%PDF-
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<?php
/**
* Html2Pdf Library - parsing Html class
*
* HTML => PDF converter
* distributed under the OSL-3.0 License
*
* @package Html2pdf
* @author Laurent MINGUET <webmaster@html2pdf.fr>
* @copyright 2017 Laurent MINGUET
*/
namespace Spipu\Html2Pdf\Parsing;
use Spipu\Html2Pdf\Exception\HtmlParsingException;
/**
* Class TagParser
*/
class TagParser
{
protected $level; // table level
protected $num = 0; // table number
protected $textParser;
public function __construct(TextParser $textParser)
{
$this->textParser = $textParser;
$this->level = array($this->num);
}
/**
* analyze a HTML tag
*
* @param string $code HTML code to analyze
*
* @return Node corresponding action
* @throws HtmlParsingException
*/
public function analyzeTag($code)
{
// name of the tag, opening, closure, autoclosure
$tag = '<([\/]{0,1})([_a-z0-9]+)([\/>\s]+)';
if (!preg_match('/'.$tag.'/isU', $code, $match)) {
$e = new HtmlParsingException('The HTML tag ['.$code.'] provided is invalid');
$e->setInvalidTag($code);
throw $e;
}
$close = ($match[1] === '/' ? true : false);
$autoclose = preg_match('/\/>$/isU', $code);
$name = strtolower($match[2]);
// required parameters (depends on the tag name)
$defaultParams = array();
$defaultParams['style'] = '';
if ($name === 'img') {
$defaultParams['alt'] = '';
$defaultParams['src'] = '';
} elseif ($name === 'a') {
$defaultParams['href'] = '';
}
$param = array_merge($defaultParams, $this->extractTagAttributes($code));
$param['style'] = trim($param['style']);
if (strlen($param['style']) > 0 && substr($param['style'], -1) !== ';') {
$param['style'].= ';';
}
// compliance of each parameter
$color = "#000000";
$border = null;
foreach ($param as $key => $val) {
switch ($key) {
case 'width':
unset($param[$key]);
$param['style'] .= 'width: '.$val.'px; ';
break;
case 'align':
if ($name === 'img') {
unset($param[$key]);
$param['style'] .= 'float: '.$val.'; ';
} elseif ($name !== 'table') {
unset($param[$key]);
$param['style'] .= 'text-align: '.$val.'; ';
}
break;
case 'valign':
unset($param[$key]);
$param['style'] .= 'vertical-align: '.$val.'; ';
break;
case 'height':
unset($param[$key]);
$param['style'] .= 'height: '.$val.'px; ';
break;
case 'bgcolor':
unset($param[$key]);
$param['style'] .= 'background: '.$val.'; ';
break;
case 'bordercolor':
unset($param[$key]);
$color = $val;
break;
case 'border':
unset($param[$key]);
if (preg_match('/^[0-9]+$/isU', $val)) {
$val = $val.'px';
}
$border = $val;
break;
case 'cellpadding':
case 'cellspacing':
if (preg_match('/^([0-9]+)$/isU', $val)) {
$param[$key] = $val.'px';
}
break;
case 'colspan':
case 'rowspan':
$val = preg_replace('/[^0-9]/isU', '', $val);
if (!$val) {
$val = 1;
}
$param[$key] = (int) $val;
break;
case 'color':
if ($name === 'font') {
unset($param[$key]);
$param['style'] .= 'color: '.$val.'; ';
}
break;
}
}
// compliance of the border
if ($border !== null) {
if ($border && $border !== '0px') {
$border = 'solid '.$border.' '.$color;
} else {
$border = 'none';
}
$param['style'] .= 'border: '.$border.'; ';
$param['border'] = $border;
}
// reading styles: decomposition and standardization
$styles = explode(';', $param['style']);
$param['style'] = array();
foreach ($styles as $style) {
$tmp = explode(':', $style);
if (count($tmp) > 1) {
$cod = $tmp[0];
unset($tmp[0]);
$tmp = implode(':', $tmp);
$param['style'][trim(strtolower($cod))] = preg_replace('/[\s]+/isU', ' ', trim($tmp));
}
}
// determining the level of table opening, with an added level
if (in_array($name, array('ul', 'ol', 'table')) && !$close) {
$this->num++;
array_push($this->level, $this->num);
}
// get the level of the table containing the element
if (!isset($param['num'])) {
$param['num'] = end($this->level);
}
// for closures table: remove a level
if (in_array($name, array('ul', 'ol', 'table')) && $close) {
array_pop($this->level);
}
// prepare the parameters
if (isset($param['value'])) {
$keepSpaces = in_array($name, array('qrcode', 'barcode'));
$param['value'] = $this->textParser->prepareTxt($param['value'], !$keepSpaces);
}
if (isset($param['alt'])) {
$param['alt'] = $this->textParser->prepareTxt($param['alt']);
}
if (isset($param['title'])) {
$param['title'] = $this->textParser->prepareTxt($param['title']);
}
if (isset($param['class'])) {
$param['class'] = $this->textParser->prepareTxt($param['class']);
}
// return the new action to do
return new Node($name, $param, $close, $autoclose);
}
/**
* Extract the list of attribute => value inside an HTML tag
*
* @param string $code The full HTML tag to parse
*
* @return array
*/
public function extractTagAttributes($code)
{
$param = array();
$regexes = array(
'([a-zA-Z0-9_]+)=([^"\'\s>]+)', // read the parameters : name=value
'([a-zA-Z0-9_]+)=["]([^"]*)["]', // read the parameters : name="value"
"([a-zA-Z0-9_]+)=[']([^']*)[']" // read the parameters : name='value'
);
foreach ($regexes as $regex) {
preg_match_all('/'.$regex.'/is', $code, $match);
$amountMatch = count($match[0]);
for ($k = 0; $k < $amountMatch; $k++) {
$param[trim(strtolower($match[1][$k]))] = trim($match[2][$k]);
}
}
return $param;
}
}
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