Re: [QUERY] Support Unicode escapes in the Lisp reader, à la Java

Aidan Kehoe <kehoea(a)parhasard.net&gt; wrote: What version of Java has the \U escapes? The language specification says that only lower-case 'u' is a Unicode escape: http://java.sun.com/docs/books/jls/third_edition/html/lexical.html#3.3 and that representing supplementary characters requires two consecutive \u escapes (because Java means "UTF-16" when it says "Unicode"). Indeed, try this experiment with Sun's JDK 1.5.0_06. This code compiles and prints what is expected when run: public class Test { public static void main(String[] args) { System.out.println("This is a zero: " + '\u0030'); } } but this one produces compiler errors: public class Test { public static void main(String[] args) { System.out.println("This is a zero: " + '\U00000030'); } } $ javac Test.java Test.java:3: illegal escape character System.out.println("This is a zero: " + '\U00000030'); ^ Test.java:3: unclosed character literal System.out.println("This is a zero: " + '\U00000030'); ^ Test.java:3: unclosed character literal System.out.println("This is a zero: " + '\U00000030'); ^ Test.java:3: ')' expected System.out.println("This is a zero: " + '\U00000030'); ^ 4 errors (Not that I'm saying it's a bad idea for us to do it that way. I'm just questioning the claim that Java does it that way.) Regards, -- Jerry James, Assistant Professor james(a)xemacs.org Computer Science Department http://www.cs.usu.edu/~jerry/ Utah State University