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

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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.
+ * Refactored for better readability and maintainability.
+ */
+class MarkdownParser {
+  /**
+   * Parses markdown text and converts 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 parseResult = this.parseLine(line, inList);
+      html += parseResult.html;
+      inList = parseResult.inList;
+    }
+    // Close any open list at the end
+    if (inList) {
+      html += '</ul>';
+    }
+    return html;
+  }
+  if (count === 0 || count > 6) {
+    return [null, list];
+  /**
+   * Parses 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 containing the parsed HTML and updated list state
+   */
+  parseLine(line, inList) {
+    // Try to parse as header
+    const headerResult = this.parseHeader(line, inList);
+    if (headerResult.matched) {
+      return headerResult;
+    }
+    // Try to parse as list item
+    const listItemResult = this.parseListItem(line, inList);
+    if (listItemResult.matched) {
+      return listItemResult;
+    }
+    // Parse as paragraph
+    return this.parseParagraph(line, inList);
+  }
+  const headerTag = `h${count}`;
+  const headerHtml = wrap(markdown.substring(count + 1), headerTag);
+  if (list) {
+    return [`</ul>${headerHtml}`, false];
+  } else {
+    return [headerHtml, false];
+  /**
+   * Parses header markdown (# ## ### etc.)
+   * @param {string} line - The line to parse
+   * @param {boolean} inList - Whether we're currently in a list
+   * @returns {Object} - Parse result with matched flag, html, and inList state
+   */
+  parseHeader(line, inList) {
+    const headerMatch = line.match(/^(#{1,6})\s(.*)/);
+    if (!headerMatch) {
+      return { matched: false, html: '', inList };
+    }
+    const level = headerMatch[1].length;
+    const content = headerMatch[2];
+    const headerTag = `h${level}`;
+    const htmlContent = this.parseInline(content);
+    if (inList) {
+      // Close list before header
+      return {
+        matched: true,
+        html: `</ul><${headerTag}>${htmlContent}</${headerTag}>`,
+        inList: false
+      };
+    } else {
+      return {
+        matched: true,
+        html: `<${headerTag}>${htmlContent}</${headerTag}>`,
+        inList: false
+      };
+    }
+  }
+}
+function parseLineItem(markdown, list) {
+  if (markdown.startsWith('*')) {
+    const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
+    if (list) {
+      return [innerHtml, true];
+  /**
+   * Parses list item markdown (* item)
+   * @param {string} line - The line to parse
+   * @param {boolean} inList - Whether we're currently in a list
+   * @returns {Object} - Parse result with matched flag, html, and inList state
+   */
+  parseListItem(line, inList) {
+    if (!line.startsWith('* ')) {
+      return { matched: false, html: '', inList };
+    }
+    const content = line.substring(2);
+    const htmlContent = this.parseInline(content);
+    if (inList) {
+      // Continue existing list
+      return {
+        matched: true,
+        html: `<li>${htmlContent}</li>`,
+        inList: true
+      };
     } else {
+      return [`<ul>${innerHtml}`, true];
+      // Start new list
+      return {
+        matched: true,
+        html: `<ul><li>${htmlContent}</li>`,
+        inList: true
+      };
+    }
+  }
+  return [null, list];
+}
+function parseParagraph(markdown, list) {
+  if (!list) {
+    return [parseText(markdown, false), false];
+  } else {
+    return [`</ul>${parseText(markdown, false)}`, false];
+  /**
+   * Parses paragraph markdown
+   * @param {string} line - The line to parse
+   * @param {boolean} inList - Whether we're currently in a list
+   * @returns {Object} - Parse result with matched flag, html, and inList state
+   */
+  parseParagraph(line, inList) {
+    const htmlContent = this.parseInline(line);
+    if (inList) {
+      // Close list before paragraph
+      return {
+        matched: true,
+        html: `</ul><p>${htmlContent}</p>`,
+        inList: false
+      };
+    } else {
+      return {
+        matched: true,
+        html: `<p>${htmlContent}</p>`,
+        inList: false
+      };
+    }
+  }
+}
+function parseLine(markdown, list) {
+  let [result, inListAfter] = parseHeader(markdown, list);
+  if (result === null) {
+    [result, inListAfter] = parseLineItem(markdown, list);
+  /**
+   * Parses inline markdown elements like bold and italic
+   * @param {string} text - The text to parse
+   * @returns {string} - The parsed HTML
+   */
+  parseInline(text) {
+    return this.parseEmphasis(this.parseBold(text));
+  }
+  if (result === null) {
+    [result, inListAfter] = parseParagraph(markdown, list);
+  /**
+   * Parses bold markdown (__text__)
+   * @param {string} text - The text to parse
+   * @returns {string} - The parsed HTML
+   */
+  parseBold(text) {
+    return text.replace(/__(.+)__/g, '<strong>$1</strong>');
+  }
+  if (result === null) {
+    throw new Error('Remove this line and implement the function');
+  /**
+   * Parses italic markdown (_text_)
+   * @param {string} text - The text to parse
+   * @returns {string} - The parsed HTML
+   */
+  parseEmphasis(text) {
+    return text.replace(/_(.+)_/g, '<em>$1</em>');
+  }
+  return [result, inListAfter];
+}
+// Create a singleton instance for the export
+const parser = new MarkdownParser();
 /**
+ * @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);
+    result += lineResult;
+    list = newList;
+  }
+  if (list) {
+    return result + '</ul>';
+  } else {
+    return result;
+  }
+  return parser.parse(markdown);
+}