#ifndef MSP_DATAFILE_LOADER_H_
#define MSP_DATAFILE_LOADER_H_
+#include <type_traits>
#include <map>
#include <msp/io/file.h>
#include "loaderaction.h"
+#include "meta.h"
#include "parser.h"
#include "statement.h"
See also classes ObjectLoader and CollectionObjectLoader in objectloader.h.
*/
-class Loader
+class Loader: private NonCopyable
{
-private:
- struct ActionKey
+protected:
+ class ActionMap: public std::map<StatementKey, LoaderAction *>, private NonCopyable
{
- std::string keyword;
- std::string signature;
-
- ActionKey(const std::string &, const std::string &);
-
- bool operator<(const ActionKey &) const;
+ public:
+ ~ActionMap();
};
- typedef std::map<ActionKey, LoaderAction *> ActionMap;
-
- ActionMap actions;
- const Statement *cur_st;
- bool sub_loaded;
+private:
+ ActionMap local_actions;
+ ActionMap *actions = nullptr;
+ Parser *cur_parser = nullptr;
+ unsigned cur_level = 0;
+ const Statement *cur_st = nullptr;
+ bool sub_loaded = false;
+ bool direct = false;
+ std::vector<Loader *> aux_loaders;
protected:
- bool check_sub_loads;
+ bool check_sub_loads = false;
- Loader();
+ Loader() = default;
public:
- virtual ~Loader();
+ virtual ~Loader() = default;
/** Loads statements from a parser. */
void load(Parser &p);
/** 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);
}
/** Loads a sub-object from the statement being processed with an extra
- parameter for the Loader. The Loader class of the sub-object is
+ arguments 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)
+ template<typename S, typename... Args>
+ void load_sub(S &s, Args &&... args)
{
- typename S::Loader ldr(s, p);
+ typename S::Loader ldr(s, std::forward<Args>(args)...);
load_sub_with(ldr);
}
/** 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)())
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... 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>
- void add(const std::string &k, void (L::*func)(A0, A1, A2, A3))
- { add(k, new LoaderFunc4<L, A0, A1, A2, A3>(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 std::remove_reference<B0>::type &b0)
+ { add(k, new LoaderFuncNBound1<L, B0, Args...>(func, b0)); }
- 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)); }
+ template<typename L, typename B0, typename... Args>
+ void add(const std::string &k, void (L::*func)(B0, Args...), B0 &&b0)
+ { add(k, new LoaderFuncNBound1<L, B0, Args...>(func, std::forward<B0>(b0))); }
/** Adds a keyword that is loaded into a member of the loaded object. */
template<typename L, typename T0>
/** Adds a keyword that is recognized but ignored. */
void add(const std::string &k)
- { add(k, 0); }
+ { add(k, nullptr); }
private:
void add(const std::string &, LoaderAction *);
- LoaderAction *find_action(const ActionKey &) const;
+protected:
+ void add_auxiliary_loader(Loader &);
+
+private:
+ bool has_action(const StatementKey &) const;
+ LoaderAction *find_action(const StatementKey &) const;
protected:
/** Returns the source of the statement being processed. This can be used
source may not necessarily be a file. */
const std::string &get_source() const;
+ /** Returns the keyword of the statement being processed. Can be used to
+ implement dynamic keywords. */
+ const std::string &get_keyword() const;
+
virtual void finish() { }
};
/**
-Loads an object from a file. The object must have a public Loader class.
+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 T>
-void load(T &obj, const std::string &fn)
+template<typename T, typename... Args>
+void load(T &obj, const std::string &fn, Args &&... args)
{
IO::BufferedFile in(fn);
Parser parser(in, fn);
- typename T::Loader loader(obj);
+ typename T::Loader loader(obj, std::forward<Args>(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 have a
+public Loader class. The collection is passed to the Loader constructor,
+followed by any extra arguments.
+*/
+template<typename T, typename... Args>
+void load(T &obj, typename T::Loader::Collection &coll, const std::string &fn, Args &&... args)
{
- IO::BufferedFile in(fn);
+ RefPtr<IO::Seekable> in = coll.open_raw(fn);
+ if(!in)
+ throw IO::file_not_found(fn);
- Parser parser(in, fn);
- typename T::Loader loader(obj, arg);
+ Parser parser(*in, fn);
+ typename T::Loader loader(obj, coll, std::forward<Args>(args)...);
+ loader.load(parser);
+}
+
+/**
+Loads an object from a file stored in a collection. The object must have a
+public Loader class. Any extra arguments are passed to the Loader constructor.
+*/
+template<typename T, typename C, typename... Args>
+typename std::enable_if<!NeedsCollection<typename T::Loader>::value>::type load(T &obj, C &coll, const std::string &fn, Args &&... args)
+{
+ RefPtr<IO::Seekable> in = coll.open_raw(fn);
+ if(!in)
+ throw IO::file_not_found(fn);
+
+ Parser parser(*in, fn);
+ typename T::Loader loader(obj, std::forward<Args>(args)...);
loader.load(parser);
}
projects / libs / datafile.git / blobdiff