7 # include <sys/time.h> // gettimeofday
12 #include <sys/types.h>
19 #include <simgear/nasal/nasal.h>
20 #include <simgear/props/props.hxx>
21 #include <simgear/math/sg_random.h>
22 #include <simgear/misc/sg_path.hxx>
23 #include <simgear/misc/interpolator.hxx>
24 #include <simgear/scene/material/mat.hxx>
25 #include <simgear/structure/commands.hxx>
26 #include <simgear/math/sg_geodesy.hxx>
27 #include <simgear/structure/event_mgr.hxx>
29 #include <Airports/runways.hxx>
30 #include <Airports/simple.hxx>
31 #include <Main/globals.hxx>
32 #include <Main/fg_props.hxx>
33 #include <Main/util.hxx>
34 #include <Scenery/scenery.hxx>
36 #include "NasalSys.hxx"
38 static FGNasalSys* nasalSys = 0;
41 // Read and return file contents in a single buffer. Note use of
42 // stat() to get the file size. This is a win32 function, believe it
43 // or not. :) Note the REALLY IMPORTANT use of the "b" flag to fopen.
44 // Text mode brain damage will kill us if we're trying to do bytewise
46 static char* readfile(const char* file, int* lenOut)
49 if(stat(file, &data) != 0) return 0;
50 FILE* f = fopen(file, "rb");
52 char* buf = new char[data.st_size];
53 *lenOut = fread(buf, 1, data.st_size, f);
55 if(*lenOut != data.st_size) {
56 // Shouldn't happen, but warn anyway since it represents a
57 // platform bug and not a typical runtime error (missing file,
59 SG_LOG(SG_NASAL, SG_ALERT,
60 "ERROR in Nasal initialization: " <<
61 "short count returned from fread() of " << file <<
62 ". Check your C library!");
69 FGNasalSys::FGNasalSys()
75 _nextGCKey = 0; // Any value will do
79 // Does a naCall() in a new context. Wrapped here to make lock
80 // tracking easier. Extension functions are called with the lock, but
81 // we have to release it before making a new naCall(). So rather than
82 // drop the lock in every extension function that might call back into
83 // Nasal, we keep a stack depth counter here and only unlock/lock
84 // around the naCall if it isn't the first one.
85 naRef FGNasalSys::call(naRef code, int argc, naRef* args, naRef locals)
87 naContext ctx = naNewContext();
88 if(_callCount) naModUnlock();
90 naRef result = naCall(ctx, code, argc, args, naNil(), locals);
94 if(_callCount) naModLock();
99 FGNasalSys::~FGNasalSys()
102 map<int, FGNasalListener *>::iterator it, end = _listener.end();
103 for(it = _listener.begin(); it != end; ++it)
106 naFreeContext(_context);
110 bool FGNasalSys::parseAndRun(const char* sourceCode)
112 naRef code = parse("FGNasalSys::parseAndRun()", sourceCode,
116 call(code, 0, 0, naNil());
120 FGNasalScript* FGNasalSys::parseScript(const char* src, const char* name)
122 FGNasalScript* script = new FGNasalScript();
123 script->_gcKey = -1; // important, if we delete it on a parse
124 script->_nas = this; // error, don't clobber a real handle!
128 sprintf(buf, "FGNasalScript@%p", (void *)script);
132 script->_code = parse(name, src, strlen(src));
133 if(naIsNil(script->_code)) {
138 script->_gcKey = gcSave(script->_code);
142 // Utility. Sets a named key in a hash by C string, rather than nasal
144 void FGNasalSys::hashset(naRef hash, const char* key, naRef val)
146 naRef s = naNewString(_context);
147 naStr_fromdata(s, (char*)key, strlen(key));
148 naHash_set(hash, s, val);
151 // The get/setprop functions accept a *list* of strings and walk
152 // through the property tree with them to find the appropriate node.
153 // This allows a Nasal object to hold onto a property path and use it
154 // like a node object, e.g. setprop(ObjRoot, "size-parsecs", 2.02). This
155 // is the utility function that walks the property tree.
156 // Future enhancement: support integer arguments to specify array
158 static SGPropertyNode* findnode(naContext c, naRef* vec, int len)
160 SGPropertyNode* p = globals->get_props();
162 for(int i=0; i<len; i++) {
164 if(!naIsString(a)) return 0;
165 p = p->getNode(naStr_data(a));
168 } catch (const string& err) {
169 naRuntimeError(c, (char *)err.c_str());
175 // getprop() extension function. Concatenates its string arguments as
176 // property names and returns the value of the specified property. Or
177 // nil if it doesn't exist.
