8 #include <simgear/math/SGMath.hxx>
9 #include <simgear/nasal/nasal.h>
10 #include <simgear/props/props.hxx>
12 #include <Main/globals.hxx>
14 #include "NasalSys.hxx"
18 // Implementation of a Nasal wrapper for the SGPropertyNode class,
19 // using the Nasal "ghost" (er... Garbage collection Handle for
20 // OutSide Thingy) facility.
22 // Note that these functions appear in Nasal with prepended
23 // underscores. They work on the low-level "ghost" objects and aren't
24 // intended for use from user code, but from Nasal code you will find
25 // in props.nas. That is where the Nasal props.Node class is defined,
26 // which provides a saner interface along the lines of SGPropertyNode.
28 static void propNodeGhostDestroy(void* ghost)
30 SGPropertyNode_ptr* prop = (SGPropertyNode_ptr*)ghost;
34 naGhostType PropNodeGhostType = { propNodeGhostDestroy, "prop" };
36 static naRef propNodeGhostCreate(naContext c, SGPropertyNode* n)
38 if(!n) return naNil();
39 SGPropertyNode_ptr* ghost = new SGPropertyNode_ptr(n);
40 return naNewGhost(c, &PropNodeGhostType, ghost);
43 naRef FGNasalSys::propNodeGhost(SGPropertyNode* handle)
45 return propNodeGhostCreate(_context, handle);
48 #define NASTR(s) s ? naStr_fromdata(naNewString(c),(char*)(s),strlen(s)) : naNil()
51 // Standard header for the extension functions. It turns the "ghost"
52 // found in arg[0] into a SGPropertyNode_ptr*, and then "unwraps" the
53 // vector found in the second argument into a normal-looking args
54 // array. This allows the Nasal handlers to do things like:
55 // Node.getChild = func { _getChild(me.ghost, arg) }
58 if(argc < 2 || !naIsGhost(args[0]) || \
59 naGhost_type(args[0]) != &PropNodeGhostType) \
60 naRuntimeError(c, "bad argument to props function"); \
61 SGPropertyNode_ptr* node = (SGPropertyNode_ptr*)naGhost_ptr(args[0]); \
64 static naRef f_getType(naContext c, naRef me, int argc, naRef* args)
66 using namespace simgear;
68 const char* t = "unknown";
69 switch((*node)->getType()) {
70 case props::NONE: t = "NONE"; break;
71 case props::ALIAS: t = "ALIAS"; break;
72 case props::BOOL: t = "BOOL"; break;
73 case props::INT: t = "INT"; break;
74 case props::LONG: t = "LONG"; break;
75 case props::FLOAT: t = "FLOAT"; break;
76 case props::DOUBLE: t = "DOUBLE"; break;
77 case props::STRING: t = "STRING"; break;
78 case props::UNSPECIFIED: t = "UNSPECIFIED"; break;
79 case props::VEC3D: t = "VEC3D"; break;
80 case props::VEC4D: t = "VEC4D"; break;
81 case props::EXTENDED: t = "EXTENDED"; break; // shouldn't happen
86 static naRef f_getAttribute(naContext c, naRef me, int argc, naRef* args)
89 if(naVec_size(argv) == 0) return naNum(unsigned((*node)->getAttributes()));
90 naRef val = naVec_get(argv, 0);
91 const char *a = naStr_data(val);
92 SGPropertyNode::Attribute attr;
94 if(!strcmp(a, "last")) return naNum(SGPropertyNode::LAST_USED_ATTRIBUTE);
95 else if(!strcmp(a, "children")) return naNum((*node)->nChildren());
96 else if(!strcmp(a, "listeners")) return naNum((*node)->nListeners());
97 else if(!strcmp(a, "references")) return naNum(node->getNumRefs());
98 else if(!strcmp(a, "tied")) return naNum((*node)->isTied());
99 else if(!strcmp(a, "alias")) return naNum((*node)->isAlias());
