commonMain.com.copperleaf.ballast.navigation.internal.BackstackNavigatorImpl.kt Maven / Gradle / Ivy

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Simple URL-based navigation library built on top of Ballast

There is a newer version: 4.2.1

package com.copperleaf.ballast.navigation.internal

import com.copperleaf.ballast.navigation.routing.Backstack
import com.copperleaf.ballast.navigation.routing.BackstackNavigator
import com.copperleaf.ballast.navigation.routing.Destination
import com.copperleaf.ballast.navigation.routing.Route
import com.copperleaf.ballast.navigation.routing.RouteAnnotation
import com.copperleaf.ballast.navigation.routing.RouterContract
import com.copperleaf.ballast.navigation.routing.UnmatchedDestination

internal class BackstackNavigatorImpl(
    private var currentState: RouterContract.State,
    private val currentInput: RouterContract.Inputs,
) : BackstackNavigator {
    override val backstack: Backstack
        get() = currentState.backstack

    override fun updateBackstack(block: (Backstack) -> Backstack) {
        currentState = currentState.copy(
            backstack = block(currentState.backstack)
        )
    }

    override fun matchDestination(destinationUrl: String, extraAnnotations: Set): Destination {
        return currentState.routingTable.findMatch(
            UnmatchedDestination.parse(destinationUrl, extraAnnotations)
        )
    }

    internal fun applyUpdate(): RouterContract.State {
        with(currentInput) {
            navigate()
        }

        return currentState
    }
}