X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FMain%2Ffg_props.cxx;h=2c93ad36cb47de433224de253cadc54726b0239e;hb=09d4176e963be04dec40943083e369081b8f7a18;hp=0ba8109acbae88b71ffcf484839c2fff173183cf;hpb=0cc3bed841c8b75d6fe48705a3589a8bb500c609;p=flightgear.git

diff --git a/src/Main/fg_props.cxx b/src/Main/fg_props.cxx
index 0ba8109ac..2c93ad36c 100644
--- a/src/Main/fg_props.cxx
+++ b/src/Main/fg_props.cxx
@@ -24,9 +24,12 @@
 #  include <simgear/compiler.h>
 #endif
 
-#include <simgear/misc/exception.hxx>
+#include <simgear/structure/exception.hxx>
 #include <simgear/magvar/magvar.hxx>
 #include <simgear/timing/sg_time.hxx>
+#include <simgear/misc/sg_path.hxx>
+#include <simgear/scene/material/matlib.hxx>
+#include <simgear/sound/soundmgr_openal.hxx>
 
 #include STL_IOSTREAM
 
@@ -34,34 +37,22 @@
 #include <Aircraft/aircraft.hxx>
 #include <Time/tmp.hxx>
 #include <FDM/UIUCModel/uiuc_aircraftdir.h>
-#ifndef FG_NEW_ENVIRONMENT
-#  include <WeatherCM/FGLocalWeatherDatabase.h>
-#else
-#  include <Environment/environment.hxx>
-#endif // FG_NEW_ENVIRONMENT
-#include <Objects/matlib.hxx>
+#include <Environment/environment.hxx>
 
 #include <GUI/gui.h>
 
 #include "globals.hxx"
-#include "fgfs.hxx"
 #include "fg_props.hxx"
 
-#if !defined(SG_HAVE_NATIVE_SGI_COMPILERS)
 SG_USING_STD(istream);
 SG_USING_STD(ostream);
-#endif
-
-#if !defined(FG_NEW_ENVIRONMENT)
-static double getWindNorth ();
-static double getWindEast ();
-static double getWindDown ();
-#endif // FG_NEW_ENVIRONMENT
 
 static bool winding_ccw = true; // FIXME: temporary
 
 static bool fdm_data_logging = false; // FIXME: temporary
 
+static bool frozen = false;	// FIXME: temporary
+
 
 
 ////////////////////////////////////////////////////////////////////////
@@ -102,10 +93,10 @@ static const char *
 getLoggingClasses ()
 {
   sgDebugClass classes = logbuf::get_log_classes();
-  string result = "";
+  static string result = "";	// FIXME
   for (int i = 0; log_class_mappings[i].c != SG_UNDEFD; i++) {
     if ((classes&log_class_mappings[i].c) > 0) {
-      if (result != (string)"")
+      if (!result.empty())
 	result += '|';
       result += log_class_mappings[i].name;
     }
@@ -124,7 +115,7 @@ addLoggingClass (const string &name)
       return;
     }
   }
-  SG_LOG(SG_GENERAL, SG_ALERT, "Unknown logging class: " << name);
+  SG_LOG(SG_GENERAL, SG_WARN, "Unknown logging class: " << name);
 }
 
