10 #ifdef HAVE_SYS_TIME_H
11 # include <sys/time.h> // gettimeofday
16 #include <sys/types.h>
21 #include <simgear/nasal/nasal.h>
22 #include <simgear/props/props.hxx>
23 #include <simgear/math/sg_random.h>
24 #include <simgear/misc/sg_path.hxx>
25 #include <simgear/misc/sg_dir.hxx>
26 #include <simgear/structure/commands.hxx>
27 #include <simgear/math/sg_geodesy.hxx>
28 #include <simgear/structure/event_mgr.hxx>
29 #include <simgear/debug/BufferedLogCallback.hxx>
31 #include <simgear/nasal/cppbind/from_nasal.hxx>
32 #include <simgear/nasal/cppbind/to_nasal.hxx>
33 #include <simgear/nasal/cppbind/Ghost.hxx>
34 #include <simgear/nasal/cppbind/NasalHash.hxx>
36 #include "NasalSGPath.hxx"
37 #include "NasalSys.hxx"
38 #include "NasalSys_private.hxx"
39 #include "NasalModelData.hxx"
40 #include "NasalPositioned.hxx"
41 #include "NasalCanvas.hxx"
42 #include "NasalClipboard.hxx"
43 #include "NasalCondition.hxx"
44 #include "NasalHTTP.hxx"
45 #include "NasalString.hxx"
47 #include <Main/globals.hxx>
48 #include <Main/util.hxx>
49 #include <Main/fg_props.hxx>
55 void postinitNasalGUI(naRef globals, naContext c);
57 static FGNasalSys* nasalSys = 0;
59 // Listener class for loading Nasal modules on demand
60 class FGNasalModuleListener : public SGPropertyChangeListener
63 FGNasalModuleListener(SGPropertyNode* node);
65 virtual void valueChanged(SGPropertyNode* node);
68 SGPropertyNode_ptr _node;
71 FGNasalModuleListener::FGNasalModuleListener(SGPropertyNode* node) : _node(node)
75 void FGNasalModuleListener::valueChanged(SGPropertyNode*)
77 if (_node->getBoolValue("enabled",false)&&
78 !_node->getBoolValue("loaded",true))
80 nasalSys->loadPropertyScripts(_node);
84 //////////////////////////////////////////////////////////////////////////
87 class TimerObj : public SGReferenced
90 TimerObj(FGNasalSys* sys, naRef f, naRef self, double interval) :
99 snprintf(nm, 128, "nasal-timer-%p", this);
101 _gcRoot = sys->gcSave(f);
102 _gcSelf = sys->gcSave(self);
108 _sys->gcRelease(_gcRoot);
109 _sys->gcRelease(_gcSelf);
112 bool isRunning() const { return _isRunning; }
117 globals->get_event_mgr()->removeTask(_name);
130 globals->get_event_mgr()->addEvent(_name, this, &TimerObj::invoke, _interval);
132 globals->get_event_mgr()->addTask(_name, this, &TimerObj::invoke,
133 _interval, _interval /* delay */);
137 // stop and then start -
138 void restart(double newInterval)
140 _interval = newInterval;
148 _sys->callMethod(_func, _self, 0, args, naNil() /* locals */);
154 void setSingleShot(bool aSingleShot)
156 _singleShot = aSingleShot;
159 bool isSingleShot() const
160 { return _singleShot; }
165 int _gcRoot, _gcSelf;
171 typedef SGSharedPtr<TimerObj> TimerObjRef;
172 typedef nasal::Ghost<TimerObjRef> NasalTimerObj;
174 ///////////////////////////////////////////////////////////////////////////
176 // Read and return file contents in a single buffer. Note use of
177 // stat() to get the file size. This is a win32 function, believe it
178 // or not. :) Note the REALLY IMPORTANT use of the "b" flag to fopen.
179 // Text mode brain damage will kill us if we're trying to do bytewise
181 static char* readfile(const char* file, int* lenOut)
184 if(stat(file, &data) != 0) return 0;
185 FILE* f = fopen(file, "rb");
187 char* buf = new char[data.st_size];
188 *lenOut = fread(buf, 1, data.st_size, f);
190 if(*lenOut != data.st_size) {
191 // Shouldn't happen, but warn anyway since it represents a
192 // platform bug and not a typical runtime error (missing file,
194 SG_LOG(SG_NASAL, SG_ALERT,
195 "ERROR in Nasal initialization: " <<
196 "short count returned from fread() of " << file <<
197 ". Check your C library!");
204 FGNasalSys::FGNasalSys()
210 _wrappedNodeFunc = naNil();
212 _log = new simgear::BufferedLogCallback(SG_NASAL, SG_INFO);
213 _log->truncateAt(255);
214 sglog().addCallback(_log);
216 naSetErrorHandler(&logError);
219 // Utility. Sets a named key in a hash by C string, rather than nasal
221 void FGNasalSys::hashset(naRef hash, const char* key, naRef val)
223 naRef s = naNewString(_context);
224 naStr_fromdata(s, (char*)key, strlen(key));
225 naHash_set(hash, s, val);
228 void FGNasalSys::globalsSet(const char* key, naRef val)
230 hashset(_globals, key, val);
233 naRef FGNasalSys::call(naRef code, int argc, naRef* args, naRef locals)
235 return callMethod(code, naNil(), argc, args, locals);
238 // Does a naCall() in a new context. Wrapped here to make lock
239 // tracking easier. Extension functions are called with the lock, but
240 // we have to release it before making a new naCall(). So rather than
241 // drop the lock in every extension function that might call back into
242 // Nasal, we keep a stack depth counter here and only unlock/lock
243 // around the naCall if it isn't the first one.
