7 # include <sys/time.h> // gettimeofday
12 #include <sys/types.h>
17 #include <simgear/nasal/nasal.h>
18 #include <simgear/props/props.hxx>
19 #include <simgear/math/sg_random.h>
20 #include <simgear/misc/sg_path.hxx>
21 #include <simgear/misc/sg_dir.hxx>
22 #include <simgear/misc/interpolator.hxx>
23 #include <simgear/structure/commands.hxx>
24 #include <simgear/math/sg_geodesy.hxx>
25 #include <simgear/structure/event_mgr.hxx>
27 #include "NasalSys.hxx"
28 #include "NasalPositioned.hxx"
29 #include <Main/globals.hxx>
30 #include <Main/util.hxx>
31 #include <Main/fg_props.hxx>
35 static FGNasalSys* nasalSys = 0;
37 // Listener class for loading Nasal modules on demand
38 class FGNasalModuleListener : public SGPropertyChangeListener
41 FGNasalModuleListener(SGPropertyNode* node);
43 virtual void valueChanged(SGPropertyNode* node);
46 SGPropertyNode_ptr _node;
49 FGNasalModuleListener::FGNasalModuleListener(SGPropertyNode* node) : _node(node)
53 void FGNasalModuleListener::valueChanged(SGPropertyNode*)
55 if (_node->getBoolValue("enabled",false)&&
56 !_node->getBoolValue("loaded",true))
58 nasalSys->loadPropertyScripts(_node);
63 // Read and return file contents in a single buffer. Note use of
64 // stat() to get the file size. This is a win32 function, believe it
65 // or not. :) Note the REALLY IMPORTANT use of the "b" flag to fopen.
66 // Text mode brain damage will kill us if we're trying to do bytewise
68 static char* readfile(const char* file, int* lenOut)
71 if(stat(file, &data) != 0) return 0;
72 FILE* f = fopen(file, "rb");
74 char* buf = new char[data.st_size];
75 *lenOut = fread(buf, 1, data.st_size, f);
77 if(*lenOut != data.st_size) {
78 // Shouldn't happen, but warn anyway since it represents a
79 // platform bug and not a typical runtime error (missing file,
81 SG_LOG(SG_NASAL, SG_ALERT,
82 "ERROR in Nasal initialization: " <<
83 "short count returned from fread() of " << file <<
84 ". Check your C library!");
91 FGNasalSys::FGNasalSys()
97 _nextGCKey = 0; // Any value will do
101 // Does a naCall() in a new context. Wrapped here to make lock
102 // tracking easier. Extension functions are called with the lock, but
103 // we have to release it before making a new naCall(). So rather than
104 // drop the lock in every extension function that might call back into
105 // Nasal, we keep a stack depth counter here and only unlock/lock
106 // around the naCall if it isn't the first one.
107 naRef FGNasalSys::call(naRef code, int argc, naRef* args, naRef locals)
109 naContext ctx = naNewContext();
110 if(_callCount) naModUnlock();
112 naRef result = naCall(ctx, code, argc, args, naNil(), locals);
116 if(_callCount) naModLock();
121 FGNasalSys::~FGNasalSys()
124 map<int, FGNasalListener *>::iterator it, end = _listener.end();
125 for(it = _listener.begin(); it != end; ++it)
128 naFreeContext(_context);
132 bool FGNasalSys::parseAndRun(const char* sourceCode)
134 naRef code = parse("FGNasalSys::parseAndRun()", sourceCode,
138 call(code, 0, 0, naNil());
142 FGNasalScript* FGNasalSys::parseScript(const char* src, const char* name)
144 FGNasalScript* script = new FGNasalScript();
145 script->_gcKey = -1; // important, if we delete it on a parse
146 script->_nas = this; // error, don't clobber a real handle!
150 sprintf(buf, "FGNasalScript@%p", (void *)script);
154 script->_code = parse(name, src, strlen(src));
155 if(naIsNil(script->_code)) {
160 script->_gcKey = gcSave(script->_code);
164 // Utility. Sets a named key in a hash by C string, rather than nasal
166 void FGNasalSys::hashset(naRef hash, const char* key, naRef val)
168 naRef s = naNewString(_context);
169 naStr_fromdata(s, (char*)key, strlen(key));
170 naHash_set(hash, s, val);
173 // The get/setprop functions accept a *list* of strings and walk
174 // through the property tree with them to find the appropriate node.
175 // This allows a Nasal object to hold onto a property path and use it
176 // like a node object, e.g. setprop(ObjRoot, "size-parsecs", 2.02). This
177 // is the utility function that walks the property tree.
