softberg /
quantum-php-core
| Total Complexity | 44 |
| Total Lines | 346 |
| Duplicated Lines | 0 % |
| Changes | 8 | ||
| Bugs | 0 | Features | 0 |
Complex classes like BasePaginator often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use BasePaginator, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 5 | abstract class BasePaginator implements PaginatorInterface |
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| 6 | { |
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| 7 | /** |
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| 8 | * @var string |
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| 9 | */ |
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| 10 | protected const PAGINATION_CLASS = 'pagination'; |
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| 11 | |||
| 12 | /** |
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| 13 | * @var string |
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| 14 | */ |
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| 15 | protected const PAGINATION_CLASS_ACTIVE = 'active'; |
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| 16 | |||
| 17 | /** |
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| 18 | * @var string |
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| 19 | */ |
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| 20 | protected const PER_PAGE = 'per_page'; |
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| 21 | |||
| 22 | /** |
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| 23 | * @var string |
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| 24 | */ |
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| 25 | protected const PAGE = 'page'; |
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| 26 | |||
| 27 | /** |
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| 28 | * @var int |
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| 29 | */ |
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| 30 | protected const FIRST_PAGE_NUMBER = 1; |
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| 31 | |||
| 32 | /** |
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| 33 | * @var int |
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| 34 | */ |
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| 35 | protected const MINIMUM_PAGE_ITEMS_COUNT = 3; |
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| 36 | |||
| 37 | /** |
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| 38 | * @var int |
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| 39 | */ |
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| 40 | protected const EDGE_PADDING = 3; |
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| 41 | |||
| 42 | /** |
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| 43 | * @var int |
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| 44 | */ |
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| 45 | protected $total; |
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| 46 | |||
| 47 | /** |
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| 48 | * @var string |
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| 49 | */ |
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| 50 | protected $baseUrl; |
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| 51 | |||
| 52 | /** |
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| 53 | * @var int |
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| 54 | */ |
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| 55 | protected $perPage; |
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| 56 | |||
| 57 | /** |
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| 58 | * @var int |
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| 59 | */ |
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| 60 | protected $page; |
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| 61 | |||
| 62 | /** |
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| 63 | * @return int |
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| 64 | */ |
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| 65 | public function currentPageNumber(): int |
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| 66 | { |
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| 67 | return $this->page; |
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| 68 | } |
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| 69 | |||
| 70 | /** |
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| 71 | * @param bool $withBaseUrl |
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| 72 | * @return string|null |
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| 73 | */ |
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| 74 | public function currentPageLink(bool $withBaseUrl = false): ?string |
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| 75 | { |
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| 76 | return $this->getPageLink($this->page, $withBaseUrl); |
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| 77 | } |
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| 78 | |||
| 79 | /** |
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| 80 | * @return int|null |
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| 81 | */ |
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| 82 | public function previousPageNumber(): ?int |
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| 83 | { |
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| 84 | $previous = null; |
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| 85 | if ($this->page > 1) { |
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| 86 | $previous = $this->page - 1; |
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| 87 | } elseif ($this->page == 1) { |
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| 88 | $previous = $this->page; |
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| 89 | } |
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| 90 | |||
| 91 | return $previous; |
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| 92 | } |
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| 93 | |||
| 94 | /** |
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| 95 | * @param bool $withBaseUrl |
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| 96 | * @return string|null |
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| 97 | */ |
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| 98 | public function previousPageLink(bool $withBaseUrl = false): ?string |
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| 99 | { |
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| 100 | return $this->getPageLink($this->previousPageNumber(), $withBaseUrl); |
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| 101 | } |
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| 102 | |||
| 103 | /** |
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| 104 | * @return int|null |
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| 105 | */ |
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| 106 | public function nextPageNumber(): ?int |
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| 107 | { |
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| 108 | $next = null; |
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| 109 | if ($this->page < $this->lastPageNumber()) { |
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| 110 | $next = $this->page + 1; |
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| 111 | } elseif ($this->page == $this->lastPageNumber()) { |
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| 112 | $next = $this->page; |
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| 113 | } |
