src.org.kiama.util.Patterns.scala Maven / Gradle / Ivy

Go to download
/**
 * This file is part of Kiama.
 *
 * Copyright (C) 2011-2012 Anthony M Sloane, Macquarie University.
 *
 * Kiama is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * Kiama is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
 * more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Kiama.  (See files COPYING and COPYING.LESSER.)  If not, see
 * .
 */

package org.kiama
package util

/**
 * Patterns that are useful when processing trees.
 */
object Patterns {

    import org.kiama.attribution.Attributable

    /**
     * Match if `x` is an `Attributable` value, returning a pair of `x`
     * and its parent.
     */
    object HasParent {
        def unapply[T <: Attributable] (x : T) = Some (x, x.parent)
    }

}