mirror of https://tt-rss.org/git/tt-rss.git
1805 lines
66 KiB
PHP
1805 lines
66 KiB
PHP
<?php
|
|
|
|
namespace andreskrey\Readability;
|
|
|
|
use andreskrey\Readability\Nodes\DOM\DOMDocument;
|
|
use andreskrey\Readability\Nodes\DOM\DOMElement;
|
|
use andreskrey\Readability\Nodes\DOM\DOMNode;
|
|
use andreskrey\Readability\Nodes\DOM\DOMText;
|
|
use andreskrey\Readability\Nodes\NodeUtility;
|
|
use Psr\Log\LoggerInterface;
|
|
|
|
/**
|
|
* Class Readability.
|
|
*/
|
|
class Readability
|
|
{
|
|
/**
|
|
* Main DOMDocument where all the magic happens.
|
|
*
|
|
* @var DOMDocument
|
|
*/
|
|
protected $dom;
|
|
|
|
/**
|
|
* Title of the article.
|
|
*
|
|
* @var string|null
|
|
*/
|
|
protected $title = null;
|
|
|
|
/**
|
|
* Final DOMDocument with the fully parsed HTML.
|
|
*
|
|
* @var DOMDocument|null
|
|
*/
|
|
protected $content = null;
|
|
|
|
/**
|
|
* Excerpt of the article.
|
|
*
|
|
* @var string|null
|
|
*/
|
|
protected $excerpt = null;
|
|
|
|
/**
|
|
* Main image of the article.
|
|
*
|
|
* @var string|null
|
|
*/
|
|
protected $image = null;
|
|
|
|
/**
|
|
* Author of the article. Extracted from the byline tags and other social media properties.
|
|
*
|
|
* @var string|null
|
|
*/
|
|
protected $author = null;
|
|
|
|
/**
|
|
* Website name.
|
|
*
|
|
* @var string|null
|
|
*/
|
|
protected $siteName = null;
|
|
|
|
/**
|
|
* Direction of the text.
|
|
*
|
|
* @var string|null
|
|
*/
|
|
protected $direction = null;
|
|
|
|
/**
|
|
* Configuration object.
|
|
*
|
|
* @var Configuration
|
|
*/
|
|
private $configuration;
|
|
|
|
/**
|
|
* Logger object.
|
|
*
|
|
* @var LoggerInterface
|
|
*/
|
|
private $logger;
|
|
|
|
/**
|
|
* Collection of attempted text extractions.
|
|
*
|
|
* @var array
|
|
*/
|
|
private $attempts = [];
|
|
|
|
/**
|
|
* @var array
|
|
*/
|
|
private $defaultTagsToScore = [
|
|
'section',
|
|
'h2',
|
|
'h3',
|
|
'h4',
|
|
'h5',
|
|
'h6',
|
|
'p',
|
|
'td',
|
|
'pre',
|
|
];
|
|
|
|
/**
|
|
* @var array
|
|
*/
|
|
private $alterToDIVExceptions = [
|
|
'div',
|
|
'article',
|
|
'section',
|
|
'p',
|
|
];
|
|
|
|
/**
|
|
* Readability constructor.
|
|
*
|
|
* @param Configuration $configuration
|
|
*/
|
|
public function __construct(Configuration $configuration)
|
|
{
|
|
$this->configuration = $configuration;
|
|
$this->logger = $this->configuration->getLogger();
|
|
}
|
|
|
|
/**
|
|
* Main parse function.
|
|
*
|
|
* @param $html
|
|
*
|
|
* @throws ParseException
|
|
*
|
|
* @return bool
|
|
*/
|
|
public function parse($html)
|
|
{
|
|
$this->logger->info('*** Starting parse process...');
|
|
|
|
$this->dom = $this->loadHTML($html);
|
|
|
|
// Checking for minimum HTML to work with.
|
|
if (!($root = $this->dom->getElementsByTagName('body')->item(0)) || !$root->firstChild) {
|
|
$this->logger->emergency('No body tag present or body tag empty');
|
|
|
|
throw new ParseException('Invalid or incomplete HTML.');
|
|
}
|
|
|
|
$this->getMetadata();
|
|
|
|
$this->getMainImage();
|
|
|
|
while (true) {
|
|
$root = $root->firstChild;
|
|
|
|
$elementsToScore = $this->getNodes($root);
|
|
$this->logger->debug(sprintf('Elements to score: \'%s\'', count($elementsToScore)));
|
|
|
|
$result = $this->rateNodes($elementsToScore);
|
|
|
|
/*
|
|
* Now that we've gone through the full algorithm, check to see if
|
|
* we got any meaningful content. If we didn't, we may need to re-run
|
|
* grabArticle with different flags set. This gives us a higher likelihood of
|
|
* finding the content, and the sieve approach gives us a higher likelihood of
|
|
* finding the -right- content.
|
|
*/
|
|
|
|
$length = mb_strlen(preg_replace(NodeUtility::$regexps['onlyWhitespace'], '', $result->textContent));
|
|
|
|
$this->logger->info(sprintf('[Parsing] Article parsed. Amount of words: %s. Current threshold is: %s', $length, $this->configuration->getCharThreshold()));
|
|
|
|
if ($result && $length < $this->configuration->getCharThreshold()) {
|
|
$this->dom = $this->loadHTML($html);
|
|
$root = $this->dom->getElementsByTagName('body')->item(0);
|
|
|
|
if ($this->configuration->getStripUnlikelyCandidates()) {
|
|
$this->logger->debug('[Parsing] Threshold not met, trying again setting StripUnlikelyCandidates as false');
|
|
$this->configuration->setStripUnlikelyCandidates(false);
|
|
$this->attempts[] = ['articleContent' => $result, 'textLength' => $length];
|
|
} elseif ($this->configuration->getWeightClasses()) {
|
|
$this->logger->debug('[Parsing] Threshold not met, trying again setting WeightClasses as false');
|
|
$this->configuration->setWeightClasses(false);
|
|
$this->attempts[] = ['articleContent' => $result, 'textLength' => $length];
|
|
} elseif ($this->configuration->getCleanConditionally()) {
|
|
$this->logger->debug('[Parsing] Threshold not met, trying again setting CleanConditionally as false');
|
|
$this->configuration->setCleanConditionally(false);
|
|
$this->attempts[] = ['articleContent' => $result, 'textLength' => $length];
|
|
} else {
|
|
$this->logger->debug('[Parsing] Threshold not met, searching across attempts for some content.');
|
|
$this->attempts[] = ['articleContent' => $result, 'textLength' => $length];
|
|
|
|
// No luck after removing flags, just return the longest text we found during the different loops
|
|
usort($this->attempts, function ($a, $b) {
|
|
return $a['textLength'] < $b['textLength'];
|
|
});
|
|
|
|
// But first check if we actually have something
|
|
if (!$this->attempts[0]['textLength']) {
|
|
$this->logger->emergency('[Parsing] Could not parse text, giving up :(');
|
|
|
|
throw new ParseException('Could not parse text.');
|
|
}
|
|
|
|
$this->logger->debug('[Parsing] Threshold not met, but found some content in previous attempts.');
|
|
|
|
$result = $this->attempts[0]['articleContent'];
|
|
break;
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
$result = $this->postProcessContent($result);
|
|
|
|
// If we haven't found an excerpt in the article's metadata, use the article's
|
|
// first paragraph as the excerpt. This can be used for displaying a preview of
|
|
// the article's content.
|
|
if (!$this->getExcerpt()) {
|
|
$this->logger->debug('[Parsing] No excerpt text found on metadata, extracting first p node and using it as excerpt.');
|
|
$paragraphs = $result->getElementsByTagName('p');
|
|
if ($paragraphs->length > 0) {
|
|
$this->setExcerpt(trim($paragraphs->item(0)->textContent));
|
|
}
|
|
}
|
|
|
|
$this->setContent($result);
|
|
|
|
$this->logger->info('*** Parse successful :)');
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Creates a DOM Document object and loads the provided HTML on it.
|
|
*
|
|
* Used for the first load of Readability and subsequent reloads (when disabling flags and rescanning the text)
|
|
* Previous versions of Readability used this method one time and cloned the DOM to keep a backup. This caused bugs
|
|
* because cloning the DOM object keeps a relation between the clone and the original one, doing changes in both
|
|
* objects and ruining the backup.
