Is PeekableStream available in 3.1?

I see it sitting in the kernel directory but when I try to use it
for subclassing, I get the following complaint :

key PeekableStream not found

_______________________________________________
help-smalltalk mailing list
[hidden email]
http://lists.gnu.org/mailman/listinfo/help-smalltalk

On Wed, 19 May 2010 16:34:14 -0700, Rick Flower <[hidden email]>
wrote:
> I see it sitting in the kernel directory but when I try to use it
> for subclassing, I get the following complaint :
>
> key PeekableStream not found

In looking at it further I believe it's related to the
namespace it's sitting in (kernel) whereas the regular
Stream class has no namespace reference.. I guess I'll
have to see how to get into the kernel namespace for
my subclass.. Time to RTFM!

_______________________________________________
help-smalltalk mailing list
[hidden email]
http://lists.gnu.org/mailman/listinfo/help-smalltalk

On Wed, 19 May 2010 16:47:58 -0700, Rick Flower <[hidden email]>
wrote:
I'm now referring to build 3.2 (but 3.1 shows the same
issue)..

Ok.. Did the RTFM thing and found that if I add "Kernel."
to the front of the PeekableStream reference that I get
further but not without a core dump.. Below is the sub
class I'm working on -- it doesn't seem to matter whether
I've defined any methods or not -- the result is the same:

Kernel.PeekableStream subclass: PositionableStream [

]

When I run my script I get the following :

Recompiling classes...
Recompiling class: PositionableStream
Recompiling selector: #peek
Recompiling selector: #readStream
Recompiling selector: #close
Recompiling selector: #copyFrom:to:
Recompiling selector: #contents
Recompiling selector: #isEmpty
Recompiling selector: #position
Recompiling selector: #peekFor:
Recompiling selector: #position:
Recompiling selector: #reset
Recompiling selector: #size
Recompiling selector: #skip:
Recompiling selector: #species
Recompiling selector: #upToEnd
Recompiling selector: #upTo:
Recompiling selector: #reverseContents
Recompiling selector: #basicAtEnd
Recompiling selector: #basicPosition:
Recompiling selector: #truncate
Recompiling selector: Segmentation fault (core dumped)

core 'core' of 5788:    /export/home/rickf/gst/bin/gst -f ./test.st
 ff2afdd8 _gst_mark_an_oop_internal (fac0e1e8, eaa4a924, eaa4a940, 0, 0,
0)
 ff2afec8 _gst_mark_an_oop_internal (fac0e598, eaa4a8c4, eaa4a8e8, 0, 0,
0) + f0
 ff2afec8 _gst_mark_an_oop_internal (fac0e828, eaa4a864, eaa4a890, 0, 0,
0) + f0
 ff2afec8 _gst_mark_an_oop_internal (fac0f230, eaa4a804, eaa4a824, 0, 0,
0) + f0
 ff2afec8 _gst_mark_an_oop_internal (fac0f6c0, eaa4a7a4, eaa4a7c8, 0, 0,
0) + f0
 ff2afec8 _gst_mark_an_oop_internal (fac0f998, eaa4a744, eaa4a760, 0, 0,
0) + f0
 ff2afec8 _gst_mark_an_oop_internal (fac0fcd0, eaa4a6e4, eaa4a708, 0, 0,
0) + f0
 ff2afec8 _gst_mark_an_oop_internal (fac0ff58, eaa4a684, eaa4a6b0, 0, 0,
0) + f0
.
.
.
 ff2afec8 _gst_mark_an_oop_internal (fadae6b8, eb470984, eb4709a0, a7,
ff36a298, 2) + f0
 ff2b2090 _gst_global_gc (0, 0, 0, 0, 0, 0) + 168
 ff2b2a4c _gst_scavenge (0, ea83efb4, 10040, ff366540, 67dca8, 70000000) +
88
 ff2f10b4 _gst_send_message_internal (0, 0, 9, fac1bc58, 11f0, ebc) + 878
 ff2fd27c _gst_interpret (1208, 1fc4, ff2fd220, 1de8, 1fbc, 2080) + 82f0
 ff301864 _gst_nvmsg_send (fac47748, fac082f0, ffbeecfc, 1, 2c, ffbeed49)
+ 188
 ff2d433c _gst_va_msg_sendf (ffbeef2c, ff32a808, ffbeef1c, ff2d4b4c,
ffbeecf8, ffbeecf8) + 264
 ff2d4c44 _gst_msg_sendf (ffbeef2c, ff32a808, fac47748, 38b800, 3a000000,
3a000000) + 20
 ff2970b8 parse_doit (ffbef030, 0, 0, 4, 88, ffbef108) + 480
 ff297684 parse_chunks (ffbef030, ff2979b4, 0, 0, 0, 204) + dc
 ff297a00 _gst_parse_chunks (1, fe8, 7, ff2da2d4, ff2da224, 0) + 18c
 ff298168 _gst_parse_stream (0, 37ad58, ff2e67d4, ff331da0, 2183c,
ff217a80) + 68
 ff2cdba8 _gst_process_file (ffbef464, 0, a, 0, 2e2f7263, 2d000000) + 88
 00011614 main     (4, ffbef2e4, ffbef2f8, 251e4, 0, 0) + 150
 00010db8 _start   (0, 0, 0, 0, 0, 0) + 5c

_______________________________________________
help-smalltalk mailing list
[hidden email]
http://lists.gnu.org/mailman/listinfo/help-smalltalk

On Thu, May 20, 2010 at 03:19, Rick Flower <[hidden email]> wrote:
The core dump is obviously not expected.

However, the PeekableStream is in "Kernel" because you're not supposed
to refer to it.

Whenever you send #peek to a Stream that doesn't implement it itself
(and PositionableStreams do), it is transformed behind the scenes to a
PeekableStream.

Paolo

_______________________________________________
help-smalltalk mailing list
[hidden email]
http://lists.gnu.org/mailman/listinfo/help-smalltalk

Paolo,

The reason I was subclassing that class was to add in the missing (at  
least in gst 3.1) PositionableStream class so I could use the upToAll  
method on a pipe..

On May 20, 2010, at 12:37 AM, Paolo Bonzini <[hidden email]> wrote:

_______________________________________________
help-smalltalk mailing list
[hidden email]
http://lists.gnu.org/mailman/listinfo/help-smalltalk

On Thu, May 20, 2010 at 18:04, Rick Flower <[hidden email]> wrote:
> Paolo,
>
> The reason I was subclassing that class was to add in the missing (at least
> in gst 3.1) PositionableStream class so I could use the upToAll method on a
> pipe..

#upToAll: is implemented in Stream, so it is usable in either Stream
or PeekableStream or PositionableStream or anything else. :-)

Paolo

_______________________________________________
help-smalltalk mailing list
[hidden email]
http://lists.gnu.org/mailman/listinfo/help-smalltalk

On Thu, 20 May 2010 19:00:05 +0200, Paolo Bonzini <[hidden email]> wrote:
Thanks Paolo.. In looking at both GST 3.1 and 3.2 I see that the
PositionableStream class is in fact implemented.. Go figure!  I'm not
sure what I must have been searching for yesterday as I didn't see if
when I looked.. Perhaps I had a brain fart and was looking for
something like "PositionalStream" which is wrong.. Oh well.. I'll calm
down next time and do a more thorough search!!

_______________________________________________
help-smalltalk mailing list
[hidden email]
http://lists.gnu.org/mailman/listinfo/help-smalltalk