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Re^6: Why should any one use/learn Perl 6?

by haj (Hermit)
on Jun 11, 2018 at 18:29 UTC ( #1216424=note: print w/replies, xml ) Need Help??


in reply to Re^5: Why should any one use/learn Perl 6?
in thread Why should any one use/learn Perl 6?

haj: ...why I don't like these unicode operators: I have no idea how to enter it into my keyboard easily...
liz: FWIW, those characters live in my TouchBar on my MacBook Pro.

So, should I hop over to the Netherlands and let you type the character or steal your MacBook Pro instead?

I apologize for mocking you. This is going off-topic towards Unicode fine-print.

I now know that some browsers don't even show the difference between the characters in question.

What appears in your article is a ⚛️ character, which is not what you want to use in code. The difference between "⚛️" and "⚛" is that the former is one character composed of two codepoints: The atom symbol, U+269B, and the "VARIATION SELECTOR-16", U+FE0F. U+FEOF is a zero-width symbol which enforces emoji-style display for the preceding character. In Perl 6, "⚛️".chars is 1 and "⚛️".codes is 2.

The correct character to be used in prefix ++⚛ is the plain atom symbol U+269B. In Perl 6, "⚛".chars is 1 and "⚛".codes is also 1.

liz: That's not really a Perl 6 problem. I would say then that your preferred editor will have more and more problems surviving in a more and more unicodey world.

In the past, one could create nasty Perl 6 code by assigning operators to zero-width symbols, but as far as I know this is no longer possible, so I agree, it is no longer a Perl 6 problem. On the other hand, I am actually really, really happy that my editor did display the atom symbol (for which it has a glyph) and the zero-width symbol (for which it displays a "FE0F" surrogate glyph) as two separate entities, so it was rather obvious why Perl 6 complained about a "Bogus postfix".

For fun, try to type the following into a Perl 6 interactive shell, or feed it into the Perl 6 chat. Try to figure out which of the two fails before you paste it (Looking at the page source is considered cheating):

  • my atomicint $a = 1; $a⚛++; say $a
  • my atomicint $a = 1; $a⚛️++; say $a

I am in awe about the depth of Unicode support in Perl 6, as far as data are concerned. But I am not so happy about its use in code.

  • Comment on Re^6: Why should any one use/learn Perl 6?

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Re^7: Why should any one use/learn Perl 6?
by liz (Monsignor) on Jun 11, 2018 at 20:19 UTC
    So, should I hop over to the Netherlands and let you type the character or steal your MacBook Pro instead?

    You're welcome to try :-) But seriously, my point was that in the future there will be more ways to enter Unicode characters. Now, how that VARIATION SELECTOR-16 got there, it looks like it is a new feature of High Sierra :-( I've recently upgraded and am 100% sure it would not add the VARIATION SELECTOR-16 before. Grrr. It even does that from the Symbols viewer. Double Grrr.

    Thank you for spotting this. Wonder whether we would need to fix this in Perl 6 (so that it wouldn't matter if there is a VARIATION SELECTOR after it or not.

    With regards to possible confusion, that's also possible in the ASCII world: e.g. atomic-inc-fetch($ok) versus atomic_int_fetch or atonic-inc-fetch.

      liz: With regards to possible confusion, that's also possible in the ASCII world: e.g. atomic-inc-fetch($ok) versus atomic_int_fetch or atonic-inc-fetch.
      So true! I guess we all have been through that: 0 or O? l or 1 or |? _ or -? I try to make this more bearable by choosing a suitable font: This works reasonably well with the limited set of glyphs in ASCII, but is a considerable challenge for Unicode.

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