100 else if(!strcmp(a, "readable")) attr = SGPropertyNode::READ;
101 else if(!strcmp(a, "writable")) attr = SGPropertyNode::WRITE;
102 else if(!strcmp(a, "archive")) attr = SGPropertyNode::ARCHIVE;
103 else if(!strcmp(a, "trace-read")) attr = SGPropertyNode::TRACE_READ;
104 else if(!strcmp(a, "trace-write")) attr = SGPropertyNode::TRACE_WRITE;
105 else if(!strcmp(a, "userarchive")) attr = SGPropertyNode::USERARCHIVE;
106 else if(!strcmp(a, "preserve")) attr = SGPropertyNode::PRESERVE;
108 naRuntimeError(c, "props.getAttribute() with invalid attribute");
111 return naNum((*node)->getAttribute(attr));
114 static naRef f_setAttribute(naContext c, naRef me, int argc, naRef* args)
117 naRef val = naVec_get(argv, 0);
118 if(naVec_size(argv) == 1 && naIsNum(val)) {
119 naRef ret = naNum((*node)->getAttributes());
120 (*node)->setAttributes((int)val.num);
123 SGPropertyNode::Attribute attr;
124 const char *a = naStr_data(val);
126 if(!strcmp(a, "readable")) attr = SGPropertyNode::READ;
127 else if(!strcmp(a, "writable")) attr = SGPropertyNode::WRITE;
128 else if(!strcmp(a, "archive")) attr = SGPropertyNode::ARCHIVE;
129 else if(!strcmp(a, "trace-read")) attr = SGPropertyNode::TRACE_READ;
130 else if(!strcmp(a, "trace-write")) attr = SGPropertyNode::TRACE_WRITE;
131 else if(!strcmp(a, "userarchive")) attr = SGPropertyNode::USERARCHIVE;
132 else if(!strcmp(a, "preserve")) attr = SGPropertyNode::PRESERVE;
134 naRuntimeError(c, "props.setAttribute() with invalid attribute");
137 naRef ret = naNum((*node)->getAttribute(attr));
138 (*node)->setAttribute(attr, naTrue(naVec_get(argv, 1)) ? true : false);
142 static naRef f_getName(naContext c, naRef me, int argc, naRef* args)
145 return NASTR((*node)->getName());
148 static naRef f_getIndex(naContext c, naRef me, int argc, naRef* args)
151 return naNum((*node)->getIndex());
155 naRef makeVectorFromVec(naContext c, const T& vec)
157 const int num_components
158 = sizeof(vec.data()) / sizeof(typename T::value_type);
159 naRef vector = naNewVector(c);
160 naVec_setsize(c, vector, num_components);
161 for (int i = 0; i < num_components; ++i)
162 naVec_set(vector, i, naNum(vec[i]));
166 static naRef f_getValue(naContext c, naRef me, int argc, naRef* args)
168 using namespace simgear;
170 switch((*node)->getType()) {
171 case props::BOOL: case props::INT:
172 case props::LONG: case props::FLOAT:
175 double dv = (*node)->getDoubleValue();
176 if (osg::isNaN(dv)) {
177 SG_LOG(SG_NASAL, SG_ALERT, "Nasal getValue: property " << (*node)->getPath() << " is NaN");
185 case props::UNSPECIFIED:
186 return NASTR((*node)->getStringValue());
188 return makeVectorFromVec(c, (*node)->getValue<SGVec3d>());
190 return makeVectorFromVec(c, (*node)->getValue<SGVec4d>());
197 T makeVecFromVector(naRef vector)
200 const int num_components
201 = sizeof(vec.data()) / sizeof(typename T::value_type);
202 int size = naVec_size(vector);
204 for (int i = 0; i < num_components && i < size; ++i) {
205 naRef element = naVec_get(vector, i);
206 naRef n = naNumValue(element);
213 static naRef f_setValue(naContext c, naRef me, int argc, naRef* args)
216 naRef val = naVec_get(argv, 0);
218 if(naIsString(val)) {
