Google Summer of Code 2014 Test Implementation

[RomanTsegelskyi]

Hi,
I've implemented an S3 method for CrossTable object as a test task for GSoC2014.
It looks like it follows the standard, I will ask some questions in private e-mail.

[daroczig]

Thanks, Roman. That's fine for now, please come come up with a proposal on GSoC Melange before continuing with coding here.

[daroczig]

Oh, and before I forget: the percentages in the "Total" column shouldn't rather end up in the col% rows?

[RomanTsegelskyi]

I've added support for keeping line breaks inside cells and added keep.line.breaks param with proper explanations. Also I've implemented S3 method for CrossTable, after figuring out how to work with line breaks.

[daroczig]

Great, thanks!

I had some hard time while realizing why split.line was only called with CJK characters :) Could you please add a comment there for future reference that \n has no width or similar? So that a cell with line-breaks behaves like CJK chars from a practical point of view.

And could you please verify if this is the expected result:

> library(descr)
> library(pander)
> library(rapport)
> pander(CrossTable(ius2008$gender, ius2008$dwell))

------------------------------------------------
       city   small town   village   Total 
---------- ------ ------------ --------- -------
 **male**                                       
    N       338        28         19       385  
 Row (%)    88%        7%         5%       54%  
Column (%)  59%       90%         68%           
            54%        4%         3%            

**female**                                      
    N       234        3           9       246  
 Row (%)    95%        1%         4%       35%  
Column (%)  41%       10%         32%           
            37%        0%         1%            

  Total     572        31         28       709  
            81%        4%         4%            
------------------------------------------------

Pandoc does not keep the line breaks in the cells -- only if ""A backslash followed by a newline is also a hard line break. Note: in multiline and grid table cells, this is the only way to create a hard line break, since trailing spaces in the cells are ignored." (Pandoc manual)

This means that we have to "escape" (with a backslash) the line-breaks inside of the cells, otherwise those are deleted by Pandoc. Well, this POC test of the GSoC application is more complex than I thought before, sorry for that.

Can you address this issue? And please feel free to ping me at any time.

[RomanTsegelskyi]

I've added artificial backslash symbols and fixed correct count of total. Now the example calculates and renderes correctly.
One issue, I've noticed. This implementetation will not allow simple or Rmarkdown style, because it uses line breaks inside strings and forces to keep them.
I think that this was actually a nice task for me to start with, I had to debug line by line pandoc.table to understand everything for implementation of CrossTable, so I got more understanding I think.

[daroczig]

Great, thank you very mcuh! Well, simple and Rmarkdown table styles do not support line breaks, but we cannot help that.