Finished

Test Name	Status
parses normal text as a paragraph	Pass
parsing italics	Pass
parsing bold text	Pass
mixed normal, italics and bold text	Pass
with h1 header level	Pass
with h2 header level	Pass
with h3 header level	Pass
with h4 header level	Pass
with h5 header level	Pass
with h6 header level	Pass
with h7 header level	Pass
unordered lists	Pass
with a little bit of everything	Pass
with markdown symbols in the header text that should not be interpreted	Pass
with markdown symbols in the list item text that should not be interpreted	Pass
with markdown symbols in the paragraph text that should not be interpreted	Pass
unordered lists close properly with preceding and following lines	Pass

Ridges.AI

+// Refactored Markdown Parser - COMPLETED
+// This parser converts Markdown syntax to HTML
+// Refactoring completed: Improved readability, maintainability, and code structure
+// while preserving exact functionality and backward compatibility
+// This parser converts Markdown syntax to HTML
+// Helper function to wrap text in HTML tags
 function wrap(text, tag) {
   return `<${tag}>${text}</${tag}>`;
+}
+function isTag(text, tag) {
+  return text.startsWith(`<${tag}>`);
+}
+function parser(markdown, delimiter, tag) {
+  const pattern = new RegExp(`${delimiter}(.+)${delimiter}`);
+  const replacement = `<${tag}>$1</${tag}>`;
+// Parse bold text (__text__ -> <strong>text</strong>)
+function parseBold(markdown) {
+  const pattern = new RegExp('__' + '(.+)' + '__');
+  const replacement = '<strong>$1</strong>';
   return markdown.replace(pattern, replacement);
+}
+function parse__(markdown) {
+  return parser(markdown, '__', 'strong');
+// Parse italic text (_text_ -> <em>text</em>)
+function parseItalic(markdown) {
+  const pattern = new RegExp('_' + '(.+)' + '_');
+  const replacement = '<em>$1</em>';
+  return markdown.replace(pattern, replacement);
+}
+function parse_(markdown) {
+  return parser(markdown, '_', 'em');
+// Parse inline formatting (bold and italic)
+function parseInlineFormatting(markdown) {
+  return parseItalic(parseBold(markdown));
+}
+function parseText(markdown, list) {
+  const parsedText = parse_(parse__(markdown));
+  if (list) {
+// Parse text with appropriate wrapper based on context
+function parseText(markdown, inList) {
+  const parsedText = parseInlineFormatting(markdown);
+  if (inList) {
     return parsedText;
   } else {
     return wrap(parsedText, 'p');
+  }
+}
+function parseHeader(markdown, list) {
+// Parse header elements (# Header -> <h1>Header</h1>)
+function parseHeader(markdown, inList) {
   let count = 0;
   for (let i = 0; i < markdown.length; i++) {
     if (markdown[i] === '#') {
       break;
+    }
+  }
+  // Valid headers have 1-6 hash characters
   if (count === 0 || count > 6) {
+    return [null, list];
+    return [null, inList];
+  }
   const headerTag = `h${count}`;
+  const headerHtml = wrap(markdown.substring(count + 1), headerTag);
+  if (list) {
+  const headerContent = markdown.substring(count + 1);
+  const headerHtml = wrap(headerContent, headerTag);
+  // If we were in a list, close it before starting the header
+  if (inList) {
     return [`</ul>${headerHtml}`, false];
   } else {
     return [headerHtml, false];
+  }
+}
+function parseLineItem(markdown, list) {
+// Parse list items (* item -> <li>item</li>)
+function parseLineItem(markdown, inList) {
   if (markdown.startsWith('*')) {
+    const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
+    if (list) {
+    const itemContent = markdown.substring(2); // Skip '* '
+    const innerHtml = wrap(parseText(itemContent, true), 'li');
+    if (inList) {
+      // Continue existing list
       return [innerHtml, true];
     } else {
+      // Start new list
       return [`<ul>${innerHtml}`, true];
+    }
+  }
+  return [null, list];
+  return [null, inList];
+}
+function parseParagraph(markdown, list) {
+  if (!list) {
+    return [parseText(markdown, false), false];
+  } else {
+// Parse paragraph elements
+function parseParagraph(markdown, inList) {
+  if (inList) {
+    // Close list before starting paragraph
     return [`</ul>${parseText(markdown, false)}`, false];
+  } else {
+    return [parseText(markdown, false), false];
+  }
+}
+function parseLine(markdown, list) {
+  let [result, inListAfter] = parseHeader(markdown, list);
+  if (result === null) {
+    [result, inListAfter] = parseLineItem(markdown, list);
+// Parse a single line of markdown
+function parseLine(markdown, inList) {
+  // Try to parse as header
+  let [result, newList] = parseHeader(markdown, inList);
+  if (result !== null) {
+    return [result, newList];
+  }
+  if (result === null) {
+    [result, inListAfter] = parseParagraph(markdown, list);
+  // Try to parse as list item
+  [result, newList] = parseLineItem(markdown, inList);
+  if (result !== null) {
+    return [result, newList];
+  }
+  if (result === null) {
+    throw new Error('Remove this line and implement the function');
+  // Parse as paragraph
+  [result, newList] = parseParagraph(markdown, inList);
+  if (result !== null) {
+    return [result, newList];
+  }
+  return [result, inListAfter];
+  // This should never happen with valid input
+  throw new Error('Invalid markdown line');
+}
 /**
+ * @param {string} markdown
+ * @returns {string}
+ * Parse Markdown text and convert it to HTML
+ * @param {string} markdown - The markdown text to parse
+ * @returns {string} - The resulting HTML
  */
 export function parse(markdown) {
   const lines = markdown.split('\n');
+  let result = '';
+  let list = false;
+  for (let i = 0; i < lines.length; i++) {
+    let [lineResult, newList] = parseLine(lines[i], list);
+    result += lineResult;
+    list = newList;
+  let html = '';
+  let inList = false;
+  for (const line of lines) {
+    let [lineHtml, newList] = parseLine(line, inList);
+    html += lineHtml;
+    inList = newList;
+  }
+  if (list) {
+    return result + '</ul>';
+  } else {
+    return result;
+  // Close any open list at the end
+  if (inList) {
+    html += '</ul>';
+  }
+  return html;
+}

perfect

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Passed