|
|
*
|
|
* @param string $html
|
|
*
|
|
* @return DOMDocument
|
|
*/
|
|
private function loadHTML($html)
|
|
{
|
|
$this->logger->debug('[Loading] Loading HTML...');
|
|
|
|
// To avoid throwing a gazillion of errors on malformed HTMLs
|
|
libxml_use_internal_errors(true);
|
|
|
|
$dom = new DOMDocument('1.0', 'utf-8');
|
|
|
|
if (!$this->configuration->getSubstituteEntities()) {
|
|
// Keep the original HTML entities
|
|
$dom->substituteEntities = false;
|
|
}
|
|
|
|
if ($this->configuration->getNormalizeEntities()) {
|
|
$this->logger->debug('[Loading] Normalized entities via mb_convert_encoding.');
|
|
// Replace UTF-8 characters with the HTML Entity equivalent. Useful to fix html with mixed content
|
|
$html = mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8');
|
|
}
|
|
|
|
if ($this->configuration->getSummonCthulhu()) {
|
|
$this->logger->debug('[Loading] Removed script tags via regex H̶͈̩̟̬̱͠E̡̨̬͔̳̜͢͠ ̡̧̯͉̩͙̩̹̞̠͎͈̹̥̠͞ͅͅC̶͉̞̘̖̝̗͓̬̯͍͉̤̬͢͢͞Ò̟̘͉͖͎͉̱̭̣̕M̴̯͈̻̱̱̣̗͈̠̙̲̥͘͞E̷̛͙̼̲͍͕̹͍͇̗̻̬̮̭̱̥͢Ş̛̟͔̙̜̤͇̮͍̙̝̀͘');
|
|
$html = preg_replace('/<script\b[^>]*>([\s\S]*?)<\/script>/', '', $html);
|
|
}
|
|
|
|
// Prepend the XML tag to avoid having issues with special characters. Should be harmless.
|
|
$dom->loadHTML('<?xml encoding="UTF-8">' . $html);
|
|
$dom->encoding = 'UTF-8';
|
|
|
|
$this->removeScripts($dom);
|
|
|
|
$this->prepDocument($dom);
|
|
|
|
$this->logger->debug('[Loading] Loaded HTML successfully.');
|
|
|
|
return $dom;
|
|
}
|
|
|
|
/**
|
|
* Tries to guess relevant info from metadata of the html. Sets the results in the Readability properties.
|
|
*/
|
|
private function getMetadata()
|
|
{
|
|
$this->logger->debug('[Metadata] Retrieving metadata...');
|
|
|
|
$values = [];
|
|
// property is a space-separated list of values
|
|
$propertyPattern = '/\s*(dc|dcterm|og|twitter)\s*:\s*(author|creator|description|title|image|site_name)(?!:)\s*/i';
|
|
|
|
// name is a single value
|
|
$namePattern = '/^\s*(?:(dc|dcterm|og|twitter|weibo:(article|webpage))\s*[\.:]\s*)?(author|creator|description|title|image|site_name)(?!:)\s*$/i';
|
|
|
|
// Find description tags.
|
|
foreach ($this->dom->getElementsByTagName('meta') as $meta) {
|
|
/* @var DOMNode $meta */
|
|
$elementName = $meta->getAttribute('name');
|
|
$elementProperty = $meta->getAttribute('property');
|
|
$content = $meta->getAttribute('content');
|
|
$matches = null;
|
|
$name = null;
|
|
|
|
if ($elementProperty) {
|
|
if (preg_match($propertyPattern, $elementProperty, $matches)) {
|
|
for ($i = count($matches) - 1; $i >= 0; $i--) {
|
|
// Convert to lowercase, and remove any whitespace
|
|
// so we can match below.
|
|
$name = preg_replace('/\s/', '', mb_strtolower($matches[$i]));
|
|
// multiple authors
|
|
$values[$name] = trim($content);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!$matches && $elementName && preg_match($namePattern, $elementName)) {
|
|
$name = $elementName;
|
|
if ($content) {
|
|
// Convert to lowercase, remove any whitespace, and convert dots
|
|
// to colons so we can match below.
|
|
$name = preg_replace(['/\s/', '/\./'], ['', ':'], mb_strtolower($name));
|
|
$values[$name] = trim($content);
|
|
}
|
|
}
|
|
}
|
|
|
|
// get title
|
|
/*
|
|
* This is a very convoluted way of extracting the first matching key of the $values array
|
|
* against a set of options.
|
|
*
|
|
* This could be easily replaced with an ugly set of isset($values['key']) or a bunch of ??s.
|
|
* Will probably replace it with ??s after dropping support of PHP5.6
|
|
*/
|
|
$key = current(array_intersect([
|
|
'dc:title',
|
|
'dcterm:title',
|
|
'og:title',
|
|
'weibo:article:title',
|
|
'weibo:webpage:title',
|
|
'title',
|
|
'twitter:title'
|
|
], array_keys($values)));
|
|
|
|
$this->setTitle(isset($values[$key]) ? trim($values[$key]) : null);
|
|
|
|
if (!$this->getTitle()) {
|
|
$this->setTitle($this->getArticleTitle());
|
|
}
|
|
|
|
// get author
|
|
$key = current(array_intersect([
|
|
'dc:creator',
|
|
'dcterm:creator',
|
|
'author'
|
|
], array_keys($values)));
|
|
|
|
$this->setAuthor(isset($values[$key]) ? $values[$key] : null);
|
|
|
|
// get description
|
|
$key = current(array_intersect([
|
|
'dc:description',
|
|
'dcterm:description',
|
|
'og:description',
|
|
'weibo:article:description',
|
|
'weibo:webpage:description',
|
|
'description',
|
|
'twitter:description'
|
|
], array_keys($values)));
|
|
|
|
$this->setExcerpt(isset($values[$key]) ? $values[$key] : null);
|
|
|
|
// get main image
|
|
$key = current(array_intersect([
|
|
'image',
|
|
'og:image',
|
|
'twitter:image'
|
|
], array_keys($values)));
|
|
|
|
$this->setImage(isset($values[$key]) ? $values[$key] : null);
|
|
|
|
$key = current(array_intersect([
|
|
'og:site_name'
|
|
], array_keys($values)));
|
|
|
|
$this->setSiteName(isset($values[$key]) ? $values[$key] : null);
|
|
}
|
|
|
|
/**
|
|
* Returns all the images of the parsed article.
|
|
*
|
|
* @return array
|
|
*/
|
|
public function getImages()
|
|
{
|
|
$result = [];
|
|
if ($this->getImage()) {
|
|
$result[] = $this->getImage();
|
|
}
|
|
|
|
if (null == $this->getDOMDocument()) {
|
|
return $result;
|
|
}
|
|
|
|
foreach ($this->getDOMDocument()->getElementsByTagName('img') as $img) {
|
|
if ($src = $img->getAttribute('src')) {
|
|
$result[] = $src;
|
|
}
|
|
}
|
|
|
|
if ($this->configuration->getFixRelativeURLs()) {
|
|
foreach ($result as &$imgSrc) {
|
|
$imgSrc = $this->toAbsoluteURI($imgSrc);
|
|
}
|
|
}
|
|
|
|
$result = array_unique(array_filter($result));
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Tries to get the main article image. Will only update the metadata if the getMetadata function couldn't
|
|
* find a correct image.
|
|
*/
|
|
public function getMainImage()
|
|
{
|
|
$imgUrl = false;
|
|
|
|
if ($this->getImage() !== null) {
|
|
$imgUrl = $this->getImage();
|
|
}
|
|
|
|
if (!$imgUrl) {
|
|
foreach ($this->dom->getElementsByTagName('link') as $link) {
|
|
/** @var \DOMElement $link */
|
|
/*
|
|
* Check for the rel attribute, then check if the rel attribute is either img_src or image_src, and
|
|
* finally check for the existence of the href attribute, which should hold the image url.
|
|
*/
|
|
if ($link->hasAttribute('rel') && ($link->getAttribute('rel') === 'img_src' || $link->getAttribute('rel') === 'image_src') && $link->hasAttribute('href')) {
|
|
$imgUrl = $link->getAttribute('href');
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!empty($imgUrl) && $this->configuration->getFixRelativeURLs()) {
|
|
$this->setImage($this->toAbsoluteURI($imgUrl));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the title of the html. Prioritizes the title from the metadata against the title tag.
|
|
*
|
|
* @return string|null
|
|
*/
|
|
private function getArticleTitle()
|
|
{
|
|
$originalTitle = null;
|
|
|
|
if ($this->getTitle()) {
|
|
$originalTitle = $this->getTitle();
|
|
} else {
|
|
$this->logger->debug('[Metadata] Could not find title in metadata, searching for the title tag...');
|
|
$titleTag = $this->dom->getElementsByTagName('title');
|
|
if ($titleTag->length > 0) {
|
|
$this->logger->info(sprintf('[Metadata] Using title tag as article title: \'%s\'', $titleTag->item(0)->nodeValue));
|
|
$originalTitle = $titleTag->item(0)->nodeValue;
|
|
}
|
|
}
|
|
|
|
if ($originalTitle === null) {
|
|
return null;
|
|
}
|
|
|
|
$curTitle = $originalTitle = trim($originalTitle);
|
|
$titleHadHierarchicalSeparators = false;
|
|
|
|
/*
|
|
* If there's a separator in the title, first remove the final part
|
|
*
|
|
* Sanity warning: if you eval this match in PHPStorm's "Evaluate expression" box, it will return false
|
|
* I can assure you it works properly if you let the code run.
