| 1 | <?php |
| 2 | /************************************************************* |
| 3 | # 076 License |
| 4 | |
| 5 | Copyright (c) テクニカル諏訪子 |
| 6 | |
| 7 | Permission is hereby granted to any person obtaining a copy of the software |
| 8 | Little Beast (the "Software") to use, modify, merge, copy, publish, distribute, |
| 9 | sublicense, and/or sell copies of the Software, subject to the following conditions: |
| 10 | |
| 11 | 1. **Origin Attribution**: |
| 12 | - You must not misrepresent the origin of the Software; you must not claim |
| 13 | you created the original Software. |
| 14 | - If the Software is used in a product, you must either: |
| 15 | a. Provide clear attribution in the product's documentation, user interface, |
| 16 | or other visible areas, **OR** |
| 17 | b. Pay the original developers a fee they specify in writing. |
| 18 | 2. **Usage Restriction**: |
| 19 | - The Software, or any derivative works, dependencies, or libraries |
| 20 | incorporating it, must not be used for censorship or to suppress freedom of |
| 21 | speech, expression, or creativity. Prohibited uses include, but are not |
| 22 | limited to: |
| 23 | - Censorship of so-called "hate speech", visuals, non-mainstream opinions, |
| 24 | ideas, or objective reality. |
| 25 | - Tools or systems designed to restrict access to information or |
| 26 | artistic works. |
| 27 | 3. **Notice Preservation**: |
| 28 | - This license and the above copyright notice must remain intact in all copies |
| 29 | of the source code. |
| 30 | |
| 31 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
| 32 | INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A |
| 33 | PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT |
| 34 | HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF |
| 35 | CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE |
| 36 | OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 37 | */ |
| 38 | namespace Std\Lib; |
| 39 | |
| 40 | class DiffViewer { |
| 41 | private $diffContent; |
| 42 | |
| 43 | public function __construct(string $filePath) { |
| 44 | if (!file_exists($filePath)) { |
| 45 | throw new \Exception("Diff file not found: $filePath"); |
| 46 | } |
| 47 | $this->diffContent = file_get_contents($filePath); |
| 48 | } |
| 49 | |
| 50 | public function displaySideBySide(): string { |
| 51 | $files = $this->parse(); |
| 52 | |
| 53 | // 各ファイルにHTMLの出力の作成 |
| 54 | $html = ''; |
| 55 | foreach ($files as $f) { |
| 56 | $old = $f['old'] ?? $f['gitOld']; |
| 57 | $new = $f['new'] ?? $f['gitNew']; |
| 58 | $name = $old === $new ? $old : $old.' | '.$new; |
| 59 | $html .= "\n <h2>ファイル： ".htmlspecialchars($name)."</h2>\n"; |
| 60 | if (empty($f['rows'])) { |
| 61 | // 内容の差分が無い（バイナリ、名前の変更、モードの変更だけ等） |
| 62 | $notes = empty($f['notes']) ? ['変更なし'] : $f['notes']; |
| 63 | $html .= " <p>".htmlspecialchars(implode(' / ', $notes))."</p>\n"; |
| 64 | continue; |
| 65 | } |
| 66 | $html .= $this->generateHtml($f['rows']); |
| 67 | } |
| 68 | |
