html.php
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html.php
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	<?php

	/**
	+-----------------------------------------------------------------------+
	\| This file is part of the Roundcube Webmail client \|
	\| \|
	\| Copyright (C) The Roundcube Dev Team \|
	\| \|
	\| Licensed under the GNU General Public License version 3 or \|
	\| any later version with exceptions for skins & plugins. \|
	\| See the README file for a full license statement. \|
	\| \|
	\| PURPOSE: \|
	\| Helper class to create valid XHTML code \|
	+-----------------------------------------------------------------------+
	\| Author: Thomas Bruederli <roundcube@gmail.com> \|
	+-----------------------------------------------------------------------+
	*/

	/**
	* Class for HTML code creation
	*
	* @package Framework
	* @subpackage View
	*/
	class html
	{
	protected $tagname;
	protected $content;
	protected $attrib = [];
	protected $allowed = [];

	public static $doctype = 'xhtml';
	public static $lc_tags = true;
	public static $common_attrib = ['id','class','style','title','align','unselectable','tabindex','role'];
	public static $containers = ['iframe','div','span','p','h1','h2','h3','ul','form','textarea','table','thead','tbody','tr','th','td','style','script','a'];
	public static $bool_attrib = ['checked','multiple','disabled','selected','autofocus','readonly','required'];


	/**
	* Constructor
	*
	* @param array $attrib Hash array with tag attributes
	*/
	public function __construct($attrib = [])
	{
	if (is_array($attrib)) {
	$this->attrib = $attrib;
	}
	}

	/**
	* Return the tag code
	*
	* @return string The finally composed HTML tag
	*/
	public function show()
	{
	return self::tag($this->tagname, $this->attrib, $this->content, array_merge(self::$common_attrib, $this->allowed));
	}

	/**** STATIC METHODS *****/

	/**
	* Generic method to create a HTML tag
	*
	* @param string $tagname Tag name
	* @param array $attrib Tag attributes as key/value pairs
	* @param string $content Optional Tag content (creates a container tag)
	* @param array $allowed List with allowed attributes, omit to allow all
	*
	* @return string The XHTML tag
	*/
	public static function tag($tagname, $attrib = [], $content = null, $allowed = null)
	{
	if (is_string($attrib)) {
	$attrib = ['class' => $attrib];
	}

	$inline_tags = ['a', 'span', 'img'];
	$suffix = (isset($attrib['nl']) && $content && $attrib['nl'] && !in_array($tagname, $inline_tags)) ? "\n" : '';

	$tagname = self::$lc_tags ? strtolower($tagname) : $tagname;
	if (isset($content) \|\| in_array($tagname, self::$containers)) {
	$suffix = !empty($attrib['noclose']) ? $suffix : '</' . $tagname . '>' . $suffix;
	unset($attrib['noclose'], $attrib['nl']);
	return '<' . $tagname . self::attrib_string($attrib, $allowed) . '>' . $content . $suffix;
	}
	else {
	return '<' . $tagname . self::attrib_string($attrib, $allowed) . '>' . $suffix;
	}
	}

	/**
	* Return DOCTYPE tag of specified type
	*
	* @param string $type Document type (html5, xhtml, 'xhtml-trans, xhtml-strict)
	*/
	public static function doctype($type)
	{
	$doctypes = [
	'html5' => '<!DOCTYPE html>',
	'xhtml' => '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">',
	'xhtml-trans' => '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">',
	'xhtml-strict' => '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">',
	];

	if (!empty($doctypes[$type])) {
	self::$doctype = preg_replace('/-\w+$/', '', $type);
	return $doctypes[$type];
	}

	return '';
	}

	/**
	* Derived method for <div> containers
	*
	* @param mixed $attr Hash array with tag attributes or string with class name
	* @param string $cont Div content
	*
	* @return string HTML code
	* @see html::tag()
	*/
	public static function div($attr = null, $cont = null)
	{
	if (is_string($attr)) {
	$attr = ['class' => $attr];
	}

	return self::tag('div', $attr, $cont, array_merge(self::$common_attrib, ['onclick']));
	}

