public static Equation[] ParseInput(string[] args)
{
Equation leftSide = new Equation();
var currentSide = new Equation();
var equals = false;
var brackets = false; // check if brackets is open
var bracketEquation = new Equation();
var bracketModifier = "1";
var bracketOperator = '*';
for (int i = 0; i < args.Length; i++)
{
if (equals)
{
leftSide = currentSide;
currentSide = new Equation(); // switches side of the equation (current side is now right side)
equals = false; // will no longer switch on loop
}
bool wasNumber = false; // check if argument is a number
foreach (var c in args[i])
{
if (c == '=')
{
equals = true;
}
else if (IsNumber(c) && !wasNumber)
{
wasNumber = true;
}
else if (IsOperator(c) && args[i].Length == 1)
{
// is a single operator and not a modifier operator ( - as opposed to -4X )
wasNumber = false;
var operation = c;
//Check to see if multiple operators existing concurrently
if (i < args.Length - 1 && args[i + 1].Length == 1 && IsUnaryOperator(args[i][0]) && IsUnaryOperator(args[i + 1][0]))
{
operation = args[i][0] == args[i + 1][0] ? '+' : '-';
i++;
if (i + 1 < args.Length - 1 && args[i + 1].Length == 1 && IsUnaryOperator(args[i + 1][0]))
{
operation = operation == args[i + 1][0] ? '+' : '-';
i++;
}
}
if (brackets)
{
bracketEquation.Add(operation);
}
else
{
currentSide.Add(operation);
}
}
else if (c == '(')
{
wasNumber = false;
brackets = true;
bracketEquation = new Equation(); //renew variable incase of multiple brackets
}
else if (c == ')') // close bracket
{
if (i + 1 < args.Length && IsMultiDivide(args[i + 1][0]))
{
bracketModifier = args[i + 2];
bracketOperator = args[i + 1][0];
i += 2; // skip the next two arguments as you add them to the bracket
}
wasNumber = false;
brackets = false;
currentSide.Add(bracketEquation, bracketModifier, bracketOperator);
}
}
if (wasNumber)
{
if (brackets)
{
bracketEquation.Add(args[i]);
}
else if (i < args.Length - 1 && args[i + 1][0] == '(') // next character is an open bracket
{
bracketModifier = args[i];
}
else
{
currentSide.Add(args[i]);
}
}
}
return(new [] { leftSide, currentSide });
}
// Calculator Constructor - Create a new equation object by passing in an array of arguments
public Calculator(string[] args)
{
equation = new Equation(args);
}
// Merge two equations together
public void Merge(Equation equation)
{
_a -= equation._a;
_b -= equation._b;
}
