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LittleBeast / src / Std / Lib / Markdown.php
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1<?php
2/*************************************************************
3# 076 License
4
5Copyright (c) テクニカル諏訪子
6
7Permission is hereby granted to any person obtaining a copy of the software
8Little Beast (the "Software") to use, modify, merge, copy, publish, distribute,
9sublicense, 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
31THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
32INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
33PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
34HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
35CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
36OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
37 */
38namespace Std\Lib;
39
40class Markdown {
41 private string $content;
42 private array $html;
43 private string $path;
44 private bool $inCodeBlock = false;
45 private string $codeBlockLanguage = '';
46 private array $codeBlockContent = [];
47 private const METADATA_LINE = "----";
48 private array $algebraicPlaceholder = [];
49 private array $codePlaceholder = [];
50 private array $mathErrors = [];
51 private ?Latex $latex = null;
52 private static int $tabGroupCount = 0;
53 /** fromString()の文字列（メタデータ無し） */
54 private ?string $text = null;
55
56 // コードタブのラベル / labels for code tabs
57 private const LANG_LABELS = [
58 'c' => 'C', 'cpp' => 'C++', 'cc' => 'C++', 'hpp' => 'C++', 'cs' => 'C#',
59 'slang' => 'Slang', 'glsl' => 'GLSL', 'hlsl' => 'HLSL', 'msl' => 'MSL',
60 'wgsl' => 'WGSL', 'spirv' => 'SPIR-V', 'asm' => 'Assembly', 'php' => 'PHP',
61 'js' => 'JavaScript', 'sh' => 'Shell', 'txt' => 'Text', 'json' => 'JSON',
62 'go' => 'Go', 'rust' => 'Rust', 'zig' => 'Zig', 'odin' => 'Odin', 'sql' => 'SQL',
63 ];
64
65 public function __construct(string $path, string $section, ?string $lang = null) {
66 $this->html = [];
67 if ($lang) $this->path = ROOT.$section.$lang.'/'.$path.'.md';
68 else $this->path = ROOT.$section.$path.'.md';
69
70 if (!file_exists($this->path)) {
71 header('Location: /404');
72 exit();
73 }
74 }
75
76 /**
77 * 文字列から（READMEファイル等、メタデータ無し）
78 *
79 * @param string $text Markdown
80 * @return self
81 */
82 public static function fromString(string $text): self {
83 $m = (new \ReflectionClass(self::class))->newInstanceWithoutConstructor();
84 $m->html = [];
85 $m->path = '';
86 $m->text = $text;
87 return $m;
88 }
89
90 /**
91 * メタデータを取得する
92 *
93 * @return \stdClass メタデータオブジェクト
94 */
95 public function getMetadata(): \stdClass {
96 $content = file_get_contents($this->path);
97 $metadata = new \stdClass();
98
99 $parts = explode(self::METADATA_LINE, $content, 2);
100 if (count($parts) < 2) return $metadata;
101
102 $lines = explode("\n", trim($parts[0]));
103 foreach ($lines as $line) {
104 $line = trim($line);
105 if (empty($line)) continue;
106
107 $colonPos = strpos($line, ':');
108 if ($colonPos === false) continue;
109
