-/* $Id$
-
-This file is part of libmspdatafile
-Copyright © 2006-2008 Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
#ifndef MSP_DATAFILE_LOADER_H_
#define MSP_DATAFILE_LOADER_H_
#include <map>
-#include <msp/io/buffered.h>
#include <msp/io/file.h>
-#include "except.h"
#include "loaderaction.h"
+#include "meta.h"
#include "parser.h"
#include "statement.h"
called. Any post-processing of the data should be placed here and not in the
destructor.
-See also classes BasicLoader and BasicLoader2.
+See also classes ObjectLoader and CollectionObjectLoader in objectloader.h.
*/
-class Loader
+class Loader: private NonCopyable
{
+protected:
+ class ActionMap: public std::map<StatementKey, LoaderAction *>, private NonCopyable
+ {
+ public:
+ ~ActionMap();
+ };
+
+private:
+ ActionMap local_actions;
+ ActionMap *actions;
+ Parser *cur_parser;
+ unsigned cur_level;
+ const Statement *cur_st;
+ bool sub_loaded;
+ bool direct;
+ std::vector<Loader *> aux_loaders;
+protected:
+ bool check_sub_loads;
+
+ Loader();
public:
- /**
- Loads data from a statement. This is normally only used by the Loader class
- itself for loading sub-items, but needs to be public so it can be accessed
- in derived objects.
- */
- void load(const Statement &st);
+ virtual ~Loader() { }
- /**
- Loads statements from a parser.
- */
+ /** Loads statements from a parser. */
void load(Parser &p);
- virtual ~Loader();
+private:
+ /** Loads data from a statement. */
+ void load(const Statement &st);
+
+ /** Loads statemsnts from a parser, feeding them directly to actions. */
+ void load_direct(Parser &, unsigned);
+
+ /** Processes a single statement */
+ void load_statement(const Statement &st);
+
protected:
- Loader(): cur_st(0) { }
+ /** Loads a sub-object from the statement being processed. The Loader class
+ of the sub-object is automatically used. */
+ template<typename S>
+ void load_sub(S &s)
+ {
+ typename S::Loader ldr(s);
+ load_sub_with(ldr);
+ }
+
+ /** 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 S, typename T>
+ void load_sub(S &s, T &p)
+ {
+ typename S::Loader ldr(s, p);
+ load_sub_with(ldr);
+ }
- /**
- Adds a keyword that is loaded with a zero-argument function.
- */
+ /** Processes the current statement's substatements with another Loader. */
+ void load_sub_with(Loader &);
+
+ /** Sets the actions to be used when loading. If the map is empty,
+ init_actions will be called. */
+ void set_actions(ActionMap &);
+ virtual void init_actions() { }
+
+ /** Adds a keyword that is loaded by calling a function. */
template<typename L>
void add(const std::string &k, void (L::*func)())
{ add(k, new LoaderFunc0<L>(func)); }
void add(const std::string &k, void (L::*func)(A0))
{ add(k, new LoaderFunc1<L, A0>(func)); }
- template<typename L, typename A0, typename A1>
- void add(const std::string &k, void (L::*func)(A0, A1))
- { add(k, new LoaderFunc2<L, A0, A1>(func)); }
-
- template<typename L, typename A0, typename A1, typename A2>
- void add(const std::string &k, void (L::*func)(A0, A1, A2))
- { add(k, new LoaderFunc3<L, A0, A1, A2>(func)); }
-
- template<typename L, typename A0, typename A1, typename A2, typename A3>
- 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... Args>
+ void add(const std::string &k, void (L::*func)(Args...))
+ { add(k, new LoaderFuncN<L, Args...>(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 by calling a function with a bound
+ first argument. */
+ template<typename L, typename B0, typename... Args>
+ void add(const std::string &k, void (L::*func)(B0, Args...), const typename RemoveReference<B0>::Type &b0)
+ { add(k, new LoaderFuncNBound1<L, B0, Args...>(func, b0)); }
- /**
- Adds a keyword that is loaded into a variable of the loaded object.
- */
+ /** Adds a keyword that is loaded into a member of the loaded object. */
template<typename L, typename T0>
void add(const std::string &k, T0 L::*p0)
{ add(k, new LoadValue1<L, T0>(p0)); }
void add(const std::string &k, T0 L::*p0, T1 L::*p1)
{ add(k, new LoadValue2<L, T0, T1>(p0, p1)); }
- /**
- Adds a keyword that is recognized but ignored.
