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<?php
namespace andreskrey\Readability;
use DOMDocument;
class HTMLParser
{
private $dom = null;
private $metadata = [];
private $title = [];
private $elementsToScore = [];
private $regexps = [
'unlikelyCandidates' => '/banner|combx|comment|community|disqus|extra|foot|header|menu|modal|related|remark|rss|share|shoutbox|sidebar|skyscraper|sponsor|ad-break|agegate|pagination|pager|popup/i',
'okMaybeItsACandidate' => '/and|article|body|column|main|shadow/i',
'extraneous' => '/print|archive|comment|discuss|e[\-]?mail|share|reply|all|login|sign|single|utility/i',
'byline' => '/byline|author|dateline|writtenby|p-author/i',
'replaceFonts' => '/<(\/?)font[^>]*>/gi',
'normalize' => '/\s{2,}/g',
'videos' => '/\/\/(www\.)?(dailymotion|youtube|youtube-nocookie|player\.vimeo)\.com/i',
'nextLink' => '/(next|weiter|continue|>([^\|]|$)|»([^\|]|$))/i',
'prevLink' => '/(prev|earl|old|new|<|«)/i',
'whitespace' => '/^\s*$/',
'hasContent' => '/\S$/'
];
public function __construct()
{
$this->dom = new DOMDocument('1.0', 'utf-8');
libxml_use_internal_errors(true);
}
public function parse($html)
{
$this->loadHTML($html);
$this->removeScripts();
$this->metadata = $this->getMetadata();
$this->title = $this->getTitle();
if (!($root = $this->dom->getElementsByTagName('body')->item(0))) {
throw new \InvalidArgumentException('Invalid HTML was provided');
}
$root = new DOMElement($root);
$this->getNodes($root);
$this->rateNodes($this->elementsToScore);
}
private function loadHTML($html)
{
$this->dom->loadHTML($html);
$this->dom->encoding = 'utf-8';
}
private function removeScripts()
{
while ($script = $this->dom->getElementsByTagName('script')) {
if ($script->item(0)) {
$script->item(0)->parentNode->removeChild($script->item(0));
} else {
break;
}
}
}
private function getMetadata()
{
$metadata = [];
foreach ($this->dom->getElementsByTagName('meta') as $meta) {
$name = $meta->getAttribute('name');
$property = $meta->getAttribute('property');
$item = ($name ? $name : $property);
if ($item == 'og:title' || $item == 'twitter:title') {
$metadata['title'] = $meta->getAttribute('content');
}
if ($item == 'og:description' || $item == 'twitter:description') {
$metadata['excerpt'] = $meta->getAttribute('content');
}
if ($item == 'author') {
$metadata['byline'] = $meta->getAttribute('content');
}
}
return $metadata;
}
private function getTitle()
{
if (isset($this->metadata['title'])) {
return $this->metadata['title'];
}
$title = $this->dom->getElementsByTagName('title');
if ($title) {
return $title->item(0)->nodeValue;
}
return null;
}
private function getNodes(DOMElementInterface $node)
{
$matchString = $node->getAttribute('class') . ' ' . $node->getAttribute('id');
if (
preg_match($this->regexps['unlikelyCandidates'], $matchString) &&
!preg_match($this->regexps['okMaybeItsACandidate'], $matchString) &&
!$node->tagNameEqualsTo('body') &&
!$node->tagNameEqualsTo('a')
) {
return;
}
if ($node->hasChildren()) {
foreach ($node->getChildren() as $child) {
$this->getNodes($child);
}
}
if ($node->hasSinglePNode()) {
$pNode = $node->getChildren();
$node = $pNode[0];
}
if (trim($node->getValue())) {
$this->elementsToScore[] = $node;
}
}
/**
* @param array $nodes
*/
private function rateNodes($nodes)
{
$candidates = [];
foreach ($nodes as $node) {
if (strlen($node->getValue()) < 25) {
continue;
}
$ancestors = $node->getNodeAncestors();
if ($ancestors < 3) {
continue;
}
// Start with a point for the paragraph itself as a base.
$contentScore = 1;
// Add points for any commas within this paragraph.
$contentScore += count(explode(', ', $node->getValue()));
// For every 100 characters in this paragraph, add another point. Up to 3 points.
$contentScore += min(floor(strlen($node->getValue()) / 100), 3);
foreach ($ancestors as $ancestor) {
$readability = new Readability($ancestor);
$candidates[] = $readability->initializeNode();
}
}
}
}
|