110 $key = trim(substr($line, 0, $colonPos));
111 $value = trim(substr($line, $colonPos + 1));
112 $value = trim($value, '"\'');
113
114 if ($key == 'category' || $key == 'css') {
115 $cat = explode(',', $value);
116 $value = $cat;
117 }
118
119 $metadata->$key = $value;
120 }
121
122 return $metadata;
123 }
124
125 /**
126 * Markdownをパースする
127 *
128 * @return string HTMLとしてレンダリングされたコンテンツ
129 */
130 public function parse(): string {
131 if ($this->text !== null) {
132 $this->content = trim(str_replace(["\r\n", "\r"], "\n", $this->text));
133 } else {
134 $content = file_get_contents($this->path);
135 $parts = explode(self::METADATA_LINE, $content, 2);
136 $this->content = count($parts) > 1 ? trim($parts[1]): trim($content);
137 }
138 $this->html = [];
139
140 $lines = self::removeComments(explode("\n", $this->content));
141 $currentParagraph = [];
142
143 $inList = false;
144 $listItems = [];
145 $listLevel = 0;
146 $inBlockquote = false;
147 $blockquoteContent = [];
148 $tableHeaders = [];
149 $tableRows = [];
150 $inTable = false;
151 $inMathBlock = false;
152 $mathLines = [];
153 $inTabs = false;
154 $tabItems = [];
155 $codeBlockLabel = '';
156 $headerCount = 1;
157 $this->mathErrors = [];
158 $i = 0;
159
160 $flush = function() use (&$currentParagraph, &$inList, &$listItems, &$listLevel,
161 &$inTable, &$tableHeaders, &$tableRows,
162 &$inBlockquote, &$blockquoteContent): void {
163 if ($inList) {
164 $this->html[] = $this->createList($listItems);
165 $listItems = [];
166 $inList = false;
167 $listLevel = 0;
168 }
169 if ($inTable) {
170 $this->html[] = $this->createTable($tableHeaders, $tableRows);
171 $tableHeaders = [];
172 $tableRows = [];
173 $inTable = false;
174 }
175 if ($inBlockquote) {
176 $this->html[] = $this->createBlockquote($blockquoteContent);
177 $blockquoteContent = [];
178 $inBlockquote = false;
179 }
180 if (!empty($currentParagraph)) {
181 $this->html[] = " <p>\n ".implode("", $currentParagraph)."\n </p>";
182 $currentParagraph = [];
183 }
184 };
185
186 foreach ($lines as $line) {
187 $i++;
188 $rawLine = rtrim($line, "\r\n");
189
190 // コードブロック（```言語 ラベル）
191 if (preg_match('/^```([\w\+\-#\.]*)(?:\s+(.*\S))?\s*$/u', $rawLine, $matches)) {
192 if (!$this->inCodeBlock) {
193 $flush();
194 $this->inCodeBlock = true;
195 $this->codeBlockLanguage = $matches[1];
196 $codeBlockLabel = $matches[2] ?? '';
197 continue;
198 } else {
199 if ($inTabs) {
200 $tabItems[] = [
201 'lang' => $this->codeBlockLanguage,
202 'label' => $codeBlockLabel,
203 'code' => $this->codeBlockContent,
204 ];
205 } else {
206 $this->html[] = $this->createCodeBlock();
207 }
208 $this->inCodeBlock = false;
209 $this->codeBlockLanguage = '';
210 $this->codeBlockContent = [];
211 $codeBlockLabel = '';
212 continue;
213 }
214 }
215
216 if ($this->inCodeBlock) {
217 $this->codeBlockContent[] = $rawLine;
218 continue;
219 }
220
221 if ($inMathBlock) {
222 if (trim($rawLine) === '$$') {
223 $this->html[] = $this->createDisplayMath(implode("\n", $mathLines));
224 $mathLines = [];
225 $inMathBlock = false;
