X-Git-Url: http://git.tdb.fi/?p=libs%2Fdatafile.git;a=blobdiff_plain;f=source%2Floaderaction.h;h=c7c593829a1b24a3ccd161dad400f14b06d207e8;hp=ff478ec2df7aa8ed651914922516781e3f519278;hb=9c95942d24a92abea14bb9e11d33daae2d017321;hpb=db9c49893c2a9475cb5efa4a53bc481a5f66231f

diff --git a/source/loaderaction.h b/source/loaderaction.h
index ff478ec..c7c5938 100644
--- a/source/loaderaction.h
+++ b/source/loaderaction.h
@@ -1,19 +1,21 @@
-/* $Id$
-
-This file is part of libmspdatafile
-Copyright © 2006-2008  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
 #ifndef MSP_DATAFILE_LOADERACTION_H_
 #define MSP_DATAFILE_LOADERACTION_H_
 
-#include "except.h"
+#include <msp/core/meta.h>
+#include "argumentstore.h"
 #include "statement.h"
 
 namespace Msp {
 namespace DataFile {
 
+template<typename T>
+std::string create_signature(const std::string &prefix = std::string())
+{ return prefix+std::string(1, TypeInfo<T>::signature); }
+
+template<typename T0, typename T1, typename... Tail>
+std::string create_signature(const std::string &prefix = std::string())
+{ return create_signature<T1, Tail...>(prefix+std::string(1, TypeInfo<T0>::signature)); }
+
 class Loader;
 
 /**
@@ -21,14 +23,17 @@ Base class for loader actions.
 */
 class LoaderAction
 {
-public:
-	/**
-	Called when a statement is to be loaded.
-	*/
-	virtual void execute(Loader &, const Statement &) const=0;
-	virtual ~LoaderAction() { }
 protected:
 	LoaderAction() { }
+public:
+	virtual ~LoaderAction() { }
+
+	/** Called to process a statement. */
+	virtual void execute(Loader &, const Statement &) const = 0;
+
+	virtual void execute(Loader &, const ArgumentStore &) const = 0;
+
+	virtual std::string get_signature() const = 0;
 };
 
 
@@ -38,17 +43,26 @@ Loads a statement by calling a function that takes no arguments.
 template<typename L>
 class LoaderFunc0: public LoaderAction
 {
-public:
+private:
 	typedef void (L::*FuncType)();
 
+	FuncType func;
+
+public:
 	LoaderFunc0(FuncType f): func(f) { }
-	void execute(Loader &l, const Statement &st) const
+
+	virtual void execute(Loader &l, const Statement &) const
 	{
-		if(st.args.size()!=0) throw TypeError("Wrong number of arguments");
 		(dynamic_cast<L &>(l).*func)();
 	};
-private:
-	FuncType func;
+
+	virtual void execute(Loader &l, const ArgumentStore &) const
+	{
+		(dynamic_cast<L &>(l).*func)();
+	};
+
+	virtual std::string get_signature() const
+	{ return std::string(); }
 };
 
 
@@ -58,17 +72,26 @@ Loads a statement by calling a function that takes one argument.
 template<typename L, typename A0>
 class LoaderFunc1: public LoaderAction
 {
-public:
+private:
 	typedef void (L::*FuncType)(A0);
 
+	FuncType func;
+
+public:
 	LoaderFunc1(FuncType f): func(f) { }
-	void execute(Loader &l, const Statement &st) const
+
+	virtual void execute(Loader &l, const Statement &st) const
 	{
-		if(st.args.size()!=1) throw TypeError("Wrong number of arguments");
 		(dynamic_cast<L &>(l).*func)(st.args[0].get<A0>());
 	}
-private:
-	FuncType func;
+
+	virtual void execute(Loader &l, const ArgumentStore &as) const
+	{
+		(dynamic_cast<L &>(l).*func)(as.get<A0>(0));
+	}
+
+	virtual std::string get_signature() const
+	{ return std::string(1, TypeInfo<A0>::signature); }
 };
 
 
@@ -78,20 +101,40 @@ Loads a statement by calling a function that takes an array of values.
 template<typename L, typename A0>
 class LoaderFunc1<L, const std::vector<A0> &>: public LoaderAction
 {
-public:
+private:
 	typedef void (L::*FuncType)(const std::vector<A0> &);
 
+	FuncType func;
+
+public:
 	LoaderFunc1(FuncType f): func(f) { }
-	void execute(Loader &l, const Statement &st) const
+
+	virtual void execute(Loader &l, const Statement &st) const
 	{
 		std::vector<A0> values;
 		values.reserve(st.args.size());
-		for(ValueArray::const_iterator i=st.args.begin(); i!=st.args.end(); ++i)
+		for(Statement::Arguments::const_iterator i=st.args.begin(); i!=st.args.end(); ++i)
 			values.push_back(i->get<A0>());
 		(dynamic_cast<L &>(l).*func)(values);
 	}
-private:
-	FuncType func;
+
+	virtual void execute(Loader &l, const ArgumentStore &as) const
+	{
+		std::vector<A0> values;
+		unsigned n_args = as.get_info().key.signature.size();
+		values.reserve(n_args);
+		for(unsigned i=0; i<n_args; ++i)
+			values.push_back(as.get<A0>(i));
+		(dynamic_cast<L &>(l).*func)(values);
+	}
+
+	virtual std::string get_signature() const
+	{
+		std::string result;
+		result += TypeInfo<A0>::signature;
+		result += '*';
+		return result;
+	}
 };
 