	/**
	* Derived method for <p> blocks
	*
	* @param mixed $attr Hash array with tag attributes or string with class name
	* @param string $cont Paragraph content
	*
	* @return string HTML code
	* @see html::tag()
	*/
	public static function p($attr = null, $cont = null)
	{
	if (is_string($attr)) {
	$attr = ['class' => $attr];
	}

	return self::tag('p', $attr, $cont, self::$common_attrib);
	}

	/**
	* Derived method to create <img />
	*
	* @param string\|array $attr Hash array with tag attributes or string with image source (src)
	*
	* @return string HTML code
	* @see html::tag()
	*/
	public static function img($attr = null)
	{
	if (is_string($attr)) {
	$attr = ['src' => $attr];
	}

	$allowed = ['src','alt','width','height','border','usemap','onclick','onerror','onload'];

	return self::tag('img', $attr + ['alt' => ''], null, array_merge(self::$common_attrib, $allowed));
	}

	/**
	* Derived method for link tags
	*
	* @param string\|array $attr Hash array with tag attributes or string with link location (href)
	* @param string $cont Link content
	*
	* @return string HTML code
	* @see html::tag()
	*/
	public static function a($attr, $cont)
	{
	if (is_string($attr)) {
	$attr = ['href' => $attr];
	}

	$allowed = ['href','target','name','rel','onclick','onmouseover','onmouseout','onmousedown','onmouseup'];

	return self::tag('a', $attr, $cont, array_merge(self::$common_attrib, $allowed));
	}

	/**
	* Derived method for inline span tags
	*
	* @param string\|array $attr Hash array with tag attributes or string with class name
	* @param string $cont Tag content
	*
	* @return string HTML code
	* @see html::tag()
	*/
	public static function span($attr, $cont)
	{
	if (is_string($attr)) {
	$attr = ['class' => $attr];
	}

	return self::tag('span', $attr, $cont, self::$common_attrib);
	}

	/**
	* Derived method for form element labels
	*
	* @param string\|array $attr Hash array with tag attributes or string with 'for' attrib
	* @param string $cont Tag content
	*
	* @return string HTML code
	* @see html::tag()
	*/
	public static function label($attr, $cont)
	{
	if (is_string($attr)) {
	$attr = ['for' => $attr];
	}

	return self::tag('label', $attr, $cont, array_merge(self::$common_attrib, ['for','onkeypress']));
	}

	/**
	* Derived method to create <iframe></iframe>
	*
	* @param string\|array $attr Hash array with tag attributes or string with frame source (src)
	* @param string $cont Tag content
	*
	* @return string HTML code
	* @see html::tag()
	*/
	public static function iframe($attr = null, $cont = null)
	{
	if (is_string($attr)) {
	$attr = ['src' => $attr];
	}

	$allowed = ['src','name','width','height','border','frameborder','onload','allowfullscreen'];

	return self::tag('iframe', $attr, $cont, array_merge(self::$common_attrib, $allowed));
	}

	/**
	* Derived method to create <script> tags
	*
	* @param string\|array $attr Hash array with tag attributes or string with script source (src)
	* @param string $cont Javascript code to be placed as tag content
	*
	* @return string HTML code
	* @see html::tag()
	*/
	public static function script($attr, $cont = null)
	{
	if (is_string($attr)) {
	$attr = ['src' => $attr];
	}

	if ($cont) {
	if (self::$doctype == 'xhtml') {
	$cont = "/* <![CDATA[ /\n{$cont}\n/ ]]> */";
	}

	$cont = "\n{$cont}\n";
	}

	if (self::$doctype == 'xhtml') {
	$attr += ['type' => 'text/javascript'];
	}

	return self::tag('script', $attr + ['nl' => true], $cont,
	array_merge(self::$common_attrib, ['src', 'type', 'charset']));
	}

	/**
	* Derived method for line breaks
	*
	* @param array $attrib Associative array with tag attributes
	*
	* @return string HTML code
	* @see html::tag()
	*/
	public static function br($attrib = [])
	{
	return self::tag('br', $attrib);
	}

	/**
	* Create string with attributes
	*
	* @param array $attrib Associative array with tag attributes
	* @param array $allowed List of allowed attributes
	*
	* @return string Valid attribute string
	*/
	public static function attrib_string($attrib = [], $allowed = null)
	{
	if (empty($attrib)) {
	return '';
	}

	$allowed_f = array_flip((array) $allowed);
	$attrib_arr = [];

	foreach ($attrib as $key => $value) {
	// skip size if not numeric
	if ($key == 'size' && !is_numeric($value)) {
	continue;
	}