226 } else {
227 $mathLines[] = $rawLine;
228 }
229 continue;
230 }
231
232 if (trim($rawLine) === '$$') {
233 $flush();
234 $inMathBlock = true;
235 continue;
236 }
237
238 // 1行の数式ブロック：$$…$$だけの行 / a line holding only $$…$$ is display math
239 if (preg_match('/^\s*\$\$(.+)\$\$\s*$/u', $rawLine, $matches)
240 && substr_count($rawLine, '$$') === 2) {
241 $flush();
242 $this->html[] = $this->createDisplayMath($matches[1]);
243 continue;
244 }
245
246 // コードタブ（:::tabs … :::） / code tabs
247 if (preg_match('/^:::\s*tabs\s*$/', trim($rawLine))) {
248 $flush();
249 $inTabs = true;
250 $tabItems = [];
251 continue;
252 }
253
254 if ($inTabs) {
255 if (trim($rawLine) === ':::') {
256 $this->html[] = $this->createTabs($tabItems);
257 $tabItems = [];
258 $inTabs = false;
259 }
260 continue; // タブの中ではコードブロック以外は無視 / only code blocks inside tabs
261 }
262
263 $hasBR = str_ends_with($rawLine, '\\');
264 $line = rtrim($rawLine, "\\");
265
266 // テーブルの処理
267 if (preg_match('/^\|(.+)\|$/', $line)) {
268 if (!empty($currentParagraph)) {
269 $this->html[] = " <p>\n ".implode("", $currentParagraph)."\n </p>";
270 $currentParagraph = [];
271 }
272 $cells = array_map('trim', explode('|', trim($line, '|')));
273
274 if (!$inTable) {
275 $tableHeaders = $cells;
276 $inTable = true;
277 } elseif (preg_match('/^\|(\s*:?-+:?\s*\|)+$/', $line)) {
278 continue;
279 } else {
280 $tableRows[] = $cells;
281 }
282 continue;
283 } elseif ($inTable) {
284 $this->html[] = $this->createTable($tableHeaders, $tableRows);
285 $tableHeaders = [];
286 $tableRows = [];
287 $inTable = false;
288 }
289
290 // 水平線の処理
291 if (preg_match('/^([\-\*\_])\1{2,}$/', $line)) {
292 if (!empty($currentParagraph)) {
293 $this->html[] = " <p>\n ".implode("", $currentParagraph)."\n </p>";
294 $currentParagraph = [];
295 }
296 $this->html[] = " <hr />\n";
297 continue;
298 }
299
300 // 引用ブロックの処理
301 if (preg_match('/^>\s(.+)/', $line, $matches)) {
302 if (!empty($currentParagraph)) {
303 $this->html[] = " <p>\n ".implode("", $currentParagraph)."\n </p>";
304 $currentParagraph = [];
305 }
306 $inBlockquote = true;
307 $blockquoteContent[] = $this->parseInline($matches[1]);
308 continue;
309 } elseif ($inBlockquote && empty($line)) {
310 $this->html[] = $this->createBlockquote($blockquoteContent);
311 $blockquoteContent = [];
312 $inBlockquote = false;
313 continue;
314 }
315
316 // 空行をスキップ
317 if (empty($line)) {
318 if ($inList) {
319 $this->html[] = $this->createList($listItems);
320 $listItems = [];
321 $inList = false;
322 }
323 if (!empty($currentParagraph)) {
324 $this->html[] = " <p>\n ".implode("", $currentParagraph)."\n </p>";
325 $currentParagraph = [];
326 }
327
328 continue;
329 }
330
331 // ヘッダー
332 if (preg_match('/^(#{1,6})\s(.+)/', $line, $m)) {
333 if ($inList) {
334 $this->html[] = $this->createList($listItems);
335 $listItems = [];
336 $inList = false;
337 }
338 if (!empty($currentParagraph)) {
339 $this->html[] = " <p>\n ".implode("", $currentParagraph)."\n </p>";
340 $currentParagraph = [];
341 }
