-
-\f
-////////////////////////////////////////////////////////////////////////
-// Implementation of FGCondition.
-////////////////////////////////////////////////////////////////////////
-
-FGCondition::FGCondition ()
-{
-}
-
-FGCondition::~FGCondition ()
-{
-}
-
-
-\f
-////////////////////////////////////////////////////////////////////////
-// Implementation of FGPropertyCondition.
-////////////////////////////////////////////////////////////////////////
-
-FGPropertyCondition::FGPropertyCondition (const char * propname)
- : _node(fgGetNode(propname, true))
-{
-}
-
-FGPropertyCondition::~FGPropertyCondition ()
-{
-}
-
-
-\f
-////////////////////////////////////////////////////////////////////////
-// Implementation of FGNotCondition.
-////////////////////////////////////////////////////////////////////////
-
-FGNotCondition::FGNotCondition (FGCondition * condition)
- : _condition(condition)
-{
-}
-
-FGNotCondition::~FGNotCondition ()
-{
- delete _condition;
-}
-
-bool
-FGNotCondition::test () const
-{
- return !(_condition->test());
-}
-
-
-\f
-////////////////////////////////////////////////////////////////////////
-// Implementation of FGAndCondition.
-////////////////////////////////////////////////////////////////////////
-
-FGAndCondition::FGAndCondition ()
-{
-}
-
-FGAndCondition::~FGAndCondition ()
-{
- for (unsigned int i = 0; i < _conditions.size(); i++)
- delete _conditions[i];
-}
-
-bool
-FGAndCondition::test () const
-{
- int nConditions = _conditions.size();
- for (int i = 0; i < nConditions; i++) {
- if (!_conditions[i]->test())
- return false;
- }
- return true;
-}
-
-void
-FGAndCondition::addCondition (FGCondition * condition)
-{
- _conditions.push_back(condition);
-}
-
-
-\f
-////////////////////////////////////////////////////////////////////////
-// Implementation of FGOrCondition.
-////////////////////////////////////////////////////////////////////////
-
-FGOrCondition::FGOrCondition ()
-{
-}
-
-FGOrCondition::~FGOrCondition ()
-{
- for (unsigned int i = 0; i < _conditions.size(); i++)
- delete _conditions[i];
-}
-
-bool
-FGOrCondition::test () const
-{
- int nConditions = _conditions.size();
- for (int i = 0; i < nConditions; i++) {
- if (_conditions[i]->test())
- return true;
- }
- return false;
-}
-
-void
-FGOrCondition::addCondition (FGCondition * condition)
-{
- _conditions.push_back(condition);
-}
-
-
-\f
-////////////////////////////////////////////////////////////////////////
-// Implementation of FGComparisonCondition.
-////////////////////////////////////////////////////////////////////////
-
-static int
-doComparison (const SGPropertyNode * left, const SGPropertyNode *right)
-{
- switch (left->getType()) {
- case SGPropertyNode::BOOL: {
- bool v1 = left->getBoolValue();
- bool v2 = right->getBoolValue();
- if (v1 < v2)
- return FGComparisonCondition::LESS_THAN;
- else if (v1 > v2)
- return FGComparisonCondition::GREATER_THAN;
- else
- return FGComparisonCondition::EQUALS;
- break;
- }
- case SGPropertyNode::INT: {
- int v1 = left->getIntValue();
- int v2 = right->getIntValue();
- if (v1 < v2)
- return FGComparisonCondition::LESS_THAN;
- else if (v1 > v2)
- return FGComparisonCondition::GREATER_THAN;
- else
- return FGComparisonCondition::EQUALS;
- break;
- }
- case SGPropertyNode::LONG: {
- long v1 = left->getLongValue();
- long v2 = right->getLongValue();
- if (v1 < v2)
- return FGComparisonCondition::LESS_THAN;
- else if (v1 > v2)
- return FGComparisonCondition::GREATER_THAN;
- else
- return FGComparisonCondition::EQUALS;
- break;
- }
- case SGPropertyNode::FLOAT: {
- float v1 = left->getFloatValue();
- float v2 = right->getFloatValue();
- if (v1 < v2)
- return FGComparisonCondition::LESS_THAN;
- else if (v1 > v2)
- return FGComparisonCondition::GREATER_THAN;
- else
- return FGComparisonCondition::EQUALS;
- break;
- }
- case SGPropertyNode::DOUBLE: {
- double v1 = left->getDoubleValue();
- double v2 = right->getDoubleValue();
- if (v1 < v2)
- return FGComparisonCondition::LESS_THAN;
- else if (v1 > v2)
- return FGComparisonCondition::GREATER_THAN;
- else
- return FGComparisonCondition::EQUALS;
- break;
- }
- case SGPropertyNode::STRING:
- case SGPropertyNode::NONE:
- case SGPropertyNode::UNSPECIFIED: {
- string v1 = left->getStringValue();
- string v2 = right->getStringValue();
- if (v1 < v2)
- return FGComparisonCondition::LESS_THAN;
- else if (v1 > v2)
- return FGComparisonCondition::GREATER_THAN;
- else
- return FGComparisonCondition::EQUALS;
- break;
- }
- }
- throw sg_exception("Unrecognized node type");
- return 0;
-}
-
-
-FGComparisonCondition::FGComparisonCondition (Type type, bool reverse)
- : _type(type),
- _reverse(reverse),
- _left_property(0),
- _right_property(0),
- _right_value(0)
-{
-}
-
-FGComparisonCondition::~FGComparisonCondition ()
-{
- delete _right_value;
-}
-
-bool
-FGComparisonCondition::test () const
-{
- // Always fail if incompletely specified
- if (_left_property == 0 ||
- (_right_property == 0 && _right_value == 0))
- return false;
-
- // Get LESS_THAN, EQUALS, or GREATER_THAN
- int cmp =
- doComparison(_left_property,
- (_right_property != 0 ? _right_property : _right_value));
- if (!_reverse)
- return (cmp == _type);
- else
- return (cmp != _type);
-}
-
-void
-FGComparisonCondition::setLeftProperty (const char * propname)
-{
- _left_property = fgGetNode(propname, true);
-}
-
-void
-FGComparisonCondition::setRightProperty (const char * propname)
-{
- delete _right_value;
- _right_value = 0;
- _right_property = fgGetNode(propname, true);
-}
-
-void
-FGComparisonCondition::setRightValue (const SGPropertyNode *node)
-{
- _right_property = 0;
- delete _right_value;
- _right_value = new SGPropertyNode(*node);
-}
-
-
-\f
-////////////////////////////////////////////////////////////////////////
-// Read a condition and use it if necessary.
