6 #include <simgear/nasal/nasal.h>
7 #include <simgear/props/props.hxx>
9 #include <Main/globals.hxx>
11 #include "NasalSys.hxx"
13 // Implementation of a Nasal wrapper for the SGPropertyNode class,
14 // using the Nasal "ghost" (er... Garbage collection Handle for
15 // OutSide Thingy) facility.
17 // Note that these functions appear in Nasal with prepended
18 // underscores. They work on the low-level "ghost" objects and aren't
19 // intended for use from user code, but from Nasal code you will find
20 // in props.nas. That is where the Nasal props.Node class is defined,
21 // which provides a saner interface along the lines of SGPropertyNode.
23 static void propNodeGhostDestroy(void* ghost)
25 SGPropertyNode_ptr* prop = (SGPropertyNode_ptr*)ghost;
29 naGhostType PropNodeGhostType = { propNodeGhostDestroy };
31 static naRef propNodeGhostCreate(naContext c, SGPropertyNode* n)
33 if(!n) return naNil();
34 SGPropertyNode_ptr* ghost = new SGPropertyNode_ptr(n);
35 return naNewGhost(c, &PropNodeGhostType, ghost);
38 naRef FGNasalSys::propNodeGhost(SGPropertyNode* handle)
40 return propNodeGhostCreate(_context, handle);
43 #define NASTR(s) s ? naStr_fromdata(naNewString(c),(char*)(s),strlen(s)) : naNil()
46 // Standard header for the extension functions. It turns the "ghost"
47 // found in arg[0] into a SGPropertyNode_ptr*, and then "unwraps" the
48 // vector found in the second argument into a normal-looking args
49 // array. This allows the Nasal handlers to do things like:
50 // Node.getChild = func { _getChild(me.ghost, arg) }
53 if(argc < 2 || !naIsGhost(args[0]) || \
54 naGhost_type(args[0]) != &PropNodeGhostType) \
55 naRuntimeError(c, "bad argument to props function"); \
56 SGPropertyNode_ptr* node = (SGPropertyNode_ptr*)naGhost_ptr(args[0]); \
59 static naRef f_getType(naContext c, naRef me, int argc, naRef* args)
63 switch((*node)->getType()) {
64 case SGPropertyNode::NONE: t = "NONE"; break;
65 case SGPropertyNode::ALIAS: t = "ALIAS"; break;
66 case SGPropertyNode::BOOL: t = "BOOL"; break;
67 case SGPropertyNode::INT: t = "INT"; break;
68 case SGPropertyNode::LONG: t = "LONG"; break;
69 case SGPropertyNode::FLOAT: t = "FLOAT"; break;
70 case SGPropertyNode::DOUBLE: t = "DOUBLE"; break;
71 case SGPropertyNode::STRING: t = "STRING"; break;
72 case SGPropertyNode::UNSPECIFIED: t = "UNSPECIFIED"; break;
77 static naRef f_getAttribute(naContext c, naRef me, int argc, naRef* args)
80 naRef val = naVec_get(argv, 0);
81 char *a = naStr_data(val);
82 SGPropertyNode::Attribute attr;
84 if(!strcmp(a, "read")) attr = SGPropertyNode::READ;
85 else if(!strcmp(a, "write")) attr = SGPropertyNode::WRITE;
86 else if(!strcmp(a, "archive")) attr = SGPropertyNode::ARCHIVE;
87 else if(!strcmp(a, "trace-read")) attr = SGPropertyNode::TRACE_READ;
88 else if(!strcmp(a, "trace-write")) attr = SGPropertyNode::TRACE_WRITE;
89 else if(!strcmp(a, "userarchive")) attr = SGPropertyNode::USERARCHIVE;
90 else if(!strcmp(a, "tied")) {
91 return naNum((*node)->isTied());
93 naRuntimeError(c, "props.getAttribute() with invalid attribute");
96 return naNum((*node)->getAttribute(attr));
99 static naRef f_setAttribute(naContext c, naRef me, int argc, naRef* args)