342
343 $level = strlen($m[1]);
344 $this->html[] = " <h{$level} id=\"section-{$headerCount}\">".$this->parseInline($m[2])."</h{$level}>";
345 $headerCount++;
346 continue;
347 }
348
349 // 箇条書きリスト
350 if (preg_match('/^(\s*)([\*\-])\s(.+)/', $line, $m)) {
351 if (!empty($currentParagraph)) {
352 $this->html[] = " <p>\n ".implode("", $currentParagraph)."\n </p>";
353 $currentParagraph = [];
354 }
355 $inList = true;
356 $currentLevel = strlen($m[1]) / 2;
357 $listLevel = max($listLevel, $currentLevel);
358 $listItems[] = [
359 'content' => $this->parseInline($m[3]),
360 'level' => $currentLevel,
361 'type' => 'ul',
362 ];
363
364 continue;
365 }
366
367 // 番号付きリスト
368 if (preg_match('/^(\s*)\d+\.\s(.+)/', $line, $m)) {
369 if (!empty($currentParagraph)) {
370 $this->html[] = " <p>\n ".implode("", $currentParagraph)."\n </p>";
371 $currentParagraph = [];
372 }
373 $inList = true;
374 $currentLevel = strlen($m[1]) / 2;
375 $listLevel = max($listLevel, $currentLevel);
376 $listItems[] = [
377 'content' => $this->parseInline($m[2]),
378 'level' => $currentLevel,
379 'type' => 'ol',
380 ];
381
382 continue;
383 }
384
385 if ($inList) {
386 $this->html[] = $this->createList($listItems);
387 $listItems = [];
388 $inList = false;
389 $listLevel = 0;
390 }
391
392 $parsedLine = $this->parseInline($line);
393 $currentParagraph[] = $parsedLine;
394 if ($hasBR) {
395 $currentParagraph[] = "<br />\n ";
396 }
397 }
398
399 if ($this->inCodeBlock) {
400 $this->html[] = $this->createCodeBlock();
401 $this->inCodeBlock = false;
402 $this->codeBlockContent = [];
403 }
404 if ($inMathBlock) $this->html[] = $this->createDisplayMath(implode("\n", $mathLines));
405 if ($inTabs) $this->html[] = $this->createTabs($tabItems);
406 $flush();
407
408 return implode("\n", $this->html);
409 }
410
411 /**
412 * コメントを取り除く（parse()の前処理。プレビューや検索にも使う）
413 *
414 * 「//」で始まる行と、「/*」で始まる行から「*／」までは無い物として扱う。
415 * 「*／」の後に文字があれば、その部分は残す。閉じられていない「/*」は最後までコメント。
416 * コードブロックの中はそのまま。
417 *
418 * @param array $lines 行の配列
419 * @return array コメントを取り除いた行の配列
420 */
421 public static function removeComments(array $lines): array {
422 $out = [];
423 $inCode = false;
424 $inComment = false;
425
426 foreach ($lines as $line) {
427 $raw = rtrim($line, "\r\n");
428
429 if (!$inComment && preg_match('/^```([\w\+\-#\.]*)(?:\s+(.*\S))?\s*$/u', $raw)) {
430 $inCode = !$inCode;
431 $out[] = $line;
432 continue;
433 }
434 if ($inCode) {
435 $out[] = $line;
436 continue;
437 }
438
439 // 1行に「/* … */ /* … */ 本文」の様に続く場合もあるので、繰り返す
440 $rest = $raw;
441 while (true) {
442 if ($inComment) {
443 $end = strpos($rest, '*/');
444 if ($end === false) {
445 $rest = null;
446 break;
447 }
448 $inComment = false;
449 $rest = ltrim(substr($rest, $end + 2));
450 if ($rest === '') {
451 $rest = null;
452 break;
453 }
454 continue;
455 }
456
457 $trimmed = ltrim($rest);
458 if (str_starts_with($trimmed, '//')) {
459 $rest = null;
460 } else if (str_starts_with($trimmed, '/*')) {
461 $inComment = true;
462 $rest = substr($trimmed, 2);
463 continue;