	// ignore "internal" or empty attributes
	if ($key == 'nl' \|\| $value === null) {
	continue;
	}

	// ignore not allowed attributes, except aria-* and data-*
	if (!empty($allowed)) {
	$is_data_attr = @substr_compare($key, 'data-', 0, 5) === 0;
	$is_aria_attr = @substr_compare($key, 'aria-', 0, 5) === 0;
	if (!$is_aria_attr && !$is_data_attr && !isset($allowed_f[$key])) {
	continue;
	}
	}

	// skip empty eventhandlers
	if (preg_match('/^on[a-z]+/', $key) && !$value) {
	continue;
	}

	// attributes with no value
	if (in_array($key, self::$bool_attrib)) {
	if (!empty($value)) {
	$value = $key;
	if (self::$doctype == 'xhtml') {
	$value .= '="' . $value . '"';
	}

	$attrib_arr[] = $value;
	}
	}
	else {
	$attrib_arr[] = $key . '="' . self::quote((string) $value) . '"';
	}
	}

	return count($attrib_arr) ? ' '.implode(' ', $attrib_arr) : '';
	}

	/**
	* Convert a HTML attribute string attributes to an associative array (name => value)
	*
	* @param string $str Input string
	*
	* @return array Key-value pairs of parsed attributes
	*/
	public static function parse_attrib_string($str)
	{
	$attrib = [];
	$html = '<html>'
	. '<head><meta http-equiv="Content-Type" content="text/html; charset=' . RCUBE_CHARSET . '" /></head>'
	. '<body><div ' . rtrim($str, '/ ') . ' /></body>'
	. '</html>';

	$document = new DOMDocument('1.0', RCUBE_CHARSET);
	@$document->loadHTML($html);

	if ($node = $document->getElementsByTagName('div')->item(0)) {
	foreach ($node->attributes as $name => $attr) {
	$attrib[strtolower($name)] = $attr->nodeValue;
	}
	}

	return $attrib;
	}

	/**
	* Replacing specials characters in html attribute value
	*
	* @param string $str Input string
	*
	* @return string The quoted string
	*/
	public static function quote($str)
	{
	// PHP8 does not like e.g. an array as htmlspecialchars() argument
	if (!is_string($str)) {
	return (string) $str;
	}

	return @htmlspecialchars($str, ENT_COMPAT \| ENT_SUBSTITUTE, RCUBE_CHARSET);
	}
	}


	/**
	* Class to create an HTML input field
	*
	* @package Framework
	* @subpackage View
	*/
	class html_inputfield extends html
	{
	protected $tagname = 'input';
	protected $type = 'text';
	protected $allowed = [
	'type','name','value','size','tabindex','autocapitalize','required',
	'autocomplete','checked','onchange','onclick','disabled','readonly',
	'spellcheck','results','maxlength','src','multiple','accept',
	'placeholder','autofocus','pattern','oninput'
	];

	/**
	* Object constructor
	*
	* @param array $attrib Associative array with tag attributes
	*/
	public function __construct($attrib = [])
	{
	if (is_array($attrib)) {
	$this->attrib = $attrib;
	}

	if (!empty($attrib['type'])) {
	$this->type = $attrib['type'];
	}
	}

	/**
	* Compose input tag
	*
	* @param string $value Field value
	* @param array $attrib Additional attributes to override
	*
	* @return string HTML output
	*/
	public function show($value = null, $attrib = null)
	{
	// overwrite object attributes
	if (is_array($attrib)) {
	$this->attrib = array_merge($this->attrib, $attrib);
	}

	// set value attribute
	if ($value !== null) {
	$this->attrib['value'] = $value;
	}
	// set type
	$this->attrib['type'] = $this->type;

	return parent::show();
	}
	}

	/**
	* Class to create an HTML password field
	*
	* @package Framework
	* @subpackage View
	*/
	class html_passwordfield extends html_inputfield
	{
	protected $type = 'password';
	}

	/**
	* Class to create an hidden HTML input field
	*
	* @package Framework
	* @subpackage View
	*/
	class html_hiddenfield extends html
	{
	protected $tagname = 'input';
	protected $type = 'hidden';
	protected $allowed = ['type','name','value','onchange','disabled','readonly'];
	protected $fields = [];

	/**
	* Constructor
	*
	* @param array $attrib Named tag attributes
	*/
	public function __construct($attrib = null)
	{
	if (is_array($attrib)) {
	$this->add($attrib);
	}
	}

