1 /*
2 * Copyright (C) 2024 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package com.android.systemui.kairos.internal
18
19 import com.android.systemui.kairos.util.Just
20 import com.android.systemui.kairos.util.Maybe
21 import com.android.systemui.kairos.util.just
22 import com.android.systemui.kairos.util.none
23
mapMaybeNodenull24 internal inline fun <A, B> mapMaybeNode(
25 crossinline getPulse: suspend EvalScope.() -> TFlowImpl<A>,
26 crossinline f: suspend EvalScope.(A) -> Maybe<B>,
27 ): TFlowImpl<B> {
28 return DemuxImpl(
29 {
30 mapImpl(getPulse) {
31 val maybeResult = f(it)
32 if (maybeResult is Just) {
33 mapOf(Unit to maybeResult.value)
34 } else {
35 emptyMap()
36 }
37 }
38 },
39 numKeys = 1,
40 )
41 .eventsForKey(Unit)
42 }
43
filterNodenull44 internal inline fun <A> filterNode(
45 crossinline getPulse: suspend EvalScope.() -> TFlowImpl<A>,
46 crossinline f: suspend EvalScope.(A) -> Boolean,
47 ): TFlowImpl<A> = mapMaybeNode(getPulse) { if (f(it)) just(it) else none }
48