//=========================================================================================
bool BinaryOperationEvaluator::EvaluateOperands( Number*& leftNumber, Number*& rightNumber, Environment& environment )
{
bool success = false;
leftNumber = 0;
rightNumber = 0;
do
{
if( !leftOperand )
{
environment.AddError( "Binary operator has no left operand." );
break;
}
if( !rightOperand )
{
environment.AddError( "Binary operator has no right operand." );
break;
}
// Call upon the environment to create the types of numbers we'll be working with.
leftNumber = environment.CreateNumber( this );
rightNumber = environment.CreateNumber( this );
if( !( leftNumber && rightNumber ) )
{
environment.AddError( "Failed to create numbers from environment for binary operation." );
break;
}
// Evaluate our left and right operands.
if( !leftOperand->EvaluateResult( *leftNumber, environment ) )
{
environment.AddError( "Failed to evaluate left operand of binary operator." );
break;
}
if( !rightOperand->EvaluateResult( *rightNumber, environment ) )
{
environment.AddError( "Failed to evaluate right operand of binary operator." );
break;
}
success = true;
}
while( false );
if( !success )
{
delete leftNumber;
delete rightNumber;
leftNumber = 0;
rightNumber = 0;
}
return success;
}
//=========================================================================================
void TaylorSeriesFunctionEvaluator::Center( const Number* number, Environment& environment )
{
if( center )
delete center;
center = environment.CreateNumber(0);
center->AssignFrom( number, environment );
}
//=========================================================================================
/*virtual*/ bool InverseFunctionEvaluator::EvaluateResult( Number& result, Environment& environment )
{
bool success = false;
Number* argumentResult = 0;
do
{
FunctionArgumentEvaluator* argument = GetArgument(0);
if( !argument )
{
environment.AddError( "The inverse function expects an argument." );
break;
}
argumentResult = environment.CreateNumber( argument );
if( !argument->EvaluateResult( *argumentResult, environment ) )
break;
if( !result.IsTypeOf( MultivectorNumber::ClassName() ) )
break;
if( !result.AssignMultilicativeInverse( argumentResult, environment ) )
{
environment.AddError( "Failed to take the inverse!" );
break;
}
success = true;
}
while( false );
delete argumentResult;
return success;
}
//=========================================================================================
// It is very important that we evaluate the arguments from left to right, because
// this is the expected behavior of the language.
bool FunctionEvaluator::EvaluateArguments( Number**& numberArray, int& numberArraySize, Environment& environment )
{
bool success = false;
do
{
// Some functions don't take any arguments.
// If this one does, then go evaluate those arguments.
numberArray = 0;
numberArraySize = listOfArguments.Count();
if( numberArraySize > 0 )
{
numberArray = new Number*[ numberArraySize ];
memset( numberArray, 0, numberArraySize * sizeof( Number* ) );
// Go populate the number array with the argument list evaluation results.
FunctionArgumentEvaluator* evaluator = ( FunctionArgumentEvaluator* )listOfArguments.LeftMost();
int index;
for( index = 0; index < numberArraySize; index++ )
{
if( !evaluator )
break;
Number* number = environment.CreateNumber( this );
numberArray[ index ] = number;
if( !evaluator->EvaluateResult( *number, environment ) )
break;
evaluator = ( FunctionArgumentEvaluator* )evaluator->Right();
}
if( index < numberArraySize )
break;
}
success = true;
}
while( false );
// It's all or nothing. If we failed, don't return anything.
if( !success )
DeleteArguments( numberArray, numberArraySize );
return success;
}
//=========================================================================================
bool UnaryOperationEvaluator::EvaluateOperand( Number*& number, Environment& environment )
{
bool success = false;
do
{
if( !operand )
{
environment.AddError( "Unary operator has no argument." );
break;
}
// Call upon the environment to create the type of number we'll be working with.
number = environment.CreateNumber( operand );
if( !number )
{
environment.AddError( "Failed to create number from environment for unary operator." );
break;
}
// Evaluate our operand.
if( !operand->EvaluateResult( *number, environment ) )
{
environment.AddError( "Unary operand operand evaluation failed." );
break;
}
success = true;
}
while( false );
if( !success )
{
delete number;
number = 0;
}
return success;
}
