/// <summary>
/// EBNF ファイルをパース.
/// </summary>
/// <param name="text">JSON ファイル.</param>
/// <returns>JSON オブジェクト.</returns>
public static GeneratedParser Parse(string text)
{
// トークンに分解する
TokenList <TokenType> tokens = Tokenize(text);
// パース
EBNFContext context = new EBNFContext(tokens.GetEnumerator());
EBNFExpression exp = new EBNFExpression();
exp.Interpret(context);
// 生成されたパーサを返す
GeneratedParser parser = new GeneratedParser(
context.Tokenizer,
context.Fields,
context.Root
);
return(parser);
}
public static void Main()
{
var done = true;
Command last = null;
while (done)
{
Console.Write(":");
var currentCommand = Console.ReadLine()?.Trim();
switch (currentCommand)
{
case "exit":
case "q":
case "q!":
{
done = false;
break;
}
case "help":
{
last = new Command(null, list => PrintHelp());
last.Execute();
break;
}
case "last":
{
last?.Execute();
break;
}
case "clear":
{
last = new Command(null, list => Console.Clear());
last.Execute();
break;
}
case "calc":
{
Console.Write("Type expression: ");
var expr = Console.ReadLine();
last = new Command(new List <string> {
expr
}, list =>
{
var lexer = new GeneratedLexer(list[0]);
var parser = new GeneratedParser(lexer);
var res = parser.e();
Console.WriteLine(res.res);
});
last.Execute();
break;
}
default:
{
last = new Command(null, list => Console.WriteLine("Command not recognized, type help to list available commands"));
last.Execute();
break;
}
}
}
}
