docs: Remove table, xml and primitive

[gaocegege]

Close #120

Signed-off-by: Ce Gao ce.gao@outlook.com

[jeremydouglass]

Question: the Table and XML classes and all of their methods are part of the Java API -- those classes are not Python mode-specific features, although I am not sure if Python mode implements the same methods those methods in the same way.

• https://processing.org/reference/Table.html
• https://processing.org/reference/XML.html

Why are they being removed? Is the idea that R has its own built-in methods for doing table manipulation, like using matrices?

Python documentation that does not belong in in R include core features of the Python language that are not part of the Processing Java API. These were included in the Python mode documentation but should not be in included in the R mode documentation. An example is dict -- dictionaries are a Python built-in that do not exist in Processing(Java), and also do not exist in R.

If you want to know whether a Python reference maps to the Java API you can compare the reference pages:

• https://processing.org/reference/
• http://py.processing.org/reference/

[gaocegege]

I remove this functions since R has a better support for table(matrix), and as for XML, I don't think it is necessary for R mode since I can't imagine the use scenarios. 🤔 Do you think if we need to add XML back?

[jeremydouglass]

Thinking about this more:

Table and XML are quite complex, and should be low priority in documentation. If there are implementation issues (e.g. if the load and save functions don't "just work") then they should also be low priority.

1. Table: I agree that it would be very strange to use the Java API Table in an R sketch. If it turns out we are wrong I suppose it could be restored in a way that avoids collision or confusion between the R and Java modes. Fine to just take Table out.

2. XML: Is it still available in the imported Java processing$ namespace? That might be the best approach -- leave it as automatically available, but undocumented (unless it conflicts with something, or is broken, or required complex mapping to make it available -- it is low priority).

For an R mode user who wants to work with XML, right now the default R package for XML is not available in renjin because it is C-based:

• http://packages.renjin.org/package/org.renjin.cran/XML

...although if our R packing importing is fully resolved, native R XML features might be available through XiMpLe:

• http://packages.renjin.org/package/org.renjin.cran/XiMpLe