Hmmm... that's evil, ya know that ;) Good to catch that now, though...
Probably LITERAL_1, LITERAL_2, etc. To make it easier for
debugging/printing/reporting you could add a pattern property (hmmm...
the more I think about it the more I like it... if there's a
description it could be printed w/ the error message, otherwise the
pattern. both could be useful for other purposes)
public enum FooParserTokens implements TokenType {
IDENT("('a'..'z')('a'..'z'|'A'..'Z')*", "an identifier ..."),
LITERAL_1(";", null),
LITERAL_2("+", null);
private String pattern;
private String description;
private FooParserTokens(String pattern, String description) {
this.pattern = pattern;
this.description = description;
}
}
-- Scott
----------------------------------------
Scott Stanchfield
http://javadude.com
On Wed, May 19, 2010 at 2:42 PM, Terence Parr <pa...@cs.usfca.edu> wrote:
>
> On May 19, 2010, at 11:39 AM, Scott Stanchfield wrote:
>
>> You can still define the match in the superclass -- just use an
>> interface like Edgar mentioned and I demonstrated in the
>> "clarification" note I sent.
>
> oh right.
>
>> I think the big value here would be that it forces every place that
>> uses the token types to use the enum names (as there are no integer
>> values). I think that would help debugging enormously (rather than
>> seeing '4' as the value in the variables window, you'd see 'IDENT').
>
> what about ';' token? What's it's label?
> T
>
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