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The -r is unnecessary and dangerous, especially as the script may be run with the current directory other than its own directory, perhaps a directory that has a subdirectory called script. Here's a command prompt session illustrating the danger:
c@CW8:/tmp$ mkdir -p a/b/c
c@CW8:/tmp$ touch a/x a/b/y a/b/c/z
c@CW8:/tmp$ tree a
| |-- c
| | `-- z
| `-- y
2 directories, 3 files
c@CW8:/tmp$ rm -r a
c@CW8:/tmp$ ls -l a
ls: cannot access a: No such file or directory
BTW, a running shell script is not always able to determine the file that contains the code it is running for reasons explained here.