<?php
/**
 * EGroupware API: generates html with methods representing html-tags or higher widgets
 *
 * @link http://www.egroupware.org
 * @author Ralf Becker <RalfBecker-AT-outdoor-training.de> complete rewrite in 6/2006 and earlier modifications
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @author RalfBecker-AT-outdoor-training.de
 * @copyright 2001-2016 by RalfBecker@outdoor-training.de
 * @package api
 * @subpackage html
 * @version $Id$
 */

namespace EGroupware\Api;
use EGroupware\Api\Header\ContentSecurityPolicy;
/**
 * Generates html with methods representing html-tags or higher widgets
 *
 * The class has only static methods now, so there's no need to instanciate as object anymore!
 */
class Html
{
	/**
	 * Automatically turn on enhanced selectboxes if there's more than this many options
	 */
	const SELECT_ENHANCED_ROW_COUNT = 12;

	/**
	 * activates URLs in a text, URLs get replaced by html-links
	 *
	 * @param string $content text containing URLs
	 * @return string html with activated links
	 */
	static function activate_links($content)
	{
		if (!$content || strlen($content) < 20) return $content;	// performance

		// Exclude everything which is already a link
		$NotAnchor = '(?<!"|href=|href\s=\s|href=\s|href\s=)';

		// spamsaver emailaddress
		$result = preg_replace('/'.$NotAnchor.'mailto:([a-z0-9._-]+)@([a-z0-9_-]+)\.([a-z0-9._-]+)/i',
			"<a href=\"mailto:$1@$2.$3\" target=\"_blank\">$1 AT $2 DOT $3</a>",
			$content);

		//  First match things beginning with http:// (or other protocols)
		$optBracket0 = '(<|&lt;)';
		$Protocol = '(http:\/\/|(ftp:\/\/|https:\/\/))';	// only http:// gets removed, other protocolls are shown
		$Domain = '([\w-]+\.[\w\-.]+)';
		$Subdir = '([\w\-\.,@?^=%&;:\/~\+#]*[\w\-\@?^=%&\/~\+#])?';
		$optBracket = '(>|&gt;)';
		$Expr = '/' .$optBracket0. $NotAnchor . $Protocol . $Domain . $Subdir . $optBracket . '/i';
		// use preg_replace_callback as we experienced problems with https links
		$result2 = preg_replace_callback($Expr, function ($match)
		{
			return $match[1]."<a href=\"".($match[2]&&!$match[3]?$match[2]:'').($match[3]?$match[3]:'').$match[4].$match[5]."\" target=\"_blank\">".$match[4].$match[5]."</a>".$match[6];
		}, $result);

		if (true)	// hack to keep IDE from complaing about double assignments
		{
			//  First match things beginning with http:// (or other protocols)
			$Protocol = '(http:\/\/|(ftp:\/\/|https:\/\/))';	// only http:// gets removed, other protocolls are shown
			$Domain = '([\w-]+\.[\w\-.]+)';
			$Subdir = '([\w\-\.,@?^=%&!;:\/~\+#]*[\w\-\@?^=%&\/~\+#])?';
			$optStuff = '(&quot;|&quot|;)?';
			$Expr = '/' . $NotAnchor . $Protocol . $Domain . $Subdir . $optStuff . '/i';
			// use preg_replace_callback as we experienced problems with https links
			$result3 = preg_replace_callback($Expr, function ($match)
			{
				$additionalQuote="";//at the end, ...
				// only one &quot at the end is found. chance is, it is not belonging to the URL
				if (!empty($match[5]) && $match[5]===';' && (strlen($match[4])-6) >=0 && strpos($match[4],'&quot',strlen($match[4])-6)!==false && strpos(substr($match[4],0,strlen($match[4])-6),'&quot')===false)
				{
					$match[4] = substr($match[4],0,strpos($match[4],'&quot',strlen($match[4])-6));
					$additionalQuote = "&quot;";
				}
				// if there is quoted stuff within the URL then we have at least one more &quot; in match[4], so chance is the last &quot is matched by the one within
				if (!empty($match[5]) && $match[5]===';' && (strlen($match[4])-6) >=0 && strpos($match[4],'&quot',strlen($match[4])-6)!==false && strpos(substr($match[4],0,strlen($match[4])-6),'&quot')!==false)
				{
					$match[4] .= $match[5];
				}
				if (!empty($match[5]) && $match[5]===';' && $match[4]==="&quot")
				{
					$match[4] ='';
					$additionalQuote = "&quot;";
				}
				//error_log(__METHOD__.__LINE__.array2string($match));
				return "<a href=\"".($match[1]&&!$match[2]?$match[1]:'').($match[2]?:'').$match[3].($match[4]??'')."\" target=\"_blank\">".$match[3].($match[4]??'')."</a>$additionalQuote";
			}, $result2);

