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Use contracts for isPresent #950

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merged 2 commits into from
Aug 21, 2023
+16 −2
Merged

Use contracts for isPresent #950

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19a761a
Use contracts for isPresent
DRSchlaubi Aug 21, 2023
26461e8
Fix isOmitted
DRSchlaubi Aug 21, 2023
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18 changes: 16 additions & 2 deletions protocol/src/commonMain/kotlin/dev/arbjerg/lavalink/protocol/v4/omissible.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,8 @@ import kotlinx.serialization.SerializationException
import kotlinx.serialization.descriptors.SerialDescriptor
import kotlinx.serialization.encoding.Decoder
import kotlinx.serialization.encoding.Encoder
import kotlin.contracts.ExperimentalContracts
import kotlin.contracts.contract
import kotlin.jvm.JvmInline

@Serializable(with = OmissableSerializer::class)
Expand Down Expand Up @@ -70,9 +72,21 @@ class OmissableSerializer<T>(private val childSerializer: KSerializer<T>) : KSer
}
}

fun <T : Any> Omissible<T>.isPresent() = this is Omissible.Present
@OptIn(ExperimentalContracts::class)
fun <T : Any> Omissible<T>.isPresent(): Boolean {
contract {
returns(true) implies (this@isPresent is Omissible.Present<T>)
}
return this is Omissible.Present
}

fun <T : Any> Omissible<T>.isOmitted() = this is Omissible.Omitted
@OptIn(ExperimentalContracts::class)
fun <T : Any> Omissible<T>.isOmitted(): Boolean {
contract {
returns(true) implies (this@isOmitted is Omissible.Omitted<T>)
}
return this is Omissible.Omitted
}

fun <T : Any?> Omissible<T>.takeIfPresent(predicate: (T) -> Boolean = { true }) =
if (this is Omissible.Present) value.takeIf(predicate) else null
Expand Down