|
|
*/
|
|
if (preg_match('/ [\|\-\\\\\/>»] /i', $curTitle)) {
|
|
$titleHadHierarchicalSeparators = (bool)preg_match('/ [\\\\\/>»] /', $curTitle);
|
|
$curTitle = preg_replace('/(.*)[\|\-\\\\\/>»] .*/i', '$1', $originalTitle);
|
|
|
|
$this->logger->info(sprintf('[Metadata] Found hierarchical separators in title, new title is: \'%s\'', $curTitle));
|
|
|
|
// If the resulting title is too short (3 words or fewer), remove
|
|
// the first part instead:
|
|
if (count(preg_split('/\s+/', $curTitle)) < 3) {
|
|
$curTitle = preg_replace('/[^\|\-\\\\\/>»]*[\|\-\\\\\/>»](.*)/i', '$1', $originalTitle);
|
|
$this->logger->info(sprintf('[Metadata] Title too short, using the first part of the title instead: \'%s\'', $curTitle));
|
|
}
|
|
} elseif (strpos($curTitle, ': ') !== false) {
|
|
// Check if we have an heading containing this exact string, so we
|
|
// could assume it's the full title.
|
|
$match = false;
|
|
for ($i = 1; $i <= 2; $i++) {
|
|
foreach ($this->dom->getElementsByTagName('h' . $i) as $hTag) {
|
|
// Trim texts to avoid having false negatives when the title is surrounded by spaces or tabs
|
|
if (trim($hTag->nodeValue) === trim($curTitle)) {
|
|
$match = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
// If we don't, let's extract the title out of the original title string.
|
|
if (!$match) {
|
|
$curTitle = substr($originalTitle, strrpos($originalTitle, ':') + 1);
|
|
|
|
$this->logger->info(sprintf('[Metadata] Title has a colon in the middle, new title is: \'%s\'', $curTitle));
|
|
|
|
// If the title is now too short, try the first colon instead:
|
|
if (count(preg_split('/\s+/', $curTitle)) < 3) {
|
|
$curTitle = substr($originalTitle, strpos($originalTitle, ':') + 1);
|
|
$this->logger->info(sprintf('[Metadata] Title too short, using the first part of the title instead: \'%s\'', $curTitle));
|
|
} elseif (count(preg_split('/\s+/', substr($curTitle, 0, strpos($curTitle, ':')))) > 5) {
|
|
// But if we have too many words before the colon there's something weird
|
|
// with the titles and the H tags so let's just use the original title instead
|
|
$curTitle = $originalTitle;
|
|
}
|
|
}
|
|
} elseif (mb_strlen($curTitle) > 150 || mb_strlen($curTitle) < 15) {
|
|
$hOnes = $this->dom->getElementsByTagName('h1');
|
|
|
|
if ($hOnes->length === 1) {
|
|
$curTitle = $hOnes->item(0)->nodeValue;
|
|
$this->logger->info(sprintf('[Metadata] Using title from an H1 node: \'%s\'', $curTitle));
|
|
}
|
|
}
|
|
|
|
$curTitle = trim($curTitle);
|
|
|
|
/*
|
|
* If we now have 4 words or fewer as our title, and either no
|
|
* 'hierarchical' separators (\, /, > or ») were found in the original
|
|
* title or we decreased the number of words by more than 1 word, use
|
|
* the original title.
|
|
*/
|
|
$curTitleWordCount = count(preg_split('/\s+/', $curTitle));
|
|
$originalTitleWordCount = count(preg_split('/\s+/', preg_replace('/[\|\-\\\\\/>»]+/', '', $originalTitle))) - 1;
|
|
|
|
if ($curTitleWordCount <= 4 &&
|
|
(!$titleHadHierarchicalSeparators || $curTitleWordCount !== $originalTitleWordCount)) {
|
|
$curTitle = $originalTitle;
|
|
|
|
$this->logger->info(sprintf('Using title from an H1 node: \'%s\'', $curTitle));
|
|
}
|
|
|
|
return $curTitle;
|
|
}
|
|
|
|
/**
|
|
* Convert URI to an absolute URI.
|
|
*
|
|
* @param $uri string URI to convert
|
|
*
|
|
* @return string
|
|
*/
|
|
private function toAbsoluteURI($uri)
|
|
{
|
|
list($pathBase, $scheme, $prePath) = $this->getPathInfo($this->configuration->getOriginalURL());
|
|
|
|
// If this is already an absolute URI, return it.
|
|
if (preg_match('/^[a-zA-Z][a-zA-Z0-9\+\-\.]*:/', $uri)) {
|
|
return $uri;
|
|
}
|
|
|
|
// Scheme-rooted relative URI.
|
|
if (substr($uri, 0, 2) === '//') {
|
|
return $scheme . '://' . substr($uri, 2);
|
|
}
|
|
|
|
// Prepath-rooted relative URI.
|
|
if (substr($uri, 0, 1) === '/') {
|
|
return $prePath . $uri;
|
|
}
|
|
|
|
// Dotslash relative URI.
|
|
if (strpos($uri, './') === 0) {
|
|
return $pathBase . substr($uri, 2);
|
|
}
|
|
// Ignore hash URIs:
|
|
if (substr($uri, 0, 1) === '#') {
|
|
return $uri;
|
|
}
|
|
|
|
// Standard relative URI; add entire path. pathBase already includes a
|
|
// trailing "/".
|
|
return $pathBase . $uri;
|
|
}
|
|
|
|
/**
|
|
* Returns full path info of an URL.
|
|
*
|
|
* @param string $url
|
|
*
|
|
* @return array [$pathBase, $scheme, $prePath]
|
|
*/
|
|
public function getPathInfo($url)
|
|
{
|
|
// Check for base URLs
|
|
if ($this->dom->baseURI !== null) {
|
|
if (substr($this->dom->baseURI, 0, 1) === '/') {
|
|
// URLs starting with '/' override completely the URL defined in the link
|
|
$pathBase = parse_url($url, PHP_URL_SCHEME) . '://' . parse_url($url, PHP_URL_HOST) . $this->dom->baseURI;
|
|
} else {
|
|
// Otherwise just prepend the base to the actual path
|
|
$pathBase = parse_url($url, PHP_URL_SCHEME) . '://' . parse_url($url, PHP_URL_HOST) . dirname(parse_url($url, PHP_URL_PATH)) . '/' . rtrim($this->dom->baseURI, '/') . '/';
|
|
}
|
|
} else {
|
|
$pathBase = parse_url($url, PHP_URL_SCHEME) . '://' . parse_url($url, PHP_URL_HOST) . dirname(parse_url($url, PHP_URL_PATH)) . '/';
|
|
}
|
|
|
|
$scheme = parse_url($pathBase, PHP_URL_SCHEME);
|
|
$prePath = $scheme . '://' . parse_url($pathBase, PHP_URL_HOST);
|
|
|
|
return [$pathBase, $scheme, $prePath];
|
|
}
|
|
|
|
/**
|
|
* Gets nodes from the root element.
|
|
*
|
|
* @param $node DOMNode|DOMText
|
|
*
|
|
* @return array
|
|
*/
|
|
private function getNodes($node)
|
|
{
|
|
$this->logger->info('[Get Nodes] Retrieving nodes...');
|
|
|
|
$stripUnlikelyCandidates = $this->configuration->getStripUnlikelyCandidates();
|
|
|
|
$elementsToScore = [];
|
|
|
|
/*
|
|
* First, node prepping. Trash nodes that look cruddy (like ones with the
|
|
* class name "comment", etc), and turn divs into P tags where they have been
|
|
* used inappropriately (as in, where they contain no other block level elements.)
|
|
*/
|
|
|
|
while ($node) {
|
|
// Remove DOMComments nodes as we don't need them and mess up children counting
|
|
if ($node->nodeType === XML_COMMENT_NODE) {
|
|
$this->logger->debug(sprintf('[Get Nodes] Found comment node, removing... Node content was: \'%s\'', substr($node->nodeValue, 0, 128)));
|
|
$node = NodeUtility::removeAndGetNext($node);
|
|
continue;
|
|
}
|
|
|
|
$matchString = $node->getAttribute('class') . ' ' . $node->getAttribute('id');
|
|
|
|
if (!$node->isProbablyVisible()) {
|
|
$this->logger->debug(sprintf('[Get Nodes] Removing hidden node... Match string was: \'%s\'', $matchString));
|
|
$node = NodeUtility::removeAndGetNext($node);
|
|
continue;
|
|
}
|
|
|
|
// Check to see if this node is a byline, and remove it if it is.
