[REBOL] Re: Parsing Exercise
From: tom::conlin::gmail::com at: 5-Sep-2005 15:24
ids: ["AH-1-1" "AH-1-1G" "AH-1-G1"]
digit: charset "0123456789"
else: complement digit
rule: [any else here: copy n some digit there:
(change/part :here 1 + load n :there)
]
foreach id ids[parse find/last id "-" rule]
print ids
; ids are in a block of strings
; incremented part is after last hyphen
; incremented natural numbers never get shorter
On 9/1/05, Ed O'Connor <[edoconnor--gmail--com]> wrote:
>
> This string processing exercise is taken from the post:
>
> http://discuss.joelonsoftware.com/default.asp?design.4.195596.22
>
> Begin //////////////////////////
>
> Given a text number of the follwing format:
>
> AH-1-1
> Or
> AH-1-1G
> Or
> AH-1-G1
>
> During data entry, we want the number code of the last part (token) to
> increment by one.
>
> So, if you pass the above values, you get
>
> AH-1-1 --> AH-1-2 --> AH-1-3
> AH-1-1G --> AH-1-2G --> AH-1-3G
> AH-1-G1 --> AH-1-G2 --> AH-1-G3
>
> ////////////// End
>
> 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.
>
> Of course, if you have an approach that is elegant and/or terse, reply
> to the orginal poster.
>
> Regards,
> Ed
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