+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <simgear/nasal/nasal.h>
#include <simgear/props/props.hxx>
+#include <simgear/math/sg_random.h>
#include <simgear/misc/sg_path.hxx>
+#include <simgear/misc/interpolator.hxx>
#include <simgear/structure/commands.hxx>
#include <Main/globals.hxx>
+#include <Main/fg_props.hxx>
#include "NasalSys.hxx"
{
_context = 0;
_globals = naNil();
- _timerHash = naNil();
- _nextTimerHashKey = 0; // Any value will do
+ _gcHash = naNil();
+ _nextGCKey = 0; // Any value will do
+ _callCount = 0;
+ _purgeListeners = false;
+}
+
+// Does a naCall() in a new context. Wrapped here to make lock
+// tracking easier. Extension functions are called with the lock, but
+// we have to release it before making a new naCall(). So rather than
+// drop the lock in every extension function that might call back into
+// Nasal, we keep a stack depth counter here and only unlock/lock
+// around the naCall if it isn't the first one.
+naRef FGNasalSys::call(naRef code, naRef locals)
+{
+ naContext ctx = naNewContext();
+ if(_callCount) naModUnlock();
+ _callCount++;
+ naRef result = naCall(ctx, code, 0, 0, naNil(), locals);
+ if(naGetError(ctx))
+ logError(ctx);
+ _callCount--;
+ if(_callCount) naModLock();
+ naFreeContext(ctx);
+ return result;
}
FGNasalSys::~FGNasalSys()
{
+ map<int, FGNasalListener *>::iterator it, end = _listener.end();
+ for(it = _listener.begin(); it != end; ++it)
+ delete it->second;
+
// Nasal doesn't have a "destroy context" API yet. :(
// Not a problem for a global subsystem that will never be
// destroyed. And the context is actually a global, so no memory
strlen(sourceCode));
if(naIsNil(code))
return false;
+ call(code, naNil());
+ return true;
+}
+
+FGNasalScript* FGNasalSys::parseScript(const char* src, const char* name)
+{
+ FGNasalScript* script = new FGNasalScript();
+ script->_gcKey = -1; // important, if we delete it on a parse
+ script->_nas = this; // error, don't clobber a real handle!
+
+ char buf[256];
+ if(!name) {
+ sprintf(buf, "FGNasalScript@%p", script);
+ name = buf;
+ }
- naCall(_context, code, naNil(), naNil(), naNil());
+ script->_code = parse(name, src, strlen(src));
+ if(naIsNil(script->_code)) {
+ delete script;
+ return 0;
+ }
- if(!naGetError(_context)) return true;
- logError();
- return false;
+ script->_gcKey = gcSave(script->_code);
+ return script;
}
// Utility. Sets a named key in a hash by C string, rather than nasal
// is the utility function that walks the property tree.
// Future enhancement: support integer arguments to specify array
// elements.
-static SGPropertyNode* findnode(naContext c, naRef vec, int len)
+static SGPropertyNode* findnode(naContext c, naRef* vec, int len)
{
SGPropertyNode* p = globals->get_props();
- for(int i=0; i<len; i++) {
- naRef a = naVec_get(vec, i);
- if(!naIsString(a)) return 0;
- p = p->getNode(naStr_data(a));
- if(p == 0) return 0;
+ try {
+ for(int i=0; i<len; i++) {
+ naRef a = vec[i];
+ if(!naIsString(a)) return 0;
+ p = p->getNode(naStr_data(a));
+ if(p == 0) return 0;
+ }
+ } catch (const string& err) {
+ naRuntimeError(c, (char *)err.c_str());
+ return 0;
}
return p;
}
// getprop() extension function. Concatenates its string arguments as
// property names and returns the value of the specified property. Or
// nil if it doesn't exist.
