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<?php
/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
namespace Icinga\Protocol\File;
use Icinga\Util\EnumeratingFilterIterator;
use Icinga\Util\File;
/**
* Class FileIterator
*
* Iterate over a file, yielding only fields of non-empty lines which match a PCRE expression
*/
class FileIterator extends EnumeratingFilterIterator
{
/**
* A PCRE string with the fields to extract from the file's lines as named subpatterns
*
* @var string
*/
protected $fields;
/**
* An associative array of the current line's fields ($field => $value)
*
* @var array
*/
protected $currentData;
public function __construct($filename, $fields)
{
$this->fields = $fields;
$f = new File($filename);
$f->setFlags(
File::DROP_NEW_LINE |
File::READ_AHEAD |
File::SKIP_EMPTY
);
parent::__construct($f);
}
/**
* Return the current data
*
* @return array
*/
public function current(): array
{
return $this->currentData;
}
/**
* Accept lines matching the given PCRE pattern
*
* @return bool
*
* @throws FileReaderException If PHP failed parsing the PCRE pattern
*/
public function accept(): bool
{
$data = array();
$matched = preg_match(
$this->fields,
$this->getInnerIterator()->current(),
$data
);
if ($matched === false) {
throw new FileReaderException('Failed parsing regular expression!');
} elseif ($matched === 1) {
foreach ($data as $key => $value) {
if (is_int($key)) {
unset($data[$key]);
}
}
$this->currentData = $data;
return true;
}
return false;
}
}
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