find_tokens_to_update: Find the tokens to update when applying a reference indention
Description
Given a target token and a flattened parse table, the token for which the
spacing information needs to be updated are computed. Since indention is
already embedded in the column lag_spaces, only tokens at the beginning of
a line are of concern.
Usage
find_tokens_to_update(flattened_pd, target_token)
Arguments
flattened_pd
A flattened parse table.
target_token
The index of the token from which the indention level
should be applied to other tokens.