-static naRef f_getprop(naContext c, naRef args)
+static naRef f_getprop(naContext c, naRef me, int argc, naRef* args)
{
- const SGPropertyNode* p = findnode(c, args, naVec_size(args));
+ const SGPropertyNode* p = findnode(c, args, argc);
if(!p) return naNil();
switch(p->getType()) {
return naNum(p->getDoubleValue());
case SGPropertyNode::STRING:
+ case SGPropertyNode::UNSPECIFIED:
{
naRef nastr = naNewString(c);
const char* val = p->getStringValue();
naStr_fromdata(nastr, (char*)val, strlen(val));
return nastr;
}
+ case SGPropertyNode::ALIAS: // <--- FIXME, recurse?
default:
return naNil();
}
// setprop() extension function. Concatenates its string arguments as
// property names and sets the value of the specified property to the
// final argument.
-static naRef f_setprop(naContext c, naRef args)
+static naRef f_setprop(naContext c, naRef me, int argc, naRef* args)
{
#define BUFLEN 1024
- int argc = naVec_size(args);
char buf[BUFLEN + 1];
buf[BUFLEN] = 0;
char* p = buf;
int buflen = BUFLEN;
for(int i=0; i<argc-1; i++) {
- naRef s = naStringValue(c, naVec_get(args, i));
+ naRef s = naStringValue(c, args[i]);
if(naIsNil(s)) return naNil();
strncpy(p, naStr_data(s), buflen);
p += naStr_len(s);
}
SGPropertyNode* props = globals->get_props();
- naRef val = naVec_get(args, argc-1);
- if(naIsString(val)) props->setStringValue(buf, naStr_data(val));
- else props->setDoubleValue(buf, naNumValue(val).num);
+ naRef val = args[argc-1];
+ try {
+ if(naIsString(val)) props->setStringValue(buf, naStr_data(val));
+ else {
+ naRef n = naNumValue(val);
+ if(naIsNil(n))
+ naRuntimeError(c, "setprop() value is not string or number");
+ props->setDoubleValue(buf, n.num);
+ }
+ } catch (const string& err) {
+ naRuntimeError(c, (char *)err.c_str());
+ }
return naNil();
#undef BUFLEN
}
// print() extension function. Concatenates and prints its arguments
// to the FlightGear log. Uses the highest log level (SG_ALERT), to
// make sure it appears. Is there better way to do this?
-static naRef f_print(naContext c, naRef args)
+static naRef f_print(naContext c, naRef me, int argc, naRef* args)
{
-#define BUFLEN 1024
- char buf[BUFLEN + 1];
- buf[BUFLEN] = 0; // extra nul to handle strncpy brain damage
- char* p = buf;
- int buflen = BUFLEN;
- int n = naVec_size(args);
+ string buf;
+ int n = argc;
for(int i=0; i<n; i++) {
- naRef s = naStringValue(c, naVec_get(args, i));
+ naRef s = naStringValue(c, args[i]);
if(naIsNil(s)) continue;
- strncpy(p, naStr_data(s), buflen);
- p += naStr_len(s);
- buflen = BUFLEN - (p - buf);
- if(buflen <= 0) break;
+ buf += naStr_data(s);
}
SG_LOG(SG_GENERAL, SG_ALERT, buf);
- return naNil();
-#undef BUFLEN
+ return naNum(buf.length());
}
// fgcommand() extension function. Executes a named command via the
// FlightGear command manager. Takes a single property node name as
// an argument.
-static naRef f_fgcommand(naContext c, naRef args)
+static naRef f_fgcommand(naContext c, naRef me, int argc, naRef* args)
{
- naRef cmd = naVec_get(args, 0);
- naRef props = naVec_get(args, 1);
- if(!naIsString(cmd) || !naIsGhost(props)) return naNil();
+ if(argc < 2 || !naIsString(args[0]) || !naIsGhost(args[1]))
+ naRuntimeError(c, "bad arguments to fgcommand()");
+ naRef cmd = args[0], props = args[1];
SGPropertyNode_ptr* node = (SGPropertyNode_ptr*)naGhost_ptr(props);
- globals->get_commands()->execute(naStr_data(cmd), *node);
- return naNil();
-
+ return naNum(globals->get_commands()->execute(naStr_data(cmd), *node));
}
// settimer(func, dt, simtime) extension function. Falls through to
// FGNasalSys::setTimer(). See there for docs.
