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/misc/SimpleMarkdown.hxx>
27 #include <simgear/structure/commands.hxx>
28 #include <simgear/math/sg_geodesy.hxx>
29 #include <simgear/structure/event_mgr.hxx>
30 #include <simgear/debug/BufferedLogCallback.hxx>
32 #include <simgear/nasal/cppbind/from_nasal.hxx>
33 #include <simgear/nasal/cppbind/to_nasal.hxx>
34 #include <simgear/nasal/cppbind/Ghost.hxx>
35 #include <simgear/nasal/cppbind/NasalHash.hxx>
37 #include "NasalSGPath.hxx"
38 #include "NasalSys.hxx"
39 #include "NasalSys_private.hxx"
40 #include "NasalAircraft.hxx"
41 #include "NasalModelData.hxx"
42 #include "NasalPositioned.hxx"
43 #include "NasalCanvas.hxx"
44 #include "NasalClipboard.hxx"
45 #include "NasalCondition.hxx"
46 #include "NasalHTTP.hxx"
47 #include "NasalString.hxx"
49 #include <Main/globals.hxx>
50 #include <Main/util.hxx>
51 #include <Main/fg_props.hxx>
57 void postinitNasalGUI(naRef globals, naContext c);
59 static FGNasalSys* nasalSys = 0;
61 // Listener class for loading Nasal modules on demand
62 class FGNasalModuleListener : public SGPropertyChangeListener
65 FGNasalModuleListener(SGPropertyNode* node);
67 virtual void valueChanged(SGPropertyNode* node);
70 SGPropertyNode_ptr _node;
73 FGNasalModuleListener::FGNasalModuleListener(SGPropertyNode* node) : _node(node)
77 void FGNasalModuleListener::valueChanged(SGPropertyNode*)
79 if (_node->getBoolValue("enabled",false)&&
80 !_node->getBoolValue("loaded",true))
82 nasalSys->loadPropertyScripts(_node);
86 //////////////////////////////////////////////////////////////////////////
89 class TimerObj : public SGReferenced
92 TimerObj(FGNasalSys* sys, naRef f, naRef self, double interval) :
101 snprintf(nm, 128, "nasal-timer-%p", this);
103 _gcRoot = sys->gcSave(f);
104 _gcSelf = sys->gcSave(self);
110 _sys->gcRelease(_gcRoot);
111 _sys->gcRelease(_gcSelf);
114 bool isRunning() const { return _isRunning; }
119 globals->get_event_mgr()->removeTask(_name);
132 globals->get_event_mgr()->addEvent(_name, this, &TimerObj::invoke, _interval);
134 globals->get_event_mgr()->addTask(_name, this, &TimerObj::invoke,
135 _interval, _interval /* delay */);
139 // stop and then start -
140 void restart(double newInterval)
142 _interval = newInterval;
150 // Callback may restart the timer, so update status before callback is
151 // called (Prevent warnings of deleting not existing tasks from the
156 _sys->callMethod(_func, _self, 0, args, naNil() /* locals */);
159 void setSingleShot(bool aSingleShot)
161 _singleShot = aSingleShot;
164 bool isSingleShot() const
165 { return _singleShot; }
170 int _gcRoot, _gcSelf;
176 typedef SGSharedPtr<TimerObj> TimerObjRef;
177 typedef nasal::Ghost<TimerObjRef> NasalTimerObj;
179 ///////////////////////////////////////////////////////////////////////////
181 // Read and return file contents in a single buffer. Note use of
182 // stat() to get the file size. This is a win32 function, believe it
183 // or not. :) Note the REALLY IMPORTANT use of the "b" flag to fopen.
184 // Text mode brain damage will kill us if we're trying to do bytewise
186 static char* readfile(const char* file, int* lenOut)
189 if(stat(file, &data) != 0) return 0;
190 FILE* f = fopen(file, "rb");
192 char* buf = new char[data.st_size];
193 *lenOut = fread(buf, 1, data.st_size, f);
195 if(*lenOut != data.st_size) {
196 // Shouldn't happen, but warn anyway since it represents a
197 // platform bug and not a typical runtime error (missing file,
199 SG_LOG(SG_NASAL, SG_ALERT,
200 "ERROR in Nasal initialization: " <<
201 "short count returned from fread() of " << file <<
202 ". Check your C library!");
209 FGNasalSys::FGNasalSys() :
216 _wrappedNodeFunc = naNil();
218 _log = new simgear::BufferedLogCallback(SG_NASAL, SG_INFO);
219 _log->truncateAt(255);
220 sglog().addCallback(_log);
222 naSetErrorHandler(&logError);
225 // Utility. Sets a named key in a hash by C string, rather than nasal
227 void FGNasalSys::hashset(naRef hash, const char* key, naRef val)
229 naRef s = naNewString(_context);
230 naStr_fromdata(s, (char*)key, strlen(key));
231 naHash_set(hash, s, val);
234 void FGNasalSys::globalsSet(const char* key, naRef val)
236 hashset(_globals, key, val);
239 naRef FGNasalSys::call(naRef code, int argc, naRef* args, naRef locals)
241 return callMethod(code, naNil(), argc, args, locals);
244 naRef FGNasalSys::callWithContext(naContext ctx, naRef code, int argc, naRef* args, naRef locals)
246 return callMethodWithContext(ctx, code, naNil(), argc, args, locals);
249 // Does a naCall() in a new context. Wrapped here to make lock
250 // tracking easier. Extension functions are called with the lock, but
251 // we have to release it before making a new naCall(). So rather than
252 // drop the lock in every extension function that might call back into
253 // Nasal, we keep a stack depth counter here and only unlock/lock
254 // around the naCall if it isn't the first one.
