[fpc-devel] Unicode support - for the 20th time... ;-)

Daniël Mantione daniel.mantione at freepascal.org
Thu Nov 20 11:12:41 CET 2008

Op Thu, 20 Nov 2008, schreef Graeme Geldenhuys:

> On Thu, Nov 20, 2008 at 11:37 AM, Florian Klaempfl
> <florian at freepascal.org> wrote:
>> FPC supports Unicode, in 2.3.x is the UnicodeString type available being a
>> ref. counted utf-16 string on all platforms.
> OK, I'll try to switch fpGUI's TfpgString type to alias UnicodeString
> an see what happens. Obviously this will be done in a separate branch,
> not to screw with Trunk.
> So where can I find out what has been implemented and what is missing?
> Some or other roadmap, like Lazarus has for it's LCL.
>  http://wiki.lazarus.freepascal.org/Roadmap#Status_of_components_on_each_widgetset
> eg:
>  Does 2.3.x with UnicodeString support the following (off the top of my head).
> * TStringList.LoadFromFile() - what happens if file is UTF-8 encoded
> like under Linux.

The file is assumed to be in system encoding (which can be UTF-8). Support 
for reading of other encodings has not been decided on about yet and is 
not part of the initial plan.

> * Does it support > 1byte Locale variables for Currency Delimiter,
> etc.. Russian locale
>   requires a >1 byte char.

It can remain a system encoded ansichar for 100% compatibility, or on 
selected platforms become a widechar. Conversion to multibyte (utf8) can 
in both cases be inferred by the compiler from type information.

> * FindFile, FindFirst? Do they handle Unicode filenames? What about
> other file IO calls.

Win32 widestring platform for sure. Not really decided on non-Unicode 
platforms yet, they may remain in the system encoding. Autoconversion will 
in such case happen based on type information.

> * Copy, Length, Pos etc...?


> * What about usage like:   SomeString[x] := 'A';

String element based.

> * What if we call external API's with string parameters?  XLib,
> OpenGL, Win32 etc?

Auto-conversion based on type information.

> * Does UnicodeString work on all platforms? Linux, Windows for a start?

Yes, but all platforms will get string=unicodestring.


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