Can you create a built-in script interpreter or executor in a Delphi application that incorporates the functions that I provide for the user?

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Yes, it is possible to create a built-in script interpreter or executor in a Delphi application that incorporates user-provided functions. Delphi has several third-party components available that can help implement script interpreters or executors, such as PascalScript, DelphiWebScript, and RemObjects Script.

To incorporate user-provided functions, you could define an API or interface that exposes the functions to the script interpreter. This API or interface would define the function signatures and any necessary parameters or return values. You would then register these functions with the script interpreter or executor so that they become available for use by the script.

For example, using PascalScript, you could create a TPSExec component and register your user-defined functions using the component's RegisterFunction method. Your script code could then call these functions using the standard function syntax.

Here is an example of how you could define and register a user-defined function:

type
  TMyFunctions = class
  public
    class function Add(a, b: Integer): Integer; static;
  end;

class function TMyFunctions.Add(a, b: Integer): Integer;
begin
  Result := a + b;
end;

var
  Exec: TPSExec;
begin
  Exec := TPSExec.Create;
  try
    // Register the Add function
    Exec.RegisterFunction(@TMyFunctions.Add, 'function Add(a, b: Integer): Integer;');

    // Compile and execute the script
    Exec.Script.Text := 'var result := Add(2, 3);';
    Exec.Run;

    // Retrieve the result
    ShowMessage(IntToStr(Exec.GetVar('result', TypeInfo(Integer))));
  finally
    Exec.Free;
  end;
end;

In this example, we define a TMyFunctions class that contains a static Add function that takes two integers and returns their sum. We then register this function with the script interpreter using the TPSExec component's RegisterFunction method.

We then compile and execute a simple script that calls the Add function with the arguments 2 and 3, and stores the result in a variable called "result". We retrieve this result using the TPSExec component's GetVar method and display it in a message box.

Note that this is just a simple example, and there are many variations and customizations you can make depending on your specific needs and requirements.