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flightgear/src/Main/fg_props.cxx

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// fg_props.cxx -- support for FlightGear properties.
//
// Written by David Megginson, started 2000.
//
// Copyright (C) 2000, 2001 David Megginson - david@megginson.com
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// $Id$
#ifdef HAVE_CONFIG_H
# include <simgear/compiler.h>
#endif
#include <simgear/misc/exception.hxx>
#include <simgear/magvar/magvar.hxx>
#include <simgear/timing/sg_time.hxx>
#include <simgear/misc/sg_path.hxx>
#include STL_IOSTREAM
#include <ATC/ATCdisplay.hxx>
#include <Aircraft/aircraft.hxx>
#include <Time/tmp.hxx>
#include <FDM/UIUCModel/uiuc_aircraftdir.h>
#ifdef FG_WEATHERCM
# include <WeatherCM/FGLocalWeatherDatabase.h>
#else
# include <Environment/environment.hxx>
#endif // FG_WEATHERCM
#include <Objects/matlib.hxx>
#include <GUI/gui.h>
#include <Sound/soundmgr.hxx>
#include "globals.hxx"
#include "fgfs.hxx"
#include "fg_props.hxx"
SG_USING_STD(istream);
SG_USING_STD(ostream);
#ifdef FG_WEATHERCM
static double getWindNorth ();
static double getWindEast ();
static double getWindDown ();
#endif // FG_WEATHERCM
static bool winding_ccw = true; // FIXME: temporary
static bool fdm_data_logging = false; // FIXME: temporary
static bool frozen = false; // FIXME: temporary
////////////////////////////////////////////////////////////////////////
// Default property bindings (not yet handled by any module).
////////////////////////////////////////////////////////////////////////
struct LogClassMapping {
sgDebugClass c;
string name;
LogClassMapping(sgDebugClass cc, string nname) { c = cc; name = nname; }
};
LogClassMapping log_class_mappings [] = {
LogClassMapping(SG_NONE, "none"),
LogClassMapping(SG_TERRAIN, "terrain"),
LogClassMapping(SG_ASTRO, "astro"),
LogClassMapping(SG_FLIGHT, "flight"),
LogClassMapping(SG_INPUT, "input"),
LogClassMapping(SG_GL, "gl"),
LogClassMapping(SG_VIEW, "view"),
LogClassMapping(SG_COCKPIT, "cockpit"),
LogClassMapping(SG_GENERAL, "general"),
LogClassMapping(SG_MATH, "math"),
LogClassMapping(SG_EVENT, "event"),
LogClassMapping(SG_AIRCRAFT, "aircraft"),
LogClassMapping(SG_AUTOPILOT, "autopilot"),
LogClassMapping(SG_IO, "io"),
LogClassMapping(SG_CLIPPER, "clipper"),
LogClassMapping(SG_NETWORK, "network"),
LogClassMapping(SG_UNDEFD, "")
};
/**
* Get the logging classes.
*/
static const char *
getLoggingClasses ()
{
sgDebugClass classes = logbuf::get_log_classes();
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.empty())
result += '|';
result += log_class_mappings[i].name;
}
}
return result.c_str();
}
static void
addLoggingClass (const string &name)
{
sgDebugClass classes = logbuf::get_log_classes();
for (int i = 0; log_class_mappings[i].c != SG_UNDEFD; i++) {
if (name == log_class_mappings[i].name) {
logbuf::set_log_classes(sgDebugClass(classes|log_class_mappings[i].c));
return;
}
}
SG_LOG(SG_GENERAL, SG_ALERT, "Unknown logging class: " << name);
}
/**
* Set the logging classes.
*/
static void
setLoggingClasses (const char * c)
{
string classes = c;
logbuf::set_log_classes(SG_NONE);
if (classes == "none") {
SG_LOG(SG_GENERAL, SG_INFO, "Disabled all logging classes");
return;
}
if (classes.empty() || classes == "all") { // default
logbuf::set_log_classes(SG_ALL);
SG_LOG(SG_GENERAL, SG_INFO, "Enabled all logging classes: "
<< getLoggingClasses());
return;
}
string rest = classes;
string name = "";
int sep = rest.find('|');
while (sep > 0) {
name = rest.substr(0, sep);
rest = rest.substr(sep+1);
addLoggingClass(name);
sep = rest.find('|');
}
addLoggingClass(rest);
SG_LOG(SG_GENERAL, SG_INFO, "Set logging classes to "
<< getLoggingClasses());
}
/**
* Get the logging priority.
*/
static const char *
getLoggingPriority ()
{
switch (logbuf::get_log_priority()) {
case SG_BULK:
return "bulk";
case SG_DEBUG:
return "debug";
case SG_INFO:
return "info";
case SG_WARN:
return "warn";
case SG_ALERT:
return "alert";
default:
SG_LOG(SG_GENERAL, SG_WARN, "Internal: Unknown logging priority number: "
<< logbuf::get_log_priority());
return "unknown";
}
}
/**
* Set the logging priority.
