Line continuation characters

I need to parse a grammar that includes line continuation
characters.  For example:

// COMMAND ARG1-VALUE,ARG2-VALUE, +
   ARG3-VALUE,ARG4-VALUE, +
   EVEN-MORE-ARGS
// ANOTHERCOMMAND
* and a comment
* or two

How do I formulate a rule (or rules) to treat the first command
as if all 5 arguments were specified on a single line?  I need to
skip over the /\s*+\n\s*/ sequence.  It seems like skip or resync
should do this for me, but if so, I haven't discovered the
correct technique, yet.

If one of the demo_*.pl files contains an appropriate example I'd
appreciate being pointed to it.  Thank you.

	-Marc