/**
* Gets the browser data formatr for the given user agent
* (or null if no data avaailble, no even the default browser)
*
* @param string $userAgent
* @return FormatterInterface|null
*/
public function getBrowser($userAgent)
{
$userAgent = strtolower($userAgent);
$formatter = null;
foreach ($this->patternHelper->getPatterns($userAgent) as $patterns) {
$patternToMatch = '/^(?:' . str_replace("\t", ')|(?:', $patterns) . ')$/i';
if (!preg_match($patternToMatch, $userAgent)) {
continue;
}
// strtok() requires less memory than explode()
$pattern = strtok($patterns, "\t");
while ($pattern !== false) {
$pattern = str_replace('[\\d]', '(\\d)', $pattern);
$quotedPattern = '/^' . $pattern . '$/i';
$matches = [];
if (preg_match($quotedPattern, $userAgent, $matches)) {
// Insert the digits back into the pattern, so that we can search the settings for it
if (count($matches) > 1) {
array_shift($matches);
foreach ($matches as $oneMatch) {
$numPos = strpos($pattern, '(\\d)');
$pattern = substr_replace($pattern, $oneMatch, $numPos, 4);
}
}
// Try to get settings - as digits have been replaced to speed up the pattern search (up to 90 faster),
// we won't always find the data in the first step - so check if settings have been found and if not,
// search for the next pattern.
$settings = $this->dataHelper->getSettings($pattern);
if (count($settings) > 0) {
$formatter = $this->formatter;
$formatter->setData($settings);
break 2;
}
}
$pattern = strtok("\t");
}
}
return $formatter;
}