-static naRef f_settimer(naContext c, naRef args)
+static naRef f_settimer(naContext c, naRef me, int argc, naRef* args)
{
FGNasalSys* nasal = (FGNasalSys*)globals->get_subsystem("nasal");
- nasal->setTimer(args);
+ nasal->setTimer(argc, args);
return naNil();
}
+// setlistener(func, property, bool) extension function. Falls through to
+// FGNasalSys::setListener(). See there for docs.
+static naRef f_setlistener(naContext c, naRef me, int argc, naRef* args)
+{
+ FGNasalSys* nasal = (FGNasalSys*)globals->get_subsystem("nasal");
+ return nasal->setListener(argc, args);
+}
+
+// removelistener(int) extension function. Falls through to
+// FGNasalSys::removeListener(). See there for docs.
+static naRef f_removelistener(naContext c, naRef me, int argc, naRef* args)
+{
+ FGNasalSys* nasal = (FGNasalSys*)globals->get_subsystem("nasal");
+ return nasal->removeListener(c, argc, args);
+}
+
// Returns a ghost handle to the argument to the currently executing
// command
-static naRef f_cmdarg(naContext c, naRef args)
+static naRef f_cmdarg(naContext c, naRef me, int argc, naRef* args)
{
FGNasalSys* nasal = (FGNasalSys*)globals->get_subsystem("nasal");
return nasal->cmdArgGhost();
}
+// Sets up a property interpolation. The first argument is either a
+// ghost (SGPropertyNode_ptr*) or a string (global property path) to
+// interpolate. The second argument is a vector of pairs of
+// value/delta numbers.
+static naRef f_interpolate(naContext c, naRef me, int argc, naRef* args)
+{
+ SGPropertyNode* node;
+ naRef prop = argc > 0 ? args[0] : naNil();
+ if(naIsString(prop)) node = fgGetNode(naStr_data(prop), true);
+ else if(naIsGhost(prop)) node = *(SGPropertyNode_ptr*)naGhost_ptr(prop);
+ else return naNil();
+
+ naRef curve = argc > 1 ? args[1] : naNil();
+ if(!naIsVector(curve)) return naNil();
+ int nPoints = naVec_size(curve) / 2;
+ double* values = new double[nPoints];
+ double* deltas = new double[nPoints];
+ for(int i=0; i<nPoints; i++) {
+ values[i] = naNumValue(naVec_get(curve, 2*i)).num;
+ deltas[i] = naNumValue(naVec_get(curve, 2*i+1)).num;
+ }
+
+ ((SGInterpolator*)globals->get_subsystem("interpolator"))
+ ->interpolate(node, nPoints, values, deltas);
+
+ return naNil();
+}
+
+// This is a better RNG than the one in the default Nasal distribution
+// (which is based on the C library rand() implementation). It will
+// override.
+static naRef f_rand(naContext c, naRef me, int argc, naRef* args)
+{
+ return naNum(sg_random());
+}
+
+static naRef f_srand(naContext c, naRef me, int argc, naRef* args)
+{
+ sg_srandom_time();
+ return naNum(0);
+}
+
+// Return an array listing of all files in a directory
+static naRef f_directory(naContext c, naRef me, int argc, naRef* args)
+{
+ if(argc != 1 || !naIsString(args[0]))
+ naRuntimeError(c, "bad arguments to directory()");
+ naRef ldir = args[0];
+ ulDir* dir = ulOpenDir(naStr_data(args[0]));
+ if(!dir) return naNil();
+ naRef result = naNewVector(c);
+ ulDirEnt* dent;
+ while((dent = ulReadDir(dir)))
+ naVec_append(result, naStr_fromdata(naNewString(c), dent->d_name,
+ strlen(dent->d_name)));
+ ulCloseDir(dir);
+ return result;
+}
+
// Table of extension functions. Terminate with zeros.
