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/*
 * Copyright 2020 Parsley Contributors 
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */
package parsley.internal.machine.instructions

import parsley.internal.machine.Context

import org.typelevel.scalaccompat.annotation.unused

private [internal] abstract class Instr {
    def apply(ctx: Context): Unit
    def relabel(@unused labels: Array[Int]): this.type = this
    // Instructions should override this if they have mutable state inside!
    def copy: Instr = this
}

private [internal] abstract class InstrWithLabel extends Instr {
    var label: Int
    override def relabel(labels: Array[Int]): this.type = {
        label = labels(label)
        this
    }
}

// It's 2018 and Labels are making a come-back, along with 2 pass assembly
private [internal] final class Label(val i: Int) extends Instr {
    // $COVERAGE-OFF$
    def apply(ctx: Context): Unit = throw new Exception("Cannot execute label") // scalastyle:ignore throw
    // $COVERAGE-ON$
}