/// <summary>
/// Provides the value of the function
/// </summary>
/// <param name="context"></param>
/// <param name="actuals">the actual parameters values</param>
/// <param name="explain"></param>
/// <returns>The value for the function application</returns>
public override IValue Evaluate(InterpretationContext context, Dictionary<Actual, IValue> actuals,
ExplanationPart explain)
{
IValue retVal = null;
int token = context.LocalScope.PushContext();
AssignParameters(context, actuals);
Function function = context.FindOnStack(Function).Value as Function;
if (function != null)
{
double speed = GetDoubleValue(context.FindOnStack(Speed).Value);
Parameter parameter = (Parameter) function.FormalParameters[0];
int token2 = context.LocalScope.PushContext();
context.LocalScope.SetGraphParameter(parameter);
Graph graph = function.CreateGraph(context, (Parameter) function.FormalParameters[0], explain);
context.LocalScope.PopContext(token2);
if (graph != null)
{
double solutionX = graph.SolutionX(speed);
if (solutionX == double.MaxValue)
{
Range distanceType = (Range) EFSSystem.FindByFullName("Default.BaseTypes.Distance");
retVal = distanceType.findEnumValue("Unknown");
}
else
{
retVal = new DoubleValue(EFSSystem.DoubleType, solutionX);
}
}
else
{
Function.AddError("Cannot evaluate graph for function while computing the distance for the given speed");
}
}
else
{
Function.AddError("Cannot get function for " + Function);
}
context.LocalScope.PopContext(token);
return retVal;
}
/// <summary>
/// Provides the value of the function
/// </summary>
/// <param name="context"></param>
/// <param name="actuals">the actual parameters values</param>
/// <param name="explain"></param>
/// <returns>The value for the function application</returns>
public override IValue Evaluate(InterpretationContext context, Dictionary<Actual, IValue> actuals,
ExplanationPart explain)
{
IValue retVal = null;
int token = context.LocalScope.PushContext();
AssignParameters(context, actuals);
IValue value = context.FindOnStack(Value).Value;
if (value is Function)
{
retVal = value;
}
else
{
retVal = TargetType.convert(value);
}
context.LocalScope.PopContext(token);
return retVal;
}
/// <summary>
/// Provides the graph of this function if it has been statically defined
/// </summary>
/// <param name="context">the context used to create the graph</param>
/// <param name="parameter"></param>
/// <param name="explain"></param>
/// <returns></returns>
public virtual Graph CreateGraph(InterpretationContext context, Parameter parameter, ExplanationPart explain)
{
Graph retVal = Graph;
if (retVal == null)
{
try
{
InterpretationContext ctxt = new InterpretationContext(context);
if (Cases.Count > 0)
{
// For now, just create graphs for functions using 0 or 1 parameter.
if (FormalParameters.Count == 0)
{
IValue value = Evaluate(ctxt, new Dictionary<Actual, IValue>(), explain);
retVal = Graph.createGraph(value, parameter, explain);
}
else if (FormalParameters.Count == 1)
{
Parameter param = (Parameter) FormalParameters[0];
int token = ctxt.LocalScope.PushContext();
IValue actualValue = null;
if (parameter != null)
{
IVariable actual = ctxt.FindOnStack(parameter);
if (actual != null)
{
actualValue = actual.Value;
}
else
{
actualValue = new PlaceHolder(parameter.Type, 1);
}
ctxt.LocalScope.SetParameter(param, actualValue);
}
retVal = CreateGraphForParameter(ctxt, param, explain);
if (getCacheable() && actualValue is PlaceHolder)
{
Graph = retVal;
}
ctxt.LocalScope.PopContext(token);
}
else
{
IValue value = Evaluate(ctxt, new Dictionary<Actual, IValue>(), explain);
retVal = Graph.createGraph(value, parameter, explain);
}
}
}
catch (Exception e)
{
AddError("Cannot create graph of function, reason : " + e.Message);
}
}
return retVal;
}
/// <summary>
/// Provides the surface of this function if it has been statically defined
/// </summary>
/// <param name="context">the context used to create the surface</param>
/// <param name="explain"></param>
/// <returns></returns>
public override Surface CreateSurface(InterpretationContext context, ExplanationPart explain)
{