	/**
	* Add a hidden field to this instance
	*
	* @param array $attrib Named tag attributes
	*/
	public function add($attrib)
	{
	$this->fields[] = $attrib;
	}

	/**
	* Create HTML code for the hidden fields
	*
	* @return string Final HTML code
	*/
	public function show()
	{
	$out = '';

	foreach ($this->fields as $attrib) {
	$out .= self::tag($this->tagname, ['type' => $this->type] + $attrib);
	}

	return $out;
	}
	}

	/**
	* Class to create HTML checkboxes
	*
	* @package Framework
	* @subpackage View
	*/
	class html_checkbox extends html_inputfield
	{
	protected $type = 'checkbox';

	/**
	* Get HTML code for this object
	*
	* @param string $value Value of the checked field
	* @param array $attrib Additional attributes to override
	*
	* @return string HTML output
	*/
	public function show($value = '', $attrib = null)
	{
	// overwrite object attributes
	if (is_array($attrib)) {
	$this->attrib = array_merge($this->attrib, $attrib);
	}

	// set 'checked' attribute
	$this->attrib['checked'] = (string) $value === (string) ($this->attrib['value'] ?? '');

	return parent::show();
	}
	}

	/**
	* Class to create HTML radio buttons
	*
	* @package Framework
	* @subpackage View
	*/
	class html_radiobutton extends html_checkbox
	{
	protected $type = 'radio';
	}

	/**
	* Class to create HTML button
	*
	* @package Framework
	* @subpackage View
	*/
	class html_button extends html_inputfield
	{
	protected $tagname = 'button';
	protected $type = 'button';

	/**
	* Get HTML code for this object
	*
	* @param string $content Text Content of the button
	* @param array $attrib Additional attributes to override
	*
	* @return string HTML output
	*/
	public function show($content = '', $attrib = null)
	{
	// overwrite object attributes
	if (is_array($attrib)) {
	$this->attrib = array_merge($this->attrib, $attrib);
	}

	$this->content = $content;

	return parent::show();
	}
	}

	/**
	* Class to create an HTML textarea
	*
	* @package Framework
	* @subpackage View
	*/
	class html_textarea extends html
	{
	protected $tagname = 'textarea';
	protected $allowed = ['name','rows','cols','wrap','tabindex',
	'onchange','disabled','readonly','spellcheck'];

	/**
	* Get HTML code for this object
	*
	* @param string $value Textbox value
	* @param array $attrib Additional attributes to override
	*
	* @return string HTML output
	*/
	public function show($value = '', $attrib = null)
	{
	// overwrite object attributes
	if (is_array($attrib)) {
	$this->attrib = array_merge($this->attrib, $attrib);
	}

	// take value attribute as content
	if (empty($value) && !empty($this->attrib['value'])) {
	$value = $this->attrib['value'];
	}

	// make shure we don't print the value attribute
	if (isset($this->attrib['value'])) {
	unset($this->attrib['value']);
	}

	if (!empty($value) && empty($this->attrib['is_escaped'])) {
	$value = self::quote($value);
	}

	return self::tag($this->tagname, $this->attrib, $value,
	array_merge(self::$common_attrib, $this->allowed));
	}
	}

	/**
	* Builder for HTML drop-down menus
	* Syntax:<pre>
	* // create instance. arguments are used to set attributes of select-tag
	* $select = new html_select(['name' => 'fieldname']);
	*
	* // add one option
	* $select->add('Switzerland', 'CH');
	*
	* // add multiple options
	* $select->add(['Switzerland','Germany'], ['CH','DE']);
	*
	* // generate pulldown with selection 'Switzerland' and return html-code
	* // as second argument the same attributes available to instantiate can be used
	* print $select->show('CH');
	* </pre>
	*
	* @package Framework
	* @subpackage View
	*/
	class html_select extends html
	{
	protected $tagname = 'select';
	protected $options = [];
	protected $allowed = ['name','size','tabindex','autocomplete',
	'multiple','onchange','disabled','rel'];

	/**
	* Add a new option to this drop-down
	*
	* @param mixed $names Option name or array with option names
	* @param mixed $values Option value or array with option values
	* @param array $attrib Additional attributes for the option entry
	*/
	public function add($names, $values = null, $attrib = [])
	{
	if (is_array($names)) {
	foreach ($names as $i => $text) {
	$this->options[] = [
	'text' => $text,
	'value' => $values[$i] ?? $i
	] + $attrib;
	}
	}
	else {
	$this->options[] = ['text' => $names, 'value' => $values] + $attrib;
	}
	}

