nl_tokens: Reads the resource container info without opening it . This will however work on containers that are both open and closed .
pl_tokens: function inspectContainer ( container_path , opts ) { return new Promise ( function ( resolve , reject ) { if ( path . extname ( container_path ) !== '.' + <mask> . file_ext ) { reject ( new Error ( 'Invalid resource container file extension' ) ) ; return ; } try { resolve ( fs . statSync ( container_path ) . isFile ( ) ) ; } catch ( err ) { reject ( new Error ( 'The resource container does not exist at' , container_path ) ) ; } } ) . then ( function ( isFile ) { if ( isFile ) { // TODO: For now we are just opening the container then closing it. // Eventually it would be nice if we can inspect the archive without extracting everything. let containerDir = path . join ( path . dirname ( container_path ) , path . basename ( container_path , '.' + spec . file_ext ) ) ; return openContainer ( container_path , containerDir , opts ) . then ( function ( container ) { return closeContainer ( containerDir , opts ) . then ( function ( ) { return Promise . resolve ( container . info ) ; } ) ; } ) ; } else { loadContainer ( container_path ) . then ( function ( container ) { return Promise . resolve ( container . info ) ; } ) ; } } ) ; }