 
@@ -142,7 +133,7 @@ setLoggingClasses (const char * c)
     return;
   }
 
-  if (classes == "" || classes == "all") { // default
+  if (classes.empty() || classes == "all") { // default
     logbuf::set_log_classes(SG_ALL);
     SG_LOG(SG_GENERAL, SG_INFO, "Enabled all logging classes: "
 	   << getLoggingClasses());
@@ -195,12 +186,14 @@ getLoggingPriority ()
 static void
 setLoggingPriority (const char * p)
 {
+  if (p == 0)
+      return;
   string priority = p;
   if (priority == "bulk") {
     logbuf::set_log_priority(SG_BULK);
   } else if (priority == "debug") {
     logbuf::set_log_priority(SG_DEBUG);
-  } else if (priority == "" || priority == "info") { // default
+  } else if (priority.empty() || priority == "info") { // default
     logbuf::set_log_priority(SG_INFO);
   } else if (priority == "warn") {
     logbuf::set_log_priority(SG_WARN);
@@ -209,7 +202,37 @@ setLoggingPriority (const char * p)
   } else {
     SG_LOG(SG_GENERAL, SG_WARN, "Unknown logging priority " << priority);
   }
-  SG_LOG(SG_GENERAL, SG_INFO, "Logging priority is " << getLoggingPriority());
+  SG_LOG(SG_GENERAL, SG_DEBUG, "Logging priority is " << getLoggingPriority());
+}
+
+
+/**
+ * Return the current frozen state.
+ */
+static bool
+getFreeze ()
+{
+  return frozen;
+}
+
+
+/**
+ * Set the current frozen state.
+ */
+static void
+setFreeze (bool f)
+{
+    frozen = f;
+
+    // Stop sound on a pause
+    SGSoundMgr *s = globals->get_soundmgr();
+    if ( s != NULL ) {
+        if ( f ) {
+            s->pause();
+        } else {
+            s->resume();
+        }
+    }
 }
 
 
@@ -236,10 +259,10 @@ setAircraftDir (const char * dir)
 /**
  * Return the number of milliseconds elapsed since simulation started.
  */
-static long
-getElapsedTime_ms ()
+static double
+getElapsedTime_sec ()
 {
-  return globals->get_elapsed_time_ms();
+  return globals->get_sim_time_sec();
 }
 
 
@@ -249,14 +272,12 @@ getElapsedTime_ms ()
 static const char *
 getDateString ()
 {
-  string out;
-  char buf[64];
+  static char buf[64];		// FIXME
   struct tm * t = globals->get_time_params()->getGmt();
   sprintf(buf, "%.4d-%.2d-%.2dT%.2d:%.2d:%.2d",
 	  t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
 	  t->tm_hour, t->tm_min, t->tm_sec);
-  out = buf;
-  return out.c_str();
+  return buf;
 }
 
 
@@ -285,7 +306,7 @@ setDateString (const char * date_string)
 				// if the save file has been edited
 				// by hand.
   if (ret != 6) {
-    SG_LOG(SG_INPUT, SG_ALERT, "Date/time string " << date_string
+    SG_LOG(SG_INPUT, SG_WARN, "Date/time string " << date_string
 	   << " not in YYYY-MM-DDTHH:MM:SS format; skipped");
     return;
   }
@@ -304,7 +325,6 @@ setDateString (const char * date_string)
   double lat = current_aircraft.fdm_state->get_Latitude();
   globals->set_warp(warp);
   st->update(lon, lat, cur_time_override->getLongValue(), warp);
-  fgUpdateSkyAndLightingParams();
 }
 
 /**
@@ -313,40 +333,14 @@ setDateString (const char * date_string)
 static const char *
 getGMTString ()
 {
-  string out;
-  char buf[16];
+  static char buf[16];		// FIXME
   struct tm *t = globals->get_time_params()->getGmt();
   sprintf(buf, " %.2d:%.2d:%.2d",
 	  t->tm_hour, t->tm_min, t->tm_sec);
   // cout << t << " " << buf << endl;
-  out = buf;
-  return out.c_str();
-}
-
-
-/**
- * Get the texture rendering state.
- */
-static bool
-getTextures ()
-{
-  return (material_lib.get_step() == 0);
+  return buf;
 }
 
