font-FiraCode/features/calt/equal_arrows.fea

lookup equal_arrows {
  # Disable |||
  ignore sub bar bar' bar equal;
  ignore sub bar bar' equal;
  ignore sub [equal_start.seq equal_middle.seq] bar' bar bar;

  # equal middle & end
  sub [less_equal_start.seq less_less_equal_start.seq less_equal_middle.seq less_less_equal_middle.seq greater_equal_start.seq greater_greater_equal_start.seq greater_equal_middle.seq greater_greater_equal_middle.seq bar_equal_start.seq bar_bar_equal_start.seq bar_equal_middle.seq bar_bar_equal_middle.seq slash_equal_start.seq slash_slash_equal_start.seq slash_equal_middle.seq slash_slash_equal_middle.seq colon_equal_middle.seq exclam_equal_middle.seq equal_start.seq equal_middle.seq] equal' [equal less greater bar slash colon exclam] by equal_middle.seq;

  sub [less_equal_start.seq less_less_equal_start.seq less_equal_middle.seq less_less_equal_middle.seq greater_equal_start.seq greater_greater_equal_start.seq greater_equal_middle.seq greater_greater_equal_middle.seq bar_equal_start.seq bar_bar_equal_start.seq bar_equal_middle.seq bar_bar_equal_middle.seq slash_equal_start.seq slash_slash_equal_start.seq slash_equal_middle.seq slash_slash_equal_middle.seq colon_equal_middle.seq exclam_equal_middle.seq equal_start.seq equal_middle.seq] equal' by equal_end.seq;

  # double middles
  sub [equal_start.seq equal_middle.seq] less.spacer    less'    equal by less_less_equal_middle.seq;
  sub [equal_start.seq equal_middle.seq] less'          less     equal by less.spacer;
  sub [equal_start.seq equal_middle.seq] greater.spacer greater' equal by greater_greater_equal_middle.seq;
  sub [equal_start.seq equal_middle.seq] greater'       greater  equal by greater.spacer;
  sub [equal_start.seq equal_middle.seq] bar.spacer     bar'     equal by bar_bar_equal_middle.seq;
  sub [equal_start.seq equal_middle.seq] bar'           bar      equal by bar.spacer;
  sub [equal_start.seq equal_middle.seq] slash.spacer   slash'   equal by slash_slash_equal_middle.seq;
  sub [equal_start.seq equal_middle.seq] slash'         slash    equal by slash.spacer;

  # single middles
  sub [equal_start.seq equal_middle.seq] less'    equal by less_equal_middle.seq;
  sub [equal_start.seq equal_middle.seq] greater' equal by greater_equal_middle.seq;
  sub [equal_start.seq equal_middle.seq] bar'     equal by bar_equal_middle.seq;
  sub [equal_start.seq equal_middle.seq] slash'   equal by slash_equal_middle.seq;
  sub [equal_start.seq equal_middle.seq] colon'   equal by colon_equal_middle.seq;
  sub [equal_start.seq equal_middle.seq] exclam'  equal by exclam_equal_middle.seq;

  # double ends
  sub [equal_start.seq equal_middle.seq] less.spacer    less'    by less_less_equal_end.seq;
  sub [equal_start.seq equal_middle.seq] less'          less     by less.spacer;
  sub [equal_start.seq equal_middle.seq] greater.spacer greater' by greater_greater_equal_end.seq;
  sub [equal_start.seq equal_middle.seq] greater'       greater  by greater.spacer;
  sub [equal_start.seq equal_middle.seq] bar.spacer     bar'     by bar_bar_equal_end.seq;
  sub [equal_start.seq equal_middle.seq] bar'           bar      by bar.spacer;
  sub [equal_start.seq equal_middle.seq] slash.spacer   slash'   by slash_slash_equal_end.seq;
  sub [equal_start.seq equal_middle.seq] slash'         slash    by slash.spacer;

  # single ends
  sub [equal_start.seq equal_middle.seq] less'    by less_equal_end.seq;
  sub [equal_start.seq equal_middle.seq] greater' by greater_equal_end.seq;
  sub [equal_start.seq equal_middle.seq] bar'     by bar_equal_end.seq;
  sub [equal_start.seq equal_middle.seq] slash'   by slash_equal_end.seq;

  # double beginnings
  sub less.spacer    less'    equal by less_less_equal_start.seq;
  sub less'          less     equal by less.spacer;
  sub greater.spacer greater' equal by greater_greater_equal_start.seq;
  sub greater'       greater  equal by greater.spacer;
  sub bar.spacer     bar'     equal by bar_bar_equal_start.seq;
  sub bar'           bar      equal by bar.spacer;
  sub slash.spacer   slash'   equal by slash_slash_equal_start.seq;
  sub slash'         slash    equal by slash.spacer;

  # Disable >=< #548
  sub greater' equal less [equal less] by greater_equal_start.seq;
  ignore sub greater' equal less;
  
  # Disable =< #479 #468 #424 #406 #355 #305
  sub equal' less [equal less] by equal_start.seq;

  # Disable =/ #1056
  sub equal'   slash [equal slash] by equal_start.seq; 

  # single beginnings
  sub less'    equal by less_equal_start.seq;
  sub greater' equal by greater_equal_start.seq;
  sub bar'     equal [equal less greater bar colon exclam slash] by bar_equal_start.seq; # disable |= 
  sub slash'   equal by slash_equal_start.seq;
  sub equal'  [equal greater bar colon exclam] by equal_start.seq;

} equal_arrows;