static struct { char* name; naCFunction func; } funcs[] = {
{ "getprop", f_getprop },
{ "print", f_print },
{ "_fgcommand", f_fgcommand },
{ "settimer", f_settimer },
+ { "_setlistener", f_setlistener },
+ { "removelistener", f_removelistener },
{ "_cmdarg", f_cmdarg },
+ { "_interpolate", f_interpolate },
+ { "rand", f_rand },
+ { "srand", f_srand },
+ { "directory", f_directory },
{ 0, 0 }
};
// Add in the math library under "math"
hashset(_globals, "math", naMathLib(_context));
+ // Add in the IO library. Disabled currently until after the
+ // 0.9.10 release.
+ // hashset(_globals, "io", naIOLib(_context));
+ // hashset(_globals, "bits", naBitsLib(_context));
+
// Add our custom extension functions:
for(i=0; funcs[i].name; i++)
hashset(_globals, funcs[i].name,
// And our SGPropertyNode wrapper
hashset(_globals, "props", genPropsModule());
- // Make a "__timers" hash to hold the settimer() handlers (to
- // protect them from begin garbage-collected).
- _timerHash = naNewHash(_context);
- hashset(_globals, "__timers", _timerHash);
+ // Make a "__gcsave" hash to hold the naRef objects which get
+ // passed to handles outside the interpreter (to protect them from
+ // begin garbage-collected).
+ _gcHash = naNewHash(_context);
+ hashset(_globals, "__gcsave", _gcHash);
// Now load the various source files in the Nasal directory
SGPath p(globals->get_fg_root());
fullpath.append(dent->d_name);
SGPath file(dent->d_name);
if(file.extension() != "nas") continue;
- readScriptFile(fullpath, file.base().c_str());
+ loadModule(fullpath, file.base().c_str());
}
+ ulCloseDir(dir);
+
+ // set signal and remove node to avoid restoring at reinit
+ const char *s = "nasal-dir-initialized";
+ SGPropertyNode *signal = fgGetNode("/sim/signals", true);
+ signal->setBoolValue(s, true);
+ signal->removeChildren(s);
// Pull scripts out of the property tree, too
loadPropertyScripts();
}
+void FGNasalSys::update(double)
+{
+ if(_purgeListeners) {
+ _purgeListeners = false;
+ map<int, FGNasalListener *>::reverse_iterator it, eit;
+ map<int, FGNasalListener *>::reverse_iterator end = _listener.rend();
+ for(it = _listener.rbegin(); it != end; ) {
+ eit = it++;
+ FGNasalListener *nl = eit->second;
+ if(nl->_dead) {
+ _listener.erase((++eit).base());
+ delete nl;
+ }
+ }
+ }
+}
+
// Loads the scripts found under /nasal in the global tree
void FGNasalSys::loadPropertyScripts()
{
if(n->hasChild("module"))
module = n->getStringValue("module");
+ // allow multiple files to be specified within in a single
+ // Nasal module tag
+ int j = 0;
+ SGPropertyNode *fn;
+ bool file_specified = false;
+ while ( (fn = n->getChild("file", j)) != NULL ) {
+ file_specified = true;
+ const char* file = fn->getStringValue();
+ SGPath p(globals->get_fg_root());
+ p.append(file);
+ loadModule(p, module);
+ j++;
+ }
+
+ // Old code which only allowed a single file to be specified per module
+ /*
const char* file = n->getStringValue("file");
if(!n->hasChild("file")) file = 0; // Hrm...
