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<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_View
 * @subpackage Helper
 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @version    $Id: HeadStyle.php 24594 2012-01-05 21:27:01Z matthew $
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */

/** Zend_View_Helper_Placeholder_Container_Standalone */
//--//require_once 'Zend/View/Helper/Placeholder/Container/Standalone.php';

/**
 * Helper for setting and retrieving stylesheets
 *
 * @uses       Zend_View_Helper_Placeholder_Container_Standalone
 * @package    Zend_View
 * @subpackage Helper
 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_View_Helper_HeadStyle extends Zend_View_Helper_Placeholder_Container_Standalone
{
    /**
     * Registry key for placeholder
     * @var string
     */
    protected $_regKey = 'Zend_View_Helper_HeadStyle';

/**
     * Allowed optional attributes
     * @var array
     */
    protected $_optionalAttributes = array('lang', 'title', 'media', 'dir');

/**
     * Allowed media types
     * @var array
     */
    protected $_mediaTypes = array(
        'all', 'aural', 'braille', 'handheld', 'print',
        'projection', 'screen', 'tty', 'tv'
    );

/**
     * Capture type and/or attributes (used for hinting during capture)
     * @var string
     */
    protected $_captureAttrs = null;

/**
     * Capture lock
     * @var bool
     */
    protected $_captureLock;

/**
     * Capture type (append, prepend, set)
     * @var string
     */
    protected $_captureType;

/**
     * Constructor
     *
     * Set separator to PHP_EOL.
     *
     * @return void
     */
    public function __construct()
    {
        parent::__construct();
        $this->setSeparator(PHP_EOL);
    }

/**
     * Return headStyle object
     *
     * Returns headStyle helper object; optionally, allows specifying
     *
     * @param  string $content Stylesheet contents
     * @param  string $placement Append, prepend, or set
     * @param  string|array $attributes Optional attributes to utilize
     * @return Zend_View_Helper_HeadStyle
     */
    public function headStyle($content = null, $placement = 'APPEND', $attributes = array())
    {
        if ((null !== $content) && is_string($content)) {
            switch (strtoupper($placement)) {
                case 'SET':
                    $action = 'setStyle';
                    break;
                case 'PREPEND':
                    $action = 'prependStyle';
                    break;
                case 'APPEND':
                default:
                    $action = 'appendStyle';
                    break;
            }
            $this->$action($content, $attributes);
        }

return $this;
    }

/**
     * Overload method calls
     *
     * Allows the following method calls:
     * - appendStyle($content, $attributes = array())
     * - offsetSetStyle($index, $content, $attributes = array())
     * - prependStyle($content, $attributes = array())
     * - setStyle($content, $attributes = array())
     *
     * @param  string $method
     * @param  array $args
     * @return void
     * @throws Zend_View_Exception When no $content provided or invalid method
     */
    public function __call($method, $args)
    {
        if (preg_match('/^(?P<action>set|(ap|pre)pend|offsetSet)(Style)$/', $method, $matches)) {
            $index  = null;
            $argc   = count($args);
            $action = $matches['action'];

if ('offsetSet' == $action) {
                if (0 < $argc) {
                    $index = array_shift($args);
                    --$argc;
                }
            }

if (1 > $argc) {
                //--//require_once 'Zend/View/Exception.php';
                $e = new Zend_View_Exception(sprintf('Method "%s" requires minimally content for the stylesheet', $method));
                $e->setView($this->view);
                throw $e;
            }

$content = $args[0];
            $attrs   = array();
            if (isset($args[1])) {
                $attrs = (array) $args[1];
            }

$item = $this->createData($content, $attrs);

if ('offsetSet' == $action) {
                $this->offsetSet($index, $item);
            } else {
                $this->$action($item);
            }

return $this;
        }

return parent::__call($method, $args);
    }

/**
     * Determine if a value is a valid style tag
     *
     * @param  mixed $value
     * @param  string $method
     * @return boolean
     */
    protected function _isValid($value)
    {
        if ((!$value instanceof stdClass)
            || !isset($value->content)
            || !isset($value->attributes))
        {
            return false;
        }

return true;
    }

/**
     * Override append to enforce style creation
     *
     * @param  mixed $value
     * @return void
     */
    public function append($value)
    {
        if (!$this->_isValid($value)) {
            //--//require_once 'Zend/View/Exception.php';
            $e = new Zend_View_Exception('Invalid value passed to append; please use appendStyle()');
            $e->setView($this->view);
            throw $e;
        }

return $this->getContainer()->append($value);
    }

/**
     * Override offsetSet to enforce style creation
     *
     * @param  string|int $index
     * @param  mixed $value
     * @return void
     */
    public function offsetSet($index, $value)
    {
        if (!$this->_isValid($value)) {
            //--//require_once 'Zend/View/Exception.php';
            $e = new Zend_View_Exception('Invalid value passed to offsetSet; please use offsetSetStyle()');
            $e->setView($this->view);
            throw $e;
        }