178 // Future enhancement: support integer arguments to specify array
180 static SGPropertyNode* findnode(naContext c, naRef* vec, int len)
182 SGPropertyNode* p = globals->get_props();
184 for(int i=0; i<len; i++) {
186 if(!naIsString(a)) return 0;
187 p = p->getNode(naStr_data(a));
190 } catch (const string& err) {
191 naRuntimeError(c, (char *)err.c_str());
197 // getprop() extension function. Concatenates its string arguments as
198 // property names and returns the value of the specified property. Or
199 // nil if it doesn't exist.
200 static naRef f_getprop(naContext c, naRef me, int argc, naRef* args)
202 using namespace simgear;
203 const SGPropertyNode* p = findnode(c, args, argc);
204 if(!p) return naNil();
206 switch(p->getType()) {
207 case props::BOOL: case props::INT:
208 case props::LONG: case props::FLOAT:
211 double dv = p->getDoubleValue();
212 if (osg::isNaN(dv)) {
213 SG_LOG(SG_NASAL, SG_ALERT, "Nasal getprop: property " << p->getPath() << " is NaN");
221 case props::UNSPECIFIED:
223 naRef nastr = naNewString(c);
224 const char* val = p->getStringValue();
225 naStr_fromdata(nastr, (char*)val, strlen(val));
228 case props::ALIAS: // <--- FIXME, recurse?
234 // setprop() extension function. Concatenates its string arguments as
235 // property names and sets the value of the specified property to the
237 static naRef f_setprop(naContext c, naRef me, int argc, naRef* args)
240 char buf[BUFLEN + 1];
244 if(argc < 2) naRuntimeError(c, "setprop() expects at least 2 arguments");
245 for(int i=0; i<argc-1; i++) {
246 naRef s = naStringValue(c, args[i]);
247 if(naIsNil(s)) return naNil();
248 strncpy(p, naStr_data(s), buflen);
250 buflen = BUFLEN - (p - buf);
251 if(i < (argc-2) && buflen > 0) {
257 SGPropertyNode* props = globals->get_props();
258 naRef val = args[argc-1];
261 if(naIsString(val)) result = props->setStringValue(buf, naStr_data(val));
263 naRef n = naNumValue(val);
265 naRuntimeError(c, "setprop() value is not string or number");
267 if (osg::isNaN(n.num)) {
268 naRuntimeError(c, "setprop() passed a NaN");
271 result = props->setDoubleValue(buf, n.num);
273 } catch (const string& err) {
274 naRuntimeError(c, (char *)err.c_str());
276 return naNum(result);
280 // print() extension function. Concatenates and prints its arguments
281 // to the FlightGear log. Uses the highest log level (SG_ALERT), to
282 // make sure it appears. Is there better way to do this?
283 static naRef f_print(naContext c, naRef me, int argc, naRef* args)
287 for(int i=0; i<n; i++) {
288 naRef s = naStringValue(c, args[i]);
289 if(naIsNil(s)) continue;
290 buf += naStr_data(s);
292 SG_LOG(SG_NASAL, SG_ALERT, buf);
293 return naNum(buf.length());
296 // fgcommand() extension function. Executes a named command via the
297 // FlightGear command manager. Takes a single property node name as
299 static naRef f_fgcommand(naContext c, naRef me, int argc, naRef* args)
301 naRef cmd = argc > 0 ? args[0] : naNil();
302 naRef props = argc > 1 ? args[1] : naNil();
303 if(!naIsString(cmd) || (!naIsNil(props) && !naIsGhost(props)))
304 naRuntimeError(c, "bad arguments to fgcommand()");
305 SGPropertyNode_ptr tmp, *node;
307 node = (SGPropertyNode_ptr*)naGhost_ptr(props);
309 tmp = new SGPropertyNode();
312 return naNum(globals->get_commands()->execute(naStr_data(cmd), *node));
315 // settimer(func, dt, simtime) extension function. Falls through to
316 // FGNasalSys::setTimer(). See there for docs.
317 static naRef f_settimer(naContext c, naRef me, int argc, naRef* args)
319 nasalSys->setTimer(c, argc, args);
323 // setlistener(func, property, bool) extension function. Falls through to
324 // FGNasalSys::setListener(). See there for docs.
325 static naRef f_setlistener(naContext c, naRef me, int argc, naRef* args)
327 return nasalSys->setListener(c, argc, args);
330 // removelistener(int) extension function. Falls through to
331 // FGNasalSys::removeListener(). See there for docs.