if(file) {
SGPath p(globals->get_fg_root());
p.append(file);
- readScriptFile(p, module);
+ loadModule(p, module);
}
+ */
const char* src = n->getStringValue("script");
if(!n->hasChild("script")) src = 0; // Hrm...
if(src)
- initModule(module, n->getPath(), src, strlen(src));
+ createModule(module, n->getPath(), src, strlen(src));
- if(!file && !src)
+ if(!file_specified && !src)
SG_LOG(SG_NASAL, SG_ALERT, "Nasal error: " <<
"no <file> or <script> defined in " <<
"/nasal/" << module);
}
// Logs a runtime error, with stack trace, to the FlightGear log stream
-void FGNasalSys::logError()
+void FGNasalSys::logError(naContext context)
{
SG_LOG(SG_NASAL, SG_ALERT,
- "Nasal runtime error: " << naGetError(_context));
+ "Nasal runtime error: " << naGetError(context));
SG_LOG(SG_NASAL, SG_ALERT,
- " at " << naStr_data(naGetSourceFile(_context, 0)) <<
- ", line " << naGetLine(_context, 0));
- for(int i=1; i<naStackDepth(_context); i++)
+ " at " << naStr_data(naGetSourceFile(context, 0)) <<
+ ", line " << naGetLine(context, 0));
+ for(int i=1; i<naStackDepth(context); i++)
SG_LOG(SG_NASAL, SG_ALERT,
- " called from: " << naStr_data(naGetSourceFile(_context, i)) <<
- ", line " << naGetLine(_context, i));
+ " called from: " << naStr_data(naGetSourceFile(context, i)) <<
+ ", line " << naGetLine(context, i));
}
// Reads a script file, executes it, and places the resulting
// namespace into the global namespace under the specified module
// name.
-void FGNasalSys::readScriptFile(SGPath file, const char* module)
+void FGNasalSys::loadModule(SGPath file, const char* module)
{
int len = 0;
char* buf = readfile(file.c_str(), &len);
return;
}
- initModule(module, file.c_str(), buf, len);
+ createModule(module, file.c_str(), buf, len);
delete[] buf;
}
// Parse and run. Save the local variables namespace, as it will
-// become a sub-object of globals.
-void FGNasalSys::initModule(const char* moduleName, const char* fileName,
- const char* src, int len)
+// become a sub-object of globals. The optional "arg" argument can be
+// used to pass an associated property node to the module, which can then
+// be accessed via cmdarg(). (This is, for example, used by XML dialogs.)
+void FGNasalSys::createModule(const char* moduleName, const char* fileName,
+ const char* src, int len, const SGPropertyNode* arg)
{
- if(len == 0) len = strlen(src);
-
naRef code = parse(fileName, src, len);
if(naIsNil(code))
return;
if(!naHash_get(_globals, modname, &locals))
locals = naNewHash(_context);
- naCall(_context, code, naNil(), naNil(), locals);
- if(naGetError(_context)) {
- logError();
- return;
- }
+ _cmdArg = (SGPropertyNode*)arg;
+
+ call(code, locals);
hashset(_globals, moduleName, locals);
}
+void FGNasalSys::deleteModule(const char* moduleName)
+{
+ naRef modname = naNewString(_context);
+ naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
+ naHash_delete(_globals, modname);
+}
+
naRef FGNasalSys::parse(const char* filename, const char* buf, int len)
{
int errLine = -1;
bool FGNasalSys::handleCommand(const SGPropertyNode* arg)
{
- // Parse the Nasal source. I'd love to use the property name of
- // the argument, but it's actually a *clone* of the original
- // location in the property tree. arg->getPath() returns an empty
- // string.
const char* nasal = arg->getStringValue("script");
- naRef code = parse("<command>", nasal, strlen(nasal));
+ const char* moduleName = arg->getStringValue("module");
+ naRef code = parse(arg->getPath(true), nasal, strlen(nasal));
if(naIsNil(code)) return false;
-
+
+ naContext c = naNewContext();
+ naRef locals = naNil();
+ if(moduleName[0]) {
+ naRef modname = naNewString(c);
+ naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
+ if(!naHash_get(_globals, modname, &locals))
+ locals = naNewHash(c);
+ }
// Cache the command argument for inspection via cmdarg(). For
// performance reasons, we won't bother with it if the invoked
// code doesn't need it.