178 static naRef f_getprop(naContext c, naRef me, int argc, naRef* args)
180 const SGPropertyNode* p = findnode(c, args, argc);
181 if(!p) return naNil();
183 switch(p->getType()) {
184 case SGPropertyNode::BOOL: case SGPropertyNode::INT:
185 case SGPropertyNode::LONG: case SGPropertyNode::FLOAT:
186 case SGPropertyNode::DOUBLE:
187 return naNum(p->getDoubleValue());
189 case SGPropertyNode::STRING:
190 case SGPropertyNode::UNSPECIFIED:
192 naRef nastr = naNewString(c);
193 const char* val = p->getStringValue();
194 naStr_fromdata(nastr, (char*)val, strlen(val));
197 case SGPropertyNode::ALIAS: // <--- FIXME, recurse?
203 // setprop() extension function. Concatenates its string arguments as
204 // property names and sets the value of the specified property to the
206 static naRef f_setprop(naContext c, naRef me, int argc, naRef* args)
209 char buf[BUFLEN + 1];
213 for(int i=0; i<argc-1; i++) {
214 naRef s = naStringValue(c, args[i]);
215 if(naIsNil(s)) return naNil();
216 strncpy(p, naStr_data(s), buflen);
218 buflen = BUFLEN - (p - buf);
219 if(i < (argc-2) && buflen > 0) {
225 SGPropertyNode* props = globals->get_props();
226 naRef val = args[argc-1];
229 if(naIsString(val)) result = props->setStringValue(buf, naStr_data(val));
231 naRef n = naNumValue(val);
233 naRuntimeError(c, "setprop() value is not string or number");
234 result = props->setDoubleValue(buf, n.num);
236 } catch (const string& err) {
237 naRuntimeError(c, (char *)err.c_str());
239 return naNum(result);
243 // print() extension function. Concatenates and prints its arguments
244 // to the FlightGear log. Uses the highest log level (SG_ALERT), to
245 // make sure it appears. Is there better way to do this?
246 static naRef f_print(naContext c, naRef me, int argc, naRef* args)
250 for(int i=0; i<n; i++) {
251 naRef s = naStringValue(c, args[i]);
252 if(naIsNil(s)) continue;
253 buf += naStr_data(s);
255 SG_LOG(SG_GENERAL, SG_ALERT, buf);
256 return naNum(buf.length());
259 // fgcommand() extension function. Executes a named command via the
260 // FlightGear command manager. Takes a single property node name as
262 static naRef f_fgcommand(naContext c, naRef me, int argc, naRef* args)
264 naRef cmd = argc > 0 ? args[0] : naNil();
265 naRef props = argc > 1 ? args[1] : naNil();
266 if(!naIsString(cmd) || (!naIsNil(props) && !naIsGhost(props)))
267 naRuntimeError(c, "bad arguments to fgcommand()");
268 SGPropertyNode_ptr tmp, *node;
270 node = (SGPropertyNode_ptr*)naGhost_ptr(props);
272 tmp = new SGPropertyNode();
275 return naNum(globals->get_commands()->execute(naStr_data(cmd), *node));
278 // settimer(func, dt, simtime) extension function. Falls through to
279 // FGNasalSys::setTimer(). See there for docs.
280 static naRef f_settimer(naContext c, naRef me, int argc, naRef* args)
282 nasalSys->setTimer(c, argc, args);
286 // setlistener(func, property, bool) extension function. Falls through to
287 // FGNasalSys::setListener(). See there for docs.
288 static naRef f_setlistener(naContext c, naRef me, int argc, naRef* args)
290 return nasalSys->setListener(c, argc, args);
293 // removelistener(int) extension function. Falls through to
294 // FGNasalSys::removeListener(). See there for docs.
295 static naRef f_removelistener(naContext c, naRef me, int argc, naRef* args)
297 return nasalSys->removeListener(c, argc, args);
300 // Returns a ghost handle to the argument to the currently executing
302 static naRef f_cmdarg(naContext c, naRef me, int argc, naRef* args)
304 return nasalSys->cmdArgGhost();
307 // Sets up a property interpolation. The first argument is either a
308 // ghost (SGPropertyNode_ptr*) or a string (global property path) to
309 // interpolate. The second argument is a vector of pairs of
310 // value/delta numbers.