Surface retVal = null;
IValue firstValue = context.FindOnStack(First).Value;
IValue secondValue = context.FindOnStack(Second).Value;
Surface firstSurface = createSurfaceForValue(context, firstValue, explain);
if (firstSurface != null)
{
Surface secondSurface = createSurfaceForValue(context, secondValue, explain);
if (secondSurface != null)
{
retVal = firstSurface.Min(secondSurface);
}
else
{
Second.AddError("Cannot create surface for " + Second);
}
}
else
{
First.AddError("Cannot create surface for " + First);
}
return retVal;
}
/// <summary>
/// Provides the value of the function
/// </summary>
/// <param name="context"></param>
/// <param name="actuals">the actual parameters values</param>
/// <param name="explain"></param>
/// <returns>The value for the function application</returns>
public override IValue Evaluate(InterpretationContext context, Dictionary<Actual, IValue> actuals,
ExplanationPart explain)
{
IValue retVal = null;
int token = context.LocalScope.PushContext();
AssignParameters(context, actuals);
BoolValue val = context.FindOnStack(Value).Value as BoolValue;
if (val != null)
{
if (val.Val)
{
retVal = EFSSystem.BoolType.False;
}
else
{
retVal = EFSSystem.BoolType.True;
}
}
context.LocalScope.PopContext(token);
return retVal;
}
/// <summary>
/// Provides the value of the function
/// </summary>
/// <param name="context"></param>
/// <param name="actuals">the actual parameters values</param>
/// <param name="explain"></param>
/// <returns>The value for the function application</returns>
public override IValue Evaluate(InterpretationContext context, Dictionary<Actual, IValue> actuals,
ExplanationPart explain)
{
IValue retVal = null;
int token = context.LocalScope.PushContext();
AssignParameters(context, actuals);
Collection collectionType =
(Collection)
EFSSystem.FindType(
OverallNameSpaceFinder.INSTANCE.findByName(EFSSystem.Dictionaries[0],
"Default"),
"TargetsCol");
ListValue collection = new ListValue(collectionType, new List<IValue>());
// compute targets from the MRSP
Function function1 = context.FindOnStack(SpeedRestrictions).Value as Function;
if (function1 != null && !function1.Name.Equals("EMPTY"))
{
Graph graph1 = createGraphForValue(context, function1, explain);
ComputeTargets(graph1.Function, collection);
}
context.LocalScope.PopContext(token);
retVal = collection;
return retVal;
}
/// <summary>
/// Provides the value of the function
/// </summary>
/// <param name="context"></param>
/// <param name="actuals">the actual parameters values</param>
/// <param name="explain"></param>
/// <returns>The value for the function application</returns>
public override IValue Evaluate(InterpretationContext context, Dictionary<Actual, IValue> actuals,
ExplanationPart explain)
{
IValue retVal = null;
int token = context.LocalScope.PushContext();
AssignParameters(context, actuals);
DoubleValue value = context.FindOnStack(Value).Value as DoubleValue;
DoubleValue multiple = context.FindOnStack(Multiple).Value as DoubleValue;
if (value != null && multiple != null)
{
double res = Math.Floor(value.Val);
while (res > 0 && res%multiple.Val != 0)
{
res--;
}
retVal = new DoubleValue(ReturnType, res);
}
context.LocalScope.PopContext(token);
return retVal;
}
/// <summary>
/// Provides the value of the function
/// </summary>
/// <param name="context"></param>
/// <param name="actuals">the actual parameters values</param>
/// <param name="explain"></param>
/// <returns>The value for the function application</returns>
public override IValue Evaluate(InterpretationContext context, Dictionary<Actual, IValue> actuals,
ExplanationPart explain)
{
IValue retVal = null;
AssignParameters(context, actuals);
Graph graph = createGraphForValue(context, context.FindOnStack(FunctionA).Value, explain);
if (graph != null)
{
foreach (Graph.Segment segment in graph.Segments)
{
if (segment.Expression.A == 0.0)
{
double speed = segment.Expression.V0;
Function function = context.FindOnStack(FunctionB).Value as Function;
if (function.FormalParameters.Count > 0)
{
Parameter functionParameter = (Parameter) function.FormalParameters[0];