			//  Now match things beginning with www.
			$optBracket0 = '(<|&lt;)?';
			$NotHTTP = '(?<!:\/\/|" target=\"_blank\">)';	//	avoid running again on http://www links already handled above
			$Domain2 = 'www(\.[\w\-.]+)';
			$Subdir2 = '([\w\-\.,@?^=%&:\/~\+#]*[\w\-\@?^=%&\/~\+#])?';
			$optBracket = '(>|&gt;|&gt|;)?';
			$Expr = '/' .$optBracket0. $NotAnchor . $NotHTTP . $Domain2 . $Subdir2 .$optBracket. '/i';
			//$Expr = '/' . $NotAnchor . $NotHTTP . $Domain . $Subdir . $optBracket . '/i';
			// use preg_replace_callback as we experienced problems with links such as <www.example.tld/pfad/zu/einer/pdf-Datei.pdf>
			$result4 = preg_replace_callback( $Expr, function ($match) {
					//error_log(__METHOD__.__LINE__.array2string($match));
					$match += [null,null,null,null];
					if (!empty($match[4]) && $match[4]===';' && (strlen($match[3])-4) >=0 && strpos($match[3],'&gt',strlen($match[3])-4)!==false)
					{
						$match[3] = substr($match[3],0,strpos($match[3],'&gt',strlen($match[3])-4));
						$match[4] = "&gt;";
					}
					if (!empty($match[4]) && $match[4]===';' && $match[3]=="&gt")
					{
						$match[3] ='';
						$match[4] = "&gt;";
					}
					//error_log(__METHOD__.__LINE__.array2string($match));
					return $match[1]."<a href=\"https://www".$match[2].$match[3]."\" target=\"_blank\">"."www".$match[2].$match[3]."</a>".($match[4]??'');
				}, $result3 );
		}
		return $result4;
	}

	/**
	 * escapes chars with special meaning in html as entities
	 *
	 * Allows to use and char in the html-output and prevents XSS attacks.
	 * Some entities are allowed and get NOT escaped: -> prevented by 4th param = doubleencode=false
	 * - &# some translations (AFAIK: the arabic ones) need this;
	 * - &nbsp; &lt; &gt; for convenience -> should not happen anymore, as we do not doubleencode anymore (20101020)
	 *
	 * @param string $str string to escape
	 * @param boolean $double_encoding =false do we want double encoding or not, default no
	 * @return string
	 */
	static function htmlspecialchars($str, $double_encoding=false)
	{
		return htmlspecialchars($str,ENT_COMPAT,Translation::charset(),$double_encoding);
	}

	/**
	 * allows to show and select one item from an array
	 *
	 * @param string $name	string with name of the submitted var which holds the key of the selected item form array
	 * @param string|array $key key(s) of already selected item(s) from $arr, eg. '1' or '1,2' or array with keys
	 * @param array $arr array with items to select, eg. $arr = array ( 'y' => 'yes','n' => 'no','m' => 'maybe');
	 * @param boolean $no_lang NOT run the labels of the options through lang(), default false=use lang()
	 * @param string $options additional options (e.g. 'width')
	 * @param int $multiple number of lines for a multiselect, default 0 = no multiselect, < 0 sets size without multiple
	 * @param boolean $enhanced Use enhanced selectbox with search.  Null for default yes if more than 12 options.
	 * @return string to set for a template or to echo into html page
	 */
	static function select($name, $key, $arr=0,$no_lang=false,$options='',$multiple=0,$enhanced=null)
	{
		if(is_null($enhanced)) $enhanced = false;	//disabled by default (count($arr) > self::SELECT_ENHANCED_ROW_COUNT);

		if (!is_array($arr))
		{
			$arr = array('no','yes');
		}
		if ((int)$multiple > 0)
		{
			$options .= ' multiple="1" size="'.(int)$multiple.'"';
			if (substr($name,-2) != '[]')
			{
				$name .= '[]';
			}
		}
		elseif((int)$multiple < 0)
		{
			$options .= ' size="'.abs($multiple).'"';
		}
		// fix width for MSIE < 9 in/for selectboxes
		if (Header\UserAgent::type() == 'msie' && Header\UserAgent::version() < 9)
		{
			if (stripos($options,'onfocus="') === false)
			{
				$options .= ' onfocus="window.dropdown_menu_hack(this);" ';
			}
			else
			{
				$options = str_ireplace('onfocus="','onfocus="window.dropdown_menu_hack(this);',$options);
			}
		}
		$out = "<select name=\"$name\" $options>\n";

		if (!is_array($key))
		{
			// explode on ',' only if multiple values expected and the key contains just numbers and commas
			$key = $multiple > 0 && preg_match('/^[,0-9]+$/',$key) ? explode(',',$key) : array($key);
		}
		foreach($arr as $k => $data)
		{
			if (!is_array($data) || count($data) == 2 && isset($data['label']) && isset($data['title']))
			{
				$out .= self::select_option($k,is_array($data)?$data['label']:$data,$key,$no_lang,
					is_array($data)?$data['title']:'');
			}
			else
			{
				if (isset($data['lable']))
				{
					$k = $data['lable'];
					unset($data['lable']);
				}
				$out .= '<optgroup label="'.self::htmlspecialchars($no_lang || $k == '' ? $k : lang($k))."\">\n";

				foreach($data as $k => $label)
				{
					$out .= self::select_option($k,is_array($label)?$label['label']:$label,$key,$no_lang,
						is_array($label)?$label['title']:'');
				}
				$out .= "</optgroup>\n";
			}
		}
		$out .= "</select>\n";

		if($enhanced) {
			Framework::includeJS('/api/js/jquery/chosen/chosen.jquery.js');
			Framework::includeCSS('/api/js/jquery/chosen/chosen.css',null,false);
			$out .= "<script>var lab = egw_LAB || \$LAB; lab.wait(function() {jQuery(function() {if(jQuery().chosen) jQuery('select[name=\"$name\"]').chosen({width: '100%'});});})</script>\n";
		}
		return $out;
	}