- */
+ /** Adds a keyword that is recognized but ignored. */
void add(const std::string &k)
{ add(k, 0); }
- /**
- Loads a sub-object from the statement being processed. The Loader class of
- the sub-object is automatically used.
- */
- template<typename S>
- void load_sub(S &s)
- {
- typename S::Loader ldr(s);
- load_sub_with(ldr);
- }
-
- /**
- 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 S, typename T>
- void load_sub(S &s, T &p)
- {
- 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
- may not necessarily be a file.
- */
- const std::string &get_source() const
- {
- if(!cur_st)
- throw InvalidState("get_source called without current statement");
- return cur_st->source;
- }
-
- virtual void finish() { }
private:
- typedef std::map<std::string, LoaderAction *> ActionMap;
-
- ActionMap actions;
- const Statement *cur_st;
-
void add(const std::string &, LoaderAction *);
- void load_statement(const Statement &st);
-};
+protected:
+ void add_auxiliary_loader(Loader &);
-/**
-Provides the basic functionality of an object loader. Deriving from this
-allows loading values directly into member variables of the objects.
-*/
-template<typename O>
-class BasicLoader: public Loader
-{
-public:
- typedef O Object;
+private:
+ bool has_action(const StatementKey &) const;
+ LoaderAction *find_action(const StatementKey &) const;
protected:
- O &obj;
+ /** Returns the source of the statement being processed. This can be used
+ to implement relative paths in include-like statements. Note that the
+ source may not necessarily be a file. */
+ const std::string &get_source() const;
-public:
- BasicLoader(O &o): obj(o) { }
- O &get_object() const { return obj; }
+ /** Returns the keyword of the statement being processed. Can be used to
+ implement dynamic keywords. */
+ const std::string &get_keyword() const;
+
+ virtual void finish() { }
};
/**
-Provides functionality for loading objects with a Collection. Deriving from
-this allows loading pointers to objects in the collection automatically.
+Loads an object from a file. The object must have a public Loader class. Any
+extra arguments are passed to the Loader constructor.
*/
-template<typename O, typename C>
-class BasicLoader2: public BasicLoader<O>
+template<typename T, typename... Args>
+void load(T &obj, const std::string &fn, Args &... args)
{
-public:
- typedef C Collection;
-
-protected:
- C &coll;
-
-public:
- BasicLoader2(O &o, C &c): BasicLoader<O>(o), coll(c) { }
- C &get_collection() const { return coll; }
-};
+ IO::BufferedFile in(fn);
+ Parser parser(in, fn);
+ typename T::Loader loader(obj, args...);
+ loader.load(parser);
+}
/**
-Loads an object from a file. The object must have a public Loader class.
+Loads an object from a file stored in a collection. The object must have a
+public Loader class. The collection is passed to the Loader constructor,
+followed by any extra arguments.
*/
-template<typename T>
-void load(T &obj, const std::string &fn)
+template<typename T, typename... Args>
+void load(T &obj, typename T::Loader::Collection &coll, const std::string &fn, Args &... args)
{
- IO::File in(fn);
- IO::Buffered buf(in);
+ RefPtr<IO::Seekable> in = coll.open_raw(fn);
+ if(!in)
+ throw IO::file_not_found(fn);
- Parser parser(buf, fn);
- typename T::Loader loader(obj);
+ Parser parser(*in, fn);
+ typename T::Loader loader(obj, coll, args...);
loader.load(parser);
}
-template<typename T, typename U>
-void load(T &obj, const std::string &fn, U &arg)
+/**
+Loads an object from a file stored in a collection. The object must havea
+public Loader class. Any extra arguments are passed to the Loader constructor.
+*/
+template<typename T, typename C, typename... Args>
+typename EnableIf<NeedsCollection<typename T::Loader>::value, void>::No load(T &obj, C &coll, const std::string &fn, Args &... args)
{
- IO::File in(fn);
- IO::Buffered buf(in);
+ RefPtr<IO::Seekable> in = coll.open_raw(fn);
+ if(!in)
+ throw IO::file_not_found(fn);
- Parser parser(buf, fn);
- typename T::Loader loader(obj, arg);
+ Parser parser(*in, fn);
+ typename T::Loader loader(obj, args...);
loader.load(parser);
}
projects / libs / datafile.git / blobdiff