A3, typename A4>
+       void add(const std::string &k, void (L::*func)(A0, A1, A2, A3, A4))
+       { add(k, new LoaderFunc5<L, A0, A1, A2, A3, A4>(func)); }
+
        /**
        Adds a keyword that is loaded into a variable of the loaded object.
        */
@@ -280,37 +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
@@ -322,6 +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;
 
@@ -338,21 +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);