Groups > comp.lang.java.programmer > #20985

Re: question on java lang spec chapter 3.3 (unicode char lexing)

Newsgroups	comp.lang.java.programmer
Date	2013-01-05 05:34 -0800
References	(1 earlier) <km19e81cvgra3q7q7ck2gi2lokpe9q4el0@4ax.com> <50e4d730$0$288$14726298@news.sunsite.dk> <24e3a8de-a422-4d4e-a319-aeedddb9df03@googlegroups.com> <NYqdnSF1y-Gvu3jNnZ2dnUVZ_qmdnZ2d@earthlink.com> <WZ6dnS6Bc7o4vnXNnZ2dnUVZ8kOdnZ2d@bt.com>
Message-ID	<70744efd-9848-42ef-944f-dcd667f75045@googlegroups.com> (permalink)
Subject	Re: question on java lang spec chapter 3.3 (unicode char lexing)
From	"Aryeh M. Friedman" <Aryeh.Friedman@gmail.com>

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On Saturday, January 5, 2013 7:58:57 AM UTC-5, Chris Uppal wrote:
> Patricia Shanahan wrote:
> 
> 
> 
> > You would at least need to detect the escapes to get a usable error
> 
> > message. Once you have done that, it is so easy to replace each escape
> 
> > with the equivalent Unicode character that it is not worth doing
> 
> > anything else.
> 
> 
> 
> I'm not so sure about that.  IIRC the rules about interpretting Unicode escapes 
> 
> have some seriously wierd convolutions. Something to do with protecting against 
> 
> multiply-encoded files, I think.  It badly fails the Principle of Least WTF.
> 
> 
> 
> It's in the spec, but I'm too lazy to go find the exact reference :-(
> 
> 
> 
>     -- chruis

agreed for example the following is just ugly but perfectly valid Java code:

Foo.java:
\u0070\u0075\u0062\u006C\u0069\u0063\u0020\u0063\u006C\u0061\u0073\u0073\u0020\u0046\u006F\u006F\u000A\u007B\u000A\u0009\u0070\u0075\u0062\u006C\u0069\u0063\u0020\u0073\u0074\u0061\u0074\u0069\u0063\u0020\u0076\u006F\u0069\u0064\u0020\u006D\u0061\u0069\u006E\u0028\u0053\u0074\u0072\u0069\u006E\u0067\u005B\u005D\u0020\u0061\u0072\u0067\u0073\u0029\u000A\u0009\u007B\u000A\u0009\u0009\u0053\u0079\u0073\u0074\u0065\u006D\u002E\u006F\u0075\u0074\u002E\u0070\u0072\u0069\u006E\u0074\u006C\u006E\u0028\u0022\u0068\u0065\u006C\u006C\u006F\u002C\u0020\u0077\u006F\u0072\u006C\u0064\u0022\u0029\u003B\u000A\u0009\u007D\u000A\u007D\u000A

