7 # include <sys/time.h> // gettimeofday
12 #include <sys/types.h>
18 #include <simgear/nasal/nasal.h>
19 #include <simgear/props/props.hxx>
20 #include <simgear/math/sg_random.h>
21 #include <simgear/misc/sg_path.hxx>
22 #include <simgear/misc/interpolator.hxx>
23 #include <simgear/scene/material/mat.hxx>
24 #include <simgear/structure/commands.hxx>
25 #include <simgear/math/sg_geodesy.hxx>
26 #include <simgear/structure/event_mgr.hxx>
28 #include <Airports/runways.hxx>
29 #include <Airports/simple.hxx>
30 #include <Main/globals.hxx>
31 #include <Main/fg_props.hxx>
32 #include <Main/util.hxx>
33 #include <Scenery/scenery.hxx>
35 #include "NasalSys.hxx"
37 static FGNasalSys* nasalSys = 0;
40 // Read and return file contents in a single buffer. Note use of
41 // stat() to get the file size. This is a win32 function, believe it
42 // or not. :) Note the REALLY IMPORTANT use of the "b" flag to fopen.
43 // Text mode brain damage will kill us if we're trying to do bytewise
45 static char* readfile(const char* file, int* lenOut)
48 if(stat(file, &data) != 0) return 0;
49 FILE* f = fopen(file, "rb");
51 char* buf = new char[data.st_size];
52 *lenOut = fread(buf, 1, data.st_size, f);
54 if(*lenOut != data.st_size) {
55 // Shouldn't happen, but warn anyway since it represents a
56 // platform bug and not a typical runtime error (missing file,
58 SG_LOG(SG_NASAL, SG_ALERT,
59 "ERROR in Nasal initialization: " <<
60 "short count returned from fread() of " << file <<
61 ". Check your C library!");
68 FGNasalSys::FGNasalSys()
74 _nextGCKey = 0; // Any value will do
78 // Does a naCall() in a new context. Wrapped here to make lock
79 // tracking easier. Extension functions are called with the lock, but
80 // we have to release it before making a new naCall(). So rather than
81 // drop the lock in every extension function that might call back into
82 // Nasal, we keep a stack depth counter here and only unlock/lock
83 // around the naCall if it isn't the first one.
84 naRef FGNasalSys::call(naRef code, int argc, naRef* args, naRef locals)
86 naContext ctx = naNewContext();
87 if(_callCount) naModUnlock();
89 naRef result = naCall(ctx, code, argc, args, naNil(), locals);
93 if(_callCount) naModLock();
98 FGNasalSys::~FGNasalSys()
101 map<int, FGNasalListener *>::iterator it, end = _listener.end();
102 for(it = _listener.begin(); it != end; ++it)
105 naFreeContext(_context);
109 bool FGNasalSys::parseAndRun(const char* sourceCode)
111 naRef code = parse("FGNasalSys::parseAndRun()", sourceCode,
115 call(code, 0, 0, naNil());
119 FGNasalScript* FGNasalSys::parseScript(const char* src, const char* name)
121 FGNasalScript* script = new FGNasalScript();
122 script->_gcKey = -1; // important, if we delete it on a parse
123 script->_nas = this; // error, don't clobber a real handle!
127 sprintf(buf, "FGNasalScript@%p", (void *)script);
131 script->_code = parse(name, src, strlen(src));
132 if(naIsNil(script->_code)) {
137 script->_gcKey = gcSave(script->_code);
141 // Utility. Sets a named key in a hash by C string, rather than nasal
143 void FGNasalSys::hashset(naRef hash, const char* key, naRef val)
145 naRef s = naNewString(_context);
146 naStr_fromdata(s, (char*)key, strlen(key));
147 naHash_set(hash, s, val);
150 // The get/setprop functions accept a *list* of strings and walk
151 // through the property tree with them to find the appropriate node.
152 // This allows a Nasal object to hold onto a property path and use it
153 // like a node object, e.g. setprop(ObjRoot, "size-parsecs", 2.02). This
154 // is the utility function that walks the property tree.
155 // Future enhancement: support integer arguments to specify array
157 static SGPropertyNode* findnode(naContext c, naRef* vec, int len)
159 SGPropertyNode* p = globals->get_props();
161 for(int i=0; i<len; i++) {
163 if(!naIsString(a)) return 0;
164 p = p->getNode(naStr_data(a));
167 } catch (const string& err) {
168 naRuntimeError(c, (char *)err.c_str());
174 // getprop() extension function. Concatenates its string arguments as
175 // property names and returns the value of the specified property. Or
176 // nil if it doesn't exist.
