/// <summary>
/// For explicit use from the command line. This constructor relies on a formula being supplied on the command line.
/// </summary>
/// <param name="equation"></param>
public Calculator(string userInput)
{
_isDisposed = false;
Equation equation = Equation.Parse(userInput);
string result = Calculate(equation);
Console.WriteLine("{0}", result);
}
/// <summary>
/// This gets the static instance of Calculator for use as an interactive shell.
/// </summary>
public static void Run()
{
try
{
using (Calculator calculator = new Calculator())
{
while (true)
{
Console.Write("\n> ");
string userInput = Console.ReadLine();
userInput = userInput.Trim();
userInput = userInput.Replace(" ", "");
if (!String.IsNullOrEmpty(userInput))
{
try
{
switch (userInput)
{
default:
Equation equation = Equation.Parse(userInput);
string result = Calculate(equation);
Console.WriteLine("{0}", result);
break;
case "h":
DisplayHelp();
break;
case "help":
DisplayHelp();
break;
case "?":
DisplayHelp();
break;
case "q":
throw new UserQuitException();
case "quit":
throw new UserQuitException();
}
}
catch (TokenUnrecognizedException ex0)
{
Console.WriteLine("An internal error occurred: TokenUnrecognizedException was caught. {0}", ex0.Message);
}
catch (FormatException ex0)
{
Console.WriteLine("An internal error occurred: Probably you attempted unary operations on a binary value. {0}", ex0.Message);
}
catch (InvalidOperationException ex0)
{
Console.WriteLine("An internal error occurred: Probably the stack was empty for some reason. {0}", ex0.Message);
}
}
}
}
}
catch (UserQuitException)
{
Console.WriteLine("Thanks for using PC.NET.");
}
}