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<?php
/**
* @package Joomla.Platform
* @subpackage Microdata
*
* @copyright Copyright (C) 2005 - 2015 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* Joomla Platform class for interacting with Microdata semantics.
*
* @since 3.2
*/
class JMicrodata
{
/**
* Array with all available Types and Properties
*
* @var array
* @since 3.2
*/
protected static $types = null;
/**
* The Schema.org Type
*
* @var string
* @since 3.2
*/
protected $type = null;
/**
* The Property
*
* @var string
* @since 3.2
*/
protected $property = null;
/**
* The Human value or Machine value
*
* @var string
* @since 3.2
*/
protected $content = null;
/**
* The Machine value
*
* @var string
* @since 3.2
*/
protected $machineContent = null;
/**
* Fallback Type
*
* @var string
* @since 3.2
*/
protected $fallbackType = null;
/**
* Fallback Property
*
* @var string
* @since 3.2
*/
protected $fallbackProperty = null;
/**
* Used to check if a Fallback must be used
*
* @var string
* @since 3.2
*/
protected $fallback = false;
/**
* Used to check if the Microdata semantics output are enabled or disabled
*
* @var boolean
* @since 3.2
*/
protected $enabled = true;
/**
* Initialize the class and setup the default Type
*
* @param string $type Optional, Fallback to Thing Type
* @param boolean $flag Enable or disable microdata output
*
* @since 3.2
*/
public function __construct($type = '', $flag = true)
{
if ($this->enabled = (boolean) $flag)
{
// Fallback to Thing Type
if (!$type)
{
$type = 'Thing';
}
$this->setType($type);
}
}
/**
* Load all Types and Properties from the types.json file
*
* @return void
*
* @since 3.2
*/
protected static function loadTypes()
{
// Load the JSON
if (!static::$types)
{
$path = JPATH_PLATFORM . '/joomla/microdata/types.json';
static::$types = json_decode(file_get_contents($path), true);
}
}
/**
* Reset all params
*
* @return void
*
* @since 3.2
*/
protected function resetParams()
{
$this->content = null;
$this->machineContent = null;
$this->property = null;
$this->fallbackProperty = null;
$this->fallbackType = null;
$this->fallback = false;
}
/**
* Enable or Disable Microdata semantics output
*
* @param boolean $flag Enable or disable microdata output
*
* @return JMicrodata Instance of $this
*
* @since 3.2
*/
public function enable($flag = true)
{
$this->enabled = (boolean) $flag;
return $this;
}
/**
* Return true if Microdata semantics output are enabled
*
* @return boolean
*
* @since 3.2
*/
public function isEnabled()
{
return $this->enabled;
}
/**
* Set a new Schema.org Type
*
* @param string $type The Type to be setup
*
* @return JMicrodata Instance of $this
*
* @since 3.2
*/
public function setType($type)
{
if (!$this->enabled)
{
return $this;
}
// Sanitize the Type
$this->type = static::sanitizeType($type);
// If the given Type isn't available, fallback to Thing
if (!static::isTypeAvailable($this->type))
{
$this->type = 'Thing';
}
return $this;
}
/**
* Return the current Type name
*
* @return string
*
* @since 3.2
*/
public function getType()
{
return $this->type;
}
/**
* Setup a Property
*
* @param string $property The Property
*
* @return JMicrodata Instance of $this
*
* @since 3.2
*/
public function property($property)
{
if (!$this->enabled)
{
return $this;
}
// Sanitize the Property
$property = static::sanitizeProperty($property);
// Control if the Property exist in the given Type and setup it, if not leave NULL
if (static::isPropertyInType($this->type, $property))
{
$this->property = $property;
}
else
{
$this->fallback = true;
}
return $this;
}
/**
* Return the property variable
*
* @return string
*
* @since 3.2
*/
public function getProperty()
{
return $this->property;
}
/**
* Setup a Text value or Content value for the Microdata
*
* @param string $value The human value or marchine value to be used
* @param string $machineValue The machine value
*
* @return JMicrodata Instance of $this
*
* @since 3.2
*/
public function content($value, $machineValue = null)
{
$this->content = $value;
$this->machineContent = $machineValue;
return $this;
}
/**
* Return the content variable
*
* @return string
*
* @since 3.2
*/
public function getContent()
{
return $this->content;
}
/**
* Setup a Fallback Type and Property
*
* @param string $type The Fallback Type
* @param string $property The Fallback Property
*
* @return JMicrodata Instance of $this
*
* @since 3.2
*/
public function fallback($type, $property)
{
if (!$this->enabled)
{
return $this;
}
// Sanitize the Type
$this->fallbackType = static::sanitizeType($type);
// If the given Type isn't available, fallback to Thing
if (!static::isTypeAvailable($this->fallbackType))
{
$this->fallbackType = 'Thing';
}
// Control if the Property exist in the given Type and setup it, if not leave NULL
if (static::isPropertyInType($this->fallbackType, $property))
{
$this->fallbackProperty = $property;
}
else
{
$this->fallbackProperty = null;
}
return $this;
}
/**
* Return the fallbackType variable
*
* @return string
*
* @since 3.2
*/
public function getFallbackType()
{
return $this->fallbackType;
}
/**
* Return the fallbackProperty variable
*
* @return string
*
* @since 3.2
*/
public function getFallbackProperty()
{
return $this->fallbackProperty;
}
/**
* This function handle the logic of a Microdata intelligent display.