Actual actual = functionParameter.CreateActual();
actual.Value = new DoubleValue(EFSSystem.DoubleType, speed);
Dictionary<Actual, IValue> values = new Dictionary<Actual, IValue>();
values[actual] = new DoubleValue(EFSSystem.DoubleType, speed);
IValue solution = function.Evaluate(context, values, explain);
double doubleValue = GetDoubleValue(solution);
if (doubleValue >= segment.Start && doubleValue <= segment.End)
{
retVal = new DoubleValue(EFSSystem.DoubleType, doubleValue);
break;
}
}
else
{
FunctionB.AddError("The FunctionB doesn't have any parameter");
break;
}
}
else
{
FunctionA.AddError("The FunctionA is not a step function");
break;
}
}
}
else
{
FunctionA.AddError("Cannot create graph for " + FunctionA);
}
if (retVal == null)
{
FunctionA.AddError("Cannot compute the intersection of " + FunctionA + " and " + FunctionB);
FunctionB.AddError("Cannot compute the intersection of " + FunctionA + " and " + FunctionB);
}
return retVal;
}
/// <summary>
/// Provides the value of the function
/// </summary>
/// <param name="context"></param>
/// <param name="actuals">the actual parameters values</param>
/// <param name="explain"></param>
/// <returns>The value for the function application</returns>
public override IValue Evaluate(InterpretationContext context, Dictionary<Actual, IValue> actuals,
ExplanationPart explain)
{
IValue retVal = null;
int token = context.LocalScope.PushContext();
AssignParameters(context, actuals);
ListValue value = context.FindOnStack(Collection) as ListValue;
if (value != null)
{
Collection collectionType = value.Type as Collection;
if (collectionType != null && collectionType.Type != null)
{
Type elementType = collectionType.Type;
int i = 0;
while (i < value.Val.Count && value.Val[i] != EFSSystem.EmptyValue)
{
i += 1;
}
if (i < value.Val.Count)
{
retVal = elementType.DefaultValue;
value.Val[i] = retVal;
}
else
{
AddError("Cannot allocate element in list : list full");
}
}
}
context.LocalScope.PopContext(token);
return retVal;
}
/// <summary>
/// Provides the graph of this function if it has been statically defined
/// </summary>
/// <param name="context">the context used to create the graph</param>
/// <param name="parameter"></param>
/// <param name="explain"></param>
/// <returns></returns>
public override Graph CreateGraph(InterpretationContext context, Parameter parameter, ExplanationPart explain)
{
Graph retVal = null;
Graph graph = null;
Function function = context.FindOnStack(Function).Value as Function;
if (function != null)
{
int token = context.LocalScope.PushContext();
Parameter p = (Parameter) function.FormalParameters[0];
context.LocalScope.SetGraphParameter(p);
graph = createGraphForValue(context, function, explain, p);
context.LocalScope.PopContext(token);
}
if (graph != null)
{
Function increment = context.FindOnStack(Increment).Value as Function;
retVal = graph.AddIncrement(context, increment, explain);
}
else
{
Function.AddError("Cannot create graph for " + Function);
}
return retVal;
}
/// <summary>
/// Provides the graph of this function if it has been statically defined
/// </summary>
/// <param name="context">the context used to create the graph</param>
/// <param name="parameter"></param>
/// <param name="explain"></param>
/// <returns></returns>
public override Graph CreateGraph(InterpretationContext context, Parameter parameter, ExplanationPart explain)
{
Graph retVal = null;
IValue firstValue = context.FindOnStack(First).Value;
IValue secondValue = context.FindOnStack(Second).Value;
Graph firstGraph = createGraphForValue(context, firstValue, explain, parameter);
if (firstGraph != null)
{
Graph secondGraph = createGraphForValue(context, secondValue, explain, parameter);
if (secondGraph != null)
{
retVal = firstGraph.Max(secondGraph) as Graph;
}
else
{
Second.AddError("Cannot create graph for " + Second);
}
}
else
{
First.AddError("Cannot create graph for " + First);
}
return retVal;
}
/// <summary>
/// Provides the value of the function
/// </summary>
/// <param name="context"></param>
/// <param name="actuals">the actual parameters values</param>
/// <param name="explain"></param>
