HtmlTag.php
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<?php
/**
* @package Regular Labs Library
* @version 18.2.10140
*
* @author Peter van Westen <info@regularlabs.com>
* @link http://www.regularlabs.com
* @copyright Copyright © 2018 Regular Labs All Rights Reserved
* @license http://www.gnu.org/licenses/gpl-2.0.html GNU/GPL
*/
namespace RegularLabs\Library;
defined('_JEXEC') or die;
/**
* Class HtmlTag
* @package RegularLabs\Library
*/
class HtmlTag
{
/**
* Combine 2 opening html tags into one
*
* @param string $tag1
* @param string $tag2
*
* @return string
*/
public static function combine($tag1, $tag2)
{
// Return if tags are the same
if ($tag1 == $tag2)
{
return $tag1;
}
if ( ! RegEx::match('<([a-z][a-z0-9]*)', $tag1, $tag_type))
{
return $tag2;
}
$tag_type = $tag_type[1];
if ( ! $attribs = self::combineAttributes($tag1, $tag2))
{
return '<' . $tag_type . '>';
}
return '<' . $tag_type . ' ' . $attribs . '>';
}
/**
* Extract attribute value from a html tag string by given attribute key
*
* @param string $key
* @param string $string
*
* @return string
*/
public static function getAttributeValue($key, $string)
{
if (empty($key) || empty($string))
{
return '';
}
RegEx::match(RegEx::quote($key) . '="([^"]*)"', $string, $match);
if (empty($match))
{
return '';
}
return $match[1];
}
/**
* Extract all attributes from a html tag string
*
* @param string $string
*
* @return array
*/
public static function getAttributes($string)
{
if (empty($string))
{
return [];
}
RegEx::matchAll('([a-z0-9-_]+)="([^"]*)"', $string, $matches);
if (empty($matches))
{
return [];
}
$attribs = [];
foreach ($matches as $match)
{
$attribs[$match[1]] = $match[2];
}
return $attribs;
}
/**
* Combine attribute values from 2 given html tag strings (or arrays of attributes)
* And return as a sting of attributes
*
* @param string /array $string1
* @param string /array $string2
*
* @return string
*/
public static function combineAttributes($string1, $string2)
{
$attribsutes1 = is_array($string1) ? $string1 : self::getAttributes($string1);
$attribsutes2 = is_array($string2) ? $string2 : self::getAttributes($string2);
$duplicate_attributes = array_intersect_key($attribsutes1, $attribsutes2);
// Fill $attributes with the unique ids
$attributes = array_diff_key($attribsutes1, $attribsutes2) + array_diff_key($attribsutes2, $attribsutes1);
// List of attrubute types that can only contain one value
$single_value_attributes = ['id', 'href'];
// Add/combine the duplicate ids
foreach ($duplicate_attributes as $key => $val)
{
if (in_array($key, $single_value_attributes))
{
$attributes[$key] = $attribsutes2[$key];
continue;
}
// Combine strings, but remove duplicates
// "aaa bbb" + "aaa ccc" = "aaa bbb ccc"
// use a ';' as a concatenated for javascript values (keys beginning with 'on')
// Otherwise use a space (like for classes)
$glue = substr($key, 0, 2) == 'on' ? ';' : ' ';
$attributes[$key] = implode($glue, array_merge(explode($glue, $attribsutes1[$key]), explode($glue, $attribsutes2[$key])));
}
return self::flattenAttributes($attributes);
}
/**
* Convert array of attributes to a html style string
*
* @param array $attributes
*
* @return string
*/
public static function flattenAttributes($attributes)
{
foreach ($attributes as $key => &$val)
{
$val = $key . '="' . $val . '"';
}
return implode(' ', $attributes);
}
}