| 69 | return $html; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * 統一形式（unified diff）を解析し、ファイル毎の行のリストを返す |
| 74 | * |
| 75 | * @return array ['old', 'new', 'gitOld', 'gitNew', 'notes', 'rows'] の配列 |
| 76 | */ |
| 77 | private function parse(): array { |
| 78 | $files = []; |
| 79 | $cur = null; |
| 80 | $leftLeft = 0; // 今のハンクで残っている変更前の行数 |
| 81 | $rightLeft = 0; // 今のハンクで残っている変更後の行数 |
| 82 | $left = 0; // 次の変更前の行番号 |
| 83 | $right = 0; // 次の変更後の行番号 |
| 84 | $removed = []; |
| 85 | $added = []; |
| 86 | |
| 87 | $flush = function() use (&$cur, &$removed, &$added): void { |
| 88 | // 削除と追加の塊を左右に並べる |
| 89 | $n = max(count($removed), count($added)); |
| 90 | for ($i = 0; $i < $n; $i++) { |
| 91 | $cur['rows'][] = [ |
| 92 | 'left' => $removed[$i] ?? null, |
| 93 | 'right' => $added[$i] ?? null, |
| 94 | ]; |
| 95 | } |
| 96 | $removed = []; |
| 97 | $added = []; |
| 98 | }; |
| 99 | |
| 100 | $newFile = function(?string $gitOld, ?string $gitNew) use (&$files, &$cur, $flush): void { |
| 101 | if ($cur !== null) { |
| 102 | $flush(); |
| 103 | $files[] = $cur; |
| 104 | } |
| 105 | $cur = ['old' => null, 'new' => null, 'gitOld' => $gitOld ?? '?', 'gitNew' => $gitNew ?? '?', |
| 106 | 'notes' => [], 'rows' => []]; |
| 107 | }; |
| 108 | |
| 109 | foreach (explode("\n", $this->diffContent) as $raw) { |
| 110 | $line = rtrim($raw, "\r"); |
| 111 | |
| 112 | // ハンクの中：行数で判断する（"---" で始まる削除行をファイルヘッダーと間違えない様に） |
| 113 | if ($cur !== null && ($leftLeft > 0 || $rightLeft > 0)) { |
| 114 | $prefix = substr($line, 0, 1); |
| 115 | $content = substr($raw, 1); |
| 116 | if ($prefix === ' ' || $line === '') { |
| 117 | $flush(); |
| 118 | $cur['rows'][] = [ |
| 119 | 'left' => ['line' => $left++, 'type' => 'context', 'content' => $content], |
| 120 | 'right' => ['line' => $right++, 'type' => 'context', 'content' => $content], |
| 121 | ]; |
| 122 | $leftLeft--; |
| 123 | $rightLeft--; |
| 124 | continue; |
| 125 | } |
| 126 | if ($prefix === '-') { |
| 127 | $removed[] = ['line' => $left++, 'type' => 'removed', 'content' => $content]; |
| 128 | $leftLeft--; |
| 129 | continue; |
| 130 | } |
| 131 | if ($prefix === '+') { |
| 132 | $added[] = ['line' => $right++, 'type' => 'added', 'content' => $content]; |
| 133 | $rightLeft--; |
| 134 | continue; |
| 135 | } |
| 136 | if ($prefix === '\\') { |
| 137 | continue; // "\ No newline at end of file" |
| 138 | } |
| 139 | // 想定外の行：ハンクを終わらせて、下で普通に処理する |
| 140 | $leftLeft = 0; |
| 141 | $rightLeft = 0; |
| 142 | } |
| 143 | // ハンクの最後の行の直後の "\ No newline at end of file" |
| 144 | if (substr($line, 0, 1) === '\\') continue; |
| 145 | |
| 146 | // ファイルの始まり（git形式） |
| 147 | if (preg_match('#^diff --git a/(.+) b/(.+)$#', $line, $m)) { |
| 148 | $newFile('a/'.$m[1], 'b/'.$m[2]); |
| 149 | continue; |
| 150 | } |
| 151 | // ファイルヘッダー（git以外のdiffでは、此処がファイルの始まり） |
| 152 | if (preg_match('/^--- (.+?)(\t.*)?$/', $line, $m)) { |
| 153 | if ($cur === null || $cur['old'] !== null || !empty($cur['rows'])) $newFile(null, null); |
| 154 | $cur['old'] = $m[1]; |