/// <returns>The value for the function application</returns>
public override IValue Evaluate(InterpretationContext context, Dictionary<Actual, IValue> actuals,
ExplanationPart explain)
{
IValue retVal = null;
int token = context.LocalScope.PushContext();
AssignParameters(context, actuals);
DoubleValue value = context.FindOnStack(Value).Value as DoubleValue;
if (value != null)
{
int res = (int) Math.Round(value.Val);
retVal = new IntValue(ReturnType, res);
}
context.LocalScope.PopContext(token);
return retVal;
}
/// <summary>
/// Creates a graph for the function
/// </summary>
/// <param name="context"></param>
/// <param name="parameter"></param>
/// <param name="explain"></param>
/// <returns></returns>
public override Graph CreateGraph(InterpretationContext context, Parameter parameter, ExplanationPart explain)
{
Graph retVal = new Graph();
StructureValue LocationStruct = context.FindOnStack(Target).Value as StructureValue;
SiDistance location;
SiSpeed speed;
if (LocationStruct != null)
{
IVariable locationField = LocationStruct.Val["Location"] as IVariable;
location = new SiDistance((locationField.Value as DoubleValue).Val);
IVariable speedField = LocationStruct.Val["Speed"] as IVariable;
speed = new SiSpeed((speedField.Value as DoubleValue).Val, SiSpeed_SubUnits.KiloMeter_per_Hour);
Function decelerationFactor = context.FindOnStack(DecelerationFactor).Value as Function;
if (decelerationFactor != null)
{
Surface DecelerationSurface = decelerationFactor.CreateSurface(context, explain);
if (DecelerationSurface != null)
{
AccelerationSpeedDistanceSurface accelerationSurface =
DecelerationSurface.createAccelerationSpeedDistanceSurface(double.MaxValue, double.MaxValue);
QuadraticSpeedDistanceCurve BrakingCurve = null;
try
{
BrakingCurve = EtcsBrakingCurveBuilder.Build_Deceleration_Curve(accelerationSurface, speed,
location);
}
catch (Exception e)
{
retVal.AddSegment(new Graph.Segment(0, double.MaxValue, new Graph.Segment.Curve(0, 0, 0)));
}
SiSpeed finalSpeed = new SiSpeed(GetDoubleValue(context.FindOnStack(EndSpeed).Value),
SiSpeed_SubUnits.KiloMeter_per_Hour);
for (int i = 0; i < BrakingCurve.SegmentCount; i++)
{
QuadraticCurveSegment segment = BrakingCurve[i];
SiSpeed endSpeed = Max(finalSpeed, segment.Get(segment.X.X1));
SiDistance endDistance;
if (endSpeed == finalSpeed)
{
// Ensures that a braking curve is calculated until the finalSpeed
// but not further than the end of the curve segment
SiSpeed tmp = Max(segment.Get(segment.X.X1),
endSpeed - new SiSpeed(0.001));
endDistance = segment.IntersectAt(tmp);
}
else
{
endDistance = segment.X.X1;
}
Graph.Segment newSegment = new Graph.Segment(
segment.X.X0.ToUnits(),
endDistance.ToUnits(),
new Graph.Segment.Curve(
segment.A.ToSubUnits(SiAcceleration_SubUnits.Meter_per_SecondSquare),
segment.V0.ToSubUnits(SiSpeed_SubUnits.KiloMeter_per_Hour),
segment.D0.ToSubUnits(SiDistance_SubUnits.Meter)
)
);
retVal.AddSegment(newSegment);
if (endSpeed == finalSpeed)
{
break;
}
}
}
}
}
return retVal;
}
/// <summary>
/// Provides the graph of this function if it has been statically defined
/// </summary>
/// <param name="context">the context used to create the graph</param>
/// <param name="parameter"></param>
/// <param name="explain"></param>
/// <returns></returns>
public override Graph CreateGraph(InterpretationContext context, Parameter parameter, ExplanationPart explain)
{
Graph retVal = null;
IVariable variable = context.FindOnStack(Value);
if (variable != null)
{
retVal = Graph.createGraph(GetDoubleValue(variable.Value), parameter);
}
else
{
AddError("Cannot find variable " + Value + " on the stack");
}
return retVal;
}
/// <summary>
/// Provides the value of the function
/// </summary>
/// <param name="context"></param>
/// <param name="actuals">the actual parameters values</param>
/// <param name="explain"></param>
/// <returns>The value for the function application</returns>
public override IValue Evaluate(InterpretationContext context, Dictionary<Actual, IValue> actuals,
ExplanationPart explain)
{
IValue retVal = null;
int token = context.LocalScope.PushContext();
