Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.programmer > #20986

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

Show all headers | View raw

On Saturday, January 5, 2013 8:34:38 AM UTC-5, Aryeh M. Friedman wrote:
> 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

Just a quick note I did end up implementing unicode escapes the way JLSv3 says to and the above is one our test inputs...

Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

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

csiph-web