311 static naRef f_interpolate(naContext c, naRef me, int argc, naRef* args)
313 SGPropertyNode* node;
314 naRef prop = argc > 0 ? args[0] : naNil();
315 if(naIsString(prop)) node = fgGetNode(naStr_data(prop), true);
316 else if(naIsGhost(prop)) node = *(SGPropertyNode_ptr*)naGhost_ptr(prop);
319 naRef curve = argc > 1 ? args[1] : naNil();
320 if(!naIsVector(curve)) return naNil();
321 int nPoints = naVec_size(curve) / 2;
322 double* values = new double[nPoints];
323 double* deltas = new double[nPoints];
324 for(int i=0; i<nPoints; i++) {
325 values[i] = naNumValue(naVec_get(curve, 2*i)).num;
326 deltas[i] = naNumValue(naVec_get(curve, 2*i+1)).num;
329 ((SGInterpolator*)globals->get_subsystem_mgr()
330 ->get_group(SGSubsystemMgr::INIT)->get_subsystem("interpolator"))
331 ->interpolate(node, nPoints, values, deltas);
338 // This is a better RNG than the one in the default Nasal distribution
339 // (which is based on the C library rand() implementation). It will
341 static naRef f_rand(naContext c, naRef me, int argc, naRef* args)
343 return naNum(sg_random());
346 static naRef f_srand(naContext c, naRef me, int argc, naRef* args)
352 static naRef f_abort(naContext c, naRef me, int argc, naRef* args)
358 // Return an array listing of all files in a directory
359 static naRef f_directory(naContext c, naRef me, int argc, naRef* args)
361 if(argc != 1 || !naIsString(args[0]))
362 naRuntimeError(c, "bad arguments to directory()");
363 naRef ldir = args[0];
364 ulDir* dir = ulOpenDir(naStr_data(args[0]));
365 if(!dir) return naNil();
366 naRef result = naNewVector(c);
368 while((dent = ulReadDir(dir)))
369 naVec_append(result, naStr_fromdata(naNewString(c), dent->d_name,
370 strlen(dent->d_name)));
376 // parsexml(<path> [, <start-tag> [, <end-tag> [, <data> [, <pi>]]]]);
378 // <path> ... absolute path to an XML file
379 // <start-tag> ... callback function with two args: tag name, attribute hash
380 // <end-tag> ... callback function with one arg: tag name
381 // <data> ... callback function with one arg: data
382 // <pi> ... callback function with two args: target, data
383 // (pi = "processing instruction")
384 // All four callback functions are optional and default to nil.
385 // The function returns nil on error, or the validated file name otherwise.
386 static naRef f_parsexml(naContext c, naRef me, int argc, naRef* args)
388 if(argc < 1 || !naIsString(args[0]))
389 naRuntimeError(c, "parsexml(): path argument missing or not a string");
390 if(argc > 5) argc = 5;
391 for(int i=1; i<argc; i++)
392 if(!(naIsNil(args[i]) || naIsFunc(args[i])))
393 naRuntimeError(c, "parsexml(): callback argument not a function");
395 const char* file = fgValidatePath(naStr_data(args[0]), false);
397 naRuntimeError(c, "parsexml(): reading '%s' denied "
398 "(unauthorized access)", naStr_data(args[0]));
401 std::ifstream input(file);
402 NasalXMLVisitor visitor(c, argc, args);
404 readXML(input, visitor);
405 } catch (const sg_exception& e) {
406 naRuntimeError(c, "parsexml(): file '%s' %s",
407 file, e.getFormattedMessage().c_str());
410 return naStr_fromdata(naNewString(c), const_cast<char*>(file), strlen(file));
413 // Return UNIX epoch time in seconds.
414 static naRef f_systime(naContext c, naRef me, int argc, naRef* args)
418 GetSystemTimeAsFileTime(&ft);
419 double t = (4294967296.0 * ft.dwHighDateTime + ft.dwLowDateTime);
420 // Converts from 100ns units in 1601 epoch to unix epoch in sec
421 return naNum((t * 1e-7) - 11644473600.0);
425 do { t = time(0); gettimeofday(&td, 0); } while(t != time(0));
426 return naNum(t + 1e-6 * td.tv_usec);
430 // Convert a cartesian point to a geodetic lat/lon/altitude.
431 static naRef f_carttogeod(naContext c, naRef me, int argc, naRef* args)
433 double lat, lon, alt, xyz[3];
434 if(argc != 3) naRuntimeError(c, "carttogeod() expects 3 arguments");
435 for(int i=0; i<3; i++)
436 xyz[i] = naNumValue(args[i]).num;
437 sgCartToGeod(xyz, &lat, &lon, &alt);
438 lat *= SG_RADIANS_TO_DEGREES;
439 lon *= SG_RADIANS_TO_DEGREES;
440 naRef vec = naNewVector(c);
441 naVec_append(vec, naNum(lat));
442 naVec_append(vec, naNum(lon));
443 naVec_append(vec, naNum(alt));
447 // Convert a geodetic lat/lon/altitude to a cartesian point.