AssignParameters(context, actuals);
Collection collectionType =
(Collection)
EFSSystem.FindType(
OverallNameSpaceFinder.INSTANCE.findByName(EFSSystem.Dictionaries[0],
"Kernel.SpeedAndDistanceMonitoring.TargetSpeedMonitoring"),
"Kernel.SpeedAndDistanceMonitoring.TargetSpeedMonitoring.Targets");
ListValue collection = new ListValue(collectionType, new List<IValue>());
Function function = context.FindOnStack(Targets).Value as Function;
if (function != null && !function.Name.Equals("EMPTY"))
{
Graph graph1 = createGraphForValue(context, function, explain);
ComputeTargets(graph1.Function, collection);
}
context.LocalScope.PopContext(token);
retVal = collection;
return retVal;
}
/// <summary>
/// Provides the value of the function
/// </summary>
/// <param name="context"></param>
/// <param name="actuals">the actual parameters values</param>
/// <param name="explain"></param>
/// <returns>The value for the function application</returns>
public override IValue Evaluate(InterpretationContext context, Dictionary<Actual, IValue> actuals,
ExplanationPart explain)
{
IValue retVal = EFSSystem.BoolType.False;
int token = context.LocalScope.PushContext();
AssignParameters(context, actuals);
ListValue collection = context.FindOnStack(Collection).Value as ListValue;
if (collection != null)
{
IValue expectedFirst = context.FindOnStack(ExpectedFirst).Value;
if (expectedFirst != null)
{
int firstIndex = collection.Val.IndexOf(expectedFirst);
if (firstIndex >= 0)
{
IValue expectedSecond = context.FindOnStack(ExpectedSecond).Value;
if (expectedSecond != null)
{
int secondIndex = collection.Val.IndexOf(expectedSecond);
if (secondIndex >= 0)
{
if (firstIndex < secondIndex)
{
retVal = EFSSystem.BoolType.True;
}
}
else
{
Collection.AddError("Cannot find " + expectedSecond.FullName + " in " +
collection.ToString() + " to evaluate " + Name);
}
}
else
{
Collection.AddError("Cannot evaluate second element to evaluate " + Name);
}
}
else
{
Collection.AddError("Cannot find " + expectedFirst.FullName + " in " + collection.ToString() +
" to evaluate " + Name);
}
}
else
{
Collection.AddError("Cannot evaluate first element to evaluate " + Name);
}
}
context.LocalScope.PopContext(token);
return retVal;
}
/// <summary>
/// Gets the unbound parameters from the function definition and place holders
/// </summary>
/// <param name="context"></param>
/// <param name="function"></param>
/// <returns></returns>
private List<Parameter> getUnboundParameter(InterpretationContext context, Function function)
{
List<Parameter> retVal = new List<Parameter>();
if (function != null)
{
foreach (Parameter formal in function.FormalParameters)
{
IVariable actual = context.FindOnStack(formal);
if (actual != null)
{
PlaceHolder placeHolder = actual.Value as PlaceHolder;
if (placeHolder != null)
{
retVal.Add(formal);
}
}
}
}
return retVal;
}
/// <summary>
/// Provides the graph of this function if it has been statically defined
/// </summary>
/// <param name="context">the context used to create the graph</param>
/// <param name="parameter"></param>
/// <param name="explain"></param>
/// <returns></returns>
public override Graph CreateGraph(InterpretationContext context, Parameter parameter, ExplanationPart explain)
{
Graph retVal = null;
Graph mrspGraph = null;
Function speedRestriction = context.FindOnStack(SpeedRestrictions).Value as Function;
if (speedRestriction != null)
{
Parameter p = (Parameter) speedRestriction.FormalParameters[0];
int token = context.LocalScope.PushContext();
context.LocalScope.SetGraphParameter(p);
mrspGraph = createGraphForValue(context, context.FindOnStack(SpeedRestrictions).Value, explain, p);
context.LocalScope.PopContext(token);
}
if (mrspGraph != null)
{
Function deceleratorFactor = context.FindOnStack(DecelerationFactor).Value as Function;
if (deceleratorFactor != null)
{
Surface decelerationSurface = deceleratorFactor.CreateSurface(context, explain);
if (decelerationSurface != null)
{
FlatSpeedDistanceCurve mrspCurve = mrspGraph.FlatSpeedDistanceCurve(mrspGraph.ExpectedEndX());
AccelerationSpeedDistanceSurface accelerationSurface =
