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| 1 | <?php |
| 2 | declare(strict_types=1); |
| 3 | /** |
| 4 | * Pop PHP Framework (https://www.popphp.org/) |
| 5 | * |
| 6 | * @link https://github.com/popphp/popphp-framework |
| 7 | * @author Nick Sagona, III <dev@noladev.com> |
| 8 | * @copyright Copyright (c) 2009-2027 NOLA Interactive, LLC. |
| 9 | * @license https://www.popphp.org/license New BSD License |
| 10 | */ |
| 11 | |
| 12 | /** |
| 13 | * @namespace |
| 14 | */ |
| 15 | namespace Pop\Paginator; |
| 16 | |
| 17 | /** |
| 18 | * Abstract paginator type class |
| 19 | * |
| 20 | * @category Pop |
| 21 | * @package Pop\Paginator |
| 22 | * @author Nick Sagona, III <dev@noladev.com> |
| 23 | * @copyright Copyright (c) 2009-2027 NOLA Interactive, LLC. |
| 24 | * @license https://www.popphp.org/license New BSD License |
| 25 | * @version 4.1.0 |
| 26 | */ |
| 27 | abstract class AbstractPaginator implements PaginatorInterface |
| 28 | { |
| 29 | |
| 30 | /** |
| 31 | * Total number of items |
| 32 | * @var int |
| 33 | */ |
| 34 | protected int $total = 0; |
| 35 | |
| 36 | /** |
| 37 | * Number of items per page |
| 38 | * @var int |
| 39 | */ |
| 40 | protected int $perPage = 10; |
| 41 | |
| 42 | /** |
| 43 | * Range of pages per page |
| 44 | * @var int |
| 45 | */ |
| 46 | protected int $range = 10; |
| 47 | |
| 48 | /** |
| 49 | * Query key |
| 50 | * @var string |
| 51 | */ |
| 52 | protected string $queryKey = 'page'; |
| 53 | |
| 54 | /** |
| 55 | * Current page property |
| 56 | * @var int |
| 57 | */ |
| 58 | protected int $currentPage = 1; |
| 59 | |
| 60 | /** |
| 61 | * Number of pages property |
| 62 | * @var ?int |
| 63 | */ |
| 64 | protected ?int $numberOfPages = null; |
| 65 | |
| 66 | /** |
| 67 | * Current page start index property |
| 68 | * @var ?int |
| 69 | */ |
| 70 | protected ?int $start = null; |
| 71 | |
| 72 | /** |
| 73 | * Current page end index property |
| 74 | * @var ?int |
| 75 | */ |
| 76 | protected ?int $end = null; |
| 77 | |
| 78 | /** |
| 79 | * Page bookends |
| 80 | * @var array |
| 81 | */ |
| 82 | protected array $bookends = [ |
| 83 | 'start' => '«', |
| 84 | 'previous' => '‹', |
| 85 | 'next' => '›', |
| 86 | 'end' => '»' |
| 87 | ]; |
| 88 | |
| 89 | /** |
| 90 | * Constructor |
| 91 | * |
| 92 | * Instantiate the paginator object |
| 93 | * |
| 94 | * @param int $total |
| 95 | * @param int $perPage |
| 96 | * @param int $range |
| 97 | * @throws Exception |
| 98 | */ |
| 99 | public function __construct(int $total, int $perPage = 10, int $range = 10) |
| 100 | { |
| 101 | if ($total < 0) { |
| 102 | throw new Exception('Error: The total value must be zero or greater.'); |
| 103 | } |
| 104 | if ($perPage < 1) { |
| 105 | throw new Exception('Error: The per page value must be greater than zero.'); |
| 106 | } |
| 107 | if ($range < 1) { |
| 108 | throw new Exception('Error: The range value must be greater than zero.'); |
| 109 | } |
| 110 | |
| 111 | $this->total = $total; |
| 112 | $this->perPage = $perPage; |
| 113 | $this->range = $range; |
| 114 | |
| 115 | $this->calculateRange($this->currentPage); |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Set the query key |
| 120 | * |
| 121 | * @param string $key |
| 122 | * @return AbstractPaginator |
| 123 | */ |
| 124 | public function setQueryKey(string $key): AbstractPaginator |
| 125 | { |
| 126 | $this->queryKey = $key; |
| 127 | return $this; |
| 128 | } |
| 129 | |
| 130 | /** |
| 131 | * Set the bookends |
| 132 | * |
| 133 | * @param array $bookends |
| 134 | * @return AbstractPaginator |
| 135 | */ |
| 136 | public function setBookends(array $bookends): AbstractPaginator |
| 137 | { |
| 138 | if (array_key_exists('start', $bookends)) { |
| 139 | $this->bookends['start'] = $bookends['start']; |
| 140 | } |
| 141 | if (array_key_exists('previous', $bookends)) { |
| 142 | $this->bookends['previous'] = $bookends['previous']; |
| 143 | } |
| 144 | if (array_key_exists('next', $bookends)) { |
| 145 | $this->bookends['next'] = $bookends['next']; |
| 146 | } |
| 147 | if (array_key_exists('end', $bookends)) { |
| 148 | $this->bookends['end'] = $bookends['end']; |
| 149 | } |
| 150 | |
| 151 | return $this; |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Get the content items total |
| 156 | * |
| 157 | * @return int |