219 result = (*node)->setStringValue(naStr_data(val));
220 } else if(naIsVector(val)) {
221 if(naVec_size(val) == 3)
222 result = (*node)->setValue(makeVecFromVector<SGVec3d>(val));
223 else if(naVec_size(val) == 4)
224 result = (*node)->setValue(makeVecFromVector<SGVec4d>(val));
226 naRuntimeError(c, "props.setValue() vector value has wrong size");
228 naRef n = naNumValue(val);
230 naRuntimeError(c, "props.setValue() with non-number");
232 double d = naNumValue(val).num;
234 naRuntimeError(c, "props.setValue() passed a NaN");
237 result = (*node)->setDoubleValue(d);
239 return naNum(result);
242 static naRef f_setIntValue(naContext c, naRef me, int argc, naRef* args)
246 // int iv = (int)naNumValue(naVec_get(argv, 0)).num;
248 // Junk to pacify the gcc-2.95.3 optimizer:
249 naRef tmp0 = naVec_get(argv, 0);
250 naRef tmp1 = naNumValue(tmp0);
252 naRuntimeError(c, "props.setIntValue() with non-number");
253 double tmp2 = tmp1.num;
256 return naNum((*node)->setIntValue(iv));
259 static naRef f_setBoolValue(naContext c, naRef me, int argc, naRef* args)
262 naRef val = naVec_get(argv, 0);
263 return naNum((*node)->setBoolValue(naTrue(val) ? true : false));
266 static naRef f_setDoubleValue(naContext c, naRef me, int argc, naRef* args)
269 naRef r = naNumValue(naVec_get(argv, 0));
271 naRuntimeError(c, "props.setDoubleValue() with non-number");
273 if (osg::isNaN(r.num)) {
274 naRuntimeError(c, "props.setDoubleValue() passed a NaN");
277 return naNum((*node)->setDoubleValue(r.num));
280 static naRef f_getParent(naContext c, naRef me, int argc, naRef* args)
283 SGPropertyNode* n = (*node)->getParent();
284 if(!n) return naNil();
285 return propNodeGhostCreate(c, n);
288 static naRef f_getChild(naContext c, naRef me, int argc, naRef* args)
291 naRef child = naVec_get(argv, 0);
292 if(!naIsString(child)) return naNil();
293 naRef idx = naNumValue(naVec_get(argv, 1));
294 bool create = naTrue(naVec_get(argv, 2));
297 if(naIsNil(idx) || !naIsNum(idx)) {
298 n = (*node)->getChild(naStr_data(child), create);
300 n = (*node)->getChild(naStr_data(child), (int)idx.num, create);
302 } catch (const string& err) {
303 naRuntimeError(c, (char *)err.c_str());
306 if(!n) return naNil();
307 return propNodeGhostCreate(c, n);
310 static naRef f_getChildren(naContext c, naRef me, int argc, naRef* args)
313 naRef result = naNewVector(c);
314 if(naIsNil(argv) || naVec_size(argv) == 0) {
316 for(int i=0; i<(*node)->nChildren(); i++)
317 naVec_append(result, propNodeGhostCreate(c, (*node)->getChild(i)));
319 // Get all children of a specified name
320 naRef name = naVec_get(argv, 0);
321 if(!naIsString(name)) return naNil();
323 vector<SGPropertyNode_ptr> children
324 = (*node)->getChildren(naStr_data(name));
325 for(unsigned int i=0; i<children.size(); i++)
326 naVec_append(result, propNodeGhostCreate(c, children[i]));
327 } catch (const string& err) {
328 naRuntimeError(c, (char *)err.c_str());
335 static naRef f_removeChild(naContext c, naRef me, int argc, naRef* args)
338 naRef child = naVec_get(argv, 0);
339 naRef index = naVec_get(argv, 1);
340 if(!naIsString(child) || !naIsNum(index)) return naNil();
341 SGPropertyNode_ptr n = 0;