256 naRef FGNasalSys::callMethod(naRef code, naRef self, int argc, naRef* args, naRef locals)
258 return naCallMethod(code, self, argc, args, locals);
261 naRef FGNasalSys::callMethodWithContext(naContext ctx, naRef code, naRef self, int argc, naRef* args, naRef locals)
263 return naCallMethodCtx(ctx, code, self, argc, args, locals);
266 FGNasalSys::~FGNasalSys()
269 SG_LOG(SG_GENERAL, SG_ALERT, "Nasal was not shutdown");
274 bool FGNasalSys::parseAndRun(const char* sourceCode)
276 naContext ctx = naNewContext();
277 naRef code = parse(ctx, "FGNasalSys::parseAndRun()", sourceCode,
283 callWithContext(ctx, code, 0, 0, naNil());
289 FGNasalScript* FGNasalSys::parseScript(const char* src, const char* name)
291 FGNasalScript* script = new FGNasalScript();
292 script->_gcKey = -1; // important, if we delete it on a parse
293 script->_nas = this; // error, don't clobber a real handle!
297 sprintf(buf, "FGNasalScript@%p", (void *)script);
301 script->_code = parse(name, src, strlen(src));
302 if(naIsNil(script->_code)) {
307 script->_gcKey = gcSave(script->_code);
312 // The get/setprop functions accept a *list* of strings and walk
313 // through the property tree with them to find the appropriate node.
314 // This allows a Nasal object to hold onto a property path and use it
315 // like a node object, e.g. setprop(ObjRoot, "size-parsecs", 2.02). This
316 // is the utility function that walks the property tree.
317 static SGPropertyNode* findnode(naContext c, naRef* vec, int len, bool create=false)
319 SGPropertyNode* p = globals->get_props();
321 for(int i=0; i<len; i++) {
324 naRuntimeError(c, "bad argument to setprop/getprop path: expected a string");
326 naRef b = i < len-1 ? naNumValue(vec[i+1]) : naNil();
328 p = p->getNode(naStr_data(a), (int)b.num, create);
331 p = p->getNode(naStr_data(a), create);
335 } catch (const string& err) {
336 naRuntimeError(c, (char *)err.c_str());
341 // getprop() extension function. Concatenates its string arguments as
342 // property names and returns the value of the specified property. Or
343 // nil if it doesn't exist.
344 static naRef f_getprop(naContext c, naRef me, int argc, naRef* args)
346 using namespace simgear;
348 naRuntimeError(c, "getprop() expects at least 1 argument");
350 const SGPropertyNode* p = findnode(c, args, argc, false);
351 if(!p) return naNil();
353 switch(p->getType()) {
354 case props::BOOL: case props::INT:
355 case props::LONG: case props::FLOAT:
358 double dv = p->getDoubleValue();
359 if (SGMisc<double>::isNaN(dv)) {
360 SG_LOG(SG_NASAL, SG_ALERT, "Nasal getprop: property " << p->getPath() << " is NaN");
368 case props::UNSPECIFIED:
370 naRef nastr = naNewString(c);
371 const char* val = p->getStringValue();
372 naStr_fromdata(nastr, (char*)val, strlen(val));
375 case props::ALIAS: // <--- FIXME, recurse?
381 // setprop() extension function. Concatenates its string arguments as
382 // property names and sets the value of the specified property to the
384 static naRef f_setprop(naContext c, naRef me, int argc, naRef* args)
387 naRuntimeError(c, "setprop() expects at least 2 arguments");
389 naRef val = args[argc - 1];
390 SGPropertyNode* p = findnode(c, args, argc-1, true);
394 if(naIsString(val)) result = p->setStringValue(naStr_data(val));
397 naRuntimeError(c, "setprop() value is not string or number");
399 if (SGMisc<double>::isNaN(val.num)) {
400 naRuntimeError(c, "setprop() passed a NaN");
403 result = p->setDoubleValue(val.num);
405 } catch (const string& err) {
406 naRuntimeError(c, (char *)err.c_str());
408 return naNum(result);
411 // print() extension function. Concatenates and prints its arguments
412 // to the FlightGear log. Uses the highest log level (SG_ALERT), to
413 // make sure it appears. Is there better way to do this?
414 static naRef f_print(naContext c, naRef me, int argc, naRef* args)
418 for(int i=0; i<n; i++) {
419 naRef s = naStringValue(c, args[i]);
420 if(naIsNil(s)) continue;
421 buf += naStr_data(s);
423 SG_LOG(SG_NASAL, SG_ALERT, buf);
424 return naNum(buf.length());
427 // logprint() extension function. Same as above, all arguments after the
428 // first argument are concatenated. Argument 0 is the log-level, matching
430 static naRef f_logprint(naContext c, naRef me, int argc, naRef* args)
433 naRuntimeError(c, "no prioirty argument to logprint()");
435 naRef priority = args[0];
438 for(int i=1; i<n; i++) {
439 naRef s = naStringValue(c, args[i]);
440 if(naIsNil(s)) continue;
441 buf += naStr_data(s);
443 // use the nasal source file and line for the message location, since
444 // that's more useful than the location here!
445 sglog().log(SG_NASAL, (sgDebugPriority)(int) priority.num,
446 naStr_data(naGetSourceFile(c, 0)),
447 naGetLine(c, 0), buf);
448 return naNum(buf.length());
452 // fgcommand() extension function. Executes a named command via the
453 // FlightGear command manager. Takes a single property node name as
455 static naRef f_fgcommand(naContext c, naRef me, int argc, naRef* args)
457 naRef cmd = argc > 0 ? args[0] : naNil();
458 naRef props = argc > 1 ? args[1] : naNil();
459 if(!naIsString(cmd) || (!naIsNil(props) && !naIsGhost(props)))
460 naRuntimeError(c, "bad arguments to fgcommand()");
461 SGPropertyNode_ptr tmp, *node;
463 node = (SGPropertyNode_ptr*)naGhost_ptr(props);
465 tmp = new SGPropertyNode();
468 return naNum(globals->get_commands()->execute(naStr_data(cmd), *node));
471 // settimer(func, dt, simtime) extension function. Falls through to
472 // FGNasalSys::setTimer(). See there for docs.