| 158 | */ |
| 159 | public function getTotal(): int |
| 160 | { |
| 161 | return $this->total; |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * Get the per page |
| 166 | * |
| 167 | * @return int |
| 168 | */ |
| 169 | public function getPerPage(): int |
| 170 | { |
| 171 | return $this->perPage; |
| 172 | } |
| 173 | |
| 174 | /** |
| 175 | * Get the page range |
| 176 | * |
| 177 | * @return int |
| 178 | */ |
| 179 | public function getRange(): int |
| 180 | { |
| 181 | return $this->range; |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * Get the query key |
| 186 | * |
| 187 | * @return string |
| 188 | */ |
| 189 | public function getQueryKey(): string |
| 190 | { |
| 191 | return $this->queryKey; |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * Get the current page |
| 196 | * |
| 197 | * @return int |
| 198 | */ |
| 199 | public function getCurrentPage(): int |
| 200 | { |
| 201 | return $this->currentPage; |
| 202 | } |
| 203 | |
| 204 | /** |
| 205 | * Get the number of pages |
| 206 | * |
| 207 | * @return int |
| 208 | */ |
| 209 | public function getNumberOfPages(): int |
| 210 | { |
| 211 | return $this->numberOfPages; |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * Get a bookend |
| 216 | * |
| 217 | * @param string $key |
| 218 | * @return string|null |
| 219 | */ |
| 220 | public function getBookend(string $key): string|null |
| 221 | { |
| 222 | return $this->bookends[$key] ?? null; |
| 223 | } |
| 224 | |
| 225 | /** |
| 226 | * Get the bookends |
| 227 | * |
| 228 | * @return array |
| 229 | */ |
| 230 | public function getBookends(): array |
| 231 | { |
| 232 | return $this->bookends; |
| 233 | } |
| 234 | |
| 235 | /** |
| 236 | * Calculate the page range |
| 237 | * |
| 238 | * @param int $page |
| 239 | * @return array |
| 240 | */ |
| 241 | public function calculateRange(int $page = 1): array |
| 242 | { |
| 243 | $this->currentPage = $page; |
| 244 | |
| 245 | // Calculate the number of pages based on the remainder. |
| 246 | $remainder = $this->total % $this->perPage; |
| 247 | $this->numberOfPages = ($remainder != 0) ? ((int)floor($this->total / $this->perPage) + 1) : |
| 248 | (int)floor($this->total / $this->perPage); |
| 249 | |
| 250 | // Calculate the start index. |
| 251 | $this->start = ($page * $this->perPage) - $this->perPage; |
| 252 | |
| 253 | // Calculate the end index. |
| 254 | if (($page == $this->numberOfPages) && ($remainder == 0)) { |
| 255 | $this->end = $this->start + $this->perPage; |
| 256 | } else if ($page == $this->numberOfPages) { |
| 257 | $this->end = (($page * $this->perPage) - ($this->perPage - $remainder)); |
| 258 | } else { |
| 259 | $this->end = ($page * $this->perPage); |
| 260 | } |
| 261 | |
| 262 | // Calculate if out of range. |
| 263 | if ($this->start >= $this->total) { |
| 264 | $this->start = 0; |
| 265 | $this->end = $this->perPage; |
| 266 | } |
| 267 | |
| 268 | // Check and calculate for any page ranges. |
| 269 | // If page is within the first range block. |
| 270 | if ($page <= $this->range) { |
| 271 | $range = [ |
| 272 | 'start' => 1, |
| 273 | 'end' => min($this->range, $this->numberOfPages), |
| 274 | 'prev' => false, |
| 275 | 'next' => ($this->numberOfPages > $this->range) |
| 276 | ]; |
| 277 | } else { |
| 278 | // The first page number of the last range block, regardless of whether |
| 279 | // the number of pages divides evenly into the range. |
| 280 | $lastBlockStart = max(1, ($this->range * (int)floor(($this->numberOfPages - 1) / $this->range)) + 1); |
| 281 | |
| 282 | // Else, if page is within the last range block. |
| 283 | if ($page >= $lastBlockStart) { |
| 284 | $range = [ |
| 285 | 'start' => $lastBlockStart, |
| 286 | 'end' => $this->numberOfPages, |
| 287 | 'prev' => true, |
| 288 | 'next' => false |
| 289 | ]; |
| 290 | // Else, if page is within a middle range block. |
| 291 | } else { |
| 292 | $posInRange = (($page % $this->range) == 0) ? ($this->range - 1) : (($page % $this->range) - 1); |
| 293 | $linkStart = $page - $posInRange; |
| 294 | $range = [ |
| 295 | 'start' => $linkStart, |
| 296 | 'end' => $linkStart + ($this->range - 1), |
| 297 | 'prev' => true, |
| 298 | 'next' => true |
| 299 | ]; |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | return $range; |
| 304 | } |
| 305 | |
| 306 | } |