448 static naRef f_geodtocart(naContext c, naRef me, int argc, naRef* args)
450 if(argc != 3) naRuntimeError(c, "geodtocart() expects 3 arguments");
451 double lat = naNumValue(args[0]).num * SG_DEGREES_TO_RADIANS;
452 double lon = naNumValue(args[1]).num * SG_DEGREES_TO_RADIANS;
453 double alt = naNumValue(args[2]).num;
455 sgGeodToCart(lat, lon, alt, xyz);
456 naRef vec = naNewVector(c);
457 naVec_append(vec, naNum(xyz[0]));
458 naVec_append(vec, naNum(xyz[1]));
459 naVec_append(vec, naNum(xyz[2]));
463 // For given geodetic point return array with elevation, and a material data
464 // hash, or nil if there's no information available (tile not loaded). If
465 // information about the material isn't available, then nil is returned instead
467 static naRef f_geodinfo(naContext c, naRef me, int argc, naRef* args)
469 #define HASHSET(s,l,n) naHash_set(matdata, naStr_fromdata(naNewString(c),s,l),n)
470 if(argc < 2 || argc > 3)
471 naRuntimeError(c, "geodinfo() expects 2 or 3 arguments: lat, lon [, maxalt]");
472 double lat = naNumValue(args[0]).num;
473 double lon = naNumValue(args[1]).num;
474 double elev = argc == 3 ? naNumValue(args[2]).num : 10000;
475 const SGMaterial *mat;
476 SGGeod geod = SGGeod::fromDegM(lon, lat, elev);
477 if(!globals->get_scenery()->get_elevation_m(geod, elev, &mat))
479 naRef vec = naNewVector(c);
480 naVec_append(vec, naNum(elev));
481 naRef matdata = naNil();
483 matdata = naNewHash(c);
484 naRef names = naNewVector(c);
485 const vector<string> n = mat->get_names();
486 for(unsigned int i=0; i<n.size(); i++)
487 naVec_append(names, naStr_fromdata(naNewString(c),
488 const_cast<char*>(n[i].c_str()), n[i].size()));
489 HASHSET("names", 5, names);
490 HASHSET("solid", 5, naNum(mat->get_solid()));
491 HASHSET("friction_factor", 15, naNum(mat->get_friction_factor()));
492 HASHSET("rolling_friction", 16, naNum(mat->get_rolling_friction()));
493 HASHSET("load_resistance", 15, naNum(mat->get_load_resistance()));
494 HASHSET("bumpiness", 9, naNum(mat->get_bumpiness()));
495 HASHSET("light_coverage", 14, naNum(mat->get_light_coverage()));
497 naVec_append(vec, matdata);
503 class AirportInfoFilter : public FGAirport::AirportFilter
506 AirportInfoFilter() : type(FGPositioned::AIRPORT) {
509 virtual FGPositioned::Type minType() const {
513 virtual FGPositioned::Type maxType() const {
517 FGPositioned::Type type;
520 // Returns data hash for particular or nearest airport of a <type>, or nil
523 // airportinfo(<id>); e.g. "KSFO"
524 // airportinfo(<type>); type := ("airport"|"seaport"|"heliport")
525 // airportinfo() same as airportinfo("airport")
526 // airportinfo(<lat>, <lon> [, <type>]);
527 static naRef f_airportinfo(naContext c, naRef me, int argc, naRef* args)
529 static SGConstPropertyNode_ptr latn = fgGetNode("/position/latitude-deg", true);
530 static SGConstPropertyNode_ptr lonn = fgGetNode("/position/longitude-deg", true);
532 FGAirport* apt = NULL;
534 if(argc >= 2 && naIsNum(args[0]) && naIsNum(args[1])) {
535 pos = SGGeod::fromDeg(args[1].num, args[0].num);
539 pos = SGGeod::fromDeg(lonn->getDoubleValue(), latn->getDoubleValue());
542 double maxRange = 10000.0; // expose this? or pick a smaller value?
544 AirportInfoFilter filter; // defaults to airports only
547 // fall through and use AIRPORT
548 } else if(argc == 1 && naIsString(args[0])) {
549 const char *s = naStr_data(args[0]);
550 if(!strcmp(s, "airport")) filter.type = FGPositioned::AIRPORT;
551 else if(!strcmp(s, "seaport")) filter.type = FGPositioned::SEAPORT;
552 else if(!strcmp(s, "heliport")) filter.type = FGPositioned::HELIPORT;
554 // user provided an <id>, hopefully
555 apt = FGAirport::findByIdent(s);
557 naRuntimeError(c, "airportinfo() couldn't find airport: %s", s);
562 naRuntimeError(c, "airportinfo() with invalid function arguments");
567 apt = FGAirport::findClosest(pos, maxRange, &filter);
568 if(!apt) return naNil();
571 string id = apt->ident();
572 string name = apt->name();
575 naRef rwys = naNewHash(c);
576 for(unsigned int r=0; r<apt->numRunways(); ++r) {
577 FGRunway* rwy(apt->getRunwayByIndex(r));
579 naRef rwyid = naStr_fromdata(naNewString(c),
580 const_cast<char *>(rwy->ident().c_str()),
581 rwy->ident().length());
583 naRef rwydata = naNewHash(c);
584 #define HASHSET(s,l,n) naHash_set(rwydata, naStr_fromdata(naNewString(c),s,l),n)
585 HASHSET("id", 2, rwyid);
586 HASHSET("lat", 3, naNum(rwy->latitude()));
587 HASHSET("lon", 3, naNum(rwy->longitude()));
588 HASHSET("heading", 7, naNum(rwy->headingDeg()));
589 HASHSET("length", 6, naNum(rwy->lengthM()));
590 HASHSET("width", 5, naNum(rwy->widthM()));
591 HASHSET("threshold", 9, naNum(rwy->displacedThresholdM()));
592 HASHSET("stopway", 7, naNum(rwy->stopwayM()));
594 naHash_set(rwys, rwyid, rwydata);
598 naRef aptdata = naNewHash(c);
599 #define HASHSET(s,l,n) naHash_set(aptdata, naStr_fromdata(naNewString(c),s,l),n)
600 HASHSET("id", 2, naStr_fromdata(naNewString(c),
601 const_cast<char *>(id.c_str()), id.length()));
602 HASHSET("name", 4, naStr_fromdata(naNewString(c),
603 const_cast<char *>(name.c_str()), name.length()));
604 HASHSET("lat", 3, naNum(apt->getLatitude()));
605 HASHSET("lon", 3, naNum(apt->getLongitude()));
606 HASHSET("elevation", 9, naNum(apt->getElevation() * SG_FEET_TO_METER));
607 HASHSET("has_metar", 9, naNum(apt->getMetar()));
608 HASHSET("runways", 7, rwys);
614 // Table of extension functions. Terminate with zeros.