177 static naRef f_getprop(naContext c, naRef me, int argc, naRef* args)
179 const SGPropertyNode* p = findnode(c, args, argc);
180 if(!p) return naNil();
182 switch(p->getType()) {
183 case SGPropertyNode::BOOL: case SGPropertyNode::INT:
184 case SGPropertyNode::LONG: case SGPropertyNode::FLOAT:
185 case SGPropertyNode::DOUBLE:
186 return naNum(p->getDoubleValue());
188 case SGPropertyNode::STRING:
189 case SGPropertyNode::UNSPECIFIED:
191 naRef nastr = naNewString(c);
192 const char* val = p->getStringValue();
193 naStr_fromdata(nastr, (char*)val, strlen(val));
196 case SGPropertyNode::ALIAS: // <--- FIXME, recurse?
202 // setprop() extension function. Concatenates its string arguments as
203 // property names and sets the value of the specified property to the
205 static naRef f_setprop(naContext c, naRef me, int argc, naRef* args)
208 char buf[BUFLEN + 1];
212 for(int i=0; i<argc-1; i++) {
213 naRef s = naStringValue(c, args[i]);
214 if(naIsNil(s)) return naNil();
215 strncpy(p, naStr_data(s), buflen);
217 buflen = BUFLEN - (p - buf);
218 if(i < (argc-2) && buflen > 0) {
224 SGPropertyNode* props = globals->get_props();
225 naRef val = args[argc-1];
228 if(naIsString(val)) result = props->setStringValue(buf, naStr_data(val));
230 naRef n = naNumValue(val);
232 naRuntimeError(c, "setprop() value is not string or number");
233 result = props->setDoubleValue(buf, n.num);
235 } catch (const string& err) {
236 naRuntimeError(c, (char *)err.c_str());
238 return naNum(result);
242 // print() extension function. Concatenates and prints its arguments
243 // to the FlightGear log. Uses the highest log level (SG_ALERT), to
244 // make sure it appears. Is there better way to do this?
245 static naRef f_print(naContext c, naRef me, int argc, naRef* args)
249 for(int i=0; i<n; i++) {
250 naRef s = naStringValue(c, args[i]);
251 if(naIsNil(s)) continue;
252 buf += naStr_data(s);
254 SG_LOG(SG_GENERAL, SG_ALERT, buf);
255 return naNum(buf.length());
258 // fgcommand() extension function. Executes a named command via the
259 // FlightGear command manager. Takes a single property node name as
261 static naRef f_fgcommand(naContext c, naRef me, int argc, naRef* args)
263 naRef cmd = argc > 0 ? args[0] : naNil();
264 naRef props = argc > 1 ? args[1] : naNil();
265 if(!naIsString(cmd) || (!naIsNil(props) && !naIsGhost(props)))
266 naRuntimeError(c, "bad arguments to fgcommand()");
267 SGPropertyNode_ptr tmp, *node;
269 node = (SGPropertyNode_ptr*)naGhost_ptr(props);
271 tmp = new SGPropertyNode();
274 return naNum(globals->get_commands()->execute(naStr_data(cmd), *node));
277 // settimer(func, dt, simtime) extension function. Falls through to
278 // FGNasalSys::setTimer(). See there for docs.
279 static naRef f_settimer(naContext c, naRef me, int argc, naRef* args)
281 nasalSys->setTimer(c, argc, args);
285 // setlistener(func, property, bool) extension function. Falls through to
286 // FGNasalSys::setListener(). See there for docs.
287 static naRef f_setlistener(naContext c, naRef me, int argc, naRef* args)
289 return nasalSys->setListener(c, argc, args);
292 // removelistener(int) extension function. Falls through to
293 // FGNasalSys::removeListener(). See there for docs.
294 static naRef f_removelistener(naContext c, naRef me, int argc, naRef* args)
296 return nasalSys->removeListener(c, argc, args);
299 // Returns a ghost handle to the argument to the currently executing
301 static naRef f_cmdarg(naContext c, naRef me, int argc, naRef* args)
303 return nasalSys->cmdArgGhost();
306 // Sets up a property interpolation. The first argument is either a
307 // ghost (SGPropertyNode_ptr*) or a string (global property path) to
308 // interpolate. The second argument is a vector of pairs of
309 // value/delta numbers.