	/**
	 * emulating a multiselectbox using checkboxes
	 *
	 * Unfortunaly this is not in all aspects like a multi-selectbox, eg. you cant select options via javascript
	 * in the same way. Therefor I made it an extra function.
	 *
	 * @param string $name	string with name of the submitted var which holds the key of the selected item form array
	 * @param string|array $key key(s) of already selected item(s) from $arr, eg. '1' or '1,2' or array with keys
	 * @param array $arr array with items to select, eg. $arr = array ( 'y' => 'yes','n' => 'no','m' => 'maybe');
	 * @param boolean $no_lang NOT run the labels of the options through lang(), default false=use lang()
	 * @param string $options additional options (e.g. 'width')
	 * @param int $multiple number of lines for a multiselect, default 3
	 * @param boolean $selected_first show the selected items before the not selected ones, default true
	 * @param string $style ='' extra style settings like "width: 100%", default '' none
	 * @return string to set for a template or to echo into html page
	 */
	static function checkbox_multiselect($name, $key, $arr=0,$no_lang=false,$options='',$multiple=3,$selected_first=true,$style='',$enhanced = null)
	{
		//echo "<p align=right>checkbox_multiselect('$name',".array2string($key).",".array2string($arr).",$no_lang,'$options',$multiple,$selected_first,'$style')</p>\n";
		if(is_null($enhanced)) $enhanced = (count($arr) > self::SELECT_ENHANCED_ROW_COUNT);

		if (!is_array($arr))
		{
			$arr = array('no','yes');
		}
		if ((int)$multiple <= 0) $multiple = 1;

		if (substr($name,-2) != '[]')
		{
			$name .= '[]';
		}
		$base_name = substr($name,0,-2);

		if($enhanced) return self::select($name, $key, $arr,$no_lang,$options." style=\"$style\" ",$multiple,$enhanced);

		if (!is_array($key))
		{
			// explode on ',' only if multiple values expected and the key contains just numbers and commas
			$key = preg_match('/^[,0-9]+$/',$key) ? explode(',',$key) : array($key);
		}
		$html = '';
		$options_no_id = preg_replace('/id="[^"]+"/i','',$options);

		if ($selected_first)
		{
			$selected = $not_selected = array();
			foreach($arr as $val => $label)
			{
				if (in_array((string)$val,$key))
				{
					$selected[$val] = $label;
				}
				else
				{
					$not_selected[$val] = $label;
				}
			}
			$arr = $selected + $not_selected;
		}
		$max_len = 0;
		foreach($arr as $val => $label)
		{
			if (is_array($label))
			{
				$title = $label['title'];
				$label = $label['label'];
			}
			else
			{
				$title = '';
			}
			if ($label && !$no_lang) $label = lang($label);
			if ($title && !$no_lang) $title = lang($title);

			if (strlen($label) > $max_len) $max_len = strlen($label);

			$html .= self::label(self::checkbox($name,in_array((string)$val,$key),$val,$options_no_id.
				' id="'.$base_name.'['.$val.']'.'"').self::htmlspecialchars($label),
				$base_name.'['.$val.']','',($title ? 'title="'.self::htmlspecialchars($title).'" ':''))."<br />\n";
		}
		if ($style && substr($style,-1) != ';') $style .= '; ';
		if (strpos($style,'height')===false) $style .= 'height: '.(1.7*$multiple).'em; ';
		if (strpos($style,'width')===false)  $style .= 'width: '.(4+$max_len*($max_len < 15 ? 0.65 : 0.6)).'em; ';
		$style .= 'background-color: white; overflow: auto; border: lightgray 2px inset; text-align: left;';

		return self::div($html,$options,'',$style);
	}

	/**
	 * generates an option-tag for a selectbox
	 *
	 * @param string $value value
	 * @param string $label label
	 * @param mixed $selected value or array of values of options to mark as selected
	 * @param boolean $no_lang NOT running the label through lang(), default false=use lang()
	 * @param string $extra extra text, e.g.: style="", default: ''
	 * @return string html
	 */
	static function select_option($value,$label,$selected,$no_lang=0,$title='',$extra='')
	{
		// the following compares strict as strings, to archive: '0' == 0 != ''
		// the first non-strict search via array_search, is for performance reasons, to not always search the whole array with php
		if (($found = ($key = array_search($value,$selected)) !== false) && (string) $value !== (string) $selected[$key])
		{
			$found = false;
			foreach($selected as $sel)
			{
				if (($found = (((string) $value) === ((string) $selected[$key])))) break;
			}
			unset($sel);
		}
		return '<option value="'.self::htmlspecialchars($value).'"'.($found  ? ' selected="selected"' : '') .
			($title ? ' title="'.self::htmlspecialchars($no_lang ? $title : lang($title)).'"' : '') .
			($extra ? ' ' . $extra : '') . '>'.
			self::htmlspecialchars($no_lang || $label == '' ? $label : lang($label)) . "</option>\n";
	}

	/**
	 * generates a div-tag
	 *
	 * @param string $content of a div, or '' to generate only the opening tag
	 * @param string $options to include in the tag, default ''=none
	 * @param string $class css-class attribute, default ''=none
	 * @param string $style css-styles attribute, default ''=none
	 * @return string html
	 */
	static function div($content,$options='',$class='',$style='')
	{
		if ($class) $options .= ' class="'.$class.'"';
		if ($style) $options .= ' style="'.$style.'"';

		return "<div $options>\n".($content ? "$content</div>\n" : '');
	}

	/**
	 * generate one or more hidden input tag(s)
	 *
	 * @param array|string $vars var-name or array with name / value pairs
	 * @param string $value value if $vars is no array, default ''
	 * @param boolean $ignore_empty if true all empty, zero (!) or unset values, plus filer=none
	 * @param string html
	 */
	static function input_hidden($vars,$value='',$ignore_empty=True)
	{
		if (!is_array($vars))
		{
			$vars = array( $vars => $value );
		}
		foreach($vars as $name => $value)
		{
			if (is_array($value))
			{
				$value = json_encode($value);
			}
			if (!$ignore_empty || $value && !($name == 'filter' && $value == 'none'))	// dont need to send all the empty vars
			{
				$html .= "<input type=\"hidden\" name=\"$name\" value=\"".self::htmlspecialchars($value)."\" />\n";
			}
		}
		return $html;
	}

