/** Returns a new ref that is bound to this ref and vice versa. **/
public static IRxRef <B> comap <A, B>(this IRxRef <A> rx, Fn <A, B> mapper, Fn <B, A> comapper)
{
var bRef = RxRef.a(mapper(rx.value));
bRef.subscribe(b => rx.value = comapper(b));
return(bRef);
}
public IRxRef <B> comap <B>(Fn <A, B> mapper, Fn <B, A> comapper)
{
var bRef = RxRef.a(mapper(value));
bRef.subscribe(b => value = comapper(b));
return(bRef);
}
public static ObserverBuilder <Elem, IRxRef <Elem> > builder <Elem>(Elem value)
{
return(builder => {
var rxRef = new RxRef <Elem>(value);
builder(rxRef);
return rxRef;
});
}
public static IRxVal <A> get(A value)
{
return(staticCache.get(value).getOrElse(() => {
var cached = (IRxVal <A>)RxRef.a(value);
staticCache.Add(value, cached);
return cached;
}));
}
public static IRxVal <A> extractFuture <A>(
this Future <IRxVal <A> > future, A whileNotCompleted
)
{
var rx = RxRef.a(whileNotCompleted);
future.onComplete(rx2 => rx2.subscribe(v => rx.value = v));
return(rx);
}
public static ObserverBuilder <Elem, IRxVal <Elem> > builder <Elem>(Elem value)
{
// Unity Mono doesn't quite understand that it is the same type :|
// return RxRef.builder(value);
return(builder => {
var rxRef = new RxRef <Elem>(value);
builder(rxRef);
return (IRxVal <Elem>)rxRef;
});
}
public void WhenFromSingleItem()
{
var rx = RxRef.a(3.some());
var dst = new[] { rx }.anyDefined();
dst.value.shouldBeSome(3);
rx.value = Option <int> .None;
dst.value.shouldBeNone();
rx.value = 4.some();
dst.value.shouldBeSome(4);
}
public void WhenFromSingleItemSearchForFalse()
{
var rx = RxRef.a(false);
var dst = new[] { rx }.anyOf(searchFor: false);
dst.value.shouldBeTrue();
rx.value = true;
dst.value.shouldBeFalse();
rx.value = false;
dst.value.shouldBeTrue();
}
public void WhenFromSingleItem()
{
var rx = RxRef.a(3);
var rx2 = new[] { rx }.anyThat(i => i % 2 != 0);
rx2.value.shouldBeSome(3);
rx.value = 2;
rx2.value.shouldBeNone();
rx.value = 5;
rx2.value.shouldBeSome(5);
}
public void WhenMultipleItemsSearchForFalse()
{
var rx1 = RxRef.a(false);
var rx2 = RxRef.a(true);
var dst = new[] { rx1, rx2 }.anyOf(searchFor: false);
dst.value.shouldBeTrue();
rx1.value = true;
dst.value.shouldBeFalse();
rx2.value = false;
dst.value.shouldBeTrue();
rx1.value = false;
dst.value.shouldBeTrue();
}
public virtual IRxVal <Option <A> > rxElement(int index)
{
return(elementRxRefs.get(index).fold(
() => {
var rxRef = RxRef.a(this.get(index));
// The cast is mono bug.
// ArrayTypeMismatchException: Source array type cannot be assigned to destination array type.