-
-/**
- * Set the texture rendering state.
- */
-static void
-setTextures (bool textures)
-{
-  if (textures)
-    material_lib.set_step(0);
-  else
-    material_lib.set_step(1);
-}
-
-
 /**
  * Return the magnetic variation
  */
@@ -373,98 +367,12 @@ getMagDip ()
 static double
 getHeadingMag ()
 {
-  return current_aircraft.fdm_state->get_Psi() * SGD_RADIANS_TO_DEGREES - getMagVar();
-}
-
-
-#if !defined(FG_NEW_ENVIRONMENT)
-
-/**
- * Get the current visibility (meters).
- */
-static double
-getVisibility ()
-{
-  return WeatherDatabase->getWeatherVisibility();
-}
-
-
-/**
- * Set the current visibility (meters).
- */
-static void
-setVisibility (double visibility)
-{
-  WeatherDatabase->setWeatherVisibility(visibility);
-}
-
-/**
- * Get the current wind north velocity (feet/second).
- */
-static double
-getWindNorth ()
-{
-  return current_aircraft.fdm_state->get_V_north_airmass();
-}
-
-
-/**
- * Set the current wind north velocity (feet/second).
- */
-static void
-setWindNorth (double speed)
-{
-  current_aircraft.fdm_state
-    ->set_Velocities_Local_Airmass(speed, getWindEast(), getWindDown());
-}
-
-
-/**
- * Get the current wind east velocity (feet/second).
- */
-static double
-getWindEast ()
-{
-  return current_aircraft.fdm_state->get_V_east_airmass();
-}
-
-
-/**
- * Set the current wind east velocity (feet/second).
- */
-static void
-setWindEast (double speed)
-{
-  cout << "Set wind-east to " << speed << endl;
-  current_aircraft.fdm_state->set_Velocities_Local_Airmass(getWindNorth(),
-							   speed,
-							   getWindDown());
-}
-
-
-/**
- * Get the current wind down velocity (feet/second).
- */
-static double
-getWindDown ()
-{
-  return current_aircraft.fdm_state->get_V_down_airmass();
-}
-
-
-/**
- * Set the current wind down velocity (feet/second).
- */
-static void
-setWindDown (double speed)
-{
-  current_aircraft.fdm_state->set_Velocities_Local_Airmass(getWindNorth(),
-							   getWindEast(),
-							   speed);
+  double magheading;
+  magheading = current_aircraft.fdm_state->get_Psi() * SGD_RADIANS_TO_DEGREES - getMagVar();
+  if (magheading < 0) magheading += 360;
+  return magheading;
 }
 
-#endif // FG_NEW_ENVIRONMENT
-
 static long
 getWarp ()
 {
@@ -547,36 +455,36 @@ setFDMDataLogging (bool state)
 // Tie the properties.
 ////////////////////////////////////////////////////////////////////////
 
+FGProperties::FGProperties ()
+{
+}
+
+FGProperties::~FGProperties ()
+{
+}
+
+void
+FGProperties::init ()
+{
+}
+
 void
-fgInitProps ()
+FGProperties::bind ()
 {
 				// Simulation
   fgTie("/sim/logging/priority", getLoggingPriority, setLoggingPriority);
   fgTie("/sim/logging/classes", getLoggingClasses, setLoggingClasses);
-  // fgTie("/sim/freeze", getFreeze, setFreeze);
+  fgTie("/sim/freeze/master", getFreeze, setFreeze);
   fgTie("/sim/aircraft-dir", getAircraftDir, setAircraftDir);
 
-  fgTie("/sim/time/elapsed-ms", getElapsedTime_ms);
+  fgTie("/sim/time/elapsed-sec", getElapsedTime_sec);
   fgTie("/sim/time/gmt", getDateString, setDateString);
   fgSetArchivable("/sim/time/gmt");
   fgTie("/sim/time/gmt-string", getGMTString);
-  fgTie("/sim/rendering/textures", getTextures, setTextures);
 
 				// Orientation
   fgTie("/orientation/heading-magnetic-deg", getHeadingMag);
 
-				// Environment
-#if !defined(FG_NEW_ENVIRONMENT)
-  fgTie("/environment/visibility-m", getVisibility, setVisibility);
-  fgSetArchivable("/environment/visibility-m");
-  fgTie("/environment/wind-from-north-fps", getWindNorth, setWindNorth);
-  fgSetArchivable("/environment/wind-from-north-fps");
-  fgTie("/environment/wind-from-east-fps", getWindEast, setWindEast);
-  fgSetArchivable("/environment/wind-from-east-fps");
-  fgTie("/environment/wind-from-down-fps", getWindDown, setWindDown);
-  fgSetArchivable("/environment/wind-from-down-fps");
-#endif
-
   fgTie("/environment/magnetic-variation-deg", getMagVar);
   fgTie("/environment/magnetic-dip-deg", getMagDip);
 
