show-paren-data-function

show-paren-data-function is a variable defined in `paren.el'.
Its value is

show-paren--default

• This variable may be risky if used as a file-local variable.

Documentation:
Function to find the opener/closer "near" point and its match.
The function is called with no argument and should return either nil
if there's no opener/closer near point, or a list of the form
(HERE-BEG HERE-END THERE-BEG THERE-END MISMATCH)
Where HERE-BEG..HERE-END is expected to be near point.