615 static struct { const char* name; naCFunction func; } funcs[] = {
616 { "getprop", f_getprop },
617 { "setprop", f_setprop },
618 { "print", f_print },
619 { "_fgcommand", f_fgcommand },
620 { "settimer", f_settimer },
621 { "_setlistener", f_setlistener },
622 { "removelistener", f_removelistener },
623 { "_cmdarg", f_cmdarg },
624 { "_interpolate", f_interpolate },
626 { "srand", f_srand },
627 { "abort", f_abort },
628 { "directory", f_directory },
629 { "parsexml", f_parsexml },
630 { "systime", f_systime },
631 { "carttogeod", f_carttogeod },
632 { "geodtocart", f_geodtocart },
633 { "geodinfo", f_geodinfo },
634 { "airportinfo", f_airportinfo },
638 naRef FGNasalSys::cmdArgGhost()
640 return propNodeGhost(_cmdArg);
643 void FGNasalSys::init()
647 _context = naNewContext();
649 // Start with globals. Add it to itself as a recursive
650 // sub-reference under the name "globals". This gives client-code
651 // write access to the namespace if someone wants to do something
653 _globals = naInit_std(_context);
654 naSave(_context, _globals);
655 hashset(_globals, "globals", _globals);
657 hashset(_globals, "math", naInit_math(_context));
658 hashset(_globals, "bits", naInit_bits(_context));
659 hashset(_globals, "io", naInit_io(_context));
660 hashset(_globals, "thread", naInit_thread(_context));
661 hashset(_globals, "utf8", naInit_utf8(_context));
663 // Add our custom extension functions:
664 for(i=0; funcs[i].name; i++)
665 hashset(_globals, funcs[i].name,
666 naNewFunc(_context, naNewCCode(_context, funcs[i].func)));
668 // And our SGPropertyNode wrapper
669 hashset(_globals, "props", genPropsModule());
671 // Make a "__gcsave" hash to hold the naRef objects which get
672 // passed to handles outside the interpreter (to protect them from
673 // begin garbage-collected).
674 _gcHash = naNewHash(_context);
675 hashset(_globals, "__gcsave", _gcHash);
677 // Now load the various source files in the Nasal directory
678 SGPath p(globals->get_fg_root());
681 ulDir* dir = ulOpenDir(p.c_str());
682 while(dir && (dent = ulReadDir(dir)) != 0) {
684 fullpath.append(dent->d_name);
685 SGPath file(dent->d_name);
686 if(file.extension() != "nas") continue;
687 loadModule(fullpath, file.base().c_str());
691 // set signal and remove node to avoid restoring at reinit
692 const char *s = "nasal-dir-initialized";
693 SGPropertyNode *signal = fgGetNode("/sim/signals", true);
694 signal->setBoolValue(s, true);
695 signal->removeChildren(s, false);
697 // Pull scripts out of the property tree, too
698 loadPropertyScripts();
701 void FGNasalSys::update(double)
703 if(!_dead_listener.empty()) {
704 vector<FGNasalListener *>::iterator it, end = _dead_listener.end();
705 for(it = _dead_listener.begin(); it != end; ++it) delete *it;
706 _dead_listener.clear();
709 // The global context is a legacy thing. We use dynamically
710 // created contexts for naCall() now, so that we can call them
711 // recursively. But there are still spots that want to use it for
712 // naNew*() calls, which end up leaking memory because the context
713 // only clears out its temporary vector when it's *used*. So just
714 // junk it and fetch a new/reinitialized one every frame. This is
715 // clumsy: the right solution would use the dynamic context in all
716 // cases and eliminate _context entirely. But that's more work,
717 // and this works fine (yes, they say "New" and "Free", but
718 // they're very fast, just trust me). -Andy
719 naFreeContext(_context);
720 _context = naNewContext();
723 // Loads the scripts found under /nasal in the global tree
724 void FGNasalSys::loadPropertyScripts()
726 SGPropertyNode* nasal = globals->get_props()->getNode("nasal");
729 for(int i=0; i<nasal->nChildren(); i++) {
730 SGPropertyNode* n = nasal->getChild(i);
732 const char* module = n->getName();
733 if(n->hasChild("module"))
734 module = n->getStringValue("module");
736 // allow multiple files to be specified within a single
740 bool file_specified = false;
741 while((fn = n->getChild("file", j)) != NULL) {
742 file_specified = true;
743 const char* file = fn->getStringValue();
744 SGPath p(globals->get_fg_root());
746 loadModule(p, module);
750 const char* src = n->getStringValue("script");
751 if(!n->hasChild("script")) src = 0; // Hrm...