	/**
	 * generate a textarea tag
	 *
	 * @param string $name name attr. of the tag
	 * @param string $value default
	 * @param boolean $ignore_empty if true all empty, zero (!) or unset values, plus filer=none
	 * @param boolean $double_encoding =false do we want double encoding or not, default no
	 * @param string html
	 */
	static function textarea($name,$value='',$options='',$double_encoding=false)
	{
		return "<textarea name=\"$name\" $options>".self::htmlspecialchars($value,$double_encoding)."</textarea>\n";
	}

	/**
	 * Checks if HTMLarea (or an other richtext editor) is availible for the used browser
	 *
	 * @return boolean
	 */
	static function htmlarea_availible()
	{
		// this one is for testing how it will turn out, if you do not have the device or agent ready at your fingertips
		// if (stripos($_SERVER[HTTP_USER_AGENT],'mozilla') !== false) return false;
		return true;
	}

	/**
	 * compability static function for former used htmlarea. Please use static function fckeditor now!
	 *
	 * creates a textarea inputfield for the htmlarea js-widget (returns the necessary html and js)
	 */
	static function htmlarea($name,$content='',$style='',$base_href=''/*,$plugins='',$custom_toolbar='',$set_width_height_in_config=false*/)
	{
		/*if (!self::htmlarea_availible())
		{
			return self::textarea($name,$content,'style="'.$style.'"');
		}*/
		return self::fckEditor($name, $content, $style, array('toolbar_expanded' =>'true'), '400px', '100%', $base_href);
	}

	/**
	* this static function is a wrapper for fckEditor to create some reuseable layouts
	*
	* @param string $_name name and id of the input-field
	* @param string $_content of the tinymce (will be run through htmlspecialchars !!!), default ''
	* @param string $_mode display mode of the tinymce editor can be: simple, extended or advanced
	* @param array  $_options (toolbar_expanded true/false)
	* @param string $_height ='400px'
	* @param string $_width ='100%'
	* @param string $_start_path ='' if passed activates the browser for image at absolute path passed
	* @param boolean $_purify =true run $_content through htmlpurifier before handing it to fckEditor
	* @param mixed (boolean/string) $_focusToBody=false USED only for CKEDIOR true means yes, focus on top, you may specify TOP or BOTTOM (to focus on the end of the editor area)
	* @param string $_executeJSAfterInit ='' Javascript to be executed after InstanceReady of CKEditor
	* @return string the necessary html for the textarea
	* @deprecated use eTemplate2
	*/
	static function fckEditor($_name, $_content, $_mode, $_options=array('toolbar_expanded' =>'true'),
		$_height='400px', $_width='100%',$_start_path='',$_purify=true, $_focusToBody=false, $_executeJSAfterInit='')
	{
		return self::textarea($_name, $_content, 'style="width: ' . $_width . '; height: ' . $_height . ';" id="' . htmlspecialchars($_name) . '"');
	}

	/**
	* this static function is a wrapper for tinymce to create some reuseable layouts
	*
	* Please note: if you did not run init_tinymce already you this static function need to be called before the call to phpgw_header() !!!
	*
	* @param string $_name name and id of the input-field
	* @param string $_mode display mode of the tinymce editor can be: simple, extended or advanced
	* @param string $_content ='' of the tinymce (will be run through htmlspecialchars !!!), default ''
	* @param string $_height ='400px'
	* @param string $_width ='100%'
	* @param boolean $_purify =true
	* @param string $_border ='0px' NOT used for CKEditor
	* @param mixed (boolean/string) $_focusToBody=false USED only for CKEDIOR true means yes, focus on top, you may specify TOP or BOTTOM (to focus on the end of the editor area)
	* @param string $_executeJSAfterInit ='' Javascript to be executed after InstanceReady of CKEditor
    * @deprecated use eTemplate2
	* @return string the necessary html for the textarea
	*/
	static function fckEditorQuick($_name, $_mode, $_content='', $_height='400px', $_width='100%',$_purify=true, $_border='0px',$_focusToBody=false,$_executeJSAfterInit='')
	{
		if (!self::htmlarea_availible() || $_mode == 'ascii')
		{
			//TODO: use self::textarea
			return "<textarea name=\"$_name\" style=\"".($_width?" width:".$_width.';':" width:100%;").($_height?" height:".$_height.';':" height:400px;").($_border?" border:".$_border.';':" border:0px;")."\">$_content</textarea>";
		}
		else
		{
			return self::fckEditor($_name, $_content, $_mode, array(), $_height, $_width,'',$_purify,$_focusToBody,$_executeJSAfterInit);
		}
	}