245 naRef FGNasalSys::callMethod(naRef code, naRef self, int argc, naRef* args, naRef locals)
247 return naCallMethod(code, self, argc, args, locals);
250 FGNasalSys::~FGNasalSys()
255 bool FGNasalSys::parseAndRun(const char* sourceCode)
257 naRef code = parse("FGNasalSys::parseAndRun()", sourceCode,
261 call(code, 0, 0, naNil());
266 FGNasalScript* FGNasalSys::parseScript(const char* src, const char* name)
268 FGNasalScript* script = new FGNasalScript();
269 script->_gcKey = -1; // important, if we delete it on a parse
270 script->_nas = this; // error, don't clobber a real handle!
274 sprintf(buf, "FGNasalScript@%p", (void *)script);
278 script->_code = parse(name, src, strlen(src));
279 if(naIsNil(script->_code)) {
284 script->_gcKey = gcSave(script->_code);
289 // The get/setprop functions accept a *list* of strings and walk
290 // through the property tree with them to find the appropriate node.
291 // This allows a Nasal object to hold onto a property path and use it
292 // like a node object, e.g. setprop(ObjRoot, "size-parsecs", 2.02). This
293 // is the utility function that walks the property tree.
294 static SGPropertyNode* findnode(naContext c, naRef* vec, int len, bool create=false)
296 SGPropertyNode* p = globals->get_props();
298 for(int i=0; i<len; i++) {
301 naRuntimeError(c, "bad argument to setprop/getprop path: expected a string");
303 naRef b = i < len-1 ? naNumValue(vec[i+1]) : naNil();
305 p = p->getNode(naStr_data(a), (int)b.num, create);
308 p = p->getNode(naStr_data(a), create);
312 } catch (const string& err) {
313 naRuntimeError(c, (char *)err.c_str());
318 // getprop() extension function. Concatenates its string arguments as
319 // property names and returns the value of the specified property. Or
320 // nil if it doesn't exist.
321 static naRef f_getprop(naContext c, naRef me, int argc, naRef* args)
323 using namespace simgear;
325 naRuntimeError(c, "getprop() expects at least 1 argument");
327 const SGPropertyNode* p = findnode(c, args, argc, false);
328 if(!p) return naNil();
330 switch(p->getType()) {
331 case props::BOOL: case props::INT:
332 case props::LONG: case props::FLOAT:
335 double dv = p->getDoubleValue();
336 if (SGMisc<double>::isNaN(dv)) {
337 SG_LOG(SG_NASAL, SG_ALERT, "Nasal getprop: property " << p->getPath() << " is NaN");
345 case props::UNSPECIFIED:
347 naRef nastr = naNewString(c);
348 const char* val = p->getStringValue();
349 naStr_fromdata(nastr, (char*)val, strlen(val));
352 case props::ALIAS: // <--- FIXME, recurse?
358 // setprop() extension function. Concatenates its string arguments as
359 // property names and sets the value of the specified property to the
361 static naRef f_setprop(naContext c, naRef me, int argc, naRef* args)
364 naRuntimeError(c, "setprop() expects at least 2 arguments");
366 naRef val = args[argc - 1];
367 SGPropertyNode* p = findnode(c, args, argc-1, true);
371 if(naIsString(val)) result = p->setStringValue(naStr_data(val));
374 naRuntimeError(c, "setprop() value is not string or number");
376 if (SGMisc<double>::isNaN(val.num)) {
377 naRuntimeError(c, "setprop() passed a NaN");
380 result = p->setDoubleValue(val.num);
382 } catch (const string& err) {
383 naRuntimeError(c, (char *)err.c_str());
385 return naNum(result);
388 // print() extension function. Concatenates and prints its arguments
389 // to the FlightGear log. Uses the highest log level (SG_ALERT), to
390 // make sure it appears. Is there better way to do this?
391 static naRef f_print(naContext c, naRef me, int argc, naRef* args)
395 for(int i=0; i<n; i++) {
396 naRef s = naStringValue(c, args[i]);
397 if(naIsNil(s)) continue;
398 buf += naStr_data(s);
400 SG_LOG(SG_NASAL, SG_ALERT, buf);
401 return naNum(buf.length());
404 // logprint() extension function. Same as above, all arguments after the
405 // first argument are concatenated. Argument 0 is the log-level, matching
407 static naRef f_logprint(naContext c, naRef me, int argc, naRef* args)
410 naRuntimeError(c, "no prioirty argument to logprint()");
412 naRef priority = args[0];
415 for(int i=1; i<n; i++) {
416 naRef s = naStringValue(c, args[i]);
417 if(naIsNil(s)) continue;
418 buf += naStr_data(s);
420 // use the nasal source file and line for the message location, since
421 // that's more useful than the location here!
