DateFormat.php

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<?php
/* Copyright (c) 2019 Nils Haagen <nils.haagen@concepts-and-training.de> Extended GPL, see docs/LICENSE */

namespace ILIAS\Data\DateFormat;

class DateFormat
{
    const DOT = '.';
    const COMMA = ',';
    const DASH = '-';
    const SLASH = '/';
    const SPACE = ' ';
    const DAY = 'd';
    const DAY_ORDINAL = 'jS';
    const WEEKDAY = 'l';
    const WEEKDAY_SHORT = 'D';
    const WEEK = 'W';
    const MONTH = 'm';
    const MONTH_SPELLED = 'F';
    const MONTH_SPELLED_SHORT = 'M';
    const YEAR = 'Y';
    const YEAR_TWO_DIG = 'y';

    const TOKENS = [
        self::DOT,
        self::COMMA,
        self::DASH,
        self::SLASH,
        self::SPACE,
        self::DAY,
        self::DAY_ORDINAL,
        self::WEEKDAY,
        self::WEEKDAY_SHORT,
        self::WEEK,
        self::MONTH,
        self::MONTH_SPELLED,
        self::MONTH_SPELLED_SHORT,
        self::YEAR,
        self::YEAR_TWO_DIG
    ];

    protected $format = [];

    public function __construct(array $format)
    {
        $this->validateFormatElelements($format);
        $this->format = $format;
    }

    public function validateFormatElelements(array $format)
    {
        foreach ($format as $entry) {
            if (!in_array($entry, self::TOKENS)) {
                throw new \InvalidArgumentException("not a valid token for date-format", 1);
            }
        }
    }

    public function toArray() : array
    {
        return $this->format;
    }

    public function toString() : string
    {
        return implode('', $this->format);
    }
}