/// <summary>
/// Evaluates the expression given a variable resolver.
/// </summary>
/// <param name="resolver">An object used to resolve variables that appear in the expression</param>
/// <returns>True if the expression was true, false otherwise</returns>
public bool Evaluate(IBooleanVariableResolver resolver)
{
if (Operands.Count == 0)
{
throw new ArgumentException("Nothing to evaluate");
}
if (Operators.Count != Operands.Count - 1)
{
throw new ArgumentException("Unexpected number of operators");
}
int operatorIndex = 0;
foreach (var operand in Operands)
{
var currentValue = operand.Evaluate(resolver);
if (operatorIndex <= Operators.Count - 1)
{
var currentOperator = Operators[operatorIndex++];
if (currentValue == true && currentOperator == BooleanOperator.Or)
{
return(Not ? false : true);
}
else if (currentValue == false && currentOperator == BooleanOperator.And)
{
return(Not ? true : false);
}
}
else
{
return(Not ? !currentValue : currentValue);
}
}
throw new ArgumentException("This should never happen :)");
}
/// <summary>
/// Uses the given resolver to resolve the target boolean variable
/// </summary>
/// <param name="resolver">The object used to resolve boolean variables</param>
/// <returns>the result of the resolver</returns>
public bool Evaluate(IBooleanVariableResolver resolver)
{
bool val = resolver.ResolveBoolean(this.VariableName);
return Not ? !val : val;
}
/// <summary>
/// Uses the given resolver to resolve the target boolean variable
/// </summary>
/// <param name="resolver">The object used to resolve boolean variables</param>
/// <returns>the result of the resolver</returns>
public bool Evaluate(IBooleanVariableResolver resolver)
{
bool val = resolver.ResolveBoolean(this.VariableName);
return(Not ? !val : val);
}
/// <summary>
/// Evaluates the expression given a variable resolver.
/// </summary>
/// <param name="resolver">An object used to resolve variables that appear in the expression</param>
/// <returns>True if the expression was true, false otherwise</returns>
public bool Evaluate(IBooleanVariableResolver resolver)
{
if (Operands.Count == 0)
{
throw new ArgumentException("Nothing to evaluate");
}
if (Operators.Count != Operands.Count - 1)
{
throw new ArgumentException("Unexpected number of operators");
}
int operatorIndex = 0;
foreach (var operand in Operands)
{
var currentValue = operand.Evaluate(resolver);
if (operatorIndex <= Operators.Count - 1)
{
var currentOperator = Operators[operatorIndex++];
if (currentValue == true && currentOperator == BooleanOperator.Or)
{
return Not ? false : true;
}
else if (currentValue == false && currentOperator == BooleanOperator.And)
{
return Not ? true : false;
}
}
else
{
return Not ? !currentValue : currentValue;
}
}
throw new ArgumentException("This should never happen :)");
}
