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<?php
/**
* @author Matthew McNaney <mcnaney at gmail dot com>
* @package Global
* @license http://opensource.org/licenses/lgpl-3.0.html
*/
if (!defined('CURRENT_JQUERY')) {
/**
* The current JQuery file.
*/
define('CURRENT_JQUERY', 'Javascript/jquery/jquery-current.js');
}
/**
* Handles information, meta tags, page title, scripts, styles, etc. that
* occur between the <head> tags in a page.
*/
class Head {
/**
* Array of scripts to appear
* @var array
*/
private $script_stack;
/**
* Array of script files
* @var array
*/
private $script_files = array();
/**
* Array of css files
* @var array
*/
private $css_files = array();
/**
* Array of style sheet includes
* @var array
*/
private $css_stack;
/**
* The page title
* @var string
*/
private $page_title = 'Untitled';
/**
* Array of variables to establish before scripts
* @var array
*/
private $javascript_vars;
private $jquery_loaded = false;
/**
* Singleton object of this class
* @var Display\Head
*/
static $head;
public static function singleton()
{
if (empty(self::$head)) {
self::$head = new self;
}
return self::$head;
}
public static function loadJquery()
{
if (!self::$head->jquery_loaded) {
self::$head->includeJavascript('Javascript/jquery/jquery-current.js');
self::$head->jquery_loaded = true;
}
}
/**
* Adds a Javascript object to the script_stack variable
* @param \Javascript $js
*/
public function addJavascript(\Javascript $js)
{
$this->script_stack[] = $js;
}
/**
* Adds a file to the css_files stack
* @param string $file Path to CSS file.
*/
public function includeCSS($file)
{
$this->css_files[md5($file)] = $file;
}
/**
* Includes file path to script_files stack
* @param string $file
*/
public function includeJavascript($file)
{
$this->script_files[md5($file)] = $file;
}
/**
* Adds key = value pairs which are included before the scripts.
* If the key is an array, it is run through and passed back
* @param array|string $key
* @param string $value
*/
public function addJavascriptVar($key, $value = null)
{
if (is_array($key)) {
foreach ($key as $subkey => $subvalue) {
$this->addJavascriptVar($subkey, $subvalue);
}
return;
} elseif (is_null($value)) {
throw new \Exception(t('Missing second parameter'));
}
if (!is_string($key) || !is_string($value)) {
throw new \Exception(t('Key and value pair must be strings'));
}
$this->javascript_vars[$key] = $value;
}
/**
* Sets the title tag in the head.
* @param string $page_title
*/
public function setPageTitle($page_title)
{
$this->page_title = strip_tags(trim($page_title));
}
/**
*
* @return string
*/
public function getKeywords()
{
//@todo finish
return null;
}
/**
* Returns all the collected Javascript saved in the script_stack variable.
* @return string
*/
public function getAllScripts()
{
$scripts = null;
if (!empty($this->script_stack)) {
$scripts[] = "<script>";
foreach ($this->script_stack as $js) {
$scripts[] = $js->getHeadScript();
}
$scripts[] = "</script>\n";
}
if (empty($scripts)) {
return null;
}
return implode("\n", $scripts);
}
/**
* Returns all variables stored in the javascript_vars stack.
* @return string
*/
public function getAllJavascriptVars()
{
$vars = array();
if (!empty($this->javascript_vars)) {
$vars[] = "<script>";
foreach ($this->javascript_vars as $key => $val) {
$vars[] = "var $key = '$val';";
}
$vars[] = "</script>\n";
return implode("\n", $vars);
}
}
/**
* Returns all scripts and includes stacked in the head object for
* print in the header.
* @return string
*/
public function getAllIncludes()
{
if (empty($this->script_files) && empty($this->css_files)) {
return null;
}
$includes = array();
foreach ($this->script_files as $file) {
$includes[] = "<script src=$file></script>";
}
foreach ($this->css_files as $file) {
$includes[] = "<link rel=stylesheet href=$file>";
}
return implode("\n", $includes) . "\n";
}
/**
* @return string The current browser page title
*/
public function getPageTitle()
{
return '<title>' . $this->page_title . "</title>\n";
}
/**
* Retrieves each category of headers used in the head tag.
* @see Display::show()
* @return array
*/
public function getHeadArray()
{
$headers = array();
$headers['page_title'] = $this->getPageTitle();
$headers['keywords'] = $this->getKeywords();
//$headers['base'] = '<base href="' . \Server::getHttp() . $_SERVER['HTTP_HOST'] . preg_replace("/index.*/", "", $_SERVER['PHP_SELF']) . '" />';
$headers['base'] = '<base href="' . SHARED_ASSETS . '" />';
// these are called in this order in case the scripts have includes
$scripts = $this->getAllScripts();
$includes = $this->getAllIncludes();
$vars = $this->getAllJavascriptVars();
$headers['scripts'] = $vars . $includes . $scripts;
return $headers;
}
}
?>