Here's how I think I'd tackle that "grid":
b2f ;,&LF&.> b
b2o ;:inv b
b2x > b
f2b cutLF f
f2o rplc&(LF,' ') f
f2x >cutLF f
o2b cut o
o2f rplc&(' ',LF) o
o2x >cut o
x2b <@dtb"1 x
x2f ;<@(,&LF)@dtb"1 x
x2o deb,' ',. x
FYI,
--
Raul
On Thu, May 26, 2022 at 11:46 AM Ian Clark <[email protected]> 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
> > > ----------------------------------------------------------------------
> > > For information about J forums see http://www.jsoftware.com/forums.htm
> >
> >
> > --
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> >
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> >
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