token

type File struct {
	Name  string // absolute path
	Base  int
	Lines []Pos // index is line number - 1. value is the position of the start of each line
	Size  int
}

type FileSet struct {
	Base  int
	Files []*File
}

type Pos int

type Position struct {
	Filename string // filename, if any
	Offset   int    // offset, starting at 0
	Line     int    // line number, starting at 1
	Column   int    // column number, starting at 1 (byte count)
}

type Token string