*/
static void
setLoggingPriority (const char * p)
{
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.empty() || priority == "info") { // default
logbuf::set_log_priority(SG_INFO);
} else if (priority == "warn") {
logbuf::set_log_priority(SG_WARN);
} else if (priority == "alert") {
logbuf::set_log_priority(SG_ALERT);
} else {
SG_LOG(SG_GENERAL, SG_WARN, "Unknown logging priority " << priority);
}
SG_LOG(SG_GENERAL, SG_INFO, "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
FGSoundMgr *s = globals->get_soundmgr();
if ( s != NULL ) {
if ( f ) {
s->pause();
} else {
s->resume();
}
}
}
/**
* Return the current aircraft directory (UIUC) as a string.
*/
static const char *
getAircraftDir ()
{
return aircraft_dir.c_str();
}
/**
* Set the current aircraft directory (UIUC).
*/
static void
setAircraftDir (const char * dir)
{
aircraft_dir = dir;
}
/**
* Return the number of milliseconds elapsed since simulation started.
*/
static double
getElapsedTime_sec ()
{
return globals->get_sim_time_sec();
}
/**
* Return the current Zulu time.
*/
static const char *
getDateString ()
{
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);
return buf;
}
/**
* Set the current Zulu time.
*/
static void
setDateString (const char * date_string)
{
static const SGPropertyNode *cur_time_override
= fgGetNode("/sim/time/cur-time-override", true);
SGTime * st = globals->get_time_params();
struct tm * current_time = st->getGmt();
struct tm new_time;
// Scan for basic ISO format
// YYYY-MM-DDTHH:MM:SS
int ret = sscanf(date_string, "%d-%d-%dT%d:%d:%d",
&(new_time.tm_year), &(new_time.tm_mon),
&(new_time.tm_mday), &(new_time.tm_hour),
&(new_time.tm_min), &(new_time.tm_sec));
// Be pretty picky about this, so
// that strange things don't happen
// if the save file has been edited
// by hand.
if (ret != 6) {
SG_LOG(SG_INPUT, SG_ALERT, "Date/time string " << date_string
<< " not in YYYY-MM-DDTHH:MM:SS format; skipped");
return;
}
// OK, it looks like we got six
// values, one way or another.
new_time.tm_year -= 1900;
new_time.tm_mon -= 1;
// Now, tell flight gear to use
// the new time. This was far
// too difficult, by the way.
long int warp =
mktime(&new_time) - mktime(current_time) + globals->get_warp();
double lon = current_aircraft.fdm_state->get_Longitude();
double lat = current_aircraft.fdm_state->get_Latitude();
globals->set_warp(warp);
st->update(lon, lat, cur_time_override->getLongValue(), warp);
fgUpdateSkyAndLightingParams();
}
/**
* Return the GMT as a string.
*/
static const char *
getGMTString ()
{
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;
return buf;
}
/**
* Get the texture rendering state.
*/
static bool
getTextures ()
{
return (material_lib.get_step() == 0);
}
/**
* 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
*/
static double
getMagVar ()
{
return globals->get_mag()->get_magvar() * SGD_RADIANS_TO_DEGREES;
}
/**
* Return the magnetic dip
*/
static double
getMagDip ()
{
return globals->get_mag()->get_magdip() * SGD_RADIANS_TO_DEGREES;
}
/**
* Return the current heading in degrees.
*/
static double
getHeadingMag ()
{
return current_aircraft.fdm_state->get_Psi() * SGD_RADIANS_TO_DEGREES - getMagVar();
}
#ifdef FG_WEATHERCM
/**
* 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);
}
#endif // FG_WEATHERCM
static long
getWarp ()
{
return globals->get_warp();
}
static void
setWarp (long warp)
{
globals->set_warp(warp);
}
static long
getWarpDelta ()
{
return globals->get_warp_delta();
}
static void
setWarpDelta (long delta)
{
globals->set_warp_delta(delta);
}
static bool
getWindingCCW ()
{
return winding_ccw;
}
static void
setWindingCCW (bool state)
{
winding_ccw = state;
if ( winding_ccw )
glFrontFace ( GL_CCW );
else
glFrontFace ( GL_CW );
}
static bool
getFullScreen ()
{
#if defined(FX) && !defined(WIN32)
return globals->get_fullscreen();
#else
return false;
#endif
}
static void
setFullScreen (bool state)
{
#if defined(FX) && !defined(WIN32)
globals->set_fullscreen(state);
# if defined(XMESA_FX_FULLSCREEN) && defined(XMESA_FX_WINDOW)
XMesaSetFXmode( state ? XMESA_FX_FULLSCREEN : XMESA_FX_WINDOW );
# endif
#endif
}
static bool
getFDMDataLogging ()
{
return fdm_data_logging;
}
static void
setFDMDataLogging (bool state)
{
// kludge; no getter or setter available
if (state != fdm_data_logging) {
fgToggleFDMdataLogging();
fdm_data_logging = state;
}
}
////////////////////////////////////////////////////////////////////////
// Tie the properties.
