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

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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