no typo.
[: (#~ ([: +./\. ' '&~:))&.> <"1 ] 3 7$'alpha bravo charlie'
=>
(#~ ([: +./\. ' '&~:))&.> @: (<"1) 3 7$'alpha bravo charlie'
=>
]&.> @: (<"1) 3 7$'alpha bravo charlie' NB. still fails
=>
]&.> @: (<"0) 'ab' NB. still fails
Henry Rich
On 5/26/2022 11:45 AM, Ian Clark wrote:
Henry wrote:
The problem was with the form
[&.>@:(<"0) 'ab'
(used in x2b).
x2b is defined as:
[: (#~ ([: +./\. ' '&~:))&.> <"1
so I guess that was a typo. But I get the idea.
So… no need for me to make any changes to 'format/zulu' just yet.
ASIDE:
--but when I do, I'll throw away the entire implementation.
Zulu addresses an enduring need for the J beginner wanting to develop code
for distribution. But it's deprecated for operational use.
Zulu is an awful example of the edge-case 'tail' wagging the JAL 'dog'.
If we ever get a *usable* addon, or a primitive (?), which comprehensively
supports dictionaries, or even just collections of strings, then I hope &
pray it eats Zulu for breakfast.
Zulu's aims could be met by publishing a 4x4 grid of recommended
*consistent* conversions between the 4 common "strings" formats:
b - boxed
f - LF-separated
o - open
x - matrix
See the lab: Strings conversion package.
WHAT'S MORE:
A user-facing app doing smart things with LF-separated strings must adopt a
policy towards final LF, especially for handling a collection of substrings
containing 0 or 1 members.
Zulu adopts the wrong policy. And pays for it with lots of slow edge-case
code.
On Wed, 25 May 2022 at 18:24, Henry Rich <[email protected]> wrote:
Fixed for next beta. The problem was with the form
[&.>@:(<"0) 'ab'
(used in x2b). The <"n created virtual blocks but erroneously flagged
them as inplaceable.
Workaround: replace (<"n) with (<"<"n).
Henry Rich
On 5/24/2022 8:25 PM, Ian Clark wrote:
Note: Addon 'format/zulu' does not crash 903 or earlier.
JVERSION
Engine: j904/j64/darwin
Beta-d: commercial/2022-05-19T20:41:44
Library: 9.04.01
Qt IDE: 2.0.3/6.2.4(6.2.4)
Platform: Darwin 64
Installer: J904 install
InstallPath: /applications/j904
Contact: www.jsoftware.com
Addon 'format/zulu' is required by various addons, notably math/tabula.
If loaded directly or indirectly by your ~config/startup.ijs
then JQt will terminate without showing output.
jconsole will terminate also, but gives a briefer, clearer crash report:
jconsole(2607,0x104ba4580) malloc: *** error for object 0x138091fc0:
pointer being freed was not allocated
jconsole(2607,0x104ba4580) malloc: *** set a breakpoint in
malloc_error_break to debug
zsh: abort /Applications/j904/bin/jconsole
Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.
[Process completed]
The crash is caused by execution of a verb: zutest_zulu_ .
This verb gets executed as the final step in loading addon 'format/zulu'
.
It contributes nothing to the functionality of this suite of string
utilities, but gives all the working verbs a thorough test.
I hope to find out why it crashes before the weekend. Meanwhile, here is
a
workaround.
It won't affect the operational behavior of the addon, but it's like
turning off the fire alarms.
Launch either jqt or jcon (any recent version)…
STEP 1
open'~addons/format/zulu/zutest.ijs'
STEP 2
Comment-out lines 64-66:
ok1=. ; 0 zutest each ;:'zu z1 z0'
ok2=. ;0j1 zutest each ;:'zu z1 z0' NB. for conversions: a2*
ZUTEST_z_=: ok1 , ok2
STEP 3
Save the updated script.
Now you can triger the crash at will in either JQt or jcon like this:
load 'format/zulu' NB. should not crash now
0 zutest 'zu' NB. crashes
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