332 static naRef f_removelistener(naContext c, naRef me, int argc, naRef* args)
334 return nasalSys->removeListener(c, argc, args);
337 // Returns a ghost handle to the argument to the currently executing
339 static naRef f_cmdarg(naContext c, naRef me, int argc, naRef* args)
341 return nasalSys->cmdArgGhost();
344 // Sets up a property interpolation. The first argument is either a
345 // ghost (SGPropertyNode_ptr*) or a string (global property path) to
346 // interpolate. The second argument is a vector of pairs of
347 // value/delta numbers.
348 static naRef f_interpolate(naContext c, naRef me, int argc, naRef* args)
350 SGPropertyNode* node;
351 naRef prop = argc > 0 ? args[0] : naNil();
352 if(naIsString(prop)) node = fgGetNode(naStr_data(prop), true);
353 else if(naIsGhost(prop)) node = *(SGPropertyNode_ptr*)naGhost_ptr(prop);
356 naRef curve = argc > 1 ? args[1] : naNil();
357 if(!naIsVector(curve)) return naNil();
358 int nPoints = naVec_size(curve) / 2;
359 double* values = new double[nPoints];
360 double* deltas = new double[nPoints];
361 for(int i=0; i<nPoints; i++) {
362 values[i] = naNumValue(naVec_get(curve, 2*i)).num;
363 deltas[i] = naNumValue(naVec_get(curve, 2*i+1)).num;
366 ((SGInterpolator*)globals->get_subsystem_mgr()
367 ->get_group(SGSubsystemMgr::INIT)->get_subsystem("interpolator"))
368 ->interpolate(node, nPoints, values, deltas);
375 // This is a better RNG than the one in the default Nasal distribution
376 // (which is based on the C library rand() implementation). It will
378 static naRef f_rand(naContext c, naRef me, int argc, naRef* args)
380 return naNum(sg_random());
383 static naRef f_srand(naContext c, naRef me, int argc, naRef* args)
389 static naRef f_abort(naContext c, naRef me, int argc, naRef* args)
395 // Return an array listing of all files in a directory
396 static naRef f_directory(naContext c, naRef me, int argc, naRef* args)
398 if(argc != 1 || !naIsString(args[0]))
399 naRuntimeError(c, "bad arguments to directory()");
401 simgear::Dir d(SGPath(naStr_data(args[0])));
402 if(!d.exists()) return naNil();
403 naRef result = naNewVector(c);
405 simgear::PathList paths = d.children(simgear::Dir::TYPE_FILE | simgear::Dir::TYPE_DIR);
406 for (unsigned int i=0; i<paths.size(); ++i) {
407 std::string p = paths[i].file();
408 naVec_append(result, naStr_fromdata(naNewString(c), p.c_str(), p.size()));
415 * Given a data path, resolve it in FG_ROOT or an FG_AIRCRFT directory
417 static naRef f_resolveDataPath(naContext c, naRef me, int argc, naRef* args)
419 if(argc != 1 || !naIsString(args[0]))
420 naRuntimeError(c, "bad arguments to resolveDataPath()");
422 SGPath p = globals->resolve_maybe_aircraft_path(naStr_data(args[0]));
423 const char* pdata = p.c_str();
424 return naStr_fromdata(naNewString(c), const_cast<char*>(pdata), strlen(pdata));
428 // parsexml(<path> [, <start-tag> [, <end-tag> [, <data> [, <pi>]]]]);
430 // <path> ... absolute path to an XML file
431 // <start-tag> ... callback function with two args: tag name, attribute hash
432 // <end-tag> ... callback function with one arg: tag name
433 // <data> ... callback function with one arg: data
434 // <pi> ... callback function with two args: target, data
435 // (pi = "processing instruction")
436 // All four callback functions are optional and default to nil.
437 // The function returns nil on error, or the validated file name otherwise.
438 static naRef f_parsexml(naContext c, naRef me, int argc, naRef* args)
440 if(argc < 1 || !naIsString(args[0]))
441 naRuntimeError(c, "parsexml(): path argument missing or not a string");
442 if(argc > 5) argc = 5;
443 for(int i=1; i<argc; i++)
444 if(!(naIsNil(args[i]) || naIsFunc(args[i])))
445 naRuntimeError(c, "parsexml(): callback argument not a function");
447 const char* file = fgValidatePath(naStr_data(args[0]), false);
449 naRuntimeError(c, "parsexml(): reading '%s' denied "
450 "(unauthorized access)", naStr_data(args[0]));
453 std::ifstream input(file);
454 NasalXMLVisitor visitor(c, argc, args);
456 readXML(input, visitor);
457 } catch (const sg_exception& e) {
458 naRuntimeError(c, "parsexml(): file '%s' %s",
459 file, e.getFormattedMessage().c_str());
462 return naStr_fromdata(naNewString(c), const_cast<char*>(file), strlen(file));
465 // Return UNIX epoch time in seconds.
