X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fprops%2Fcondition.cxx;h=1da575a4dbfe3c51623f59fc8633f5ed627ac373;hb=6672a1212cfccb2a08be21ff5271eae9b6f91b2a;hp=6f4d235fa8a77bbf826ca2764dbeaccf923d7a44;hpb=fcf72a712384e27c1cc758e987f1fab9afcced4d;p=simgear.git

diff --git a/simgear/props/condition.cxx b/simgear/props/condition.cxx
index 6f4d235f..1da575a4 100644
--- a/simgear/props/condition.cxx
+++ b/simgear/props/condition.cxx
@@ -8,7 +8,7 @@
 // $Id$
 
 #ifdef HAVE_CONFIG_H
-#  include <simgear/compiler.h>
+#  include <simgear_config.h>
 #endif
 
 // #include <iostream>
@@ -18,12 +18,144 @@
 #include "props.hxx"
 #include "condition.hxx"
 
+#include <simgear/structure/SGExpression.hxx>
+
 using std::istream;
 using std::ostream;
+using std::string;
+
+/**
+ * Condition for a single property.
+ *
+ * This condition is true only if the property returns a boolean
+ * true value.
+ */
+class SGPropertyCondition : public SGCondition
+{
+public:
+  SGPropertyCondition ( SGPropertyNode *prop_root,
+                        const char * propname  );
+  virtual ~SGPropertyCondition ();
+  virtual bool test () const { return _node->getBoolValue(); }
+  virtual void collectDependentProperties(std::set<const SGPropertyNode*>& props) const
+    { props.insert(_node.get()); }
+private:
+  SGConstPropertyNode_ptr _node;
+};
+
+/**
+ * Condition with constant value
+ *
+ */
+class SGConstantCondition : public SGCondition
+{
+public:
+  SGConstantCondition (bool v) : _value(v) { ; }
+  virtual bool test () const { return _value; }
+private:
+  bool _value;
+};
+
+/**
+ * Condition for a 'not' operator.
+ *
+ * This condition is true only if the child condition is false.
+ */
+class SGNotCondition : public SGCondition
+{
+public:
+  SGNotCondition (SGCondition * condition);
+  virtual ~SGNotCondition ();
+  virtual bool test () const;
+  virtual void collectDependentProperties(std::set<const SGPropertyNode*>& props) const;
+private:
+  SGConditionRef _condition;
+};
+
+
+/**
+ * Condition for an 'and' group.
+ *
+ * This condition is true only if all of the conditions
+ * in the group are true.
+ */
+class SGAndCondition : public SGCondition
+{
+public:
+  SGAndCondition ();
+  virtual ~SGAndCondition ();
+  virtual bool test () const;
+				// transfer pointer ownership
+  virtual void addCondition (SGCondition * condition);
+  virtual void collectDependentProperties(std::set<const SGPropertyNode*>& props) const;
+private:
+  std::vector<SGConditionRef> _conditions;
+};
+
+
+/**
+ * Condition for an 'or' group.
+ *
+ * This condition is true if at least one of the conditions in the
+ * group is true.
+ */
+class SGOrCondition : public SGCondition
+{
+public:
+  SGOrCondition ();
+  virtual ~SGOrCondition ();
+  virtual bool test () const;
+				// transfer pointer ownership
+  virtual void addCondition (SGCondition * condition);
+  virtual void collectDependentProperties(std::set<const SGPropertyNode*>& props) const;
+private:
+  std::vector<SGConditionRef> _conditions;
+};
+
+
+/**
+ * Abstract base class for property comparison conditions.
+ */
+class SGComparisonCondition : public SGCondition
+{
+public:
+  enum Type {
+    LESS_THAN,
+    GREATER_THAN,
+    EQUALS
+  };
+  SGComparisonCondition (Type type, bool reverse = false);
+  virtual ~SGComparisonCondition ();
+  virtual bool test () const;
+  virtual void setLeftProperty( SGPropertyNode *prop_root,
+                                const char * propname );
+  virtual void setRightProperty( SGPropertyNode *prop_root,
+                                 const char * propname );
+  virtual void setPrecisionProperty( SGPropertyNode *prop_root,
+                                 const char * propname );
+  // will make a local copy
+  virtual void setLeftValue (const SGPropertyNode * value);
+  virtual void setRightValue (const SGPropertyNode * value);
+  virtual void setPrecisionValue (const SGPropertyNode * value);
+  
+  void setLeftDExpression(SGExpressiond* dexp);
+  void setRightDExpression(SGExpressiond* dexp);
+  void setPrecisionDExpression(SGExpressiond* dexp);
+  
+  virtual void collectDependentProperties(std::set<const SGPropertyNode*>& props) const;
+private:
+  Type _type;
+  bool _reverse;
+  SGPropertyNode_ptr _left_property;
+  SGPropertyNode_ptr _right_property;
+  SGPropertyNode_ptr _precision_property;
+  
+  SGSharedPtr<SGExpressiond> _left_dexp;
+  SGSharedPtr<SGExpressiond> _right_dexp;
+  SGSharedPtr<SGExpressiond> _precision_dexp;
+};
 
