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<?php
namespace andreskrey\Readability;
class Readability implements ReadabilityInterface
{
/**
* @var int
*/
protected $score = 0;
/**
* @var null
*/
protected $node;
/**
* @var array
*/
private $regexps = [
'positive' => '/article|body|content|entry|hentry|h-entry|main|page|pagination|post|text|blog|story/i',
'negative' => '/hidden|^hid$| hid$| hid |^hid |banner|combx|comment|com-|contact|foot|footer|footnote|masthead|media|meta|modal|outbrain|promo|related|scroll|share|shoutbox|sidebar|skyscraper|sponsor|shopping|tags|tool|widget/i',
];
/**
* Constructor.
*
* @param DOMElement $node
*/
public function __construct($node)
{
$this->node = $node;
}
/**
* Initializer. Calculates the current score of the node and returns a full Readability object.
*
* @return Readability
*/
public function initializeNode()
{
switch ($this->node->getTagName()) {
case 'div':
$this->score += 5;
break;
case 'pre':
case 'td':
case 'blockquote':
$this->score += 3;
break;
case 'address':
case 'ol':
case 'ul':
case 'dl':
case 'dd':
case 'dt':
case 'li':
case 'form':
$this->score -= 3;
break;
case 'h1':
case 'h2':
case 'h3':
case 'h4':
case 'h5':
case 'h6':
case 'th':
$this->score -= 5;
break;
}
$this->score += $this->getClassWeight();
return $this;
}
/**
* Calculates the weight of the class/id of the current element.
*
* @todo check for flag that lets this function run or not
*
* @return int
*/
public function getClassWeight()
{
// if(!Config::FLAG_WEIGHT_CLASSES) return 0;
$weight = 0;
// Look for a special classname
$class = $this->node->getAttribute('class');
if (trim($class)) {
if (preg_match($this->regexps['negative'], $class)) {
$weight -= 25;
}
if (preg_match($this->regexps['positive'], $class)) {
$weight += 25;
}
}
// Look for a special ID
$id = $this->node->getAttribute('class');
if (trim($id)) {
if (preg_match($this->regexps['negative'], $id)) {
$weight -= 25;
}
if (preg_match($this->regexps['positive'], $id)) {
$weight += 25;
}
}
return $weight;
}
/**
* Returns the current score of the Readability object.
*
* @return int
*/
public function getScore()
{
return $this->score;
}
}
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