310 static naRef f_interpolate(naContext c, naRef me, int argc, naRef* args)
312 SGPropertyNode* node;
313 naRef prop = argc > 0 ? args[0] : naNil();
314 if(naIsString(prop)) node = fgGetNode(naStr_data(prop), true);
315 else if(naIsGhost(prop)) node = *(SGPropertyNode_ptr*)naGhost_ptr(prop);
318 naRef curve = argc > 1 ? args[1] : naNil();
319 if(!naIsVector(curve)) return naNil();
320 int nPoints = naVec_size(curve) / 2;
321 double* values = new double[nPoints];
322 double* deltas = new double[nPoints];
323 for(int i=0; i<nPoints; i++) {
324 values[i] = naNumValue(naVec_get(curve, 2*i)).num;
325 deltas[i] = naNumValue(naVec_get(curve, 2*i+1)).num;
328 ((SGInterpolator*)globals->get_subsystem_mgr()
329 ->get_group(SGSubsystemMgr::INIT)->get_subsystem("interpolator"))
330 ->interpolate(node, nPoints, values, deltas);
337 // This is a better RNG than the one in the default Nasal distribution
338 // (which is based on the C library rand() implementation). It will
340 static naRef f_rand(naContext c, naRef me, int argc, naRef* args)
342 return naNum(sg_random());
345 static naRef f_srand(naContext c, naRef me, int argc, naRef* args)
351 static naRef f_abort(naContext c, naRef me, int argc, naRef* args)
357 // Return an array listing of all files in a directory
358 static naRef f_directory(naContext c, naRef me, int argc, naRef* args)
360 if(argc != 1 || !naIsString(args[0]))
361 naRuntimeError(c, "bad arguments to directory()");
362 naRef ldir = args[0];
363 ulDir* dir = ulOpenDir(naStr_data(args[0]));
364 if(!dir) return naNil();
365 naRef result = naNewVector(c);
367 while((dent = ulReadDir(dir)))
368 naVec_append(result, naStr_fromdata(naNewString(c), dent->d_name,
369 strlen(dent->d_name)));
375 // parsexml(<path> [, <start-tag> [, <end-tag> [, <data> [, <pi>]]]]);
377 // <path> ... absolute path to an XML file
378 // <start-tag> ... callback function with two args: tag name, attribute hash
379 // <end-tag> ... callback function with one arg: tag name
380 // <data> ... callback function with one arg: data
381 // <pi> ... callback function with two args: target, data
382 // (pi = "processing instruction")
383 // All four callback functions are optional and default to nil.
384 // The function returns nil on error, or the validated file name otherwise.
385 static naRef f_parsexml(naContext c, naRef me, int argc, naRef* args)
387 if(argc < 1 || !naIsString(args[0]))
388 naRuntimeError(c, "parsexml(): path argument missing or not a string");
389 if(argc > 5) argc = 5;
390 for(int i=1; i<argc; i++)
391 if(!(naIsNil(args[i]) || naIsFunc(args[i])))
392 naRuntimeError(c, "parsexml(): callback argument not a function");
394 const char* file = fgValidatePath(naStr_data(args[0]), false);
396 naRuntimeError(c, "parsexml(): reading '%s' denied "
397 "(unauthorized access)", naStr_data(args[0]));
400 std::ifstream input(file);
401 NasalXMLVisitor visitor(c, argc, args);
403 readXML(input, visitor);
404 } catch (const sg_exception& e) {
405 naRuntimeError(c, "parsexml(): file '%s' %s",
406 file, e.getFormattedMessage().c_str());
409 return naStr_fromdata(naNewString(c), const_cast<char*>(file), strlen(file));
412 // Return UNIX epoch time in seconds.
413 static naRef f_systime(naContext c, naRef me, int argc, naRef* args)
417 GetSystemTimeAsFileTime(&ft);
418 double t = (4294967296.0 * ft.dwHighDateTime + ft.dwLowDateTime);
419 // Converts from 100ns units in 1601 epoch to unix epoch in sec
420 return naNum((t * 1e-7) - 11644473600.0);
424 do { t = time(0); gettimeofday(&td, 0); } while(t != time(0));
425 return naNum(t + 1e-6 * td.tv_usec);
429 // Convert a cartesian point to a geodetic lat/lon/altitude.
430 static naRef f_carttogeod(naContext c, naRef me, int argc, naRef* args)
432 double lat, lon, alt, xyz[3];
433 if(argc != 3) naRuntimeError(c, "carttogeod() expects 3 arguments");
434 for(int i=0; i<3; i++)
435 xyz[i] = naNumValue(args[i]).num;
436 sgCartToGeod(xyz, &lat, &lon, &alt);
437 lat *= SG_RADIANS_TO_DEGREES;
438 lon *= SG_RADIANS_TO_DEGREES;
439 naRef vec = naNewVector(c);
440 naVec_append(vec, naNum(lat));
441 naVec_append(vec, naNum(lon));
442 naVec_append(vec, naNum(alt));
446 // Convert a geodetic lat/lon/altitude to a cartesian point.
