Unicode and the higher planes of existence.

[Peter W A Wood]

According to the User Guide, LiveCode employs UTF-16 encoding: 

"LiveCode fields and other controls use the UTF-16 encoding for Unicode. In order to use Unicode in a field or in the labels of controls, paste in Unicode text, or set the textFont of the control to ",unicode"."

As I understand, characters beyond the Basic Multilingual Plane occupy two "UTF-16 Characters"

This example is taken from the Mac Character Viewer:
𐅐
GREEK ACROPHONIC ATTIC TEN STATERS
Unicode: U+10150 (U+D800 U+DD50), UTF-8: F0 90 85 90

This worked for me (using LiveCode 5.5.3):

on mouseUp
   set the useUnicode to true
   set the unicodeText of fld "f1" to numToChar(55296) & numToChar(56656)
end mouseUp

Hope this helps.

Peter



On 13 Dec 2012, at 04:53, Richmond wrote:

> So there I am wondering about the higher plains (the svarga-lokas . . . LOL), so I try
> this:
> 
> I make a stack with 2 buttons (called 'button 1' and 'button 2' respectively)
> and 2 fields (called 'f1' and 'f2' repectively) and put the following code into button 1:
> 
> on mouseUp
>  set the useUnicode to true
>  set the unicodeText of fld "f1" to numToChar(65940)
> end mouseUp
> 
> and when I click on the button I get nothing like anything that should appear (a capital X with a bar through its middle),
> but something that resembles a badly deformed Hebrew 'Ain'.
> 
> in button 2 I put the following script:
> 
> on mouseUp
>  set the useUnicode to true
>  put charToNum(fld"f1") into fld "f2"
> end mouseUp
> 
> and get "404", which is, indeed a sort of funny 'Ain'.
> 
> This would seem to suggest 2 things:
> 
> 1. RR/LC cannot cope with Unicode addresses above the first plane.
> 
> 2. RR/LC copes with this by truncating the addresses.
> 
> Does anybody know of a work around for this?
> 
> [this does not affect my work directly, but does interest me both in terms of future work, and
> relating to the capabilities of RR/LC in general]
> 
> Richmond.
> 
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