[fpc-devel] Unicode RTL

Yury Sidorov jura at ce.blagovest.com
Thu Nov 17 15:12:30 CET 2005

----- Original Message ----- 
From: "Felipe Monteiro de Carvalho" <felipemonteiro.carvalho at gmail.com>

> On 11/17/05, Mattias Gaertner <nc-gaertnma at netcologne.de> wrote:
> > Speaking for lazarus: we want to support the whole unicode and UTF8 is 
> > the
> > easiest to achieve that.
> I particulary like this solution.
> * It doesn´t break existing code
> * It makes it easy to make a program unicode. Just change the encoding to 
> utf-8!
> * It includes no overhead to existing apps
> Only a few RTL functions would have to be created to support utf-8, as
> has being said here. Many functions could remain the same.
> The programer should know what he is using and take the necessary
> precautions (use special utf-8 function for example, if needed)

I think RTL functions can use UTF-8 stored in regular ansistrings. But 
string type name must be different from String or AnsiString. It must be 
named like Utf8String or StringUtf8 to specify that the function or 
procedure is UTF-8 aware.

Also conversion between WideString and Utf8String need to be transparent 
(automatic UTF-16 (UCS-2) <-> UTF-8 conversion).

This will allow to assing Utf8String to WideString and perform indexing or 
per character operations easily if needed. Also developer can work only with 
WideStrings in his application and pass them to functions that accept 
Utf8String and that will work good (in non time critical places of code of 

Yury Sidorov. 

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