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• 1.0.0-RC1
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• TransactionalSequence.kt

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com.github.tmarsteel.ktprolog.parser.sequence.TransactionalSequence.kt Maven / Gradle / Ivy

package com.github.tmarsteel.ktprolog.parser.sequence

interface TransactionalSequence : Iterator {
    /**
     * Marks the current position in the sequence. Marks stack: calling this method multiple times creates as many
     * markers. Each of them can be committed or rolled back in reverse order (e.g. `mark(); mark(); commit(); rollback()`).
     */
    fun mark()

    /**
     * Commits the most recent marker: removes that marker from the storage and keeps the position where it currently is.
     */
    fun commit()

    /**
     * Rolls the current position back to the most recent marker and removes that marker from the storage.
     */
    fun rollback()
}