466 static naRef f_systime(naContext c, naRef me, int argc, naRef* args)
470 GetSystemTimeAsFileTime(&ft);
471 double t = (4294967296.0 * ft.dwHighDateTime + ft.dwLowDateTime);
472 // Converts from 100ns units in 1601 epoch to unix epoch in sec
473 return naNum((t * 1e-7) - 11644473600.0);
476 gettimeofday(&td, 0);
477 return naNum(td.tv_sec + 1e-6 * td.tv_usec);
481 // Table of extension functions. Terminate with zeros.
482 static struct { const char* name; naCFunction func; } funcs[] = {
483 { "getprop", f_getprop },
484 { "setprop", f_setprop },
485 { "print", f_print },
486 { "_fgcommand", f_fgcommand },
487 { "settimer", f_settimer },
488 { "_setlistener", f_setlistener },
489 { "removelistener", f_removelistener },
490 { "_cmdarg", f_cmdarg },
491 { "_interpolate", f_interpolate },
493 { "srand", f_srand },
494 { "abort", f_abort },
495 { "directory", f_directory },
496 { "resolvepath", f_resolveDataPath },
497 { "parsexml", f_parsexml },
498 { "systime", f_systime },
502 naRef FGNasalSys::cmdArgGhost()
504 return propNodeGhost(_cmdArg);
507 void FGNasalSys::init()
511 _context = naNewContext();
513 // Start with globals. Add it to itself as a recursive
514 // sub-reference under the name "globals". This gives client-code
515 // write access to the namespace if someone wants to do something
517 _globals = naInit_std(_context);
518 naSave(_context, _globals);
519 hashset(_globals, "globals", _globals);
521 hashset(_globals, "math", naInit_math(_context));
522 hashset(_globals, "bits", naInit_bits(_context));
523 hashset(_globals, "io", naInit_io(_context));
524 hashset(_globals, "thread", naInit_thread(_context));
525 hashset(_globals, "utf8", naInit_utf8(_context));
527 // Add our custom extension functions:
528 for(i=0; funcs[i].name; i++)
529 hashset(_globals, funcs[i].name,
530 naNewFunc(_context, naNewCCode(_context, funcs[i].func)));
532 initNasalPositioned(_globals, _context);
534 // And our SGPropertyNode wrapper
535 hashset(_globals, "props", genPropsModule());
537 // Make a "__gcsave" hash to hold the naRef objects which get
538 // passed to handles outside the interpreter (to protect them from
539 // begin garbage-collected).
540 _gcHash = naNewHash(_context);
541 hashset(_globals, "__gcsave", _gcHash);
543 // Now load the various source files in the Nasal directory
544 simgear::Dir nasalDir(SGPath(globals->get_fg_root(), "Nasal"));
545 loadScriptDirectory(nasalDir);
547 // Add modules in Nasal subdirectories to property tree
548 simgear::PathList directories = nasalDir.children(simgear::Dir::TYPE_DIR+
549 simgear::Dir::NO_DOT_OR_DOTDOT, "");
550 for (unsigned int i=0; i<directories.size(); ++i) {
551 simgear::Dir dir(directories[i]);
552 simgear::PathList scripts = dir.children(simgear::Dir::TYPE_FILE, ".nas");
553 addModule(directories[i].file(), scripts);
556 // set signal and remove node to avoid restoring at reinit
557 const char *s = "nasal-dir-initialized";
558 SGPropertyNode *signal = fgGetNode("/sim/signals", true);
559 signal->setBoolValue(s, true);
560 signal->removeChildren(s, false);
562 // Pull scripts out of the property tree, too
563 loadPropertyScripts();
566 void FGNasalSys::update(double)
568 if(!_dead_listener.empty()) {
569 vector<FGNasalListener *>::iterator it, end = _dead_listener.end();
570 for(it = _dead_listener.begin(); it != end; ++it) delete *it;
571 _dead_listener.clear();
574 if (!_loadList.empty())
576 // process Nasal load hook (only one per update loop to avoid excessive lags)
577 _loadList.pop()->load();
580 if (!_unloadList.empty())
582 // process pending Nasal unload hooks after _all_ load hooks were processed
583 // (only unload one per update loop to avoid excessive lags)
584 _unloadList.pop()->unload();
587 // The global context is a legacy thing. We use dynamically
588 // created contexts for naCall() now, so that we can call them
589 // recursively. But there are still spots that want to use it for
590 // naNew*() calls, which end up leaking memory because the context
591 // only clears out its temporary vector when it's *used*. So just
592 // junk it and fetch a new/reinitialized one every frame. This is
593 // clumsy: the right solution would use the dynamic context in all
594 // cases and eliminate _context entirely. But that's more work,
595 // and this works fine (yes, they say "New" and "Free", but
596 // they're very fast, just trust me). -Andy
597 naFreeContext(_context);
598 _context = naNewContext();
