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Basic markdown support added

master
Rocketsoup 3 年前
父节点
522c793825
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076477343b
共有 1 个文件被更改，包括 200 次插入 和 1 次删除
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  1. 200
    1
      htdocs/index.php

+ 200
- 1
htdocs/index.php 查看文件 

@@ -890,7 +890,7 @@ class HTMLPage {
890 890 
 	}
891 891
892 892 
 	public static function render_post(Post $post): void {
893 
-		$body_html = self::post_body_html($post->body);
893 
+		$body_html = Markdown::markdown_to_html($post->body);
894 894 
 		$date = localized_date_string($post->created);
895 895 
 		print(<<<HTML
896 896 
 			<div class="post">
 
@@ -1000,6 +1000,205 @@ class HTMLPage {
1000 1000 
 	}
1001 1001 
 }
1002 1002
1003 
+class HTMLBlock {
1004 
+	public HTMLBlockType $type;
1005 
+	public int $indent;
1006 
+	public string $content_markdown;
1007 
+
1008 
+	function __construct(HTMLBlockType $type, int $indent, string $content_markdown) {
1009 
+		$this->type = $type;
1010 
+		$this->indent = $indent;
1011 
+		$this->content_markdown = $content_markdown;
1012 
+	}
1013 
+}
1014 
+
1015 
+enum HTMLBlockType {
1016 
+	case Plain;
1017 
+	case ListItem;
1018 
+	case BlockQuote;
1019 
+	case Preformatted;
1020 
+	case H1;
1021 
+	case H2;
1022 
+	case H3;
1023 
+	case H4;
1024 
+	case H5;
1025 
+	case H6;
1026 
+}
1027 
+
1028 
+class Markdown {
1029 
+	/// Converts one line of markdown to HTML.
1030 
+	/// @param string $markdown  Markdown string
1031 
+	/// @return string  HTML
1032 
+	public static function line_markdown_to_html(string $markdown): string {
1033 
+		$html = htmlentities($markdown);
1034 
+		// Explicit URL [label](URL)
1035 
+		$html = preg_replace('|\[(.*?)\]\((.*?)\)|',
1036 
+			'<a referrerpolicy="no-referrer" target="_new" href="$2">$1</a>', $html);
1037 
+		// Implicit URL
1038 
+		$html = preg_replace('|(?<!href=")(http(?:s)?://)(\S+[^\s\.,\?!:;"\'\)])|',
1039 
+			'<a referrerpolicy="no-referrer" target="_new" href="$1$2">$2</a>', $html);
1040 
+		// Italic
1041 
+		$html = preg_replace('/__(\S|\S.*?)__/', '<em>$1</em>', $html);
1042 
+		// Bold
1043 
+		$html = preg_replace('/\*\*(\S|\S.*?\S)\*\*/', '<strong>$1</strong>', $html);
1044 
+		// Strikethrough
1045 
+		$html = preg_replace('/~~(\S|\S.*?\S)~~/', '<strike>$1</strike>', $html);
1046 
+		// Code
1047 
+		$html = preg_replace('/`(\S|\S.*?\S)`/', '<code>$1</code>', $html);
1048 
+		return $html;
1049 
+	}
1050 
+
1051 
+	/// Converts markdown into an array of HTMLBlocks.
1052 
+	/// @param string $markdown  Markdown string
1053 
+	/// @return array  Array of HTMLBlocks
1054 
+	private static function markdown_to_blocks(string $markdown): array {
1055 
+		$prefix_to_linetype = array(
1056 
+			'*' => HTMLBlockType::ListItem,
1057 
+			'-' => HTMLBlockType::ListItem,
1058 
+			'+' => HTMLBlockType::ListItem,
1059 
+			'>' => HTMLBlockType::BlockQuote,
1060 
+			'######' => HTMLBlockType::H6,
1061 
+			'#####' => HTMLBlockType::H5,
1062 
+			'####' => HTMLBlockType::H4,
1063 
+			'###' => HTMLBlockType::H3,
1064 
+			'##' => HTMLBlockType::H2,
1065 
+			'#' => HTMLBlockType::H1,
1066 
+		);
1067 
+		$blocks = array();
1068 
+		foreach (explode("\n", $markdown) as $line) {
1069 
+			$trimmed_line = trim($line);
1070 
+			$indent = intval(round((strlen($line) - strlen($trimmed_line)) / 4));
1071 
+			$block_type = HTMLBlockType::Plain;
1072 
+			$block_content = $trimmed_line;
1073 
+			foreach ($prefix_to_linetype as $prefix => $type) {
1074 
+				if ($trimmed_line == $prefix ||
1075 
+					str_starts_with($trimmed_line, $prefix . ' ')) {
1076 
+					$block_content = substr($trimmed_line, strlen($prefix));
1077 
+					$block_type = $type;
1078 
+					break;
1079 
+				}
1080 
+			}
1081 
+			$blocks[] = new HTMLBlock($block_type, $indent, $block_content);
1082 
+		}
1083 
+		return $blocks;
1084 
+	}
1085 
+
1086 
+	/// Converts markdown to HTML
1087 
+	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.
1092 
+	private static function blocks_to_html(array $blocks): string {
1093 
+		$html = '';
1094 
+		$last_block = null;
1095 
+		$tag_stack = array(); // stack of end tag strings for current open blocks
1096 
+		foreach ($blocks as $block) {
1097 
+			$is_empty = strlen($block->content_markdown) == 0;
1098 