|
|
if ($this->checkByline($node, $matchString)) {
|
|
$this->logger->debug(sprintf('[Get Nodes] Found byline, removing... Node content was: \'%s\'', substr($node->nodeValue, 0, 128)));
|
|
$node = NodeUtility::removeAndGetNext($node);
|
|
continue;
|
|
}
|
|
|
|
// Remove unlikely candidates
|
|
if ($stripUnlikelyCandidates) {
|
|
if (
|
|
preg_match(NodeUtility::$regexps['unlikelyCandidates'], $matchString) &&
|
|
!preg_match(NodeUtility::$regexps['okMaybeItsACandidate'], $matchString) &&
|
|
$node->nodeName !== 'body' &&
|
|
$node->nodeName !== 'a'
|
|
) {
|
|
$this->logger->debug(sprintf('[Get Nodes] Removing unlikely candidate. Node content was: \'%s\'', substr($node->nodeValue, 0, 128)));
|
|
$node = NodeUtility::removeAndGetNext($node);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
// Remove DIV, SECTION, and HEADER nodes without any content(e.g. text, image, video, or iframe).
|
|
if (($node->nodeName === 'div' || $node->nodeName === 'section' || $node->nodeName === 'header' ||
|
|
$node->nodeName === 'h1' || $node->nodeName === 'h2' || $node->nodeName === 'h3' ||
|
|
$node->nodeName === 'h4' || $node->nodeName === 'h5' || $node->nodeName === 'h6' ||
|
|
$node->nodeName === 'p') &&
|
|
$node->isElementWithoutContent()) {
|
|
$this->logger->debug(sprintf('[Get Nodes] Removing empty \'%s\' node.', $node->nodeName));
|
|
$node = NodeUtility::removeAndGetNext($node);
|
|
continue;
|
|
}
|
|
|
|
if (in_array(strtolower($node->nodeName), $this->defaultTagsToScore)) {
|
|
$this->logger->debug(sprintf('[Get Nodes] Adding node to score list, node content is: \'%s\'', substr($node->nodeValue, 0, 128)));
|
|
$elementsToScore[] = $node;
|
|
}
|
|
|
|
// Turn all divs that don't have children block level elements into p's
|
|
if ($node->nodeName === 'div') {
|
|
// Put phrasing content into paragraphs.
|
|
$p = null;
|
|
$childNode = $node->firstChild;
|
|
while ($childNode) {
|
|
$nextSibling = $childNode->nextSibling;
|
|
if ($childNode->isPhrasingContent()) {
|
|
if ($p !== null) {
|
|
$p->appendChild($childNode);
|
|
} elseif (!$childNode->isWhitespace()) {
|
|
$p = $this->dom->createElement('p');
|
|
$node->replaceChild($p, $childNode);
|
|
$p->appendChild($childNode);
|
|
}
|
|
} elseif ($p !== null) {
|
|
while ($p->lastChild && $p->lastChild->isWhitespace()) {
|
|
$p->removeChild($p->lastChild);
|
|
}
|
|
$p = null;
|
|
}
|
|
$childNode = $nextSibling;
|
|
}
|
|
|
|
/*
|
|
* Sites like http://mobile.slate.com encloses each paragraph with a DIV
|
|
* element. DIVs with only a P element inside and no text content can be
|
|
* safely converted into plain P elements to avoid confusing the scoring
|
|
* algorithm with DIVs with are, in practice, paragraphs.
|
|
*/
|
|
if ($node->hasSingleTagInsideElement('p') && $node->getLinkDensity() < 0.25) {
|
|
$this->logger->debug(sprintf('[Get Nodes] Found DIV with a single P node, removing DIV. Node content is: \'%s\'', substr($node->nodeValue, 0, 128)));
|
|
$pNode = NodeUtility::filterTextNodes($node->childNodes)->item(0);
|
|
$node->parentNode->replaceChild($pNode, $node);
|
|
$node = $pNode;
|
|
$elementsToScore[] = $node;
|
|
} elseif (!$node->hasSingleChildBlockElement()) {
|
|
$this->logger->debug(sprintf('[Get Nodes] Found DIV with a single child block element, converting to a P node. Node content is: \'%s\'', substr($node->nodeValue, 0, 128)));
|
|
$node = NodeUtility::setNodeTag($node, 'p');
|
|
$elementsToScore[] = $node;
|
|
}
|
|
}
|
|
|
|
$node = NodeUtility::getNextNode($node);
|
|
}
|
|
|
|
return $elementsToScore;
|
|
}
|
|
|
|
/**
|
|
* Checks if the node is a byline.
|
|
*
|
|
* @param DOMNode $node
|
|
* @param string $matchString
|
|
*
|
|
* @return bool
|
|
*/
|
|
private function checkByline($node, $matchString)
|
|
{
|
|
if (!$this->configuration->getArticleByLine()) {
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Check if the byline is already set
|
|
*/
|
|
if ($this->getAuthor()) {
|
|
return false;
|
|
}
|
|
|
|
$rel = $node->getAttribute('rel');
|
|
|
|
if ($rel === 'author' || preg_match(NodeUtility::$regexps['byline'], $matchString) && $this->isValidByline($node->getTextContent())) {
|
|
$this->logger->info(sprintf('[Metadata] Found article author: \'%s\'', $node->getTextContent()));
|
|
$this->setAuthor(trim($node->getTextContent()));
|
|
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Checks the validity of a byLine. Based on string length.
|
|
*
|
|
* @param string $text
|
|
*
|
|
* @return bool
|
|
*/
|
|
private function isValidByline($text)
|
|
{
|
|
if (gettype($text) == 'string') {
|
|
$byline = trim($text);
|
|
|
|
return (mb_strlen($byline) > 0) && (mb_strlen($byline) < 100);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Removes all the scripts of the html.
|
|
*
|
|
* @param DOMDocument $dom
|
|
*/
|
|
private function removeScripts(DOMDocument $dom)
|
|
{
|
|
foreach (['script', 'noscript'] as $tag) {
|
|
$nodes = $dom->getElementsByTagName($tag);
|
|
foreach (iterator_to_array($nodes) as $node) {
|
|
NodeUtility::removeNode($node);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Prepares the document for parsing.
|
|
*
|
|
* @param DOMDocument $dom
|
|
*/
|
|
private function prepDocument(DOMDocument $dom)
|
|
{
|
|
$this->logger->info('[PrepDocument] Preparing document for parsing...');
|
|
|
|
foreach ($dom->shiftingAwareGetElementsByTagName('br') as $br) {
|
|
$next = $br->nextSibling;
|
|
|
|
/*
|
|
* Whether 2 or more <br> elements have been found and replaced with a
|
|
* <p> block.
|
|
*/
|
|
$replaced = false;
|
|
|
|
/*
|
|
* If we find a <br> chain, remove the <br>s until we hit another element
|
|
* or non-whitespace. This leaves behind the first <br> in the chain
|
|
* (which will be replaced with a <p> later).
|
|
*/
|
|
while (($next = NodeUtility::nextElement($next)) && ($next->nodeName === 'br')) {
|
|
$this->logger->debug('[PrepDocument] Removing chain of BR nodes...');
|
|
|
|
$replaced = true;
|
|
$brSibling = $next->nextSibling;
|
|
$next->parentNode->removeChild($next);
|
|
$next = $brSibling;
|
|
}
|
|
|
|
/*
|
|
* If we removed a <br> chain, replace the remaining <br> with a <p>. Add
|
|
* all sibling nodes as children of the <p> until we hit another <br>
|
|
* chain.
|
|
*/
|
|
|
|
if ($replaced) {
|
|
$p = $dom->createElement('p');
|
|
$br->parentNode->replaceChild($p, $br);
|
|
|
|
$next = $p->nextSibling;
|
|
while ($next) {
|
|
// If we've hit another <br><br>, we're done adding children to this <p>.
|
|
if ($next->nodeName === 'br') {
|
|
$nextElem = NodeUtility::nextElement($next->nextSibling);
|
|
if ($nextElem && $nextElem->nodeName === 'br') {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!$next->isPhrasingContent()) {
|
|
break;
|
|
}
|
|
|
|
$this->logger->debug('[PrepDocument] Replacing BR with a P node...');
|
|
|
|
// Otherwise, make this node a child of the new <p>.
|
|
$sibling = $next->nextSibling;
|
|
$p->appendChild($next);
|
|
$next = $sibling;
|
|
}
|
|
|
|
while ($p->lastChild && $p->lastChild->isWhitespace()) {
|
|
$p->removeChild($p->lastChild);
|
|
}
|
|
|
|
if ($p->parentNode->tagName === 'p') {
|
|
NodeUtility::setNodeTag($p->parentNode, 'div');
|
|
}
|
|
}
|
|
}
|
|
|
|
// Replace font tags with span
|
|
$fonts = $dom->getElementsByTagName('font');
|
|
$length = $fonts->length;
|
|
for ($i = 0; $i < $length; $i++) {
|
|
$this->logger->debug('[PrepDocument] Converting font tag into a span tag.');
|
|
$font = $fonts->item($length - 1 - $i);
|
|
NodeUtility::setNodeTag($font, 'span');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Assign scores to each node. Returns full article parsed or false on error.
