Maps a position of the cursor (point) to the corresponding token of type 'a in a given text editor with a .lp file open.

The empty range map.

find pt map returns the only (token, range) couple in map such that pt is a point within the mapped interval range. Requires map to be well-defined (see add).

add range token map adds a mapping (key : range, value : token) to map.

Requires all added keys to be non overlapping intervals to be well-defined. /!\ Does not ensure proper functionning if the added keys are overlapping intervals, e.g might change a previously added (key, element) couple or throw an error.