601 bool pathSortPredicate(const SGPath& p1, const SGPath& p2)
603 return p1.file() < p2.file();
606 // Loads all scripts in given directory
607 void FGNasalSys::loadScriptDirectory(simgear::Dir nasalDir)
609 simgear::PathList scripts = nasalDir.children(simgear::Dir::TYPE_FILE, ".nas");
610 // sort scripts, avoid loading sequence effects due to file system's
611 // random directory order
612 std::sort(scripts.begin(), scripts.end(), pathSortPredicate);
614 for (unsigned int i=0; i<scripts.size(); ++i) {
615 SGPath fullpath(scripts[i]);
616 SGPath file = fullpath.file();
617 loadModule(fullpath, file.base().c_str());
621 // Create module with list of scripts
622 void FGNasalSys::addModule(string moduleName, simgear::PathList scripts)
624 if (scripts.size()>0)
626 SGPropertyNode* nasal = globals->get_props()->getNode("nasal");
627 SGPropertyNode* module_node = nasal->getChild(moduleName,0,true);
628 for (unsigned int i=0; i<scripts.size(); ++i) {
629 SGPropertyNode* pFileNode = module_node->getChild("file",i,true);
630 pFileNode->setStringValue(scripts[i].c_str());
632 if (!module_node->hasChild("enabled",0))
634 SGPropertyNode* node = module_node->getChild("enabled",0,true);
635 node->setBoolValue(true);
636 node->setAttribute(SGPropertyNode::USERARCHIVE,true);
641 // Loads the scripts found under /nasal in the global tree
642 void FGNasalSys::loadPropertyScripts()
644 SGPropertyNode* nasal = globals->get_props()->getNode("nasal");
647 for(int i=0; i<nasal->nChildren(); i++)
649 SGPropertyNode* n = nasal->getChild(i);
650 loadPropertyScripts(n);
654 // Loads the scripts found under /nasal in the global tree
655 void FGNasalSys::loadPropertyScripts(SGPropertyNode* n)
657 bool is_loaded = false;
659 const char* module = n->getName();
660 if(n->hasChild("module"))
661 module = n->getStringValue("module");
662 if (n->getBoolValue("enabled",true))
664 // allow multiple files to be specified within a single
668 bool file_specified = false;
670 while((fn = n->getChild("file", j)) != NULL) {
671 file_specified = true;
672 const char* file = fn->getStringValue();
674 if (!p.isAbsolute() || !p.exists())
676 p = globals->resolve_maybe_aircraft_path(file);
679 SG_LOG(SG_NASAL, SG_ALERT, "Cannot find Nasal script '" <<
680 file << "' for module '" << module << "'.");
683 ok &= p.isNull() ? false : loadModule(p, module);
687 const char* src = n->getStringValue("script");
688 if(!n->hasChild("script")) src = 0; // Hrm...
690 createModule(module, n->getPath().c_str(), src, strlen(src));
692 if(!file_specified && !src)
694 // module no longer exists - clear the archived "enable" flag
695 n->setAttribute(SGPropertyNode::USERARCHIVE,false);
696 SGPropertyNode* node = n->getChild("enabled",0,false);
698 node->setAttribute(SGPropertyNode::USERARCHIVE,false);
700 SG_LOG(SG_NASAL, SG_ALERT, "Nasal error: " <<
701 "no <file> or <script> defined in " <<
702 "/nasal/" << module);
709 SGPropertyNode* enable = n->getChild("enabled");
712 FGNasalModuleListener* listener = new FGNasalModuleListener(n);
713 enable->addChangeListener(listener, false);
716 SGPropertyNode* loaded = n->getChild("loaded",0,true);
717 loaded->setAttribute(SGPropertyNode::PRESERVE,true);
718 loaded->setBoolValue(is_loaded);
721 // Logs a runtime error, with stack trace, to the FlightGear log stream
722 void FGNasalSys::logError(naContext context)
724 SG_LOG(SG_NASAL, SG_ALERT,
725 "Nasal runtime error: " << naGetError(context));
726 SG_LOG(SG_NASAL, SG_ALERT,
727 " at " << naStr_data(naGetSourceFile(context, 0)) <<
728 ", line " << naGetLine(context, 0));
729 for(int i=1; i<naStackDepth(context); i++)
730 SG_LOG(SG_NASAL, SG_ALERT,
731 " called from: " << naStr_data(naGetSourceFile(context, i)) <<
732 ", line " << naGetLine(context, i));
735 // Reads a script file, executes it, and places the resulting
736 // namespace into the global namespace under the specified module
738 bool FGNasalSys::loadModule(SGPath file, const char* module)
741 char* buf = readfile(file.c_str(), &len);
743 SG_LOG(SG_NASAL, SG_ALERT,
744 "Nasal error: could not read script file " << file.c_str()
745 << " into module " << module);
749 bool ok = createModule(module, file.c_str(), buf, len);
754 // Parse and run. Save the local variables namespace, as it will
755 // become a sub-object of globals. The optional "arg" argument can be
756 // used to pass an associated property node to the module, which can then
757 // be accessed via cmdarg(). (This is, for example, used by XML dialogs.)
