Liquid.class.php

<?php
/**
 * Liquid for PHP
 *
 * @package Liquid
 * @copyright Copyright (c) 2011-2012 Harald Hanek,
 * fork of php-liquid (c) 2006 Mateo Murphy,
 * based on Liquid for Ruby (c) 2006 Tobias Luetke
 * @license http://harrydeluxe.mit-license.org
 */

/**
 * The method is called on objects when resolving variables to see
 * if a given property exists
 *
 */
defined('LIQUID_HAS_PROPERTY_METHOD') or define('LIQUID_HAS_PROPERTY_METHOD', 'field_exists');

/**
 * This method is called on object when resolving variables when
 * a given property exists
 *
 */
defined('LIQUID_GET_PROPERTY_METHOD') or define('LIQUID_GET_PROPERTY_METHOD', 'get');

/**
 * Separator between filters
 *
 */
defined('LIQUID_FILTER_SEPARATOR') or define('LIQUID_FILTER_SEPARATOR', '\|');

/**
 * Separator for arguments
 *
 */
defined('LIQUID_ARGUMENT_SEPARATOR') or define('LIQUID_ARGUMENT_SEPARATOR', ',');

/**
 * Separator for argument names and values
 *
 */
defined('LIQUID_FILTER_ARGUMENT_SEPARATOR') or define('LIQUID_FILTER_ARGUMENT_SEPARATOR', ':');

/**
 * Separator for variable attributes
 *
 */
defined('LIQUID_VARIABLE_ATTRIBUTE_SEPARATOR') or define('LIQUID_VARIABLE_ATTRIBUTE_SEPARATOR', '.');

/**
 * Allow Templatenames with extension in include and extends tags. default = false
 *
 */
defined('LIQUID_INCLUDE_ALLOW_EXT') or define('LIQUID_INCLUDE_ALLOW_EXT', false);

/**
 * Suffix for include files
 *
 */
defined('LIQUID_INCLUDE_SUFFIX') or define('LIQUID_INCLUDE_SUFFIX', 'liquid');

/**
 * Prefix for include files
 *
 */
defined('LIQUID_INCLUDE_PREFIX') or define('LIQUID_INCLUDE_PREFIX', '_');
/**
 * Tag start
 *
 */
defined('LIQUID_TAG_START') or define('LIQUID_TAG_START', '{%');

/**
 * Tag end
 *
 */
defined('LIQUID_TAG_END') or define('LIQUID_TAG_END', '%}');

/**
 * Variable start
 *
 */
defined('LIQUID_VARIABLE_START') or define('LIQUID_VARIABLE_START', '{{');

/**
 * Variable end
 *
 */
defined('LIQUID_VARIABLE_END') or define('LIQUID_VARIABLE_END', '}}');

/**
 * The characters allowed in a variable
 *
 */
defined('LIQUID_ALLOWED_VARIABLE_CHARS') or define('LIQUID_ALLOWED_VARIABLE_CHARS', '[a-zA-Z_.-]');

/**
 * Regex for quoted fragments
 *
 */
defined('LIQUID_QUOTED_FRAGMENT') or define('LIQUID_QUOTED_FRAGMENT', '"[^"]+"|\'[^\']+\'|[^\s,|]+');

/**
 * Regex for recognizing tab attributes
 *
 */
defined('LIQUID_TAG_ATTRIBUTES') or define('LIQUID_TAG_ATTRIBUTES', '/(\w+)\s*\:\s*(' . LIQUID_QUOTED_FRAGMENT . ')/');

/**
 * Regex used to split tokens
 *
 */
defined('LIQUID_TOKENIZATION_REGEXP') or define('LIQUID_TOKENIZATION_REGEXP', '/(' . LIQUID_TAG_START . '.*?' . LIQUID_TAG_END . '|' . LIQUID_VARIABLE_START . '.*?' . LIQUID_VARIABLE_END . ')/');


defined('LIQUID_PATH') or define('LIQUID_PATH', dirname(__FILE__));


defined('LIQUID_AUTOLOAD') or define('LIQUID_AUTOLOAD', true);


class Liquid
{
    /**
     * Flatten a multidimensional array into a single array. Does not maintain keys.
     *
     * @param array $array
     * @return array
     */
    public static function array_flatten($array)
    {
        $return = [];

        foreach($array as $element)
        {
            if (is_array($element))
            {
                $return = array_merge($return, self::array_flatten($element));
            }
            else
            {
                $return[] = $element;
            }
        }
        return $return;
    }


    /**
     * Checks if class exists in $_coreClasses array
     *
     * @param string $className class name
     * @return boolean whether the class exists in $_coreClasses
     */
    public static function classExists($className)
    {
        return (isset(self::$_coreClasses[$className])) ? true : false;
    }

    private static $_coreClasses = array(
            'LiquidException' => '/lib/LiquidException.class.php',
            'LiquidRegexp' => '/lib/LiquidRegexp.class.php',
            'LiquidBlock' => '/lib/LiquidBlock.class.php',
            'LiquidContext' => '/lib/LiquidContext.class.php',
            'LiquidDocument' => '/lib/LiquidDocument.class.php',
            'LiquidDrop' => '/lib/LiquidDrop.class.php',
            'LiquidCache' => '/lib/LiquidCache.class.php',
            'LiquidCacheApc' => '/lib/Cache/LiquidCacheApc.class.php',
            'LiquidCacheFile' => '/lib/Cache/LiquidCacheFile.class.php',
            'LiquidBlankFileSystem' => '/lib/LiquidBlankFileSystem.class.php',
            'LiquidLocalFileSystem' => '/lib/LiquidLocalFileSystem.class.php',
            'LiquidFilterbank' => '/lib/LiquidFilterbank.class.php',
            'LiquidTagTablerow' => '/lib/Tag/LiquidTagTablerow.class.php',
            'LiquidDecisionBlock' => '/lib/LiquidDecisionBlock.class.php',
            'LiquidTagInclude' => '/lib/Tag/LiquidTagInclude.class.php',
            'LiquidTagCase' => '/lib/Tag/LiquidTagCase.class.php',
            'LiquidTagAssign' => '/lib/Tag/LiquidTagAssign.class.php',
            'LiquidTagBlock' => '/lib/Tag/LiquidTagBlock.class.php',
            'LiquidTagExtends' => '/lib/Tag/LiquidTagExtends.class.php',
            'LiquidTagComment' => '/lib/Tag/LiquidTagComment.class.php',
            'LiquidTagCapture' => '/lib/Tag/LiquidTagCapture.class.php',
            'LiquidTagCycle' => '/lib/Tag/LiquidTagCycle.class.php',
            'LiquidTagFor' => '/lib/Tag/LiquidTagFor.class.php',
            'LiquidTagIf' => '/lib/Tag/LiquidTagIf.class.php',
            'LiquidTagIncrement' => '/lib/Tag/LiquidTagIncrement.class.php',
            'LiquidTagDecrement' => '/lib/Tag/LiquidTagDecrement.class.php',
            'LiquidStandardFilters' => '/lib/LiquidStandardFilters.class.php',
            'LiquidTag' => '/lib/LiquidTag.class.php',
            'LiquidTemplate' => '/lib/LiquidTemplate.class.php',
            'LiquidVariable' => '/lib/LiquidVariable.class.php'
    );
}