Double-Value Unicode?

Dar Scott dsc at swcp.com
Sun May 18 00:33:53 EDT 2014


Yes, 65535 is the upper limit for characters that don’t need surrogate pairs.  (Technically, 65535 and 65534 are not characters, but ignoring that, it is 16 bits.)



On May 17, 2014, at 11:54 AM, Scott Rossi <scott at tactilemedia.com> wrote:

> Maybe unnecessary for LC7, but for my work in LC6 (and anybody that's
> interested), I put together the following functions for converting a
> unicode surrogate pair to a single value and vice versa:
> 
> function unicodePairToNum pNum1,pNum2
>    return (pNum1 - 55296) * 1024 + (pNum2 - 56320) + 65536
> end unicodePairToNum
> 
> function numToUnicodePair pNum
>   put trunc((pNum - 65536)/1024 + 55296) into num1
>   put (pNum - 65536) mod 1024 + 56320 into num2
>   return num1,num2
> end numToUnicodePair
> 
> 
> 
> Thanks to Richmond for the link to unicode character calculations:
> http://www.russellcottrell.com/greek/utilities/SurrogatePairCalculator.htm
> 
> 
> 
> One item that would be helpful to know is at what value does a unicode
> character start being represented as pairs?  Is 65536 the upper limit for
> single value characters?
> 
> 
> Thanks & Regards,
> 
> Scott Rossi
> Creative Director
> Tactile Media, UX/UI Design
> 
> 
> 
> 
> On 5/16/14 4:58 PM, "Scott Rossi" <scott at tactilemedia.com> wrote:
> 
>> Hi All:
>> 
>> I thought I had figured out the display of Unicode glyphs in LC 6.6, and
>> then ran up against a threshold where the value of a character is
>> displayed as two values.  I'm guessing this is related to a "double-byte"
>> something or other.  How does one retrieve the value of a character as a
>> single value?
>> 
>> For example, I can set the htmlText of a field to 📞 and get the
>> correct unicode character to display.  But when retrieving the value for
>> the character, I get: ��
>> 
>> Can I encode/decode/jumpcode/flipcode something here to get a single
>> value 
>> representation of the character?
>> 
>> (Also, I'm unable set the value of the by setting the unicodeText to
>> numToChar(128222) -- only using the htmlText property seems to work).
>> 
>> 
>> Thanks for helping out this uniclueless dude.
>> 
>> Regards,
>> 
>> Scott Rossi
>> Creative Director
>> Tactile Media, UX/UI Design
>> 
> 
> 
> 
> _______________________________________________
> use-livecode mailing list
> use-livecode at lists.runrev.com
> Please visit this url to subscribe, unsubscribe and manage your subscription preferences:
> http://lists.runrev.com/mailman/listinfo/use-livecode





More information about the Use-livecode mailing list