422 sglog().log(SG_NASAL, (sgDebugPriority)(int) priority.num,
423 naStr_data(naGetSourceFile(c, 0)),
424 naGetLine(c, 0), buf);
425 return naNum(buf.length());
429 // fgcommand() extension function. Executes a named command via the
430 // FlightGear command manager. Takes a single property node name as
432 static naRef f_fgcommand(naContext c, naRef me, int argc, naRef* args)
434 naRef cmd = argc > 0 ? args[0] : naNil();
435 naRef props = argc > 1 ? args[1] : naNil();
436 if(!naIsString(cmd) || (!naIsNil(props) && !naIsGhost(props)))
437 naRuntimeError(c, "bad arguments to fgcommand()");
438 SGPropertyNode_ptr tmp, *node;
440 node = (SGPropertyNode_ptr*)naGhost_ptr(props);
442 tmp = new SGPropertyNode();
445 return naNum(globals->get_commands()->execute(naStr_data(cmd), *node));
448 // settimer(func, dt, simtime) extension function. Falls through to
449 // FGNasalSys::setTimer(). See there for docs.
450 static naRef f_settimer(naContext c, naRef me, int argc, naRef* args)
452 nasalSys->setTimer(c, argc, args);
456 static naRef f_makeTimer(naContext c, naRef me, int argc, naRef* args)
458 if (!naIsNum(args[0])) {
459 naRuntimeError(c, "bad interval argument to maketimer");
462 naRef func, self = naNil();
463 if (naIsFunc(args[1])) {
465 } else if ((argc == 3) && naIsFunc(args[2])) {
470 TimerObj* timerObj = new TimerObj(nasalSys, func, self, args[0].num);
471 return NasalTimerObj::create(c, timerObj);
474 // setlistener(func, property, bool) extension function. Falls through to
475 // FGNasalSys::setListener(). See there for docs.
476 static naRef f_setlistener(naContext c, naRef me, int argc, naRef* args)
478 return nasalSys->setListener(c, argc, args);
481 // removelistener(int) extension function. Falls through to
482 // FGNasalSys::removeListener(). See there for docs.
483 static naRef f_removelistener(naContext c, naRef me, int argc, naRef* args)
485 return nasalSys->removeListener(c, argc, args);
488 // Returns a ghost handle to the argument to the currently executing
490 static naRef f_cmdarg(naContext c, naRef me, int argc, naRef* args)
492 return nasalSys->cmdArgGhost();
495 // Sets up a property interpolation. The first argument is either a
496 // ghost (SGPropertyNode_ptr*) or a string (global property path) to
497 // interpolate. The second argument is a vector of pairs of
498 // value/delta numbers.
499 static naRef f_interpolate(naContext c, naRef me, int argc, naRef* args)
501 SGPropertyNode* node;
502 naRef prop = argc > 0 ? args[0] : naNil();
503 if(naIsString(prop)) node = fgGetNode(naStr_data(prop), true);
504 else if(naIsGhost(prop)) node = *(SGPropertyNode_ptr*)naGhost_ptr(prop);
507 naRef curve = argc > 1 ? args[1] : naNil();
508 if(!naIsVector(curve)) return naNil();
509 int nPoints = naVec_size(curve) / 2;
511 simgear::PropertyList value_nodes;
512 value_nodes.reserve(nPoints);
514 deltas.reserve(nPoints);
516 for( int i = 0; i < nPoints; ++i )
518 SGPropertyNode* val = new SGPropertyNode;
519 val->setDoubleValue(naNumValue(naVec_get(curve, 2*i)).num);
520 value_nodes.push_back(val);
521 deltas.push_back(naNumValue(naVec_get(curve, 2*i+1)).num);
524 node->interpolate("numeric", value_nodes, deltas, "linear");
528 // This is a better RNG than the one in the default Nasal distribution
529 // (which is based on the C library rand() implementation). It will
531 static naRef f_rand(naContext c, naRef me, int argc, naRef* args)
533 return naNum(sg_random());
536 static naRef f_srand(naContext c, naRef me, int argc, naRef* args)
542 static naRef f_abort(naContext c, naRef me, int argc, naRef* args)
548 // Return an array listing of all files in a directory
549 static naRef f_directory(naContext c, naRef me, int argc, naRef* args)
551 if(argc != 1 || !naIsString(args[0]))
552 naRuntimeError(c, "bad arguments to directory()");
554 simgear::Dir d(SGPath(naStr_data(args[0])));
555 if(!d.exists()) return naNil();
556 naRef result = naNewVector(c);
558 simgear::PathList paths = d.children(simgear::Dir::TYPE_FILE | simgear::Dir::TYPE_DIR);
559 for (unsigned int i=0; i<paths.size(); ++i) {
560 std::string p = paths[i].file();
561 naVec_append(result, naStr_fromdata(naNewString(c), p.c_str(), p.size()));
568 * Given a data path, resolve it in FG_ROOT or an FG_AIRCRFT directory
570 static naRef f_resolveDataPath(naContext c, naRef me, int argc, naRef* args)
572 if(argc != 1 || !naIsString(args[0]))
573 naRuntimeError(c, "bad arguments to resolveDataPath()");
575 SGPath p = globals->resolve_maybe_aircraft_path(naStr_data(args[0]));
576 const char* pdata = p.c_str();
577 return naStr_fromdata(naNewString(c), const_cast<char*>(pdata), strlen(pdata));
580 static naRef f_findDataDir(naContext c, naRef me, int argc, naRef* args)