758 bool FGNasalSys::createModule(const char* moduleName, const char* fileName,
759 const char* src, int len,
760 const SGPropertyNode* cmdarg,
761 int argc, naRef* args)
763 naRef code = parse(fileName, src, len);
767 // See if we already have a module hash to use. This allows the
768 // user to, for example, add functions to the built-in math
769 // module. Make a new one if necessary.
771 naRef modname = naNewString(_context);
772 naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
773 if(!naHash_get(_globals, modname, &locals))
774 locals = naNewHash(_context);
776 _cmdArg = (SGPropertyNode*)cmdarg;
778 call(code, argc, args, locals);
779 hashset(_globals, moduleName, locals);
783 void FGNasalSys::deleteModule(const char* moduleName)
785 naRef modname = naNewString(_context);
786 naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
787 naHash_delete(_globals, modname);
790 naRef FGNasalSys::parse(const char* filename, const char* buf, int len)
793 naRef srcfile = naNewString(_context);
794 naStr_fromdata(srcfile, (char*)filename, strlen(filename));
795 naRef code = naParseCode(_context, srcfile, 1, (char*)buf, len, &errLine);
797 SG_LOG(SG_NASAL, SG_ALERT,
798 "Nasal parse error: " << naGetError(_context) <<
799 " in "<< filename <<", line " << errLine);
803 // Bind to the global namespace before returning
804 return naBindFunction(_context, code, _globals);
807 bool FGNasalSys::handleCommand(const SGPropertyNode* arg)
809 const char* nasal = arg->getStringValue("script");
810 const char* moduleName = arg->getStringValue("module");
811 naRef code = parse(arg->getPath(true).c_str(), nasal, strlen(nasal));
812 if(naIsNil(code)) return false;
814 // Commands can be run "in" a module. Make sure that module
815 // exists, and set it up as the local variables hash for the
817 naRef locals = naNil();
819 naRef modname = naNewString(_context);
820 naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
821 if(!naHash_get(_globals, modname, &locals)) {
822 locals = naNewHash(_context);
823 naHash_set(_globals, modname, locals);
827 // Cache this command's argument for inspection via cmdarg(). For
828 // performance reasons, we won't bother with it if the invoked
829 // code doesn't need it.
830 _cmdArg = (SGPropertyNode*)arg;
832 call(code, 0, 0, locals);
836 // settimer(func, dt, simtime) extension function. The first argument
837 // is a Nasal function to call, the second is a delta time (from now),
838 // in seconds. The third, if present, is a boolean value indicating
839 // that "real world" time (rather than simulator time) is to be used.
