4 #include <simgear/misc/sg_path.hxx>
5 #include <simgear/structure/subsystem_mgr.hxx>
6 #include <simgear/nasal/nasal.h>
7 #include <simgear/scene/model/modellib.hxx>
8 #include <simgear/xml/easyxml.hxx>
15 class FGNasalListener;
17 class FGNasalSys : public SGSubsystem
21 virtual ~FGNasalSys();
23 virtual void update(double dt);
25 // Loads a nasal script from an external file and inserts it as a
26 // global module of the specified name.
27 void loadModule(SGPath file, const char* moduleName);
29 // Simple hook to run arbitrary source code. Returns a bool to
30 // indicate successful execution. Does *not* return any Nasal
31 // values, because handling garbage-collected objects from C space
32 // is deep voodoo and violates the "simple hook" idea.
33 bool parseAndRun(const char* sourceCode);
35 // Slightly more complicated hook to get a handle to a precompiled
36 // Nasal script that can be invoked via a call() method. The
37 // caller is expected to delete the FGNasalScript returned from
38 // this function. The "name" argument specifies the "file name"
39 // for the source code that will be printed in Nasal stack traces
41 FGNasalScript* parseScript(const char* src, const char* name=0);
43 // Implementation of the settimer extension function
44 void setTimer(naContext c, int argc, naRef* args);
46 // Implementation of the setlistener extension function
47 naRef setListener(naContext c, int argc, naRef* args);
48 naRef removeListener(naContext c, int argc, naRef* args);
50 // Returns a ghost wrapper for the current _cmdArg
53 // Callbacks for command and timer bindings
54 virtual bool handleCommand(const SGPropertyNode* arg);
56 void createModule(const char* moduleName, const char* fileName,
57 const char* src, int len, const SGPropertyNode* cmdarg=0,
58 int argc=0, naRef*args=0);
60 void deleteModule(const char* moduleName);
62 naRef call(naRef code, int argc, naRef* args, naRef locals);
63 naRef propNodeGhost(SGPropertyNode* handle);
66 friend class FGNasalScript;
67 friend class FGNasalListener;
70 // FGTimer subclass for handling Nasal timer callbacks.
71 // See the implementation of the settimer() extension function for
75 virtual void timerExpired();
76 virtual ~NasalTimer() {}
83 map<int, FGNasalListener *> _listener;
84 vector<FGNasalListener *> _dead_listener;
85 static int _listenerId;
87 void loadPropertyScripts();
88 void hashset(naRef hash, const char* key, naRef val);
89 void logError(naContext);
90 naRef parse(const char* filename, const char* buf, int len);
91 naRef genPropsModule();
93 // This mechanism is here to allow naRefs to be passed to
94 // locations "outside" the interpreter. Normally, such a
95 // reference would be garbage collected unexpectedly. By passing
96 // it to gcSave and getting a key/handle, it can be cached in a
97 // globals.__gcsave hash. Be sure to release it with gcRelease
100 void gcRelease(int key);
105 SGPropertyNode_ptr _cmdArg;
111 public: void handleTimer(NasalTimer* t);
115 class FGNasalScript {
117 ~FGNasalScript() { _nas->gcRelease(_gcKey); }
121 naCall(_nas->_context, _code, 0, &n, naNil(), naNil());
122 return naGetError(_nas->_context) == 0;
126 friend class FGNasalSys;
133 class FGNasalListener : public SGPropertyChangeListener {
135 FGNasalListener(SGPropertyNode* node, naRef code, FGNasalSys* nasal,
136 int key, int id, int type);
138 virtual ~FGNasalListener();
139 virtual void valueChanged(SGPropertyNode* node);
140 virtual void childAdded(SGPropertyNode* parent, SGPropertyNode* child);
141 virtual void childRemoved(SGPropertyNode* parent, SGPropertyNode* child);
144 bool changed(SGPropertyNode* node);
145 void call(SGPropertyNode* which, naRef mode);
147 friend class FGNasalSys;
148 SGPropertyNode_ptr _node;
154 unsigned int _active;
163 class FGNasalModelData : public simgear::SGModelData {
165 FGNasalModelData(SGPropertyNode *root = 0) : _root(root), _unload(0) {}
167 void modelLoaded(const string& path, SGPropertyNode *prop, osg::Node *);
171 SGPropertyNode_ptr _root;
172 SGConstPropertyNode_ptr _unload;
176 class NasalXMLVisitor : public XMLVisitor {
178 NasalXMLVisitor(naContext c, int argc, naRef* args);
179 virtual ~NasalXMLVisitor() { naFreeContext(_c); }
181 virtual void startElement(const char* tag, const XMLAttributes& a);
182 virtual void endElement(const char* tag);
183 virtual void data(const char* str, int len);
184 virtual void pi(const char* target, const char* data);
187 void call(naRef func, int num, naRef a = naNil(), naRef b = naNil());
188 naRef make_string(const char* s, int n = -1);
191 naRef _start_element, _end_element, _data, _pi;
194 #endif // __NASALSYS_HXX