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| 114 | return $next; |
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| 115 | } |
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| 116 | |||
| 117 | /** |
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| 118 | * @param bool $withBaseUrl |
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| 119 | * @return string|null |
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| 120 | */ |
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| 121 | public function nextPageLink(bool $withBaseUrl = false): ?string |
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| 122 | { |
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| 123 | return $this->getPageLink($this->nextPageNumber(), $withBaseUrl); |
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| 124 | } |
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| 125 | |||
| 126 | /** |
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| 127 | * @param bool $withBaseUrl |
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| 128 | * @return string|null |
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| 129 | */ |
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| 130 | public function firstPageLink(bool $withBaseUrl = false): ?string |
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| 131 | { |
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| 132 | return $this->getPageLink(self::FIRST_PAGE_NUMBER, $withBaseUrl); |
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| 133 | } |
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| 134 | |||
| 135 | /** |
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| 136 | * @return int |
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| 137 | */ |
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| 138 | public function lastPageNumber(): int |
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| 139 | { |
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| 140 | return (int)ceil($this->total() / $this->perPage); |
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| 141 | } |
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| 142 | |||
| 143 | /** |
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| 144 | * @param bool $withBaseUrl |
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| 145 | * @return string|null |
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| 146 | */ |
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| 147 | public function lastPageLink(bool $withBaseUrl = false): ?string |
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| 148 | { |
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| 149 | return $this->getPageLink($this->lastPageNumber(), $withBaseUrl); |
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| 150 | } |
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| 151 | |||
| 152 | /** |
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| 153 | * @return int |
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| 154 | */ |
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| 155 | public function perPage(): int |
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| 156 | { |
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| 157 | return $this->perPage; |
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| 158 | } |
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| 159 | |||
| 160 | /** |
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| 161 | * @return int |
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| 162 | */ |
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| 163 | public function total(): int |
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| 164 | { |
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| 165 | return $this->total; |
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| 166 | } |
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| 167 | |||
| 168 | /** |
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| 169 | * @param bool $withBaseUrl |
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| 170 | * @return array |
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| 171 | */ |
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| 172 | public function links(bool $withBaseUrl = false): array |
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| 180 | } |
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| 181 | |||
| 182 | /** |
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| 183 | * @param bool $withBaseUrl |
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| 184 | * @return string |
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| 185 | */ |
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| 186 | protected function getUri(bool $withBaseUrl = false): string |
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| 198 | } |
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| 199 | |||
| 200 | /** |
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| 201 | * @param $pageNumber |
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| 202 | * @param bool $withBaseUrl |
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| 203 | * @return string|null |
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| 204 | */ |
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| 205 | protected function getPageLink($pageNumber, bool $withBaseUrl = false): ?string |
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| 206 | { |
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| 207 | if (!empty($pageNumber)){ |
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| 208 | return $this->getUri($withBaseUrl) . self::PER_PAGE .'=' . $this->perPage . '&'. self::PAGE .'=' . $pageNumber; |
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| 209 | } |
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| 210 | return null; |
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| 211 | } |
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| 212 | |||
| 213 | /** |
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| 214 | * @param bool $withBaseUrl |
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| 215 | * @param $pageItemsCount |
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| 216 | * @return string|null |
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| 217 | */ |
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| 218 | public function getPagination(bool $withBaseUrl = false, $pageItemsCount = null): ?string |
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| 219 | { |
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| 220 | $totalPages = $this->lastPageNumber(); |
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| 221 | if ($totalPages <= 1) { |
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| 222 | return null; |
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| 223 | } |
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| 224 | |||
| 225 | if (!is_null($pageItemsCount) && $pageItemsCount < self::MINIMUM_PAGE_ITEMS_COUNT) { |
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| 226 | $pageItemsCount = self::MINIMUM_PAGE_ITEMS_COUNT; |
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| 227 | } |
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| 228 | |||
| 229 | $pagination = '<ul class="'. self::PAGINATION_CLASS .'">'; |
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| 230 | $currentPage = $this->currentPageNumber(); |
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| 231 | |||
| 232 | if ($currentPage > 1) { |
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| 233 | $pagination .= $this->getPreviousPageItem($this->previousPageLink()); |
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| 234 | } |