 
-
-
 ////////////////////////////////////////////////////////////////////////
 // Implementation of SGCondition.
 ////////////////////////////////////////////////////////////////////////
@@ -37,7 +169,6 @@ SGCondition::~SGCondition ()
 }
 
 
-
 ////////////////////////////////////////////////////////////////////////
 // Implementation of SGPropertyCondition.
 ////////////////////////////////////////////////////////////////////////
@@ -53,7 +184,6 @@ SGPropertyCondition::~SGPropertyCondition ()
 }
 
 
-
 ////////////////////////////////////////////////////////////////////////
 // Implementation of SGNotCondition.
 ////////////////////////////////////////////////////////////////////////
@@ -73,8 +203,12 @@ SGNotCondition::test () const
   return !(_condition->test());
 }
 
+void
+SGNotCondition::collectDependentProperties(std::set<const SGPropertyNode*>& props) const
+{
+    _condition->collectDependentProperties(props);
+}
 
-
 ////////////////////////////////////////////////////////////////////////
 // Implementation of SGAndCondition.
 ////////////////////////////////////////////////////////////////////////
@@ -90,8 +224,8 @@ SGAndCondition::~SGAndCondition ()
 bool
 SGAndCondition::test () const
 {
-  int nConditions = _conditions.size();
-  for (int i = 0; i < nConditions; i++) {
+  for( size_t i = 0; i < _conditions.size(); i++ )
+  {
     if (!_conditions[i]->test())
       return false;
   }
@@ -104,8 +238,14 @@ SGAndCondition::addCondition (SGCondition * condition)
   _conditions.push_back(condition);
 }
 
+void
+SGAndCondition::collectDependentProperties(std::set<const SGPropertyNode*>& props) const
+{
+  for( size_t i = 0; i < _conditions.size(); i++ )
+    _conditions[i]->collectDependentProperties(props);
+}
+
 
-
 ////////////////////////////////////////////////////////////////////////
 // Implementation of SGOrCondition.
 ////////////////////////////////////////////////////////////////////////
@@ -121,8 +261,8 @@ SGOrCondition::~SGOrCondition ()
 bool
 SGOrCondition::test () const
 {
-  int nConditions = _conditions.size();
-  for (int i = 0; i < nConditions; i++) {
+  for( size_t i = 0; i < _conditions.size(); i++ )
+  {
     if (_conditions[i]->test())
       return true;
   }
@@ -135,14 +275,32 @@ SGOrCondition::addCondition (SGCondition * condition)
   _conditions.push_back(condition);
 }
 
+void
+SGOrCondition::collectDependentProperties(std::set<const SGPropertyNode*>& props) const
+{
+  for( size_t i = 0; i < _conditions.size(); i++ )
+    _conditions[i]->collectDependentProperties(props);
+}
+
 
-
 ////////////////////////////////////////////////////////////////////////
 // Implementation of SGComparisonCondition.
 ////////////////////////////////////////////////////////////////////////
 