753 createModule(module, n->getPath(), src, strlen(src));
755 if(!file_specified && !src)
756 SG_LOG(SG_NASAL, SG_ALERT, "Nasal error: " <<
757 "no <file> or <script> defined in " <<
758 "/nasal/" << module);
762 // Logs a runtime error, with stack trace, to the FlightGear log stream
763 void FGNasalSys::logError(naContext context)
765 SG_LOG(SG_NASAL, SG_ALERT,
766 "Nasal runtime error: " << naGetError(context));
767 SG_LOG(SG_NASAL, SG_ALERT,
768 " at " << naStr_data(naGetSourceFile(context, 0)) <<
769 ", line " << naGetLine(context, 0));
770 for(int i=1; i<naStackDepth(context); i++)
771 SG_LOG(SG_NASAL, SG_ALERT,
772 " called from: " << naStr_data(naGetSourceFile(context, i)) <<
773 ", line " << naGetLine(context, i));
776 // Reads a script file, executes it, and places the resulting
777 // namespace into the global namespace under the specified module
779 void FGNasalSys::loadModule(SGPath file, const char* module)
782 char* buf = readfile(file.c_str(), &len);
784 SG_LOG(SG_NASAL, SG_ALERT,
785 "Nasal error: could not read script file " << file.c_str()
786 << " into module " << module);
790 createModule(module, file.c_str(), buf, len);
794 // Parse and run. Save the local variables namespace, as it will
795 // become a sub-object of globals. The optional "arg" argument can be
796 // used to pass an associated property node to the module, which can then
797 // be accessed via cmdarg(). (This is, for example, used by XML dialogs.)
798 void FGNasalSys::createModule(const char* moduleName, const char* fileName,
799 const char* src, int len,
800 const SGPropertyNode* cmdarg,
801 int argc, naRef* args)
803 naRef code = parse(fileName, src, len);
807 // See if we already have a module hash to use. This allows the
808 // user to, for example, add functions to the built-in math
809 // module. Make a new one if necessary.
811 naRef modname = naNewString(_context);
812 naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
813 if(!naHash_get(_globals, modname, &locals))
814 locals = naNewHash(_context);
816 _cmdArg = (SGPropertyNode*)cmdarg;
818 call(code, argc, args, locals);
819 hashset(_globals, moduleName, locals);
822 void FGNasalSys::deleteModule(const char* moduleName)
824 naRef modname = naNewString(_context);
825 naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
826 naHash_delete(_globals, modname);
829 naRef FGNasalSys::parse(const char* filename, const char* buf, int len)
832 naRef srcfile = naNewString(_context);
833 naStr_fromdata(srcfile, (char*)filename, strlen(filename));
834 naRef code = naParseCode(_context, srcfile, 1, (char*)buf, len, &errLine);
836 SG_LOG(SG_NASAL, SG_ALERT,
837 "Nasal parse error: " << naGetError(_context) <<
838 " in "<< filename <<", line " << errLine);
842 // Bind to the global namespace before returning
843 return naBindFunction(_context, code, _globals);
846 bool FGNasalSys::handleCommand(const SGPropertyNode* arg)
848 const char* nasal = arg->getStringValue("script");
849 const char* moduleName = arg->getStringValue("module");
850 naRef code = parse(arg->getPath(true), nasal, strlen(nasal));
851 if(naIsNil(code)) return false;
853 // Commands can be run "in" a module. Make sure that module
854 // exists, and set it up as the local variables hash for the
856 naRef locals = naNil();
858 naRef modname = naNewString(_context);
859 naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
860 if(!naHash_get(_globals, modname, &locals)) {
861 locals = naNewHash(_context);
862 naHash_set(_globals, modname, locals);
866 // Cache this command's argument for inspection via cmdarg(). For
867 // performance reasons, we won't bother with it if the invoked
868 // code doesn't need it.