447 static naRef f_geodtocart(naContext c, naRef me, int argc, naRef* args)
449 if(argc != 3) naRuntimeError(c, "geodtocart() expects 3 arguments");
450 double lat = naNumValue(args[0]).num * SG_DEGREES_TO_RADIANS;
451 double lon = naNumValue(args[1]).num * SG_DEGREES_TO_RADIANS;
452 double alt = naNumValue(args[2]).num;
454 sgGeodToCart(lat, lon, alt, xyz);
455 naRef vec = naNewVector(c);
456 naVec_append(vec, naNum(xyz[0]));
457 naVec_append(vec, naNum(xyz[1]));
458 naVec_append(vec, naNum(xyz[2]));
462 // For given geodetic point return array with elevation, and a material data
463 // hash, or nil if there's no information available (tile not loaded). If
464 // information about the material isn't available, then nil is returned instead
466 static naRef f_geodinfo(naContext c, naRef me, int argc, naRef* args)
468 #define HASHSET(s,l,n) naHash_set(matdata, naStr_fromdata(naNewString(c),s,l),n)
469 if(argc < 2 || argc > 3)
470 naRuntimeError(c, "geodinfo() expects 2 or 3 arguments: lat, lon [, maxalt]");
471 double lat = naNumValue(args[0]).num;
472 double lon = naNumValue(args[1]).num;
473 double elev = argc == 3 ? naNumValue(args[2]).num : 10000;
474 const SGMaterial *mat;
475 SGGeod geod = SGGeod::fromDegM(lon, lat, elev);
476 if(!globals->get_scenery()->get_elevation_m(geod, elev, &mat))
478 naRef vec = naNewVector(c);
479 naVec_append(vec, naNum(elev));
480 naRef matdata = naNil();
482 matdata = naNewHash(c);
483 naRef names = naNewVector(c);
484 const vector<string> n = mat->get_names();
485 for(unsigned int i=0; i<n.size(); i++)
486 naVec_append(names, naStr_fromdata(naNewString(c),
487 const_cast<char*>(n[i].c_str()), n[i].size()));
488 HASHSET("names", 5, names);
489 HASHSET("solid", 5, naNum(mat->get_solid()));
490 HASHSET("friction_factor", 15, naNum(mat->get_friction_factor()));
491 HASHSET("rolling_friction", 16, naNum(mat->get_rolling_friction()));
492 HASHSET("load_resistance", 15, naNum(mat->get_load_resistance()));
493 HASHSET("bumpiness", 9, naNum(mat->get_bumpiness()));
494 HASHSET("light_coverage", 14, naNum(mat->get_light_coverage()));
496 naVec_append(vec, matdata);
502 class AirportInfoFilter : public FGAirport::AirportFilter
505 AirportInfoFilter() : type(FGPositioned::AIRPORT) {
508 virtual FGPositioned::Type minType() const {
512 virtual FGPositioned::Type maxType() const {
516 FGPositioned::Type type;
519 // Returns data hash for particular or nearest airport of a <type>, or nil
522 // airportinfo(<id>); e.g. "KSFO"
523 // airportinfo(<type>); type := ("airport"|"seaport"|"heliport")
524 // airportinfo() same as airportinfo("airport")
525 // airportinfo(<lat>, <lon> [, <type>]);
526 static naRef f_airportinfo(naContext c, naRef me, int argc, naRef* args)
528 static SGConstPropertyNode_ptr latn = fgGetNode("/position/latitude-deg", true);
529 static SGConstPropertyNode_ptr lonn = fgGetNode("/position/longitude-deg", true);
531 FGAirport* apt = NULL;
533 if(argc >= 2 && naIsNum(args[0]) && naIsNum(args[1])) {
534 pos = SGGeod::fromDeg(args[1].num, args[0].num);
538 pos = SGGeod::fromDeg(lonn->getDoubleValue(), latn->getDoubleValue());
541 double maxRange = 10000.0; // expose this? or pick a smaller value?
543 AirportInfoFilter filter; // defaults to airports only
546 // fall through and use AIRPORT
547 } else if(argc == 1 && naIsString(args[0])) {
548 const char *s = naStr_data(args[0]);
549 if(!strcmp(s, "airport")) filter.type = FGPositioned::AIRPORT;
550 else if(!strcmp(s, "seaport")) filter.type = FGPositioned::SEAPORT;
551 else if(!strcmp(s, "heliport")) filter.type = FGPositioned::HELIPORT;
553 // user provided an <id>, hopefully
554 apt = FGAirport::findByIdent(s);
556 naRuntimeError(c, "airportinfo() couldn't find airport: %s", s);
561 naRuntimeError(c, "airportinfo() with invalid function arguments");
566 apt = FGAirport::findClosest(pos, maxRange, &filter);
567 if(!apt) return naNil();
570 string id = apt->ident();
571 string name = apt->name();
574 naRef rwys = naNewHash(c);
575 for(unsigned int r=0; r<apt->numRunways(); ++r) {
576 FGRunway* rwy(apt->getRunwayByIndex(r));
578 naRef rwyid = naStr_fromdata(naNewString(c),
579 const_cast<char *>(rwy->ident().c_str()),
580 rwy->ident().length());
582 naRef rwydata = naNewHash(c);
583 #define HASHSET(s,l,n) naHash_set(rwydata, naStr_fromdata(naNewString(c),s,l),n)
584 HASHSET("id", 2, rwyid);
585 HASHSET("lat", 3, naNum(rwy->latitude()));
586 HASHSET("lon", 3, naNum(rwy->longitude()));
587 HASHSET("heading", 7, naNum(rwy->headingDeg()));
588 HASHSET("length", 6, naNum(rwy->lengthM()));
589 HASHSET("width", 5, naNum(rwy->widthM()));
590 HASHSET("threshold", 9, naNum(rwy->displacedThresholdM()));
591 HASHSET("stopway", 7, naNum(rwy->stopwayM()));
593 naHash_set(rwys, rwyid, rwydata);
597 naRef aptdata = naNewHash(c);
598 #define HASHSET(s,l,n) naHash_set(aptdata, naStr_fromdata(naNewString(c),s,l),n)
599 HASHSET("id", 2, naStr_fromdata(naNewString(c),
600 const_cast<char *>(id.c_str()), id.length()));
601 HASHSET("name", 4, naStr_fromdata(naNewString(c),
602 const_cast<char *>(name.c_str()), name.length()));
603 HASHSET("lat", 3, naNum(apt->getLatitude()));
604 HASHSET("lon", 3, naNum(apt->getLongitude()));
605 HASHSET("elevation", 9, naNum(apt->getElevation() * SG_FEET_TO_METER));
606 HASHSET("has_metar", 9, naNum(apt->getMetar()));
607 HASHSET("runways", 7, rwys);
613 // Table of extension functions. Terminate with zeros.