+template<typename T> 
+static int doComp( T v1, T v2, T e )
+{
+  T d = v1 - v2;
+  if( d < -e )
+    return SGComparisonCondition::LESS_THAN;
+  else if( d > e )
+    return SGComparisonCondition::GREATER_THAN;
+  else
+    return SGComparisonCondition::EQUALS;
+}
+
 static int
-doComparison (const SGPropertyNode * left, const SGPropertyNode *right)
+doComparison (const SGPropertyNode * left, const SGPropertyNode * right, const SGPropertyNode * precision )
 {
   using namespace simgear;
   switch (left->getType()) {
@@ -157,55 +315,28 @@ doComparison (const SGPropertyNode * left, const SGPropertyNode *right)
       return SGComparisonCondition::EQUALS;
     break;
   }
-  case props::INT: {
-    int v1 = left->getIntValue();
-    int v2 = right->getIntValue();
-    if (v1 < v2)
-      return SGComparisonCondition::LESS_THAN;
-    else if (v1 > v2)
-      return SGComparisonCondition::GREATER_THAN;
-    else
-      return SGComparisonCondition::EQUALS;
-    break;
-  }
-  case props::LONG: {
-    long v1 = left->getLongValue();
-    long v2 = right->getLongValue();
-    if (v1 < v2)
-      return SGComparisonCondition::LESS_THAN;
-    else if (v1 > v2)
-      return SGComparisonCondition::GREATER_THAN;
-    else
-      return SGComparisonCondition::EQUALS;
-    break;
-  }
-  case props::FLOAT: {
-    float v1 = left->getFloatValue();
-    float v2 = right->getFloatValue();
-    if (v1 < v2)
-      return SGComparisonCondition::LESS_THAN;
-    else if (v1 > v2)
-      return SGComparisonCondition::GREATER_THAN;
-    else
-      return SGComparisonCondition::EQUALS;
-    break;
-  }
-  case props::DOUBLE: {
-    double v1 = left->getDoubleValue();
-    double v2 = right->getDoubleValue();
-    if (v1 < v2)
-      return SGComparisonCondition::LESS_THAN;
-    else if (v1 > v2)
-      return SGComparisonCondition::GREATER_THAN;
-    else
-      return SGComparisonCondition::EQUALS;
-    break;
-  }
+  case props::INT:
+    return doComp<int>(left->getIntValue(), right->getIntValue(), 
+           precision ? std::abs(precision->getIntValue()/2) : 0 );
+
+  case props::LONG:
+    return doComp<long>(left->getLongValue(), right->getLongValue(), 
+           precision ? std::abs(precision->getLongValue()/2L) : 0L );
+
+  case props::FLOAT:
+    return doComp<float>(left->getFloatValue(), right->getFloatValue(), 
+           precision ? std::fabs(precision->getFloatValue()/2.0f) : 0.0f );
+
+  case props::DOUBLE:
+    return doComp<double>(left->getDoubleValue(), right->getDoubleValue(), 
+           precision ? std::fabs(precision->getDoubleValue()/2.0) : 0.0 );
+
   case props::STRING:
   case props::NONE:
   case props::UNSPECIFIED: {
-    string v1 = left->getStringValue();
-    string v2 = right->getStringValue();
+    size_t l = precision ? precision->getLongValue() : string::npos;
+    string v1 = string(left->getStringValue()).substr(0,l);
+    string v2 = string(right->getStringValue()).substr(0,l);
     if (v1 < v2)
       return SGComparisonCondition::LESS_THAN;
     else if (v1 > v2)
@@ -224,10 +355,7 @@ doComparison (const SGPropertyNode * left, const SGPropertyNode *right)
 
 SGComparisonCondition::SGComparisonCondition (Type type, bool reverse)
   : _type(type),
-    _reverse(reverse),
-    _left_property(0),
-    _right_property(0),
-    _right_value(0)
+    _reverse(reverse)
 {
 }
 
@@ -239,14 +367,23 @@ bool
 SGComparisonCondition::test () const
 {
 				// Always fail if incompletely specified
-  if (_left_property == 0 ||
-      (_right_property == 0 && _right_value == 0))
+  if (!_left_property || !_right_property)
     return false;
 
-				// Get LESS_THAN, EQUALS, or GREATER_THAN
-  int cmp =
-    doComparison(_left_property,
-		 (_right_property != 0 ? _right_property : _right_value));
+  // Get LESS_THAN, EQUALS, or GREATER_THAN
+  if (_left_dexp) {
+    _left_property->setDoubleValue(_left_dexp->getValue(NULL));
+  }
+  
+  if (_right_dexp) {
+    _right_property->setDoubleValue(_right_dexp->getValue(NULL));
+  }
+
+  if (_precision_dexp) {
+    _precision_property->setDoubleValue(_precision_dexp->getValue(NULL));
+  }
+        
+  int cmp = doComparison(_left_property, _right_property, _precision_property );
   if (!_reverse)
     return (cmp == _type);
   else
@@ -264,19 +401,75 @@ void
 SGComparisonCondition::setRightProperty( SGPropertyNode *prop_root,
                                          const char * propname )
 {
-  _right_value = 0;
   _right_property = prop_root->getNode(propname, true);
 }
 
+void
+SGComparisonCondition::setPrecisionProperty( SGPropertyNode *prop_root,
+                                         const char * propname )
+{
+  _precision_property = prop_root->getNode(propname, true);
+}
+
+void
+SGComparisonCondition::setLeftValue (const SGPropertyNode *node)
+{
+  _left_property = new SGPropertyNode(*node);
+}
+
+void
+SGComparisonCondition::setPrecisionValue (const SGPropertyNode *node)
+{
+  _precision_property = new SGPropertyNode(*node);
+}
+
 void
 SGComparisonCondition::setRightValue (const SGPropertyNode *node)
 {
-  _right_property = 0;
-  _right_value = new SGPropertyNode(*node);
+  _right_property = new SGPropertyNode(*node);
 }
 