decelerationSurface.createAccelerationSpeedDistanceSurface(double.MaxValue, double.MaxValue);
QuadraticSpeedDistanceCurve brakingCurve = null;
try
{
brakingCurve = EtcsBrakingCurveBuilder.Build_A_Safe_Backward(accelerationSurface, mrspCurve);
}
catch (Exception)
{
retVal = new Graph();
retVal.AddSegment(new Graph.Segment(0, double.MaxValue, new Graph.Segment.Curve(0, 0, 0)));
}
if (brakingCurve != null)
{
retVal = new Graph();
// TODO : Remove the distinction between linear curves and quadratic curves
bool isLinear = true;
for (int i = 0; i < brakingCurve.SegmentCount; i++)
{
QuadraticCurveSegment segment = brakingCurve[i];
if (segment.A.ToUnits() != 0.0 || segment.V0.ToUnits() != 0.0)
{
isLinear = false;
break;
}
}
for (int i = 0; i < brakingCurve.SegmentCount; i++)
{
QuadraticCurveSegment segment = brakingCurve[i];
Graph.Segment newSegment;
if (isLinear)
{
newSegment = new Graph.Segment(
segment.X.X0.ToUnits(),
segment.X.X1.ToUnits(),
new Graph.Segment.Curve(0.0,
segment.V0.ToSubUnits(SiSpeed_SubUnits.KiloMeter_per_Hour), 0.0));
}
else
{
newSegment = new Graph.Segment(
segment.X.X0.ToUnits(),
segment.X.X1.ToUnits(),
new Graph.Segment.Curve(
segment.A.ToSubUnits(SiAcceleration_SubUnits.Meter_per_SecondSquare),
segment.V0.ToSubUnits(SiSpeed_SubUnits.KiloMeter_per_Hour),
segment.D0.ToSubUnits(SiDistance_SubUnits.Meter)
)
);
}
retVal.AddSegment(newSegment);
}
}
}
else
{
DecelerationFactor.AddError("Cannot create surface for " + DecelerationFactor);
}
}
else
{
DecelerationFactor.AddError("Cannot evaluate " + DecelerationFactor + " as a function");
}
}
else
{
SpeedRestrictions.AddError("Cannot create graph for " + SpeedRestrictions);
}
return retVal;
}
/// <summary>
/// Provides the value of the function
/// </summary>
/// <param name="context"></param>
/// <param name="actuals">the actual parameters values</param>
/// <param name="explain"></param>
/// <returns>The value for the function application</returns>
public override IValue Evaluate(InterpretationContext context, Dictionary<Actual, IValue> actuals,
ExplanationPart explain)
{
IValue retVal = null;
int token = context.LocalScope.PushContext();
AssignParameters(context, actuals);
StructureValue startDate = context.FindOnStack(StartDate).Value as StructureValue;
if (startDate != null)
{
int year = GetIntValue(startDate, "Year");
int month = GetIntValue(startDate, "Month");
int day = GetIntValue(startDate, "Day");
int hour = GetIntValue(startDate, "Hour");
int minute = GetIntValue(startDate, "Minute");
int second = GetIntValue(startDate, "Second");
int tts = GetIntValue(startDate, "TTS");
DoubleValue addedTime = context.FindOnStack(Increment).Value as DoubleValue;
if (addedTime != null)
{
DateTime start = new DateTime(year, month, day, hour, minute, second, tts);
DateTime currentTime = start.AddSeconds(addedTime.Val);
retVal = GetEfsDate(currentTime, startDate.Type as Structure);
}
}
context.LocalScope.PopContext(token);
return retVal;
}
/// <summary>
/// Provides the value of the function
/// </summary>
/// <param name="context"></param>
/// <param name="actuals">the actual parameters values</param>
/// <param name="explain"></param>
/// <returns>The value for the function application</returns>
public override IValue Evaluate(InterpretationContext context, Dictionary<Actual, IValue> actuals,
ExplanationPart explain)
{
StringValue retVal = null;
int token = context.LocalScope.PushContext();
AssignParameters(context, actuals);
StringValue string1 = context.FindOnStack(String1).Value as StringValue;
StringValue string2 = context.FindOnStack(String2).Value as StringValue;
if (string1 != null && string2 != null)
{
retVal = new StringValue(EfsSystem.Instance.StringType, string1.Val + string2.Val);
}
context.LocalScope.PopContext(token);
return retVal;
}
/// <summary>
/// Provides the surface of this function if it has been statically defined
/// </summary>
/// <param name="context">the context used to create the surface</param>
/// <param name="explain"></param>
/// <returns></returns>
public override Surface CreateSurface(InterpretationContext context, ExplanationPart explain)