582 if(argc != 1 || !naIsString(args[0]))
583 naRuntimeError(c, "bad arguments to findDataDir()");
585 SGPath p = globals->find_data_dir(naStr_data(args[0]));
586 const char* pdata = p.c_str();
587 return naStr_fromdata(naNewString(c), const_cast<char*>(pdata), strlen(pdata));
590 class NasalCommand : public SGCommandMgr::Command
593 NasalCommand(FGNasalSys* sys, naRef f, const std::string& name) :
598 globals->get_commands()->addCommandObject(_name, this);
599 _gcRoot = sys->gcSave(f);
602 virtual ~NasalCommand()
604 _sys->gcRelease(_gcRoot);
607 virtual bool operator()(const SGPropertyNode* aNode)
609 _sys->setCmdArg(const_cast<SGPropertyNode*>(aNode));
611 args[0] = _sys->wrappedPropsNode(const_cast<SGPropertyNode*>(aNode));
613 _sys->callMethod(_func, naNil(), 1, args, naNil() /* locals */);
625 static naRef f_addCommand(naContext c, naRef me, int argc, naRef* args)
627 if(argc != 2 || !naIsString(args[0]) || !naIsFunc(args[1]))
628 naRuntimeError(c, "bad arguments to addcommand()");
630 nasalSys->addCommand(args[1], naStr_data(args[0]));
634 static naRef f_removeCommand(naContext c, naRef me, int argc, naRef* args)
636 if ((argc < 1) || !naIsString(args[0]))
637 naRuntimeError(c, "bad argument to removecommand()");
639 globals->get_commands()->removeCommand(naStr_data(args[0]));
644 // parsexml(<path> [, <start-tag> [, <end-tag> [, <data> [, <pi>]]]]);
646 // <path> ... absolute path to an XML file
647 // <start-tag> ... callback function with two args: tag name, attribute hash
648 // <end-tag> ... callback function with one arg: tag name
649 // <data> ... callback function with one arg: data
650 // <pi> ... callback function with two args: target, data
651 // (pi = "processing instruction")
652 // All four callback functions are optional and default to nil.
653 // The function returns nil on error, or the validated file name otherwise.
654 static naRef f_parsexml(naContext c, naRef me, int argc, naRef* args)
656 if(argc < 1 || !naIsString(args[0]))
657 naRuntimeError(c, "parsexml(): path argument missing or not a string");
658 if(argc > 5) argc = 5;
659 for(int i=1; i<argc; i++)
660 if(!(naIsNil(args[i]) || naIsFunc(args[i])))
661 naRuntimeError(c, "parsexml(): callback argument not a function");
663 const char* file = fgValidatePath(naStr_data(args[0]), false);
665 naRuntimeError(c, "parsexml(): reading '%s' denied "
666 "(unauthorized access)", naStr_data(args[0]));
669 std::ifstream input(file);
670 NasalXMLVisitor visitor(c, argc, args);
672 readXML(input, visitor);
673 } catch (const sg_exception& e) {
674 naRuntimeError(c, "parsexml(): file '%s' %s",
675 file, e.getFormattedMessage().c_str());
678 return naStr_fromdata(naNewString(c), const_cast<char*>(file), strlen(file));
681 // Return UNIX epoch time in seconds.
682 static naRef f_systime(naContext c, naRef me, int argc, naRef* args)
686 GetSystemTimeAsFileTime(&ft);
687 double t = (4294967296.0 * ft.dwHighDateTime + ft.dwLowDateTime);
688 // Converts from 100ns units in 1601 epoch to unix epoch in sec
689 return naNum((t * 1e-7) - 11644473600.0);
692 gettimeofday(&td, 0);
693 return naNum(td.tv_sec + 1e-6 * td.tv_usec);
697 // Table of extension functions. Terminate with zeros.
698 static struct { const char* name; naCFunction func; } funcs[] = {
699 { "getprop", f_getprop },
700 { "setprop", f_setprop },
701 { "print", f_print },
702 { "logprint", f_logprint },
703 { "_fgcommand", f_fgcommand },
704 { "settimer", f_settimer },
705 { "maketimer", f_makeTimer },
706 { "_setlistener", f_setlistener },
707 { "removelistener", f_removelistener },
708 { "addcommand", f_addCommand },
709 { "removecommand", f_removeCommand },
710 { "_cmdarg", f_cmdarg },
711 { "_interpolate", f_interpolate },
713 { "srand", f_srand },
714 { "abort", f_abort },
715 { "directory", f_directory },
716 { "resolvepath", f_resolveDataPath },
717 { "finddata", f_findDataDir },
718 { "parsexml", f_parsexml },
719 { "systime", f_systime },
723 naRef FGNasalSys::cmdArgGhost()
725 return propNodeGhost(_cmdArg);
728 void FGNasalSys::setCmdArg(SGPropertyNode* aNode)
733 void FGNasalSys::init()
737 _context = naNewContext();
739 // Start with globals. Add it to itself as a recursive
740 // sub-reference under the name "globals". This gives client-code
741 // write access to the namespace if someone wants to do something
743 _globals = naInit_std(_context);
744 naSave(_context, _globals);
745 hashset(_globals, "globals", _globals);
747 hashset(_globals, "math", naInit_math(_context));
748 hashset(_globals, "bits", naInit_bits(_context));
749 hashset(_globals, "io", naInit_io(_context));
750 hashset(_globals, "thread", naInit_thread(_context));
751 hashset(_globals, "utf8", naInit_utf8(_context));
753 // Add our custom extension functions:
