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Basic markdown support added

master
Rocketsoup 3 jaren geleden
bovenliggende
522c793825
commit
076477343b
1 gewijzigde bestanden met toevoegingen van 200 en 1 verwijderingen
Gecombineerde weergave Toon Diff Stats
  1. 200
    1
      htdocs/index.php

+ 200
- 1
htdocs/index.php Bestand weergeven

890 
 	}
 890 
 	}
891
891
892 
 	public static function render_post(Post $post): void {
 892 
 	public static function render_post(Post $post): void {
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-		$body_html = self::post_body_html($post->body);
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+		$body_html = Markdown::markdown_to_html($post->body);
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 		$date = localized_date_string($post->created);
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 		$date = localized_date_string($post->created);
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 		print(<<<HTML
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 		print(<<<HTML
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 			<div class="post">
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 			<div class="post">
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 	}
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 	}
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 }
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 }
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+class HTMLBlock {
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+	public HTMLBlockType $type;
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+	public int $indent;
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+	public string $content_markdown;
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+
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+	function __construct(HTMLBlockType $type, int $indent, string $content_markdown) {
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+		$this->type = $type;
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+		$this->indent = $indent;
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+		$this->content_markdown = $content_markdown;
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+	}
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+}
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+
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+enum HTMLBlockType {
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+	case Plain;
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+	case ListItem;
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+	case BlockQuote;
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+	case Preformatted;
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+	case H1;
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+	case H2;
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+	case H3;
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+	case H4;
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+	case H5;
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+	case H6;
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+}
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+
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+class Markdown {
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+	/// Converts one line of markdown to HTML.
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+	/// @param string $markdown  Markdown string
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+	/// @return string  HTML
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+	public static function line_markdown_to_html(string $markdown): string {
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+		$html = htmlentities($markdown);
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+		// Explicit URL [label](URL)
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+		$html = preg_replace('|\[(.*?)\]\((.*?)\)|',
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+			'<a referrerpolicy="no-referrer" target="_new" href="$2">$1</a>', $html);
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+		// Implicit URL
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+		$html = preg_replace('|(?<!href=")(http(?:s)?://)(\S+[^\s\.,\?!:;"\'\)])|',
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+			'<a referrerpolicy="no-referrer" target="_new" href="$1$2">$2</a>', $html);
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+		// Italic
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+		$html = preg_replace('/__(\S|\S.*?)__/', '<em>$1</em>', $html);
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+		// Bold
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+		$html = preg_replace('/\*\*(\S|\S.*?\S)\*\*/', '<strong>$1</strong>', $html);
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+		// Strikethrough
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+		$html = preg_replace('/~~(\S|\S.*?\S)~~/', '<strike>$1</strike>', $html);
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+		// Code
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+		$html = preg_replace('/`(\S|\S.*?\S)`/', '<code>$1</code>', $html);
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+		return $html;
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+	}
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+
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+	/// Converts markdown into an array of HTMLBlocks.
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+	/// @param string $markdown  Markdown string
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+	/// @return array  Array of HTMLBlocks
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+	private static function markdown_to_blocks(string $markdown): array {
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+		$prefix_to_linetype = array(
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+			'*' => HTMLBlockType::ListItem,
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+			'-' => HTMLBlockType::ListItem,
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+			'+' => HTMLBlockType::ListItem,
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+			'>' => HTMLBlockType::BlockQuote,
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+			'######' => HTMLBlockType::H6,
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+			'#####' => HTMLBlockType::H5,
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+			'####' => HTMLBlockType::H4,
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+			'###' => HTMLBlockType::H3,
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+			'##' => HTMLBlockType::H2,
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+			'#' => HTMLBlockType::H1,
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+		);
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+		$blocks = array();
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+		foreach (explode("\n", $markdown) as $line) {
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+			$trimmed_line = trim($line);
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+			$indent = intval(round((strlen($line) - strlen($trimmed_line)) / 4));
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+			$block_type = HTMLBlockType::Plain;
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+			$block_content = $trimmed_line;
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+			foreach ($prefix_to_linetype as $prefix => $type) {
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+				if ($trimmed_line == $prefix ||
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+					str_starts_with($trimmed_line, $prefix . ' ')) {
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+					$block_content = substr($trimmed_line, strlen($prefix));
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+					$block_type = $type;
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+					break;
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+				}
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+			}
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+			$blocks[] = new HTMLBlock($block_type, $indent, $block_content);
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+		}
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+		return $blocks;
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+	}
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+
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+	/// Converts markdown to HTML
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+	public static function markdown_to_html(string $markdown): string {
1088 
+		return self::blocks_to_html(self::markdown_to_blocks($markdown));
1089 
+	}
1090 
+
1091 
+	/// Converts an array of HTMLBlocks to HTML.
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+	private static function blocks_to_html(array $blocks): string {
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+		$html = '';
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+		$last_block = null;
