Implements a very specific pre-visiting scheme, namely to propagate
indention, spaces and lag_newlines to inner token to terminals. This means
that information regarding indention, line breaks and spaces (which is
relative in pd_nested) will be converted into absolute.
context_to_terminals(pd_nested, outer_lag_newlines, outer_indent, outer_spaces,
outer_indention_refs)A nested parse table.
The lag_newlines to be propagated inwards.
The indention depth to be propagated inwards.
The number of spaces to be propagated inwards.
The reference id that should be propagated inwards.
An updated parse table.
context_towards_terminals visitors