* Check if the Type, Property are available, if not check for a Fallback,
* then reset all params for the next use and
* return the Microdata HTML
*
* @param string $displayType Optional, 'inline', available ['inline'|'span'|'div'|meta]
* @param boolean $emptyOutput Return an empty string if the microdata output is disabled and there is a $content value
*
* @return string
*
* @since 3.2
*/
public function display($displayType = '', $emptyOutput = false)
{
// Initialize the HTML to output
$html = ($this->content !== null) ? $this->content : '';
// Control if the Microdata output is enabled, otherwise return the content or empty string
if (!$this->enabled)
{
// Reset params
$this->resetParams();
return ($emptyOutput) ? '' : $html;
}
// If the property is wrong for the current Type check if Fallback available, otherwise return empty HTML
if ($this->property && !$this->fallback)
{
// Process and return the HTML the way the user expects to
if ($displayType)
{
switch ($displayType)
{
case 'span':
$html = static::htmlSpan($html, $this->property);
break;
case 'div':
$html = static::htmlDiv($html, $this->property);
break;
case 'meta':
$html = ($this->machineContent !== null) ? $this->machineContent : $html;
$html = static::htmlMeta($html, $this->property);
break;
default:
// Default $displayType = 'inline'
$html = static::htmlProperty($this->property);
break;
}
}
else
{
/*
* Process and return the HTML in an automatic way,
* with the Property expected Types and display the Microdata in the right way,
* check if the Property is normal, nested or must be rendered in a metadata tag
*/
switch (static::getExpectedDisplayType($this->type, $this->property))
{
case 'nested':
// Retrive the expected nested Type of the Property
$nestedType = static::getExpectedTypes($this->type, $this->property);
$nestedProperty = '';
// If there is a Fallback Type then probably it could be the expectedType
if (in_array($this->fallbackType, $nestedType))
{
$nestedType = $this->fallbackType;
if ($this->fallbackProperty)
{
$nestedProperty = $this->fallbackProperty;
}
}
else
{
$nestedType = $nestedType[0];
}
// Check if a Content is available, otherwise Fallback to an 'inline' display type
if ($this->content !== null)
{
if ($nestedProperty)
{
$html = static::htmlSpan(
$this->content,
$nestedProperty
);
}
$html = static::htmlSpan(
$html,
$this->property,
$nestedType,
true
);
}
else
{
$html = static::htmlProperty($this->property) . ' ' . static::htmlScope($nestedType);
if ($nestedProperty)
{
$html .= ' ' . static::htmlProperty($nestedProperty);
}
}
break;
case 'meta':
// Check if the Content value is available, otherwise Fallback to an 'inline' display Type
if ($this->content !== null)
{
$html = ($this->machineContent !== null) ? $this->machineContent : $this->content;
$html = static::htmlMeta($html, $this->property) . $this->content;
}
else
{
$html = static::htmlProperty($this->property);
}
break;
default:
/*
* Default expected display type = 'normal'
* Check if the Content value is available,
* otherwise Fallback to an 'inline' display Type
*/
if ($this->content !== null)
{
$html = static::htmlSpan($this->content, $this->property);
}
else
{
$html = static::htmlProperty($this->property);
}
break;
}
}
}
elseif ($this->fallbackProperty)
{
// Process and return the HTML the way the user expects to
if ($displayType)
{
switch ($displayType)
{
case 'span':
$html = static::htmlSpan($html, $this->fallbackProperty, $this->fallbackType);
break;
case 'div':
$html = static::htmlDiv($html, $this->fallbackProperty, $this->fallbackType);
break;
case 'meta':
$html = ($this->machineContent !== null) ? $this->machineContent : $html;
$html = static::htmlMeta($html, $this->fallbackProperty, $this->fallbackType);
break;
default:
// Default $displayType = 'inline'
$html = static::htmlScope($type::scope()) . ' ' . static::htmlProperty($this->fallbackProperty);
break;
}
}
else
{
/*
* Process and return the HTML in an automatic way,
* with the Property expected Types an display the Microdata in the right way,
* check if the Property is nested or must be rendered in a metadata tag
*/
switch (static::getExpectedDisplayType($this->fallbackType, $this->fallbackProperty))
{
case 'meta':
// Check if the Content value is available, otherwise Fallback to an 'inline' display Type
if ($this->content !== null)
{
$html = ($this->machineContent !== null) ? $this->machineContent : $this->content;