 
@@ -101,139 +144,205 @@ Loads a statement by calling a function with the statement itself as argument.
 template<typename L>
 class LoaderFunc1<L, const Statement &>: public LoaderAction
 {
-public:
+private:
 	typedef void (L::*FuncType)(const Statement &);
 
+	FuncType func;
+
+public:
 	LoaderFunc1(FuncType f): func(f) { }
-	void execute(Loader &l, const Statement &st) const
+
+	virtual void execute(Loader &l, const Statement &st) const
 	{
 		(dynamic_cast<L &>(l).*func)(st);
 	}
-private:
-	FuncType func;
+
+	virtual void execute(Loader &, const ArgumentStore &) const
+	{
+		throw std::logic_error("incompatible format");
+	}
+
+	virtual std::string get_signature() const
+	{ return "*"; }
 };
 
 
-template<typename L, typename A0, typename A1>
-class LoaderFunc2: public LoaderAction
+template<unsigned I, typename... Args>
+struct Apply;
+
+template<unsigned I>
+struct Apply<I>
 {
-public:
-	typedef void (L::*FuncType)(A0, A1);
+	template<typename L, typename F, typename... Args>
+	static void apply(L &l, F func, const Statement &, Args... args)
+	{
+		(l.*func)(args...);
+	}
 
-	LoaderFunc2(FuncType f): func(f) { }
-	void execute(Loader &l, const Statement &st) const
+	template<typename L, typename F, typename... Args>
+	static void apply(L &l, F func, const ArgumentStore &, Args... args)
 	{
-		if(st.args.size()!=2) throw TypeError("Wrong number of arguments");
-		(dynamic_cast<L &>(l).*func)(st.args[0].get<A0>(), st.args[1].get<A1>());
+		(l.*func)(args...);
 	}
-private:
-	FuncType func;
 };
 
-
-template<typename L, typename A0, typename A1, typename A2>
-class LoaderFunc3: public LoaderAction
+template<unsigned I, typename Head, typename... Tail>
+struct Apply<I, Head, Tail...>
 {
-public:
-	typedef void (L::*FuncType)(A0, A1, A2);
+	template<typename L, typename F, typename... Args>
+	static void apply(L &l, F func, const Statement &st, Args... args)
+	{
+		Apply<I+1, Tail...>::apply(l, func, st, args..., st.args[I].get<Head>());
+	}
 
-	LoaderFunc3(FuncType f): func(f) { }
-	void execute(Loader &l, const Statement &st) const
+	template<typename L, typename F, typename... Args>
+	static void apply(L &l, F func, const ArgumentStore &as, Args... args)
 	{
-		if(st.args.size()!=3) throw TypeError("Wrong number of arguments");
-		(dynamic_cast<L &>(l).*func)(st.args[0].get<A0>(), st.args[1].get<A1>(), st.args[2].get<A2>());
+		Apply<I+1, Tail...>::apply(l, func, as, args..., as.get<Head>(I));
 	}
-private:
-	FuncType func;
 };
 
 
-template<typename L, typename A0, typename A1, typename A2, typename A3>
-class LoaderFunc4: public LoaderAction
+template<typename L, typename... Args>
+class LoaderFuncN: public LoaderAction
 {
+protected:
+	typedef void (L::*FuncType)(Args...);
+
+	FuncType func;
+
 public:
-	typedef void (L::*FuncType)(A0, A1, A2, A3);
+	LoaderFuncN(FuncType f): func(f) { }
 
-	LoaderFunc4(FuncType f): func(f) { }
-	void execute(Loader &l, const Statement &st) const
+	virtual void execute(Loader &l, const Statement &st) const
 	{
-		if(st.args.size()!=4) throw TypeError("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>());
+		Apply<0, Args...>::apply(dynamic_cast<L &>(l), func, st);
 	}
-private:
-	FuncType func;
+
+	virtual void execute(Loader &l, const ArgumentStore &as) const
+	{
+		Apply<0, Args...>::apply(dynamic_cast<L &>(l), func, as);
+	}
+
+	virtual std::string get_signature() const
+	{ return create_signature<Args...>(); }
 };
 