473 static naRef f_settimer(naContext c, naRef me, int argc, naRef* args)
475 nasalSys->setTimer(c, argc, args);
479 static naRef f_makeTimer(naContext c, naRef me, int argc, naRef* args)
481 if (!naIsNum(args[0])) {
482 naRuntimeError(c, "bad interval argument to maketimer");
485 naRef func, self = naNil();
486 if (naIsFunc(args[1])) {
488 } else if ((argc == 3) && naIsFunc(args[2])) {
493 TimerObj* timerObj = new TimerObj(nasalSys, func, self, args[0].num);
494 return nasal::to_nasal(c, timerObj);
497 // setlistener(func, property, bool) extension function. Falls through to
498 // FGNasalSys::setListener(). See there for docs.
499 static naRef f_setlistener(naContext c, naRef me, int argc, naRef* args)
501 return nasalSys->setListener(c, argc, args);
504 // removelistener(int) extension function. Falls through to
505 // FGNasalSys::removeListener(). See there for docs.
506 static naRef f_removelistener(naContext c, naRef me, int argc, naRef* args)
508 return nasalSys->removeListener(c, argc, args);
511 // Returns a ghost handle to the argument to the currently executing
513 static naRef f_cmdarg(naContext c, naRef me, int argc, naRef* args)
515 return nasalSys->cmdArgGhost();
518 // Sets up a property interpolation. The first argument is either a
519 // ghost (SGPropertyNode_ptr*) or a string (global property path) to
520 // interpolate. The second argument is a vector of pairs of
521 // value/delta numbers.
522 static naRef f_interpolate(naContext c, naRef me, int argc, naRef* args)
524 SGPropertyNode* node;
525 naRef prop = argc > 0 ? args[0] : naNil();
526 if(naIsString(prop)) node = fgGetNode(naStr_data(prop), true);
527 else if(naIsGhost(prop)) node = *(SGPropertyNode_ptr*)naGhost_ptr(prop);
530 naRef curve = argc > 1 ? args[1] : naNil();
531 if(!naIsVector(curve)) return naNil();
532 int nPoints = naVec_size(curve) / 2;
534 simgear::PropertyList value_nodes;
535 value_nodes.reserve(nPoints);
537 deltas.reserve(nPoints);
539 for( int i = 0; i < nPoints; ++i )
541 SGPropertyNode* val = new SGPropertyNode;
542 val->setDoubleValue(naNumValue(naVec_get(curve, 2*i)).num);
543 value_nodes.push_back(val);
544 deltas.push_back(naNumValue(naVec_get(curve, 2*i+1)).num);
547 node->interpolate("numeric", value_nodes, deltas, "linear");
551 // This is a better RNG than the one in the default Nasal distribution
552 // (which is based on the C library rand() implementation). It will
554 static naRef f_rand(naContext c, naRef me, int argc, naRef* args)
556 return naNum(sg_random());
559 static naRef f_srand(naContext c, naRef me, int argc, naRef* args)
565 static naRef f_abort(naContext c, naRef me, int argc, naRef* args)
571 // Return an array listing of all files in a directory
572 static naRef f_directory(naContext c, naRef me, int argc, naRef* args)
574 if(argc != 1 || !naIsString(args[0]))
575 naRuntimeError(c, "bad arguments to directory()");
577 simgear::Dir d(SGPath(naStr_data(args[0])));
578 if(!d.exists()) return naNil();
579 naRef result = naNewVector(c);
581 simgear::PathList paths = d.children(simgear::Dir::TYPE_FILE | simgear::Dir::TYPE_DIR);
582 for (unsigned int i=0; i<paths.size(); ++i) {
583 std::string p = paths[i].file();
584 naVec_append(result, naStr_fromdata(naNewString(c), p.c_str(), p.size()));
591 * Given a data path, resolve it in FG_ROOT or an FG_AIRCRFT directory
593 static naRef f_resolveDataPath(naContext c, naRef me, int argc, naRef* args)
595 if(argc != 1 || !naIsString(args[0]))
596 naRuntimeError(c, "bad arguments to resolveDataPath()");
598 SGPath p = globals->resolve_maybe_aircraft_path(naStr_data(args[0]));
599 const char* pdata = p.c_str();
600 return naStr_fromdata(naNewString(c), const_cast<char*>(pdata), strlen(pdata));
603 static naRef f_findDataDir(naContext c, naRef me, int argc, naRef* args)
605 if(argc != 1 || !naIsString(args[0]))
606 naRuntimeError(c, "bad arguments to findDataDir()");
608 SGPath p = globals->find_data_dir(naStr_data(args[0]));
609 const char* pdata = p.c_str();
610 return naStr_fromdata(naNewString(c), const_cast<char*>(pdata), strlen(pdata));
613 class NasalCommand : public SGCommandMgr::Command
616 NasalCommand(FGNasalSys* sys, naRef f, const std::string& name) :
621 globals->get_commands()->addCommandObject(_name, this);
622 _gcRoot = sys->gcSave(f);
625 virtual ~NasalCommand()
627 _sys->gcRelease(_gcRoot);
630 virtual bool operator()(const SGPropertyNode* aNode)
632 _sys->setCmdArg(const_cast<SGPropertyNode*>(aNode));
634 args[0] = _sys->wrappedPropsNode(const_cast<SGPropertyNode*>(aNode));
636 _sys->callMethod(_func, naNil(), 1, args, naNil() /* locals */);
648 static naRef f_addCommand(naContext c, naRef me, int argc, naRef* args)
650 if(argc != 2 || !naIsString(args[0]) || !naIsFunc(args[1]))
651 naRuntimeError(c, "bad arguments to addcommand()");
653 nasalSys->addCommand(args[1], naStr_data(args[0]));
657 static naRef f_removeCommand(naContext c, naRef me, int argc, naRef* args)
659 if ((argc < 1) || !naIsString(args[0]))
660 naRuntimeError(c, "bad argument to removecommand()");
662 globals->get_commands()->removeCommand(naStr_data(args[0]));
667 // parsexml(<path> [, <start-tag> [, <end-tag> [, <data> [, <pi>]]]]);
669 // <path> ... absolute path to an XML file
670 // <start-tag> ... callback function with two args: tag name, attribute hash
671 // <end-tag> ... callback function with one arg: tag name
672 // <data> ... callback function with one arg: data
673 // <pi> ... callback function with two args: target, data
674 // (pi = "processing instruction")
675 // All four callback functions are optional and default to nil.