754 for(i=0; funcs[i].name; i++)
755 hashset(_globals, funcs[i].name,
756 naNewFunc(_context, naNewCCode(_context, funcs[i].func)));
758 // And our SGPropertyNode wrapper
759 hashset(_globals, "props", genPropsModule());
761 // Add string methods
762 _string = naInit_string(_context);
763 naSave(_context, _string);
764 initNasalString(_globals, _string, _context);
766 initNasalPositioned(_globals, _context);
767 initNasalPositioned_cppbind(_globals, _context);
768 NasalClipboard::init(this);
769 initNasalCanvas(_globals, _context);
770 initNasalCondition(_globals, _context);
771 initNasalHTTP(_globals, _context);
772 initNasalSGPath(_globals, _context);
774 NasalTimerObj::init("Timer")
775 .method("start", &TimerObj::start)
776 .method("stop", &TimerObj::stop)
777 .method("restart", &TimerObj::restart)
778 .member("singleShot", &TimerObj::isSingleShot, &TimerObj::setSingleShot)
779 .member("isRunning", &TimerObj::isRunning);
781 // Now load the various source files in the Nasal directory
782 simgear::Dir nasalDir(SGPath(globals->get_fg_root(), "Nasal"));
783 loadScriptDirectory(nasalDir);
785 // Add modules in Nasal subdirectories to property tree
786 simgear::PathList directories = nasalDir.children(simgear::Dir::TYPE_DIR+
787 simgear::Dir::NO_DOT_OR_DOTDOT, "");
788 for (unsigned int i=0; i<directories.size(); ++i) {
789 simgear::Dir dir(directories[i]);
790 simgear::PathList scripts = dir.children(simgear::Dir::TYPE_FILE, ".nas");
791 addModule(directories[i].file(), scripts);
794 // set signal and remove node to avoid restoring at reinit
795 const char *s = "nasal-dir-initialized";
796 SGPropertyNode *signal = fgGetNode("/sim/signals", true);
797 signal->setBoolValue(s, true);
798 signal->removeChildren(s);
800 // Pull scripts out of the property tree, too
801 loadPropertyScripts();
803 // now Nasal modules are loaded, we can do some delayed work
804 postinitNasalPositioned(_globals, _context);
805 postinitNasalGUI(_globals, _context);
808 void FGNasalSys::shutdown()
810 shutdownNasalPositioned();
812 map<int, FGNasalListener *>::iterator it, end = _listener.end();
813 for(it = _listener.begin(); it != end; ++it)
817 NasalCommandDict::iterator j = _commands.begin();
818 for (; j != _commands.end(); ++j) {
819 globals->get_commands()->removeCommand(j->first);
823 std::vector<FGNasalModuleListener*>::iterator k = _moduleListeners.begin();
824 for(; k!= _moduleListeners.end(); ++k)
826 _moduleListeners.clear();
830 _string = naNil(); // will be freed by _context
831 naFreeContext(_context);
833 //setWatchedRef(_globals);
835 // remove the recursive reference in globals
836 hashset(_globals, "globals", naNil());
843 naRef FGNasalSys::wrappedPropsNode(SGPropertyNode* aProps)
845 if (naIsNil(_wrappedNodeFunc)) {
846 nasal::Hash props = getGlobals().get<nasal::Hash>("props");
847 _wrappedNodeFunc = props.get("wrapNode");
851 args[0] = propNodeGhost(aProps);
852 naContext ctx = naNewContext();
853 naRef wrapped = naCall(ctx, _wrappedNodeFunc, 1, args, naNil(), naNil());
858 void FGNasalSys::update(double)
860 if( NasalClipboard::getInstance() )
861 NasalClipboard::getInstance()->update();
863 if(!_dead_listener.empty()) {
864 vector<FGNasalListener *>::iterator it, end = _dead_listener.end();
865 for(it = _dead_listener.begin(); it != end; ++it) delete *it;
866 _dead_listener.clear();
869 if (!_loadList.empty())
874 // process Nasal load hook (only one per update loop to avoid excessive lags)
875 _loadList.pop()->load();
878 if (!_unloadList.empty())
880 // process pending Nasal unload hooks after _all_ load hooks were processed
881 // (only unload one per update loop to avoid excessive lags)
882 _unloadList.pop()->unload();
885 // The global context is a legacy thing. We use dynamically
886 // created contexts for naCall() now, so that we can call them
887 // recursively. But there are still spots that want to use it for
888 // naNew*() calls, which end up leaking memory because the context
889 // only clears out its temporary vector when it's *used*. So just
890 // junk it and fetch a new/reinitialized one every frame. This is
891 // clumsy: the right solution would use the dynamic context in all
892 // cases and eliminate _context entirely. But that's more work,
893 // and this works fine (yes, they say "New" and "Free", but
894 // they're very fast, just trust me). -Andy
895 naFreeContext(_context);
896 _context = naNewContext();
899 bool pathSortPredicate(const SGPath& p1, const SGPath& p2)
901 return p1.file() < p2.file();
904 // Loads all scripts in given directory
905 void FGNasalSys::loadScriptDirectory(simgear::Dir nasalDir)
907 simgear::PathList scripts = nasalDir.children(simgear::Dir::TYPE_FILE, ".nas");
