269 lines
8.3 KiB
C++
269 lines
8.3 KiB
C++
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <simgear/nasal/nasal.h>
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#include <simgear/props/props.hxx>
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#include <Main/globals.hxx>
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#include "NasalSys.hxx"
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// Implementation of a Nasal wrapper for the SGPropertyNode class,
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// using the Nasal "ghost" (er... Garbage collection Handle for
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// OutSide Thingy) facility.
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//
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// Note that these functions appear in Nasal with prepended
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// underscores. They work on the low-level "ghost" objects and aren't
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// intended for use from user code, but from Nasal code you will find
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// in props.nas. That is where the Nasal props.Node class is defined,
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// which provides a saner interface along the lines of SGPropertyNode.
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static void propNodeGhostDestroy(void* ghost)
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{
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SGPropertyNode_ptr* prop = (SGPropertyNode_ptr*)ghost;
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delete prop;
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}
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naGhostType PropNodeGhostType = { propNodeGhostDestroy };
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static naRef propNodeGhostCreate(naContext c, SGPropertyNode* n)
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{
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if(!n) return naNil();
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SGPropertyNode_ptr* ghost = new SGPropertyNode_ptr(n);
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return naNewGhost(c, &PropNodeGhostType, ghost);
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}
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naRef FGNasalSys::propNodeGhost(SGPropertyNode* handle)
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{
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return propNodeGhostCreate(_context, handle);
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}
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#define NASTR(s) s ? naStr_fromdata(naNewString(c),(char*)(s),strlen(s)) : naNil()
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//
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// Standard header for the extension functions. It turns the "ghost"
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// found in arg[0] into a SGPropertyNode_ptr*, and then "unwraps" the
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// vector found in the second argument into a normal-looking args
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// array. This allows the Nasal handlers to do things like:
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// Node.getChild = func { _getChild(me.ghost, arg) }
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//
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#define NODEARG() \
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if(argc < 2 || !naIsGhost(args[0]) || \
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naGhost_type(args[0]) != &PropNodeGhostType) \
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naRuntimeError(c, "bad argument to props function"); \
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SGPropertyNode_ptr* node = (SGPropertyNode_ptr*)naGhost_ptr(args[0]); \
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naRef argv = args[1]
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static naRef f_getType(naContext c, naRef me, int argc, naRef* args)
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{
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NODEARG();
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char* t = "unknown";
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switch((*node)->getType()) {
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case SGPropertyNode::NONE: t = "NONE"; break;
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case SGPropertyNode::ALIAS: t = "ALIAS"; break;
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case SGPropertyNode::BOOL: t = "BOOL"; break;
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case SGPropertyNode::INT: t = "INT"; break;
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case SGPropertyNode::LONG: t = "LONG"; break;
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case SGPropertyNode::FLOAT: t = "FLOAT"; break;
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case SGPropertyNode::DOUBLE: t = "DOUBLE"; break;
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case SGPropertyNode::STRING: t = "STRING"; break;
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case SGPropertyNode::UNSPECIFIED: t = "UNSPECIFIED"; break;
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}
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return NASTR(t);
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}
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static naRef f_getName(naContext c, naRef me, int argc, naRef* args)
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{
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NODEARG();
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return NASTR((*node)->getName());
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}
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static naRef f_getIndex(naContext c, naRef me, int argc, naRef* args)
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{
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NODEARG();
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return naNum((*node)->getIndex());
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}
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static naRef f_getValue(naContext c, naRef me, int argc, naRef* args)
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{
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NODEARG();
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switch((*node)->getType()) {
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case SGPropertyNode::BOOL: case SGPropertyNode::INT:
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case SGPropertyNode::LONG: case SGPropertyNode::FLOAT:
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case SGPropertyNode::DOUBLE:
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return naNum((*node)->getDoubleValue());
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case SGPropertyNode::STRING:
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case SGPropertyNode::UNSPECIFIED:
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return NASTR((*node)->getStringValue());
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}
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return naNil();
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}
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static naRef f_setValue(naContext c, naRef me, int argc, naRef* args)
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{
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NODEARG();
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naRef val = naVec_get(argv, 0);
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if(naIsString(val)) (*node)->setStringValue(naStr_data(val));
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else (*node)->setDoubleValue(naNumValue(val).num);
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return naNil();
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}
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static naRef f_setIntValue(naContext c, naRef me, int argc, naRef* args)
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{
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NODEARG();
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// Original code:
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// int iv = (int)naNumValue(naVec_get(argv, 0)).num;
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// Junk to pacify the gcc-2.95.3 optimizer:
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naRef tmp0 = naVec_get(argv, 0);
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naRef tmp1 = naNumValue(tmp0);
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double tmp2 = tmp1.num;
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int iv = (int)tmp2;
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(*node)->setIntValue(iv);
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return naNil();
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}
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static naRef f_setBoolValue(naContext c, naRef me, int argc, naRef* args)
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{
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NODEARG();
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naRef val = naVec_get(argv, 0);
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(*node)->setBoolValue(naTrue(val) ? true : false);
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return naNil();
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}
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static naRef f_setDoubleValue(naContext c, naRef me, int argc, naRef* args)
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{
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NODEARG();
