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• 0.12.0
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• NotableFlag.kt

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commonMain.it.unibo.tuprolog.solve.flags.NotableFlag.kt Maven / Gradle / Ivy

package it.unibo.tuprolog.solve.flags

import it.unibo.tuprolog.core.Term

interface NotableFlag {
    val name: String
    val defaultValue: Term

    val admissibleValues: Sequence

    fun isAdmissibleValue(value: Term): Boolean =
        value in admissibleValues

    fun toPair(): Pair =
        this to defaultValue

    infix fun to(value: Term): Pair =
        name to (
            value.also {
                require(isAdmissibleValue(it)) {
                    "$value is not an admissible value for flag $name"
                }
            }
            )
}