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| − | = Irrelevant stuff - looks like a wish list =
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| − | Removed this from the main page as it will only give cause for confusion.
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| − | Developers agree it is useless: http://www.mail-archive.com/fpc-devel@lists.freepascal.org/msg30196.html
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| − | IMO this can be deleted from this page as well.
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| − | Thanks,
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| − | --[[User:BigChimp|BigChimp]] 16:08, 7 January 2014 (CET)
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| − |
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| − | == FPC Unicode support ==
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| − |
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| − | FPC must have the following string types with transparent conversion between them (like current AnsiString <-> WideString conversion):
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| − |
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| − | * shortstring
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| − | * ansistring
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| − | * widestring
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| − | * utf8string
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| − | * utf16string
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| − | * utf32string
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| − | * ucs2string (?)
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| − | * ucs4string (?)
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| − |
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| − | '''Development and further maintenance of these string types must be as simple as possible.''' New string types must be easily added in future if needed.
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| − | Compiler uses generic structure and helper routines to handle all refcounted string types.
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| − | String header:
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| − | <syntaxhighlight>
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| − | type
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| − | TRefStringRec = packed record
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| − | Encoding: word; // encoding of string
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| − | ElementSize: byte; // size in bytes of string's element (1-4)
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| − | Ref: SizeInt; // number of references
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| − | Len: SizeInt; // number of elements is string
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| − | end;
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| − | </syntaxhighlight>
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| − |
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| − | Helper routines will know how to handle string from its header.
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| − | Extra parameter with string type information is passed to some routines (like fpc_RefString_SetLength) to allow properly initialize new strings.
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| − |
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| − | widestring type on Windows targets remains non-refcounted and OLE compatible. Minimal number of helper routines is used for it. On non-Windows targets widestring is alias to utf16string.
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| − |
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| − | The compiler uses helpers for string type conversions like this:
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| − | <syntaxhighlight>
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| − | procedure fpc_ansistring_to_utf16string(out dst: utf16string; const src: ansistring);
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| − | procedure fpc_utf32string_to_utf16string(out dst: utf16string; const src: utf32string);
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| − | </syntaxhighlight>
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| − | The compiler generates helper procedure name from type names. The compiler does not perform any string conversion handling by itself.
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