public void Visit(IntLiteralNode node)
{
Debug.Write(" " + node.Value + " ");
}
private Node LeafExpression()
{
Node result;
switch (lex.Token)
{
case Token.Identifier:
{
string identifier = lex.Lexeme;
lex.Next(false);
result = IdentifierRest(identifier, false);
break;
}
case Token.IntLiteral:
{
int value = int.Parse(lex.Lexeme);
lex.Next(false);
result = new IntLiteralNode { Value = value };
break;
}
case Token.FloatLiteral:
{
double value = double.Parse(lex.Lexeme);
lex.Next(false);
result = new FloatLiteralNode { Value = value };
break;
}
case Token.CharLiteral:
{
char value = char.Parse(lex.Lexeme);
lex.Next(false);
result = new CharLiteralNode { Value = value };
break;
}
case Token.StringLiteral:
{
string value = lex.Lexeme;
lex.Next(false);
result = new StringLiteralNode { Value = value };
break;
}
case Token.OpenParentheses:
lex.Next();
result = Expression();
if (lex.Token != Token.ClosedParentheses)
{
throw CreateErrorExpectedToken(Token.ClosedParentheses);
}
lex.Next();
break;
default:
throw CreateErrorUnexpectedToken(lex.Token, lex.Lexeme);
}
return result;
}
public void Visit(IntLiteralNode node)
{
Debug.WriteLine("Visiting " + node.GetType().Name);
}
public void Visit(IntLiteralNode node)
{
valueStack.Push(node.Value);
}