_cmdArg = (SGPropertyNode*)arg;
// Call it!
- naRef result = naCall(_context, code, naNil(), naNil(), naNil());
- if(!naGetError(_context)) return true;
- logError();
- return false;
+ call(code, locals);
+ return true;
}
// settimer(func, dt, simtime) extension function. The first argument
// is a Nasal function to call, the second is a delta time (from now),
// in seconds. The third, if present, is a boolean value indicating
-// that "simulator" time (rather than real time) is to be used.
+// that "real world" time (rather than simulator time) is to be used.
//
// Implementation note: the FGTimer objects don't live inside the
// garbage collector, so the Nasal handler functions have to be
// "saved" somehow lest they be inadvertently cleaned. In this case,
-// they are inserted into a globals._timers hash and removed on
+// they are inserted into a globals.__gcsave hash and removed on
// expiration.
-void FGNasalSys::setTimer(naRef args)
+void FGNasalSys::setTimer(int argc, naRef* args)
{
// Extract the handler, delta, and simtime arguments:
- naRef handler = naVec_get(args, 0);
+ naRef handler = argc > 0 ? args[0] : naNil();
if(!(naIsCode(handler) || naIsCCode(handler) || naIsFunc(handler)))
return;
- naRef delta = naNumValue(naVec_get(args, 1));
+ naRef delta = argc > 1 ? args[1] : naNil();
if(naIsNil(delta)) return;
-
- bool simtime = naTrue(naVec_get(args, 2)) ? true : false;
+
+ bool simtime = (argc > 2 && naTrue(args[2])) ? false : true;
// Generate and register a C++ timer handler
NasalTimer* t = new NasalTimer;
t->handler = handler;
- t->hashKey = _nextTimerHashKey++;
+ t->gcKey = gcSave(handler);
t->nasal = this;
globals->get_event_mgr()->addEvent("NasalTimer",
t, &NasalTimer::timerExpired,
delta.num, simtime);
+}
+void FGNasalSys::handleTimer(NasalTimer* t)
+{
+ call(t->handler, naNil());
+ gcRelease(t->gcKey);
+}
- // Save the handler in the globals.__timers hash to prevent
- // garbage collection.
- naHash_set(_timerHash, naNum(t->hashKey), handler);
+int FGNasalSys::gcSave(naRef r)
+{
+ int key = _nextGCKey++;
+ naHash_set(_gcHash, naNum(key), r);
+ return key;
}
-void FGNasalSys::handleTimer(NasalTimer* t)
+void FGNasalSys::gcRelease(int key)
{
- naCall(_context, t->handler, naNil(), naNil(), naNil());
- naHash_delete(_timerHash, naNum(t->hashKey));
+ naHash_delete(_gcHash, naNum(key));
}
void FGNasalSys::NasalTimer::timerExpired()
nasal->handleTimer(this);
delete this;
}
+
+int FGNasalSys::_listenerId = 0;
+
+// setlistener(property, func, bool) extension function. The first argument
+// is either a ghost (SGPropertyNode_ptr*) or a string (global property
+// path), the second is a Nasal function, the optional third one a bool.
+// If the bool is true, then the listener is executed initially. The
+// setlistener() function returns a unique id number, that can be used
+// as argument to the removelistener() function.