 
-template<typename L, typename A0, typename A1, typename A2, typename A3, typename A4>
-class LoaderFunc5: public LoaderAction
+template<typename L, typename B0, typename... Args>
+class LoaderFuncNBound1: public LoaderAction
 {
+protected:
+	typedef void (L::*FuncType)(B0, Args...);
+	typedef typename RemoveReference<B0>::Type Bound0Type;
+
+	FuncType func;
+	Bound0Type bound0;
+
 public:
-	typedef void (L::*FuncType)(A0, A1, A2, A3, A4);
+	LoaderFuncNBound1(FuncType f, const Bound0Type &b0): func(f), bound0(b0) { }
 
-	LoaderFunc5(FuncType f): func(f) { }
-	void execute(Loader &l, const Statement &st) const
+	virtual void execute(Loader &l, const Statement &st) const
 	{
-		if(st.args.size()!=5) throw TypeError("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>());
+		Apply<0, Args...>::apply(dynamic_cast<L &>(l), func, st, bound0);
 	}
-private:
-	FuncType func;
+
+	virtual void execute(Loader &l, const ArgumentStore &as) const
+	{
+		Apply<0, Args...>::apply(dynamic_cast<L &>(l), func, as, bound0);
+	}
+
+	virtual std::string get_signature() const
+	{ return create_signature<Args...>(); }
 };
 
 
 template<typename L, typename T0>
 class LoadValue1: public LoaderAction
 {
-public:
+private:
 	typedef T0 L::*Pointer0Type;
 
+	Pointer0Type ptr0;
+
+public:
 	LoadValue1(Pointer0Type p0): ptr0(p0) { }
-	void execute(Loader &l, const Statement &st) const
+
+	virtual void execute(Loader &l, const Statement &st) const
 	{
-		if(st.args.size()!=1) throw TypeError("Wrong number of arguments");
-		dynamic_cast<typename L::Loader &>(l).get_object().*ptr0=st.args[0].get<T0>();
+		dynamic_cast<typename L::Loader &>(l).get_object().*ptr0 = st.args[0].get<T0>();
 	}
-private:
-	Pointer0Type ptr0;
+
+	virtual void execute(Loader &l, const ArgumentStore &as) const
+	{
+		dynamic_cast<typename L::Loader &>(l).get_object().*ptr0 = as.get<T0>(0);
+	}
+
+	virtual std::string get_signature() const
+	{ return std::string(1, TypeInfo<T0>::signature); }
 };
 
 
 template<typename L, typename T0>
 class LoadValue1<L, T0 *>: public LoaderAction
 {
-public:
+private:
 	typedef T0 *L::*Pointer0Type;
 
+	Pointer0Type ptr0;
+
+public:
 	LoadValue1(Pointer0Type p0): ptr0(p0) { }
-	void execute(Loader &l, const Statement &st) const
+
+	virtual void execute(Loader &l, const Statement &st) const
 	{
-		if(st.args.size()!=1) throw TypeError("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>());
+		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>());
 	}
-private:
-	Pointer0Type ptr0;
+
+	virtual void execute(Loader &l, const ArgumentStore &as) const
+	{
+		typename L::Loader &ldr = dynamic_cast<typename L::Loader &>(l);
+		ldr.get_object().*ptr0 = &ldr.get_collection().template get<T0>(as.get<std::string>(0));
+	}
+
+	virtual std::string get_signature() const
+	{ return std::string(1, TypeInfo<std::string>::signature); }
 };
 
 
 template<typename L, typename T0, typename T1>
 class LoadValue2: public LoaderAction
 {
-public:
+private:
 	typedef T0 L::*Pointer0Type;
 	typedef T1 L::*Pointer1Type;
 
+	Pointer0Type ptr0;
+	Pointer1Type ptr1;
+
+public:
 	LoadValue2(Pointer0Type p0, Pointer1Type p1): ptr0(p0), ptr1(p1) { }
-	void execute(Loader &l, const Statement &st) const
+
+	virtual void execute(Loader &l, const Statement &st) const
 	{
-		if(st.args.size()!=2) throw TypeError("Wrong number of arguments");
-		dynamic_cast<typename L::Loader &>(l).get_object().*ptr0=st.args[0].get<T0>();
-		dynamic_cast<typename L::Loader &>(l).get_object().*ptr1=st.args[1].get<T1>();
+		dynamic_cast<typename L::Loader &>(l).get_object().*ptr0 = st.args[0].get<T0>();
+		dynamic_cast<typename L::Loader &>(l).get_object().*ptr1 = st.args[1].get<T1>();
+	}
+
+	virtual void execute(Loader &l, const ArgumentStore &as) const
+	{
+		dynamic_cast<typename L::Loader &>(l).get_object().*ptr0 = as.get<T0>(0);
+		dynamic_cast<typename L::Loader &>(l).get_object().*ptr1 = as.get<T1>(1);
+	}
+
+	virtual std::string get_signature() const
+	{
+		std::string result;
+		result += TypeInfo<T0>::signature;
+		result += TypeInfo<T1>::signature;
+		return result;
 	}
-private:
-	Pointer0Type ptr0;
-	Pointer1Type ptr1;
 };
 
 } // namespace DataFile