public Node Statement()
{
Node node = null;
TokenType type = CurrentToken().type;
if (IsAssignment())
{
node = Assignment();
}
else if (IsArrayAccess())
{
node = ArrayUpdate();
}
else if (IsWhile())
{
node = While();
}
else if (IsFor())
{
node = For();
}
else if (IsIfElse())
{
node = If();
}
else if (IsFunctionDef())
{
node = FunctionDefinition();
}
else if (IsFunctionCall())
{
node = FunctionCall();
}
else if (type == TokenType.PRINT)
{
MatchAndEat(TokenType.PRINT);
node = new PrintNode(Expression(), "sameline");
}
else if (type == TokenType.PRINTLN)
{
MatchAndEat(TokenType.PRINTLN);
node = new PrintNode(Expression(), "newline");
}
else if (type == TokenType.WAIT)
{
MatchAndEat(TokenType.WAIT);
node = new WaitNode(Expression());
}
else
{
Console.WriteLine("Unknown language construct: "
+ CurrentToken().text);
Environment.Exit(0);
}
return(node);
}
public static void main(string[] args)
{
Node firstMsg = new PrintNode(new NumberNode(1), "newline");
Node secondMsg = new PrintNode(new NumberNode(2), "newline");
Node wait = new WaitNode(new NumberNode(2000));
List <Node> script = new List <Node>();
script.Add(firstMsg);
script.Add(wait);
script.Add(secondMsg);
foreach (Node statement in script)
{
statement.Eval();
}
}