614 static struct { const char* name; naCFunction func; } funcs[] = {
615 { "getprop", f_getprop },
616 { "setprop", f_setprop },
617 { "print", f_print },
618 { "_fgcommand", f_fgcommand },
619 { "settimer", f_settimer },
620 { "_setlistener", f_setlistener },
621 { "removelistener", f_removelistener },
622 { "_cmdarg", f_cmdarg },
623 { "_interpolate", f_interpolate },
625 { "srand", f_srand },
626 { "abort", f_abort },
627 { "directory", f_directory },
628 { "parsexml", f_parsexml },
629 { "systime", f_systime },
630 { "carttogeod", f_carttogeod },
631 { "geodtocart", f_geodtocart },
632 { "geodinfo", f_geodinfo },
633 { "airportinfo", f_airportinfo },
637 naRef FGNasalSys::cmdArgGhost()
639 return propNodeGhost(_cmdArg);
642 void FGNasalSys::init()
646 _context = naNewContext();
648 // Start with globals. Add it to itself as a recursive
649 // sub-reference under the name "globals". This gives client-code
650 // write access to the namespace if someone wants to do something
652 _globals = naInit_std(_context);
653 naSave(_context, _globals);
654 hashset(_globals, "globals", _globals);
656 hashset(_globals, "math", naInit_math(_context));
657 hashset(_globals, "bits", naInit_bits(_context));
658 hashset(_globals, "io", naInit_io(_context));
659 hashset(_globals, "thread", naInit_thread(_context));
660 hashset(_globals, "utf8", naInit_utf8(_context));
662 // Add our custom extension functions:
663 for(i=0; funcs[i].name; i++)
664 hashset(_globals, funcs[i].name,
665 naNewFunc(_context, naNewCCode(_context, funcs[i].func)));
667 // And our SGPropertyNode wrapper
668 hashset(_globals, "props", genPropsModule());
670 // Make a "__gcsave" hash to hold the naRef objects which get
671 // passed to handles outside the interpreter (to protect them from
672 // begin garbage-collected).
673 _gcHash = naNewHash(_context);
674 hashset(_globals, "__gcsave", _gcHash);
676 // Now load the various source files in the Nasal directory
677 SGPath p(globals->get_fg_root());
680 ulDir* dir = ulOpenDir(p.c_str());
681 while(dir && (dent = ulReadDir(dir)) != 0) {
683 fullpath.append(dent->d_name);
684 SGPath file(dent->d_name);
685 if(file.extension() != "nas") continue;
686 loadModule(fullpath, file.base().c_str());
690 // set signal and remove node to avoid restoring at reinit
691 const char *s = "nasal-dir-initialized";
692 SGPropertyNode *signal = fgGetNode("/sim/signals", true);
693 signal->setBoolValue(s, true);
694 signal->removeChildren(s, false);
696 // Pull scripts out of the property tree, too
697 loadPropertyScripts();
700 void FGNasalSys::update(double)
702 if(!_dead_listener.empty()) {
703 vector<FGNasalListener *>::iterator it, end = _dead_listener.end();
704 for(it = _dead_listener.begin(); it != end; ++it) delete *it;
705 _dead_listener.clear();
708 // The global context is a legacy thing. We use dynamically
709 // created contexts for naCall() now, so that we can call them
710 // recursively. But there are still spots that want to use it for
711 // naNew*() calls, which end up leaking memory because the context
712 // only clears out its temporary vector when it's *used*. So just
713 // junk it and fetch a new/reinitialized one every frame. This is
714 // clumsy: the right solution would use the dynamic context in all
715 // cases and eliminate _context entirely. But that's more work,
716 // and this works fine (yes, they say "New" and "Free", but
717 // they're very fast, just trust me). -Andy
718 naFreeContext(_context);
719 _context = naNewContext();
722 // Loads the scripts found under /nasal in the global tree
723 void FGNasalSys::loadPropertyScripts()
725 SGPropertyNode* nasal = globals->get_props()->getNode("nasal");
728 for(int i=0; i<nasal->nChildren(); i++) {
729 SGPropertyNode* n = nasal->getChild(i);
731 const char* module = n->getName();
732 if(n->hasChild("module"))
733 module = n->getStringValue("module");
735 // allow multiple files to be specified within a single
739 bool file_specified = false;
740 while((fn = n->getChild("file", j)) != NULL) {
741 file_specified = true;
742 const char* file = fn->getStringValue();
743 SGPath p(globals->get_fg_root());
745 loadModule(p, module);
749 const char* src = n->getStringValue("script");
750 if(!n->hasChild("script")) src = 0; // Hrm...
