Using ExpressionTransformer to transform expressions before they are parsed

ID: 73

See: ExpressionTransformer = [Transformer], FromTo, RewindOnChange = [bool], RewindOnChange(bool) 
				
					using uCalcSoftware;

var uc = new uCalc();
var ExprT = uc.ExpressionTransformer;  // Transformer used for Eval() and Evaluate()

var p1 = ExprT.FromTo("AddUp({x})", "{x}"); // RewindOnChange False by default
var p2 = ExprT.FromTo("AddUp({x}, {y})", "({x} + AddUp({y}))").SetRewindOnChange(true);

Console.WriteLine($"p1 RewindOnChange: {p1.RewindOnChange}");
Console.WriteLine($"p2 RewindOnChange: {p2.RewindOnChange}");

Console.WriteLine("");

Console.WriteLine($"Input: AddUp(1,2,3,4)");
Console.WriteLine($"Transform: {ExprT.Transform("AddUp(1,2,3,4)")}");
Console.WriteLine($"Eval: {uc.Eval("AddUp(1,2,3,4)")}");
				
			
p1 RewindOnChange: False
p2 RewindOnChange: True

Input: AddUp(1,2,3,4)
Transform: (1 + (2 + (3 + 4)))
Eval: 10
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					#include <iostream>
#include "uCalc.h"

using namespace std;
using namespace uCalcSoftware;

#define tf(IsTrue) ((IsTrue) ? "True" : "False")

int main() {
   uCalc uc;
   auto ExprT = uc.ExpressionTransformer();  // Transformer used for Eval() and Evaluate()

   auto p1 = ExprT.FromTo("AddUp({x})", "{x}"); // RewindOnChange False by default
   auto p2 = ExprT.FromTo("AddUp({x}, {y})", "({x} + AddUp({y}))").SetRewindOnChange(true);

   cout << "p1 RewindOnChange: " << tf(p1.RewindOnChange()) << endl;
   cout << "p2 RewindOnChange: " << tf(p2.RewindOnChange()) << endl;

   cout << "" << endl;

   cout << "Input: " << "AddUp(1,2,3,4)" << endl;
   cout << "Transform: " << ExprT.Transform("AddUp(1,2,3,4)") << endl;
   cout << "Eval: " << uc.Eval("AddUp(1,2,3,4)") << endl;
}
				
			
p1 RewindOnChange: False
p2 RewindOnChange: True

Input: AddUp(1,2,3,4)
Transform: (1 + (2 + (3 + 4)))
Eval: 10
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					Imports System
Imports uCalcSoftware
Public Module Program
   Public Sub Main()
      Dim uc As New uCalc()
      Dim ExprT = uc.ExpressionTransformer  '// Transformer used for Eval() and Evaluate()
      
      Dim p1 = ExprT.FromTo("AddUp({x})", "{x}") '// RewindOnChange False by default
      Dim p2 = ExprT.FromTo("AddUp({x}, {y})", "({x} + AddUp({y}))").SetRewindOnChange(true)
      
      Console.WriteLine($"p1 RewindOnChange: {p1.RewindOnChange}")
      Console.WriteLine($"p2 RewindOnChange: {p2.RewindOnChange}")
      
      Console.WriteLine("")
      
      Console.WriteLine($"Input: AddUp(1,2,3,4)")
      Console.WriteLine($"Transform: {ExprT.Transform("AddUp(1,2,3,4)")}")
      Console.WriteLine($"Eval: {uc.Eval("AddUp(1,2,3,4)")}")
   End Sub
End Module
				
			
p1 RewindOnChange: False
p2 RewindOnChange: True

Input: AddUp(1,2,3,4)
Transform: (1 + (2 + (3 + 4)))
Eval: 10
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