464 }
465 break;
466 }
467
468 if ($rest !== null) $out[] = $rest === $raw ? $line : $rest;
469 }
470
471 return $out;
472 }
473
474 /**
475 * テキストからコメントを取り除く（removeComments()の文字列版）
476 *
477 * @param string $text Markdownのテキスト
478 * @return string
479 */
480 public static function stripComments(string $text): string {
481 return implode("\n", self::removeComments(explode("\n", str_replace("\r\n", "\n", $text))));
482 }
483
484 /**
485 * 直前のparse()で見つかった、変換出来なかったLaTeXコマンド
486 *
487 * @return array エラーの配列
488 */
489 public function getMathErrors(): array {
490 return $this->mathErrors;
491 }
492
493 // 機能性メソッド
494
495 /**
496 * インラインのMarkdown記法をパースする
497 *
498 * @param string $text パースするテキスト
499 * @return string HTMLとしてレンダリングされたテキスト
500 */
501 private function parseInline(string $text): string {
502 $this->algebraicPlaceholder = [];
503 $this->codePlaceholder = [];
504 $text = htmlspecialchars($text, ENT_QUOTES, 'UTF-8');
505
506 // インラインコードは他の記法より先に保護する（中の*や_や\をそのまま表示する為）
507 $text = preg_replace_callback('/(?<!\\\\)`(.+?)`/u', function($matches): string {
508 $placeholder = "{{CODE".count($this->codePlaceholder).'CODE}}';
509 // 記号の前の\だけをエスケープとして消す（`json\_encode`や`C:\\`の為）。\nや\0はそのまま。
510 $code = preg_replace('/\\\\([\\\\`*_~$%^!\[\]()#{}|.+\-])/u', '$1', $matches[1]);
511 $this->codePlaceholder[$placeholder] = '<code>'.$code.'</code>';
512 return $placeholder;
513 }, $text);
514
515 $patterns = [
516 // 数式
517 '/(?<!\\\\)\$\$([^$]+)\$\$/u' => function($matches): string {
518 $placeholder = "{{ALG".count($this->algebraicPlaceholder).'ALG}}';
519 $this->algebraicPlaceholder[$placeholder] = $matches[1];
520 return $placeholder;
521 },
522 // 太字
523 '/(?<!\\\\)\*\*(.+?)\*\*/u' => '<strong>$1</strong>',
524 // 斜体
525 '/(?<!\\\\)\*(.+?)\*/u' => '<em>$1</em>',
526 // 下線
527 '/(?<!\\\\)_(.+?)_/u' => '<u>$1</u>',
528 // 取り消し線
529 '/(?<!\\\\)~(.+?)~/u' => '<s>$1</s>',
530 // Blink (with speed)
531 '/(?<!\\\\)!:\((.+?)\)(.+?):!/u' => '<span class="blink" style="animation-duration: $1s;">$2</span>',
532 // Blink
533 '/(?<!\\\\)!:(.+?):!/u' => '<span class="blink">$1</span>',
534 // フォントの大きさ
535 '/(?<!\\\\)\^\((.+?)\)(.+?)\^/u' => '<span style="font-size: $1px;">$2</span>',
536 // フォントカラー
537 '/(?<!\\\\)\%\((.+?)\)(.+?)\%/u' => '<span style="color: #$1;">$2</span>',
538 // 画像
539 '/(?<!\\\\)\!\[(.*?)(?:#([^\]]*))?\]\((.+?)\)/u' => '<img style="width: 100%; $2" src="$3" alt="$1" />',
540 // 音楽
541 '/(?<!\\\\)\$\[([^\]]+)\]\(([^\)]+)\)/u' => '<audio controls><source src="$2" type="$1" /></audio>',
542 // 動画
543 '/(?<!\\\\)\#\[([^\]]+)\]\(([^\)]+)\)/u' => '<video style="max-width: 100%;" controls><source src="$2" type="$1" /></video>',
544 // リンク
545 '/(?<!\\\\)\[(.+?)\]\((.+?)\)/u' => '<a href="$2">$1</a>',
546 // 振り仮名
547 '/(?<!\\\\)&lt;(.+?)&gt;\((.+?)\)/u' => '<ruby>$1<rp>(</rp><rt>$2</rt><rp>)</rp></ruby>',
548 ];
549
550 foreach ($patterns as $pattern => $replacement) {
551 if (is_callable($replacement)) {
552 $text = preg_replace_callback($pattern, $replacement, $text);