752 createModule(module, n->getPath(), src, strlen(src));
754 if(!file_specified && !src)
755 SG_LOG(SG_NASAL, SG_ALERT, "Nasal error: " <<
756 "no <file> or <script> defined in " <<
757 "/nasal/" << module);
761 // Logs a runtime error, with stack trace, to the FlightGear log stream
762 void FGNasalSys::logError(naContext context)
764 SG_LOG(SG_NASAL, SG_ALERT,
765 "Nasal runtime error: " << naGetError(context));
766 SG_LOG(SG_NASAL, SG_ALERT,
767 " at " << naStr_data(naGetSourceFile(context, 0)) <<
768 ", line " << naGetLine(context, 0));
769 for(int i=1; i<naStackDepth(context); i++)
770 SG_LOG(SG_NASAL, SG_ALERT,
771 " called from: " << naStr_data(naGetSourceFile(context, i)) <<
772 ", line " << naGetLine(context, i));
775 // Reads a script file, executes it, and places the resulting
776 // namespace into the global namespace under the specified module
778 void FGNasalSys::loadModule(SGPath file, const char* module)
781 char* buf = readfile(file.c_str(), &len);
783 SG_LOG(SG_NASAL, SG_ALERT,
784 "Nasal error: could not read script file " << file.c_str()
785 << " into module " << module);
789 createModule(module, file.c_str(), buf, len);
793 // Parse and run. Save the local variables namespace, as it will
794 // become a sub-object of globals. The optional "arg" argument can be
795 // used to pass an associated property node to the module, which can then
796 // be accessed via cmdarg(). (This is, for example, used by XML dialogs.)
797 void FGNasalSys::createModule(const char* moduleName, const char* fileName,
798 const char* src, int len,
799 const SGPropertyNode* cmdarg,
800 int argc, naRef* args)
802 naRef code = parse(fileName, src, len);
806 // See if we already have a module hash to use. This allows the
807 // user to, for example, add functions to the built-in math
808 // module. Make a new one if necessary.
810 naRef modname = naNewString(_context);
811 naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
812 if(!naHash_get(_globals, modname, &locals))
813 locals = naNewHash(_context);
815 _cmdArg = (SGPropertyNode*)cmdarg;
817 call(code, argc, args, locals);
818 hashset(_globals, moduleName, locals);
821 void FGNasalSys::deleteModule(const char* moduleName)
823 naRef modname = naNewString(_context);
824 naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
825 naHash_delete(_globals, modname);
828 naRef FGNasalSys::parse(const char* filename, const char* buf, int len)
831 naRef srcfile = naNewString(_context);
832 naStr_fromdata(srcfile, (char*)filename, strlen(filename));
833 naRef code = naParseCode(_context, srcfile, 1, (char*)buf, len, &errLine);
835 SG_LOG(SG_NASAL, SG_ALERT,
836 "Nasal parse error: " << naGetError(_context) <<
837 " in "<< filename <<", line " << errLine);
841 // Bind to the global namespace before returning
842 return naBindFunction(_context, code, _globals);
845 bool FGNasalSys::handleCommand(const SGPropertyNode* arg)
847 const char* nasal = arg->getStringValue("script");
848 const char* moduleName = arg->getStringValue("module");
849 naRef code = parse(arg->getPath(true), nasal, strlen(nasal));
850 if(naIsNil(code)) return false;
852 // Commands can be run "in" a module. Make sure that module
853 // exists, and set it up as the local variables hash for the
855 naRef locals = naNil();
857 naRef modname = naNewString(_context);
858 naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
859 if(!naHash_get(_globals, modname, &locals)) {
860 locals = naNewHash(_context);
861 naHash_set(_globals, modname, locals);
865 // Cache this command's argument for inspection via cmdarg(). For
866 // performance reasons, we won't bother with it if the invoked
867 // code doesn't need it.
