| author | Christian Urban <christian.urban@kcl.ac.uk> | 
| Thu, 29 Sep 2022 21:10:45 +0100 | |
| changeset 877 | a8a4ca890f56 | 
| parent 399 | 5c1fbb39c93e | 
| permissions | -rw-r--r-- | 
| 
399
 
5c1fbb39c93e
updated
 
Christian Urban <christian dot urban at kcl dot ac dot uk> 
parents: 
261 
diff
changeset
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1  | 
def OPT(r: Rexp) = ALT(r, ONE)  | 
| 7 | 2  | 
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261
 
24531cfaa36a
updated handouts
 
Christian Urban <christian dot urban at kcl dot ac dot uk> 
parents: 
93 
diff
changeset
 | 
3  | 
def NTIMES(r: Rexp, n: Int) : Rexp = n match {
 | 
| 
399
 
5c1fbb39c93e
updated
 
Christian Urban <christian dot urban at kcl dot ac dot uk> 
parents: 
261 
diff
changeset
 | 
4  | 
case 0 => ONE  | 
| 
261
 
24531cfaa36a
updated handouts
 
Christian Urban <christian dot urban at kcl dot ac dot uk> 
parents: 
93 
diff
changeset
 | 
5  | 
case 1 => r  | 
| 
 
24531cfaa36a
updated handouts
 
Christian Urban <christian dot urban at kcl dot ac dot uk> 
parents: 
93 
diff
changeset
 | 
6  | 
case n => SEQ(r, NTIMES(r, n - 1))  | 
| 
 
24531cfaa36a
updated handouts
 
Christian Urban <christian dot urban at kcl dot ac dot uk> 
parents: 
93 
diff
changeset
 | 
7  | 
}  | 
| 
 
24531cfaa36a
updated handouts
 
Christian Urban <christian dot urban at kcl dot ac dot uk> 
parents: 
93 
diff
changeset
 | 
8  |