102 naRef val = naVec_get(argv, 0);
103 char *a = naStr_data(val);
104 SGPropertyNode::Attribute attr;
106 if(!strcmp(a, "read")) attr = SGPropertyNode::READ;
107 else if(!strcmp(a, "write")) attr = SGPropertyNode::WRITE;
108 else if(!strcmp(a, "archive")) attr = SGPropertyNode::ARCHIVE;
109 else if(!strcmp(a, "trace-read")) attr = SGPropertyNode::TRACE_READ;
110 else if(!strcmp(a, "trace-write")) attr = SGPropertyNode::TRACE_WRITE;
111 else if(!strcmp(a, "userarchive")) attr = SGPropertyNode::USERARCHIVE;
113 naRuntimeError(c, "props.setAttribute() with invalid attribute");
116 naRef ret = naNum((*node)->getAttribute(attr));
117 (*node)->setAttribute(attr, naTrue(naVec_get(argv, 1)) ? true : false);
121 static naRef f_getName(naContext c, naRef me, int argc, naRef* args)
124 return NASTR((*node)->getName());
127 static naRef f_getIndex(naContext c, naRef me, int argc, naRef* args)
130 return naNum((*node)->getIndex());
133 static naRef f_getValue(naContext c, naRef me, int argc, naRef* args)
136 switch((*node)->getType()) {
137 case SGPropertyNode::BOOL: case SGPropertyNode::INT:
138 case SGPropertyNode::LONG: case SGPropertyNode::FLOAT:
139 case SGPropertyNode::DOUBLE:
140 return naNum((*node)->getDoubleValue());
141 case SGPropertyNode::STRING:
142 case SGPropertyNode::UNSPECIFIED:
143 return NASTR((*node)->getStringValue());
149 static naRef f_setValue(naContext c, naRef me, int argc, naRef* args)
152 naRef val = naVec_get(argv, 0);
153 if(naIsString(val)) (*node)->setStringValue(naStr_data(val));
155 naRef n = naNumValue(val);
157 naRuntimeError(c, "props.setValue() with non-number");
158 (*node)->setDoubleValue(naNumValue(val).num);
163 static naRef f_setIntValue(naContext c, naRef me, int argc, naRef* args)
167 // int iv = (int)naNumValue(naVec_get(argv, 0)).num;
169 // Junk to pacify the gcc-2.95.3 optimizer:
170 naRef tmp0 = naVec_get(argv, 0);
171 naRef tmp1 = naNumValue(tmp0);
173 naRuntimeError(c, "props.setIntValue() with non-number");
174 double tmp2 = tmp1.num;
177 (*node)->setIntValue(iv);
181 static naRef f_setBoolValue(naContext c, naRef me, int argc, naRef* args)
184 naRef val = naVec_get(argv, 0);
185 (*node)->setBoolValue(naTrue(val) ? true : false);
189 static naRef f_setDoubleValue(naContext c, naRef me, int argc, naRef* args)
192 naRef r = naNumValue(naVec_get(argv, 0));
194 naRuntimeError(c, "props.setDoubleValue() with non-number");
195 (*node)->setDoubleValue(r.num);
199 static naRef f_getParent(naContext c, naRef me, int argc, naRef* args)
202 SGPropertyNode* n = (*node)->getParent();
203 if(!n) return naNil();
204 return propNodeGhostCreate(c, n);
207 static naRef f_getChild(naContext c, naRef me, int argc, naRef* args)
210 naRef child = naVec_get(argv, 0);
211 if(!naIsString(child)) return naNil();
212 naRef idx = naNumValue(naVec_get(argv, 1));
213 bool create = naTrue(naVec_get(argv, 2));
216 if(naIsNil(idx) || !naIsNum(idx)) {
217 n = (*node)->getChild(naStr_data(child), create);
219 n = (*node)->getChild(naStr_data(child), (int)idx.num, create);
221 } catch (const string& err) {
222 naRuntimeError(c, (char *)err.c_str());
225 if(!n) return naNil();
226 return propNodeGhostCreate(c, n);
229 static naRef f_getChildren(naContext c, naRef me, int argc, naRef* args)
