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}</${tag}>`;
+}
+function isTag(text, tag) {
+  return text.startsWith(`<${tag}>`);
+}
+function parser(markdown, delimiter, tag) {
+  const pattern = new RegExp(`${delimiter}(.+)${delimiter}`);
+  const replacement = `<${tag}>$1</${tag}>`;
+  return markdown.replace(pattern, replacement);
+}
+function parse__(markdown) {
+  return parser(markdown, '__', 'strong');
+}
+function parse_(markdown) {
+  return parser(markdown, '_', 'em');
+}
+function parseText(markdown, list) {
+  const parsedText = parse_(parse__(markdown));
+  if (list) {
+    return parsedText;
+  } else {
+    return wrap(parsedText, 'p');
+  }
+}
+function parseHeader(markdown, list) {
+  let count = 0;
+  for (let i = 0; i < markdown.length; i++) {
+    if (markdown[i] === '#') {
+      count += 1;
+    } else {
+      break;
+/**
+ * A Markdown parser that converts Markdown syntax to HTML
+ * Supports headers (#), bold (__text__), italic (_text_), and lists (*)
+ */
+class MarkdownParser {
+  /**
+   * Parse Markdown text and convert it to HTML
+   * @param {string} markdown - The Markdown text to parse
+   * @returns {string} - The resulting HTML
+   */
+  parse(markdown) {
+    const lines = markdown.split('\n');
+    let html = '';
+    let inList = false;
+    for (const line of lines) {
+      const result = this.parseLine(line, inList);
+      html += result.html;
+      inList = result.inList;
+    }
+    // Close any open list at the end
+    if (inList) {
+      html += '</ul>';
+    }
+    return html;
+  }
+  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];
+  /**
+   * Parse a single line of Markdown
+   * @param {string} line - The line to parse
+   * @param {boolean} inList - Whether we're currently in a list
+   * @returns {object} - Object with html and inList properties
+   */
+  parseLine(line, inList) {
+    // Try to parse as header
+    const headerResult = this.parseHeader(line, inList);
+    if (headerResult.matched) {
+      return { html: headerResult.html, inList: headerResult.inList };
+    }
+    // Try to parse as list item
+    const listItemResult = this.parseListItem(line, inList);
+    if (listItemResult.matched) {
+      return { html: listItemResult.html, inList: listItemResult.inList };
+    }
+    // Parse as paragraph
+    const paragraphResult = this.parseParagraph(line, inList);
+    return { html: paragraphResult.html, inList: paragraphResult.inList };
+  }
+}
+function parseLineItem(markdown, list) {
+  if (markdown.startsWith('*')) {
+    const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
+    if (list) {
+      return [innerHtml, true];
+    } else {
+      return [`<ul>${innerHtml}`, true];
+  /**
+   * Parse a header (# Header)
+   * @param {string} line - The line to parse
+   * @param {boolean} inList - Whether we're currently in a list
+   * @returns {object} - Object with matched, html, and inList properties
+   */
+  parseHeader(line, inList) {
+    // Count the number of # characters at the start of the line
+    let count = 0;
+    for (let i = 0; i < line.length; i++) {
+      if (line[i] === '#') {
+        count++;
+      } else {
+        break;
+      }
+    }
+    // Headers must have 1-6 # characters
+    if (count === 0 || count > 6) {
+      return { matched: false };
+    }
+    // Extract the header text (skip the # characters and the following space)
+    const headerText = line.substring(count + 1);
+    const headerTag = `h${count}`;
+    const headerHtml = this.wrapHtml(headerText, headerTag);
+    // If we were in a list, close it before the header
+    const html = inList ? `</ul>${headerHtml}` : headerHtml;
+    return { matched: true, html, inList: false };
+  }
+  return [null, list];
+}
+function parseParagraph(markdown, list) {
+  if (!list) {
+    return [parseText(markdown, false), false];
+  } else {
+    return [`</ul>${parseText(markdown, false)}`, false];
+  /**
+   * Parse a list item (* item)
+   * @param {string} line - The line to parse
+   * @param {boolean} inList - Whether we're currently in a list
+   * @returns {object} - Object with matched, html, and inList properties
+   */
+  parseListItem(line, inList) {
+    // Check if the line starts with '* '
+    if (!line.startsWith('* ')) {
+      return { matched: false };
+    }
+    // Extract the list item text (skip '* ')
+    const itemText = line.substring(2);
+    // Parse any inline formatting in the item text
+    const parsedText = this.parseInlineFormatting(itemText);
+    // Wrap the text in <li> tags
+    const itemHtml = this.wrapHtml(parsedText, 'li');
+    // If we weren't already in a list, start one
+    const html = inList ? itemHtml : `<ul>${itemHtml}`;
+    return { matched: true, html, inList: true };
+  }
+}
+function parseLine(markdown, list) {
+  let [result, inListAfter] = parseHeader(markdown, list);
+  if (result === null) {
+    [result, inListAfter] = parseLineItem(markdown, list);
+  /**
+   * Parse a paragraph
+   * @param {string} line - The line to parse
+   * @param {boolean} inList - Whether we're currently in a list
+   * @returns {object} - Object with html and inList properties
+   */
+  parseParagraph(line, inList) {
+    // Parse any inline formatting in the paragraph text
+    const parsedText = this.parseInlineFormatting(line);
+    // Wrap the text in <p> tags
+    const paragraphHtml = this.wrapHtml(parsedText, 'p');
+    // If we were in a list, close it before the paragraph
+    const html = inList ? `</ul>${paragraphHtml}` : paragraphHtml;
+    return { html, inList: false };
+  }
+  if (result === null) {
+    [result, inListAfter] = parseParagraph(markdown, list);
+  /**
+   * Parse inline formatting (__bold__ and _italic_)
+   * @param {string} text - The text to parse
+   * @returns {string} - The text with inline formatting converted to HTML
+   */
+  parseInlineFormatting(text) {
+    // Parse bold text (__text__ -> <strong>text</strong>)
+    let result = text.replace(/__(.+)__/g, '<strong>$1</strong>');
+    // Parse italic text (_text_ -> <em>text</em>)
+    result = result.replace(/_(.+)_/g, '<em>$1</em>');
+    return result;
+  }
+  if (result === null) {
+    throw new Error('Remove this line and implement the function');
+  /**
+   * Wrap text in HTML tags
+   * @param {string} text - The text to wrap
+   * @param {string} tag - The HTML tag to use
+   * @returns {string} - The wrapped HTML
+   */
+  wrapHtml(text, tag) {
+    return `<${tag}>${text}</${tag}>`;
+  }
+  return [result, inListAfter];
+}
+// Create a single instance of the parser
+const parser = new MarkdownParser();
 /**
+ * @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;
+  }
+  if (list) {
+    return result + '</ul>';
+  } else {
+    return result;
+  }
+  return parser.parse(markdown);
+}