// (wrapper stelemref) object:stelemref (object,intptr,object)
elementRxRefs[index] = rxRef;
return rxRef;
},
_ => _
));
}
public void ctor() => describe(() => {
var mapperInvocations = 0;
var actionInvocations = 0;
var lastActionResult = 0;
IRxRef <Tpl <int, int> > src = null;
IRxVal <int> rx = null;
beforeEach += () => {
mapperInvocations = 0;
actionInvocations = 0;
src = RxRef.a(F.t(10, 0));
rx = new RxVal <int>(
-11,
setValue => src.subscribeWithoutEmit(tracker, t => {
mapperInvocations++;
setValue(t._1 + t._2 + 1);
})
);
rx.subscribe(tracker, i => {
actionInvocations++;
lastActionResult = i;
});
};
on["creation"] = () => {
it["should create a subscription to source"] = () => src.subscribers.shouldEqual(1);
it["should not invoke mapper"] = () => mapperInvocations.shouldEqual(0);
it["should have specified value"] = () => rx.value.shouldEqual(-11);
it["should invoke action"] = () => actionInvocations.shouldEqual(1);
it["should invoke action with current value"] = () => lastActionResult.shouldEqual(-11);
when["source changes"] = () => {
beforeEach += () => src.value = F.t(2, 3);
it["should invoke mapper"] = () => mapperInvocations.shouldEqual(1);
it["should update value"] = () => rx.value.shouldEqual(6);
it["should invoke action"] = () => actionInvocations.shouldEqual(2);
it["should invoke action with recomputed value"] = () => lastActionResult.shouldEqual(6);
when["source changes, but transformation result is the same"] = () => {
beforeEach += () => src.value = F.t(3, 2);
it["should invoke mapper"] = () => mapperInvocations.shouldEqual(2);
it["should keep the value same"] = () => rx.value.shouldEqual(6);
it["should not invoke action"] = () => actionInvocations.shouldEqual(2);
};
};
};
});
public void WhenMultipleItems()
{
Fn <int, bool> predicate = i => i % 2 != 0;
Fn <Option <int>, bool> matchPredicate = _ => _.exists(predicate);
var rx1 = RxRef.a(3);
var rx2 = RxRef.a(4);
var dst = new[] { rx1, rx2 }.anyThat(predicate);
dst.value.shouldMatch(matchPredicate);
rx1.value = 2;
dst.value.shouldBeNone();
rx2.value = 5;
dst.value.shouldMatch(matchPredicate);
rx1.value = 1;
dst.value.shouldMatch(matchPredicate);
}
public void WhenMultipleItems()
{
var rx1 = RxRef.a(3.some());
var rx2 = RxRef.a(Option <int> .None);
var dst = new[] { rx1, rx2 }.anyDefined();
dst.value.shouldBeSome(3);
rx1.value = Option <int> .None;
dst.value.shouldBeNone();
rx2.value = 4.some();
dst.value.shouldBeSome(4);
rx1.value = 1.some();
dst.value.shouldBeAnySome();
rx2.value = Option <int> .None;
dst.value.shouldBeSome(1);
}
/** Convert an enum of rx values into one rx value using a traversal function. **/
public static IRxVal <B> traverse <A, B>(
this IEnumerable <IRxVal <A> > vals, Fn <IEnumerable <A>, B> traverse
)
{
Fn <IEnumerable <A> > readValues = () => vals.Select(v => v.value);
var val = RxRef.a(traverse(readValues()));
// TODO: this is probably suboptimal.
Act rescan = () => val.value = traverse(readValues());
foreach (var rxVal in vals)
{
rxVal.subscribe(_ => rescan(), emitCurrent: false);
}
rescan();
return(val);
}
/* Returns first value that satisfies the predicate. */
public static IRxVal <Option <A> > firstThat <A>(this IEnumerable <IRxVal <A> > vals, Fn <A, bool> predicate)
{
var val = RxRef.a(F.none <A>());
// TODO: this is probably suboptimal.
Act rescan = () => {
foreach (var rxVal in vals.Where(rxVal => predicate(rxVal.value)))
{
val.value = F.some(rxVal.value);
return;
}
val.value = F.none <A>();
};
foreach (var rxVal in vals)
{
rxVal.subscribe(_ => rescan(), emitCurrent: false);
}
rescan();
return(val);
}
public RxList()
{
_rxSize = RxRef.a(0);
}
public static ObserverBuilder <Elem, IRxVal <Elem> > builder <Elem>(Elem value)
{
return(RxRef.builder(value));
}