fixedlength

type ByHeaderFooterDecl struct {
	Header string `json:"header"`
	Footer string `json:"footer"`
}

type ColumnDecl struct {
	Name        string  `json:"name"`
	StartPos    int     `json:"start_pos"` // 1-based. and rune-based.
	Length      int     `json:"length"`    // rune-based length.
	LinePattern *string `json:"line_pattern"`
}

type EnvelopeDecl struct {
	Name           *string             `json:"name"`
	ByHeaderFooter *ByHeaderFooterDecl `json:"by_header_footer"`
	ByRows         *int                `json:"by_rows"`
	NotTarget      bool                `json:"not_target"`
	Columns        []*ColumnDecl       `json:"columns"`
}

type ErrInvalidEnvelope string

type FileDecl struct {
	Envelopes []*EnvelopeDecl `json:"envelopes"`
}