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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Pagination handler class. |
| 5 | * |
| 6 | * This Source Code Form is subject to the terms of the Mozilla Public License, |
| 7 | * v. 2.0. If a copy of the MPL was not distributed with this file, You can |
| 8 | * obtain one at https://mozilla.org/MPL/2.0/. |
| 9 | * |
| 10 | * @package phpMyFAQ |
| 11 | * @author Anatoliy Belsky <ab@php.net> |
| 12 | * @author Thorsten Rinne <thorsten@phpmyfaq.de> |
| 13 | * @copyright 2009-2026 phpMyFAQ Team |
| 14 | * @license https://www.mozilla.org/MPL/2.0/ Mozilla Public License Version 2.0 |
| 15 | * @link https://www.phpmyfaq.de |
| 16 | * @since 2009-09-27 |
| 17 | */ |
| 18 | |
| 19 | declare(strict_types=1); |
| 20 | |
| 21 | namespace phpMyFAQ; |
| 22 | |
| 23 | use phpMyFAQ\Pagination\PaginationTemplates; |
| 24 | use phpMyFAQ\Pagination\UrlConfig; |
| 25 | |
| 26 | /** |
| 27 | * Class Pagination |
| 28 | */ |
| 29 | class Pagination |
| 30 | { |
| 31 | private const string TPL_VAR_LINK_URL = '{LINK_URL}'; |
| 32 | private const string TPL_VAR_LINK_TEXT = '{LINK_TEXT}'; |
| 33 | private const string TPL_VAR_LAYOUT_CONTENT = '{LAYOUT_CONTENT}'; |
| 34 | |
| 35 | private int $currentPage; |
| 36 | |
| 37 | public string $baseUrl { |
| 38 | set { |
| 39 | $this->baseUrl = $value; |
| 40 | $this->currentPage = $this->getCurrentPageFromUrl($value); |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | public int $total { |
| 45 | set => $this->total = max(0, $value); |
| 46 | } |
| 47 | |
| 48 | public int $perPage { |
| 49 | set => $this->perPage = max(1, $value); |
| 50 | } |
| 51 | |
| 52 | public int $adjacent { |
| 53 | set => $this->adjacent = max(1, $value); |
| 54 | } |
| 55 | |
| 56 | public function __construct( |
| 57 | string $baseUrl = '', |
| 58 | int $total = 0, |
| 59 | int $perPage = 10, |
| 60 | public readonly PaginationTemplates $templates = new PaginationTemplates(), |
| 61 | public readonly UrlConfig $urlConfig = new UrlConfig(), |
| 62 | int $adjacent = 4, |
| 63 | ) { |
| 64 | $this->adjacent = $adjacent; |
| 65 | $this->perPage = $perPage; |
| 66 | $this->total = $total; |
| 67 | $this->baseUrl = $baseUrl; |
| 68 | } |
| 69 | |
| 70 | protected function getCurrentPageFromUrl(string $url): int |
| 71 | { |
| 72 | $page = 1; |
| 73 | |
| 74 | if ($url !== '' && $url !== '0') { |
| 75 | $match = []; |
| 76 | if (Strings::preg_match('/[?&]' . $this->urlConfig->pageParamName . '=(\d+)/', $url, $match) !== 0) { |
| 77 | $page = $match[1] ?? $page; |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | return (int) $page; |
| 82 | } |
| 83 | |
| 84 | public function render(): string |
| 85 | { |
| 86 | $pages = (int) ceil($this->total / $this->perPage); |
| 87 | $content = $this->renderPageNumbers($pages); |
| 88 | $content = $this->addNavigationButtons($content, $pages); |
| 89 | |
| 90 | return $this->renderLayout(implode(separator: ' ', array: $content)); |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * @return string[] |
| 95 | */ |
| 96 | protected function renderPageNumbers(int $pages): array |
| 97 | { |
| 98 | $content = []; |
| 99 | $adjacent = (int) max(floor($this->adjacent / 2), 1); |
| 100 | |
| 101 | for ($page = 1; $page <= $pages; ++$page) { |
| 102 | if ($this->shouldSkipBeforeCurrentPage($page, $adjacent)) { |
| 103 | $content[] = '<li class="disabled"><a>…</a></li>'; |
| 104 | $page = $this->currentPage - $adjacent - 1; |
| 105 | continue; |
| 106 | } |
| 107 | |
