public static void Main(string[] args)
{
Console.Clear();
while (true) //handle switching prompts
{
Prompt(Constants.ReplPromptName, x => { REPLCommandInterpreter.Execute(x); }, _cmdBuffer);
Prompt(LanguageName, x => {
if (_languageInterp != null)
{
var results = _languageInterp(x);
if (results.Item1.Count > 0)
{
BetterConsole.WriteOnNextLine($"Result: ({string.Join(", ", results.Item1)})", ConsoleColor.Green);
}
if (results.Item2.Count > 0)
{
BetterConsole.WriteOnNextLine($"Errors: \n{string.Join("\n\n", results.Item2.Select(y => TreePrinter.ToString(y, z => z.SubErrors)))}", ConsoleColor.Red);
}
}
else
{
BetterConsole.WriteOnNextLine("Language not loaded. Use REPL Command {Language} to load a language assembly.");
}
}, _langBuffer);
}
}
protected override void ExecuteCmd(List <string> args)
{
if (_languagedLoaded)
{
BetterConsole.WriteOnNextLine("Language already loaded, unloading languages is not currently supported.");
return;
}
if (!File.Exists(args[0]))
{
BetterConsole.WriteOnNextLine($"No file named {args[0]}");
return;
}
try {
var assem = Assembly.LoadFile(args[0]);
var handlers = assem.GetTypes().Where(x => x.GetInterfaces().Contains(typeof(ISymbolHandler))).Select(x => (ISymbolHandler)Activator.CreateInstance(x)).ToArray();
var languageInfo = (ILanguageInfo)Activator.CreateInstance(assem.GetTypes().First(x => x.GetInterfaces().Contains(typeof(ILanguageInfo))));
Program.LanguageName = languageInfo.Name;
var results = LoadLanguageInterpreter.MakeTemporaryParser(languageInfo.Grammar);
if (results.Item2.Count > 0)
{
BetterConsole.WriteOnNextLine($"Failure to load language: {string.Join("\n\n", results.Item2.Select(y => TreePrinter.ToString(y, z => z.SubErrors)))}", ConsoleColor.Red);
return;
}
Program._languageInterp = code => results.Item1(code, handlers);
_languagedLoaded = true;
BetterConsole.WriteOnNextLine($"{languageInfo.Name} loaded.");
} catch (Exception ex) {
BetterConsole.WriteOnNextLine($"{args[0]} is not a path to a valid language assembly.");
}
}
public virtual void Help()
{
BetterConsole.WriteOnNextLine(CommandInfo);
if (!string.IsNullOrEmpty(Usage))
{
BetterConsole.WriteOnNextLine(Usage);
}
}
public void Call(List <string> args)
{
if (args.Count < RequiredArgNum)
{
if (!string.IsNullOrEmpty(Usage))
{
BetterConsole.WriteOnNextLine(Usage);
}
}
else
{
ExecuteCmd(args);
}
}
public static List <object> CallREPLCommand(List <object> args)
{
var strArgs = args.Select(x => (string)x).Where(x => !string.IsNullOrWhiteSpace(x)).Select(x => x.Trim('"')).ToList();
var maybeCmd = _replCommands.TryGetValue(strArgs[0].ToLower());
if (maybeCmd.IsNone)
{
BetterConsole.WriteOnNextLine(Constants.UnknownCmdFmtStr, strArgs[0]);
}
else
{
maybeCmd.Value.Call(strArgs.Skip(1).ToList());
}
return(new List <object>());
}
protected override void ExecuteCmd(List <string> args)
{
if (args.Count == 0)
{
Help();
}
else
{
var maybeCmd = _commands.TryGetValue((args[0]).ToLower());
if (maybeCmd.IsNone)
{
BetterConsole.WriteOnNextLine(Constants.UnknownCmdFmtStr, args[0]);
}
else
{
maybeCmd.Value.Help();
}
}
}
private static void Prompt(string promptText, Action <string> handler, List <string> buffer)
{
var done = false;
while (!done)
{
BetterConsole.Prompt(
$"{promptText}>",
buffer,
BetterConsole.MakeKeyHandler(ConsoleKey.Escape, v => done = true),
BetterConsole.MakeKeyHandler(ConsoleKey.Enter, v => {
if (!string.IsNullOrEmpty(v))
{
buffer.Remove(v);
buffer.Add(v);
handler(v);
}
BetterConsole.WriteLine();
return(true);
})
);
}
}
protected override void ExecuteCmd(List <string> args)
{
BetterConsole.WriteOnNextLine($"Available commands: {string.Join(", ", _commands.Values.Select(x => x.Name).ToArray())}");
}