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

+function wrap(text, tag) {
+  return `<${tag}>${text}</${tag}>`;
+}
+// Refactored Markdown Parser
+//
+// Improvements made:
+// 1. Created a centralized ParserState class to manage list state
+// 2. Consolidated parsing logic into clearer, single-responsibility functions
+// 3. Used more descriptive variable and function names
+// 4. Restructured control flow to be more linear and easier to follow
+// 5. Added detailed comments to explain the parsing logic
+function isTag(text, tag) {
+  return text.startsWith(`<${tag}>`);
+}
+function parser(markdown, delimiter, tag) {
+  const pattern = new RegExp(`${delimiter}(.+)${delimiter}`);
+  const replacement = `<${tag}>$1</${tag}>`;
+  return markdown.replace(pattern, replacement);
+}
+class ParserState {
+  constructor() {
+    this.inList = false;
+  }
+function parse__(markdown) {
+  return parser(markdown, '__', 'strong');
+  // Handle opening and closing of list tags
+  handleListTransition(isListItem) {
+    const wasInList = this.inList;
+    this.inList = isListItem;
+    if (wasInList && !isListItem) {
+      // Close list when exiting list context
+      return "</ul>";
+    } else if (!wasInList && isListItem) {
+      // Open list when entering list context
+      return "<ul>";
+    }
+    return "";
+  }
+}
+function parse_(markdown) {
+  return parser(markdown, '_', 'em');
+// Wrap text with HTML tags
+function wrapWithTag(text, tag) {
+  return `<${tag}>${text}</${tag}>`;
+}
+function parseText(markdown, list) {
+  const parsedText = parse_(parse__(markdown));
+  if (list) {
+    return parsedText;
+  } else {
+    return wrap(parsedText, 'p');
+  }
+// Parse inline formatting (__ for strong, _ for emphasis)
+// Note: Using the same greedy regex pattern as the original implementation
+// to ensure exact behavior matching, including edge cases with overlapping patterns
+function parseInlineFormatting(text) {
+  // Parse strong formatting (__text__) first - using greedy matching like original
+  const strongPattern = /__(.+)__/g;
+  let result = text.replace(strongPattern, "<strong>$1</strong>");
+  // Parse emphasis formatting (_text_) after strong is handled - using greedy matching like original
+  const emphasisPattern = /_(.+)_/g;
+  result = result.replace(emphasisPattern, "<em>$1</em>");
+  return result;
+}
+function parseHeader(markdown, list) {
+  let count = 0;
+  for (let i = 0; i < markdown.length; i++) {
+    if (markdown[i] === '#') {
+      count += 1;
+// Parse header elements (# Header 1, ## Header 2, etc.)
+function parseHeader(line, state) {
+  // Count leading # characters
+  let headerLevel = 0;
+  for (let i = 0; i < line.length; i++) {
+    if (line[i] === "#") {
+      headerLevel++;
     } else {
       break;
+    }
+  }
+  if (count === 0 || count > 6) {
+    return [null, list];
+  }
+  const headerTag = `h${count}`;
+  const headerHtml = wrap(markdown.substring(count + 1), headerTag);
+  if (list) {
+    return [`</ul>${headerHtml}`, false];
+  } else {
+    return [headerHtml, false];
+  // Valid headers have 1-6 # characters
+  if (headerLevel === 0 || headerLevel > 6) {
+    return null;
+  }
+  // Extract header content (skip # characters and space)
+  const headerContent = line.substring(headerLevel + 1);
+  const headerTag = `h${headerLevel}`;
+  const headerHtml = wrapWithTag(headerContent, headerTag);
+  // If we were in a list, close it before the header
+  const listClosingTag = state.handleListTransition(false);
+  return listClosingTag + headerHtml;
+}
+function parseLineItem(markdown, list) {
+  if (markdown.startsWith('*')) {
+    const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
+    if (list) {
+      return [innerHtml, true];
+    } else {
+      return [`<ul>${innerHtml}`, true];
+    }
+// Parse list items (* item text)
+function parseListItem(line, state) {
+  if (!line.startsWith("* ")) {
+    return null;
+  }
+  return [null, list];
+  // Extract list item content (skip "* " prefix)
+  const itemContent = line.substring(2);
+  // Parse inline formatting in the list item
+  const formattedContent = parseInlineFormatting(itemContent);
+  // Wrap in list item tags
+  const listItemHtml = wrapWithTag(formattedContent, "li");
+  // Handle list opening/closing tags
+  const listTag = state.handleListTransition(true);
+  return listTag + listItemHtml;
+}
+function parseParagraph(markdown, list) {
+  if (!list) {
+    return [parseText(markdown, false), false];
+  } else {
+    return [`</ul>${parseText(markdown, false)}`, false];
+  }
+// Parse paragraph elements (default for lines that don't match other patterns)
+function parseParagraph(line, state) {
+  // Parse inline formatting in the paragraph
+  const formattedContent = parseInlineFormatting(line);
+  // Wrap in paragraph tags (unless we're in a list item, which is handled elsewhere)
+  const paragraphHtml = wrapWithTag(formattedContent, "p");
+  // If we were in a list, close it before the paragraph
+  const listClosingTag = state.handleListTransition(false);
+  return listClosingTag + paragraphHtml;
+}
+function parseLine(markdown, list) {
+  let [result, inListAfter] = parseHeader(markdown, list);
+  if (result === null) {
+    [result, inListAfter] = parseLineItem(markdown, list);
+  }
+  if (result === null) {
+    [result, inListAfter] = parseParagraph(markdown, list);
+// Parse a single line of markdown
+function parseLine(line, state) {
+  // Try to parse as header first
+  let result = parseHeader(line, state);
+  if (result !== null) {
+    return result;
+  }
+  if (result === null) {
+    throw new Error('Remove this line and implement the function');
+  // Try to parse as list item
+  result = parseListItem(line, state);
+  if (result !== null) {
+    return result;
+  }
+  return [result, inListAfter];
+  // Default to paragraph parsing
+  return parseParagraph(line, state);
+}
 /**
+ * @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;
+  const lines = markdown.split("\n");
+  const state = new ParserState();
+  let result = "";
+  // Process each line
+  for (const line of lines) {
+    result += parseLine(line, state);
+  }
+  if (list) {
+    return result + '</ul>';
+  } else {
+    return result;
+  // Close any open list at the end
+  if (state.inList) {
+    result += "</ul>";
+  }
+  return result;
+}