553 } else {
554 // kys([$pattern, $replacement, $text]);
555 $result = preg_replace($pattern, $replacement, $text);
556 // kys($result);
557 if ($result === null) continue;
558 // kys($text);
559 $text = $result;
560 }
561 }
562
563 // エスケープ文字の\を消す（数式とコードを戻す前に）
564 $text = preg_replace('/\\\\(.)/u', '$1', $text);
565
566 // プレースホルダーを数式とコードに交換
567 foreach ($this->algebraicPlaceholder as $placeholder => $expr) {
568 $text = str_replace($placeholder, $this->parseAlgebraic($expr), $text);
569 }
570
571 foreach ($this->codePlaceholder as $placeholder => $code) {
572 $text = str_replace($placeholder, $code, $text);
573 }
574
575 return $text;
576 }
577
578 /**
579 * 数式記法をパースする
580 *
581 * @param string $expression パースする数式
582 * @param bool $display ブロック表示ならtrue
583 * @return string MathMLとしてレンダリングされた数式
584 */
585 private function parseAlgebraic(string $expression, bool $display = false): string {
586 // HTMLエスケープを戻す（Latexクラスが自分でエスケープする）
587 $expression = htmlspecialchars_decode($expression, ENT_QUOTES);
588
589 if ($this->latex === null) $this->latex = new Latex();
590 $mathml = $this->latex->render($expression, $display);
591 foreach ($this->latex->getErrors() as $err) $this->mathErrors[] = $err;
592
593 return $mathml;
594 }
595
596 /**
597 * ブロック表示の数式を作成する
598 *
599 * @param string $expression LaTeXの数式
600 * @return string HTMLの数式ブロック
601 */
602 private function createDisplayMath(string $expression): string {
603 return " <div class=\"math-display\">".$this->parseAlgebraic($expression, true)."</div>";
604 }
605
606 /**
607 * コードタブを作成する（JavaScript無し、ラジオボタンとCSSだけ）
608 *
609 * @param array $items ['lang' => 言語, 'label' => ラベル, 'code' => 行の配列]の配列
610 * @return string HTMLのタブ
611 */
612 private function createTabs(array $items): string {
613 if (empty($items)) return '';
614
615 $group = 'code-tabs-'.(++self::$tabGroupCount);
616 $inputs = '';
617 $panels = '';
618
619 foreach ($items as $n => $item) {
620 $id = "{$group}-{$n}";
621 $label = $item['label'] !== '' ? $item['label']
622 : (self::LANG_LABELS[strtolower($item['lang'])] ?? ($item['lang'] !== '' ? $item['lang'] : 'Code'));
623 $checked = $n === 0 ? ' checked="checked"' : '';
624 [$code, $class] = $this->renderCode(implode("\n", $item['code']), $item['lang']);
625
626 $inputs .= " <input type=\"radio\" name=\"{$group}\" id=\"{$id}\"{$checked} />\n";
627 $inputs .= " <label for=\"{$id}\">".htmlspecialchars($label)."</label>\n";
628 $panels .= " <div class=\"code-tab-panel\"><pre><code{$class}>{$code}</code></pre></div>\n";
629 }
630
631 return " <div class=\"code-tabs\">\n{$inputs}{$panels} </div>";
632 }
633
634 /**
635 * リストを作成する
636 *
637 * @param array $items リストアイテムの配列
638 * @param int $maxLevel 最大ネストレベル
639 * @return string HTMLのリスト
640 */
641 private function createList(array $items, int $maxLevel = 1): string {
642 if ($items === []) return '';
643
644 $html = '';
645 $currentLevel = 0;
646 $listStack = [];
647 $currentType = '';
648
649 foreach ($items as $item) {
650 $level = isset($item['level']) ? $item['level'] : $currentLevel;
