private static bool TryParseExpressionUnit(string expressionItem, OperationType operationType, IMathOperationsContainer mathOperationsContainer, out ExpressionUnit expressionUnit)
{
var keyword = mathOperationsContainer.GetKeywordOrDefault(new OperationCharacteristics(expressionItem, operationType));
if (!string.IsNullOrEmpty(keyword))
{
expressionUnit = new OperationExpressionUnit(expressionItem, keyword);
return(true);
}
var leftBracketExpressionUnit = new LeftBracketExpressionUnit();
if (expressionItem == leftBracketExpressionUnit.Keyword)
{
expressionUnit = leftBracketExpressionUnit;
return(true);
}
var rightBracketExpressionUnit = new RightBracketExpressionUnit();
if (expressionItem == rightBracketExpressionUnit.Keyword)
{
expressionUnit = rightBracketExpressionUnit;
return(true);
}
expressionUnit = default(ExpressionUnit);
return(false);
}
private void AddOperation(OperationExpressionUnit expressionUnit, List <IExpressionUnit> result)
{
var weight = expressionUnitChecker.GetWeight(expressionUnit.Operation);
while (stack.Count > 0 && expressionUnitChecker.GetWeight(stack.First().Operation) >= weight)
{
result.Add(stack.Pop());
}
stack.Push(expressionUnit);
}
private void ReadUnderBrackets(List <IExpressionUnit> result)
{
OperationExpressionUnit op = null;
while (stack.Count > 0 && (op = stack.Pop()).Operation != '(')
{
result.Add(op);
}
if (op != null && !op.IsOpenBracket())
{
throw new NotCorrectBracketsCountException();
}
}
private double Calck(double a, double b, OperationExpressionUnit operation)
{
switch (operation.Operation)
{
case '*': return(b * a);
case '/': return(b / a);
case '+': return(b + a);
case '-': return(b - a);
case '^': return(Math.Pow(b, a));
default: throw new NotSupportedException();
}
}
