Re: [Pharo-users] iterating through an ascii file by line

Aug. 3, 2012


      Hi Sven,
I didn't tried in Pharo 2.0 because is not stable. In Pharo 1.4 this works

FileStream fileNamed: 'd:\Test\filter.csv' do: [ :readStream |
        | lineReader |
        lineReader := ZnLineReader on: readStream.
        Array streamContents: [ :output |
                | line |
                [ (line := lineReader nextLine) isEmpty ]
                        whileFalse: [ output nextPut: line ] ] ].

but this script fails:

'd:\Test\filter.csv' asFileReference readStreamDo: [ :readStream |
         | lineReader |
         lineReader := ZnLineReader on: readStream.
         Array streamContents: [ :output |
                 | line |
                 [ (line := lineReader nextLine) isEmpty ]
                         whileFalse: [ output nextPut: line ] ] ].

probably a problem with #asFileReference
Cheers,

HernÃ¡n

2012/8/2 Sven Van Caekenberghe <sven@beta9.be>
...
HernÃ¡n,
On 01 Aug 2012, at 20:50, HernÃ¡n Morales Durand <hernan.morales@gmail.com>
wrote:
...
2012/8/1 Sven Van Caekenberghe <sven@beta9.be>
Paul,
On 31 Jul 2012, at 18:25, Paul DeBruicker <pdebruic@gmail.com> wrote:
...
Is there an easy/standard way to open an ascii file and iterate
through it line by line?
...
...
I want to put several files contents into their own OrderedCollections
and then do awful things to them. The files are ~500MB each
This uses code that is already in Pharo:
'/tmp/foo.txt' asFileReference readStreamDo: [ :readStream |
        | lineReader |
        lineReader := ZnLineReader on: readStream.
        Array streamContents: [ :output |
                | line |
                [ (line := lineReader nextLine) isEmpty ]
                        whileFalse: [ output nextPut: line ] ] ]
Works with any line end convention. Check the class comment of
ZnLineReader.
No, it doesn't work in latest Pharo 1.4 (14557)
MessageNotUnderstood: FileSystemReadStream>>isBinary
Cheers,
HernÃ¡n
I did try the code snippet on Pharo 2.0 before posting it, it worked.
I just tried the following on Pharo 1.4, and it works as well.
FileStream fileNamed: '/tmp/foo.txt' do: [ :readStream |
        | lineReader |
        lineReader := ZnLineReader on: readStream.
        Array streamContents: [ :output |
                | line |
                [ (line := lineReader nextLine) isEmpty ]
                        whileFalse: [ output nextPut: line ] ] ]
Maybe you tried using some FileSystem port on 1.4 that is not as complete
as the code that is by default in 2.0 ?
But ZnLineReader is independent of that, it has been part of Zn since
years, in Pharo 1.3 and up.
Sven