$html = static::htmlMeta($html, $this->fallbackProperty, $this->fallbackType);
}
else
{
$html = static::htmlScope($this->fallbackType) . ' ' . static::htmlProperty($this->fallbackProperty);
}
break;
default:
/*
* Default expected display type = 'normal'
* Check if the Content value is available,
* otherwise Fallback to an 'inline' display Type
*/
if ($this->content !== null)
{
$html = static::htmlSpan($this->content, $this->fallbackProperty);
$html = static::htmlSpan($html, '', $this->fallbackType);
}
else
{
$html = static::htmlScope($this->fallbackType) . ' ' . static::htmlProperty($this->fallbackProperty);
}
break;
}
}
}
elseif (!$this->fallbackProperty && $this->fallbackType !== null)
{
$html = static::htmlScope($this->fallbackType);
}
// Reset params
$this->resetParams();
return $html;
}
/**
* Return the HTML of the current Scope
*
* @return string
*
* @since 3.2
*/
public function displayScope()
{
// Control if the Microdata output is enabled, otherwise return the content or empty string
if (!$this->enabled)
{
return '';
}
return static::htmlScope($this->type);
}
/**
* Return the sanitized Type
*
* @param string $type The Type to sanitize
*
* @return string
*
* @since 3.2
*/
public static function sanitizeType($type)
{
return ucfirst(trim($type));
}
/**
* Return the sanitized Property
*
* @param string $property The Property to sanitize
*
* @return string
*
* @since 3.2
*/
public static function sanitizeProperty($property)
{
return lcfirst(trim($property));
}
/**
* Return an array with all Types and Properties
*
* @return array
*
* @since 3.2
*/
public static function getTypes()
{
static::loadTypes();
return static::$types;
}
/**
* Return an array with all available Types
*
* @return array
*
* @since 3.2
*/
public static function getAvailableTypes()
{
static::loadTypes();
return array_keys(static::$types);
}
/**
* Return the expected types of the Property
*
* @param string $type The Type to process
* @param string $property The Property to process
*
* @return array
*
* @since 3.2
*/
public static function getExpectedTypes($type, $property)
{
static::loadTypes();
$tmp = static::$types[$type]['properties'];
// Check if the Property is in the Type
if (isset($tmp[$property]))
{
return $tmp[$property]['expectedTypes'];
}
// Check if the Property is inherit
$extendedType = static::$types[$type]['extends'];
// Recursive
if (!empty($extendedType))
{
return static::getExpectedTypes($extendedType, $property);
}
return array();
}
/**
* Return the expected display type of the [normal|nested|meta]
* In wich way to display the Property:
* normal -> itemprop="name"
* nested -> itemprop="director" itemscope itemtype="http://schema.org/Person"
* meta -> <meta itemprop="datePublished" content="1991-05-01">
*
* @param string $type The Type where to find the Property
* @param string $property The Property to process
*
* @return string
*
* @since 3.2
*/
protected static function getExpectedDisplayType($type, $property)
{
$expectedTypes = static::getExpectedTypes($type, $property);
// Retrieve the first expected type
$type = $expectedTypes[0];
// Check if it's a meta display
if ($type === 'Date' || $type === 'DateTime' || $property === 'interactionCount')
{
return 'meta';
}
// Check if it's a normal display
if ($type === 'Text' || $type === 'URL' || $type === 'Boolean' || $type === 'Number')
{
return 'normal';
}
// Otherwise it's a nested display
return 'nested';
}
/**
* Recursive function, control if the given Type has the given Property
*
* @param string $type The Type where to check
* @param string $property The Property to check
*
* @return boolean
*
* @since 3.2
*/
public static function isPropertyInType($type, $property)
{
if (!static::isTypeAvailable($type))
{
return false;
}
// Control if the Property exists, and return true
if (array_key_exists($property, static::$types[$type]['properties']))
{
return true;
}
// Recursive: Check if the Property is inherit
$extendedType = static::$types[$type]['extends'];
if (!empty($extendedType))
{
return static::isPropertyInType($extendedType, $property);
}
return false;
}
/**
* Control if the given Type class is available
*
* @param string $type The Type to check
*
* @return boolean
*
* @since 3.2
*/
public static function isTypeAvailable($type)
{
static::loadTypes();
return (array_key_exists($type, static::$types)) ? true : false;
}
/**
* Return the microdata in a <meta> tag with content for machines.