% javac Foo.java
% java Foo
hello, world

Thread

question on java lang spec chapter 3.3 (unicode char lexing) "Aryeh M. Friedman" <Aryeh.Friedman@gmail.com> - 2013-01-02 00:20 -0800
  Re: question on java lang spec chapter 3.3 (unicode char lexing) "Aryeh M. Friedman" <Aryeh.Friedman@gmail.com> - 2013-01-02 00:24 -0800
    Re: question on java lang spec chapter 3.3 (unicode char lexing) Patricia Shanahan <pats@acm.org> - 2013-01-02 12:24 -0800
  Re: question on java lang spec chapter 3.3 (unicode char lexing) Lew <lewbloch@gmail.com> - 2013-01-02 11:16 -0800
    Re: question on java lang spec chapter 3.3 (unicode char lexing) Arne Vajhøj <arne@vajhoej.dk> - 2013-01-02 19:55 -0500
      Re: question on java lang spec chapter 3.3 (unicode char lexing) Lew <lewbloch@gmail.com> - 2013-01-02 17:21 -0800
        Re: question on java lang spec chapter 3.3 (unicode char lexing) Arne Vajhøj <arne@vajhoej.dk> - 2013-01-02 20:40 -0500
  Re: question on java lang spec chapter 3.3 (unicode char lexing) Roedy Green <see_website@mindprod.com.invalid> - 2013-01-02 11:17 -0800
    Re: question on java lang spec chapter 3.3 (unicode char lexing) Arne Vajhøj <arne@vajhoej.dk> - 2013-01-02 19:56 -0500
      Re: question on java lang spec chapter 3.3 (unicode char lexing) "Aryeh M. Friedman" <Aryeh.Friedman@gmail.com> - 2013-01-02 17:27 -0800
        Re: question on java lang spec chapter 3.3 (unicode char lexing) "Aryeh M. Friedman" <Aryeh.Friedman@gmail.com> - 2013-01-02 17:32 -0800
        Re: question on java lang spec chapter 3.3 (unicode char lexing) Lew <lewbloch@gmail.com> - 2013-01-02 17:42 -0800
          Re: question on java lang spec chapter 3.3 (unicode char lexing) "Aryeh M. Friedman" <Aryeh.Friedman@gmail.com> - 2013-01-02 17:55 -0800
            Re: question on java lang spec chapter 3.3 (unicode char lexing) "Aryeh M. Friedman" <Aryeh.Friedman@gmail.com> - 2013-01-02 18:02 -0800
              Re: question on java lang spec chapter 3.3 (unicode char lexing) Arne Vajhøj <arne@vajhoej.dk> - 2013-01-02 21:12 -0500
                Re: question on java lang spec chapter 3.3 (unicode char lexing) "Aryeh M. Friedman" <Aryeh.Friedman@gmail.com> - 2013-01-02 18:16 -0800
                Re: question on java lang spec chapter 3.3 (unicode char lexing) Arne Vajhøj <arne@vajhoej.dk> - 2013-01-02 21:20 -0500
                Re: question on java lang spec chapter 3.3 (unicode char lexing) "Aryeh M. Friedman" <Aryeh.Friedman@gmail.com> - 2013-01-02 18:22 -0800
                Re: question on java lang spec chapter 3.3 (unicode char lexing) Arne Vajhøj <arne@vajhoej.dk> - 2013-01-02 21:26 -0500
                Re: question on java lang spec chapter 3.3 (unicode char lexing) "Aryeh M. Friedman" <Aryeh.Friedman@gmail.com> - 2013-01-02 18:27 -0800
                Re: question on java lang spec chapter 3.3 (unicode char lexing) Arne Vajhøj <arne@vajhoej.dk> - 2013-01-02 21:46 -0500
                Re: question on java lang spec chapter 3.3 (unicode char lexing) "Aryeh M. Friedman" <Aryeh.Friedman@gmail.com> - 2013-01-02 20:41 -0800
                Re: question on java lang spec chapter 3.3 (unicode char lexing) Arne Vajhøj <arne@vajhoej.dk> - 2013-01-06 21:54 -0500
            Re: question on java lang spec chapter 3.3 (unicode char lexing) Arne Vajhøj <arne@vajhoej.dk> - 2013-01-02 21:15 -0500
              Re: question on java lang spec chapter 3.3 (unicode char lexing) "Aryeh M. Friedman" <Aryeh.Friedman@gmail.com> - 2013-01-02 18:20 -0800
        Re: question on java lang spec chapter 3.3 (unicode char lexing) Arne Vajhøj <arne@vajhoej.dk> - 2013-01-02 21:17 -0500
        Re: question on java lang spec chapter 3.3 (unicode char lexing) Patricia Shanahan <pats@acm.org> - 2013-01-02 22:33 -0800
          Re: question on java lang spec chapter 3.3 (unicode char lexing) "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2013-01-05 12:58 +0000
            Re: question on java lang spec chapter 3.3 (unicode char lexing) "Aryeh M. Friedman" <Aryeh.Friedman@gmail.com> - 2013-01-05 05:34 -0800
              Re: question on java lang spec chapter 3.3 (unicode char lexing) "Aryeh M. Friedman" <Aryeh.Friedman@gmail.com> - 2013-01-05 05:40 -0800
              Re: question on java lang spec chapter 3.3 (unicode char lexing) Arne Vajhøj <arne@vajhoej.dk> - 2013-01-06 21:56 -0500
      Re: question on java lang spec chapter 3.3 (unicode char lexing) Martin Gregorie <martin@address-in-sig.invalid> - 2013-01-03 21:14 +0000
        Re: question on java lang spec chapter 3.3 (unicode char lexing) Arne Vajhøj <arne@vajhoej.dk> - 2013-01-03 17:51 -0500
          Re: question on java lang spec chapter 3.3 (unicode char lexing) "Aryeh M. Friedman" <Aryeh.Friedman@gmail.com> - 2013-01-03 20:54 -0800
            Re: question on java lang spec chapter 3.3 (unicode char lexing) Martin Gregorie <martin@address-in-sig.invalid> - 2013-01-05 00:15 +0000
            Re: question on java lang spec chapter 3.3 (unicode char lexing) "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2013-01-05 13:03 +0000
              Re: question on java lang spec chapter 3.3 (unicode char lexing) "Aryeh M. Friedman" <Aryeh.Friedman@gmail.com> - 2013-01-05 05:25 -0800
                Re: question on java lang spec chapter 3.3 (unicode char lexing) Arne Vajhøj <arne@vajhoej.dk> - 2013-01-06 21:49 -0500
                Re: question on java lang spec chapter 3.3 (unicode char lexing) "Aryeh M. Friedman" <Aryeh.Friedman@gmail.com> - 2013-01-06 23:26 -0800
            Re: question on java lang spec chapter 3.3 (unicode char lexing) Arne Vajhøj <arne@vajhoej.dk> - 2013-01-06 21:44 -0500
  Re: question on java lang spec chapter 3.3 (unicode char lexing) Arne Vajhøj <arne@vajhoej.dk> - 2013-01-02 19:54 -0500

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