public ExposableParseTreeNode Parse(string input)
{
_Scanner = new Scanner(input);
ExposableParseTreeNode answer = Expression();
if (answer == null)
throw new ExpectedTokenParseException(ExpectedWhat, ButGotToken);
if (!Scanner.AtEnd)
throw new UnexpectedTokenParseException(Scanner.Next());
return answer;
}
public ExposableParseTreeNode Parse(string input)
{
_Scanner = new Scanner(input);
ExposableParseTreeNode answer = ExpressionChain();
if (answer == null)
throw new ExpectedTokenParseException(LocationFromToken(ButGotToken), ExpectedWhat, ButGotToken);
if (!Scanner.AtEnd)
{
Token x = Scanner.Next();
throw new UnexpectedTokenParseException(LocationFromToken(x), x);
}
return answer;
}
void Lex()
{
listBoxTokens.Items.Clear();
Scanner scanner = new Scanner(textBoxInput.Text);
Token token;
while (true)
{
token = scanner.Next();
if (token.Type == TokenType.TokenEndOfInput)
break;
string s = token.Type.ToString();
if (token.Value != null)
s += "(" + token.Value + ")";
listBoxTokens.Items.Add(s);
}
}