841 // Implementation note: the FGTimer objects don't live inside the
842 // garbage collector, so the Nasal handler functions have to be
843 // "saved" somehow lest they be inadvertently cleaned. In this case,
844 // they are inserted into a globals.__gcsave hash and removed on
846 void FGNasalSys::setTimer(naContext c, int argc, naRef* args)
848 // Extract the handler, delta, and simtime arguments:
849 naRef handler = argc > 0 ? args[0] : naNil();
850 if(!(naIsCode(handler) || naIsCCode(handler) || naIsFunc(handler))) {
851 naRuntimeError(c, "settimer() with invalid function argument");
855 naRef delta = argc > 1 ? args[1] : naNil();
857 naRuntimeError(c, "settimer() with invalid time argument");
861 bool simtime = (argc > 2 && naTrue(args[2])) ? false : true;
863 // Generate and register a C++ timer handler
864 NasalTimer* t = new NasalTimer;
865 t->handler = handler;
866 t->gcKey = gcSave(handler);
869 globals->get_event_mgr()->addEvent("NasalTimer",
870 t, &NasalTimer::timerExpired,
874 void FGNasalSys::handleTimer(NasalTimer* t)
876 call(t->handler, 0, 0, naNil());
880 int FGNasalSys::gcSave(naRef r)
882 int key = _nextGCKey++;
883 naHash_set(_gcHash, naNum(key), r);
887 void FGNasalSys::gcRelease(int key)
889 naHash_delete(_gcHash, naNum(key));
892 void FGNasalSys::NasalTimer::timerExpired()
894 nasal->handleTimer(this);
898 int FGNasalSys::_listenerId = 0;
900 // setlistener(<property>, <func> [, <initial=0> [, <persistent=1>]])
901 // Attaches a callback function to a property (specified as a global
902 // property path string or a SGPropertyNode_ptr* ghost). If the third,
903 // optional argument (default=0) is set to 1, then the function is also
904 // called initially. If the fourth, optional argument is set to 0, then the
905 // function is only called when the property node value actually changes.
906 // Otherwise it's called independent of the value whenever the node is
907 // written to (default). The setlistener() function returns a unique
908 // id number, which is to be used as argument to the removelistener()
910 naRef FGNasalSys::setListener(naContext c, int argc, naRef* args)
912 SGPropertyNode_ptr node;
913 naRef prop = argc > 0 ? args[0] : naNil();
914 if(naIsString(prop)) node = fgGetNode(naStr_data(prop), true);
915 else if(naIsGhost(prop)) node = *(SGPropertyNode_ptr*)naGhost_ptr(prop);
917 naRuntimeError(c, "setlistener() with invalid property argument");
922 SG_LOG(SG_NASAL, SG_DEBUG, "Attaching listener to tied property " <<
925 naRef code = argc > 1 ? args[1] : naNil();
926 if(!(naIsCode(code) || naIsCCode(code) || naIsFunc(code))) {
927 naRuntimeError(c, "setlistener() with invalid function argument");
931 int init = argc > 2 && naIsNum(args[2]) ? int(args[2].num) : 0;
932 int type = argc > 3 && naIsNum(args[3]) ? int(args[3].num) : 1;
933 FGNasalListener *nl = new FGNasalListener(node, code, this,
934 gcSave(code), _listenerId, init, type);
936 node->addChangeListener(nl, init != 0);
938 _listener[_listenerId] = nl;
939 return naNum(_listenerId++);
942 // removelistener(int) extension function. The argument is the id of
943 // a listener as returned by the setlistener() function.
944 naRef FGNasalSys::removeListener(naContext c, int argc, naRef* args)
946 naRef id = argc > 0 ? args[0] : naNil();
947 map<int, FGNasalListener *>::iterator it = _listener.find(int(id.num));
949 if(!naIsNum(id) || it == _listener.end() || it->second->_dead) {
950 naRuntimeError(c, "removelistener() with invalid listener id");
954 it->second->_dead = true;
955 _dead_listener.push_back(it->second);
957 return naNum(_listener.size());
962 // FGNasalListener class.
964 FGNasalListener::FGNasalListener(SGPropertyNode *node, naRef code,
965 FGNasalSys* nasal, int key, int id,
966 int init, int type) :
979 if(_type == 0 && !_init)
983 FGNasalListener::~FGNasalListener()
985 _node->removeChangeListener(this);
986 _nas->gcRelease(_gcKey);
989 void FGNasalListener::call(SGPropertyNode* which, naRef mode)
991 if(_active || _dead) return;
992 SG_LOG(SG_NASAL, SG_DEBUG, "trigger listener #" << _id);
995 arg[0] = _nas->propNodeGhost(which);
996 arg[1] = _nas->propNodeGhost(_node);
997 arg[2] = mode; // value changed, child added/removed
998 arg[3] = naNum(_node != which); // child event?