|
|
*
|
|
* @param array $nodes
|
|
*
|
|
* @return DOMDocument|bool
|
|
*/
|
|
private function rateNodes($nodes)
|
|
{
|
|
$this->logger->info('[Rating] Rating nodes...');
|
|
|
|
$candidates = [];
|
|
|
|
/** @var DOMElement $node */
|
|
foreach ($nodes as $node) {
|
|
if (is_null($node->parentNode)) {
|
|
continue;
|
|
}
|
|
|
|
// Discard nodes with less than 25 characters, without blank space
|
|
if (mb_strlen($node->getTextContent(true)) < 25) {
|
|
continue;
|
|
}
|
|
|
|
$ancestors = $node->getNodeAncestors();
|
|
|
|
// Exclude nodes with no ancestor
|
|
if (count($ancestors) === 0) {
|
|
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->getTextContent(true)));
|
|
|
|
// For every 100 characters in this paragraph, add another point. Up to 3 points.
|
|
$contentScore += min(floor(mb_strlen($node->getTextContent(true)) / 100), 3);
|
|
|
|
$this->logger->debug(sprintf('[Rating] Node score %s, content: \'%s\'', $contentScore, substr($node->nodeValue, 0, 128)));
|
|
|
|
/** @var $ancestor DOMElement */
|
|
foreach ($ancestors as $level => $ancestor) {
|
|
$this->logger->debug('[Rating] Found ancestor, initializing and adding it as a candidate...');
|
|
if (!$ancestor->isInitialized()) {
|
|
$ancestor->initializeNode($this->configuration->getWeightClasses());
|
|
$candidates[] = $ancestor;
|
|
}
|
|
|
|
/*
|
|
* Node score divider:
|
|
* - parent: 1 (no division)
|
|
* - grandparent: 2
|
|
* - great grandparent+: ancestor level * 3
|
|
*/
|
|
|
|
if ($level === 0) {
|
|
$scoreDivider = 1;
|
|
} elseif ($level === 1) {
|
|
$scoreDivider = 2;
|
|
} else {
|
|
$scoreDivider = $level * 3;
|
|
}
|
|
|
|
$currentScore = $ancestor->contentScore;
|
|
$ancestor->contentScore = $currentScore + ($contentScore / $scoreDivider);
|
|
|
|
$this->logger->debug(sprintf('[Rating] Ancestor score %s, value: \'%s\'', $ancestor->contentScore, substr($ancestor->nodeValue, 0, 128)));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* After we've calculated scores, loop through all of the possible
|
|
* candidate nodes we found and find the one with the highest score.
|
|
*/
|
|
|
|
$topCandidates = [];
|
|
foreach ($candidates as $candidate) {
|
|
|
|
/*
|
|
* Scale the final candidates score based on link density. Good content
|
|
* should have a relatively small link density (5% or less) and be mostly
|
|
* unaffected by this operation.
|
|
*/
|
|
|
|
$candidate->contentScore = $candidate->contentScore * (1 - $candidate->getLinkDensity());
|
|
|
|
for ($i = 0; $i < $this->configuration->getMaxTopCandidates(); $i++) {
|
|
$aTopCandidate = isset($topCandidates[$i]) ? $topCandidates[$i] : null;
|
|
|
|
if (!$aTopCandidate || $candidate->contentScore > $aTopCandidate->contentScore) {
|
|
array_splice($topCandidates, $i, 0, [$candidate]);
|
|
if (count($topCandidates) > $this->configuration->getMaxTopCandidates()) {
|
|
array_pop($topCandidates);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
$topCandidate = isset($topCandidates[0]) ? $topCandidates[0] : null;
|
|
$parentOfTopCandidate = null;
|
|
|
|
/*
|
|
* If we still have no top candidate, just use the body as a last resort.
|
|
* We also have to copy the body node so it is something we can modify.
|
|
*/
|
|
|
|
if ($topCandidate === null || $topCandidate->nodeName === 'body') {
|
|
$this->logger->info('[Rating] No top candidate found or top candidate is the body tag. Moving all child nodes to a new DIV node.');
|
|
|
|
// Move all of the page's children into topCandidate
|
|
$topCandidate = new DOMDocument('1.0', 'utf-8');
|
|
$topCandidate->encoding = 'UTF-8';
|
|
$topCandidate->appendChild($topCandidate->createElement('div', ''));
|
|
$kids = $this->dom->getElementsByTagName('body')->item(0)->childNodes;
|
|
|
|
// Cannot be foreached, don't ask me why.
|
|
for ($i = 0; $i < $kids->length; $i++) {
|
|
$import = $topCandidate->importNode($kids->item($i), true);
|
|
$topCandidate->firstChild->appendChild($import);
|
|
}
|
|
|
|
// Candidate must be created using firstChild to grab the DOMElement instead of the DOMDocument.
|
|
$topCandidate = $topCandidate->firstChild;
|
|
} elseif ($topCandidate) {
|
|
$this->logger->info(sprintf('[Rating] Found top candidate, score: %s', $topCandidate->contentScore));
|
|
// Find a better top candidate node if it contains (at least three) nodes which belong to `topCandidates` array
|
|
// and whose scores are quite closed with current `topCandidate` node.
|
|
$alternativeCandidateAncestors = [];
|
|
for ($i = 1; $i < count($topCandidates); $i++) {
|
|
// In some cases we may end up with a top candidate with zero content score. To avoid dividing by zero
|
|
// we have to use max() and replace zero with a low value like 0.1
|
|
if ($topCandidates[$i]->contentScore / max($topCandidate->contentScore, 0.1) >= 0.75) {
|
|
array_push($alternativeCandidateAncestors, $topCandidates[$i]->getNodeAncestors(false));
|
|
}
|
|
}
|
|
|
|
$MINIMUM_TOPCANDIDATES = 3;
|
|
if (count($alternativeCandidateAncestors) >= $MINIMUM_TOPCANDIDATES) {
|
|
$parentOfTopCandidate = $topCandidate->parentNode;
|
|
|
|
// Check if we are actually dealing with a DOMNode and not a DOMDocument node or higher
|
|
while ($parentOfTopCandidate->nodeName !== 'body' && $parentOfTopCandidate->nodeType === XML_ELEMENT_NODE) {
|
|
$listsContainingThisAncestor = 0;
|
|
for ($ancestorIndex = 0; $ancestorIndex < count($alternativeCandidateAncestors) && $listsContainingThisAncestor < $MINIMUM_TOPCANDIDATES; $ancestorIndex++) {
|
|
$listsContainingThisAncestor += (int)in_array($parentOfTopCandidate, $alternativeCandidateAncestors[$ancestorIndex]);
|
|
}
|
|
if ($listsContainingThisAncestor >= $MINIMUM_TOPCANDIDATES) {
|
|
$topCandidate = $parentOfTopCandidate;
|
|
break;
|
|
}
|
|
$parentOfTopCandidate = $parentOfTopCandidate->parentNode;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Because of our bonus system, parents of candidates might have scores
|
|
* themselves. They get half of the node. There won't be nodes with higher
|
|
* scores than our topCandidate, but if we see the score going *up* in the first
|
|
* few steps up the tree, that's a decent sign that there might be more content
|
|
* lurking in other places that we want to unify in. The sibling stuff
|
|
* below does some of that - but only if we've looked high enough up the DOM
|
|
* tree.
|
|
*/
|
|
|
|
$parentOfTopCandidate = $topCandidate->parentNode;
|
|
$lastScore = $topCandidate->contentScore;
|
|
|
|
// The scores shouldn't get too low.
|
|
$scoreThreshold = $lastScore / 3;
|
|
|
|
/* @var DOMElement $parentOfTopCandidate */
|
|
while ($parentOfTopCandidate->nodeName !== 'body') {
|
|
$parentScore = $parentOfTopCandidate->contentScore;
|
|
if ($parentScore < $scoreThreshold) {
|
|
break;
|
|
}
|
|
|
|
if ($parentScore > $lastScore) {
|
|
// Alright! We found a better parent to use.
|
|
$topCandidate = $parentOfTopCandidate;
|
|
$this->logger->info('[Rating] Found a better top candidate.');
|
|
break;
|
|
}
|
|
$lastScore = $parentOfTopCandidate->contentScore;
|
|
$parentOfTopCandidate = $parentOfTopCandidate->parentNode;
|
|
}
|
|
|
|
// If the top candidate is the only child, use parent instead. This will help sibling
|
|
// joining logic when adjacent content is actually located in parent's sibling node.
