using uCalcSoftware;

var uc = new uCalc();
using (var t = new uCalc.Transformer(uc)) {
   // 1. Define state variable in the uCalc instance.
   uc.DefineVariable("indent = 0");

   // 2. Define the transformation rules.
   // Note: '{', '}', '[', ']' are escaped with quotes to be treated as literals.

   // Rule for '{' and '[': Add newline, increment indent, add indent string.
   t.FromTo("{ '{' | '[' }", "{@Self}{@nl}{@Exec: indent++}{@Eval: '  ' * indent}");

   // Rule for '}' and ']': Add newline, decrement indent, add indent string.
   t.FromTo("{ '}' | ']' }", "{@nl}{@Exec: indent--}{@Eval: '  ' * indent}{@Self}");

   // Rule for ',': Add newline and current indent string.
   t.FromTo(",", ",{@nl}{@Eval: '  ' * indent}");

   // Rule for ':': Add a space after it for readability.
   t.FromTo(":", ": ");

   // 3. Define the minified input string.
   var minifiedJson = """
{"id":123,"name":"Example","tags":["A","B"],"active":true}
""";

   // 4. Run the transformation and print the result.
   Console.WriteLine(t.Transform(minifiedJson));
}