232 naRef result = naNewVector(c);
233 if(naIsNil(argv) || naVec_size(argv) == 0) {
235 for(int i=0; i<(*node)->nChildren(); i++)
236 naVec_append(result, propNodeGhostCreate(c, (*node)->getChild(i)));
238 // Get all children of a specified name
239 naRef name = naVec_get(argv, 0);
240 if(!naIsString(name)) return naNil();
242 vector<SGPropertyNode_ptr> children
243 = (*node)->getChildren(naStr_data(name));
244 for(unsigned int i=0; i<children.size(); i++)
245 naVec_append(result, propNodeGhostCreate(c, children[i]));
246 } catch (const string& err) {
247 naRuntimeError(c, (char *)err.c_str());
254 static naRef f_removeChild(naContext c, naRef me, int argc, naRef* args)
257 naRef child = naVec_get(argv, 0);
258 naRef index = naVec_get(argv, 1);
259 if(!naIsString(child) || !naIsNum(index)) return naNil();
261 (*node)->removeChild(naStr_data(child), (int)index.num, false);
262 } catch (const string& err) {
263 naRuntimeError(c, (char *)err.c_str());
268 static naRef f_removeChildren(naContext c, naRef me, int argc, naRef* args)
271 naRef result = naNewVector(c);
272 if(naIsNil(argv) || naVec_size(argv) == 0) {
273 // Remove all children
274 for(int i = (*node)->nChildren() - 1; i >=0; i--)
275 naVec_append(result, propNodeGhostCreate(c, (*node)->removeChild(i)));
277 // Remove all children of a specified name
278 naRef name = naVec_get(argv, 0);
279 if(!naIsString(name)) return naNil();
281 vector<SGPropertyNode_ptr> children
282 = (*node)->removeChildren(naStr_data(name), false);
283 for(unsigned int i=0; i<children.size(); i++)
284 naVec_append(result, propNodeGhostCreate(c, children[i]));
285 } catch (const string& err) {
286 naRuntimeError(c, (char *)err.c_str());
293 static naRef f_getNode(naContext c, naRef me, int argc, naRef* args)
296 naRef path = naVec_get(argv, 0);
297 bool create = naTrue(naVec_get(argv, 1));
298 if(!naIsString(path)) return naNil();
301 n = (*node)->getNode(naStr_data(path), create);
302 } catch (const string& err) {
303 naRuntimeError(c, (char *)err.c_str());
306 return propNodeGhostCreate(c, n);
309 static naRef f_new(naContext c, naRef me, int argc, naRef* args)
311 return propNodeGhostCreate(c, new SGPropertyNode());
314 static naRef f_globals(naContext c, naRef me, int argc, naRef* args)
316 return propNodeGhostCreate(c, globals->get_props());
323 { f_getType, "_getType" },
324 { f_getAttribute, "_getAttribute" },
325 { f_setAttribute, "_setAttribute" },
326 { f_getName, "_getName" },
327 { f_getIndex, "_getIndex" },
328 { f_getValue, "_getValue" },
329 { f_setValue, "_setValue" },
330 { f_setIntValue, "_setIntValue" },
331 { f_setBoolValue, "_setBoolValue" },
332 { f_setDoubleValue, "_setDoubleValue" },
333 { f_getParent, "_getParent" },
334 { f_getChild, "_getChild" },
335 { f_getChildren, "_getChildren" },
336 { f_removeChild, "_removeChild" },
337 { f_removeChildren, "_removeChildren" },
338 { f_getNode, "_getNode" },
340 { f_globals, "_globals" },
344 naRef FGNasalSys::genPropsModule()
346 naRef namespc = naNewHash(_context);
347 for(int i=0; propfuncs[i].name; i++)
348 hashset(namespc, propfuncs[i].name,
349 naNewFunc(_context, naNewCCode(_context, propfuncs[i].func)));