The Free On-line Dictionary of Computing (19 January 2023):

Attribute Translation System
ATS

    (ATS) A BNF-based parser generator from
   the University of Saskatchewan(?).  ATS generates
   table-driven LL1 parsers with full insert-only error
   recovery.  It also has full left-attribute semantic handling,
   which is a dream compared to using YACC's parser actions.

   (2000-04-08)