/// <summary>
/// Initial REPL setup and warmup
/// </summary>
private async static Task <ScriptState <object> > InitialEvaluationAsync()
{
// import required libraries
var usings = Compiler.DefaultImports.Keys
.Select(ns => $"using {ns};")
.StringJoin(" ");
var references = ScriptOptions.Default.WithReferences(Compiler.GetDefaultReferences());
var state = await CSharpScript.RunAsync(usings, references).ConfigureAwait(false);
// do a first run to "warm up" the repl so the user doesn't experience a delay for the first evaluation.
var warmup = AntlrParser.ParseAsRepl(@"(+ 30 12)")
.NormalizeWhitespace()
.ToFullString();
return(await state.ContinueWithAsync(warmup).ConfigureAwait(false));
}
public async Task RunAsync()
{
var initialState = Task.Run(InitialEvaluationAsync).ConfigureAwait(false);
DrawBanner();
ScriptState <object> state = null;
while (true)
{
//read!
Console.Write("> ");
string text = Console.ReadLine()?.Trim(); // null if ctrl-c
if (text == string.Empty)
{
continue;
}
if (text == "exit" || text == null)
{
break;
}
try
{
// eval!
// convert to roslyn tree
var program = AntlrParser.ParseAsRepl(text)
.NormalizeWhitespace()
.ToFullString();
// pass roslyn tree to scripting api
state = await(state ?? await initialState)
.ContinueWithAsync(program) // roslyn scripting api - continue program with existing instance state
.ConfigureAwait(false); // TPL api
// print!
ReplPrinter.Print(state.ReturnValue);
}
catch (Exception e)
{
Console.Error.WriteLine("Error: " + e.Message);
if (Debugger.IsAttached)
{
Console.Error.WriteLine(e.StackTrace);
}
}
} // loop!
}