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+		$tag_stack = array(); // stack of end tag strings for current open blocks
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+		foreach ($blocks as $block) {
1097 
+			$is_empty = strlen($block->content_markdown) == 0;
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+			$is_last_empty = strlen($last_block?->content_markdown ?? '') == 0;
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+			$is_same_block = $block->type == $last_block?->type;
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+			if (!$is_same_block && sizeof($tag_stack) > 0) {
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+				foreach (array_reverse($tag_stack) as $tag) {
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+					$html .= $tag;
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+				}
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+				$tag_stack = array();
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+			}
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+			switch ($block->type) {
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+				case HTMLBlockType::Plain:
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+					if ($is_empty) {
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+						if ($is_last_empty) {
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+							// ignore two consecutive empty lines
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+						} else {
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+							$html .= array_pop($tag_stack);
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+						}
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+					} elseif ($is_last_empty) {
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+						$html .= "<p>" . self::line_markdown_to_html($block->content_markdown);
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+						$tag_stack[] = "</p>\n\n";
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+					} else {
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+						$html .= "<br/>\n" . self::line_markdown_to_html($block->content_markdown);
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+					}
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+					break;
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+				case HTMLBlockType::ListItem:
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+					if (!$is_same_block) {
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+						foreach (array_reverse($tag_stack) as $tag) {
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+							$html .= $tag;
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+						}
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+						$tag_stack = array();
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+						for ($i = 0; $i <= $block->indent; $i++) {
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+							$html .= "<ul>\n";
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+							$html .= "<li>";
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+							$tag_stack[] = "</ul>\n";
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+							$tag_stack[] = "</li>\n";
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+						}
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+						$html .= self::line_markdown_to_html($block->content_markdown);
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+					} elseif ($block->indent == $last_block->indent) {
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+						$html .= "</li>\n";
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+						$html .= "<li>" . self::line_markdown_to_html($block->content_markdown);
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+					} elseif ($block->indent > $last_block->indent) {
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+						// Deeper indent level
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+						for ($i = $last_block->indent; $i < $block->indent; $i++) {
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+							$html .= "<ul>\n<li>" . self::line_markdown_to_html($block->content_markdown);
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+							$tag_stack[] = "</ul>\n";
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+							$tag_stack[] = "</li>\n";
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+						}
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+					} elseif ($block->indent < $last_block->indent) {
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+						// Shallower indent level
1146 
+						for ($i = $block->indent; $i < $last_block->indent; $i++) {
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+							$html .= array_pop($tag_stack);
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+							$html .= array_pop($tag_stack);
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+						}
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+						$html .= "</li>\n";
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+						$html .= "<li>" . self::line_markdown_to_html($block->content_markdown);
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+					}
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+					break;
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+				case HTMLBlockType::BlockQuote:
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+					if ($is_same_block) {
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+						$html .= "<br/>\n";
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+					} else {
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+						$html .= "<blockquote>";
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+						$tag_stack[] = "</blockquote>\n\n";
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+					}
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+					$html .= self::line_markdown_to_html($block->content_markdown);
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+					break;
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+				case HTMLBlockType::Preformatted:
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+					if ($is_same_block) {
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+						$html .= "\n";
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+					} else {
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+						$html .= "<pre>";
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+						$tag_stack[] = "</pre>\n\n";
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+					}
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+					$html .= htmlentities($block->content_markdown);
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+					break;
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+				case HTMLBlockType::H1:
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+					$html .= '<h1>' . self::line_markdown_to_html($block->content_markdown) . "</h1>\n\n";
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+					break;
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+				case HTMLBlockType::H2:
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+					$html .= '<h2>' . self::line_markdown_to_html($block->content_markdown) . "</h2>\n\n";
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+					break;
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+				case HTMLBlockType::H3:
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+					$html .= '<h3>' . self::line_markdown_to_html($block->content_markdown) . "</h3>\n\n";
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+					break;
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+				case HTMLBlockType::H4:
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+					$html .= '<h4>' . self::line_markdown_to_html($block->content_markdown) . "</h4>\n\n";
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+					break;
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+				case HTMLBlockType::H5:
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+					$html .= '<h5>' . self::line_markdown_to_html($block->content_markdown) . "</h5>\n\n";
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+					break;
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+				case HTMLBlockType::H6:
1188 
+					$html .= '<h6>' . self::line_markdown_to_html($block->content_markdown) . "</h6>\n\n";
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+					break;
1190 
+			}
1191 
+			$last_block = $block;
1192 
+		}
1193 
+		if (sizeof($tag_stack) > 0) {
1194 
+			foreach (array_reverse($tag_stack) as $tag) {
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+				$html .= $tag;
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+			}
1197 
+		}
1198 
+		return $html;
1199 
+	}
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+}
1201 
+
1003 
 // -- Main logic ------------------------------------------
 1202 
 // -- Main logic ------------------------------------------
1004
1203
1005 
 check_setup();
 1204 
 check_setup();

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