public Cases Cases()
{
try
{
if (this.currentToken.Tipo == Lexico.TipoToken.TK_CASE)
{
Cases cas = new Cases();
this.currentToken = lex.NextToken();
if (this.currentToken.Tipo != Lexico.TipoToken.TK_CHAR_LIT && this.currentToken.Tipo != Lexico.TipoToken.TK_FLOAT_LIT && this.currentToken.Tipo != Lexico.TipoToken.TK_INT_LIT)
throw new Exception("Se esperaba un numero o un char");
cas.Valor = Expression();
this.currentToken = lex.NextToken();
if (this.currentToken.Tipo != Lexico.TipoToken.TK_DOSPUNTOS)
throw new Exception("Se esperaba el simbolo :");
currentToken = lex.NextToken();
cas.S = StatementList();
cas.sig = Cases();
return cas;
}
return null;
}
catch (Exception ex)
{
throw ex;
}
}
Cases parseCase()
{
if (currentToken.Tipo != TipoToken.TK_INT_LIT)
throw new Exception("Se esperaba una constante numérica.");
else
{
Cases ret = new Cases();
ret.Valor = new LiteralEntero(int.Parse(currentToken.Lexema));
currentToken = lex.NextToken();
if (currentToken.Tipo != TipoToken.TK_DOSPUNTOS)
throw new Exception("se esperaba :");
else
{
currentToken = lex.NextToken();
try { ret.S = CodeBlock(); }
catch (Exception ex) { throw ex; }
return ret;
}
}
}
public Cases Cases()
{
if (currentToken.Tipo == Lexico.TipoToken.TK_CASE)
{
currentToken = lex.NextToken();
Cases C = new Cases();
if (currentToken.Tipo != Lexico.TipoToken.TK_CHAR_LIT ||
currentToken.Tipo != Lexico.TipoToken.TK_FLOAT_LIT ||
currentToken.Tipo != Lexico.TipoToken.TK_INT_LIT)
{
try
{
C.Valor = Expr();
}
catch (Exception ex)
{
throw ex;
}
//currentToken = lex.NextToken();
if (currentToken.Tipo == TipoToken.TK_DOSPUNTOS)
{
currentToken = lex.NextToken();
try
{
C.S = StatementList();
C.Sig = Cases();
}
catch (Exception ex)
{
throw ex;
}
return C;
}
else
{
throw new Exception("Error Sintactico - Se esperaba el simbolo :");
}
}
else
{
throw new Exception("Error Sintactico - Se esperaba un numero o un char");
}
}
else
{
return null;
}
}