676 // The function returns nil on error, or the validated file name otherwise.
677 static naRef f_parsexml(naContext c, naRef me, int argc, naRef* args)
679 if(argc < 1 || !naIsString(args[0]))
680 naRuntimeError(c, "parsexml(): path argument missing or not a string");
681 if(argc > 5) argc = 5;
682 for(int i=1; i<argc; i++)
683 if(!(naIsNil(args[i]) || naIsFunc(args[i])))
684 naRuntimeError(c, "parsexml(): callback argument not a function");
686 const char* file = fgValidatePath(naStr_data(args[0]), false);
688 naRuntimeError(c, "parsexml(): reading '%s' denied "
689 "(unauthorized access)", naStr_data(args[0]));
692 std::ifstream input(file);
693 NasalXMLVisitor visitor(c, argc, args);
695 readXML(input, visitor);
696 } catch (const sg_exception& e) {
697 naRuntimeError(c, "parsexml(): file '%s' %s",
698 file, e.getFormattedMessage().c_str());
701 return naStr_fromdata(naNewString(c), const_cast<char*>(file), strlen(file));
705 * Parse very simple and small subset of markdown
707 * parse_markdown(src)
709 static naRef f_parse_markdown(naContext c, naRef me, int argc, naRef* args)
711 nasal::CallContext ctx(c, me, argc, args);
713 simgear::SimpleMarkdown::parse(ctx.requireArg<std::string>(0))
718 * Create md5 hash from given string
722 static naRef f_md5(naContext c, naRef me, int argc, naRef* args)
724 if( argc != 1 || !naIsString(args[0]) )
725 naRuntimeError(c, "md5(): wrong type or number of arguments");
727 return nasal::to_nasal(
729 simgear::strutils::md5(naStr_data(args[0]), naStr_len(args[0]))
733 // Return UNIX epoch time in seconds.
734 static naRef f_systime(naContext c, naRef me, int argc, naRef* args)
738 GetSystemTimeAsFileTime(&ft);
739 double t = (4294967296.0 * ft.dwHighDateTime + ft.dwLowDateTime);
740 // Converts from 100ns units in 1601 epoch to unix epoch in sec
741 return naNum((t * 1e-7) - 11644473600.0);
744 gettimeofday(&td, 0);
745 return naNum(td.tv_sec + 1e-6 * td.tv_usec);
749 // Table of extension functions. Terminate with zeros.
750 static struct { const char* name; naCFunction func; } funcs[] = {
751 { "getprop", f_getprop },
752 { "setprop", f_setprop },
753 { "print", f_print },
754 { "logprint", f_logprint },
755 { "_fgcommand", f_fgcommand },
756 { "settimer", f_settimer },
757 { "maketimer", f_makeTimer },
758 { "_setlistener", f_setlistener },
759 { "removelistener", f_removelistener },
760 { "addcommand", f_addCommand },
761 { "removecommand", f_removeCommand },
762 { "_cmdarg", f_cmdarg },
763 { "_interpolate", f_interpolate },
765 { "srand", f_srand },
766 { "abort", f_abort },
767 { "directory", f_directory },
768 { "resolvepath", f_resolveDataPath },
769 { "finddata", f_findDataDir },
770 { "parsexml", f_parsexml },
771 { "parse_markdown", f_parse_markdown },
773 { "systime", f_systime },
777 naRef FGNasalSys::cmdArgGhost()
779 return propNodeGhost(_cmdArg);
782 void FGNasalSys::setCmdArg(SGPropertyNode* aNode)
787 void FGNasalSys::init()
790 SG_LOG(SG_GENERAL, SG_ALERT, "duplicate init of Nasal");
794 _context = naNewContext();
796 // Start with globals. Add it to itself as a recursive
797 // sub-reference under the name "globals". This gives client-code
798 // write access to the namespace if someone wants to do something
800 _globals = naInit_std(_context);
801 naSave(_context, _globals);
802 hashset(_globals, "globals", _globals);
804 hashset(_globals, "math", naInit_math(_context));
805 hashset(_globals, "bits", naInit_bits(_context));
806 hashset(_globals, "io", naInit_io(_context));
807 hashset(_globals, "thread", naInit_thread(_context));
808 hashset(_globals, "utf8", naInit_utf8(_context));
810 // Add our custom extension functions:
811 for(i=0; funcs[i].name; i++)
812 hashset(_globals, funcs[i].name,
813 naNewFunc(_context, naNewCCode(_context, funcs[i].func)));
815 // And our SGPropertyNode wrapper
816 hashset(_globals, "props", genPropsModule());
818 // Add string methods
819 _string = naInit_string(_context);
820 naSave(_context, _string);
821 initNasalString(_globals, _string, _context);
823 initNasalPositioned(_globals, _context);
824 initNasalPositioned_cppbind(_globals, _context);
825 initNasalAircraft(_globals, _context);
826 NasalClipboard::init(this);
827 initNasalCanvas(_globals, _context);
828 initNasalCondition(_globals, _context);
829 initNasalHTTP(_globals, _context);
830 initNasalSGPath(_globals, _context);
832 NasalTimerObj::init("Timer")
833 .method("start", &TimerObj::start)
834 .method("stop", &TimerObj::stop)
835 .method("restart", &TimerObj::restart)
836 .member("singleShot", &TimerObj::isSingleShot, &TimerObj::setSingleShot)
837 .member("isRunning", &TimerObj::isRunning);
