[antlr-interest] Forcing action into DFA

[Patrick Hulsmeijer]

All,

 

Is there a way to force an action into the prediction DFA although the
alternatives are not ambiguous? An semantic predicate wouldn't work
because it will not be hoisted into the DFA. I want to execute an action
before the alternatives of a rule get evaluated.

 

E.g.:

 

rule:

                : TOKEN

                | HIDDENTOKEN

                ;

 

The HIDDENTOKEN is on a channel that is not visible to the parser but
will be switched to a channel that is, by an action. To make this work
with DFA prediction I need to execute the action that will make
HIDDENTOKEN visible before the alternatives are looked at. How can I
make this happen?

 

Gr, patrick.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.antlr.org/pipermail/antlr-interest/attachments/20080418/a0aa4732/attachment.html