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Member "kotlin-1.3.61/spec-docs/name-resolution-motivation.md" (26 Nov 2019, 1338 Bytes) of package /linux/misc/kotlin-1.3.61.tar.gz:


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Motivation

Locals have the highest priority

A variable of function type goes before members:

class A { fun foo() = 1 }

fun test(a: A, foo: () -> Int) {
    with (a) {
        foo()
    }
}

In anonymous objects local variables are chosen, not members:

interface A {
    val foo: Int
}

fun createA(foo: Int) = object : A {
    override val foo = foo
}

Top-level scope chain

The priorities: explicit imports; functions in the same package; star-imports; function from stdlib.

Explicit import should hide descriptors imported by *.

There is no scope for file, because moving a function to another file in the same package should not change the resolution.

The function imported explicitly goes before the function from the same package; the latter one may live in another file.

The order of implicit receivers

See the discussion here: https://youtrack.jetbrains.com/issue/KT-10510.

Technical notes

When we resolve a property foo for a call foo() we don’t stop on the first property, but instead we collect all variables with the name foo and for each of them try to find the invoke function:

class A {
    val foo: () -> Unit = { println("Hello world!") }
}

fun test(foo: Int) {
    with(A()) {
        foo   // parameter
        foo() // property + invoke
    }
}