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numeric representation too big for Integer. [message #1300376]

Thu, 17 April 2014 10:26

Eclipse User

Hi,

I need to process a numeric string which is too big to fit in an int.
A value which fails:

4294967295

This is actually the exact max size of an unsigned int, but java int is
32bit signed, so this won't fit. So I guess I need a unsigned int here.

I tried changing the return type to EBigDecimal and EBigInteger but I
still get errors/markers in the editor.

terminal INT returns ecore::EInt:
'-'? ('0'..'9')+;

Do I need to implement an IValueConverter or is there a way to handle
this in the grammar directly.?

Thank You,
Christophe

Re: numeric representation too big for Integer. [message #1300401 is a reply to message #1300376]

Thu, 17 April 2014 10:49

Eclipse User

Hi,

yes you have to

BIG_INT returns ecore::EBigInteger:
	INT
;

public class MyDslConverters extends DefaultTerminalConverters {
	
	@Inject
	private BigIntegerValueConverter bigIntegerValueConverter;
	
	@ValueConverter(rule = "BIG_INT")
	public IValueConverter<BigInteger> BIG_INT() {
		return bigIntegerValueConverter;
	}
	
	private static class BigIntegerValueConverter extends AbstractLexerBasedConverter<BigInteger> {

		@Override
		public BigInteger toValue(String string, INode node)
				throws ValueConverterException {
			try {				
				return new BigInteger(string);
			} catch (NumberFormatException e) {
				throw new ValueConverterException("Kein BigInteger", node, e);
			}
		}
		
	}

}

Re: numeric representation too big for Integer. [message #1300402 is a reply to message #1300376]

Thu, 17 April 2014 10:49

Eclipse User

Hi

INT is bound to the IntValueConverter that uses Integer.parseInt, but it
is injectable so you might manage to replace it. However you're liable
to find other places whether the special behavior of INT is assumed so
much better to introduce a new terminal.

Regards

Ed Willink

On 17/04/2014 15:26, Christophe Bouhier wrote:
> Hi,
>
> I need to process a numeric string which is too big to fit in an int.
> A value which fails:
>
> 4294967295
>
> This is actually the exact max size of an unsigned int, but java int
> is 32bit signed, so this won't fit. So I guess I need a unsigned int
> here.
>
> I tried changing the return type to EBigDecimal and EBigInteger but I
> still get errors/markers in the editor.
>
> terminal INT returns ecore::EInt:
> '-'? ('0'..'9')+;
>
> Do I need to implement an IValueConverter or is there a way to handle
> this in the grammar directly.?
>
> Thank You,
> Christophe

Re: numeric representation too big for Integer. [message #1300737 is a reply to message #1300401]

Thu, 17 April 2014 15:46

Eclipse User

On 17-04-14 16:49, Christian Dietrich wrote:
> Hi,
>
> yes you have to
>
> BIG_INT returns ecore::EBigInteger:
> INT
> ;

Thanks!

>
> public class MyDslConverters extends DefaultTerminalConverters {
>
> @Inject
> private BigIntegerValueConverter bigIntegerValueConverter;
>
> @ValueConverter(rule = "BIG_INT")
> public IValueConverter<BigInteger> BIG_INT() {
> return bigIntegerValueConverter;
> }
>
> private static class BigIntegerValueConverter extends
> AbstractLexerBasedConverter<BigInteger> {
>
> @Override
> public BigInteger toValue(String string, INode node)
> throws ValueConverterException {
> try {
> return new BigInteger(string);
> } catch (NumberFormatException e) {
> throw new ValueConverterException("Kein BigInteger",
> node, e);
> }
> }
>
> }
>
> }
>

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