651
652 // ネストから戻る時はレベルを下げる（下げないと無限ループになる）
653 while ($currentLevel > $level) {
654 $html .= str_repeat(' ', $currentLevel)."</".array_pop($listStack).">\n";
655 $currentLevel--;
656 }
657
658 while ($currentLevel < $level) {
659 $currentLevel++;
660 $listStack[] = $item['type'];
661 $html .= str_repeat(' ', $currentLevel - 1)."<".$item['type'].">\n";
662 }
663
664 if ($currentType != $item['type'] && $currentLevel == $item['level']) {
665 if (!empty($listStack)) {
666 $html .= str_repeat(' ', $currentLevel)."</".array_pop($listStack).">\n";
667 $listStack[] = $item['type'];
668 $html .= str_repeat(' ', $currentLevel - 1)."<".$item['type'].">\n";
669 }
670 }
671
672 $currentType = $item['type'];
673 }
674
675 $html .= " <p>\n <{$currentType}>\n";
676 foreach ($items as $item) {
677 $html .= str_repeat(' ', $currentLevel)." <li>".$item['content']."</li>\n";
678 }
679 $html .= " </{$currentType}>\n </p>";
680
681 while (!empty($listStack)) {
682 $html .= str_repeat(' ', $currentLevel)."</".array_pop($listStack).">\n";
683 $currentLevel--;
684 }
685
686 return rtrim($html);
687 }
688
689 /**
690 * コードブロックを作成する
691 *
692 * @return string HTMLのコードブロック
693 */
694 private function createCodeBlock(): string {
695 [$code, $class] = $this->renderCode(implode("\n", $this->codeBlockContent), $this->codeBlockLanguage);
696 return " <p>\n <pre><code{$class}>{$code}</code></pre>";
697 }
698
699 /**
700 * コードをHTMLにする（対応している言語はシンタックスハイライトする）
701 *
702 * @param string $raw 生のコード
703 * @param string $lang 言語名（```の後）
704 * @return array [エスケープ済みのコード, class属性]
705 */
706 private function renderCode(string $raw, string $lang): array {
707 $lang = strtolower($lang);
708 $attr = htmlspecialchars($lang, ENT_QUOTES, 'UTF-8');
709
710 // Syntax::colorize()はエスケープ済みのHTMLを返す
711 if ($lang !== '' && Syntax::isSupported($lang)) {
712 return [(new Syntax($lang))->colorize($raw), " class=\"language-{$attr} hl\""];
713 }
714
715 return [htmlspecialchars($raw), $lang !== '' ? " class=\"language-{$attr}\"" : ''];
716 }
717
718 private function createBlockquote(array $content): string {
719 return " <p>\n <blockquote>\n ".implode("<br />\n ", $content)."\n </blockquote>\n </p>";
720 }
721
722 /**
723 * テーブルを作成する
724 *
725 * @param array $headers ヘッダー配列
726 * @param array $rows 行データの配列
727 * @return string HTMLのテーブル
728 */
729 private function createTable(array $headers, array $rows): string {
730 $html = " <p>\n <table>\n";
731
732 // ヘッダーを追加
733 if (!empty($headers)) {
734 $html .= " <thead>\n <tr>\n";
735 foreach ($headers as $header) {
736 $html .= " <th>".$this->parseInline($header)."</th>\n";
737 }
738 $html .= " </tr>\n </thead>\n";
739 }
740
741 // 行を追加
742 if (!empty($rows)) {
743 $html .= " <tbody>\n";
744 foreach ($rows as $row) {
745 $html .= " <tr>\n";
746 foreach ($row as $cell) {
747 $html .= " <td>".$this->parseInline($cell)."</td>\n";
748 }
749 $html .= " </tr>\n";
750 }
751 $html .= " </tbody>\n";
752 }
753
754 $html .= " </table>\n </p>";
755 return $html;
756 }
757}