@@ -587,13 +495,54 @@ fgInitProps ()
   fgTie("/sim/temp/winding-ccw", getWindingCCW, setWindingCCW, false);
   fgTie("/sim/temp/full-screen", getFullScreen, setFullScreen);
   fgTie("/sim/temp/fdm-data-logging", getFDMDataLogging, setFDMDataLogging);
-	
 }
 
+void
+FGProperties::unbind ()
+{
+				// Simulation
+  fgUntie("/sim/logging/priority");
+  fgUntie("/sim/logging/classes");
+  fgUntie("/sim/freeze/master");
+  fgUntie("/sim/aircraft-dir");
+
+  fgUntie("/sim/time/elapsed-sec");
+  fgUntie("/sim/time/gmt");
+  fgUntie("/sim/time/gmt-string");
+
+				// Orientation
+  fgUntie("/orientation/heading-magnetic-deg");
+
+				// Environment
+  fgUntie("/environment/magnetic-variation-deg");
+  fgUntie("/environment/magnetic-dip-deg");
+
+  fgUntie("/sim/time/warp");
+  fgUntie("/sim/time/warp-delta");
+
+				// Misc. Temporary junk.
+  fgUntie("/sim/temp/winding-ccw");
+  fgUntie("/sim/temp/full-screen");
+  fgUntie("/sim/temp/fdm-data-logging");
+}
 
 void
-fgUpdateProps ()
+FGProperties::update (double dt)
 {
+                                // Date and time
+    struct tm * t = globals->get_time_params()->getGmt();
+
+    fgSetInt("/sim/time/utc/year", t->tm_year + 1900);
+    fgSetInt("/sim/time/utc/month", t->tm_mon + 1);
+    fgSetInt("/sim/time/utc/day", t->tm_mday);
+    fgSetInt("/sim/time/utc/hour", t->tm_hour);
+    fgSetInt("/sim/time/utc/minute", t->tm_min);
+    fgSetInt("/sim/time/utc/second", t->tm_sec);
+
+    fgSetDouble("/sim/time/utc/day-seconds",
+                t->tm_hour * 3600 +
+                t->tm_min * 60 +
+                t->tm_sec);
 }
 
 
@@ -610,12 +559,12 @@ bool
 fgSaveFlight (ostream &output, bool write_all)
 {
 
-  fgSetBool("/sim/startup/onground", false);
-  fgSetArchivable("/sim/startup/onground");
-  fgSetBool("/sim/startup/trim", false);
-  fgSetArchivable("/sim/startup/trim");
-  fgSetString("/sim/startup/speed-set", "UVW");
-  fgSetArchivable("/sim/startup/speed-set");
+  fgSetBool("/sim/presets/onground", false);
+  fgSetArchivable("/sim/presets/onground");
+  fgSetBool("/sim/presets/trim", false);
+  fgSetArchivable("/sim/presets/trim");
+  fgSetString("/sim/presets/speed-set", "UVW");
+  fgSetArchivable("/sim/presets/speed-set");
 
   try {
     writeProperties(output, globals->get_props(), write_all);
@@ -641,9 +590,9 @@ fgLoadFlight (istream &input)
     return false;
   }
 
-  fgSetBool("/sim/startup/onground", false);
-  fgSetBool("/sim/startup/trim", false);
-  fgSetString("/sim/startup/speed-set", "UVW");
+  fgSetBool("/sim/presets/onground", false);
+  fgSetBool("/sim/presets/trim", false);
+  fgSetString("/sim/presets/speed-set", "UVW");
 
   copyProperties(&props, globals->get_props());
   // When loading a flight, make it the
@@ -653,6 +602,28 @@ fgLoadFlight (istream &input)
 }
 