868 _cmdArg = (SGPropertyNode*)arg;
870 call(code, 0, 0, locals);
874 // settimer(func, dt, simtime) extension function. The first argument
875 // is a Nasal function to call, the second is a delta time (from now),
876 // in seconds. The third, if present, is a boolean value indicating
877 // that "real world" time (rather than simulator time) is to be used.
879 // Implementation note: the FGTimer objects don't live inside the
880 // garbage collector, so the Nasal handler functions have to be
881 // "saved" somehow lest they be inadvertently cleaned. In this case,
882 // they are inserted into a globals.__gcsave hash and removed on
884 void FGNasalSys::setTimer(naContext c, int argc, naRef* args)
886 // Extract the handler, delta, and simtime arguments:
887 naRef handler = argc > 0 ? args[0] : naNil();
888 if(!(naIsCode(handler) || naIsCCode(handler) || naIsFunc(handler))) {
889 naRuntimeError(c, "settimer() with invalid function argument");
893 naRef delta = argc > 1 ? args[1] : naNil();
895 naRuntimeError(c, "settimer() with invalid time argument");
899 bool simtime = (argc > 2 && naTrue(args[2])) ? false : true;
901 // Generate and register a C++ timer handler
902 NasalTimer* t = new NasalTimer;
903 t->handler = handler;
904 t->gcKey = gcSave(handler);
907 globals->get_event_mgr()->addEvent("NasalTimer",
908 t, &NasalTimer::timerExpired,
912 void FGNasalSys::handleTimer(NasalTimer* t)
914 call(t->handler, 0, 0, naNil());
918 int FGNasalSys::gcSave(naRef r)
920 int key = _nextGCKey++;
921 naHash_set(_gcHash, naNum(key), r);
925 void FGNasalSys::gcRelease(int key)
927 naHash_delete(_gcHash, naNum(key));
930 void FGNasalSys::NasalTimer::timerExpired()
932 nasal->handleTimer(this);
936 int FGNasalSys::_listenerId = 0;
938 // setlistener(<property>, <func> [, <initial=0> [, <persistent=1>]])
939 // Attaches a callback function to a property (specified as a global
940 // property path string or a SGPropertyNode_ptr* ghost). If the third,
941 // optional argument (default=0) is set to 1, then the function is also
942 // called initially. If the fourth, optional argument is set to 0, then the
943 // function is only called when the property node value actually changes.
944 // Otherwise it's called independent of the value whenever the node is
945 // written to (default). The setlistener() function returns a unique
946 // id number, which is to be used as argument to the removelistener()
948 naRef FGNasalSys::setListener(naContext c, int argc, naRef* args)
950 SGPropertyNode_ptr node;
951 naRef prop = argc > 0 ? args[0] : naNil();
952 if(naIsString(prop)) node = fgGetNode(naStr_data(prop), true);
953 else if(naIsGhost(prop)) node = *(SGPropertyNode_ptr*)naGhost_ptr(prop);
955 naRuntimeError(c, "setlistener() with invalid property argument");
960 SG_LOG(SG_NASAL, SG_DEBUG, "Attaching listener to tied property " <<
963 naRef code = argc > 1 ? args[1] : naNil();
964 if(!(naIsCode(code) || naIsCCode(code) || naIsFunc(code))) {
965 naRuntimeError(c, "setlistener() with invalid function argument");
969 int init = argc > 2 && naIsNum(args[2]) ? int(args[2].num) : 0;
970 int type = argc > 3 && naIsNum(args[3]) ? int(args[3].num) : 1;
971 FGNasalListener *nl = new FGNasalListener(node, code, this,
972 gcSave(code), _listenerId, init, type);
974 node->addChangeListener(nl, init);
976 _listener[_listenerId] = nl;
977 return naNum(_listenerId++);
980 // removelistener(int) extension function. The argument is the id of
981 // a listener as returned by the setlistener() function.
982 naRef FGNasalSys::removeListener(naContext c, int argc, naRef* args)
984 naRef id = argc > 0 ? args[0] : naNil();
985 map<int, FGNasalListener *>::iterator it = _listener.find(int(id.num));
987 if(!naIsNum(id) || it == _listener.end() || it->second->_dead) {
988 naRuntimeError(c, "removelistener() with invalid listener id");
992 it->second->_dead = true;
993 _dead_listener.push_back(it->second);
995 return naNum(_listener.size());
1000 // FGNasalListener class.
