+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <Main/fg_props.hxx>
#include "NasalSys.hxx"
-#include "NasalDisplay.hxx"
// Read and return file contents in a single buffer. Note use of
// stat() to get the file size. This is a win32 function, believe it
_globals = naNil();
_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;
-
- naCall(_context, code, 0, 0, naNil(), naNil());
-
- if(!naGetError(_context)) return true;
- logError();
- return false;
+ call(code, naNil());
+ return true;
}
FGNasalScript* FGNasalSys::parseScript(const char* src, const char* name)
static SGPropertyNode* findnode(naContext c, naRef* vec, int len)
{
SGPropertyNode* p = globals->get_props();
- 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;
+ 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;
}
SGPropertyNode* props = globals->get_props();
naRef val = args[argc-1];
- if(naIsString(val)) props->setStringValue(buf, naStr_data(val));
- else props->setDoubleValue(buf, naNumValue(val).num);
+ 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
}
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
return naNil();
}
-// setlistener(func, property) extension function. Falls through to
+// 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");
- nasal->setListener(argc, args);
- return naNil();
+ 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
return naNum(sg_random());
}
-// Wrapper function for screenPrint
-static naRef f_screenPrint(naContext c, naRef me, int argc, naRef* args)
+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 screenPrint()");
- naRef lmsg = args[0];
- FGNasalSys* nasal = (FGNasalSys*)globals->get_subsystem("nasal");
- nasal->screenPrint(naStr_data(lmsg));
- return naNil();
+ 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.
{ "_fgcommand", f_fgcommand },
{ "settimer", f_settimer },
{ "_setlistener", f_setlistener },
+ { "removelistener", f_removelistener },
{ "_cmdarg", f_cmdarg },
{ "_interpolate", f_interpolate },
{ "rand", f_rand },
- { "screenPrint", f_screenPrint },
+ { "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,
if(file.extension() != "nas") continue;
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 *>::iterator it, end = _listener.end();
+ for(it = _listener.end(); --it != end;) {
+ FGNasalListener *nl = it->second;
+ if(nl->_dead) {
+ _listener.erase(it);
+ delete nl;
+ }
+ }
+ }
+}
+
// Loads the scripts found under /nasal in the global tree
void FGNasalSys::loadPropertyScripts()
{
}
// 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
}
// Parse and run. Save the local variables namespace, as it will
-// become a sub-object of globals.
+// 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 char* src, int len, const SGPropertyNode* arg)
{
naRef code = parse(fileName, src, len);
if(naIsNil(code))
if(!naHash_get(_globals, modname, &locals))
locals = naNewHash(_context);
- naCall(_context, code, 0, 0, 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;
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(_context);
+ if(moduleName[0]) {
+ naRef modname = naNewString(c);
naStr_fromdata(modname, (char*)moduleName, strlen(moduleName));
if(!naHash_get(_globals, modname, &locals))
- locals = naNewHash(_context);
+ locals = naNewHash(c);
}
// Cache the command argument for inspection via cmdarg(). For
// performance reasons, we won't bother with it if the invoked
_cmdArg = (SGPropertyNode*)arg;
// Call it!
- naRef result = naCall(_context, code, 0, 0, naNil(), locals);
- if(!naGetError(_context)) return true;
- logError();
- return false;
+ call(code, locals);
+ return true;
}
// settimer(func, dt, simtime) extension function. The first argument
naRef delta = argc > 1 ? args[1] : naNil();
if(naIsNil(delta)) return;
-
+
bool simtime = (argc > 2 && naTrue(args[2])) ? false : true;
// Generate and register a C++ timer handler
void FGNasalSys::handleTimer(NasalTimer* t)
{
- naCall(_context, t->handler, 0, 0, naNil(), naNil());
- if(naGetError(_context))
- logError();
+ call(t->handler, naNil());
gcRelease(t->gcKey);
}
delete this;
}
-// setlistener(property, func) extension function. The first argument
+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.
-void FGNasalSys::setListener(int argc, naRef* args)
+// 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* node;
+ 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;
+ 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;
- node->addChangeListener(new FGNasalListener(handler, this, gcSave(handler)));
+ _active++;
+ _nas->_cmdArg = node;
+ _nas->call(_handler, naNil());
+ _active--;
}
-// functions providing access to the NasalDisplay - used to display text directly on the screen
-void FGNasalSys::screenPrint(const char* src)
+
+
+
+// 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 *)
{
- globals->get_Nasal_display()->RegisterSingleMessage(src, 0);
+ 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());
+}
+
+
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