/// <summary>
/// Collects used numeric functions in the given numeric expression.
/// </summary>
/// <param name="expression">Numeric expression.</param>
/// <returns>Collected numeric functions.</returns>
public HashSet <NumericFunction> Collect(INumericExpression expression)
{
Debug.Assert(NumericFunctions.Count == 0);
NumericFunctions.Clear();
expression.Accept(this);
HashSet <NumericFunction> result = NumericFunctions;
NumericFunctions = new HashSet <NumericFunction>();
return(result);
}
/// <summary>
/// Replaces numeric function instances in the given numeric expression and the whole expression is partially or fully reduced.
/// </summary>
/// <param name="numericExpression">Numeric expression to be evaluated.</param>
/// <returns>Transformed numeric expression.</returns>
public INumericExpression Replace(INumericExpression numericExpression)
{
return(numericExpression.Accept(this));
}
/// <summary>
/// Grounds the expression.
/// </summary>
/// <param name="numericExpression">Numeric expression.</param>
/// <param name="substitution">Variables substitution.</param>
/// <returns>Grounded expression.</returns>
public INumericExpression Ground(INumericExpression numericExpression, ISubstitution substitution)
{
Substitution = substitution;
return(numericExpression.Accept(this));
}
/// <summary>
/// Evaluates numeric expression.
/// </summary>
/// <param name="expression">Numeric expression.</param>
/// <param name="substitution">Variable substitution.</param>
/// <param name="referenceState">Reference state.</param>
/// <returns>Evaluated numeric value.</returns>
public double Evaluate(INumericExpression expression, ISubstitution substitution, IState referenceState)
{
Substitution = substitution;
ReferenceState = referenceState;
return(expression.Accept(this));
}