////////////////////////////////////////////////////////////////////////
void
fgInitProps ()
{
cout << "start of fgInitProps()" << endl;
// Simulation
fgTie("/sim/logging/priority", getLoggingPriority, setLoggingPriority);
fgTie("/sim/logging/classes", getLoggingClasses, setLoggingClasses);
fgTie("/sim/freeze/master", getFreeze, setFreeze);
fgTie("/sim/aircraft-dir", getAircraftDir, setAircraftDir);
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
#ifdef FG_WEATHERCM
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);
fgTie("/sim/time/warp", getWarp, setWarp, false);
fgTie("/sim/time/warp-delta", getWarpDelta, setWarpDelta);
// Misc. Temporary junk.
fgTie("/sim/temp/winding-ccw", getWindingCCW, setWindingCCW, false);
fgTie("/sim/temp/full-screen", getFullScreen, setFullScreen);
fgTie("/sim/temp/fdm-data-logging", getFDMDataLogging, setFDMDataLogging);
cout << "end of fgInitProps()" << endl;
}
void
fgUpdateProps ()
{
}
////////////////////////////////////////////////////////////////////////
// Save and restore.
////////////////////////////////////////////////////////////////////////
/**
* Save the current state of the simulator to a stream.
*/
bool
fgSaveFlight (ostream &output, bool write_all)
{
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);
} catch (const sg_exception &e) {
guiErrorMessage("Error saving flight: ", e);
return false;
}
return true;
}
/**
* Restore the current state of the simulator from a stream.
*/
bool
fgLoadFlight (istream &input)
{
SGPropertyNode props;
try {
readProperties(input, &props);
} catch (const sg_exception &e) {
guiErrorMessage("Error reading saved flight: ", e);
return false;
}
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
// new initial state.
globals->saveInitialState();
return true;
}
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.
////////////////////////////////////////////////////////////////////////
SGPropertyNode *
fgGetNode (const char * path, bool create)
{
return globals->get_props()->getNode(path, create);
}
SGPropertyNode *
fgGetNode (const char * path, int index, bool create)
{
return globals->get_props()->getNode(path, index, create);
}
bool
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)
{
return globals->get_props()->getBoolValue(name, defaultValue);
}
int
fgGetInt (const char * name, int defaultValue)
{
return globals->get_props()->getIntValue(name, defaultValue);
}
int
fgGetLong (const char * name, long defaultValue)
{
return globals->get_props()->getLongValue(name, defaultValue);
}
float
fgGetFloat (const char * name, float defaultValue)
{
return globals->get_props()->getFloatValue(name, defaultValue);
}
double
fgGetDouble (const char * name, double defaultValue)
{
return globals->get_props()->getDoubleValue(name, defaultValue);
}
const char *
fgGetString (const char * name, const char * defaultValue)
{
return globals->get_props()->getStringValue(name, defaultValue);
}
bool
fgSetBool (const char * name, bool val)
{
return globals->get_props()->setBoolValue(name, val);
}
bool
fgSetInt (const char * name, int val)
{
return globals->get_props()->setIntValue(name, val);
}
bool
fgSetLong (const char * name, long val)
{
return globals->get_props()->setLongValue(name, val);
}
bool
fgSetFloat (const char * name, float val)
{
return globals->get_props()->setFloatValue(name, val);
}
bool
fgSetDouble (const char * name, double val)
{
return globals->get_props()->setDoubleValue(name, val);
}
bool
fgSetString (const char * name, const char * val)
{
return globals->get_props()->setStringValue(name, val);
}
void
fgSetArchivable (const char * name, bool state)
{
SGPropertyNode * node = globals->get_props()->getNode(name);
if (node == 0)
SG_LOG(SG_GENERAL, SG_ALERT,
"Attempt to set archive flag for non-existant property "
<< name);
else
node->setAttribute(SGPropertyNode::ARCHIVE, state);
}
void
fgSetReadable (const char * name, bool state)
{
SGPropertyNode * node = globals->get_props()->getNode(name);
if (node == 0)
SG_LOG(SG_GENERAL, SG_ALERT,
"Attempt to set read flag for non-existant property "
<< name);
else
node->setAttribute(SGPropertyNode::READ, state);
}
void
fgSetWritable (const char * name, bool state)
{
SGPropertyNode * node = globals->get_props()->getNode(name);
if (node == 0)
SG_LOG(SG_GENERAL, SG_ALERT,
"Attempt to set write flag for non-existant property "
<< name);
else
node->setAttribute(SGPropertyNode::WRITE, state);
}
void
fgUntie (const char * name)
{
if (!globals->get_props()->untie(name))
SG_LOG(SG_GENERAL, SG_WARN, "Failed to untie property " << 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