nl_tokens: Detects the value of an option at the tree node .
pl_tokens: function ( ast ) { let detected = [ ] ; ast . traverse ( function ( <mask> ) { if ( ! node . is ( 'block' ) && ! node . is ( 'atrulers' ) ) return ; if ( node . first ( ) . is ( 'space' ) ) { detected . push ( node . first ( ) . content ) ; } else { detected . push ( '' ) ; } } ) ; return detected ; }