nl_tokens: Return a function to turn a file object into a JSON - like data object
pl_tokens: function chooseDataSource ( dataSource ) { if ( dataSource === 'json' ) { return function ( file ) { return JSON . parse ( file . contents . toString ( ) ) ; } ; } else if ( dataSource === 'vinyl' ) { return function ( file ) { file [ bodyAttribute ] = file . contents . toString ( ) ; return file ; } ; } else if ( dataSource === 'data' ) { return function ( file ) { var <mask> = file . data ; data [ bodyAttribute ] = file . contents . toString ( ) ; return data ; } ; } else if ( typeof dataSource === 'function' ) { return dataSource ; } else { throw pluginError ( 'Unknown dataSource' ) ; } }