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

kale

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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/italic text, paragraphs, and unordered lists.
+ */
+class MarkdownParser {
+  /**
+   * Parses a markdown string 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 result = this.parseLine(line, inList);
+      html += result.html;
+      inList = result.inList;
+    }
+  }
+  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>${innerHtml}`, true];
+    // Close any open list at the end
+    if (inList) {
+      html += '</ul>';
+    }
+    return html;
+  }
+  return [null, list];
+}
+function parseParagraph(markdown, list) {
+  if (!list) {
+    return [parseText(markdown, false), false];
+  } else {
+    return [`</ul>${parseText(markdown, false)}`, false];
+  }
+}
+function parseLine(markdown, list) {
+  let [result, inListAfter] = parseHeader(markdown, list);
+  if (result === null) {
+    [result, inListAfter] = parseLineItem(markdown, 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 {{html: string, inList: boolean}} The parsed HTML and list state
+   */
+  parseLine(line, inList) {
+    // Try to parse as header
+    const headerResult = this.parseHeader(line);
+    if (headerResult !== null) {
+      // If we were in a list, close it before the header
+      const html = inList ? `</ul>${headerResult}` : headerResult;
+      return { html, inList: false };
+    }
+    // Try to parse as list item
+    if (line.startsWith('*')) {
+      const listItemContent = line.substring(2);
+      const parsedContent = this.parseInlineFormatting(listItemContent);
+      const listItemHtml = `<li>${parsedContent}</li>`;
+      if (inList) {
+        // Continue existing list
+        return { html: listItemHtml, inList: true };
+      } else {
+        // Start new list
+        return { html: `<ul>${listItemHtml}`, inList: true };
+      }
+    }
+    // Parse as paragraph
+    const paragraphContent = this.parseInlineFormatting(line);
+    const paragraphHtml = `<p>${paragraphContent}</p>`;
+    // If we were in a list, close it before the paragraph
+    const html = inList ? `</ul>${paragraphHtml}` : paragraphHtml;
+    return { html, inList: false };
+  }
+  if (result === null) {
+    [result, inListAfter] = parseParagraph(markdown, list);
+  /**
+   * Parses header syntax (# ## ### etc.)
+   * @param {string} line - The line to parse
+   * @returns {string|null} The header HTML or null if not a header
+   */
+  parseHeader(line) {
+    let hashCount = 0;
+    for (let i = 0; i < line.length; i++) {
+      if (line[i] === '#') {
+        hashCount++;
+      } else {
+        break;
+      }
+    }
+    // Valid headers have 1-6 hash characters
+    if (hashCount === 0 || hashCount > 6) {
+      return null;
+    }
+    const headerLevel = hashCount;
+    const headerContent = line.substring(hashCount + 1);
+    const parsedContent = this.parseInlineFormatting(headerContent);
+    return `<h${headerLevel}>${parsedContent}</h${headerLevel}>`;
+  }
+  if (result === null) {
+    throw new Error('Remove this line and implement the function');
+  /**
+   * Parses inline formatting (__ for bold, _ for italic)
+   * @param {string} text - The text to parse
+   * @returns {string} The text with inline formatting converted to HTML
+   */
+  parseInlineFormatting(text) {
+    // Parse bold (__text__)
+    let result = text.replace(/__(.+)__/g, '<strong>$1</strong>');
+    // Parse italic (_text_)
+    result = result.replace(/_(.+)_/g, '<em>$1</em>');
+    return result;
+  }
+  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 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;
+  }
+  const parser = new MarkdownParser();
+  return parser.parse(markdown);
+}