private void GroupByPriority(int priority)
{
if (components.First == null)
{
return;
}
var node = components.First.Next; // skipping to second component, which should be operator component
if (node == null)
{
return;
}
while (true)
{
IMathComponent component = node.Value;
if (component is OperatorComponent opComponent)
{
var prevComponent = node.Previous;
var nextComponent = node.Next;
if (nextComponent == null)
{
throw new InvalidExpressionSyntaxException("Invalid expression");
}
var nextOperator = nextComponent.Next;
if ((int)opComponent.Operator.ExecutionPriority == priority)
{
OperationComponent operation = new OperationComponent(new OperatorInstance(prevComponent.Value, nextComponent.Value, opComponent.Operator));
components.Remove(prevComponent);
components.Remove(nextComponent);
components.AddBefore(node, operation);
components.Remove(node);
}
if (nextOperator == null)
{
break;
}
node = nextOperator;
}
else
{
throw new InvalidExpressionSyntaxException("Operator expected");
}
}
}
/// <summary>
/// Converts Function and it's parameters to math component and inserts it into internal data structure.
/// </summary>
/// <param name="function">Function type</param>
/// <param name="funcExpression">Function parameter expression. Can be empty string if function has no parameters. Parameters must be separated by <see cref="Expressions.Function.FUNCTION_PARAMETER_SEPARATOR"/></param>
/// <param name="negative">Whether function result should be negative</param>
/// <param name="instanceCreator">Parser instance creator for parsing sub-expressions</param>
/// <returns>This builder</returns>
public ExpressionBuilder Function(Function function, string funcExpression, bool negative, ConstructNewParser instanceCreator)
{
string[] parameters;
if (funcExpression.Length == 0)
{
parameters = new string[0];
}
else
{
parameters = funcExpression.Split(Expressions.Function.FUNCTION_PARAMETER_SEPARATOR);
}
IMathComponent component = new OperationComponent(new FunctionInstance(function, parameters.Length == 0 ? new IMathComponent[0] : ConvertToComponents(parameters, instanceCreator)))
{
Negative = negative
};
components.AddLast(component);
return(this);
}