869 _cmdArg = (SGPropertyNode*)arg;
871 call(code, 0, 0, locals);
875 // settimer(func, dt, simtime) extension function. The first argument
876 // is a Nasal function to call, the second is a delta time (from now),
877 // in seconds. The third, if present, is a boolean value indicating
878 // that "real world" time (rather than simulator time) is to be used.
880 // Implementation note: the FGTimer objects don't live inside the
881 // garbage collector, so the Nasal handler functions have to be
882 // "saved" somehow lest they be inadvertently cleaned. In this case,
883 // they are inserted into a globals.__gcsave hash and removed on
885 void FGNasalSys::setTimer(naContext c, int argc, naRef* args)
887 // Extract the handler, delta, and simtime arguments:
888 naRef handler = argc > 0 ? args[0] : naNil();
889 if(!(naIsCode(handler) || naIsCCode(handler) || naIsFunc(handler))) {
890 naRuntimeError(c, "settimer() with invalid function argument");
894 naRef delta = argc > 1 ? args[1] : naNil();
896 naRuntimeError(c, "settimer() with invalid time argument");
900 bool simtime = (argc > 2 && naTrue(args[2])) ? false : true;
902 // Generate and register a C++ timer handler
903 NasalTimer* t = new NasalTimer;
904 t->handler = handler;
905 t->gcKey = gcSave(handler);
908 globals->get_event_mgr()->addEvent("NasalTimer",
909 t, &NasalTimer::timerExpired,
913 void FGNasalSys::handleTimer(NasalTimer* t)
915 call(t->handler, 0, 0, naNil());
919 int FGNasalSys::gcSave(naRef r)
921 int key = _nextGCKey++;
922 naHash_set(_gcHash, naNum(key), r);
926 void FGNasalSys::gcRelease(int key)
928 naHash_delete(_gcHash, naNum(key));
931 void FGNasalSys::NasalTimer::timerExpired()
933 nasal->handleTimer(this);
937 int FGNasalSys::_listenerId = 0;
939 // setlistener(<property>, <func> [, <initial=0> [, <persistent=1>]])
940 // Attaches a callback function to a property (specified as a global
941 // property path string or a SGPropertyNode_ptr* ghost). If the third,
942 // optional argument (default=0) is set to 1, then the function is also
943 // called initially. If the fourth, optional argument is set to 0, then the
944 // function is only called when the property node value actually changes.
945 // Otherwise it's called independent of the value whenever the node is
946 // written to (default). The setlistener() function returns a unique
947 // id number, which is to be used as argument to the removelistener()
949 naRef FGNasalSys::setListener(naContext c, int argc, naRef* args)
951 SGPropertyNode_ptr node;
952 naRef prop = argc > 0 ? args[0] : naNil();
953 if(naIsString(prop)) node = fgGetNode(naStr_data(prop), true);
954 else if(naIsGhost(prop)) node = *(SGPropertyNode_ptr*)naGhost_ptr(prop);
956 naRuntimeError(c, "setlistener() with invalid property argument");
961 SG_LOG(SG_NASAL, SG_DEBUG, "Attaching listener to tied property " <<
964 naRef code = argc > 1 ? args[1] : naNil();
965 if(!(naIsCode(code) || naIsCCode(code) || naIsFunc(code))) {
966 naRuntimeError(c, "setlistener() with invalid function argument");
970 int init = argc > 2 && naIsNum(args[2]) ? int(args[2].num) : 0;
971 int type = argc > 3 && naIsNum(args[3]) ? int(args[3].num) : 1;
972 FGNasalListener *nl = new FGNasalListener(node, code, this,
973 gcSave(code), _listenerId, init, type);
975 node->addChangeListener(nl, init);
977 _listener[_listenerId] = nl;
978 return naNum(_listenerId++);
981 // removelistener(int) extension function. The argument is the id of
982 // a listener as returned by the setlistener() function.
983 naRef FGNasalSys::removeListener(naContext c, int argc, naRef* args)
985 naRef id = argc > 0 ? args[0] : naNil();
986 map<int, FGNasalListener *>::iterator it = _listener.find(int(id.num));
988 if(!naIsNum(id) || it == _listener.end() || it->second->_dead) {
989 naRuntimeError(c, "removelistener() with invalid listener id");
993 it->second->_dead = true;
994 _dead_listener.push_back(it->second);
996 return naNum(_listener.size());
1001 // FGNasalListener class.
1003 FGNasalListener::FGNasalListener(SGPropertyNode *node, naRef code,
1004 FGNasalSys* nasal, int key, int id,
1005 int init, int type) :
1018 if(_type == 0 && !_init)
1022 FGNasalListener::~FGNasalListener()
1024 _node->removeChangeListener(this);
1025 _nas->gcRelease(_gcKey);
1028 void FGNasalListener::call(SGPropertyNode* which, naRef mode)
1030 if(_active || _dead) return;
1031 SG_LOG(SG_NASAL, SG_DEBUG, "trigger listener #" << _id);
1034 arg[0] = _nas->propNodeGhost(which);
1035 arg[1] = _nas->propNodeGhost(_node);
1036 arg[2] = mode; // value changed, child added/removed
1037 arg[3] = naNum(_node != which); // child event?
