126 lines
3.8 KiB
Kotlin
126 lines
3.8 KiB
Kotlin
/*
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* Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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import kotlinx.coroutines.test.runTest
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import net.sergeych.lyng.eval
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import kotlin.test.Test
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class MIQualifiedDispatchTest {
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@Test
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fun testQualifiedMethodResolution() = runTest {
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eval(
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"""
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class Foo(val a) {
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fun common() { "A" }
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fun runA() { "ResultA:" + a }
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}
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class Bar(val b) {
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fun common() { "B" }
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fun runB() { "ResultB:" + b }
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}
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class FooBar(a0,b0) : Foo(a0), Bar(b0) { }
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val fb = FooBar(1,2)
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// unqualified picks leftmost base
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assertEquals("A", fb.common())
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// cast-based disambiguation
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assertEquals("B", (fb as Bar).common())
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assertEquals("A", (fb as Foo).common())
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// Note: wrappers using this@Type inside FooBar body will be validated later
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// when class-body method registration is finalized.
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""".trimIndent()
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)
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}
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@Test
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fun testQualifiedFieldReadWrite() = runTest {
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eval(
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"""
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class Foo(val a) { var tag = "F" }
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class Bar(val b) { var tag = "B" }
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class FooBar(a0,b0) : Foo(a0), Bar(b0) { }
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val fb = FooBar(1,2)
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// unqualified resolves to rightmost base
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assertEquals("B", fb.tag)
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// qualified reads via casts should respect the ancestor view
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assertEquals("F", (fb as Foo).tag)
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assertEquals("B", (fb as Bar).tag)
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// unqualified write updates rightmost base
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fb.tag = "X"
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assertEquals("X", fb.tag)
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assertEquals("F", (fb as Foo).tag)
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assertEquals("X", (fb as Bar).tag)
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// qualified write via cast targets Bar
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(fb as Bar).tag = "Y"
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assertEquals("F", (fb as Foo).tag)
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assertEquals("Y", (fb as Bar).tag)
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""".trimIndent()
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)
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}
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@Test
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fun testCastsUseDistinctAncestorStorage() = runTest {
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eval(
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"""
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class A { var x = 1 }
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class B : A { override var x = 2 }
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class C : A { override var x = 3 }
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class D : B, C { }
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val d = D()
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assertEquals(2, (d as B).x)
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assertEquals(3, (d as C).x)
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assertEquals(1, (d as A).x)
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(d as B).x = 100
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assertEquals(100, (d as B).x)
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assertEquals(3, (d as C).x)
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assertEquals(1, (d as A).x)
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(d as C).x = 200
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assertEquals(100, (d as B).x)
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assertEquals(200, (d as C).x)
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assertEquals(1, (d as A).x)
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""".trimIndent()
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)
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}
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@Test
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fun testCastsAndSafeCall() = runTest {
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eval(
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"""
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class Foo(val a) { fun runA() { "ResultA:" + a } }
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class Bar(val b) { fun runB() { "ResultB:" + b } }
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class Buzz : Bar(3)
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val buzz = Buzz()
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assertEquals("ResultB:3", buzz.runB())
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assertEquals("ResultB:3", (buzz as? Bar)?.runB())
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assertEquals(null, (buzz as? Foo)?.runA())
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""".trimIndent()
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)
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}
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}
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