839 // Now load the various source files in the Nasal directory
840 simgear::Dir nasalDir(SGPath(globals->get_fg_root(), "Nasal"));
841 loadScriptDirectory(nasalDir);
843 // Add modules in Nasal subdirectories to property tree
844 simgear::PathList directories = nasalDir.children(simgear::Dir::TYPE_DIR+
845 simgear::Dir::NO_DOT_OR_DOTDOT, "");
846 for (unsigned int i=0; i<directories.size(); ++i) {
847 simgear::Dir dir(directories[i]);
848 simgear::PathList scripts = dir.children(simgear::Dir::TYPE_FILE, ".nas");
849 addModule(directories[i].file(), scripts);
852 // set signal and remove node to avoid restoring at reinit
853 const char *s = "nasal-dir-initialized";
854 SGPropertyNode *signal = fgGetNode("/sim/signals", true);
855 signal->setBoolValue(s, true);
856 signal->removeChildren(s);
858 if( !checkIOrules() )
860 SG_LOG(SG_NASAL, SG_ALERT, "Required IOrules check failed.");
864 // Pull scripts out of the property tree, too
865 loadPropertyScripts();
867 // now Nasal modules are loaded, we can do some delayed work
868 postinitNasalPositioned(_globals, _context);
869 postinitNasalGUI(_globals, _context);
874 void FGNasalSys::shutdown()
880 shutdownNasalPositioned();
882 map<int, FGNasalListener *>::iterator it, end = _listener.end();
883 for(it = _listener.begin(); it != end; ++it)
887 NasalCommandDict::iterator j = _commands.begin();
888 for (; j != _commands.end(); ++j) {
889 globals->get_commands()->removeCommand(j->first);
893 std::vector<FGNasalModuleListener*>::iterator k = _moduleListeners.begin();
894 for(; k!= _moduleListeners.end(); ++k)
896 _moduleListeners.clear();
900 _string = naNil(); // will be freed by _context
901 naFreeContext(_context);
903 //setWatchedRef(_globals);
905 // remove the recursive reference in globals
906 hashset(_globals, "globals", naNil());
913 naRef FGNasalSys::wrappedPropsNode(SGPropertyNode* aProps)
915 if (naIsNil(_wrappedNodeFunc)) {
916 nasal::Hash props = getGlobals().get<nasal::Hash>("props");
917 _wrappedNodeFunc = props.get("wrapNode");
921 args[0] = propNodeGhost(aProps);
922 naContext ctx = naNewContext();
923 naRef wrapped = naCall(ctx, _wrappedNodeFunc, 1, args, naNil(), naNil());
928 void FGNasalSys::update(double)
930 if( NasalClipboard::getInstance() )
931 NasalClipboard::getInstance()->update();
933 if(!_dead_listener.empty()) {
934 vector<FGNasalListener *>::iterator it, end = _dead_listener.end();
935 for(it = _dead_listener.begin(); it != end; ++it) delete *it;
936 _dead_listener.clear();
939 if (!_loadList.empty())
944 // process Nasal load hook (only one per update loop to avoid excessive lags)
945 _loadList.pop()->load();
948 if (!_unloadList.empty())
950 // process pending Nasal unload hooks after _all_ load hooks were processed
951 // (only unload one per update loop to avoid excessive lags)
952 _unloadList.pop()->unload();
955 // Destroy all queued ghosts
956 nasal::ghostProcessDestroyList();
958 // The global context is a legacy thing. We use dynamically
959 // created contexts for naCall() now, so that we can call them
960 // recursively. But there are still spots that want to use it for
961 // naNew*() calls, which end up leaking memory because the context
962 // only clears out its temporary vector when it's *used*. So just
963 // junk it and fetch a new/reinitialized one every frame. This is
964 // clumsy: the right solution would use the dynamic context in all
965 // cases and eliminate _context entirely. But that's more work,
966 // and this works fine (yes, they say "New" and "Free", but
967 // they're very fast, just trust me). -Andy
968 naFreeContext(_context);
969 _context = naNewContext();
972 bool pathSortPredicate(const SGPath& p1, const SGPath& p2)
974 return p1.file() < p2.file();
977 // Loads all scripts in given directory
978 void FGNasalSys::loadScriptDirectory(simgear::Dir nasalDir)
980 simgear::PathList scripts = nasalDir.children(simgear::Dir::TYPE_FILE, ".nas");
981 // Note: simgear::Dir already reports file entries in a deterministic order,
982 // so a fixed loading sequence is guaranteed (same for every user)
983 for (unsigned int i=0; i<scripts.size(); ++i) {
984 SGPath fullpath(scripts[i]);
985 SGPath file = fullpath.file();
986 loadModule(fullpath, file.base().c_str());
990 // Create module with list of scripts
991 void FGNasalSys::addModule(string moduleName, simgear::PathList scripts)
993 if (! scripts.empty())
995 SGPropertyNode* nasal = globals->get_props()->getNode("nasal");
996 SGPropertyNode* module_node = nasal->getChild(moduleName,0,true);
997 for (unsigned int i=0; i<scripts.size(); ++i) {