*
* @param string $content The machine content to display
* @param string $property The Property
* @param string $scope Optional, the Type scope to display
* @param boolean $inverse Optional, default = false, inverse the $scope with the $property
*
* @return string
*
* @since 3.2
*/
public static function htmlMeta($content, $property, $scope = '', $inverse = false)
{
// Control if the Property has allready the itemprop
if (stripos($property, 'itemprop') !== 0)
{
$property = static::htmlProperty($property);
}
// Control if the Scope have allready the itemtype
if (!empty($scope) && stripos($scope, 'itemscope') !== 0)
{
$scope = static::htmlScope($scope);
}
if ($inverse)
{
$tmp = join(' ', array($property, $scope));
}
else
{
$tmp = join(' ', array($scope, $property));
}
$tmp = trim($tmp);
return "<meta $tmp content='$content'/>";
}
/**
* Return the microdata in a <span> tag.
*
* @param string $content The human value
* @param string $property Optional, the human value to display
* @param string $scope Optional, the Type scope to display
* @param boolean $inverse Optional, default = false, inverse the $scope with the $property
*
* @return string
*
* @since 3.2
*/
public static function htmlSpan($content, $property = '', $scope = '', $inverse = false)
{
// Control if the Property has allready the itemprop
if (!empty($property) && stripos($property, 'itemprop') !== 0)
{
$property = static::htmlProperty($property);
}
// Control if the Scope have allready the itemtype
if (!empty($scope) && stripos($scope, 'itemscope') !== 0)
{
$scope = static::htmlScope($scope);
}
if ($inverse)
{
$tmp = join(' ', array($property, $scope));
}
else
{
$tmp = join(' ', array($scope, $property));
}
$tmp = trim($tmp);
$tmp = ($tmp) ? ' ' . $tmp : '';
return "<span$tmp>$content</span>";
}
/**
* Return the microdata in an <div> tag.
*
* @param string $content The human value
* @param string $property Optional, the human value to display
* @param string $scope Optional, the Type scope to display
* @param boolean $inverse Optional, default = false, inverse the $scope with the $property
*
* @return string
*
* @since 3.2
*/
public static function htmlDiv($content, $property = '', $scope = '', $inverse = false)
{
// Control if the Property has allready the itemprop
if (!empty($property) && stripos($property, 'itemprop') !== 0)
{
$property = static::htmlProperty($property);
}
// Control if the Scope have allready the itemtype
if (!empty($scope) && stripos($scope, 'itemscope') !== 0)
{
$scope = static::htmlScope($scope);
}
if ($inverse)
{
$tmp = join(' ', array($property, $scope));
}
else
{
$tmp = join(' ', array($scope, $property));
}
$tmp = trim($tmp);
$tmp = ($tmp) ? ' ' . $tmp : '';
return "<div$tmp>$content</div>";
}
/**
* Return the HTML Scope
*
* @param string $scope The Scope to process
*
* @return string
*
* @since 3.2
*/
public static function htmlScope($scope)
{
if (stripos($scope, 'http') !== 0)
{
$scope = 'https://schema.org/' . ucfirst($scope);
}
return "itemscope itemtype='$scope'";
}
/**
* Return the HTML Property
*
* @param string $property The Property to process
*
* @return string
*
* @since 3.2
*/
public static function htmlProperty($property)
{
return "itemprop='$property'";
}
}
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