{
Surface retVal = null;
Surface defaultSurface = createSurfaceForValue(context, context.FindOnStack(DefaultFunction).Value, explain);
if (defaultSurface != null)
{
Surface overrideSurface = createSurfaceForValue(context, context.FindOnStack(OverrideFunction).Value,
explain);
if (overrideSurface != null)
{
retVal = defaultSurface.Override(overrideSurface);
}
else
{
OverrideFunction.AddError("Cannot create graph for OVERRIDE argument");
}
}
else
{
DefaultFunction.AddError("Cannot create graph for DEFAULT argument");
}
return retVal;
}
/// <summary>
/// Indicates whether the expression is based on a placeholder value, ommiting the parameter provided
/// </summary>
/// <param name="context">The current interpretation context</param>
/// <param name="expression">The expression to evaluate</param>
/// <returns></returns>
private bool ExpressionBasedOnPlaceHolder(InterpretationContext context, BinaryExpression expression)
{
bool retVal = false;
if (expression != null)
{
foreach (ITypedElement element in expression.GetRightSides())
{
Parameter parameter = element as Parameter;
if (parameter != null)
{
IVariable variable = context.FindOnStack(parameter);
if (variable != null)
{
PlaceHolder placeHolder = variable.Value as PlaceHolder;
if (placeHolder != null)
{
retVal = true;
break;
}
}
}
}
}
return retVal;
}
/// <summary>
/// Provides the graph of this function if it has been statically defined
/// </summary>
/// <param name="context">the context used to create the graph</param>
/// <param name="parameter"></param>
/// <param name="explain"></param>
/// <returns></returns>
public override Graph CreateGraph(InterpretationContext context, Parameter parameter, ExplanationPart explain)
{
Graph retVal = null;
Graph graph = createGraphForValue(context, context.FindOnStack(Function).Value, explain, parameter);
if (graph != null)
{
double speed = GetDoubleValue(context.FindOnStack(Speed).Value);
double solutionX = graph.SolutionX(speed);
if (solutionX == double.MaxValue)
{
// No value found, return Unknown
Range distanceType = (Range) EFSSystem.FindByFullName("Default.BaseTypes.Distance");
EnumValue unknownDistance = distanceType.findEnumValue("Unknown");
retVal = Graph.createGraph(distanceType.getValueAsDouble(unknownDistance));
}
else
{
// Create the graph for this solution
retVal = Graph.createGraph(solutionX);
}
}
else
{
Function.AddError("Cannot create graph for " + Function);
}
return retVal;
}
/// <summary>
/// Provides the value of the function
/// </summary>
/// <param name="context"></param>
/// <param name="actuals">the actual parameters values</param>
/// <param name="explain"></param>
/// <returns>The value for the function application</returns>
public override IValue Evaluate(InterpretationContext context, Dictionary<Actual, IValue> actuals,
ExplanationPart explain)
{
IValue retVal = EFSSystem.BoolType.False;
int token = context.LocalScope.PushContext();
AssignParameters(context, actuals);
if (context.FindOnStack(Element).Value != EFSSystem.EmptyValue)
{
retVal = EFSSystem.BoolType.True;
}
context.LocalScope.PopContext(token);
return retVal;
}
/// <summary>
/// Provides the value of the function
/// </summary>
/// <param name="context"></param>
/// <param name="actuals">the actual parameters values</param>
/// <param name="explain"></param>
/// <returns>The value for the function application</returns>
public override IValue Evaluate(InterpretationContext context, Dictionary<Actual, IValue> actuals,
ExplanationPart explain)
{
IValue retVal = null;
int token = context.LocalScope.PushContext();
AssignParameters(context, actuals);
ListValue value = context.FindOnStack(Collection) as ListValue;
if (value != null)
{
Collection collectionType = value.Type as Collection;
if (collectionType != null && collectionType.Type != null)
{
Type elementType = collectionType.Type;
if (value.Val.Count >= collectionType.getMaxSize())
{
AddError("Cannot allocate element in list : list full");
}
else
{
retVal = elementType.DefaultValue;
value.Val.Add(retVal);
}
}
}
context.LocalScope.PopContext(token);
return retVal;
}