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alazhar
2020-01-02 22:20:31 +07:00
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libraries/joomla/form/helper.php Normal file
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<?php
/**
* @package Joomla.Platform
* @subpackage Form
*
* @copyright Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
jimport('joomla.filesystem.path');
/**
* JForm's helper class.
* Provides a storage for filesystem's paths where JForm's entities reside and methods for creating those entities.
* Also stores objects with entities' prototypes for further reusing.
*
* @package Joomla.Platform
* @subpackage Form
* @since 11.1
*/
class JFormHelper
{
/**
* Array with paths where entities(field, rule, form) can be found.
*
* Array's structure:
* <code>
* paths:
* {ENTITY_NAME}:
* - /path/1
* - /path/2
* </code>
*
* @var array
* @since 11.1
*
*/
protected static $paths;
/**
* Static array of JForm's entity objects for re-use.
* Prototypes for all fields and rules are here.
*
* Array's structure:
* <code>
* entities:
* {ENTITY_NAME}:
* {KEY}: {OBJECT}
* </code>
*
* @var array
* @since 11.1
*/
protected static $entities = array();
/**
* Method to load a form field object given a type.
*
* @param string $type The field type.
* @param boolean $new Flag to toggle whether we should get a new instance of the object.
*
* @return mixed JFormField object on success, false otherwise.
*
* @since 11.1
*/
public static function loadFieldType($type, $new = true)
{
return self::loadType('field', $type, $new);
}
/**
* Method to load a form rule object given a type.
*
* @param string $type The rule type.
* @param boolean $new Flag to toggle whether we should get a new instance of the object.
*
* @return mixed JFormRule object on success, false otherwise.
*
* @since 11.1
*/
public static function loadRuleType($type, $new = true)
{
return self::loadType('rule', $type, $new);
}
/**
* Method to load a form entity object given a type.
* Each type is loaded only once and then used as a prototype for other objects of same type.
* Please, use this method only with those entities which support types (forms don't support them).
*
* @param string $entity The entity.
* @param string $type The entity type.
* @param boolean $new Flag to toggle whether we should get a new instance of the object.
*
* @return mixed Entity object on success, false otherwise.
*
* @since 11.1
*/
protected static function loadType($entity, $type, $new = true)
{
// Reference to an array with current entity's type instances
$types = &self::$entities[$entity];
$key = md5($type);
// Return an entity object if it already exists and we don't need a new one.
if (isset($types[$key]) && $new === false)
{
return $types[$key];
}
$class = self::loadClass($entity, $type);
if ($class !== false)
{
// Instantiate a new type object.
$types[$key] = new $class;
return $types[$key];
}
else
{
return false;
}
}
/**
* Attempt to import the JFormField class file if it isn't already imported.
* You can use this method outside of JForm for loading a field for inheritance or composition.
*
* @param string $type Type of a field whose class should be loaded.
*
* @return mixed Class name on success or false otherwise.
*
* @since 11.1
*/
public static function loadFieldClass($type)
{
return self::loadClass('field', $type);
}
/**
* Attempt to import the JFormRule class file if it isn't already imported.
* You can use this method outside of JForm for loading a rule for inheritance or composition.
*
* @param string $type Type of a rule whose class should be loaded.
*
* @return mixed Class name on success or false otherwise.
*
* @since 11.1
*/
public static function loadRuleClass($type)
{
return self::loadClass('rule', $type);
}
/**
* Load a class for one of the form's entities of a particular type.
* Currently, it makes sense to use this method for the "field" and "rule" entities
* (but you can support more entities in your subclass).
*
* @param string $entity One of the form entities (field or rule).
* @param string $type Type of an entity.
*
* @return mixed Class name on success or false otherwise.
*
* @since 11.1
*/
protected static function loadClass($entity, $type)
{
if (strpos($type, '.'))
{
list($prefix, $type) = explode('.', $type);
}
else
{
$prefix = 'J';
}
$class = JString::ucfirst($prefix, '_') . 'Form' . JString::ucfirst($entity, '_') . JString::ucfirst($type, '_');
if (class_exists($class))
{
return $class;
}
// Get the field search path array.
$paths = self::addPath($entity);
// If the type is complex, add the base type to the paths.
if ($pos = strpos($type, '_'))
{
// Add the complex type prefix to the paths.
for ($i = 0, $n = count($paths); $i < $n; $i++)
{
// Derive the new path.
$path = $paths[$i] . '/' . strtolower(substr($type, 0, $pos));
// If the path does not exist, add it.
if (!in_array($path, $paths))
{
$paths[] = $path;
}
}
// Break off the end of the complex type.
$type = substr($type, $pos + 1);
}
// Try to find the class file.
$type = strtolower($type) . '.php';
foreach ($paths as $path)
{
if ($file = JPath::find($path, $type))
{
require_once $file;
if (class_exists($class))
{
break;
}
}
}
// Check for all if the class exists.
return class_exists($class) ? $class : false;
}
/**
* Method to add a path to the list of field include paths.
*
* @param mixed $new A path or array of paths to add.
*
* @return array The list of paths that have been added.
*
* @since 11.1
*/
public static function addFieldPath($new = null)
{
return self::addPath('field', $new);
}
/**
* Method to add a path to the list of form include paths.
*
* @param mixed $new A path or array of paths to add.
*
* @return array The list of paths that have been added.
*
* @since 11.1
*/
public static function addFormPath($new = null)
{
return self::addPath('form', $new);
}
/**
* Method to add a path to the list of rule include paths.
*
* @param mixed $new A path or array of paths to add.
*
* @return array The list of paths that have been added.
*
* @since 11.1
*/
public static function addRulePath($new = null)
{
return self::addPath('rule', $new);
}
/**
* Method to add a path to the list of include paths for one of the form's entities.
* Currently supported entities: field, rule and form. You are free to support your own in a subclass.
*
* @param string $entity Form's entity name for which paths will be added.
* @param mixed $new A path or array of paths to add.
*
* @return array The list of paths that have been added.
*
* @since 11.1
*/
protected static function addPath($entity, $new = null)
{
// Reference to an array with paths for current entity
$paths = &self::$paths[$entity];
// Add the default entity's search path if not set.
if (empty($paths))
{
// While we support limited number of entities (form, field and rule)
// we can do this simple pluralisation:
$entity_plural = $entity . 's';
/*
* But when someday we would want to support more entities, then we should consider adding
* an inflector class to "libraries/joomla/utilities" and use it here (or somebody can use a real inflector in his subclass).
* See also: pluralization snippet by Paul Osman in JControllerForm's constructor.
*/
$paths[] = __DIR__ . '/' . $entity_plural;
}
// Force the new path(s) to an array.
settype($new, 'array');
// Add the new paths to the stack if not already there.
foreach ($new as $path)
{
if (!in_array($path, $paths))
{
array_unshift($paths, trim($path));
}
}
return $paths;
}
}