+			$is_last_empty = strlen($last_block?->content_markdown ?? '') == 0;
1099 
+			$is_same_block = $block->type == $last_block?->type;
1100 
+			if (!$is_same_block && sizeof($tag_stack) > 0) {
1101 
+				foreach (array_reverse($tag_stack) as $tag) {
1102 
+					$html .= $tag;
1103 
+				}
1104 
+				$tag_stack = array();
1105 
+			}
1106 
+			switch ($block->type) {
1107 
+				case HTMLBlockType::Plain:
1108 
+					if ($is_empty) {
1109 
+						if ($is_last_empty) {
1110 
+							// ignore two consecutive empty lines
1111 
+						} else {
1112 
+							$html .= array_pop($tag_stack);
1113 
+						}
1114 
+					} elseif ($is_last_empty) {
1115 
+						$html .= "<p>" . self::line_markdown_to_html($block->content_markdown);
1116 
+						$tag_stack[] = "</p>\n\n";
1117 
+					} else {
1118 
+						$html .= "<br/>\n" . self::line_markdown_to_html($block->content_markdown);
1119 
+					}
1120 
+					break;
1121 
+				case HTMLBlockType::ListItem:
1122 
+					if (!$is_same_block) {
1123 
+						foreach (array_reverse($tag_stack) as $tag) {
1124 
+							$html .= $tag;
1125 
+						}
1126 
+						$tag_stack = array();
1127 
+						for ($i = 0; $i <= $block->indent; $i++) {
1128 
+							$html .= "<ul>\n";
1129 
+							$html .= "<li>";
1130 
+							$tag_stack[] = "</ul>\n";
1131 
+							$tag_stack[] = "</li>\n";
1132 
+						}
1133 
+						$html .= self::line_markdown_to_html($block->content_markdown);
1134 
+					} elseif ($block->indent == $last_block->indent) {
1135 
+						$html .= "</li>\n";
1136 
+						$html .= "<li>" . self::line_markdown_to_html($block->content_markdown);
1137 
+					} elseif ($block->indent > $last_block->indent) {
1138 
+						// Deeper indent level
1139 
+						for ($i = $last_block->indent; $i < $block->indent; $i++) {
1140 
+							$html .= "<ul>\n<li>" . self::line_markdown_to_html($block->content_markdown);
1141 
+							$tag_stack[] = "</ul>\n";
1142 
+							$tag_stack[] = "</li>\n";
1143 
+						}
1144 
+					} elseif ($block->indent < $last_block->indent) {
1145 
+						// Shallower indent level
1146 
+						for ($i = $block->indent; $i < $last_block->indent; $i++) {
1147 
+							$html .= array_pop($tag_stack);
1148 
+							$html .= array_pop($tag_stack);
1149 
+						}
1150 
+						$html .= "</li>\n";
1151 
+						$html .= "<li>" . self::line_markdown_to_html($block->content_markdown);
1152 
+					}
1153 
+					break;
1154 
+				case HTMLBlockType::BlockQuote:
1155 
+					if ($is_same_block) {
1156 
+						$html .= "<br/>\n";
1157 
+					} else {
1158 
+						$html .= "<blockquote>";
1159 
+						$tag_stack[] = "</blockquote>\n\n";
1160 
+					}
1161 
+					$html .= self::line_markdown_to_html($block->content_markdown);
1162 
+					break;
1163 
+				case HTMLBlockType::Preformatted:
1164 
+					if ($is_same_block) {
1165 
+						$html .= "\n";
1166 
+					} else {
1167 
+						$html .= "<pre>";
1168 
+						$tag_stack[] = "</pre>\n\n";
1169 
+					}
1170 
+					$html .= htmlentities($block->content_markdown);
1171 
+					break;
1172 
+				case HTMLBlockType::H1:
1173 
+					$html .= '<h1>' . self::line_markdown_to_html($block->content_markdown) . "</h1>\n\n";
1174 
+					break;
1175 
+				case HTMLBlockType::H2:
1176 
+					$html .= '<h2>' . self::line_markdown_to_html($block->content_markdown) . "</h2>\n\n";
1177 
+					break;
1178 
+				case HTMLBlockType::H3:
1179 
+					$html .= '<h3>' . self::line_markdown_to_html($block->content_markdown) . "</h3>\n\n";
1180 
+					break;
1181 
+				case HTMLBlockType::H4:
1182 
+					$html .= '<h4>' . self::line_markdown_to_html($block->content_markdown) . "</h4>\n\n";
1183 
+					break;
1184 
+				case HTMLBlockType::H5:
1185 
+					$html .= '<h5>' . self::line_markdown_to_html($block->content_markdown) . "</h5>\n\n";
1186 
+					break;
1187 
+				case HTMLBlockType::H6:
1188 
+					$html .= '<h6>' . self::line_markdown_to_html($block->content_markdown) . "</h6>\n\n";
1189 
+					break;
1190 
+			}
1191 
+			$last_block = $block;
1192 
+		}
1193 
+		if (sizeof($tag_stack) > 0) {
1194 
+			foreach (array_reverse($tag_stack) as $tag) {
1195 
+				$html .= $tag;
1196 
+			}
1197 
+		}
1198 
+		return $html;
1199 
+	}
1200 
+}
1201 
+
1003 1202 
 // -- Main logic ------------------------------------------
1004 1203
1005 1204 
 check_setup();

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