	/**
	 * represents html's input tag
	 *
	 * @param string $name name
	 * @param string $value default value of the field
	 * @param string $type type, default ''=not specified = text
	 * @param string $options attributes for the tag, default ''=none
	 */
	static function input($name,$value='',$type='',$options='' )
	{
		switch ((string)$type)
		{
			case '';
				break;
			default:
				$type = 'type="'.htmlspecialchars($type).'"';
		}
		return "<input $type name=\"$name\" value=\"".self::htmlspecialchars($value)."\" $options />\n";
	}

	static protected $default_background_images = array(
		'save'   => '/save(&|\]|$)/',
		'apply'  => '/apply(&|\]|$)/',
		'cancel' => '/cancel(&|\]|$)/',
		'delete' => '/delete(&|\]|$)/',
		'edit'   => '/edit(&|\]|$)/',
		'next'   => '/(next|continue)(&|\]|$)/',
		'finish' => '/finish(&|\]|$)/',
		'back'   => '/(back|previous)(&|\]|$)/',
		'copy'   => '/copy(&|\]|$)/',
		'more'   => '/more(&|\]|$)/',
		'check'  => '/(yes|check)(&|\]|$)/',
		'cancelled' => '/no(&|\]|$)/',
		'ok'     => '/ok(&|\]|$)/',
		'close'  => '/close(&|\]|$)/',
		'add'    => '/(add(&|\]|$)|create)/',	// customfields use create*
	);

	static protected $default_classes = array(
		'et2_button_cancel'   => '/cancel(&|\]|$)/',	// yellow
		'et2_button_question' => '/(yes|no)(&|\]|$)/',	// yellow
		'et2_button_delete'   => '/delete(&|\]|$)/'		// red
	);

	/**
	 * represents html's button (input type submit or input type button or image)
	 *
	 * @param string $name name
	 * @param string $label label of the button
	 * @param string $onClick javascript to call, when button is clicked
	 * @param boolean $no_lang NOT running the label through lang(), default false=use lang()
	 * @param string $options attributes for the tag, default ''=none
	 * @param string $image to show instead of the label, default ''=none
	 * @param string $app app to search the image in
	 * @param string $buttontype which type of html button (button|submit), default ='submit'
	 * @return string html
	 */
	static function submit_button($name,$label,$onClick='',$no_lang=false,$options='',$image='',$app='phpgwapi', $buttontype='submit')
	{
		// workaround for idots and IE button problem (wrong cursor-image)
		if (Header\UserAgent::type() == 'msie')
		{
			$options .= ' style="cursor: pointer;"';
		}
		// add et2_classes to "old" buttons
		$classes = array('et2_button');

		if ($image != '')
		{
			$image = str_replace(array('.gif','.GIF','.png','.PNG'),'',$image);

			if (!($path = Image::find($app, $image)))
			{
				$path = $image;		// name may already contain absolut path
			}
			$image = ' src="'.$path.'"';
			$classes[] = 'image_button';
		}
		if (!$no_lang)
		{
			$label = lang($label);
		}
		if (($accesskey = @strstr($label,'&')) && $accesskey[1] != ' ' &&
			(($pos = strpos($accesskey,';')) === false || $pos > 5))
		{
			$label_u = str_replace('&'.$accesskey[1],'<u>'.$accesskey[1].'</u>',$label);
			$label = str_replace('&','',$label);
			$options .= ' accesskey="'.$accesskey[1].'" '.$options;
		}
		else
		{
			$accesskey = '';
			$label_u = $label;
		}
		if ($onClick) $options .= ' onclick="'.str_replace('"','\\"',$onClick).'"';

		// add default background-image to get et2 like buttons
		foreach(self::$default_background_images as $img => $reg_exp)
		{
			if (preg_match($reg_exp, $name) && ($url = Image::find($GLOBALS['egw_info']['flags']['currentapp'], $img)))
			{
				$options .= ' style="background-image: url('.$url.');"';
				$classes[] = 'et2_button_with_image et2_button_text';
				break;
			}
		}
		// add default class for cancel, delete or yes/no buttons
		foreach(self::$default_classes as $class => $reg_exp)
		{
			if (preg_match($reg_exp, $name))
			{
				$classes[] = $class;
				break;
			}
		}
		if (strpos($options, 'class="') !== false)
		{
			$options = str_replace('class="', 'class="'.implode(' ', $classes).' ', $options);
		}
		else
		{
			$options .= ' class="'.implode(' ', $classes).'"';
		}

		return '<button type="'.$buttontype.'" name="'.htmlspecialchars($name).
			'" value="'.htmlspecialchars($label).
			'" '.$options.'>'.
			($image != '' ? '<img'.$image.' title="'.self::htmlspecialchars($label).'"> ' : '').
			($image == '' || $accesskey ? self::htmlspecialchars($label_u) : '').'</button>';
	}

	/**
	 * creates an absolut link + the query / get-variables
	 *
	 * Example link('/index.php?menuaction=infolog.uiinfolog.get_list',array('info_id' => 123))
	 *	gives 'http://domain/phpgw-path/index.php?menuaction=infolog.uiinfolog.get_list&info_id=123'
	 *
	 * @param string $_url egw-relative link, may include query / get-vars
	 * @param array|string $vars query or array ('name' => 'value', ...) with query
	 * @return string absolut link already run through $phpgw->link
	 */
	static function link($_url,$vars='')
	{
		if (!is_array($vars))
		{
			parse_str($vars,$vars);
		}
		list($url,$v) = explode('?', $_url)+[null,null];	// url may contain additional vars
		if ($v)
		{
			parse_str($v,$v);
			$vars += $v;
		}
		if (preg_match('#^https?://#', $url))
		{
			return $url.($vars ? '?'.http_build_query($vars) : '');
		}
		return Framework::link($url,$vars);
	}

