nl_tokens: Processes tree node .
pl_tokens: function ( ast ) { let value = this . <mask> ; ast . traverseByType ( 'number' , function ( number ) { if ( ! value ) { number . content = number . content . replace ( / ^0+(?=\.) / , '' ) ; } else if ( number . content [ 0 ] === '.' ) { number . content = '0' + number . content ; } } ) ; }