908 // Note: simgear::Dir already reports file entries in a deterministic order,
909 // so a fixed loading sequence is guaranteed (same for every user)
910 for (unsigned int i=0; i<scripts.size(); ++i) {
911 SGPath fullpath(scripts[i]);
912 SGPath file = fullpath.file();
913 loadModule(fullpath, file.base().c_str());
917 // Create module with list of scripts
918 void FGNasalSys::addModule(string moduleName, simgear::PathList scripts)
920 if (! scripts.empty())
922 SGPropertyNode* nasal = globals->get_props()->getNode("nasal");
923 SGPropertyNode* module_node = nasal->getChild(moduleName,0,true);
924 for (unsigned int i=0; i<scripts.size(); ++i) {
925 SGPropertyNode* pFileNode = module_node->getChild("file",i,true);
926 pFileNode->setStringValue(scripts[i].c_str());
928 if (!module_node->hasChild("enabled",0))
930 SGPropertyNode* node = module_node->getChild("enabled",0,true);
931 node->setBoolValue(true);
932 node->setAttribute(SGPropertyNode::USERARCHIVE,true);
937 // Loads the scripts found under /nasal in the global tree
938 void FGNasalSys::loadPropertyScripts()
940 SGPropertyNode* nasal = globals->get_props()->getNode("nasal");
943 for(int i=0; i<nasal->nChildren(); i++)
945 SGPropertyNode* n = nasal->getChild(i);
946 loadPropertyScripts(n);
950 // Loads the scripts found under /nasal in the global tree
951 void FGNasalSys::loadPropertyScripts(SGPropertyNode* n)
953 bool is_loaded = false;
955 const char* module = n->getName();
956 if(n->hasChild("module"))
957 module = n->getStringValue("module");
958 if (n->getBoolValue("enabled",true))
960 // allow multiple files to be specified within a single
964 bool file_specified = false;
966 while((fn = n->getChild("file", j)) != NULL) {
967 file_specified = true;
968 const char* file = fn->getStringValue();
970 if (!p.isAbsolute() || !p.exists())
972 p = globals->resolve_maybe_aircraft_path(file);
975 SG_LOG(SG_NASAL, SG_ALERT, "Cannot find Nasal script '" <<
976 file << "' for module '" << module << "'.");
979 ok &= p.isNull() ? false : loadModule(p, module);
983 const char* src = n->getStringValue("script");
984 if(!n->hasChild("script")) src = 0; // Hrm...
986 createModule(module, n->getPath().c_str(), src, strlen(src));
988 if(!file_specified && !src)
990 // module no longer exists - clear the archived "enable" flag
991 n->setAttribute(SGPropertyNode::USERARCHIVE,false);
992 SGPropertyNode* node = n->getChild("enabled",0,false);
994 node->setAttribute(SGPropertyNode::USERARCHIVE,false);
996 SG_LOG(SG_NASAL, SG_ALERT, "Nasal error: " <<
997 "no <file> or <script> defined in " <<
998 "/nasal/" << module);
1005 SGPropertyNode* enable = n->getChild("enabled");
1008 FGNasalModuleListener* listener = new FGNasalModuleListener(n);
1009 _moduleListeners.push_back(listener);
1010 enable->addChangeListener(listener, false);
1013 SGPropertyNode* loaded = n->getChild("loaded",0,true);
1014 loaded->setAttribute(SGPropertyNode::PRESERVE,true);
1015 loaded->setBoolValue(is_loaded);
1018 // Logs a runtime error, with stack trace, to the FlightGear log stream
1019 void FGNasalSys::logError(naContext context)
1021 SG_LOG(SG_NASAL, SG_ALERT, "Nasal runtime error: " << naGetError(context));
1022 int stack_depth = naStackDepth(context);
1023 if( stack_depth < 1 )
1025 SG_LOG(SG_NASAL, SG_ALERT,
1026 " at " << naStr_data(naGetSourceFile(context, 0)) <<
1027 ", line " << naGetLine(context, 0));
1028 for(int i=1; i<stack_depth; i++)
1029 SG_LOG(SG_NASAL, SG_ALERT,
1030 " called from: " << naStr_data(naGetSourceFile(context, i)) <<
1031 ", line " << naGetLine(context, i));
1034 // Reads a script file, executes it, and places the resulting
1035 // namespace into the global namespace under the specified module
1037 bool FGNasalSys::loadModule(SGPath file, const char* module)
1040 char* buf = readfile(file.c_str(), &len);
1042 SG_LOG(SG_NASAL, SG_ALERT,
1043 "Nasal error: could not read script file " << file.c_str()
1044 << " into module " << module);
1048 bool ok = createModule(module, file.c_str(), buf, len);
1053 // Parse and run. Save the local variables namespace, as it will
1054 // become a sub-object of globals. The optional "arg" argument can be
1055 // used to pass an associated property node to the module, which can then
1056 // be accessed via cmdarg(). (This is, for example, used by XML dialogs.)
1057 bool FGNasalSys::createModule(const char* moduleName, const char* fileName,
1058 const char* src, int len,
1059 const SGPropertyNode* cmdarg,
1060 int argc, naRef* args)
1062 naRef code = parse(fileName, src, len);
1066 naContext ctx = naNewContext();
1068 // See if we already have a module hash to use. This allows the
1069 // user to, for example, add functions to the built-in math
1070 // module. Make a new one if necessary.
