private static void TestAstPrinter()
{
// -123 * (45.67) => (* (- 123) (group 45.67))
Expr expression =
new Expr.Binary(
new Expr.Unary(
new Token(TokenType.MINUS, "-", null, 1),
new Expr.Literal(123)
),
new Token(TokenType.STAR, "*", null, 1),
new Expr.Grouping(
new Expr.Literal(45.67)
)
);
var printer = new AstPrinter();
Console.WriteLine(expression.Accept(printer));
Console.ReadLine();
}
public string VisitBinaryExpr(Expr.Binary expr)
{
return(Parenthesise(expr.Opr.Lexeme, expr.Left, expr.Right));
}
public Nothing VisitBinaryExpr(Expr.Binary expr)
{
Resolve(expr.Left);
Resolve(expr.Right);
return(Nothing.AtAll);
}
