Idea: Allow for negative indices in argument and sub- indices to allow for pythoninc interface to picking up items from the end

[mpourmpoulis]

[mpourmpoulis]

This idea has been on my mind for quite a while but will require little bit of code on the grammar side because the IntegerRef Does not support negative integers.

as for the spoken form, Probably something like

argument minus one

Be appropriate

[mpourmpoulis]

This is now possible for argument queries and subindexing In nondedicated queries

You can say something like argument minus 1 to pick the last argument

This can be achieved by changing IntegerRefST with a specially crafted dragonfly compound

def positive_negative_integer(name,value):
    return Compound(
    name=name,
    spec="([<minus>] <i>)",
    extras = [IntegerRefST("i",0,value),Choice("minus",{"minus":-1},default=1)],
    value_func = lambda node,extras: extras["minus"]*extras["i"],

)