[REBOL] Re: Parsing Exercise
From: SunandaDH::aol::com at: 4-Sep-2005 3:29
Ed:
> I posted a REBOL version, but I'm not terribly gifted at writing
> parse rules. I'd be curious to see how other REBOLers might handle it.
Just saw your message this morning -- or some reason it's on the archive but
didn't make it to my inbox.
It's never clear just how much validation should be involved in an exercise
like this. Should we be handling invalid cases where the last group does not
contain a number?
If the answer to that is no, then the code can be very simple - just need to
find and increment the last string of digits. In fact, it can be simpler than
below as my code is not a pre-parse solution. But it works, and that's
usually as far as I take things.
bump-id: func [id [string!]
/local
number
number-copy
digit
digits
][
digit: charset "0123456789"
digits: [some digit]
id: head reverse id
parse/all find id digit [copy number digits]
number-copy: 1 + to-integer head reverse copy number
replace id number head reverse form number-copy
id: head reverse id
return id
]
Sunanda.
