Hi sven I wonder how we can make progress on this front. Because we should move on. I'm fed up to get all this crap of the old stream around. Could not we just keep positionable stream and start to get rest nice? Stef On Tue, Oct 3, 2017 at 4:22 PM, Sven Van Caekenberghe <sven@stfx.eu> wrote:
On 3 Oct 2017, at 10:53, Guillermo Polito <guillermopolito@gmail.com> wrote:
Yes, in my todo, but changing FileReference like that will break a lot of backwards compatibility :)
Yes it will.
I have said this before: the problem is that the current stream API is much too wide, we need to trim it to something closer to what a stream is (and not assume that a stream always lives on top of a collection).
We have compassable streams now, they work well. But they cannot implement the full API (since they are not streaming over collections). The biggest issue are the positioning message (like #skip: and #position:) which assume you known where you are and can move around at will, which is not possible for a real, indefinite stream.
On Mon, Oct 2, 2017 at 10:22 AM, Stephane Ducasse <stepharo.self@gmail.com> wrote: Yes this is why we should continue to clean and remove cruft. Now I remember that guille did that for File.
Stef
On Mon, Oct 2, 2017 at 3:20 PM, Sven Van Caekenberghe <sven@stfx.eu> wrote:
If you do
(File named: '/tmp/lines.txt') readStream[Do:]
you seem to get a binary stream (this is the new implementation I guess), when you go via FileReference you get a character stream (but that are old ones).
I know, very confusing. We're always in the midst of transitions.
On 2 Oct 2017, at 15:17, Stephane Ducasse <stepharo.self@gmail.com> wrote:
Sven I do not see the binary stream. Is it ZnCharacterReadStream?
Stef
On Mon, Oct 2, 2017 at 1:22 PM, Sven Van Caekenberghe <sven@stfx.eu> wrote:
Hi,
On 2 Oct 2017, at 13:07, Dirk Olmes <dirk@xanthippe.ping.de> wrote:
Hi,
I'm trying to get started with Pharo doing something really simple - at least that's what I thought ... I'm trying to read a text file line by line.
If I use File named: '/tmp/linex.txt' readStream nextLine I'll get a debugger telling me that BinaryFileStream does not understand nextLine.
Now I've tried my best to find a stream that may be reading plain text lines but to no avail ...
Help!
-dirk
$ cat > /tmp/lines.txt one two three
(FileLocator temp / 'lines.txt') contents lines.
'/tmp/lines.txt' asFileReference contents lines.
'/tmp/lines.txt' asFileReference readStreamDo: [ :in | Array streamContents: [ :out | [ in atEnd ] whileFalse: [ out nextPut: in nextLine ] ] ].
(File named: '/tmp/lines.txt') readStreamDo: [ :in | | characterStream | characterStream := ZnCharacterReadStream on: in. Array streamContents: [ :out | [ characterStream atEnd ] whileFalse: [ out nextPut: characterStream nextLine ] ] ].
They all return #('one' 'two' 'three').
In the last, more complex example, you first get a binary stream (and a 'line' is a character based concept), so wrapping the binary stream in a character read stream (which does know about lines) solves the problem.
HTH,
Sven
--
Guille Polito Research Engineer
Centre de Recherche en Informatique, Signal et Automatique de Lille CRIStAL - UMR 9189 French National Center for Scientific Research - http://www.cnrs.fr
Web: http://guillep.github.io Phone: +33 06 52 70 66 13