private static void EvaluateFunction(Function function, String expression)
{
try {
Expression expr = new Expression( expression, Factory );
BigNum num = expr.Evaluate( _symbols );
BigNum result = EvaluateFunction(function, num);
Console.WriteLine("Result: " + result.ToString() );
} catch(Exception ex) {
PrintException(ex);
}
}
private static Boolean PromptUser()
{
Console.Write( (++_count).ToString() );
Console.Write(">");
String s = Console.ReadLine();
if( s == "q" ) return false;
if( s.StartsWith("add ", StringComparison.OrdinalIgnoreCase) ) {
String name = s.Substring(4, s.IndexOf('=') - 5 ).Trim();
String expr = s.Substring( s.IndexOf('=') + 1 ).Trim();
try {
Expression xp = new Expression( expr, Factory );
BigNum ret = xp.Evaluate( _symbols );
if( _symbols.ContainsKey( name ) ) _symbols[name] = ret;
else _symbols.Add( name, ret );
Console.WriteLine("Added: " + name + " = " + ret.ToString() );
} catch(Exception ex) {
PrintException(ex);
}
} else if( s.StartsWith("rem ", StringComparison.OrdinalIgnoreCase) ) {
String name = s.Substring(4);
_symbols.Remove( name );
Console.WriteLine("Removed: " + name);
} else if( String.Equals(s, "help", StringComparison.OrdinalIgnoreCase) ) {
PrintHelp();
} else if( String.Equals(s, "test", StringComparison.OrdinalIgnoreCase) ) {
// BigNumTests.Test();
} else {
Int32 startIndex;
Function func = IsFunction( s, out startIndex );
if( func != Function.None ) {
EvaluateFunction( func, s.Substring( startIndex ) );
} else {
EvaluateExpression( s );
}
}
return true;
}
public UserFunction(String name, String expression, params String[] parameterNames)
{
Name = name;
FunctionType = FunctionType.User;
ParameterNames = new ReadOnlyCollection<String>(parameterNames);
_expr = new Expression( expression, null );
}