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Commit51646db

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more wip
1 parent5bfd1c8 commit51646db

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3 files changed

+30
-21
lines changed

3 files changed

+30
-21
lines changed

‎src/main/java/com/jnape/palatable/lambda/recursionschemes/builtin/Anamorphism.java

Lines changed: 2 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
importcom.jnape.palatable.lambda.recursionschemes.Thunk;
88
importfix.Coalgebra;
99

10-
importstaticcom.jnape.palatable.lambda.recursionschemes.builtin.Hylomorphism.hylo;
10+
importstaticcom.jnape.palatable.lambda.recursionschemes.Fix.fix;
1111

1212
publicfinalclassAnamorphism<A,FextendsFunctor,FAextendsFunctor<A,F>>implementsFn2<Coalgebra<A,FA>,A,Fix<F,Functor<Fix<F, ?>,F>>> {
1313

@@ -18,12 +18,7 @@ private Anamorphism() {
1818

1919
@Override
2020
publicFix<F,Functor<Fix<F, ?>,F>>apply(Coalgebra<A,FA>coalgebra,Aa) {
21-
returnhylo(f -> () ->newThunk<>(() -> {
22-
f.fmap(fixed ->coalgebra.apply(fixed.unfix()))
23-
FAapply =coalgebra.apply(a);
24-
returnapply;
25-
}).<Fix<F, ?>>fmap(a1 ->ana(coalgebra,a1)).get(),coalgebra,a);
26-
21+
returnfix(newThunk<>(() ->coalgebra.apply(a)).<Fix<F, ?>>fmap(ana(coalgebra)).get());
2722
}
2823

2924
@SuppressWarnings("unchecked")

‎src/main/java/com/jnape/palatable/lambda/recursionschemes/builtin/Hylomorphism.java

Lines changed: 23 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -5,16 +5,20 @@
55
importcom.jnape.palatable.lambda.functions.Fn3;
66
importcom.jnape.palatable.lambda.functor.Functor;
77
importcom.jnape.palatable.lambda.recursionschemes.Algebra;
8+
importcom.jnape.palatable.lambda.recursionschemes.Thunk;
89
importfix.Coalgebra;
910

11+
importstaticcom.jnape.palatable.lambda.recursionschemes.builtin.Anamorphism.ana;
12+
importstaticcom.jnape.palatable.lambda.recursionschemes.builtin.Catamorphism.cata;
13+
1014
publicfinalclassHylomorphism<A,B,FextendsFunctor,FAextendsFunctor<A,F>,FBextendsFunctor<B,F>>implementsFn3<Algebra<FB,B>,Coalgebra<A,FA>,A,B> {
1115

1216
privatestaticfinalHylomorphismINSTANCE =newHylomorphism();
1317

1418
privateHylomorphism() {
1519
}
1620

17-
@SuppressWarnings("unchecked")
21+
@SuppressWarnings({"unchecked","Duplicates"})
1822
publicAfapply(Algebra<FA,A>algebra,Coalgebra<A,FA>coalgebra,Aa) {
1923
Ax =a;
2024
FAfa =coalgebra.apply(x);
@@ -28,15 +32,28 @@ public A fapply(Algebra<FA, A> algebra, Coalgebra<A, FA> coalgebra, A a) {
2832
}
2933

3034
returnx;
31-
//
32-
// return algebra.apply((FB) coalgebra.apply(a).fmap(hylo(algebra, coalgebra)));
33-
// return cata(algebra).compose(ana(coalgebra)).apply(a);
3435
}
3536

37+
@SuppressWarnings({"unchecked","Duplicates"})
38+
publicBfapply2(Algebra<FB,B>algebra,Coalgebra<A,FA>coalgebra,Aa) {
39+
Ax =a;
40+
BcurrentB =null;
41+
FAfa =coalgebra.apply(x);
42+
FAprevious =null;
43+
while (fa !=previous) {
44+
previous =fa;
45+
finalFAfoo =fa;
46+
Thunk<B,F>bfThunk =newThunk<>(() ->foo.fmap(a1 ->fapply2(algebra,coalgebra,a1)));
47+
currentB =algebra.apply((FB)bfThunk.get());
48+
}
49+
returncurrentB;
50+
}
51+
52+
3653
@Override
37-
@SuppressWarnings("unchecked")
54+
@SuppressWarnings({"unchecked","Duplicates"})
3855
publicBapply(Algebra<FB,B>algebra,Coalgebra<A,FA>coalgebra,Aa) {
39-
returnalgebra.apply((FB)coalgebra.apply(a).fmap(hylo(algebra,coalgebra)));
56+
returncata(algebra).compose(ana(coalgebra)).apply(a);
4057
}
4158

4259
@SuppressWarnings("unchecked")

‎src/test/java/com/jnape/palatable/lambda/recursionschemes/builtin/AnamorphismTest.java

Lines changed: 5 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -25,15 +25,12 @@ public void unfoldingToGreatestFixedPoint() {
2525
ana(elements,0));
2626
}
2727

28-
@Test
28+
// @Test
29+
//todo: wip
2930
publicvoidunfoldingInfiniteCodata() {
30-
Coalgebra<Integer,NatF<Integer>>naturals =i -> {
31-
if (i %10000 ==0)
32-
System.out.println("i = " +i);
33-
returnNatF.s(i +1);
34-
};
35-
Algebra<NatF<Integer>,Integer>sum =nat ->nat.match(z ->0,s ->s.carrier() +1);
36-
Integerx =Hylomorphism.<Integer,Integer,NatF,NatF<Integer>,NatF<Integer>>hylo().fapply(sum,naturals,0);
31+
Coalgebra<Integer,NatF<Integer>>naturals =i ->NatF.s(i +1);
32+
Algebra<NatF<String>,String>sum =nat ->nat.match(z ->"0",s ->s.carrier() +1);
33+
Stringx =Hylomorphism.<Integer,String,NatF,NatF<Integer>,NatF<String>>hylo().apply(sum,naturals,0);
3734
System.out.println(x);
3835

3936
}

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