	/**
	 * represents html checkbox
	 *
	 * @param string $name name
	 * @param boolean $checked box checked on display
	 * @param string $value value the var should be set to, default 'True'
	 * @param string $options attributes for the tag, default ''=none
	 * @return string html
	 */
	static function checkbox($name,$checked=false,$value='True',$options='')
	{
		return '<input type="checkbox" name="'.$name.'" value="'.self::htmlspecialchars($value).'"' .($checked ? ' checked="1"' : '') . "$options />\n";
	}

	/**
	 * represents a html form
	 *
	 * @param string $content of the form, if '' only the opening tag gets returned
	 * @param array $hidden_vars array with name-value pairs for hidden input fields
	 * @param string $_url eGW relative URL, will be run through the link function, if empty the current url is used
	 * @param string|array $url_vars parameters for the URL, send to link static function too
	 * @param string $name name of the form, defaul ''=none
	 * @param string $options attributes for the tag, default ''=none
	 * @param string $method method of the form, default 'POST'
	 * @return string html
	 */
	static function form($content,$hidden_vars,$_url,$url_vars='',$name='',$options='',$method='POST')
	{
		$url = $_url ? self::link($_url, $url_vars) : $_SERVER['PHP_SELF'].'?'.$_SERVER['QUERY_STRING'];
		$html = "<form method=\"$method\" ".($name != '' ? "name=\"$name\" " : '')."action=\"$url\" $options>\n";
		$html .= self::input_hidden($hidden_vars);

		if ($content)
		{
			$html .= $content;
			$html .= "</form>\n";
		}
		return $html;
	}

	/**
	 * represents a html form with one button
	 *
	 * @param string $name name of the button
	 * @param string $label label of the button
	 * @param array $hidden_vars array with name-value pairs for hidden input fields
	 * @param string $url eGW relative URL, will be run through the link function
	 * @param string|array $url_vars parameters for the URL, send to link static function too
	 * @param string $options attributes for the tag, default ''=none
	 * @param string $form_name name of the form, defaul ''=none
	 * @param string $method method of the form, default 'POST'
	 * @return string html
	 */
	static function form_1button($name,$label,$hidden_vars,$url,$url_vars='',$form_name='',$method='POST')
	{
		return self::form(self::submit_button($name,$label),$hidden_vars,$url,$url_vars,$form_name,' style="display: inline-block"',$method);
	}

	const THEAD = 1;
	const TFOOT = 2;
	const TBODY = 3;
	static $part2tag = array(
		self::THEAD => 'thead',
		self::TFOOT => 'tfoot',
		self::TBODY => 'tbody',
	);

	/**
	 * creates table from array of rows
	 *
	 * abstracts the html stuff for the table creation
	 * Example: $rows = array (
	 *  'h1' => array(	// optional header row(s)
	 *  ),
	 *  'f1' => array(	// optional footer row(s)
	 *  ),
	 *	'1'  => array(
	 *		1 => 'cell1', '.1' => 'colspan=3',
	 *		2 => 'cell2',
	 *		3 => 'cell3', '.3' => 'width="10%"'
	 *	),'.1' => 'BGCOLOR="#0000FF"' );
	 *	table($rows,'width="100%"') = '<table width="100%"><tr><td colspan=3>cell1</td><td>cell2</td><td width="10%">cell3</td></tr></table>'
	 *
	 * @param array $rows with rows, each row is an array of the cols
	 * @param string $options options for the table-tag
	 * @param boolean $no_table_tr dont return the table- and outmost tr-tabs, default false=return table+tr
	 * @return string with html-code of the table
	 */
	static function table($rows,$options = '',$no_table_tr=False)
	{
		$html = $no_table_tr ? '' : "<table $options>\n";

		$part = 0;
		foreach($rows as $key => $row)
		{
			if (!is_array($row))
			{
				continue;					// parameter
			}
			// get the current part from the optional 'h' or 'f' prefix of the key
			$p = $key[0] == 'h' ? self::THEAD : ($key[0] == 'f' ? self::TFOOT : self::TBODY);
			if ($part < $p && ($part || $p < self::TBODY))	// add only allowed and neccessary transitions
			{
				if ($part) $html .= '</'.self::$part2tag[$part].">\n";
				$html .= '<'.self::$part2tag[$part=$p].">\n";
			}
			$html .= $no_table_tr && $key == 1 ? '' : "\t<tr ".$rows['.'.$key].">\n";

			foreach($row as $key => $cell)
			{
				if ($key[0] == '.')
				{
					continue;				// parameter
				}
				$table_pos = strpos($cell,'<table');
				$td_pos = strpos($cell,'<td');
				if ($td_pos !== False && ($table_pos === False || $td_pos < $table_pos))
				{
					$html .= $cell;
				}
				else
				{
					$html .= "\t\t<td ".$row['.'.$key].">$cell</td>\n";
				}
			}
			$html .= "\t</tr>\n";
		}
		if (!is_array($rows))
		{
			echo "<p>".function_backtrace()."</p>\n";
		}
		if ($part)	// close current part
		{
			$html .= "</".self::$part2tag[$part].">\n";
		}
		$html .= "</table>\n";

		if ($no_table_tr)
		{
			$html = substr($html,0,-16);
		}
		return $html;
	}

	/**
	 * changes a selectbox to submit the form if it gets changed, to be used with the sbox-class
	 *
	 * @param string $sbox html with the select-box
	 * @param boolean $no_script if true generate a submit-button if javascript is off
	 * @return string html
	 */
	static function sbox_submit( $sbox,$no_script=false )
	{
		$html = str_replace('<select','<select onchange="this.form.submit()" ',$sbox);
		if ($no_script)
		{
			$html .= '<noscript>'.self::submit_button('send','>').'</noscript>';
		}
		return $html;
	}

