nl_tokens: should upload next chunk
pl_tokens: function ( ) { var num = 0 ; var should = true ; var simultaneousUploads = this . opts . simultaneousUploads ; each ( this . files , function ( <mask> ) { each ( file . chunks , function ( chunk ) { if ( chunk . status ( ) === 'uploading' ) { num ++ ; if ( num >= simultaneousUploads ) { should = false ; return false ; } } } ) ; } ) ; // if should is true then return uploading chunks's length return should && num ; }