	/**
	* Get HTML code for this object
	*
	* @param string $select Value of the selection option
	* @param array $attrib Additional attributes to override
	*
	* @return string HTML output
	*/
	public function show($select = [], $attrib = null)
	{
	// overwrite object attributes
	if (is_array($attrib)) {
	$this->attrib = array_merge($this->attrib, $attrib);
	}

	$this->content = "\n";
	$select = (array) $select;
	foreach ($this->options as $option) {
	$attr = [
	'value' => $option['value'],
	'selected' => (in_array($option['value'], $select, true) \|\|
	in_array($option['text'], $select, true)) ? 1 : null
	];

	$option_content = $option['text'];
	if (empty($this->attrib['is_escaped'])) {
	$option_content = self::quote($option_content);
	}

	$allowed = ['value','label','class','style','title','disabled','selected'];

	$this->content .= self::tag('option', $attr + $option, $option_content, $allowed);
	}

	return parent::show();
	}
	}

	/**
	* Class to build an HTML table
	*
	* @package Framework
	* @subpackage View
	*/
	class html_table extends html
	{
	protected $tagname = 'table';
	protected $allowed = ['id','class','style','width','summary',
	'cellpadding','cellspacing','border'];

	private $header = null;
	private $rows = [];
	private $rowindex = 0;
	private $colindex = 0;

	/**
	* Constructor
	*
	* @param array $attrib Named tag attributes
	*/
	public function __construct($attrib = [])
	{
	$default_attrib = self::$doctype == 'xhtml' ? ['border' => '0'] : [];
	$this->attrib = array_merge($attrib, $default_attrib);

	if (!empty($attrib['tagname']) && $attrib['tagname'] != 'table') {
	$this->tagname = $attrib['tagname'];
	$this->allowed = self::$common_attrib;
	}
	}

	/**
	* Add a table cell
	*
	* @param array $attr Cell attributes
	* @param string $cont Cell content
	*/
	public function add($attr, $cont)
	{
	if (is_string($attr)) {
	$attr = ['class' => $attr];
	}

	$cell = new stdClass;
	$cell->attrib = $attr;
	$cell->content = $cont;

	if (!isset($this->rows[$this->rowindex])) {
	$this->rows[$this->rowindex] = new stdClass;
	$this->rows[$this->rowindex]->attrib = [];
	}

	$this->rows[$this->rowindex]->cells[$this->colindex] = $cell;
	$this->colindex += max(1, isset($attr['colspan']) ? intval($attr['colspan']) : 0);

	if (!empty($this->attrib['cols']) && $this->colindex >= $this->attrib['cols']) {
	$this->add_row();
	}
	}

	/**
	* Add a table header cell
	*
	* @param string\|array $attr Cell attributes array or class name
	* @param string $cont Cell content
	*/
	public function add_header($attr, $cont)
	{
	if (is_string($attr)) {
	$attr = ['class' => $attr];
	}

	$cell = new stdClass;
	$cell->attrib = $attr;
	$cell->content = $cont;

	if (empty($this->header)) {
	$this->header = new stdClass;
	$this->header->attrib = [];
	}

	$this->header->cells[] = $cell;
	}

	/**
	* Remove a column from a table
	* Useful for plugins making alterations
	*
	* @param string $class Class name
	*/
	public function remove_column($class)
	{
	// Remove the header
	foreach ($this->header->cells as $index => $header) {
	if ($header->attrib['class'] == $class) {
	unset($this->header[$index]);
	break;
	}
	}

	// Remove cells from rows
	foreach ($this->rows as $i => $row) {
	foreach ($row->cells as $j => $cell) {
	if ($cell->attrib['class'] == $class) {
	unset($this->rows[$i]->cells[$j]);
	break;
	}
	}
	}
	}

	/**
	* Jump to next row
	*
	* @param array $attr Row attributes
	*/
	public function add_row($attr = [])
	{
	$this->rowindex++;
	$this->colindex = 0;
	$this->rows[$this->rowindex] = new stdClass;
	$this->rows[$this->rowindex]->attrib = $attr;
	$this->rows[$this->rowindex]->cells = [];
	}