	/**
	 * html-widget showing progessbar with a view div's (html4 only, textual percentage otherwise)
	 *
	 * @param mixed $_percent percent-value, gets casted to int
	 * @param string $_title title for the progressbar, default ''=the percentage itself
	 * @param string $options attributes for the outmost div (may include onclick="...")
	 * @param string $width width, default 30px
	 * @param string $color color, default '#D00000' (dark red)
	 * @param string $height height, default 5px
	 * @return string html
	 */
	static function progressbar($_percent, $_title='',$options='',$width='',$color='',$height='' )
	{
		$percent = (int)$_percent;
		if (!$width) $width = '30px';
		if (!$height)$height= '5px';
		if (!$color) $color = '#D00000';
		$title = $_title ? self::htmlspecialchars($_title) : $percent.'%';

		return '<div class="onlyPrint">'.$title.'</div><div class="noPrint" title="'.$title.'" '.$options.
			' style="height: '.$height.'; width: '.$width.'; border: 1px solid black; padding: 1px; text-align: left;'.
			(@stristr($options,'onclick="') ? ' cursor: pointer;' : '').'">'."\n\t".
			'<div style="height: '.$height.'; width: '.$percent.'%; background: '.$color.';"></div>'."\n</div>\n";
	}

	/**
	 * representates a html img tag, output a picture
	 *
	 * If the name ends with a '%' and the rest is numeric, a progressionbar is shown instead of an image.
	 * The vfs:/ pseudo protocoll allows to access images in the vfs, eg. vfs:/home/ralf/me.png
	 * Instead of a name you specify an array with get-vars, it is passed to eGW's link function.
	 * This way session-information gets passed, eg. $name=array('menuaction'=>'myapp.class.image','id'=>123).
	 *
	 * @param string $app app-name to search the image
	 * @param string|array $name image-name or URL (incl. vfs:/) or array with get-vars
	 * @param string $title tooltip, default '' = none
	 * @param string $options further options for the tag, default '' = none
	 * @return string the html
	 */
	static function image( $app,$name,$title='',$options='' )
	{
		if (is_array($name))	// menuaction and other get-vars
		{
			$name = $GLOBALS['egw']->link('/index.php',$name);
		}
		if (substr($name,0,5) == 'vfs:/')	// vfs pseudo protocoll
		{
			$name = Framework::link(Vfs::download_url(substr($name,4)));
		}
		if ($name[0] == '/' || substr($name,0,7) == 'http://' || substr($name,0,8) == 'https://' || stripos($name,'api/thumbnail.php') )
		{
			if (!($name[0] == '/' || substr($name,0,7) == 'http://' || substr($name,0,8) == 'https://')) $name = '/'.$name;
			$url = $name;
		}
		else	// no URL, so try searching the image
		{
			$name = str_replace(array('.gif','.GIF','.png','.PNG'),'',$name);

			if (!($url = Image::find($app,$name)))
			{
				$url = $name;		// name may already contain absolut path
			}
			if($GLOBALS['egw_info']['server']['webserver_url'])
			{
				list(,$path) = explode($GLOBALS['egw_info']['server']['webserver_url'],$url);

				if (!is_null($path)) $path = EGW_SERVER_ROOT.$path;
			}
			else
			{
				$path = EGW_SERVER_ROOT.$url;
			}

			if (is_null($path) || (!@is_readable($path) && stripos($path,'webdav.php')===false))
			{
				// if the image-name is a percentage, use a progressbar
				if (substr($name,-1) == '%' && is_numeric($percent = substr($name,0,-1)))
				{
					return self::progressbar($percent,$title);
				}
				return $title;
			}
		}
		if ($title)
		{
			$options .= ' title="'.self::htmlspecialchars($title).'"';
		}

		// This block makes pngfix.js useless, adding a check on disable_pngfix to have pngfix.js do its thing
		if (Header\UserAgent::type() == 'msie' && Header\UserAgent::version() < 7.0 && substr($url,-4) == '.png' && ($GLOBALS['egw_info']['user']['preferences']['common']['disable_pngfix'] || !isset($GLOBALS['egw_info']['user']['preferences']['common']['disable_pngfix'])))
		{
			$extra_styles = "display: inline-block; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='$url',sizingMethod='image'); width: 1px; height: 1px;";
			if (false!==strpos($options,'style="'))
			{
				$options = str_replace('style="','style="'.$extra_styles, $options);
			}
			else
			{
				$options .= ' style="'.$extra_styles.'"';
			}
			return "<span $options></span>";
		}
		return "<img src=\"$url\" $options />";
	}

	/**
	 * representates a html link
	 *
	 * @param string $content of the link, if '' only the opening tag gets returned
	 * @param string $url eGW relative URL, will be run through the link function
	 * @param string|array $vars parameters for the URL, send to link static function too
	 * @param string $options attributes for the tag, default ''=none
	 * @return string the html
	 */
	static function a_href( $content,$url,$vars='',$options='')
	{
		if (is_array($url))
		{
			$vars = $url;
			$url = '/index.php';
		}
		elseif (strpos($url,'/')===false &&
			count(explode('.',$url)) >= 3 &&
			!(strpos($url,'mailto:')!==false ||
			strpos($url,'://')!==false ||
			strpos($url,'javascript:')!==false))
		{
			$url = "/index.php?menuaction=$url";
		}
		if ($url[0] == '/')		// link relative to eGW
		{
			$url = self::link($url,$vars);
		}
		//echo "<p>self::a_href('".self::htmlspecialchars($content)."','$url',".print_r($vars,True).") = ".self::link($url,$vars)."</p>";
		return '<a href="'.self::htmlspecialchars($url).'" '.$options.'>'.$content.'</a>';
	}

