afl-material: progs/app6.scala@505472b270eb (annotated)

422 5deefcc8cffa updated programs Christian Urban <urbanc@in.tum.de> parents: 412 diff changeset	1	def simp(r: Rexp) : Rexp = r match {
262 ee4304bc6350 updated handouts Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 117 diff changeset	2	case ALT(r1, r2) => {
343 539b2e88f5b9 updated Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 262 diff changeset	3	(simp(r1), simp(r2)) match {
399 5c1fbb39c93e updated Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 343 diff changeset	4	case (ZERO, r2s) => r2s
5c1fbb39c93e updated Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 343 diff changeset	5	case (r1s, ZERO) => r1s
412 1cef3924f7a2 updated Christian Urban <urbanc@in.tum.de> parents: 399 diff changeset	6	case (r1s, r2s) =>
1cef3924f7a2 updated Christian Urban <urbanc@in.tum.de> parents: 399 diff changeset	7	if (r1s == r2s) r1s else ALT(r1s, r2s)
262 ee4304bc6350 updated handouts Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 117 diff changeset	8	}
ee4304bc6350 updated handouts Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 117 diff changeset	9	}
ee4304bc6350 updated handouts Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 117 diff changeset	10	case SEQ(r1, r2) => {
343 539b2e88f5b9 updated Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 262 diff changeset	11	(simp(r1), simp(r2)) match {
399 5c1fbb39c93e updated Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 343 diff changeset	12	case (ZERO, _) => ZERO
5c1fbb39c93e updated Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 343 diff changeset	13	case (_, ZERO) => ZERO
5c1fbb39c93e updated Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 343 diff changeset	14	case (ONE, r2s) => r2s
5c1fbb39c93e updated Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 343 diff changeset	15	case (r1s, ONE) => r1s
343 539b2e88f5b9 updated Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 262 diff changeset	16	case (r1s, r2s) => SEQ(r1s, r2s)
262 ee4304bc6350 updated handouts Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 117 diff changeset	17	}
ee4304bc6350 updated handouts Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 117 diff changeset	18	}
ee4304bc6350 updated handouts Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 117 diff changeset	19	case r => r
7 73cf4406b773 updated Christian Urban <urbanc@in.tum.de> parents: diff changeset	20	}
73cf4406b773 updated Christian Urban <urbanc@in.tum.de> parents: diff changeset	21
412 1cef3924f7a2 updated Christian Urban <urbanc@in.tum.de> parents: 399 diff changeset	22	def ders(s: List[Char], r: Rexp) : Rexp = s match {
117 25999de692b2 added slides Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 93 diff changeset	23	case Nil => r
435 e08431a78f66 updated Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 422 diff changeset	24	case c::s => ders(s, simp(der(c, r))) /@\label{simpline}@/
117 25999de692b2 added slides Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 93 diff changeset	25	}
25999de692b2 added slides Christian Urban <christian dot urban at kcl dot ac dot uk> parents: 93 diff changeset	26

author	Christian Urban <christian.urban@kcl.ac.uk>
	Sun, 09 Oct 2022 21:39:08 +0100
changeset 883	505472b270eb
parent 565	9c4b9bda974c
permissions	-rw-r--r--