4 #include <simgear/misc/sg_path.hxx>
5 #include <simgear/structure/subsystem_mgr.hxx>
6 #include <simgear/misc/sg_dir.hxx>
7 #include <simgear/nasal/cppbind/NasalHash.hxx>
8 #include <simgear/nasal/nasal.h>
9 #include <simgear/threads/SGQueue.hxx>
10 #include <simgear/props/props.hxx>
12 // Required only for MSVC
14 # include <Scripting/NasalModelData.hxx>
21 class FGNasalListener;
23 class FGNasalModelData;
26 namespace simgear { class BufferedLogCallback; }
28 SGPropertyNode* ghostToPropNode(naRef ref);
29 SGCondition* conditionGhost(naRef r);
31 class FGNasalSys : public SGSubsystem
35 virtual ~FGNasalSys();
37 virtual void shutdown();
39 virtual void update(double dt);
41 // Loads a nasal script from an external file and inserts it as a
42 // global module of the specified name.
43 bool loadModule(SGPath file, const char* moduleName);
45 // Simple hook to run arbitrary source code. Returns a bool to
46 // indicate successful execution. Does *not* return any Nasal
47 // values, because handling garbage-collected objects from C space
48 // is deep voodoo and violates the "simple hook" idea.
49 bool parseAndRun(const char* sourceCode);
51 // Slightly more complicated hook to get a handle to a precompiled
52 // Nasal script that can be invoked via a call() method. The
53 // caller is expected to delete the FGNasalScript returned from
54 // this function. The "name" argument specifies the "file name"
55 // for the source code that will be printed in Nasal stack traces
57 // FGNasalScript* parseScript(const char* src, const char* name=0);
59 // Implementation of the settimer extension function
60 void setTimer(naContext c, int argc, naRef* args);
62 // Implementation of the setlistener extension function
63 naRef setListener(naContext c, int argc, naRef* args);
64 naRef removeListener(naContext c, int argc, naRef* args);
66 // Returns a ghost wrapper for the current _cmdArg
69 void setCmdArg(SGPropertyNode* aNode);
72 * create Nasal props.Node for an SGPropertyNode*
73 * This is the actual ghost, wrapped in a Nasal sugar class.
75 naRef wrappedPropsNode(SGPropertyNode* aProps);
77 // Callbacks for command and timer bindings
78 virtual bool handleCommand( const char* moduleName,
81 const SGPropertyNode* arg = 0 );
82 virtual bool handleCommand(const SGPropertyNode* arg);
84 bool createModule(const char* moduleName, const char* fileName,
85 const char* src, int len, const SGPropertyNode* cmdarg=0,
86 int argc=0, naRef*args=0);
88 void deleteModule(const char* moduleName);
90 void addCommand(naRef func, const std::string& name);
91 void removeCommand(const std::string& name);
94 * Set member of specified hash to given value
96 void hashset(naRef hash, const char* key, naRef val);
99 * Set member of globals hash to given value
101 void globalsSet(const char* key, naRef val);
103 naRef call(naRef code, int argc, naRef* args, naRef locals);
105 naRef callMethod(naRef code, naRef self, int argc, naRef* args, naRef locals);
107 naRef propNodeGhost(SGPropertyNode* handle);
109 void registerToLoad(FGNasalModelData* data);
110 void registerToUnload(FGNasalModelData* data);
112 // can't call this 'globals' due to naming clash
113 naRef nasalGlobals() const
116 nasal::Hash getGlobals() const
117 { return nasal::Hash(_globals, _context); }
119 // This mechanism is here to allow naRefs to be passed to
120 // locations "outside" the interpreter. Normally, such a
121 // reference would be garbage collected unexpectedly. By passing
122 // it to gcSave and getting a key/handle, it can be cached in a
123 // globals.__gcsave hash. Be sure to release it with gcRelease
126 void gcRelease(int key);
128 /// retrive the associated log object, for displaying log
129 /// output somewhere (a UI, presumably)
130 simgear::BufferedLogCallback* log() const
133 //friend class FGNasalScript;
134 friend class FGNasalListener;
135 friend class FGNasalModuleListener;
137 SGLockedQueue<SGSharedPtr<FGNasalModelData> > _loadList;
138 SGLockedQueue<SGSharedPtr<FGNasalModelData> > _unloadList;
140 // Delay removing items of the _loadList to ensure the are already attached
141 // to the scene graph (eg. enables to retrieve world position in load
146 // FGTimer subclass for handling Nasal timer callbacks.
147 // See the implementation of the settimer() extension function for
151 virtual void timerExpired();
152 virtual ~NasalTimer() {}
159 std::map<int, FGNasalListener *> _listener;
160 std::vector<FGNasalListener *> _dead_listener;
162 static int _listenerId;
164 void loadPropertyScripts();
165 void loadPropertyScripts(SGPropertyNode* n);
166 void loadScriptDirectory(simgear::Dir nasalDir);
167 void addModule(std::string moduleName, simgear::PathList scripts);
168 static void logError(naContext);
169 naRef parse(const char* filename, const char* buf, int len);
170 naRef genPropsModule();
176 SGPropertyNode_ptr _cmdArg;
178 simgear::BufferedLogCallback* _log;
180 typedef std::map<std::string, NasalCommand*> NasalCommandDict;
181 NasalCommandDict _commands;
183 naRef _wrappedNodeFunc;
185 void handleTimer(NasalTimer* t);
189 class FGNasalScript {
191 ~FGNasalScript() { _nas->gcRelease(_gcKey); }
195 naCall(_nas->_context, _code, 0, &n, naNil(), naNil());
196 return naGetError(_nas->_context) == 0;
199 FGNasalSys* sys() const { return _nas; }
201 friend class FGNasalSys;
208 #endif // __NASALSYS_HXX