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Groups > comp.lang.java.programmer > #39448

Re: Character.isIdentifierIgnorable

From Arne Vajhøj <arne@vajhoej.dk>
Newsgroups comp.lang.java.programmer
Subject Re: Character.isIdentifierIgnorable
Date 2020-04-25 12:57 -0400
Organization Aioe.org NNTP Server
Message-ID <r81q59$1r7i$2@gioia.aioe.org> (permalink)
References (2 earlier) <r7vv8t$8a7$1@dont-email.me> <r80097$r5a$1@gioia.aioe.org> <r800o5$fga$1@dont-email.me> <r80703$peb$1@gioia.aioe.org> <r80b7t$1us$1@dont-email.me>

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On 4/24/2020 11:36 PM, Jeff Higgins wrote:
> On 4/24/20 10:24 PM, Arne Vajhøj wrote:
>> On 4/24/2020 8:37 PM, Jeff Higgins wrote:
>>> On 4/24/20 8:29 PM, Arne Vajhøj wrote:
>>>> I think we are in the far out corners of the language.
>>>>
>>> Well, yeah, but still.
>>> And still leaves me questioning motivation for ignorable chars.
>>
>> We would need to find someone working at SUN back in the mid 90's
>> to know.
>>
>> If I were to guess then somebody got the "smart" idea that
>> the language should not distinguish between names where
>> the difference could not be seen when type'd/cat'ed and
>> then someone else later added the \uXXXX feature.
>>
> Maybe not that far back.
> 
> from JLS-3.8 for JavaSE 9
> Two identifiers are the same only if they are identical, that is, have 
> the same
> Unicode character for each letter or digit. Identifiers that have the 
> same external
> appearance may yet be different.
> 
> from JLS-3.8 for JavaSE 10
> Two identifiers are the same only if, after ignoring characters that are
> ignorable, the identifiers have the same Unicode character for each letter
> or digit. An ignorable character is a character for which the method
> Character.isIdentifierIgnorable(int) returns true. Identifiers that have 
> the
> same external appearance may yet be different.

But Java 8 javac did ignore them??

Arne

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Thread

Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-24 18:46 -0400
  Re: Character.isIdentifierIgnorable Arne Vajhøj <arne@vajhoej.dk> - 2020-04-24 18:54 -0400
    Re: Character.isIdentifierIgnorable Martin Gregorie <martin@mydomain.invalid> - 2020-04-24 23:07 +0000
    Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-24 20:12 -0400
      Re: Character.isIdentifierIgnorable Arne Vajhøj <arne@vajhoej.dk> - 2020-04-24 20:29 -0400
        Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-24 20:37 -0400
          Re: Character.isIdentifierIgnorable Arne Vajhøj <arne@vajhoej.dk> - 2020-04-24 22:24 -0400
            Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-24 23:36 -0400
              Re: Character.isIdentifierIgnorable Arne Vajhøj <arne@vajhoej.dk> - 2020-04-25 12:57 -0400
                Re: Character.isIdentifierIgnorable Arne Vajhøj <arne@vajhoej.dk> - 2020-04-25 13:01 -0400
                Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-25 13:39 -0400
                Re: Character.isIdentifierIgnorable Arne Vajhøj <arne@vajhoej.dk> - 2020-04-25 13:51 -0400
                Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-25 14:36 -0400
            Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-24 23:41 -0400
    Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-24 20:25 -0400
      Re: Character.isIdentifierIgnorable Arne Vajhøj <arne@vajhoej.dk> - 2020-04-24 20:32 -0400
        Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-24 20:42 -0400
          Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-25 09:53 -0400
            Re: Character.isIdentifierIgnorable Arne Vajhøj <arne@vajhoej.dk> - 2020-04-25 12:55 -0400
              Re: Character.isIdentifierIgnorable Jeff Higgins <invalid@invalid.org> - 2020-04-25 13:43 -0400

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