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• PreconditionDSL.kt

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com.github.spoptchev.kotlin.preconditions.PreconditionDSL.kt Maven / Gradle / Ivy

package com.github.spoptchev.kotlin.preconditions

import com.github.spoptchev.kotlin.preconditions.matcher.*

@DslMarker
annotation class PreconditionDSLMarker

typealias EvaluationMethod = (value: Boolean, lazyMessage: () -> Any) -> Unit

@PreconditionDSLMarker
class PreconditionContext : CollectionMatcher, ComparableMatcher, MapMatcher, StringMatcher, ObjectMatcher {

    infix fun Precondition.and(precondition: Precondition) = AndPrecondition(this, precondition)
    infix fun Precondition.or(precondition: Precondition) = OrPrecondition(this, precondition)
    fun not(precondition: Precondition) = NotPrecondition(precondition)

}

fun  requireThat(value: T, label: String = "value", preconditionContext: PreconditionContext.() -> Precondition): T =
        require(value, label, preconditionContext)
fun  require(value: T, label: String = "value", preconditionContext: PreconditionContext.() -> Precondition): T =
        assertThat(value, label, ::require, preconditionContext)

fun  checkThat(value: T, label: String = "value", preconditionContext: PreconditionContext.() -> Precondition): T =
        check(value, label, preconditionContext)
fun  check(value: T, label: String = "value", preconditionContext: PreconditionContext.() -> Precondition): T =
        assertThat(value, label, ::check, preconditionContext)

private fun  assertThat(value: T, label: String, evaluate: EvaluationMethod, preconditionContext: PreconditionContext.() -> Precondition): T =
        preconditionContext(PreconditionContext()).let { Assertion(value, label, evaluate).run(it) }