using uCalcSoftware;

var uc = new uCalc();
var t = uc.ExpressionTransformer;

// Base case: a single argument
t.FromTo("AddUp({x})", "{x}");

// Recursive case: multiple arguments
// RewindOnChange(true) causes the transformer to re-scan the string after a replacement.
// This allows AddUp(1,2,3) -> (1 + AddUp(2,3)) -> (1 + (2 + AddUp(3))) -> (1 + (2 + 3))
t.FromTo("AddUp({x}, {y})", "({x} + AddUp({y}))").RewindOnChange = true;

Console.WriteLine("Input: AddUp(1, 2, 3, 4)");
Console.WriteLine($"Result: {uc.Eval("AddUp(1, 2, 3, 4)")}");