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

xas

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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');
+}
+/**
+ * A Markdown parser that converts Markdown syntax to HTML
+ * Supports headers (# ## ### #### ##### ######), emphasis (__ for bold, _ for italic), and lists (* item)
+ */
+class MarkdownParser {
+  /**
+   * 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
+   */
+  wrap(text, tag) {
+    return `<${tag}>${text}</${tag}>`;
+  }
+function parseText(markdown, list) {
+  const parsedText = parse_(parse__(markdown));
+  if (list) {
+    return parsedText;
+  } else {
+    return wrap(parsedText, 'p');
+  /**
+   * Parses emphasis syntax (__ for bold, _ for italic) in text
+   * @param {string} markdown - The markdown text to parse
+   * @returns {string} The text with emphasis converted to HTML
+   */
+  parseEmphasis(markdown) {
+    // Parse bold (__text__ -> <strong>text</strong>)
+    let result = markdown.replace(/__(.+)__/g, '<strong>$1</strong>');
+    // Parse italic (_text_ -> <em>text</em>)
+    result = result.replace(/_(.+)_/g, '<em>$1</em>');
+    return result;
+  }
+}
+function parseHeader(markdown, list) {
+  let count = 0;
+  for (let i = 0; i < markdown.length; i++) {
+    if (markdown[i] === '#') {
+      count += 1;
+    } else {
+      break;
+  /**
+   * Parses a header line (# Header -> <h1>Header</h1>)
+   * @param {string} line - The line to parse as a header
+   * @returns {string|null} The HTML header or null if not a valid header
+   */
+  parseHeader(line) {
+    let count = 0;
+    for (let i = 0; i < line.length; i++) {
+      if (line[i] === '#') {
+        count += 1;
+      } else {
+        break;
+      }
+    }
+    // Valid headers have 1-6 # characters
+    if (count === 0 || count > 6) {
+      return null;
+    }
+    const headerTag = `h${count}`;
+    const headerContent = line.substring(count + 1);
+    return this.wrap(headerContent, headerTag);
+  }
+  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];
+  }
+}
+function parseLineItem(markdown, list) {
+  if (markdown.startsWith('*')) {
+    const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
+    if (list) {
+      return [innerHtml, true];
+    } else {
+      return [`<ul>${innerHtml}`, true];
+  /**
+   * Parses a list item (* item -> <li>item</li>)
+   * @param {string} line - The line to parse as a list item
+   * @returns {string|null} The HTML list item or null if not a valid list item
+   */
+  parseListItem(line) {
+    if (line.startsWith('* ')) {
+      const itemContent = line.substring(2);
+      const parsedContent = this.parseEmphasis(itemContent);
+      return this.wrap(parsedContent, 'li');
+    }
+    return null;
+  }
+  return [null, list];
+}
+function parseParagraph(markdown, list) {
+  if (!list) {
+    return [parseText(markdown, false), false];
+  } else {
+    return [`</ul>${parseText(markdown, false)}`, false];
+  /**
+   * Parses a paragraph (regular text -> <p>text</p>)
+   * @param {string} line - The line to parse as a paragraph
+   * @returns {string} The HTML paragraph
+   */
+  parseParagraph(line) {
+    const parsedContent = this.parseEmphasis(line);
+    return this.wrap(parsedContent, 'p');
+  }
+}
+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);
+  }
+  if (result === null) {
+    throw new Error('Remove this line and implement the function');
+  /**
+   * Parses a single line of markdown
+   * @param {string} line - The line to parse
+   * @param {boolean} inList - Whether we're currently in a list
+   * @returns {[string, boolean]} A tuple of [HTML result, new inList state]
+   */
+  parseLine(line, inList) {
+    // Try to parse as header
+    const header = this.parseHeader(line);
+    if (header !== null) {
+      if (inList) {
+        // Close the list before starting the header
+        return [`</ul>${header}`, false];
+      } else {
+        return [header, false];
+      }
+    }
+    // Try to parse as list item
+    const listItem = this.parseListItem(line);
+    if (listItem !== null) {
+      if (inList) {
+        // Continue the existing list
+        return [listItem, true];
+      } else {
+        // Start a new list
+        return [`<ul>${listItem}`, true];
+      }
+    }
+    // Parse as paragraph
+    const paragraph = this.parseParagraph(line);
+    if (inList) {
+      // Close the list before starting the paragraph
+      return [`</ul>${paragraph}`, false];
+    } else {
+      return [paragraph, false];
+    }
+  }
+  return [result, inListAfter];
+}
 /**
+ * @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 parser = new MarkdownParser();
   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;
+  for (const line of lines) {
+    const [lineResult, newListState] = parser.parseLine(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;
+}