package go/token
Pos returns the Pos value for the given file offset; the offset must be <= f.Size(). f.Pos(f.Offset(p)) == p.
Golang go/token.File.Pos function usage examples
Example 1:
if 0 <= startOffset && startOffset <= file.Size() {
start = file.Pos(int(startOffset))
} else {
err = fmt.Errorf("start position is beyond end of file")
return
}
Example 2:
func getPos(filename string, offset int) token.Pos {
if f := getFile(filename); f != nil {
return f.Pos(offset)
}
return token.NoPos
}
Reference :
http://golang.org/pkg/go/token/#File.Pos
