Re: pattern match and occurence count

On 07/20/10 16:59, Suhas Chakravarty wrote:
> Hi
> I am working with FPGA's and need to extract a count of number of resources
> used from an implmentation report. A sample line from the report looks like
>
> inst "IoPort2Wrapperx/IoPort2x/IoReceiveFifoEndx/bReadOutputRecord_Data<63>"
> "SLICEM",placed CLBLM_X42Y87 SLICE_X56Y87 ,
> .
>
> I need to search for the pattern "placed CLB*" in the whole file and count
> its occurrences. But I need to make sure that repititions of CLB names (for
> example CLBLM_X42Y87) are NOT counted twice. Can I do this in Vim? Or am I
> better off writing a script for this?

I think if I understand you, you can do something like

:let matches={}
:%s/\<placed \zsCLB_\w+/\=extend(matches,
{submatch(0):submatch(0)}, 'force')[submatch(0)]/g
:echo len(matches)

This does the following:

1) create a Dict in which to store matches (Dictionaries take
care of making duplicates unique)

2) find all your matches and place them in the dict with a
little hack

3) find the number entries that were put in "matches" and do
something with it (in this case, just echo it).

If case should be ignored, you can change it to something like

extend(matches, {tolower(submatch(0)):submatch(0)},
'force')[tolower(submatch(0))]

It has the unfortunate side-effect of setting the 'modified' flag
since it's actually doing the replacement, however it replaces
the match with exactly what it found so it doesn't actually
produce real changes in the file. If you feel unsettled, you can
always just hit "u"ndo afterwards.

-tim

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