998 SGPropertyNode* pFileNode = module_node->getChild("file",i,true);
999 pFileNode->setStringValue(scripts[i].c_str());
1001 if (!module_node->hasChild("enabled",0))
1003 SGPropertyNode* node = module_node->getChild("enabled",0,true);
1004 node->setBoolValue(true);
1005 node->setAttribute(SGPropertyNode::USERARCHIVE,true);
1010 // Loads the scripts found under /nasal in the global tree
1011 void FGNasalSys::loadPropertyScripts()
1013 SGPropertyNode* nasal = globals->get_props()->getNode("nasal");
1016 for(int i=0; i<nasal->nChildren(); i++)
1018 SGPropertyNode* n = nasal->getChild(i);
1019 loadPropertyScripts(n);
1023 // Loads the scripts found under /nasal in the global tree
1024 void FGNasalSys::loadPropertyScripts(SGPropertyNode* n)
1026 bool is_loaded = false;
1028 const char* module = n->getName();
1029 if(n->hasChild("module"))
1030 module = n->getStringValue("module");
1031 if (n->getBoolValue("enabled",true))
1033 // allow multiple files to be specified within a single
1037 bool file_specified = false;
1039 while((fn = n->getChild("file", j)) != NULL) {
1040 file_specified = true;
1041 const char* file = fn->getStringValue();
1043 if (!p.isAbsolute() || !p.exists())
1045 p = globals->resolve_maybe_aircraft_path(file);
1048 SG_LOG(SG_NASAL, SG_ALERT, "Cannot find Nasal script '" <<
1049 file << "' for module '" << module << "'.");
1052 ok &= p.isNull() ? false : loadModule(p, module);
1056 const char* src = n->getStringValue("script");
1057 if(!n->hasChild("script")) src = 0; // Hrm...
1059 createModule(module, n->getPath().c_str(), src, strlen(src));
1061 if(!file_specified && !src)
1063 // module no longer exists - clear the archived "enable" flag
1064 n->setAttribute(SGPropertyNode::USERARCHIVE,false);
1065 SGPropertyNode* node = n->getChild("enabled",0,false);
1067 node->setAttribute(SGPropertyNode::USERARCHIVE,false);
1069 SG_LOG(SG_NASAL, SG_ALERT, "Nasal error: " <<
1070 "no <file> or <script> defined in " <<
1071 "/nasal/" << module);
1078 SGPropertyNode* enable = n->getChild("enabled");
1081 FGNasalModuleListener* listener = new FGNasalModuleListener(n);
1082 _moduleListeners.push_back(listener);
1083 enable->addChangeListener(listener, false);
1086 SGPropertyNode* loaded = n->getChild("loaded",0,true);
1087 loaded->setAttribute(SGPropertyNode::PRESERVE,true);
1088 loaded->setBoolValue(is_loaded);
1091 // Logs a runtime error, with stack trace, to the FlightGear log stream
1092 void FGNasalSys::logError(naContext context)
1094 SG_LOG(SG_NASAL, SG_ALERT, "Nasal runtime error: " << naGetError(context));
1095 int stack_depth = naStackDepth(context);
1096 if( stack_depth < 1 )
1098 SG_LOG(SG_NASAL, SG_ALERT,
1099 " at " << naStr_data(naGetSourceFile(context, 0)) <<
1100 ", line " << naGetLine(context, 0));
1101 for(int i=1; i<stack_depth; i++)
1102 SG_LOG(SG_NASAL, SG_ALERT,
1103 " called from: " << naStr_data(naGetSourceFile(context, i)) <<
1104 ", line " << naGetLine(context, i));
1107 // Reads a script file, executes it, and places the resulting
1108 // namespace into the global namespace under the specified module
1110 bool FGNasalSys::loadModule(SGPath file, const char* module)
1113 char* buf = readfile(file.c_str(), &len);
1115 SG_LOG(SG_NASAL, SG_ALERT,
1116 "Nasal error: could not read script file " << file.c_str()
1117 << " into module " << module);
1121 bool ok = createModule(module, file.c_str(), buf, len);
1126 // Parse and run. Save the local variables namespace, as it will
1127 // become a sub-object of globals. The optional "arg" argument can be
1128 // used to pass an associated property node to the module, which can then
1129 // be accessed via cmdarg(). (This is, for example, used by XML dialogs.)
1130 bool FGNasalSys::createModule(const char* moduleName, const char* fileName,
1131 const char* src, int len,
1132 const SGPropertyNode* cmdarg,
1133 int argc, naRef* args)
1135 naContext ctx = naNewContext();
1136 naRef code = parse(ctx, fileName, src, len);
1143 // See if we already have a module hash to use. This allows the
1144 // user to, for example, add functions to the built-in math
1145 // module. Make a new one if necessary.
1147 naRef modname = naNewString(ctx);
1148 naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
1149 if(!naHash_get(_globals, modname, &locals))
1150 locals = naNewHash(ctx);
1152 _cmdArg = (SGPropertyNode*)cmdarg;
1154 callWithContext(ctx, code, argc, args, locals);
1155 hashset(_globals, moduleName, locals);
1161 void FGNasalSys::deleteModule(const char* moduleName)
1164 // can occur on shutdown due to us being shutdown first, but other
1165 // subsystems having Nasal objects.
