nl_tokens: Computed all expression and get concated result
pl_tokens: function compute ( ) { // set value util . forEach ( expressions , function ( exp , <mask> ) { var v = that . $exec ( exp ) if ( ! v [ 0 ] ) caches [ index ] = v [ 1 ] } ) // get content var str = '' util . forEach ( parts , function ( item , index ) { str += emptyStr ( item ) if ( index < expressions . length ) { str += emptyStr ( caches [ index ] ) } } ) return Expression . unveil ( str ) }