| 155 | continue; |
| 156 | } |
| 157 | if (preg_match('/^\+\+\+ (.+?)(\t.*)?$/', $line, $m)) { |
| 158 | if ($cur === null) $newFile(null, null); |
| 159 | $cur['new'] = $m[1]; |
| 160 | continue; |
| 161 | } |
| 162 | if ($cur === null) continue; |
| 163 | |
| 164 | // ハンクヘッダー（例：@@ -10,6 +10,7 @@、行数が1の時は ",1" が省略される） |
| 165 | if (preg_match('/^@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@(.*)$/', $line, $m)) { |
| 166 | $flush(); |
| 167 | $left = (int)$m[1]; |
| 168 | $leftLeft = ($m[2] ?? '') === '' ? 1 : (int)$m[2]; |
| 169 | $right = (int)$m[3]; |
| 170 | $rightLeft = ($m[4] ?? '') === '' ? 1 : (int)$m[4]; |
| 171 | // 行数0のハンク（新しい・削除されたファイル）では、番号は次の行から |
| 172 | if ($leftLeft === 0) $left++; |
| 173 | if ($rightLeft === 0) $right++; |
| 174 | $cur['rows'][] = ['hunk' => trim($line)]; |
| 175 | continue; |
| 176 | } |
| 177 | |
| 178 | // 内容の無い変更の説明 |
| 179 | if (preg_match('/^Binary files (.+) and (.+) differ$/', $line, $m)) { |
| 180 | $cur['notes'][] = 'バイナリファイル'; |
| 181 | $cur['old'] = $m[1]; |
| 182 | $cur['new'] = $m[2]; |
| 183 | } elseif (preg_match('/^(new file mode|deleted file mode|old mode|new mode|similarity index|rename from|rename to|copy from|copy to) (.+)$/', $line, $m)) { |
| 184 | $labels = [ |
| 185 | 'new file mode' => '新しいファイル', 'deleted file mode' => '削除されたファイル', |
| 186 | 'old mode' => '前のモード', 'new mode' => '新しいモード', 'similarity index' => '類似度', |
| 187 | 'rename from' => '名前の変更元', 'rename to' => '名前の変更先', 'copy from' => 'コピー元', |
| 188 | 'copy to' => 'コピー先', |
| 189 | ]; |
| 190 | $cur['notes'][] = $labels[$m[1]].'：'.$m[2]; |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | if ($cur !== null) { |
| 195 | $flush(); |
| 196 | $files[] = $cur; |
| 197 | } |
| 198 | |
| 199 | return $files; |
| 200 | } |
| 201 | |
| 202 | private function generateHtml(array $rows): string { |
| 203 | $html = " <p>\n <table class=\"diff-table\">\n"; |
| 204 | $html .= " <tr class=\"diff-header\"><th colspan=\"2\">前</th><th colspan=\"2\">新</th></tr>\n"; |
| 205 | |
| 206 | foreach ($rows as $row) { |
| 207 | if (isset($row['hunk'])) { |
| 208 | $html .= " <tr class=\"hunk\">\n"; |
| 209 | $html .= " <td colspan=\"4\">".htmlspecialchars($row['hunk'])."</td>\n"; |
| 210 | $html .= " </tr>\n"; |
| 211 | continue; |
| 212 | } |
| 213 | $html .= " <tr>\n"; |
| 214 | $html .= $this->cells($row['left']); // 左（変更前） |
| 215 | $html .= $this->cells($row['right']); // 右（変更後） |
| 216 | $html .= " </tr>\n"; |
| 217 | } |
| 218 | |
| 219 | $html .= " </table>\n </p>\n"; |
| 220 | return $html; |
| 221 | } |
| 222 | |
| 223 | private function cells(?array $c): string { |
| 224 | if ($c === null) { |
| 225 | return " <td class=\"line-number\"> </td>\n <td class=\"empty\"> </td>\n"; |
| 226 | } |
| 227 | $content = rtrim($c['content'], "\r"); |
| 228 | $content = $content === '' ? ' ' : htmlspecialchars($content); |
| 229 | return " <td class=\"line-number\">{$c['line']}</td>\n" |
| 230 | . " <td class=\"{$c['type']}\">{$content}</td>\n"; |
| 231 | } |
| 232 | } |