return $this->getContainer()->offsetSet($index, $value);
    }

/**
     * Override prepend to enforce style creation
     *
     * @param  mixed $value
     * @return void
     */
    public function prepend($value)
    {
        if (!$this->_isValid($value)) {
            //--//require_once 'Zend/View/Exception.php';
            $e = new Zend_View_Exception('Invalid value passed to prepend; please use prependStyle()');
            $e->setView($this->view);
            throw $e;
        }

return $this->getContainer()->prepend($value);
    }

/**
     * Override set to enforce style creation
     *
     * @param  mixed $value
     * @return void
     */
    public function set($value)
    {
        if (!$this->_isValid($value)) {
            //--//require_once 'Zend/View/Exception.php';
            $e = new Zend_View_Exception('Invalid value passed to set; please use setStyle()');
            $e->setView($this->view);
            throw $e;
        }

return $this->getContainer()->set($value);
    }

/**
     * Start capture action
     *
     * @param  mixed $captureType
     * @param  string $typeOrAttrs
     * @return void
     */
    public function captureStart($type = Zend_View_Helper_Placeholder_Container_Abstract::APPEND, $attrs = null)
    {
        if ($this->_captureLock) {
            //--//require_once 'Zend/View/Helper/Placeholder/Container/Exception.php';
            $e = new Zend_View_Helper_Placeholder_Container_Exception('Cannot nest headStyle captures');
            $e->setView($this->view);
            throw $e;
        }

$this->_captureLock        = true;
        $this->_captureAttrs       = $attrs;
        $this->_captureType        = $type;
        ob_start();
    }

/**
     * End capture action and store
     *
     * @return void
     */
    public function captureEnd()
    {
        $content             = ob_get_clean();
        $attrs               = $this->_captureAttrs;
        $this->_captureAttrs = null;
        $this->_captureLock  = false;

switch ($this->_captureType) {
            case Zend_View_Helper_Placeholder_Container_Abstract::SET:
                $this->setStyle($content, $attrs);
                break;
            case Zend_View_Helper_Placeholder_Container_Abstract::PREPEND:
                $this->prependStyle($content, $attrs);
                break;
            case Zend_View_Helper_Placeholder_Container_Abstract::APPEND:
            default:
                $this->appendStyle($content, $attrs);
                break;
        }
    }

/**
     * Convert content and attributes into valid style tag
     *
     * @param  stdClass $item Item to render
     * @param  string $indent Indentation to use
     * @return string
     */
    public function itemToString(stdClass $item, $indent)
    {
        $attrString = '';
        if (!empty($item->attributes)) {
            $enc = 'UTF-8';
            if ($this->view instanceof Zend_View_Interface
                && method_exists($this->view, 'getEncoding')
            ) {
                $enc = $this->view->getEncoding();
            }
            foreach ($item->attributes as $key => $value) {
                if (!in_array($key, $this->_optionalAttributes)) {
                    continue;
                }
                if ('media' == $key) {
                    if(false === strpos($value, ',')) {
                        if (!in_array($value, $this->_mediaTypes)) {
                            continue;
                        }
                    } else {
                        $media_types = explode(',', $value);
                        $value = '';
                        foreach($media_types as $type) {
                            $type = trim($type);
                            if (!in_array($type, $this->_mediaTypes)) {
                                continue;
                            }
                            $value .= $type .',';
                        }
                        $value = substr($value, 0, -1);
                    }
                }
                $attrString .= sprintf(' %s="%s"', $key, htmlspecialchars($value, ENT_COMPAT, $enc));
            }
        }

$escapeStart = $indent . ''. PHP_EOL;
        if (isset($item->attributes['conditional'])
            && !empty($item->attributes['conditional'])
            && is_string($item->attributes['conditional'])
        ) {
            $escapeStart = null;
            $escapeEnd = null;
        }

$html = '<style type="text/css"' . $attrString . '>' . PHP_EOL
              . $escapeStart . $indent . $item->content . PHP_EOL . $escapeEnd
              . '</style>';

if (null == $escapeStart && null == $escapeEnd) {
            $html = '';
        }

return $html;
    }

/**
     * Create string representation of placeholder
     *
     * @param  string|int $indent
     * @return string
     */
    public function toString($indent = null)
    {
        $indent = (null !== $indent)
                ? $this->getWhitespace($indent)
                : $this->getIndent();

$items = array();
        $this->getContainer()->ksort();
        foreach ($this as $item) {
            if (!$this->_isValid($item)) {
                continue;
            }
            $items[] = $this->itemToString($item, $indent);
        }

$return = $indent . implode($this->getSeparator() . $indent, $items);
        $return = preg_replace("/(\r\n?|\n)/", '$1' . $indent, $return);
        return $return;
    }

/**
     * Create data item for use in stack
     *
     * @param  string $content
     * @param  array $attributes
     * @return stdClass
     */
    public function createData($content, array $attributes)
    {
        if (!isset($attributes['media'])) {
            $attributes['media'] = 'screen';
        } else if(is_array($attributes['media'])) {
            $attributes['media'] = implode(',', $attributes['media']);
        }

$data = new stdClass();
        $data->content    = $content;
        $data->attributes = $attributes;

return $data;
    }
}

Editing: HeadStyle.php

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