	/**
	 * representates a b tag (bold)
	 *
	 * @param string $content of the link, if '' only the opening tag gets returned
	 * @return string the html
	 */
	static function bold($content)
	{
		return '<b>'.($content?$content.'</b>':'');
	}

	/**
	 * representates a hr tag (horizontal rule)
	 *
	 * @param string $width default ''=none given
	 * @param string $options attributes for the tag, default ''=none
	 * @return string the html
	 */
	static function hr($width='',$options='')
	{
		if ($width) $options .= " width=\"$width\"";

		return "<hr $options />\n";
	}

	/**
	 * formats option-string for most of the above functions
	 *
	 * Example: formatOptions('100%,,1','width,height,border') = ' width="100%" border="1"'
	 *
	 * @param mixed $options String (or Array) with option-values eg. '100%,,1'
	 * @param mixed $names String (or Array) with the option-names eg. 'WIDTH,HEIGHT,BORDER'
	 * @return string with options/attributes
	 */
	static function formatOptions($options,$names)
	{
		if (!is_array($options)) $options = explode(',',$options);
		if (!is_array($names))   $names   = explode(',',$names);

		foreach($options as $n => $val)
		{
			if ($val != '' && $names[$n] != '')
			{
				$html .= ' '.strtolower($names[$n]).'="'.$val.'"';
			}
		}
		return $html;
	}

	/**
	 * html style tag (incl. type)
	 *
	 * @param string $styles css-style definitions
	 * @return string html
	 */
	static function style($styles)
	{
		return $styles ? "<style type=\"text/css\">\n<!--\n$styles\n-->\n</style>" : '';
	}

	/**
	 * html label tag
	 *
	 * @param string $content the label
	 * @param string $id for the for attribute, default ''=none
	 * @param string $accesskey accesskey, default ''=none
	 * @param string $options attributes for the tag, default ''=none
	 * @return string the html
	 */
	static function label($content,$id='',$accesskey='',$options='')
	{
		if ($id != '')
		{
			$id = " for=\"$id\"";
		}
		if ($accesskey != '')
		{
			$accesskey = " accesskey=\"$accesskey\"";
		}
		return "<label$id$accesskey $options>$content</label>";
	}

	/**
	 * html fieldset, eg. groups a group of radiobuttons
	 *
	 * @param string $content the content
	 * @param string $legend legend / label of the fieldset, default ''=none
	 * @param string $options attributes for the tag, default ''=none
	 * @return string the html
	 */
	static function fieldset($content,$legend='',$options='')
	{
		$html = "<fieldset $options>".($legend ? '<legend>'.self::htmlspecialchars($legend).'</legend>' : '')."\n";

		if ($content)
		{
			$html .= $content;
			$html .= "\n</fieldset>\n";
		}
		return $html;
	}

	/**
	 * tree widget using dhtmlXtree
	 *
	 * Code inspired by Lars's Felamimail uiwidgets::createFolderTree()
	 *
	 * @author Lars Kneschke <lars-AT-kneschke.de> original code in felamimail
	 * @param array $_folders array of folders: pairs path => node (string label or array with keys: label, (optional) image, (optional) title, (optional) checked)
	 * @param string $_selected path of selected folder
	 * @param mixed $_topFolder =false node of topFolder or false for none
	 * @param string $_onNodeSelect ='alert' js static function to call if node gets selected
	 * @param string $tree ='foldertree' id of the div and name of the variable containing the tree object
	 * @param string $_divClass ='' css class of the div
	 * @param string $_leafImage ='' default image of a leaf-node, ''=default of foldertree, set it eg. 'folderClosed.gif' to show leafs as folders
	 * @param boolean|string $_onCheckHandler =false string with handler-name to display a checkbox for each folder, or false (default), 'null' switches checkboxes on without an handler!
	 * @param string $delimiter ='/' path-delimiter, default /
	 * @param string $folderImageDir =null string path to the tree menu images, null uses default path
	 * @param string|array $autoLoading =null EGw relative path or array with get parameter, both send through Framework::link
	 * @param string $dataMode ='JSON' data type for autoloading: XML, JSON, CSV
	 * @param boolean $dragndrop =false true to enable drag-n-drop (must be before autoloading get enabled!)
	 *
	 * @deprecated the used DHTML tree is no longer part of EGroupware, please use eTemplate2 and it's et2-tree widget
	 * @return string the html code, to be added into the template
	 */
	static function tree($_folders,$_selected,$_topFolder=false,$_onNodeSelect="null",$tree='foldertree',$_divClass='',
		$_leafImage='',$_onCheckHandler=false,$delimiter='/',$folderImageDir=null,$autoLoading=null,$dataMode='JSON',
		$dragndrop=false)
	{
		return '';
	}

	/**
	 * Runs HTMLPurifier over supplied html to remove malicious code
	 *
	 * @param string $html
	 * @param array|string $config =null - config to influence the behavior of current purifying engine
	 * @param array|string $spec =null - spec to influence the behavior of current purifying engine
	 *		The $spec argument can be used to disallow an otherwise legal attribute for an element,
	 *		or to restrict the attribute's values
	 * @param boolean $_force =null - force the config passed to be used without merging to the default
	 */
	static function purify($html,$config=null,$spec=array(),$_force=false)
	{
		return Html\HtmLawed::purify($html, $config, $spec, $_force);
	}
}