Re: [www-devel] PATCH librevenge: Add support for custom formatting

This would change the ABI of librevenge. For a little use. Your library
can do the formatting of the number and push it then as a string.
Instead of adding a function pointer to the virtual class' Vtable.

Cheers

F.

On 03/07/2019 16:30, Bartosz wrote:
> Hello,
>
> My name is Bartosz, and I'm LibreOffice developer, which mostly working on EMF+, xls, xlsx, docx 
> import/export features:
> https://wiki.documentfoundation.org/User:Gang65
>
> I have started improving Visio import, for example with Pull Request:
> https://gerrit.libreoffice.org/#/c/74743/14
>
> To fix next Visio issues I need to improve librevenge library first:
>
> The RVNGDoubleProperty property is supporting one format conversion to
> string. It is "%.4f". It print as a floating point with a precision
> of four characters after the decimal point.
>  
> Example:
>  Number: 3.14 will be converted to string "3.1400"
>  
> In some libraries (libvisio), there is a need to convert double
> type property to different formats.
>  
> For example with different precision after decimal point, or without
> trailing zeros:
> Example:
>  - 3.14    (format:  "%.3g"
>  - 3.140 (format:  "%.3f"
>  
> This patch adds new method to RVNGProperty:
>    virtual RVNGString getStr(const char* format) const;
>  
> It allows to change default string format of every property:
> https://pastebin.com/GTruzDS3
>
> Thanks in advance 
> Bartosz



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