core

type Change struct {
	// The position at which the change was made.
	Position int64

	// The number of bytes that were removed at the position.
	Removed int64

	// The data inserted at the position. If longer than Removed, the extra
	// bytes will replace the bytes at Position + Removed.
	Data []byte
}

type EditorBuffer struct {
	// The name of the buffer. If the buffer is a file, this is the full path to
	// the file. If the buffer is not a file, this can be any string.
	Name string

	// The current cursor position.
	Cursor int64

	// The current selection start position. If there is no selection, this is
	// equal to Cursor.
	SelectionStart int64

	// The underlying buffer containing the actual data.
	Buffer io.ReadSeeker

	// Clipboard holds the current clipboard contents.
	Clipboard []byte

	// The undo stack. When changes are made to the buffer, they are pushed
	// here. This stack serves as the source of truth for the buffer's contents.
	UndoStack []Change

	// The redo stack. When undoing changes, they are popped from the undo stack
	// and pushed here.
	RedoStack []Change

	// Preview is a Change that is currently being edited. Once the user commits
	// the change, it will be pushed onto the UndoStack.
	Preview *Change

	// Regions is a list of user-defined regions in the buffer. This does not
	// include the selection and other internal regions.
	Regions []Region
}

type IndexedRange struct {
	Index int
	Range
}

type Range struct {
	Start int64
	End   int64
}

type Region struct {
	Type RegionType
	Range
}

type RegionType int