343 n = (*node)->removeChild(naStr_data(child), (int)index.num, false);
344 } catch (const string& err) {
345 naRuntimeError(c, (char *)err.c_str());
347 return propNodeGhostCreate(c, n);
350 static naRef f_removeChildren(naContext c, naRef me, int argc, naRef* args)
353 naRef result = naNewVector(c);
354 if(naIsNil(argv) || naVec_size(argv) == 0) {
355 // Remove all children
356 for(int i = (*node)->nChildren() - 1; i >=0; i--)
357 naVec_append(result, propNodeGhostCreate(c, (*node)->removeChild(i)));
359 // Remove all children of a specified name
360 naRef name = naVec_get(argv, 0);
361 if(!naIsString(name)) return naNil();
363 vector<SGPropertyNode_ptr> children
364 = (*node)->removeChildren(naStr_data(name), false);
365 for(unsigned int i=0; i<children.size(); i++)
366 naVec_append(result, propNodeGhostCreate(c, children[i]));
367 } catch (const string& err) {
368 naRuntimeError(c, (char *)err.c_str());
375 static naRef f_alias(naContext c, naRef me, int argc, naRef* args)
379 naRef prop = naVec_get(argv, 0);
381 if(naIsString(prop)) al = globals->get_props()->getNode(naStr_data(prop), true);
382 else if(naIsGhost(prop)) al = *(SGPropertyNode_ptr*)naGhost_ptr(prop);
383 else throw string("props.alias() with bad argument");
384 } catch (const string& err) {
385 naRuntimeError(c, (char *)err.c_str());
388 return naNum((*node)->alias(al));
391 static naRef f_unalias(naContext c, naRef me, int argc, naRef* args)
394 return naNum((*node)->unalias());
397 static naRef f_getAliasTarget(naContext c, naRef me, int argc, naRef* args)
400 return propNodeGhostCreate(c, (*node)->getAliasTarget());
403 static naRef f_getNode(naContext c, naRef me, int argc, naRef* args)
406 naRef path = naVec_get(argv, 0);
407 bool create = naTrue(naVec_get(argv, 1));
408 if(!naIsString(path)) return naNil();
411 n = (*node)->getNode(naStr_data(path), create);
412 } catch (const string& err) {
413 naRuntimeError(c, (char *)err.c_str());
416 return propNodeGhostCreate(c, n);
419 static naRef f_new(naContext c, naRef me, int argc, naRef* args)
421 return propNodeGhostCreate(c, new SGPropertyNode());
424 static naRef f_globals(naContext c, naRef me, int argc, naRef* args)
426 return propNodeGhostCreate(c, globals->get_props());
433 { f_getType, "_getType" },
434 { f_getAttribute, "_getAttribute" },
435 { f_setAttribute, "_setAttribute" },
436 { f_getName, "_getName" },
437 { f_getIndex, "_getIndex" },
438 { f_getValue, "_getValue" },
439 { f_setValue, "_setValue" },
440 { f_setIntValue, "_setIntValue" },
441 { f_setBoolValue, "_setBoolValue" },
442 { f_setDoubleValue, "_setDoubleValue" },
443 { f_getParent, "_getParent" },
444 { f_getChild, "_getChild" },
445 { f_getChildren, "_getChildren" },
446 { f_removeChild, "_removeChild" },
447 { f_removeChildren, "_removeChildren" },
448 { f_alias, "_alias" },
449 { f_unalias, "_unalias" },
450 { f_getAliasTarget, "_getAliasTarget" },
451 { f_getNode, "_getNode" },
453 { f_globals, "_globals" },
457 naRef FGNasalSys::genPropsModule()
459 naRef namespc = naNewHash(_context);
460 for(int i=0; propfuncs[i].name; i++)
461 hashset(namespc, propfuncs[i].name,
462 naNewFunc(_context, naNewCCode(_context, propfuncs[i].func)));