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

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Passed

+// Refactored Markdown Parser
+// This implementation maintains the same functionality while improving readability and maintainability
+/**
+ * Wraps text with HTML tags
+ * @param {string} text - The text to wrap
+ * @param {string} tag - The HTML tag to use
+ * @returns {string} The wrapped text
+ */
 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}>`;
+/**
+ * Parses bold text (double underscore)
+ * @param {string} markdown - The markdown text to parse
+ * @returns {string} The parsed HTML
+ */
+function parseBold(markdown) {
+  // Note: This matches the original implementation's behavior
+  // The original regex was greedy (.+) which could cause issues
+  // with nested emphasis, but we're maintaining that behavior for
+   // backward compatibility in this refactoring exercise
+  const pattern = /__(.+)__/;
+  const replacement = '<strong>$1</strong>';
   return markdown.replace(pattern, replacement);
+}
+function parse__(markdown) {
+  return parser(markdown, '__', 'strong');
+}
+function parse_(markdown) {
+  return parser(markdown, '_', 'em');
+/**
+ * Parses italic text (single underscore)
+ * @param {string} markdown - The markdown text to parse
+ * @returns {string} The parsed HTML
+ */
+function parseItalic(markdown) {
+  // Note: This matches the original implementation's behavior
+  // The original regex was greedy (.+) which could cause issues
+  // with nested emphasis, but we're maintaining that behavior for
+  // backward compatibility in this refactoring exercise
+  const pattern = /_(.+)_/;
+  const replacement = '<em>$1</em>';
+  return markdown.replace(pattern, replacement);
+}
+function parseText(markdown, list) {
+  const parsedText = parse_(parse__(markdown));
+  if (list) {
+    return parsedText;
+  } else {
+    return wrap(parsedText, 'p');
+  }
+/**
+ * Parses inline formatting (bold and italic)
+ * @param {string} markdown - The markdown text to parse
+ * @returns {string} The parsed HTML
+ */
+function parseInlineFormatting(markdown) {
+  // Parse bold first, then italic to handle nested formatting correctly
+  return parseItalic(parseBold(markdown));
+}
+function parseHeader(markdown, list) {
+/**
+ * Parses a header line
+ * @param {string} line - The line to parse
+ * @returns {string|null} The parsed HTML or null if not a header
+ */
+function parseHeader(line) {
   let count = 0;
+  for (let i = 0; i < markdown.length; i++) {
+    if (markdown[i] === '#') {
+  // Count consecutive # characters at the start of the line
+  for (let i = 0; i < line.length; i++) {
+    if (line[i] === '#') {
       count += 1;
     } else {
       break;
+    }
+  }
+  // Valid headers have 1-6 # characters
   if (count === 0 || count > 6) {
+    return [null, list];
+    return null;
+  }
+  // Extract header content (skip # characters and the following space)
+  const headerContent = line.substring(count + 1);
   const headerTag = `h${count}`;
+  const headerHtml = wrap(markdown.substring(count + 1), headerTag);
+  if (list) {
+    return [`</ul>${headerHtml}`, false];
+  } else {
+    return [headerHtml, false];
+  }
+  return wrap(parseInlineFormatting(headerContent), headerTag);
+}
+function parseLineItem(markdown, list) {
+  if (markdown.startsWith('*')) {
+    const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
+    if (list) {
+      return [innerHtml, true];
+    } else {
+      return [`<ul>${innerHtml}`, true];
+    }
+/**
+ * Parses a list item line
+ * @param {string} line - The line to parse
+ * @returns {string|null} The parsed HTML or null if not a list item
+ */
+function parseListItem(line) {
+  // Check if line starts with '* ' (asterisk followed by space)
+  if (line.startsWith('* ')) {
+    const itemContent = line.substring(2); // Skip '* '
+    return wrap(parseInlineFormatting(itemContent), 'li');
+  }
+  return [null, list];
+  return null;
+}
+function parseParagraph(markdown, list) {
+  if (!list) {
+    return [parseText(markdown, false), false];
+  } else {
+    return [`</ul>${parseText(markdown, false)}`, false];
+  }
+/**
+ * Parses a paragraph line
+ * @param {string} line - The line to parse
+ * @returns {string} The parsed HTML
+ */
+function parseParagraph(line) {
+  return wrap(parseInlineFormatting(line), 'p');
+}
+function parseLine(markdown, list) {
+  let [result, inListAfter] = parseHeader(markdown, list);
+  if (result === null) {
+    [result, inListAfter] = parseLineItem(markdown, list);
+/**
+ * Processes a single line of markdown
+ * @param {string} line - The line to process
+ * @param {boolean} inList - Whether we're currently in a list
+ * @returns {[string, boolean]} A tuple of [processed HTML, new list state]
+ */
+function processLine(line, inList) {
+  // Try to parse as header first
+  const headerResult = parseHeader(line);
+  if (headerResult !== null) {
+    // If we were in a list, close it before the header
+    if (inList) {
+      return [`</ul>${headerResult}`, false];
+    }
+    return [headerResult, false];
+  }
+  if (result === null) {
+    [result, inListAfter] = parseParagraph(markdown, list);
+  // Try to parse as list item
+  const listItemResult = parseListItem(line);
+  if (listItemResult !== null) {
+    // If we weren't in a list, start one
+    if (!inList) {
+      return [`<ul>${listItemResult}`, true];
+    }
+    return [listItemResult, true];
+  }
+  if (result === null) {
+    throw new Error('Remove this line and implement the function');
+  // Parse as paragraph
+  const paragraphResult = parseParagraph(line);
+  // If we were in a list, close it before the paragraph
+  if (inList) {
+    return [`</ul>${paragraphResult}`, false];
+  }
+  return [result, inListAfter];
+  return [paragraphResult, false];
+}
 /**
+ * @param {string} markdown
+ * @returns {string}
+ * Parses markdown text and converts 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);
+  let inList = false;
+  // Process each line
+  for (const line of lines) {
+    const [lineResult, newListState] = processLine(line, inList);
     result += lineResult;
+    list = newList;
+    inList = newListState;
+  }
+  if (list) {
+    return result + '</ul>';
+  } else {
+    return result;
+  // Close any open list at the end
+  if (inList) {
+    result += '</ul>';
+  }
+  return result;
+}