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<?php
/**
* Piwik - free/libre analytics platform
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
*/
namespace Piwik\DataTable\Filter;
use Piwik\DataTable;
use Piwik\DataTable\BaseFilter;
/**
* Deletes every row for which a specific column does not match a supplied regex pattern.
*
* **Example**
*
* // filter out all rows whose labels doesn't start with piwik
* $dataTable->filter('Pattern', array('label', '^piwik'));
*
* @api
*/
class Pattern extends BaseFilter
{
/**
* @var string|array
*/
private $columnToFilter;
private $patternToSearch;
private $patternToSearchQuoted;
private $invertedMatch;
/**
* Constructor.
*
* @param DataTable $table The table to eventually filter.
* @param string $columnToFilter The column to match with the `$patternToSearch` pattern.
* @param string $patternToSearch The regex pattern to use.
* @param bool $invertedMatch Whether to invert the pattern or not. If true, will remove
* rows if they match the pattern.
*/
public function __construct($table, $columnToFilter, $patternToSearch, $invertedMatch = false)
{
parent::__construct($table);
$this->patternToSearch = $patternToSearch;
$this->patternToSearchQuoted = self::getPatternQuoted($patternToSearch);
$this->columnToFilter = $columnToFilter;
$this->invertedMatch = $invertedMatch;
}
/**
* Helper method to return the given pattern quoted
*
* @param string $pattern
* @return string
* @ignore
*/
public static function getPatternQuoted($pattern)
{
return '/' . str_replace('/', '\/', $pattern) . '/';
}
/**
* Performs case insensitive match
*
* @param string $patternQuoted
* @param string $string
* @param bool $invertedMatch
* @return int
* @ignore
*/
public static function match($patternQuoted, $string, $invertedMatch = false)
{
return preg_match($patternQuoted . "i", $string) == 1 ^ $invertedMatch;
}
/**
* See {@link Pattern}.
*
* @param DataTable $table
*/
public function filter($table)
{
foreach ($table->getRows() as $key => $row) {
//instead search must handle
// - negative search with -piwik
// - exact match with ""
// see (?!pattern) A subexpression that performs a negative lookahead search, which matches the search string at any point where a string not matching pattern begins.
$value = $row->getColumn($this->columnToFilter);
if ($value === false) {
$value = $row->getMetadata($this->columnToFilter);
}
if (!self::match($this->patternToSearchQuoted, $value, $this->invertedMatch)) {
$table->deleteRow($key);
}
}
}
/**
* See {@link Pattern}.
*
* @param array $array
* @return array
*/
public function filterArray($array)
{
$newArray = array();
foreach ($array as $key => $row) {
foreach ($this->columnToFilter as $column) {
if (!array_key_exists($column, $row)) {
continue;
}
if (self::match($this->patternToSearchQuoted, $row[$column], $this->invertedMatch)) {
$newArray[$key] = $row;
continue 2;
}
}
}
return $newArray;
}
}
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