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 refactored version improves readability and maintainability while
+ * preserving all existing functionality.
+ */
+// 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 = /__(.+)__/;
+  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 = /_(.+)_/;
+  const replacement = '<em>$1</em>';
+  return markdown.replace(pattern, replacement);
+}
+function parse_(markdown) {
+  return parser(markdown, '_', 'em');
+// Parse inline formatting (bold and italic)
+function parseInlineFormatting(markdown) {
+  return parseItalic(parseBold(markdown));
+}
+function parseText(markdown, list) {
+  const parsedText = parse_(parse__(markdown));
+  if (list) {
+    return parsedText;
+  } else {
+    return wrap(parsedText, 'p');
+  }
+// Parse text content, optionally wrapping in paragraph tags
+function parseText(markdown, inList = false) {
+  const formattedText = parseInlineFormatting(markdown);
+  return inList ? formattedText : wrap(formattedText, 'p');
+}
+function parseHeader(markdown, list) {
+  let count = 0;
+// Parse header (# Header -> <h1>Header</h1>)
+function parseHeader(markdown, currentlyInList) {
+  // Count leading # characters
+  let headerLevel = 0;
   for (let i = 0; i < markdown.length; i++) {
     if (markdown[i] === '#') {
+      count += 1;
+      headerLevel++;
     } else {
       break;
+    }
+  }
+  if (count === 0 || count > 6) {
+    return [null, list];
+  // Valid headers have 1-6 # characters
+  if (headerLevel === 0 || headerLevel > 6) {
+    return [null, currentlyInList];
+  }
+  const headerTag = `h${count}`;
+  const headerHtml = wrap(markdown.substring(count + 1), headerTag);
+  if (list) {
+  // Extract header content (skip # characters and space)
+  const headerContent = markdown.substring(headerLevel + 1);
+  const headerTag = `h${headerLevel}`;
+  const headerHtml = wrap(headerContent, headerTag);
+  // If we were in a list, close it before the header
+  if (currentlyInList) {
     return [`</ul>${headerHtml}`, false];
+  } else {
+    return [headerHtml, false];
+  }
+  return [headerHtml, false];
+}
+function parseLineItem(markdown, list) {
+  if (markdown.startsWith('*')) {
+    const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
+    if (list) {
+      return [innerHtml, true];
+    } else {
+      return [`<ul>${innerHtml}`, true];
+    }
+// Parse list items (* item -> <ul><li>item</li>)
+function parseListItem(markdown, currentlyInList) {
+  if (!markdown.startsWith('*')) {
+    return [null, currentlyInList];
+  }
+  // Extract list item content (skip '* ' prefix)
+  const itemContent = markdown.substring(2);
+  const listItemHtml = wrap(parseText(itemContent, true), 'li');
+  // If we're already in a list, just add the list item
+  // Otherwise, start a new list
+  if (currentlyInList) {
+    return [listItemHtml, true];
+  } else {
+    return [`<ul>${listItemHtml}`, true];
+  }
+  return [null, list];
+}
+function parseParagraph(markdown, list) {
+  if (!list) {
+    return [parseText(markdown, false), false];
+  } else {
+// Parse paragraph content
+function parseParagraph(markdown, currentlyInList) {
+  // If we were in a list, close it before the paragraph
+  if (currentlyInList) {
     return [`</ul>${parseText(markdown, false)}`, false];
+  }
+  return [parseText(markdown, false), false];
+}
+function parseLine(markdown, list) {
+  let [result, inListAfter] = parseHeader(markdown, list);
+// Parse a single line of markdown
+function parseLine(markdown, currentlyInList) {
+  // Try parsing as header first
+  let [result, newListState] = parseHeader(markdown, currentlyInList);
+  // If not a header, try parsing as list item
   if (result === null) {
+    [result, inListAfter] = parseLineItem(markdown, list);
+    [result, newListState] = parseListItem(markdown, currentlyInList);
+  }
+  // If not a list item, parse as paragraph
   if (result === null) {
+    [result, inListAfter] = parseParagraph(markdown, list);
+    [result, newListState] = parseParagraph(markdown, currentlyInList);
+  }
+  // This should never happen with valid input
   if (result === null) {
+    throw new Error('Remove this line and implement the function');
+    throw new Error('Invalid markdown line');
+  }
+  return [result, inListAfter];
+  return [result, newListState];
+}
 /**
+ * @param {string} markdown
+ * @returns {string}
+ * Parse markdown text and convert 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 htmlResult = '';
+  let inList = false;
+  // Process each line
+  for (const line of lines) {
+    const [lineHtml, newListState] = parseLine(line, inList);
+    htmlResult += lineHtml;
+    inList = newListState;
+  }
+  if (list) {
+    return result + '</ul>';
+  } else {
+    return result;
+  // Close any open list at the end
+  if (inList) {
+    htmlResult += '</ul>';
+  }
+  return htmlResult;
+}