| 108 | if ($this->shouldSkipAfterCurrentPage($page, $adjacent, $pages)) { |
| 109 | $content[] = '<li class="disabled"><a>…</a></li>'; |
| 110 | $page = $pages - $this->adjacent; |
| 111 | continue; |
| 112 | } |
| 113 | |
| 114 | $content[] = $this->renderPageLink($page); |
| 115 | } |
| 116 | |
| 117 | return $content; |
| 118 | } |
| 119 | |
| 120 | protected function shouldSkipBeforeCurrentPage(int $page, int $adjacent): bool |
| 121 | { |
| 122 | return $page > $this->adjacent && $page < ($this->currentPage - $adjacent); |
| 123 | } |
| 124 | |
| 125 | protected function shouldSkipAfterCurrentPage(int $page, int $adjacent, int $totalPages): bool |
| 126 | { |
| 127 | return $page > ($this->currentPage + $adjacent) && $page <= ($totalPages - $this->adjacent); |
| 128 | } |
| 129 | |
| 130 | protected function renderPageLink(int $page): string |
| 131 | { |
| 132 | $link = $this->renderUrl($this->baseUrl, $page); |
| 133 | $template = $page === $this->currentPage ? $this->templates->currentPage : $this->templates->link; |
| 134 | |
| 135 | return $this->renderLink($template, $link, $page); |
| 136 | } |
| 137 | |
| 138 | /* @mago-expect lint:halstead - renders the full pagination control in one method */ |
| 139 | /** |
| 140 | * @param string[] $content |
| 141 | * @return string[] |
| 142 | */ |
| 143 | protected function addNavigationButtons(array $content, int $pages): array |
| 144 | { |
| 145 | if (1 < $this->currentPage) { |
| 146 | array_unshift($content, $this->renderLink( |
| 147 | $this->templates->prevPage, |
| 148 | $this->renderUrl($this->baseUrl, $this->currentPage - 1), |
| 149 | $this->currentPage - 1, |
| 150 | )); |
| 151 | array_unshift($content, $this->renderLink( |
| 152 | $this->templates->firstPage, |
| 153 | $this->renderUrl($this->baseUrl, page: 1), |
| 154 | linkText: 1, |
| 155 | )); |
| 156 | } |
| 157 | |
| 158 | if ($pages > $this->currentPage) { |
| 159 | $content[] = $this->renderLink( |
| 160 | $this->templates->nextPage, |
| 161 | $this->renderUrl($this->baseUrl, $this->currentPage + 1), |
| 162 | $this->currentPage + 1, |
| 163 | ); |
| 164 | $content[] = $this->renderLink( |
| 165 | $this->templates->lastPage, |
| 166 | $this->renderUrl($this->baseUrl, $pages), |
| 167 | $pages, |
| 168 | ); |
| 169 | } |
| 170 | |
| 171 | return $content; |
| 172 | } |
| 173 | |
| 174 | protected function renderUrl(string $url = '', int $page = 1): string |
| 175 | { |
| 176 | if ($url === '') { |
| 177 | return sprintf($this->urlConfig->rewriteUrl, $page); |
| 178 | } |
| 179 | |
| 180 | $urlToParse = '%s%s%s=%d'; |
| 181 | $replacedUrl = Strings::preg_replace( |
| 182 | ['/[?&](amp;|)' . $this->urlConfig->pageParamName . '=(\d+)/'], |
| 183 | replacement: '', |
| 184 | subject: $url, |
| 185 | ); |
| 186 | $cleanedUrl = is_string($replacedUrl) ? $replacedUrl : $url; |
| 187 | $separator = str_contains($cleanedUrl, needle: '?') ? '&' : '?'; |
| 188 | return sprintf($urlToParse, $cleanedUrl, $separator, $this->urlConfig->pageParamName, $page); |
| 189 | } |
| 190 | |
| 191 | protected function renderLink(string $tpl, string $url, string|int|float $linkText): string |
| 192 | { |
| 193 | $search = [self::TPL_VAR_LINK_URL, self::TPL_VAR_LINK_TEXT]; |
| 194 | $replace = [$url, (string) $linkText]; |
| 195 | |
| 196 | return str_replace($search, $replace, $tpl); |
| 197 | } |
| 198 | |
| 199 | protected function renderLayout(string $content): string |
| 200 | { |
| 201 | return str_replace(self::TPL_VAR_LAYOUT_CONTENT, $content, $this->templates->layout); |
| 202 | } |
| 203 | } |