JSON anomaly with ⎕DF Display Form

General APL language issues

JSON anomaly with ⎕DF Display Form

Postby petermsiegel on Sun Oct 20, 2019 12:14 am

This is a bit odd. (Though I can guess what's going on, I won't).
Changing a display form for a simple JSON object adds a phantom entry in ⎕JSON calls to view object.
Code: Select all
        )reset
       a←⎕JSON '{"red":0,"orange":1}'
       a.⎕DF 'display form'
       a.⎕NL -⍳12                   ⍝ Looks good
┌──────┬───┐
│orange│red│
└──────┴───┘
⍝ A new field with an unusual name appears holding the ⎕DF (display form) value.
        ⎕JSON⍠'D'⊣a                ⍝ Default (⍠'D') and ⍠'M' both show oddity!
{"orange":1,"red":0,"ᐐཫ\u0001":"display form"}  ⍝ internal magic ==> unicode?
       a.⎕NL -⍳12                  ⍝ Still looks good
┌──────┬───┐
│orange│red│
└──────┴───┘
       ⎕←a.⎕DF ''                  ⍝ We nulled out the ⎕DF for the object.
display form
       ⎕JSON⍠'D'⊣a                 ⍝ Odd display form (⎕DF) rogue entry still here!!!
{"orange":1,"red":0,"ᐐཫ\u0001":""}     
petermsiegel
 
Posts: 66
Joined: Thu Nov 11, 2010 11:04 pm

Re: JSON anomaly with ⎕DF Display Form

Postby Richard|Dyalog on Mon Oct 21, 2019 4:51 pm

The namespace display form should not have been exposed by ⎕JSON at all. That has been fixed in the development interpreter (18.0) but not earlier versions; the reference for the fix is Mantis 16644.

I will reopen that issue to get the fix ported to all supported versions.
User avatar
Richard|Dyalog
 
Posts: 40
Joined: Thu Oct 02, 2008 11:11 am

Re: JSON anomaly with ⎕DF Display Form

Postby petermsiegel on Tue Oct 22, 2019 3:49 am

I was so much looking forward to using the "Unified Canadian aboriginal syllabics" character (UCS 5136), aka the "Wii" Emoji, in all my programs!
petermsiegel
 
Posts: 66
Joined: Thu Nov 11, 2010 11:04 pm


Return to Language

Who is online

Users browsing this forum: No registered users and 1 guest