-////////////////////////////////////////////////////////////////////////
-
- // Forward declaration
-static FGCondition * readCondition (const SGPropertyNode * node);
-
-static FGCondition *
-readPropertyCondition (const SGPropertyNode * node)
-{
- return new FGPropertyCondition(node->getStringValue());
-}
-
-static FGCondition *
-readNotCondition (const SGPropertyNode * node)
-{
- int nChildren = node->nChildren();
- for (int i = 0; i < nChildren; i++) {
- const SGPropertyNode * child = node->getChild(i);
- FGCondition * condition = readCondition(child);
- if (condition != 0)
- return new FGNotCondition(condition);
- }
- SG_LOG(SG_COCKPIT, SG_ALERT, "Panel: empty 'not' condition");
- return 0;
-}
-
-static FGCondition *
-readAndConditions (const SGPropertyNode * node)
-{
- FGAndCondition * andCondition = new FGAndCondition;
- int nChildren = node->nChildren();
- for (int i = 0; i < nChildren; i++) {
- const SGPropertyNode * child = node->getChild(i);
- FGCondition * condition = readCondition(child);
- if (condition != 0)
- andCondition->addCondition(condition);
- }
- return andCondition;
-}
-
-static FGCondition *
-readOrConditions (const SGPropertyNode * node)
-{
- FGOrCondition * orCondition = new FGOrCondition;
- int nChildren = node->nChildren();
- for (int i = 0; i < nChildren; i++) {
- const SGPropertyNode * child = node->getChild(i);
- FGCondition * condition = readCondition(child);
- if (condition != 0)
- orCondition->addCondition(condition);
- }
- return orCondition;
-}
-
-static FGCondition *
-readComparison (const SGPropertyNode * node,
- FGComparisonCondition::Type type,
- bool reverse)
-{
- FGComparisonCondition * condition = new FGComparisonCondition(type, reverse);
- condition->setLeftProperty(node->getStringValue("property[0]"));
- if (node->hasValue("property[1]"))
- condition->setRightProperty(node->getStringValue("property[1]"));
- else
- condition->setRightValue(node->getChild("value", 0));
-
- return condition;
-}
-
-static FGCondition *
-readCondition (const SGPropertyNode * node)
-{
- const string &name = node->getName();
- if (name == "property")
- return readPropertyCondition(node);
- else if (name == "not")
- return readNotCondition(node);
- else if (name == "and")
- return readAndConditions(node);
- else if (name == "or")
- return readOrConditions(node);
- else if (name == "less-than")
- return readComparison(node, FGComparisonCondition::LESS_THAN, false);
- else if (name == "less-than-equals")
- return readComparison(node, FGComparisonCondition::GREATER_THAN, true);
- else if (name == "greater-than")
- return readComparison(node, FGComparisonCondition::GREATER_THAN, false);
- else if (name == "greater-than-equals")
- return readComparison(node, FGComparisonCondition::LESS_THAN, true);
- else if (name == "equals")
- return readComparison(node, FGComparisonCondition::EQUALS, false);
- else if (name == "not-equals")
- return readComparison(node, FGComparisonCondition::EQUALS, true);
- else
- return 0;
-}
-
-
-\f
-////////////////////////////////////////////////////////////////////////
-// Implementation of FGConditional.
-////////////////////////////////////////////////////////////////////////
-
-FGConditional::FGConditional ()
- : _condition (0)
-{
-}
-
-FGConditional::~FGConditional ()
-{
- delete _condition;
-}
-
-void
-FGConditional::setCondition (FGCondition * condition)
-{
- delete _condition;
- _condition = condition;
-}
-
-bool
-FGConditional::test () const
-{
- return ((_condition == 0) || _condition->test());
-}
-
-
-\f
-// The top-level is always an implicit 'and' group
-FGCondition *
-fgReadCondition (const SGPropertyNode * node)
-{
- return readAndConditions(node);
-}
-
-