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| 235 | |||
| 236 | if ($pageItemsCount) { |
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| 237 | $links = $this->links($withBaseUrl); |
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| 238 | $startPage = $this->calculateStartPage($currentPage, $pageItemsCount); |
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| 239 | $endPage = $this->calculateEndPage($startPage, $totalPages, $pageItemsCount); |
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| 240 | $pagination = $this->addFirstPageLink($pagination, $startPage); |
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| 241 | $pagination = $this->getItemsLinks($pagination, $startPage, $endPage, $currentPage, $links); |
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| 242 | $pagination = $this->addLastPageLink($pagination, $endPage, $totalPages, $links); |
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| 243 | } |
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| 244 | |||
| 245 | if ($currentPage < $totalPages) { |
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| 246 | $pagination .= $this->getNextPageItem($this->nextPageLink()); |
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| 247 | } |
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| 248 | |||
| 249 | $pagination .= '</ul>'; |
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| 250 | |||
| 251 | return $pagination; |
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| 252 | } |
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| 253 | |||
| 254 | /** |
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| 255 | * @param string|null $nextPageLink |
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| 256 | * @return string |
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| 257 | */ |
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| 258 | protected function getNextPageItem(?string $nextPageLink): string |
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| 259 | { |
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| 260 | $link = ''; |
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| 261 | if (!empty($nextPageLink)){ |
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| 262 | $link = '<li><a href="' . $nextPageLink . '">Next »</a></li>'; |
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| 263 | } |
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| 264 | return $link; |
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| 265 | } |
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| 266 | |||
| 267 | /** |
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| 268 | * @param string|null $previousPageLink |
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| 269 | * @return string |
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| 270 | */ |
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| 271 | protected function getPreviousPageItem(?string $previousPageLink): string |
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| 278 | } |
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| 279 | |||
| 280 | /** |
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| 281 | * @param $pagination |
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| 282 | * @param $startPage |
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| 283 | * @param $endPage |
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| 284 | * @param $currentPage |
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| 285 | * @param array $links |
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| 286 | * @return mixed|string |
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| 287 | */ |
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| 288 | protected function getItemsLinks($pagination, $startPage, $endPage, $currentPage, array $links) |
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| 289 | { |
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| 290 | for ($i = $startPage; $i <= $endPage; $i++) { |
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| 291 | $active = $i == $currentPage ? 'class="'. self::PAGINATION_CLASS_ACTIVE .'"' : ''; |
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| 292 | $pagination .= '<li ' . $active . '><a href="' . $links[$i - 1] . '">' . $i . '</a></li>'; |
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| 293 | } |
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| 294 | return $pagination; |
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| 295 | } |
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| 296 | |||
| 297 | /** |
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| 298 | * @param $currentPage |
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| 299 | * @param $pageItemsCount |
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| 300 | * @return mixed |
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| 301 | */ |
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| 302 | protected function calculateStartPage($currentPage, $pageItemsCount) |
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| 303 | { |
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| 304 | return max(1, $currentPage - ceil(($pageItemsCount - self::EDGE_PADDING) / 2)); |
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| 305 | } |
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| 306 | |||
| 307 | /** |
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| 308 | * @param $startPage |
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| 309 | * @param $totalPages |
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| 310 | * @param $pageItemsCount |
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| 311 | * @return mixed |
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| 312 | */ |
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| 313 | protected function calculateEndPage($startPage, $totalPages, $pageItemsCount) |
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| 314 | { |
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| 315 | $endPage = min($totalPages, $startPage + $pageItemsCount - self::EDGE_PADDING); |
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| 316 | return max(1, $endPage - $pageItemsCount + self::EDGE_PADDING); |
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| 317 | } |
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| 318 | |||
| 319 | /** |
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| 320 | * @param $pagination |
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| 321 | * @param $startPage |
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| 322 | * @return mixed|string |
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| 323 | */ |
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| 324 | protected function addFirstPageLink($pagination, $startPage) |
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| 333 | } |
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| 334 | |||
| 335 | /** |
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| 336 | * @param $pagination |
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| 337 | * @param $endPage |
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| 338 | * @param $totalPages |
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| 339 | * @param $links |
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| 340 | * @return mixed|string |
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| 341 | */ |
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| 342 | protected function addLastPageLink($pagination, $endPage, $totalPages, $links) |
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| 351 | } |
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| 352 | } |