	/**
	* Set header attributes
	*
	* @param string\|array $attr Row attributes array or class name
	*/
	public function set_header_attribs($attr = [])
	{
	if (is_string($attr)) {
	$attr = ['class' => $attr];
	}

	if (empty($this->header)) {
	$this->header = new stdClass;
	}

	$this->header->attrib = $attr;
	}

	/**
	* Set row attributes
	*
	* @param string\|array $attr Row attributes array or class name
	* @param int $index Optional row index (default current row index)
	*/
	public function set_row_attribs($attr = [], $index = null)
	{
	if (is_string($attr)) {
	$attr = ['class' => $attr];
	}

	if ($index === null) {
	$index = $this->rowindex;
	}

	// make sure row object exists (#1489094)
	if (empty($this->rows[$index])) {
	$this->rows[$index] = new stdClass;
	}

	$this->rows[$index]->attrib = $attr;
	}

	/**
	* Get row attributes
	*
	* @param int $index Row index
	*
	* @return array Row attributes
	*/
	public function get_row_attribs($index = null)
	{
	if ($index === null) {
	$index = $this->rowindex;
	}

	return !empty($this->rows[$index]) ? $this->rows[$index]->attrib : null;
	}

	/**
	* Build HTML output of the table data
	*
	* @param array $attrib Table attributes
	*
	* @return string The final table HTML code
	*/
	public function show($attrib = null)
	{
	if (is_array($attrib)) {
	$this->attrib = array_merge($this->attrib, $attrib);
	}

	$thead = '';
	$tbody = '';
	$col_tagname = $this->_col_tagname();
	$row_tagname = $this->_row_tagname();
	$head_tagname = $this->_head_tagname();

	// include <thead>
	if (!empty($this->header)) {
	$rowcontent = '';
	foreach ($this->header->cells as $c => $col) {
	$rowcontent .= self::tag($head_tagname, $col->attrib, $col->content);
	}
	$thead = $this->tagname == 'table' ? self::tag('thead', null, self::tag('tr', $this->header->attrib ?: null, $rowcontent, parent::$common_attrib)) :
	self::tag($row_tagname, ['class' => 'thead'], $rowcontent, parent::$common_attrib);
	}

	foreach ($this->rows as $r => $row) {
	$rowcontent = '';
	foreach ($row->cells as $c => $col) {
	if ($row_tagname == 'li' && empty($col->attrib) && count($row->cells) == 1) {
	$rowcontent .= $col->content;
	}
	else {
	$rowcontent .= self::tag($col_tagname, $col->attrib, $col->content);
	}
	}

	if ($r < $this->rowindex \|\| count($row->cells)) {
	$tbody .= self::tag($row_tagname, $row->attrib, $rowcontent, parent::$common_attrib);
	}
	}

	if (!empty($this->attrib['rowsonly'])) {
	return $tbody;
	}

	// add <tbody>
	$this->content = $thead . ($this->tagname == 'table' ? self::tag('tbody', null, $tbody) : $tbody);

	unset($this->attrib['cols'], $this->attrib['rowsonly']);

	return parent::show();
	}

	/**
	* Count number of rows
	*
	* @return int The number of rows
	*/
	public function size()
	{
	return count($this->rows);
	}

	/**
	* Remove table body (all rows)
	*/
	public function remove_body()
	{
	$this->rows = [];
	$this->rowindex = 0;
	}

	/**
	* Getter for the corresponding tag name for table row elements
	*/
	private function _row_tagname()
	{
	static $row_tagnames = ['table' => 'tr', 'ul' => 'li', '*' => 'div'];
	return !empty($row_tagnames[$this->tagname]) ? $row_tagnames[$this->tagname] : $row_tagnames['*'];
	}

	/**
	* Getter for the corresponding tag name for table row elements
	*/
	private function _head_tagname()
	{
	static $head_tagnames = ['table' => 'th', '*' => 'span'];
	return !empty($head_tagnames[$this->tagname]) ? $head_tagnames[$this->tagname] : $head_tagnames['*'];
	}

	/**
	* Getter for the corresponding tag name for table cell elements
	*/
	private function _col_tagname()
	{
	static $col_tagnames = ['table' => 'td', '*' => 'span'];
	return !empty($col_tagnames[$this->tagname]) ? $col_tagnames[$this->tagname] : $col_tagnames['*'];
	}
	}

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