A practical example that transpiles a multi-line legacy script, including comments, variables, and a conditional statement with a nested action.

ID: 1377

See: Project: Transpiling Legacy Code to Modern 
				
					using uCalcSoftware;

var uc = new uCalc();
var t = uc.NewTransformer();
// Rules must be defined in an order that allows for proper transformation.

// 1. Comment rule
t.FromTo("REM {comment}", "// {comment}");

// 2. Variable assignment rule
t.FromTo("LET {@Alpha:var} = {val}", "var {var} = {val};");

// 3. Print statement rule
t.FromTo("PRINT {output}", "console.log({output});");

// 4. IF...THEN rule with RewindOnChange to handle nested statements
var ifRule = t.FromTo("IF {condition} THEN {action}", """
if ({condition}) {
  {action}
}
""");
ifRule.RewindOnChange = true;

// The legacy script to transpile
var legacyScript = """
REM Initialize variables
LET X = 10
LET Y = X * 2
IF Y > 15 THEN PRINT "Value is large"
""";

// Run the transformation
Console.WriteLine(t.Transform(legacyScript));
				
			
// Initialize variables
var X = 10;
var Y = X * 2;
if (Y > 15) {
  console.log("Value is large");
}
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					#include <iostream>
#include "uCalc.h"

using namespace std;
using namespace uCalcSoftware;

int main() {
   uCalc uc;
   auto t = uc.NewTransformer();
   // Rules must be defined in an order that allows for proper transformation.

   // 1. Comment rule
   t.FromTo("REM {comment}", "// {comment}");

   // 2. Variable assignment rule
   t.FromTo("LET {@Alpha:var} = {val}", "var {var} = {val};");

   // 3. Print statement rule
   t.FromTo("PRINT {output}", "console.log({output});");

   // 4. IF...THEN rule with RewindOnChange to handle nested statements
   auto ifRule = t.FromTo("IF {condition} THEN {action}", R"(if ({condition}) {
  {action}
})");
   ifRule.RewindOnChange(true);

   // The legacy script to transpile
   auto legacyScript = R"(REM Initialize variables
LET X = 10
LET Y = X * 2
IF Y > 15 THEN PRINT "Value is large")";

   // Run the transformation
   cout << t.Transform(legacyScript) << endl;
}
				
			
// Initialize variables
var X = 10;
var Y = X * 2;
if (Y > 15) {
  console.log("Value is large");
}
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					Imports System
Imports uCalcSoftware
Public Module Program
   Public Sub Main()
      Dim uc As New uCalc()
      Dim t = uc.NewTransformer()
      '// Rules must be defined in an order that allows for proper transformation.
      
      '// 1. Comment rule
      t.FromTo("REM {comment}", "// {comment}")
      
      '// 2. Variable assignment rule
      t.FromTo("LET {@Alpha:var} = {val}", "var {var} = {val};")
      
      '// 3. Print statement rule
      t.FromTo("PRINT {output}", "console.log({output});")
      
      '// 4. IF...THEN rule with RewindOnChange to handle nested statements
      Dim ifRule = t.FromTo("IF {condition} THEN {action}", "if ({condition}) {
  {action}
}")
      ifRule.RewindOnChange = true
      
      '// The legacy script to transpile
      Dim legacyScript = "REM Initialize variables
LET X = 10
LET Y = X * 2
IF Y > 15 THEN PRINT ""Value is large"""
      
      '// Run the transformation
      Console.WriteLine(t.Transform(legacyScript))
   End Sub
End Module
				
			
// Initialize variables
var X = 10;
var Y = X * 2;
if (Y > 15) {
  console.log("Value is large");
}
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