#include <simgear/misc/sg_path.hxx>
#include <simgear/structure/subsystem_mgr.hxx>
#include <simgear/nasal/nasal.h>
+#include <simgear/scene/model/model.hxx>
+
+#include <map>
+SG_USING_STD(map);
+
+
+class FGNasalScript;
+class FGNasalListener;
class FGNasalSys : public SGSubsystem
{
virtual void init();
virtual void update(double dt) { /* noop */ }
- virtual bool handleCommand(const SGPropertyNode* arg);
+ // Loads a nasal script from an external file and inserts it as a
+ // global module of the specified name.
+ void loadModule(SGPath file, const char* moduleName);
// Simple hook to run arbitrary source code. Returns a bool to
// indicate successful execution. Does *not* return any Nasal
// is deep voodoo and violates the "simple hook" idea.
bool parseAndRun(const char* sourceCode);
+ // Slightly more complicated hook to get a handle to a precompiled
+ // Nasal script that can be invoked via a call() method. The
+ // caller is expected to delete the FGNasalScript returned from
+ // this function. The "name" argument specifies the "file name"
+ // for the source code that will be printed in Nasal stack traces
+ // on error.
+ FGNasalScript* parseScript(const char* src, const char* name=0);
+
// Implementation of the settimer extension function
- void setTimer(naRef args);
+ void setTimer(int argc, naRef* args);
+
+ // Implementation of the setlistener extension function
+ naRef setListener(int argc, naRef* args);
+ naRef removeListener(int argc, naRef* args);
// Returns a ghost wrapper for the current _cmdArg
naRef cmdArgGhost();
-
+
+ // Callbacks for command and timer bindings
+ virtual bool handleCommand(const SGPropertyNode* arg);
+
+ void createModule(const char* moduleName, const char* fileName,
+ const char* src, int len);
+
+ void deleteModule(const char* moduleName);
+
private:
+ friend class FGNasalScript;
+ friend class FGNasalListener;
+
//
// FGTimer subclass for handling Nasal timer callbacks.
// See the implementation of the settimer() extension function for
struct NasalTimer {
virtual void timerExpired();
naRef handler;
- int hashKey;
+ int gcKey;
FGNasalSys* nasal;
};
+ // Listener
+ map<int, FGNasalListener *> _listener;
+ static int _listenerId;
+
void loadPropertyScripts();
- void initModule(const char* moduleName, const char* fileName,
- const char* src, int len);
- void readScriptFile(SGPath file, const char* lib);
void hashset(naRef hash, const char* key, naRef val);
- void logError();
+ void logError(naContext);
naRef parse(const char* filename, const char* buf, int len);
naRef genPropsModule();
naRef propNodeGhost(SGPropertyNode* handle);
+ // This mechanism is here to allow naRefs to be passed to
+ // locations "outside" the interpreter. Normally, such a
+ // reference would be garbage collected unexpectedly. By passing
+ // it to gcSave and getting a key/handle, it can be cached in a
+ // globals.__gcsave hash. Be sure to release it with gcRelease
+ // when done.
+ int gcSave(naRef r);
+ void gcRelease(int key);
+
naContext _context;
naRef _globals;
- naRef _timerHash;
SGPropertyNode* _cmdArg;
- int _nextTimerHashKey;
+ int _nextGCKey;
+ naRef _gcHash;
+
+ public: void handleTimer(NasalTimer* t);
+};
+
+class FGNasalScript {
public:
- void handleTimer(NasalTimer* t);
+ ~FGNasalScript() { _nas->gcRelease(_gcKey); }
+
+ bool call() {
+ naRef n = naNil();
+ naCall(_nas->_context, _code, 0, &n, naNil(), naNil());
+ return naGetError(_nas->_context) == 0;
+ }
+
+private:
+ friend class FGNasalSys;
+ naRef _code;
+ int _gcKey;
+ FGNasalSys* _nas;
+};
+
+
+class FGNasalListener : public SGPropertyChangeListener {
+public:
+ FGNasalListener(SGPropertyNode_ptr node, naRef handler,
+ FGNasalSys* nasal, int key);
+
+ ~FGNasalListener();
+ void valueChanged(SGPropertyNode* node);
+
+private:
+ friend class FGNasalSys;
+ SGPropertyNode_ptr _node;
+ naRef _handler;
+ int _gcKey;
+ FGNasalSys* _nas;
+ unsigned int _active;
+};
+
+
+class FGNasalModelData : public SGModelData {
+public:
+ FGNasalModelData() : _unload(0) {}
+ ~FGNasalModelData();
+ void modelLoaded(const string& path, SGPropertyNode *prop, ssgBranch *);
+
+private:
+ string _module;
+ SGConstPropertyNode_ptr _unload;
};
#endif // __NASALSYS_HXX