aristath/kirki

<?php
/**
 * Handles CSS output for background-position.
 *
 * @package     Kirki
 * @subpackage  Controls
 * @copyright   Copyright (c) 2019, Ari Stathopoulos (@aristath)
 * @license    https://opensource.org/licenses/MIT
 * @since       2.2.0
 */

namespace Kirki\Module\CSS\Property;

use Kirki\Module\CSS\Property;

/**
 * Output overrides.
 */
class Background_Position extends Property {

    /**
     * Modifies the value.
     *
     * @access protected
     */
    protected function process_value() {
        $this->value = trim( $this->value );

        // If you use calc() there, I suppose you know what you're doing.
        // No need to process this any further, just exit.
        if ( false !== strpos( $this->value, 'calc' ) ) {
            return;
        }

        // If the value is initial or inherit, we don't need to do anything.
        // Just exit.
        if ( 'initial' === $this->value || 'inherit' === $this->value ) {
            return;
        }

        $x_dimensions = [ 'left', 'center', 'right' ];
        $y_dimensions = [ 'top', 'center', 'bottom' ];

        // If there's a space, we have an X and a Y value.
        if ( false !== strpos( $this->value, ' ' ) ) {
            $xy = explode( ' ', $this->value );

            $x = trim( $xy[0] );
            $y = trim( $xy[1] );

            // If x is not left/center/right, we need to sanitize it.
            if ( ! in_array( $x, $x_dimensions, true ) ) {
                $x = sanitize_text_field( $x );
            }
            if ( ! in_array( $y, $y_dimensions, true ) ) {
                $y = sanitize_text_field( $y );
            }
            $this->value = $x . ' ' . $y;
            return;
        }
        $x = 'center';
        foreach ( $x_dimensions as $x_dimension ) {
            if ( false !== strpos( $this->value, $x_dimension ) ) {
                $x = $x_dimension;
            }
        }
        $y = 'center';
        foreach ( $y_dimensions as $y_dimension ) {
            if ( false !== strpos( $this->value, $y_dimension ) ) {
                $y = $y_dimension;
            }
        }
        $this->value = $x . ' ' . $y;
    }
}