Mercurial Mercurial > hg > afl-material / annotate
summary | shortlog | changelog | graph | tags | bookmarks | branches | files | changeset | file | latest | revisions | annotate | diff | comparison | raw | help
Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
progs/app06.scala
author Christian Urban <christian.urban@kcl.ac.uk>
Sun, 29 Oct 2023 00:06:30 +0100
changeset 947 dc31a099dc98
parent 788 3b1136fb6bee
permissions -rw-r--r--
updated
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
446
16742bf62365 updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff changeset 
     1
 
def simp(r: Rexp): (Rexp, Val => Val) = r match {
16742bf62365 updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff changeset 
     2
 
  case SEQ(r1, r2) => {
16742bf62365 updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff changeset 
     3
 
    val (r1s, f1s) = simp(r1)
16742bf62365 updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff changeset 
     4
 
    val (r2s, f2s) = simp(r2)
16742bf62365 updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff changeset 
     5
 
    (r1s, r2s) match {
453
36e5752fa191 updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents: 446
diff changeset 
     6
 
      case (ZERO, _) => (ZERO, F_ERROR)
36e5752fa191 updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents: 446
diff changeset 
     7
 
      case (_, ZERO) => (ZERO, F_ERROR)
788
3b1136fb6bee updated
Christian Urban <christian.urban@kcl.ac.uk>
parents: 453
diff changeset 
     8
 
      case (ONE, _) => (r2s, F_SEQ_Empty1(f1s, f2s))
3b1136fb6bee updated
Christian Urban <christian.urban@kcl.ac.uk>
parents: 453
diff changeset 
     9
 
      case (_, ONE) => (r1s, F_SEQ_Empty2(f1s, f2s))
446
16742bf62365 updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff changeset 
    10
 
      case _ => (SEQ(r1s,r2s), F_SEQ(f1s, f2s))
16742bf62365 updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff changeset 
    11
 
    }
16742bf62365 updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff changeset 
    12
 
  }
788
3b1136fb6bee updated
Christian Urban <christian.urban@kcl.ac.uk>
parents: 453
diff changeset 
    13
 
  ...}
3b1136fb6bee updated
Christian Urban <christian.urban@kcl.ac.uk>
parents: 453
diff changeset 
    14
 
def F_SEQ_Empty1(f1: Val => Val, f2: Val => Val) =
3b1136fb6bee updated
Christian Urban <christian.urban@kcl.ac.uk>
parents: 453
diff changeset 
    15
 
  (v:Val) => Sequ(f1(Empty), f2(v))
3b1136fb6bee updated
Christian Urban <christian.urban@kcl.ac.uk>
parents: 453
diff changeset 
    16
 
def F_SEQ_Empty2(f1: Val => Val, f2: Val => Val) =
3b1136fb6bee updated
Christian Urban <christian.urban@kcl.ac.uk>
parents: 453
diff changeset 
    17
 
  (v:Val) => Sequ(f1(v), f2(Empty))
446
16742bf62365 updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff changeset 
    18
 
def F_SEQ(f1: Val => Val, f2: Val => Val) =
16742bf62365 updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff changeset 
    19
 
  (v:Val) => v match {
16742bf62365 updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff changeset 
    20
 
    case Sequ(v1, v2) => Sequ(f1(v1), f2(v2)) }
afl-material