The column multi_line is updated (after the line break information is
modified) and the rest of the transformers are applied afterwards,
The former requires two pre visits and one post visit.
apply_transformers(pd_nested, transformers)A nested parse table.
A list of named transformer functions
The order of the transformations is:
Initialization (must be first).
Line breaks (must be before spacing due to indention).
Update of newline and multi-line attributes (must not change afterwards, hence line breaks must be modified first).
spacing rules (must be after line-breaks and updating newlines and multi-line).
indention.
token manipulation / replacement (is last since adding and removing tokens will invalidate columns token_after and token_before).
Update indention reference (must be after line breaks).