999 _nas->call(_code, 4, arg, naNil());
1003 void FGNasalListener::valueChanged(SGPropertyNode* node)
1005 if(_type < 2 && node != _node) return; // skip child events
1006 if(_type > 0 || changed(_node) || _init)
1007 call(node, naNum(0));
1012 void FGNasalListener::childAdded(SGPropertyNode*, SGPropertyNode* child)
1014 if(_type == 2) call(child, naNum(1));
1017 void FGNasalListener::childRemoved(SGPropertyNode*, SGPropertyNode* child)
1019 if(_type == 2) call(child, naNum(-1));
1022 bool FGNasalListener::changed(SGPropertyNode* node)
1024 using namespace simgear;
1025 props::Type type = node->getType();
1026 if(type == props::NONE) return false;
1027 if(type == props::UNSPECIFIED) return true;
1035 long l = node->getLongValue();
1036 result = l != _last_int;
1043 double d = node->getDoubleValue();
1044 result = d != _last_float;
1050 string s = node->getStringValue();
1051 result = s != _last_string;
1060 // FGNasalModelData class. If sgLoad3DModel() is called with a pointer to
1061 // such a class, then it lets modelLoaded() run the <load> script, and the
1062 // destructor the <unload> script. The latter happens when the model branch
1063 // is removed from the scene graph.
1065 unsigned int FGNasalModelData::_module_id = 0;
1067 void FGNasalModelData::load()
1069 std::stringstream m;
1070 m << "__model" << _module_id++;
1073 SG_LOG(SG_NASAL, SG_DEBUG, "Loading nasal module " << _module.c_str());
1075 const char *s = _load ? _load->getStringValue() : "";
1078 arg[0] = nasalSys->propNodeGhost(_root);
1079 arg[1] = nasalSys->propNodeGhost(_prop);
1080 nasalSys->createModule(_module.c_str(), _path.c_str(), s, strlen(s),
1084 void FGNasalModelData::unload()
1086 if (_module.empty())
1090 SG_LOG(SG_NASAL, SG_WARN, "Trying to run an <unload> script "
1091 "without Nasal subsystem present.");
1095 SG_LOG(SG_NASAL, SG_DEBUG, "Unloading nasal module " << _module.c_str());
1099 const char *s = _unload->getStringValue();
1100 nasalSys->createModule(_module.c_str(), _module.c_str(), s, strlen(s), _root);
1103 nasalSys->deleteModule(_module.c_str());
1106 void FGNasalModelDataProxy::modelLoaded(const string& path, SGPropertyNode *prop,
1110 SG_LOG(SG_NASAL, SG_WARN, "Trying to run a <load> script "
1111 "without Nasal subsystem present.");
1118 SGPropertyNode *nasal = prop->getNode("nasal");
1122 SGPropertyNode* load = nasal->getNode("load");
1123 SGPropertyNode* unload = nasal->getNode("unload");
1125 if ((!load) && (!unload))
1128 _data = new FGNasalModelData(_root, path, prop, load, unload);
1130 // register Nasal module to be created and loaded in the main thread.
1131 nasalSys->registerToLoad(_data);
1134 FGNasalModelDataProxy::~FGNasalModelDataProxy()
1136 // when necessary, register Nasal module to be destroyed/unloaded
1137 // in the main thread.
1138 if ((_data.valid())&&(nasalSys))
1139 nasalSys->registerToUnload(_data);
1142 // NasalXMLVisitor class: handles EasyXML visitor callback for parsexml()
1144 NasalXMLVisitor::NasalXMLVisitor(naContext c, int argc, naRef* args) :
1145 _c(naSubContext(c)),
1146 _start_element(argc > 1 ? args[1] : naNil()),
1147 _end_element(argc > 2 ? args[2] : naNil()),
1148 _data(argc > 3 ? args[3] : naNil()),
1149 _pi(argc > 4 ? args[4] : naNil())
1153 void NasalXMLVisitor::startElement(const char* tag, const XMLAttributes& a)
1155 if(naIsNil(_start_element)) return;
1156 naRef attr = naNewHash(_c);
1157 for(int i=0; i<a.size(); i++) {
1158 naRef name = make_string(a.getName(i));
1159 naRef value = make_string(a.getValue(i));
1160 naHash_set(attr, name, value);
1162 call(_start_element, 2, make_string(tag), attr);
1165 void NasalXMLVisitor::endElement(const char* tag)
1167 if(!naIsNil(_end_element)) call(_end_element, 1, make_string(tag));
1170 void NasalXMLVisitor::data(const char* str, int len)
1172 if(!naIsNil(_data)) call(_data, 1, make_string(str, len));
1175 void NasalXMLVisitor::pi(const char* target, const char* data)
1177 if(!naIsNil(_pi)) call(_pi, 2, make_string(target), make_string(data));
1180 void NasalXMLVisitor::call(naRef func, int num, naRef a, naRef b)
1185 naCall(_c, func, num, args, naNil(), naNil());
1190 naRef NasalXMLVisitor::make_string(const char* s, int n)
1192 return naStr_fromdata(naNewString(_c), const_cast<char *>(s),
1193 n < 0 ? strlen(s) : n);