1169 naContext ctx = naNewContext();
1170 naRef modname = naNewString(ctx);
1171 naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
1172 naHash_delete(_globals, modname);
1176 naRef FGNasalSys::parse(naContext ctx, const char* filename, const char* buf, int len)
1179 naRef srcfile = naNewString(ctx);
1180 naStr_fromdata(srcfile, (char*)filename, strlen(filename));
1181 naRef code = naParseCode(ctx, srcfile, 1, (char*)buf, len, &errLine);
1183 SG_LOG(SG_NASAL, SG_ALERT,
1184 "Nasal parse error: " << naGetError(ctx) <<
1185 " in "<< filename <<", line " << errLine);
1189 // Bind to the global namespace before returning
1190 return naBindFunction(ctx, code, _globals);
1193 bool FGNasalSys::handleCommand( const char* moduleName,
1194 const char* fileName,
1196 const SGPropertyNode* arg )
1198 naContext ctx = naNewContext();
1199 naRef code = parse(ctx, fileName, src, strlen(src));
1205 // Commands can be run "in" a module. Make sure that module
1206 // exists, and set it up as the local variables hash for the
1208 naRef locals = naNil();
1210 naRef modname = naNewString(ctx);
1211 naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
1212 if(!naHash_get(_globals, modname, &locals)) {
1213 locals = naNewHash(ctx);
1214 naHash_set(_globals, modname, locals);
1218 // Cache this command's argument for inspection via cmdarg(). For
1219 // performance reasons, we won't bother with it if the invoked
1220 // code doesn't need it.
1221 _cmdArg = (SGPropertyNode*)arg;
1223 callWithContext(ctx, code, 0, 0, locals);
1228 bool FGNasalSys::handleCommand(const SGPropertyNode* arg)
1230 const char* src = arg->getStringValue("script");
1231 const char* moduleName = arg->getStringValue("module");
1233 return handleCommand( moduleName,
1234 arg->getPath(true).c_str(),
1239 // settimer(func, dt, simtime) extension function. The first argument
1240 // is a Nasal function to call, the second is a delta time (from now),
1241 // in seconds. The third, if present, is a boolean value indicating
1242 // that "real world" time (rather than simulator time) is to be used.
1244 // Implementation note: the FGTimer objects don't live inside the
1245 // garbage collector, so the Nasal handler functions have to be
1246 // "saved" somehow lest they be inadvertently cleaned. In this case,
1247 // they are inserted into a globals.__gcsave hash and removed on
1249 void FGNasalSys::setTimer(naContext c, int argc, naRef* args)
1251 // Extract the handler, delta, and simtime arguments:
1252 naRef handler = argc > 0 ? args[0] : naNil();
1253 if(!(naIsCode(handler) || naIsCCode(handler) || naIsFunc(handler))) {
1254 naRuntimeError(c, "settimer() with invalid function argument");
1258 naRef delta = argc > 1 ? args[1] : naNil();
1259 if(naIsNil(delta)) {
1260 naRuntimeError(c, "settimer() with invalid time argument");
1264 bool simtime = (argc > 2 && naTrue(args[2])) ? false : true;
1266 // Generate and register a C++ timer handler
1267 NasalTimer* t = new NasalTimer;
1268 t->handler = handler;
1269 t->gcKey = gcSave(handler);
1272 globals->get_event_mgr()->addEvent("NasalTimer",
1273 t, &NasalTimer::timerExpired,
1274 delta.num, simtime);
1277 void FGNasalSys::handleTimer(NasalTimer* t)
1279 call(t->handler, 0, 0, naNil());
1280 gcRelease(t->gcKey);
1283 int FGNasalSys::gcSave(naRef r)
1288 void FGNasalSys::gcRelease(int key)
1293 //------------------------------------------------------------------------------
1294 bool FGNasalSys::checkIOrules()
1296 // Ensure IOrules and path validation are working properly by trying to
1297 // access a folder/file which should never be accessible.
1298 const char* no_access_path =
1304 bool success = true;
1307 if( fgValidatePath(no_access_path, true) )
1314 "Check your IOrules! (write to '" << no_access_path << "' is allowed)"
1319 if( fgValidatePath(no_access_path, false) )
1326 "Check your IOrules! (read from '" << no_access_path << "' is allowed)"
1333 //------------------------------------------------------------------------------
1334 void FGNasalSys::NasalTimer::timerExpired()
1336 nasal->handleTimer(this);
1340 int FGNasalSys::_listenerId = 0;
1342 // setlistener(<property>, <func> [, <initial=0> [, <persistent=1>]])
1343 // Attaches a callback function to a property (specified as a global
1344 // property path string or a SGPropertyNode_ptr* ghost). If the third,
1345 // optional argument (default=0) is set to 1, then the function is also
1346 // called initially. If the fourth, optional argument is set to 0, then the
1347 // function is only called when the property node value actually changes.
1348 // Otherwise it's called independent of the value whenever the node is
1349 // written to (default). The setlistener() function returns a unique
1350 // id number, which is to be used as argument to the removelistener()
1352 naRef FGNasalSys::setListener(naContext c, int argc, naRef* args)
1354 SGPropertyNode_ptr node;
1355 naRef prop = argc > 0 ? args[0] : naNil();
1356 if(naIsString(prop)) node = fgGetNode(naStr_data(prop), true);
1357 else if(naIsGhost(prop)) node = *(SGPropertyNode_ptr*)naGhost_ptr(prop);
1359 naRuntimeError(c, "setlistener() with invalid property argument");
1364 SG_LOG(SG_NASAL, SG_DEBUG, "Attaching listener to tied property " <<
1367 naRef code = argc > 1 ? args[1] : naNil();
1368 if(!(naIsCode(code) || naIsCCode(code) || naIsFunc(code))) {
1369 naRuntimeError(c, "setlistener() with invalid function argument");
1373 int init = argc > 2 && naIsNum(args[2]) ? int(args[2].num) : 0;
1374 int type = argc > 3 && naIsNum(args[3]) ? int(args[3].num) : 1;
1375 FGNasalListener *nl = new FGNasalListener(node, code, this,
1376 gcSave(code), _listenerId, init, type);
1378 node->addChangeListener(nl, init != 0);
1380 _listener[_listenerId] = nl;
1381 return naNum(_listenerId++);
1384 // removelistener(int) extension function. The argument is the id of
1385 // a listener as returned by the setlistener() function.