 
+bool
+fgLoadProps (const char * path, SGPropertyNode * props, bool in_fg_root)
+{
+    string fullpath;
+    if (in_fg_root) {
+        SGPath loadpath(globals->get_fg_root());
+        loadpath.append(path);
+        fullpath = loadpath.str();
+    } else {
+        fullpath = path;
+    }
+
+    try {
+        readProperties(fullpath, props);
+    } catch (const sg_exception &e) {
+        guiErrorMessage("Error reading properties: ", e);
+        return false;
+    }
+    return true;
+}
+
+
 
 ////////////////////////////////////////////////////////////////////////
 // Property convenience functions.
@@ -676,6 +647,19 @@ fgHasNode (const char * path)
   return (fgGetNode(path, false) != 0);
 }
 
+void
+fgAddChangeListener (SGPropertyChangeListener * listener, const char * path)
+{
+  fgGetNode(path, true)->addChangeListener(listener);
+}
+
+void
+fgAddChangeListener (SGPropertyChangeListener * listener,
+		     const char * path, int index)
+{
+  fgGetNode(path, index, true)->addChangeListener(listener);
+}
+
 bool
 fgGetBool (const char * name, bool defaultValue)
 {
@@ -753,7 +737,7 @@ fgSetArchivable (const char * name, bool state)
 {
   SGPropertyNode * node = globals->get_props()->getNode(name);
   if (node == 0)
-    SG_LOG(SG_GENERAL, SG_ALERT,
+    SG_LOG(SG_GENERAL, SG_DEBUG,
 	   "Attempt to set archive flag for non-existant property "
 	   << name);
   else
@@ -765,7 +749,7 @@ fgSetReadable (const char * name, bool state)
 {
   SGPropertyNode * node = globals->get_props()->getNode(name);
   if (node == 0)
-    SG_LOG(SG_GENERAL, SG_ALERT,
+    SG_LOG(SG_GENERAL, SG_DEBUG,
 	   "Attempt to set read flag for non-existant property "
 	   << name);
   else
@@ -777,7 +761,7 @@ fgSetWritable (const char * name, bool state)
 {
   SGPropertyNode * node = globals->get_props()->getNode(name);
   if (node == 0)
-    SG_LOG(SG_GENERAL, SG_ALERT,
+    SG_LOG(SG_GENERAL, SG_DEBUG,
 	   "Attempt to set write flag for non-existant property "
 	   << name);
   else
@@ -792,398 +776,4 @@ fgUntie (const char * name)
 }
 
 
-
-
-////////////////////////////////////////////////////////////////////////
-// Implementation of FGCondition.
-////////////////////////////////////////////////////////////////////////
-
-FGCondition::FGCondition ()
-{
-}
-
-FGCondition::~FGCondition ()
-{
-}
-
-
-
-////////////////////////////////////////////////////////////////////////
-// Implementation of FGPropertyCondition.
-////////////////////////////////////////////////////////////////////////
-
-FGPropertyCondition::FGPropertyCondition (const char * propname)
-  : _node(fgGetNode(propname, true))
-{
-}
-
-FGPropertyCondition::~FGPropertyCondition ()
-{
-}
-
-
-
-////////////////////////////////////////////////////////////////////////
-// Implementation of FGNotCondition.
-////////////////////////////////////////////////////////////////////////
-
-FGNotCondition::FGNotCondition (FGCondition * condition)
-  : _condition(condition)
-{
-}
-
-FGNotCondition::~FGNotCondition ()
-{
-  delete _condition;
-}
-
-bool
-FGNotCondition::test () const
-{
-  return !(_condition->test());
-}
-
-
-
-////////////////////////////////////////////////////////////////////////
-// 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);
-}
-
-
-
-////////////////////////////////////////////////////////////////////////
-// 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);
-}
-
-
-
-////////////////////////////////////////////////////////////////////////
-// 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);
-}
-
-
-
-////////////////////////////////////////////////////////////////////////
-// 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;
-}
-
-
-
-////////////////////////////////////////////////////////////////////////
-// 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());
-}
-
-
-
-// The top-level is always an implicit 'and' group
-FGCondition *
-fgReadCondition (const SGPropertyNode * node)
-{
-  return readAndConditions(node);
-}
-
-
 // end of fg_props.cxx