|
|
$parentOfTopCandidate = $topCandidate->parentNode;
|
|
while ($parentOfTopCandidate->nodeName !== 'body' && count(NodeUtility::filterTextNodes($parentOfTopCandidate->childNodes)) === 1) {
|
|
$topCandidate = $parentOfTopCandidate;
|
|
$parentOfTopCandidate = $topCandidate->parentNode;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now that we have the top candidate, look through its siblings for content
|
|
* that might also be related. Things like preambles, content split by ads
|
|
* that we removed, etc.
|
|
*/
|
|
|
|
$this->logger->info('[Rating] Creating final article content document...');
|
|
|
|
$articleContent = new DOMDocument('1.0', 'utf-8');
|
|
$articleContent->createElement('div');
|
|
|
|
$siblingScoreThreshold = max(10, $topCandidate->contentScore * 0.2);
|
|
// Keep potential top candidate's parent node to try to get text direction of it later.
|
|
$parentOfTopCandidate = $topCandidate->parentNode;
|
|
$siblings = $parentOfTopCandidate->childNodes;
|
|
|
|
$hasContent = false;
|
|
|
|
$this->logger->info('[Rating] Adding top candidate siblings...');
|
|
|
|
/* @var DOMElement $sibling */
|
|
// Can't foreach here because down there we might change the tag name and that causes the foreach to skip items
|
|
for ($i = 0; $i < $siblings->length; $i++) {
|
|
$sibling = $siblings[$i];
|
|
$append = false;
|
|
|
|
if ($sibling === $topCandidate) {
|
|
$this->logger->debug('[Rating] Sibling is equal to the top candidate, adding to the final article...');
|
|
|
|
$append = true;
|
|
} else {
|
|
$contentBonus = 0;
|
|
|
|
// Give a bonus if sibling nodes and top candidates have the example same classname
|
|
if ($sibling->getAttribute('class') === $topCandidate->getAttribute('class') && $topCandidate->getAttribute('class') !== '') {
|
|
$contentBonus += $topCandidate->contentScore * 0.2;
|
|
}
|
|
if ($sibling->contentScore + $contentBonus >= $siblingScoreThreshold) {
|
|
$append = true;
|
|
} elseif ($sibling->nodeName === 'p') {
|
|
$linkDensity = $sibling->getLinkDensity();
|
|
$nodeContent = $sibling->getTextContent(true);
|
|
|
|
if (mb_strlen($nodeContent) > 80 && $linkDensity < 0.25) {
|
|
$append = true;
|
|
} elseif ($nodeContent && mb_strlen($nodeContent) < 80 && $linkDensity === 0 && preg_match('/\.( |$)/', $nodeContent)) {
|
|
$append = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($append) {
|
|
$this->logger->debug(sprintf('[Rating] Appending sibling to final article, content is: \'%s\'', substr($sibling->nodeValue, 0, 128)));
|
|
|
|
$hasContent = true;
|
|
|
|
if (!in_array(strtolower($sibling->nodeName), $this->alterToDIVExceptions)) {
|
|
/*
|
|
* We have a node that isn't a common block level element, like a form or td tag.
|
|
* Turn it into a div so it doesn't get filtered out later by accident.
|
|
*/
|
|
$sibling = NodeUtility::setNodeTag($sibling, 'div');
|
|
}
|
|
|
|
$import = $articleContent->importNode($sibling, true);
|
|
$articleContent->appendChild($import);
|
|
|
|
/*
|
|
* No node shifting needs to be check because when calling getChildren, an array is made with the
|
|
* children of the parent node, instead of using the DOMElement childNodes function, which, when used
|
|
* along with appendChild, would shift the nodes position and the current foreach will behave in
|
|
* unpredictable ways.
|
|
*/
|
|
}
|
|
}
|
|
|
|
$articleContent = $this->prepArticle($articleContent);
|
|
|
|
if ($hasContent) {
|
|
// Find out text direction from ancestors of final top candidate.
|
|
$ancestors = array_merge([$parentOfTopCandidate, $topCandidate], $parentOfTopCandidate->getNodeAncestors());
|
|
foreach ($ancestors as $ancestor) {
|
|
$articleDir = $ancestor->getAttribute('dir');
|
|
if ($articleDir) {
|
|
$this->setDirection($articleDir);
|
|
$this->logger->debug(sprintf('[Rating] Found article direction: %s', $articleDir));
|
|
break;
|
|
}
|
|
}
|
|
|
|
return $articleContent;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Cleans up the final article.
|
|
*
|
|
* @param DOMDocument $article
|
|
*
|
|
* @return DOMDocument
|
|
*/
|
|
public function prepArticle(DOMDocument $article)
|
|
{
|
|
$this->logger->info('[PrepArticle] Preparing final article...');
|
|
|
|
$this->_cleanStyles($article);
|
|
$this->_clean($article, 'style');
|
|
|
|
// Check for data tables before we continue, to avoid removing items in
|
|
// those tables, which will often be isolated even though they're
|
|
// visually linked to other content-ful elements (text, images, etc.).
|
|
$this->_markDataTables($article);
|
|
|
|
// Clean out junk from the article content
|
|
$this->_cleanConditionally($article, 'form');
|
|
$this->_cleanConditionally($article, 'fieldset');
|
|
$this->_clean($article, 'object');
|
|
$this->_clean($article, 'embed');
|
|
$this->_clean($article, 'h1');
|
|
$this->_clean($article, 'footer');
|
|
$this->_clean($article, 'link');
|
|
$this->_clean($article, 'aside');
|
|
|
|
// Clean out elements have "share" in their id/class combinations from final top candidates,
|
|
// which means we don't remove the top candidates even they have "share".
|
|
foreach ($article->childNodes as $child) {
|
|
$this->_cleanMatchedNodes($child, '/share/i');
|
|
}
|
|
|
|
/*
|
|
* If there is only one h2 and its text content substantially equals article title,
|
|
* they are probably using it as a header and not a subheader,
|
|
* so remove it since we already extract the title separately.
|
|
*/
|
|
$h2 = $article->getElementsByTagName('h2');
|
|
if ($h2->length === 1) {
|
|
$lengthSimilarRate = (mb_strlen($h2->item(0)->textContent) - mb_strlen($this->getTitle())) / max(mb_strlen($this->getTitle()), 1);
|
|
|
|
if (abs($lengthSimilarRate) < 0.5) {
|
|
if ($lengthSimilarRate > 0) {
|
|
$titlesMatch = strpos($h2->item(0)->textContent, $this->getTitle()) !== false;
|
|
} else {
|
|
$titlesMatch = strpos($this->getTitle(), $h2->item(0)->textContent) !== false;
|
|
}
|
|
if ($titlesMatch) {
|
|
$this->logger->info('[PrepArticle] Found title repeated in an H2 node, removing...');
|
|
$this->_clean($article, 'h2');
|
|
}
|
|
}
|
|
}
|
|
|
|
$this->_clean($article, 'iframe');
|
|
$this->_clean($article, 'input');
|
|
$this->_clean($article, 'textarea');
|
|
$this->_clean($article, 'select');
|
|
$this->_clean($article, 'button');
|
|
$this->_cleanHeaders($article);
|
|
|
|
// Do these last as the previous stuff may have removed junk
|
|
// that will affect these
|
|
$this->_cleanConditionally($article, 'table');
|
|
$this->_cleanConditionally($article, 'ul');
|
|
$this->_cleanConditionally($article, 'div');
|
|
|
|
$this->_cleanExtraParagraphs($article);
|
|
|
|
foreach (iterator_to_array($article->getElementsByTagName('br')) as $br) {
|
|
$next = $br->nextSibling;
|
|
if ($next && $next->nodeName === 'p') {
|
|
$this->logger->debug('[PrepArticle] Removing br node next to a p node.');
|
|
$br->parentNode->removeChild($br);
|
|
}
|
|
}
|
|
|
|
// Remove single-cell tables
|
|
foreach ($article->shiftingAwareGetElementsByTagName('table') as $table) {
|
|
/** @var DOMNode $table */
|
|
$tbody = $table->hasSingleTagInsideElement('tbody') ? $table->getFirstElementChild() : $table;
|
|
if ($tbody->hasSingleTagInsideElement('tr')) {
|
|
$row = $tbody->getFirstElementChild();
|
|
if ($row->hasSingleTagInsideElement('td')) {
|
|
$cell = $row->getFirstElementChild();
|
|
$cell = NodeUtility::setNodeTag($cell, (array_reduce(iterator_to_array($cell->childNodes), function ($carry, $node) {
|
|
return $node->isPhrasingContent() && $carry;
|
|
}, true)) ? 'p' : 'div');
|
|
$table->parentNode->replaceChild($cell, $table);
|
|
}
|
|
}
|
|
}
|
|
|
|
return $article;
|
|
}
|
|
|
|
/**
|
|
* Look for 'data' (as opposed to 'layout') tables, for which we use
|
|
* similar checks as
|
|
* https://dxr.mozilla.org/mozilla-central/rev/71224049c0b52ab190564d3ea0eab089a159a4cf/accessible/html/HTMLTableAccessible.cpp#920.