+naRef FGNasalSys::setListener(int argc, naRef* args)
+{
+ SGPropertyNode_ptr node;
+ naRef prop = argc > 0 ? args[0] : naNil();
+ if(naIsString(prop)) node = fgGetNode(naStr_data(prop), true);
+ else if(naIsGhost(prop)) node = *(SGPropertyNode_ptr*)naGhost_ptr(prop);
+ else return naNil();
+
+ if(node->isTied())
+ SG_LOG(SG_NASAL, SG_DEBUG, "Attaching listener to tied property " <<
+ node->getPath());
+
+ naRef handler = argc > 1 ? args[1] : naNil();
+ if(!(naIsCode(handler) || naIsCCode(handler) || naIsFunc(handler)))
+ return naNil();
+
+ bool initial = argc > 2 && naTrue(args[2]);
+
+ FGNasalListener *nl = new FGNasalListener(node, handler, this,
+ gcSave(handler));
+ node->addChangeListener(nl, initial);
+
+ _listener[_listenerId] = nl;
+ return naNum(_listenerId++);
+}
+
+// removelistener(int) extension function. The argument is the id of
+// a listener as returned by the setlistener() function.
+naRef FGNasalSys::removeListener(naContext c, int argc, naRef* args)
+{
+ naRef id = argc > 0 ? args[0] : naNil();
+ map<int, FGNasalListener *>::iterator it = _listener.find(int(id.num));
+
+ if(!naIsNum(id) || it == _listener.end() || it->second->_dead) {
+ naRuntimeError(c, "removelistener() with invalid listener id");
+ return naNil();
+ }
+
+ FGNasalListener *nl = it->second;
+ if(nl->_active) {
+ nl->_dead = true;
+ _purgeListeners = true;
+ return naNum(-1);
+ }
+
+ _listener.erase(it);
+ delete nl;
+ return naNum(_listener.size());
+}
+
+
+
+// FGNasalListener class.
+
+FGNasalListener::FGNasalListener(SGPropertyNode_ptr node, naRef handler,
+ FGNasalSys* nasal, int key) :
+ _node(node),
+ _handler(handler),
+ _gcKey(key),
+ _nas(nasal),
+ _active(0),
+ _dead(false)
+{
+}
+
+FGNasalListener::~FGNasalListener()
+{
+ _node->removeChangeListener(this);
+ _nas->gcRelease(_gcKey);
+}
+
+void FGNasalListener::valueChanged(SGPropertyNode* node)
+{
+ // drop recursive listener calls
+ if(_active || _dead)
+ return;
+
+ _active++;
+ _nas->_cmdArg = node;
+ _nas->call(_handler, naNil());
+ _active--;
+}
+
+
+
+
+// FGNasalModelData class. If sgLoad3DModel() is called with a pointer to
+// such a class, then it lets modelLoaded() run the <load> script, and the
+// destructor the <unload> script. The latter happens when the model branch
+// is removed from the scene graph.
+
+void FGNasalModelData::modelLoaded(const string& path, SGPropertyNode *prop,
+ osg::Node *)
+{
+ SGPropertyNode *n = prop->getNode("nasal"), *load;
+ if(!n)
+ return;
+
+ load = n->getNode("load");
+ _unload = n->getNode("unload");
+ if(!load && !_unload)
+ return;
+
+ _module = path;
+ const char *s = load ? load->getStringValue() : "";
+ FGNasalSys *nas = (FGNasalSys *)globals->get_subsystem("nasal");
+ nas->createModule(_module.c_str(), _module.c_str(), s, strlen(s));
+}
+
+FGNasalModelData::~FGNasalModelData()
+{
+ if(_module.empty())
+ return;
+
+ FGNasalSys *nas = (FGNasalSys *)globals->get_subsystem("nasal");
+ if(!nas) {
+ SG_LOG(SG_NASAL, SG_ALERT, "Trying to run an <unload> script "
+ "without Nasal subsystem present.");
+ return;
+ }
+
+ if(_unload) {
+ const char *s = _unload->getStringValue();
+ nas->createModule(_module.c_str(), _module.c_str(), s, strlen(s));
+ }
+ nas->deleteModule(_module.c_str());
+}
+
+
projects / flightgear.git / blobdiff