1:  2:  3:  4:  5:  6:  7:  8:  9: 10: 11: 12: 13: 14: 15: 16: 17: 18: 19: 20: 21: 22: 23: 24: 25: 26: 27: 28: 29: 30: 31: 32: 33: 34: 35: 36: 37: 38: 39: 40: 41: 42: 43: 44: 45: 46: 47: 48: 49: 50: 51: 52: 53: 54: 55: 56: 57: 58: 59: 60: 61: 62: 63: 64: 65: 66: 67: 

<?php

/*
 * This file is part of the webmozart/expression package.
 *
 * (c) Bernhard Schussek <bschussek@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Webmozart\Expression\Selector;

use Webmozart\Expression\Expression;
use Webmozart\Expression\Logic\Literal;

/**
 * A logical selector.
 *
 * Evaluates an expression for elements of a structured value.
 *
 * @since  1.0
 *
 * @author Bernhard Schussek <bschussek@gmail.com>
 */
abstract class Selector extends Literal
{
    /**
     * @var Expression
     */
    protected $expr;

    /**
     * Checks whether a value selected from the evaluated value matches an
     * expression.
     *
     * @param Expression $expr The expression to evaluate for the selected value.
     */
    public function __construct(Expression $expr)
    {
        $this->expr = $expr;
    }

    /**
     * Returns the expression that is evaluated for the selected value.
     *
     * @return Expression The inner expression.
     */
    public function getExpression()
    {
        return $this->expr;
    }

    /**
     * {@inheritdoc}
     */
    public function equivalentTo(Expression $other)
    {
        if (get_class($this) !== get_class($other)) {
            return false;
        }

        /* @var Selector $other */
        return $this->expr->equivalentTo($other->expr);
    }
}