1072 naRef modname = naNewString(ctx);
1073 naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
1074 if(!naHash_get(_globals, modname, &locals))
1075 locals = naNewHash(ctx);
1077 _cmdArg = (SGPropertyNode*)cmdarg;
1079 call(code, argc, args, locals);
1080 hashset(_globals, moduleName, locals);
1086 void FGNasalSys::deleteModule(const char* moduleName)
1088 naContext ctx = naNewContext();
1089 naRef modname = naNewString(ctx);
1090 naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
1091 naHash_delete(_globals, modname);
1095 naRef FGNasalSys::parse(const char* filename, const char* buf, int len)
1098 naContext ctx = naNewContext();
1099 naRef srcfile = naNewString(ctx);
1100 naStr_fromdata(srcfile, (char*)filename, strlen(filename));
1101 naRef code = naParseCode(ctx, srcfile, 1, (char*)buf, len, &errLine);
1103 SG_LOG(SG_NASAL, SG_ALERT,
1104 "Nasal parse error: " << naGetError(ctx) <<
1105 " in "<< filename <<", line " << errLine);
1110 // Bind to the global namespace before returning
1111 naRef bound = naBindFunction(ctx, code, _globals);
1116 bool FGNasalSys::handleCommand( const char* moduleName,
1117 const char* fileName,
1119 const SGPropertyNode* arg )
1121 naRef code = parse(fileName, src, strlen(src));
1122 if(naIsNil(code)) return false;
1124 // Commands can be run "in" a module. Make sure that module
1125 // exists, and set it up as the local variables hash for the
1127 naRef locals = naNil();
1129 naContext ctx = naNewContext();
1130 naRef modname = naNewString(ctx);
1131 naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
1132 if(!naHash_get(_globals, modname, &locals)) {
1133 locals = naNewHash(ctx);
1134 naHash_set(_globals, modname, locals);
1139 // Cache this command's argument for inspection via cmdarg(). For
1140 // performance reasons, we won't bother with it if the invoked
1141 // code doesn't need it.
1142 _cmdArg = (SGPropertyNode*)arg;
1144 call(code, 0, 0, locals);
1148 bool FGNasalSys::handleCommand(const SGPropertyNode* arg)
1150 const char* src = arg->getStringValue("script");
1151 const char* moduleName = arg->getStringValue("module");
1153 return handleCommand( moduleName,
1154 arg ? arg->getPath(true).c_str() : moduleName,
1159 // settimer(func, dt, simtime) extension function. The first argument
1160 // is a Nasal function to call, the second is a delta time (from now),
1161 // in seconds. The third, if present, is a boolean value indicating
1162 // that "real world" time (rather than simulator time) is to be used.
1164 // Implementation note: the FGTimer objects don't live inside the
1165 // garbage collector, so the Nasal handler functions have to be
1166 // "saved" somehow lest they be inadvertently cleaned. In this case,
1167 // they are inserted into a globals.__gcsave hash and removed on
1169 void FGNasalSys::setTimer(naContext c, int argc, naRef* args)
1171 // Extract the handler, delta, and simtime arguments:
1172 naRef handler = argc > 0 ? args[0] : naNil();
1173 if(!(naIsCode(handler) || naIsCCode(handler) || naIsFunc(handler))) {
1174 naRuntimeError(c, "settimer() with invalid function argument");
1178 naRef delta = argc > 1 ? args[1] : naNil();
1179 if(naIsNil(delta)) {
1180 naRuntimeError(c, "settimer() with invalid time argument");
1184 bool simtime = (argc > 2 && naTrue(args[2])) ? false : true;
1186 // Generate and register a C++ timer handler
1187 NasalTimer* t = new NasalTimer;
1188 t->handler = handler;
1189 t->gcKey = gcSave(handler);
1192 globals->get_event_mgr()->addEvent("NasalTimer",
1193 t, &NasalTimer::timerExpired,
1194 delta.num, simtime);
1197 void FGNasalSys::handleTimer(NasalTimer* t)
1199 call(t->handler, 0, 0, naNil());
1200 gcRelease(t->gcKey);
1203 int FGNasalSys::gcSave(naRef r)
1208 void FGNasalSys::gcRelease(int key)
1213 void FGNasalSys::NasalTimer::timerExpired()
1215 nasal->handleTimer(this);
1219 int FGNasalSys::_listenerId = 0;
1221 // setlistener(<property>, <func> [, <initial=0> [, <persistent=1>]])
1222 // Attaches a callback function to a property (specified as a global
1223 // property path string or a SGPropertyNode_ptr* ghost). If the third,
1224 // optional argument (default=0) is set to 1, then the function is also
1225 // called initially. If the fourth, optional argument is set to 0, then the
1226 // function is only called when the property node value actually changes.
1227 // Otherwise it's called independent of the value whenever the node is
1228 // written to (default). The setlistener() function returns a unique
1229 // id number, which is to be used as argument to the removelistener()
1231 naRef FGNasalSys::setListener(naContext c, int argc, naRef* args)
1233 SGPropertyNode_ptr node;
1234 naRef prop = argc > 0 ? args[0] : naNil();
1235 if(naIsString(prop)) node = fgGetNode(naStr_data(prop), true);
1236 else if(naIsGhost(prop)) node = *(SGPropertyNode_ptr*)naGhost_ptr(prop);
1238 naRuntimeError(c, "setlistener() with invalid property argument");
1243 SG_LOG(SG_NASAL, SG_DEBUG, "Attaching listener to tied property " <<
1246 naRef code = argc > 1 ? args[1] : naNil();
1247 if(!(naIsCode(code) || naIsCCode(code) || naIsFunc(code))) {
1248 naRuntimeError(c, "setlistener() with invalid function argument");
1252 int init = argc > 2 && naIsNum(args[2]) ? int(args[2].num) : 0;
1253 int type = argc > 3 && naIsNum(args[3]) ? int(args[3].num) : 1;
1254 FGNasalListener *nl = new FGNasalListener(node, code, this,
1255 gcSave(code), _listenerId, init, type);
1257 node->addChangeListener(nl, init != 0);
1259 _listener[_listenerId] = nl;
1260 return naNum(_listenerId++);
1263 // removelistener(int) extension function. The argument is the id of
1264 // a listener as returned by the setlistener() function.