1038 _nas->call(_code, 4, arg, naNil());
1042 void FGNasalListener::valueChanged(SGPropertyNode* node)
1044 if(_type < 2 && node != _node) return; // skip child events
1045 if(_type > 0 || changed(_node) || _init)
1046 call(node, naNum(0));
1051 void FGNasalListener::childAdded(SGPropertyNode*, SGPropertyNode* child)
1053 if(_type == 2) call(child, naNum(1));
1056 void FGNasalListener::childRemoved(SGPropertyNode*, SGPropertyNode* child)
1058 if(_type == 2) call(child, naNum(-1));
1061 bool FGNasalListener::changed(SGPropertyNode* node)
1063 SGPropertyNode::Type type = node->getType();
1064 if(type == SGPropertyNode::NONE) return false;
1065 if(type == SGPropertyNode::UNSPECIFIED) return true;
1069 case SGPropertyNode::BOOL:
1070 case SGPropertyNode::INT:
1071 case SGPropertyNode::LONG:
1073 long l = node->getLongValue();
1074 result = l != _last_int;
1078 case SGPropertyNode::FLOAT:
1079 case SGPropertyNode::DOUBLE:
1081 double d = node->getDoubleValue();
1082 result = d != _last_float;
1088 string s = node->getStringValue();
1089 result = s != _last_string;
1098 // FGNasalModelData class. If sgLoad3DModel() is called with a pointer to
1099 // such a class, then it lets modelLoaded() run the <load> script, and the
1100 // destructor the <unload> script. The latter happens when the model branch
1101 // is removed from the scene graph.
1103 unsigned int FGNasalModelData::_module_id = 0;
1105 void FGNasalModelData::modelLoaded(const string& path, SGPropertyNode *prop,
1110 SGPropertyNode *nasal = prop->getNode("nasal");
1114 SGPropertyNode *load = nasal->getNode("load");
1115 _unload = nasal->getNode("unload");
1116 if(!load && !_unload)
1119 std::stringstream m;
1120 m << "__model" << _module_id++;
1123 const char *s = load ? load->getStringValue() : "";
1126 arg[0] = nasalSys->propNodeGhost(_root);
1127 arg[1] = nasalSys->propNodeGhost(prop);
1128 nasalSys->createModule(_module.c_str(), path.c_str(), s, strlen(s),
1133 FGNasalModelData::~FGNasalModelData()
1139 SG_LOG(SG_NASAL, SG_WARN, "Trying to run an <unload> script "
1140 "without Nasal subsystem present.");
1145 const char *s = _unload->getStringValue();
1146 nasalSys->createModule(_module.c_str(), _module.c_str(), s, strlen(s), _root);
1148 nasalSys->deleteModule(_module.c_str());
1153 // NasalXMLVisitor class: handles EasyXML visitor callback for parsexml()
1155 NasalXMLVisitor::NasalXMLVisitor(naContext c, int argc, naRef* args) :
1156 _c(naSubContext(c)),
1157 _start_element(argc > 1 ? args[1] : naNil()),
1158 _end_element(argc > 2 ? args[2] : naNil()),
1159 _data(argc > 3 ? args[3] : naNil()),
1160 _pi(argc > 4 ? args[4] : naNil())
1164 void NasalXMLVisitor::startElement(const char* tag, const XMLAttributes& a)
1166 if(naIsNil(_start_element)) return;
1167 naRef attr = naNewHash(_c);
1168 for(int i=0; i<a.size(); i++) {
1169 naRef name = make_string(a.getName(i));
1170 naRef value = make_string(a.getValue(i));
1171 naHash_set(attr, name, value);
1173 call(_start_element, 2, make_string(tag), attr);
1176 void NasalXMLVisitor::endElement(const char* tag)
1178 if(!naIsNil(_end_element)) call(_end_element, 1, make_string(tag));
1181 void NasalXMLVisitor::data(const char* str, int len)
1183 if(!naIsNil(_data)) call(_data, 1, make_string(str, len));
1186 void NasalXMLVisitor::pi(const char* target, const char* data)
1188 if(!naIsNil(_pi)) call(_pi, 2, make_string(target), make_string(data));
1191 void NasalXMLVisitor::call(naRef func, int num, naRef a, naRef b)
1196 naCall(_c, func, num, args, naNil(), naNil());
1201 naRef NasalXMLVisitor::make_string(const char* s, int n)
1203 return naStr_fromdata(naNewString(_c), const_cast<char *>(s),
1204 n < 0 ? strlen(s) : n);