wikimedia/mediawiki-extensions-Wikibase

<?php

namespace Wikibase\Lib\Units;

/**
 * CSV-based unit conversion storage.
 * The units are stored as:
 *       Qsource,factor,QstandardUnit
 * E.g.: Q130964,4.19,Q25269
 *
 * @license GPL-2.0-or-later
 * @author Stas Malyshev
 */
class CSVUnitStorage extends BaseUnitStorage {

    /**
     * Filename of the source file
     * @var string
     */
    private $sourceFile;

    /**
     * @param string $fileName Filename of the storage file.
     */
    public function __construct( $fileName ) {
        $this->sourceFile = $fileName;
    }

    /**
     * Load data from concrete storage
     * @return array[]|null
     */
    protected function loadStorageData() {
        if ( !is_readable( $this->sourceFile ) ) {
            return null;
        }
        $f = fopen( $this->sourceFile, 'r' );
        if ( !$f ) {
            return null;
        }
        $data = [];
        for ( $row = fgetcsv( $f ); $row !== false; $row = fgetcsv( $f ) ) {
            // @phan-suppress-next-line PhanTypeMismatchDimAssignment False positive
            $data[$row[0]] = array_slice( $row, 1 );
        }
        return $data;
    }

}