parseMarkdown function

List<BlockNode> parseMarkdown(String text)

Parses raw markdown text into a list of BlockNodes.

Supported blocks: Headers, Lists, Paragraphs, and Horizontal Rules.

Implementation

List<BlockNode> parseMarkdown(String text) {
  List<String> lines = text.split('\n');
  List<BlockNode> blocks = [];
  int i = 0;
  while (i < lines.length) {
    String line = lines[i].trim();
    if (line.isEmpty) {
      i++;
      continue;
    }

    if (line.startsWith('#')) {
      int level = 0;
      while (level < line.length && line[level] == '#') {
        level++;
      }
      if (level < line.length && line[level] == ' ') {
        String headerText = line.substring(level + 1).trim();
        blocks.add(HeaderBlock(level, headerText));
        i++;
        continue;
      }
    }

    if (line.startsWith('---')) {
      blocks.add(HorizontalRuleBlock());
      i++;
      continue;
    }

    if (line.startsWith('- ')) {
      List<String> items = [];
      while (i < lines.length && lines[i].trim().startsWith('- ')) {
        items.add(lines[i].trim().substring(2).trim());
        i++;
      }
      blocks.add(ListBlock(items));
      continue;
    }

    // Paragraph
    String para = '';
    while (i < lines.length && lines[i].trim().isNotEmpty) {
      String currentLine = lines[i].trim();
      // Stop if we hit a different block type
      if (currentLine.startsWith('---')) break;
      if (currentLine.startsWith('- ')) break;
      if (currentLine.startsWith('#')) {
        int level = 0;
        while (level < currentLine.length && currentLine[level] == '#') level++;
        if (level < currentLine.length && currentLine[level] == ' ') break;
      }

      para += (para.isEmpty ? '' : '\n') + lines[i];
      i++;
    }

    if (para.isNotEmpty) {
      blocks.add(ParagraphBlock(parseInlines(para)));
    }
  }
  return blocks;
}