+void
+SGComparisonCondition::setLeftDExpression(SGExpressiond* dexp)
+{
+  _left_property = new SGPropertyNode();
+  _left_dexp = dexp;
+}
+
+void
+SGComparisonCondition::setRightDExpression(SGExpressiond* dexp)
+{
+  _right_property = new SGPropertyNode();
+  _right_dexp = dexp;
+}
+
+void
+SGComparisonCondition::setPrecisionDExpression(SGExpressiond* dexp)
+{
+  _precision_property = new SGPropertyNode();
+  _precision_dexp = dexp;
+}
+
+void
+SGComparisonCondition::collectDependentProperties(std::set<const SGPropertyNode*>& props) const
+{
+  if (_left_dexp)
+    _left_dexp->collectDependentProperties(props);
+  else
+    props.insert(_left_property);
+  
+  if (_right_dexp)
+    _right_dexp->collectDependentProperties(props);
+  else
+    props.insert(_right_property);
+  
+  if (_precision_dexp)
+    _precision_dexp->collectDependentProperties(props);
+  else if (_precision_property)
+    props.insert(_precision_property);
+  
+}
 
-
 ////////////////////////////////////////////////////////////////////////
 // Read a condition and use it if necessary.
 ////////////////////////////////////////////////////////////////////////
@@ -341,14 +534,56 @@ readComparison( SGPropertyNode *prop_root,
 		bool reverse)
 {
   SGComparisonCondition * condition = new SGComparisonCondition(type, reverse);
-  condition->setLeftProperty(prop_root, node->getStringValue("property[0]"));
-  if (node->hasValue("property[1]"))
-    condition->setRightProperty(prop_root, node->getStringValue("property[1]"));
-  else if (node->hasValue("value"))
-    condition->setRightValue(node->getChild("value", 0));
-  else
-    throw sg_exception("condition: comparison without property[1] or value");
-
+  if (node->nChildren() < 2 || node->nChildren() > 3 ) {
+    throw sg_exception("condition: comparison without two or three children");
+  }
+  
+  const SGPropertyNode* left = node->getChild(0), 
+    *right = node->getChild(1);
+
+  {
+    string leftName(left->getName());
+    if (leftName == "property") {
+      condition->setLeftProperty(prop_root, left->getStringValue());
+    } else if (leftName == "value") {
+      condition->setLeftValue(left);
+    } else if (leftName == "expression") {
+      SGExpressiond* exp = SGReadDoubleExpression(prop_root, left->getChild(0));
+      condition->setLeftDExpression(exp);
+    } else {
+      throw sg_exception("Unknown condition comparison left child:" + leftName);
+    }
+  }
+    
+  {
+    string rightName(right->getName());
+    if (rightName == "property") {
+      condition->setRightProperty(prop_root, right->getStringValue());
+    } else if (rightName == "value") {
+      condition->setRightValue(right);
+    } else if (rightName == "expression") {
+      SGExpressiond* exp = SGReadDoubleExpression(prop_root, right->getChild(0));
+      condition->setRightDExpression(exp);
+    } else {
+      throw sg_exception("Unknown condition comparison right child:" + rightName);
+    }
+  }
+  
+  if( node->nChildren() == 3 ) {
+    const SGPropertyNode *n = node->getChild(2);
+    string name(n->getName());
+    if (name == "precision-property") {
+      condition->setPrecisionProperty(prop_root, n->getStringValue());
+    } else if (name == "precision-value") {
+      condition->setPrecisionValue(n);
+    } else if (name == "precision-expression") {
+      SGExpressiond* exp = SGReadDoubleExpression(prop_root, n->getChild(0));
+      condition->setPrecisionDExpression(exp);
+    } else {
+      throw sg_exception("Unknown condition comparison precision child:" + name );
+    }
+  }
+  
   return condition;
 }
 
@@ -381,12 +616,15 @@ readCondition( SGPropertyNode *prop_root, const SGPropertyNode *node )
                           false);
   else if (name == "not-equals")
     return readComparison(prop_root, node, SGComparisonCondition::EQUALS, true);
+  else if (name == "false") 
+    return new SGConstantCondition(false);
+  else if (name == "true")
+    return new SGConstantCondition(true);
   else
     return 0;
 }
 
 
-
 ////////////////////////////////////////////////////////////////////////
 // Implementation of SGConditional.
 ////////////////////////////////////////////////////////////////////////
@@ -413,7 +651,6 @@ SGConditional::test () const
 }
 
 
-
 // The top-level is always an implicit 'and' group
 SGCondition *
 sgReadCondition( SGPropertyNode *prop_root, const SGPropertyNode *node )