|
|
*
|
|
* @param DOMDocument $article
|
|
*
|
|
* @return void
|
|
*/
|
|
public function _markDataTables(DOMDocument $article)
|
|
{
|
|
$tables = $article->getElementsByTagName('table');
|
|
foreach ($tables as $table) {
|
|
/** @var DOMElement $table */
|
|
$role = $table->getAttribute('role');
|
|
if ($role === 'presentation') {
|
|
$table->setReadabilityDataTable(false);
|
|
continue;
|
|
}
|
|
$datatable = $table->getAttribute('datatable');
|
|
if ($datatable == '0') {
|
|
$table->setReadabilityDataTable(false);
|
|
continue;
|
|
}
|
|
$summary = $table->getAttribute('summary');
|
|
if ($summary) {
|
|
$table->setReadabilityDataTable(true);
|
|
continue;
|
|
}
|
|
|
|
$caption = $table->getElementsByTagName('caption');
|
|
if ($caption->length > 0 && $caption->item(0)->childNodes->length > 0) {
|
|
$table->setReadabilityDataTable(true);
|
|
continue;
|
|
}
|
|
|
|
// If the table has a descendant with any of these tags, consider a data table:
|
|
foreach (['col', 'colgroup', 'tfoot', 'thead', 'th'] as $dataTableDescendants) {
|
|
if ($table->getElementsByTagName($dataTableDescendants)->length > 0) {
|
|
$table->setReadabilityDataTable(true);
|
|
continue 2;
|
|
}
|
|
}
|
|
|
|
// Nested tables indicate a layout table:
|
|
if ($table->getElementsByTagName('table')->length > 0) {
|
|
$table->setReadabilityDataTable(false);
|
|
continue;
|
|
}
|
|
|
|
$sizeInfo = $table->getRowAndColumnCount();
|
|
if ($sizeInfo['rows'] >= 10 || $sizeInfo['columns'] > 4) {
|
|
$table->setReadabilityDataTable(true);
|
|
continue;
|
|
}
|
|
// Now just go by size entirely:
|
|
$table->setReadabilityDataTable($sizeInfo['rows'] * $sizeInfo['columns'] > 10);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Remove the style attribute on every e and under.
|
|
*
|
|
* @param $node DOMDocument|DOMNode
|
|
**/
|
|
public function _cleanStyles($node)
|
|
{
|
|
if (property_exists($node, 'tagName') && $node->tagName === 'svg') {
|
|
return;
|
|
}
|
|
|
|
// Do not bother if there's no method to remove an attribute
|
|
if (method_exists($node, 'removeAttribute')) {
|
|
$presentational_attributes = ['align', 'background', 'bgcolor', 'border', 'cellpadding', 'cellspacing', 'frame', 'hspace', 'rules', 'style', 'valign', 'vspace'];
|
|
// Remove `style` and deprecated presentational attributes
|
|
foreach ($presentational_attributes as $presentational_attribute) {
|
|
$node->removeAttribute($presentational_attribute);
|
|
}
|
|
|
|
$deprecated_size_attribute_elems = ['table', 'th', 'td', 'hr', 'pre'];
|
|
if (property_exists($node, 'tagName') && in_array($node->tagName, $deprecated_size_attribute_elems)) {
|
|
$node->removeAttribute('width');
|
|
$node->removeAttribute('height');
|
|
}
|
|
}
|
|
|
|
$cur = $node->firstChild;
|
|
while ($cur !== null) {
|
|
$this->_cleanStyles($cur);
|
|
$cur = $cur->nextSibling;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Clean out elements whose id/class combinations match specific string.
|
|
*
|
|
* @param $node DOMElement Node to clean
|
|
* @param $regex string Match id/class combination.
|
|
*
|
|
* @return void
|
|
**/
|
|
public function _cleanMatchedNodes($node, $regex)
|
|
{
|
|
$endOfSearchMarkerNode = NodeUtility::getNextNode($node, true);
|
|
$next = NodeUtility::getNextNode($node);
|
|
while ($next && $next !== $endOfSearchMarkerNode) {
|
|
if (preg_match($regex, sprintf('%s %s', $next->getAttribute('class'), $next->getAttribute('id')))) {
|
|
$this->logger->debug(sprintf('Removing matched node with regex: \'%s\', node class was: \'%s\', id: \'%s\'', $regex, $next->getAttribute('class'), $next->getAttribute('id')));
|
|
$next = NodeUtility::removeAndGetNext($next);
|
|
} else {
|
|
$next = NodeUtility::getNextNode($next);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param DOMDocument $article
|
|
*
|
|
* @return void
|
|
*/
|
|
public function _cleanExtraParagraphs(DOMDocument $article)
|
|
{
|
|
$paragraphs = $article->getElementsByTagName('p');
|
|
$length = $paragraphs->length;
|
|
|
|
for ($i = 0; $i < $length; $i++) {
|
|
$paragraph = $paragraphs->item($length - 1 - $i);
|
|
|
|
$imgCount = $paragraph->getElementsByTagName('img')->length;
|
|
$embedCount = $paragraph->getElementsByTagName('embed')->length;
|
|
$objectCount = $paragraph->getElementsByTagName('object')->length;
|
|
// At this point, nasty iframes have been removed, only remain embedded video ones.
|
|
$iframeCount = $paragraph->getElementsByTagName('iframe')->length;
|
|
$totalCount = $imgCount + $embedCount + $objectCount + $iframeCount;
|
|
|
|
if ($totalCount === 0 && !preg_replace(NodeUtility::$regexps['onlyWhitespace'], '', $paragraph->textContent)) {
|
|
$this->logger->debug(sprintf('[PrepArticle] Removing extra paragraph. Text content was: \'%s\'', substr($paragraph->textContent, 0, 128)));
|
|
$paragraph->parentNode->removeChild($paragraph);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param DOMDocument $article
|
|
* @param string $tag Tag to clean conditionally
|
|
*
|
|
* @return void
|
|
*/
|
|
public function _cleanConditionally(DOMDocument $article, $tag)
|
|
{
|
|
if (!$this->configuration->getCleanConditionally()) {
|
|
return;
|
|
}
|
|
|
|
$isList = in_array($tag, ['ul', 'ol']);
|
|
|
|
/*
|
|
* Gather counts for other typical elements embedded within.
|
|
* Traverse backwards so we can remove nodes at the same time
|
|
* without effecting the traversal.
|
|
*/
|
|
|
|
$DOMNodeList = $article->getElementsByTagName($tag);
|
|
$length = $DOMNodeList->length;
|
|
for ($i = 0; $i < $length; $i++) {
|
|
/** @var $node DOMElement */
|
|
$node = $DOMNodeList->item($length - 1 - $i);
|
|
|
|
// First check if we're in a data table, in which case don't remove us.
|
|
if ($node->hasAncestorTag('table', -1, function ($node) {
|
|
return $node->isReadabilityDataTable();
|
|
})) {
|
|
continue;
|
|
}
|
|
|
|
$weight = 0;
|
|
if ($this->configuration->getWeightClasses()) {
|
|
$weight = $node->getClassWeight();
|
|
}
|
|
|
|
if ($weight < 0) {
|
|
$this->logger->debug(sprintf('[PrepArticle] Removing tag \'%s\' with 0 or less weight', $tag));
|
|
|
|
NodeUtility::removeNode($node);
|
|
continue;
|
|
}
|
|
|
|
if (substr_count($node->getTextContent(), ',') < 10) {
|
|
/*
|
|
* If there are not very many commas, and the number of
|
|
* non-paragraph elements is more than paragraphs or other
|
|
* ominous signs, remove the element.
|
|
*/
|
|
|
|
$p = $node->getElementsByTagName('p')->length;
|
|
$img = $node->getElementsByTagName('img')->length;
|
|
$li = $node->getElementsByTagName('li')->length - 100;
|
|
$input = $node->getElementsByTagName('input')->length;
|
|
|
|
$embedCount = 0;
|
|
$embeds = $node->getElementsByTagName('embed');
|
|
|
|
foreach ($embeds as $embedNode) {
|
|
if (preg_match(NodeUtility::$regexps['videos'], $embedNode->C14N())) {
|
|
$embedCount++;
|
|
}
|
|
}
|
|
|
|
$linkDensity = $node->getLinkDensity();
|
|
$contentLength = mb_strlen($node->getTextContent(true));
|
|
|
|
$haveToRemove =
|
|
($img > 1 && $p / $img < 0.5 && !$node->hasAncestorTag('figure')) ||
|
|
(!$isList && $li > $p) ||
|
|
($input > floor($p / 3)) ||
|
|
(!$isList && $contentLength < 25 && ($img === 0 || $img > 2) && !$node->hasAncestorTag('figure')) ||
|
|
(!$isList && $weight < 25 && $linkDensity > 0.2) ||
|
|
($weight >= 25 && $linkDensity > 0.5) ||
|
|
(($embedCount === 1 && $contentLength < 75) || $embedCount > 1);
|
|
|
|
if ($haveToRemove) {
|
|
$this->logger->debug(sprintf('[PrepArticle] Removing tag \'%s\'.', $tag));
|
|
|
|
NodeUtility::removeNode($node);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Clean a node of all elements of type "tag".