1386 naRef FGNasalSys::removeListener(naContext c, int argc, naRef* args)
1388 naRef id = argc > 0 ? args[0] : naNil();
1389 map<int, FGNasalListener *>::iterator it = _listener.find(int(id.num));
1391 if(!naIsNum(id) || it == _listener.end() || it->second->_dead) {
1392 naRuntimeError(c, "removelistener() with invalid listener id");
1396 it->second->_dead = true;
1397 _dead_listener.push_back(it->second);
1398 _listener.erase(it);
1399 return naNum(_listener.size());
1402 void FGNasalSys::registerToLoad(FGNasalModelData *data)
1404 if( _loadList.empty() )
1406 _loadList.push(data);
1409 void FGNasalSys::registerToUnload(FGNasalModelData *data)
1411 _unloadList.push(data);
1414 void FGNasalSys::addCommand(naRef func, const std::string& name)
1416 if (_commands.find(name) != _commands.end()) {
1417 SG_LOG(SG_NASAL, SG_WARN, "duplicate add of command:" << name);
1421 NasalCommand* cmd = new NasalCommand(this, func, name);
1422 _commands[name] = cmd;
1425 void FGNasalSys::removeCommand(const std::string& name)
1427 NasalCommandDict::iterator it = _commands.find(name);
1428 if (it == _commands.end()) {
1429 SG_LOG(SG_NASAL, SG_WARN, "remove of unknwon command:" << name);
1433 // will delete the NasalCommand instance
1434 globals->get_commands()->removeCommand(name);
1435 _commands.erase(it);
1438 //////////////////////////////////////////////////////////////////////////
1439 // FGNasalListener class.
1441 FGNasalListener::FGNasalListener(SGPropertyNode *node, naRef code,
1442 FGNasalSys* nasal, int key, int id,
1443 int init, int type) :
1456 if(_type == 0 && !_init)
1460 FGNasalListener::~FGNasalListener()
1462 _node->removeChangeListener(this);
1463 _nas->gcRelease(_gcKey);
1466 void FGNasalListener::call(SGPropertyNode* which, naRef mode)
1468 if(_active || _dead) return;
1471 arg[0] = _nas->propNodeGhost(which);
1472 arg[1] = _nas->propNodeGhost(_node);
1473 arg[2] = mode; // value changed, child added/removed
1474 arg[3] = naNum(_node != which); // child event?
1475 _nas->call(_code, 4, arg, naNil());
1479 void FGNasalListener::valueChanged(SGPropertyNode* node)
1481 if(_type < 2 && node != _node) return; // skip child events
1482 if(_type > 0 || changed(_node) || _init)
1483 call(node, naNum(0));
1488 void FGNasalListener::childAdded(SGPropertyNode*, SGPropertyNode* child)
1490 if(_type == 2) call(child, naNum(1));
1493 void FGNasalListener::childRemoved(SGPropertyNode*, SGPropertyNode* child)
1495 if(_type == 2) call(child, naNum(-1));
1498 bool FGNasalListener::changed(SGPropertyNode* node)
1500 using namespace simgear;
1501 props::Type type = node->getType();
1502 if(type == props::NONE) return false;
1503 if(type == props::UNSPECIFIED) return true;
1511 long l = node->getLongValue();
1512 result = l != _last_int;
1519 double d = node->getDoubleValue();
1520 result = d != _last_float;
1526 string s = node->getStringValue();
1527 result = s != _last_string;
1534 // NasalXMLVisitor class: handles EasyXML visitor callback for parsexml()
1536 NasalXMLVisitor::NasalXMLVisitor(naContext c, int argc, naRef* args) :
1537 _c(naSubContext(c)),
1538 _start_element(argc > 1 ? args[1] : naNil()),
1539 _end_element(argc > 2 ? args[2] : naNil()),
1540 _data(argc > 3 ? args[3] : naNil()),
1541 _pi(argc > 4 ? args[4] : naNil())
1545 void NasalXMLVisitor::startElement(const char* tag, const XMLAttributes& a)
1547 if(naIsNil(_start_element)) return;
1548 naRef attr = naNewHash(_c);
1549 for(int i=0; i<a.size(); i++) {
1550 naRef name = make_string(a.getName(i));
1551 naRef value = make_string(a.getValue(i));
1552 naHash_set(attr, name, value);
1554 call(_start_element, 2, make_string(tag), attr);
1557 void NasalXMLVisitor::endElement(const char* tag)
1559 if(!naIsNil(_end_element)) call(_end_element, 1, make_string(tag));
1562 void NasalXMLVisitor::data(const char* str, int len)
1564 if(!naIsNil(_data)) call(_data, 1, make_string(str, len));
1567 void NasalXMLVisitor::pi(const char* target, const char* data)
1569 if(!naIsNil(_pi)) call(_pi, 2, make_string(target), make_string(data));
1572 void NasalXMLVisitor::call(naRef func, int num, naRef a, naRef b)
1577 naCall(_c, func, num, args, naNil(), naNil());
1582 naRef NasalXMLVisitor::make_string(const char* s, int n)
1584 return naStr_fromdata(naNewString(_c), const_cast<char *>(s),
1585 n < 0 ? strlen(s) : n);