/**
* This method will try to extract link & transform it according to rules defined in config.
*
* @param $string
*
* @return bool|mixed $string false|string Will return title or false if extraction didn't produced any result.
* @throws RegexException Supplied extraction/transform regex is invalid.
*/
public function extractLink($string)
{
$matchResult = @preg_match($this->configuration->getLinkExtractPattern(), $string, $matches);
if ($matchResult === false) {
throw new RegexException('Pattern was configured for ' . $this->getName() . ' aggregator to extract link', $this->configuration->getLinkExtractPattern());
} elseif ($matchResult === 0 || !isset($matches[1])) {
return false;
} elseif (isset($matches[2])) {
$this->logger->warning('Pattern ' . $this->configuration->getLinkExtractPattern() . ' configured in ' . $this->getName() . ' aggregator to extract link resulted in ' . (count($matches) - 1) . ' matches instead of one for input string "' . $string . '". Only first one will be used.');
}
$transformPattern = $this->configuration->getLinkTransformPattern();
if ($transformPattern !== null) {
//Check if transformation is needed
$matches[1] = @preg_replace($transformPattern[0], $transformPattern[1], $matches[1]);
if ($matches[1] === null) {
//PHP weirdo - null will be returned for error
throw new RegexException('Pattern was configured for ' . $this->getName() . ' aggregator to transform link', "[{$transformPattern[0]}, {$transformPattern[0]}]");
}
}
return $matches[1];
}
/**
* @dataProvider exampleLinkTransformPatternsProvider
*/
public function testLinkTransformPatternCanBeSetToCorrectValues($pattern)
{
$this->subjectUnderTest->setLinkTransformPattern($pattern);
$this->assertSame($pattern, $this->subjectUnderTest->getLinkTransformPattern());
}