1002 FGNasalListener::FGNasalListener(SGPropertyNode *node, naRef code,
1003 FGNasalSys* nasal, int key, int id,
1004 int init, int type) :
1017 if(_type == 0 && !_init)
1021 FGNasalListener::~FGNasalListener()
1023 _node->removeChangeListener(this);
1024 _nas->gcRelease(_gcKey);
1027 void FGNasalListener::call(SGPropertyNode* which, naRef mode)
1029 if(_active || _dead) return;
1030 SG_LOG(SG_NASAL, SG_DEBUG, "trigger listener #" << _id);
1033 arg[0] = _nas->propNodeGhost(which);
1034 arg[1] = _nas->propNodeGhost(_node);
1035 arg[2] = mode; // value changed, child added/removed
1036 arg[3] = naNum(_node != which); // child event?
1037 _nas->call(_code, 4, arg, naNil());
1041 void FGNasalListener::valueChanged(SGPropertyNode* node)
1043 if(_type < 2 && node != _node) return; // skip child events
1044 if(_type > 0 || changed(_node) || _init)
1045 call(node, naNum(0));
1050 void FGNasalListener::childAdded(SGPropertyNode*, SGPropertyNode* child)
1052 if(_type == 2) call(child, naNum(1));
1055 void FGNasalListener::childRemoved(SGPropertyNode*, SGPropertyNode* child)
1057 if(_type == 2) call(child, naNum(-1));
1060 bool FGNasalListener::changed(SGPropertyNode* node)
1062 SGPropertyNode::Type type = node->getType();
1063 if(type == SGPropertyNode::NONE) return false;
1064 if(type == SGPropertyNode::UNSPECIFIED) return true;
1068 case SGPropertyNode::BOOL:
1069 case SGPropertyNode::INT:
1070 case SGPropertyNode::LONG:
1072 long l = node->getLongValue();
1073 result = l != _last_int;
1077 case SGPropertyNode::FLOAT:
1078 case SGPropertyNode::DOUBLE:
1080 double d = node->getDoubleValue();
1081 result = d != _last_float;
1087 string s = node->getStringValue();
1088 result = s != _last_string;
1097 // FGNasalModelData class. If sgLoad3DModel() is called with a pointer to
1098 // such a class, then it lets modelLoaded() run the <load> script, and the
1099 // destructor the <unload> script. The latter happens when the model branch
1100 // is removed from the scene graph.
1102 void FGNasalModelData::modelLoaded(const string& path, SGPropertyNode *prop,
1107 SGPropertyNode *nasal = prop->getNode("nasal");
1111 SGPropertyNode *load = nasal->getNode("load");
1112 _unload = nasal->getNode("unload");
1113 if(!load && !_unload)
1118 _module += ':' + _props->getPath();
1119 const char *s = load ? load->getStringValue() : "";
1122 arg[0] = nasalSys->propNodeGhost(_root);
1123 arg[1] = nasalSys->propNodeGhost(prop);
1124 nasalSys->createModule(_module.c_str(), _module.c_str(), s, strlen(s),
1129 FGNasalModelData::~FGNasalModelData()
1135 SG_LOG(SG_NASAL, SG_WARN, "Trying to run an <unload> script "
1136 "without Nasal subsystem present.");
1141 const char *s = _unload->getStringValue();
1142 nasalSys->createModule(_module.c_str(), _module.c_str(), s, strlen(s), _root);
1144 nasalSys->deleteModule(_module.c_str());
1149 // NasalXMLVisitor class: handles EasyXML visitor callback for parsexml()
1151 NasalXMLVisitor::NasalXMLVisitor(naContext c, int argc, naRef* args) :
1152 _c(naSubContext(c)),
1153 _start_element(argc > 1 ? args[1] : naNil()),
1154 _end_element(argc > 2 ? args[2] : naNil()),
1155 _data(argc > 3 ? args[3] : naNil()),
1156 _pi(argc > 4 ? args[4] : naNil())
1160 void NasalXMLVisitor::startElement(const char* tag, const XMLAttributes& a)
1162 if(naIsNil(_start_element)) return;
1163 naRef attr = naNewHash(_c);
1164 for(int i=0; i<a.size(); i++) {
1165 naRef name = make_string(a.getName(i));
1166 naRef value = make_string(a.getValue(i));
1167 naHash_set(attr, name, value);
1169 call(_start_element, 2, make_string(tag), attr);
1172 void NasalXMLVisitor::endElement(const char* tag)
1174 if(!naIsNil(_end_element)) call(_end_element, 1, make_string(tag));
1177 void NasalXMLVisitor::data(const char* str, int len)
1179 if(!naIsNil(_data)) call(_data, 1, make_string(str, len));
1182 void NasalXMLVisitor::pi(const char* target, const char* data)
1184 if(!naIsNil(_pi)) call(_pi, 2, make_string(target), make_string(data));
1187 void NasalXMLVisitor::call(naRef func, int num, naRef a, naRef b)
1192 naCall(_c, func, num, args, naNil(), naNil());
1197 naRef NasalXMLVisitor::make_string(const char* s, int n)
1199 return naStr_fromdata(naNewString(_c), const_cast<char *>(s),
1200 n < 0 ? strlen(s) : n);