1265 naRef FGNasalSys::removeListener(naContext c, int argc, naRef* args)
1267 naRef id = argc > 0 ? args[0] : naNil();
1268 map<int, FGNasalListener *>::iterator it = _listener.find(int(id.num));
1270 if(!naIsNum(id) || it == _listener.end() || it->second->_dead) {
1271 naRuntimeError(c, "removelistener() with invalid listener id");
1275 it->second->_dead = true;
1276 _dead_listener.push_back(it->second);
1277 _listener.erase(it);
1278 return naNum(_listener.size());
1281 void FGNasalSys::registerToLoad(FGNasalModelData *data)
1283 if( _loadList.empty() )
1285 _loadList.push(data);
1288 void FGNasalSys::registerToUnload(FGNasalModelData *data)
1290 _unloadList.push(data);
1293 void FGNasalSys::addCommand(naRef func, const std::string& name)
1295 if (_commands.find(name) != _commands.end()) {
1296 SG_LOG(SG_NASAL, SG_WARN, "duplicate add of command:" << name);
1300 NasalCommand* cmd = new NasalCommand(this, func, name);
1301 _commands[name] = cmd;
1304 void FGNasalSys::removeCommand(const std::string& name)
1306 NasalCommandDict::iterator it = _commands.find(name);
1307 if (it == _commands.end()) {
1308 SG_LOG(SG_NASAL, SG_WARN, "remove of unknwon command:" << name);
1312 // will delete the NasalCommand instance
1313 globals->get_commands()->removeCommand(name);
1314 _commands.erase(it);
1317 //////////////////////////////////////////////////////////////////////////
1318 // FGNasalListener class.
1320 FGNasalListener::FGNasalListener(SGPropertyNode *node, naRef code,
1321 FGNasalSys* nasal, int key, int id,
1322 int init, int type) :
1335 if(_type == 0 && !_init)
1339 FGNasalListener::~FGNasalListener()
1341 _node->removeChangeListener(this);
1342 _nas->gcRelease(_gcKey);
1345 void FGNasalListener::call(SGPropertyNode* which, naRef mode)
1347 if(_active || _dead) return;
1350 arg[0] = _nas->propNodeGhost(which);
1351 arg[1] = _nas->propNodeGhost(_node);
1352 arg[2] = mode; // value changed, child added/removed
1353 arg[3] = naNum(_node != which); // child event?
1354 _nas->call(_code, 4, arg, naNil());
1358 void FGNasalListener::valueChanged(SGPropertyNode* node)
1360 if(_type < 2 && node != _node) return; // skip child events
1361 if(_type > 0 || changed(_node) || _init)
1362 call(node, naNum(0));
1367 void FGNasalListener::childAdded(SGPropertyNode*, SGPropertyNode* child)
1369 if(_type == 2) call(child, naNum(1));
1372 void FGNasalListener::childRemoved(SGPropertyNode*, SGPropertyNode* child)
1374 if(_type == 2) call(child, naNum(-1));
1377 bool FGNasalListener::changed(SGPropertyNode* node)
1379 using namespace simgear;
1380 props::Type type = node->getType();
1381 if(type == props::NONE) return false;
1382 if(type == props::UNSPECIFIED) return true;
1390 long l = node->getLongValue();
1391 result = l != _last_int;
1398 double d = node->getDoubleValue();
1399 result = d != _last_float;
1405 string s = node->getStringValue();
1406 result = s != _last_string;
1413 // NasalXMLVisitor class: handles EasyXML visitor callback for parsexml()
1415 NasalXMLVisitor::NasalXMLVisitor(naContext c, int argc, naRef* args) :
1416 _c(naSubContext(c)),
1417 _start_element(argc > 1 ? args[1] : naNil()),
1418 _end_element(argc > 2 ? args[2] : naNil()),
1419 _data(argc > 3 ? args[3] : naNil()),
1420 _pi(argc > 4 ? args[4] : naNil())
1424 void NasalXMLVisitor::startElement(const char* tag, const XMLAttributes& a)
1426 if(naIsNil(_start_element)) return;
1427 naRef attr = naNewHash(_c);
1428 for(int i=0; i<a.size(); i++) {
1429 naRef name = make_string(a.getName(i));
1430 naRef value = make_string(a.getValue(i));
1431 naHash_set(attr, name, value);
1433 call(_start_element, 2, make_string(tag), attr);
1436 void NasalXMLVisitor::endElement(const char* tag)
1438 if(!naIsNil(_end_element)) call(_end_element, 1, make_string(tag));
1441 void NasalXMLVisitor::data(const char* str, int len)
1443 if(!naIsNil(_data)) call(_data, 1, make_string(str, len));
1446 void NasalXMLVisitor::pi(const char* target, const char* data)
1448 if(!naIsNil(_pi)) call(_pi, 2, make_string(target), make_string(data));
1451 void NasalXMLVisitor::call(naRef func, int num, naRef a, naRef b)
1456 naCall(_c, func, num, args, naNil(), naNil());
1461 naRef NasalXMLVisitor::make_string(const char* s, int n)
1463 return naStr_fromdata(naNewString(_c), const_cast<char *>(s),
1464 n < 0 ? strlen(s) : n);