fileformat

type FileFormat interface {
	// ValidateSchema validates the file format specific portion of the schema and returns
	// any needed runtime data that can be used in later constructed FormatReader. If this
	// file format isn't a match for the one specified by 'format' argument, it must return
	// errs.ErrSchemaNotSupported. All other errs must be ctx aware formatted.
	ValidateSchema(format string, schemaContent []byte, finalOutputDecl *transform.Decl) (interface{}, error)

	// CreateFormatReader creates an FormatReader which reads records of input data for this file format.
	CreateFormatReader(
		inputName string, input io.Reader, formatRuntime interface{}) (FormatReader, error)
}

type FormatReader interface {
	// Read returns a *Node and its subtree that will eventually be parsed and transformed into an
	// output record. If EOF has been reached, io.EOF must be returned.
	Read() (*idr.Node, error)
	// Release gives the reader a chance to free resources of the *Node and its subtree that it returned
	// to caller in a previous Read() call.
	Release(*idr.Node)
	// IsContinuableError determines whether an FormatReader returned error is continuable or not.
	// For certain errors (like EOF or corruption) there is no point to keep on trying; while others
	// can be safely ignored.
	IsContinuableError(err error) bool
	// FormatReader must be able to format an error by providing context information (such as input
	// file name and (approx.) error location, such as line number)
	errs.CtxAwareErr
}