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   RE: Character classification

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  • From: Andrew Layman <andrewl@microsoft.com>
  • To: xml-dev@ic.ac.uk
  • Date: Wed, 3 Sep 1997 13:39:48 -0700

JDK 1.1 is still broken for Unicode.  Take a look at the code in the
Microsoft XML Parser (http://www.microsoft.com/standards/xml) to see our

--Andrew Layman

> -----Original Message-----
> From:	Tim Bray [SMTP:tbray@textuality.com]
> Sent:	Wednesday, September 03, 1997 12:51 PM
> To:	xml-dev@ic.ac.uk
> Subject:	Character classification
> I've been working on making Lark really do Unicode.  JDK 1.1 is
> supposed
> to have, unlike 1.0, a usable input method; thus the problem is to
> check,
> when you're reading a GI or Attribute name, whether the characters are
> legal namestart/name characters.
> It turns out to be quite a lot of work, so this is an offer to share.
> I wrote a program (based on Lark) that pulls the relevant character
> classes out of the XML spec, picks apart the markup, and writes
> another
> Java class that has some static arrays and offers two methods:
> package textuality.lark;
> public class CharClasses
> {
>  public static boolean isNameC(char c)
>  public static boolean isNameStart(char c)
> }
> It needs about 4k of tables (which it binary-searches); it might be
> faster
> with 128k of byte-addressable tables or 16K of bitmaps, neither of
> which
> would be hard to implement.
> (a) is this a waste of time, i.e. are there Unicode library calls that
>     do it?
> (b) if not, has everyone else already done this?
> (c) if not, if I'm going to publish this, is the API above OK?
> I've attached the current Java source file for those who find the 
> explanation above insufficiently clear.
> Cheers, Tim Bray
> tbray@textuality.com http://www.textuality.com/ +1-604-708-9592 <<
> File: CharClasses.java.txt >> 

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