Dear all the runnable example code is as blow =================================================================== import Conduit import Text.Regex (matchRegex,mkRegex,Regex) loghead = mkRegex "^([0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2},[0-9]{3} )" -- "2015-01-25 00:04:18,840" logMerge::Regex->String->String->(String,[String]) logMerge logregex str accum = case matchRegex logregex str of Just _ -> (str,[(accum++"\n")]) Nothing -> case null accum of True -> (str,[]) False -> (accum ++ "<br>" ++ str,[]) runMerge::String->String->IO () runMerge infile outfile = runResourceT $ sourceFile infile $= linesUnboundedC $= concatMapAccumC (logMerge loghead ) "" $$ sinkFile outfile ================================================================ the example input file is --------- 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | | errorCode: toString() = null 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | codsexception.getErrorCode(): toString() { errorCode = "UNEXPECTED_PROBLEM" severity = "" } 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | | 2015-01-25 00:03:45,331 | DEBUG | WebContainer : 20 | | --------- the expected output is --------- 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | | errorCode: toString() = null 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | codsexception.getErrorCode(): toString() <br>{<br> errorCode =<br>"UNEXPECTED_PROBLEM"<br> severity = ""<br>} 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | | 2015-01-25 00:03:45,331 | DEBUG | WebContainer : 20 | | --------- the actual output is blow, missing the last line of log --------- 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | | errorCode: toString() = null 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | codsexception.getErrorCode(): toString() <br>{<br> errorCode =<br>"UNEXPECTED_PROBLEM"<br> severity = ""<br>} 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | | --------- Thanks

在 2017年7月19日，下午7:50，Michael Snoyman mailto:michael@snoyman.com> 写道：

I'm afraid I doon't follow what it meant by the stream here. Could you provide a complete, runnable example and indicate what the expected and actual output are?

On Mon, Jul 17, 2017 at 5:48 AM, jun zhang mailto:zhangjun.julian@gmail.com> wrote: Dear cafes

I use Conduit to parse a huge file. And I need merge lines by condition.

I find the concatMapAccumC can do that and I write a demo as blow(with conduit-combinators-1.0.6,lts-6.18). The problem is if the last item didn’t make condition true, the data only keep in the accum but missing in stream.

Any one can give me some advises?

Thanks

---------------------------- import Conduit

test'::Int->Int->(Int,[Int]) test' a s = case (a+s) > 5 of True -> (0,[a+s]) False -> (a+s,[])

testlog::IO [Int] testlog = runConduit $ (yieldMany [1,2,3,4,5,6,3]) $= (concatMapAccumC test' 0 ) $$ sinkList

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Thanks very much

在 2017年7月21日，下午3:17，Michael Snoyman 写道：

I'll preface by saying this probably indicates that the API for concatMapAccumC should be slightly different than it is currently.

The problem is that there is no way to convert the final accumulator value into output, and therefore when the input stream ends, that accumulator is simply dropped. One solution (pretty hacky) is to wrap all of the lines in a `Just` and then send in a final `Nothing` value to indicate that the stream is ended. This would look like:

https://gist.github.com/snoyberg/6537120fca2e9b8944e41fe60d285793 https://gist.github.com/snoyberg/6537120fca2e9b8944e41fe60d285793

Another option is to simply use the conduit primitives (await and yield) directly:

https://gist.github.com/snoyberg/bd58030db9b9c90f9e1fcf8b31ea10e9 https://gist.github.com/snoyberg/bd58030db9b9c90f9e1fcf8b31ea10e9

I'd lean towards the latter.

On Thu, Jul 20, 2017 at 9:34 AM, jun zhang mailto:zhangjun.julian@gmail.com> wrote: Dear all

the runnable example code is as blow

=================================================================== import Conduit import Text.Regex (matchRegex,mkRegex,Regex)

loghead = mkRegex "^([0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2},[0-9]{3} )" -- "2015-01-25 00:04:18,840"

logMerge::Regex->String->String->(String,[String]) logMerge logregex str accum = case matchRegex logregex str of Just _ -> (str,[(accum++"\n")]) Nothing -> case null accum of True -> (str,[]) False -> (accum ++ "<br>" ++ str,[])

runMerge::String->String->IO () runMerge infile outfile = runResourceT $ sourceFile infile $= linesUnboundedC $= concatMapAccumC (logMerge loghead ) "" $$ sinkFile outfile

================================================================

the example input file is --------- 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | | errorCode: toString() = null 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | codsexception.getErrorCode(): toString() { errorCode = "UNEXPECTED_PROBLEM" severity = "" } 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | | 2015-01-25 00:03:45,331 | DEBUG | WebContainer : 20 | | ---------

the expected output is --------- 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | | errorCode: toString() = null 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | codsexception.getErrorCode(): toString() <br>{<br> errorCode =<br>"UNEXPECTED_PROBLEM"<br> severity = ""<br>} 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | | 2015-01-25 00:03:45,331 | DEBUG | WebContainer : 20 | | ---------

the actual output is blow, missing the last line of log --------- 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | | errorCode: toString() = null 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | codsexception.getErrorCode(): toString() <br>{<br> errorCode =<br>"UNEXPECTED_PROBLEM"<br> severity = ""<br>} 2015-01-25 00:03:44,331 | DEBUG | WebContainer : 20 | | ---------

Thanks

...

在 2017年7月19日，下午7:50，Michael Snoyman mailto:michael@snoyman.com> 写道：

I'm afraid I doon't follow what it meant by the stream here. Could you provide a complete, runnable example and indicate what the expected and actual output are?

On Mon, Jul 17, 2017 at 5:48 AM, jun zhang mailto:zhangjun.julian@gmail.com> wrote: Dear cafes

I use Conduit to parse a huge file. And I need merge lines by condition.

I find the concatMapAccumC can do that and I write a demo as blow(with conduit-combinators-1.0.6,lts-6.18). The problem is if the last item didn’t make condition true, the data only keep in the accum but missing in stream.

Any one can give me some advises?

Thanks

---------------------------- import Conduit

test'::Int->Int->(Int,[Int]) test' a s = case (a+s) > 5 of True -> (0,[a+s]) False -> (a+s,[])

testlog::IO [Int] testlog = runConduit $ (yieldMany [1,2,3,4,5,6,3]) $= (concatMapAccumC test' 0 ) $$ sinkList

_______________________________________________ Haskell-Cafe mailing list To (un)subscribe, modify options or view archives go to: http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe Only members subscribed via the mailman list are allowed to post.