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(*node)->setDoubleValue(naNumValue(naVec_get(argv, 0)).num);
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return naNil();
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}
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static naRef f_getParent(naContext c, naRef me, int argc, naRef* args)
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{
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NODEARG();
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SGPropertyNode* n = (*node)->getParent();
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if(!n) return naNil();
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return propNodeGhostCreate(c, n);
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}
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static naRef f_getChild(naContext c, naRef me, int argc, naRef* args)
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{
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NODEARG();
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naRef child = naVec_get(argv, 0);
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if(!naIsString(child)) return naNil();
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naRef idx = naNumValue(naVec_get(argv, 1));
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bool create = naTrue(naVec_get(argv, 2));
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SGPropertyNode* n;
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if(naIsNil(idx) || !naIsNum(idx)) {
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n = (*node)->getChild(naStr_data(child), create);
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} else {
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n = (*node)->getChild(naStr_data(child), (int)idx.num, create);
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}
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if(!n) return naNil();
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return propNodeGhostCreate(c, n);
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}
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static naRef f_getChildren(naContext c, naRef me, int argc, naRef* args)
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{
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NODEARG();
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naRef result = naNewVector(c);
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if(naIsNil(argv) || naVec_size(argv) == 0) {
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// Get all children
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for(int i=0; i<(*node)->nChildren(); i++)
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naVec_append(result, propNodeGhostCreate(c, (*node)->getChild(i)));
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} else {
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// Get all children of a specified name
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naRef name = naVec_get(argv, 0);
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if(!naIsString(name)) return naNil();
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vector<SGPropertyNode_ptr> children
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= (*node)->getChildren(naStr_data(name));
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for(unsigned int i=0; i<children.size(); i++)
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naVec_append(result, propNodeGhostCreate(c, children[i]));
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}
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return result;
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}
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static naRef f_removeChild(naContext c, naRef me, int argc, naRef* args)
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{
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NODEARG();
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naRef child = naVec_get(argv, 0);
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naRef index = naVec_get(argv, 1);
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if(!naIsString(child) || !naIsNum(index)) return naNil();
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(*node)->removeChild(naStr_data(child), (int)index.num, false);
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return naNil();
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}
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static naRef f_removeChildren(naContext c, naRef me, int argc, naRef* args)
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{
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NODEARG();
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naRef result = naNewVector(c);
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if(naIsNil(argv) || naVec_size(argv) == 0) {
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// Remove all children
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for(int i = (*node)->nChildren() - 1; i >=0; i--)
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naVec_append(result, propNodeGhostCreate(c, (*node)->removeChild(i)));
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} else {
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// Remove all children of a specified name
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naRef name = naVec_get(argv, 0);
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if(!naIsString(name)) return naNil();
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vector<SGPropertyNode_ptr> children
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= (*node)->removeChildren(naStr_data(name), false);
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for(unsigned int i=0; i<children.size(); i++)
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naVec_append(result, propNodeGhostCreate(c, children[i]));
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}
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return result;
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}
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static naRef f_getNode(naContext c, naRef me, int argc, naRef* args)
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{
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NODEARG();
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naRef path = naVec_get(argv, 0);
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bool create = naTrue(naVec_get(argv, 1));
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if(!naIsString(path)) return naNil();
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SGPropertyNode* n = (*node)->getNode(naStr_data(path), create);
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return propNodeGhostCreate(c, n);
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}
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static naRef f_new(naContext c, naRef me, int argc, naRef* args)
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{
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return propNodeGhostCreate(c, new SGPropertyNode());
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}
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static naRef f_globals(naContext c, naRef me, int argc, naRef* args)
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{
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return propNodeGhostCreate(c, globals->get_props());
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}
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static struct {
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naCFunction func;
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char* name;
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} propfuncs[] = {
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{ f_getType, "_getType" },
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{ f_getName, "_getName" },
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{ f_getIndex, "_getIndex" },
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{ f_getValue, "_getValue" },
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{ f_setValue, "_setValue" },
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{ f_setIntValue, "_setIntValue" },
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{ f_setBoolValue, "_setBoolValue" },
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{ f_setDoubleValue, "_setDoubleValue" },
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{ f_getParent, "_getParent" },
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{ f_getChild, "_getChild" },
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{ f_getChildren, "_getChildren" },
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{ f_removeChild, "_removeChild" },
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{ f_removeChildren, "_removeChildren" },
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{ f_getNode, "_getNode" },
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{ f_new, "_new" },
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{ f_globals, "_globals" },
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{ 0, 0 }
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};
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naRef FGNasalSys::genPropsModule()
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{
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naRef namespc = naNewHash(_context);
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for(int i=0; propfuncs[i].name; i++)
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hashset(namespc, propfuncs[i].name,
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naNewFunc(_context, naNewCCode(_context, propfuncs[i].func)));
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return namespc;
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}
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