ZWNJ contextual rule

[Patrik Fältström]

Mark, I now saw you had pseudo code in a different email message...let  
me digest that before you spend more time on this.

    paf

On 15 jul 2009, at 14.54, Patrik Fältström wrote:

> On 5 nov 2008, at 03.15, Mark Davis wrote:
>
>> For example, the rules for ZWNJ which don't match actual usage,
>
> Can you explain what "actual usage" is?
>
> The rule in -05 are now:
>
> Appendix A.2.  ZERO WIDTH NON-JOINER
>   Code point:
>      U+200C
>   Overview:
>      Between two characters from the same script only.  The script  
> must
>      be one in which the use of this character causes significant
>      visual transformation of one or both of the adjacent characters.
>   Lookup:
>      True
>   Rule Set:
>      False;
>      If Script(Before(cp)) .eq. ( Deva | Tamil | Arabic ) And
>         Script(After(cp)) .eq. ( Deva | Tamil | Arabic ) And
>         Script(Before(cp)) .eq.  Script(After(cp)) Then True;
>      If Not
>         RegExpMatch((Joining_Type:L)(Joining_Type:
>         T)*\u200C(Joining_Type:T)*(Joining_Type:R))
>         Then False;
>
>   Patrik
>
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