|
|
* (Unless it's a youtube/vimeo video. People love movies.).
|
|
*
|
|
* @param $article DOMDocument
|
|
* @param $tag string tag to clean
|
|
*
|
|
* @return void
|
|
**/
|
|
public function _clean(DOMDocument $article, $tag)
|
|
{
|
|
$isEmbed = in_array($tag, ['object', 'embed', 'iframe']);
|
|
|
|
$DOMNodeList = $article->getElementsByTagName($tag);
|
|
$length = $DOMNodeList->length;
|
|
for ($i = 0; $i < $length; $i++) {
|
|
$item = $DOMNodeList->item($length - 1 - $i);
|
|
|
|
// Allow youtube and vimeo videos through as people usually want to see those.
|
|
if ($isEmbed) {
|
|
$attributeValues = [];
|
|
foreach ($item->attributes as $value) {
|
|
$attributeValues[] = $value->nodeValue;
|
|
}
|
|
$attributeValues = implode('|', $attributeValues);
|
|
|
|
// First, check the elements attributes to see if any of them contain youtube or vimeo
|
|
if (preg_match(NodeUtility::$regexps['videos'], $attributeValues)) {
|
|
continue;
|
|
}
|
|
|
|
// Then check the elements inside this element for the same.
|
|
if (preg_match(NodeUtility::$regexps['videos'], $item->C14N())) {
|
|
continue;
|
|
}
|
|
}
|
|
$this->logger->debug(sprintf('[PrepArticle] Removing node \'%s\'.', $item->tagName));
|
|
|
|
NodeUtility::removeNode($item);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Clean out spurious headers from an Element. Checks things like classnames and link density.
|
|
*
|
|
* @param DOMDocument $article
|
|
*
|
|
* @return void
|
|
**/
|
|
public function _cleanHeaders(DOMDocument $article)
|
|
{
|
|
for ($headerIndex = 1; $headerIndex < 3; $headerIndex++) {
|
|
$headers = $article->getElementsByTagName('h' . $headerIndex);
|
|
/** @var $header DOMElement */
|
|
foreach ($headers as $header) {
|
|
$weight = 0;
|
|
if ($this->configuration->getWeightClasses()) {
|
|
$weight = $header->getClassWeight();
|
|
}
|
|
|
|
if ($weight < 0) {
|
|
$this->logger->debug(sprintf('[PrepArticle] Removing H node with 0 or less weight. Content was: \'%s\'', substr($header->nodeValue, 0, 128)));
|
|
|
|
NodeUtility::removeNode($header);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Removes the class="" attribute from every element in the given
|
|
* subtree.
|
|
*
|
|
* Readability.js has a special filter to avoid cleaning the classes that the algorithm adds. We don't add classes
|
|
* here so no need to filter those.
|
|
*
|
|
* @param DOMDocument|DOMNode $node
|
|
*
|
|
* @return void
|
|
**/
|
|
public function _cleanClasses($node)
|
|
{
|
|
if ($node->getAttribute('class') !== '') {
|
|
$node->removeAttribute('class');
|
|
}
|
|
|
|
for ($node = $node->getFirstElementChild(); $node !== null; $node = $node->nextSibling) {
|
|
$this->_cleanClasses($node);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param DOMDocument $article
|
|
*
|
|
* @return DOMDocument
|
|
*/
|
|
public function postProcessContent(DOMDocument $article)
|
|
{
|
|
$this->logger->info('[PostProcess] PostProcessing content...');
|
|
|
|
// Readability cannot open relative uris so we convert them to absolute uris.
|
|
if ($this->configuration->getFixRelativeURLs()) {
|
|
foreach (iterator_to_array($article->getElementsByTagName('a')) as $link) {
|
|
/** @var DOMElement $link */
|
|
$href = $link->getAttribute('href');
|
|
if ($href) {
|
|
// Replace links with javascript: URIs with text content, since
|
|
// they won't work after scripts have been removed from the page.
|
|
if (strpos($href, 'javascript:') === 0) {
|
|
$this->logger->debug(sprintf('[PostProcess] Removing \'javascript:\' link. Content is: \'%s\'', substr($link->textContent, 0, 128)));
|
|
|
|
$text = $article->createTextNode($link->textContent);
|
|
$link->parentNode->replaceChild($text, $link);
|
|
} else {
|
|
$this->logger->debug(sprintf('[PostProcess] Converting link to absolute URI: \'%s\'', substr($href, 0, 128)));
|
|
|
|
$link->setAttribute('href', $this->toAbsoluteURI($href));
|
|
}
|
|
}
|
|
}
|
|
|
|
foreach ($article->getElementsByTagName('img') as $img) {
|
|
/** @var DOMElement $img */
|
|
/*
|
|
* Extract all possible sources of img url and select the first one on the list.
|
|
*/
|
|
$url = [
|
|
$img->getAttribute('src'),
|
|
$img->getAttribute('data-src'),
|
|
$img->getAttribute('data-original'),
|
|
$img->getAttribute('data-orig'),
|
|
$img->getAttribute('data-url')
|
|
];
|
|
|
|
$src = array_filter($url);
|
|
$src = reset($src);
|
|
if ($src) {
|
|
$this->logger->debug(sprintf('[PostProcess] Converting image URL to absolute URI: \'%s\'', substr($src, 0, 128)));
|
|
|
|
$img->setAttribute('src', $this->toAbsoluteURI($src));
|
|
}
|
|
}
|
|
}
|
|
|
|
$this->_cleanClasses($article);
|
|
|
|
return $article;
|
|
}
|
|
|
|
/**
|
|
* @return null|string
|
|
*/
|
|
public function __toString()
|
|
{
|
|
return sprintf('<h1>%s</h1>%s', $this->getTitle(), $this->getContent());
|
|
}
|
|
|
|
/**
|
|
* @return string|null
|
|
*/
|
|
public function getTitle()
|
|
{
|
|
return $this->title;
|
|
}
|
|
|
|
/**
|
|
* @param string $title
|
|
*/
|
|
protected function setTitle($title)
|
|
{
|
|
$this->title = $title;
|
|
}
|
|
|
|
/**
|
|
* @return string|null
|
|
*/
|
|
public function getContent()
|
|
{
|
|
return ($this->content instanceof DOMDocument) ? $this->content->C14N() : null;
|
|
}
|
|
|
|
/**
|
|
* @return DOMDocument|null
|
|
*/
|
|
public function getDOMDocument()
|
|
{
|
|
return $this->content;
|
|
}
|
|
|
|
/**
|
|
* @param DOMDocument $content
|
|
*/
|
|
protected function setContent(DOMDocument $content)
|
|
{
|
|
$this->content = $content;
|
|
}
|
|
|
|
/**
|
|
* @return null|string
|
|
*/
|
|
public function getExcerpt()
|
|
{
|
|
return $this->excerpt;
|
|
}
|
|
|
|
/**
|
|
* @param null|string $excerpt
|
|
*/
|
|
public function setExcerpt($excerpt)
|
|
{
|
|
$this->excerpt = $excerpt;
|
|
}
|
|
|
|
/**
|
|
* @return string|null
|
|
*/
|
|
public function getImage()
|
|
{
|
|
return $this->image;
|
|
}
|
|
|
|
/**
|
|
* @param string $image
|
|
*/
|
|
protected function setImage($image)
|
|
{
|
|
$this->image = $image;
|
|
}
|
|
|
|
/**
|
|
* @return string|null
|
|
*/
|
|
public function getAuthor()
|
|
{
|
|
return $this->author;
|
|
}
|
|
|
|
/**
|
|
* @param string $author
|
|
*/
|
|
protected function setAuthor($author)
|
|
{
|
|
$this->author = $author;
|
|
}
|
|
|
|
/**
|
|
* @return string|null
|
|
*/
|
|
public function getSiteName()
|
|
{
|
|
return $this->siteName;
|
|
}
|
|
|
|
/**
|
|
* @param string $siteName
|
|
*/
|
|
protected function setSiteName($siteName)
|
|
{
|
|
$this->siteName = $siteName;
|
|
}
|
|
|
|
/**
|
|
* @return null|string
|
|
*/
|
|
public function getDirection()
|
|
{
|
|
return $this->direction;
|
|
}
|
|
|
|
/**
|
|
* @param null|string $direction
|
|
*/
|
|
public function setDirection($direction)
|
|
{
|
|
$this->direction = $direction;
|
|
}
|
|
}
|