[antlr-interest] Rewind one token?

[Ingo Maier]

On Mon, 2004-08-16 at 11:40, Monty Zukowski wrote:
> Giving different rules a try is exactly what syntactic predicates are 
> for.  Perhaps if you could post a small example that shows the problem 
> we can help out.
> 
> Monty

I want to merge two parsers with each having its own lexer. Let's take
OCL and Java as an example. The following input:

context: Foo
inv: 42==42

class Foo {}

Give OCL a try, it parses til (including) "class" because a boolean
operator and additional expressions may follow 42==42. But at "class"
the OCL parser fails. Now, I want to start the Java parser. However, it
needs the "class" token. Not as a token, but as a character sequence
because the Java lexer may produce a different token out of it.

So I assume this has to be done on the character level. Does ANTLR
supports me with my problem in any way?

Thanks,
Ingo



 
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