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}</${tag}>`;
+}
+/**
+ * Markdown Parser
+ * Parses Markdown syntax and converts it to HTML
+ *
+ * Refactored to improve readability and maintainability while preserving exact functionality
+ */
+function isTag(text, tag) {
+  return text.startsWith(`<${tag}>`);
+}
+class MarkdownParser {
+  /**
+   * Wraps text with HTML tags
+   * @param {string} text - Text to wrap
+   * @param {string} tag - HTML tag to use
+   * @returns {string} Wrapped text
+   */
+  wrap(text, tag) {
+    return `<${tag}>${text}</${tag}>`;
+  }
+function parser(markdown, delimiter, tag) {
+  const pattern = new RegExp(`${delimiter}(.+)${delimiter}`);
+  const replacement = `<${tag}>$1</${tag}>`;
+  return markdown.replace(pattern, replacement);
+}
+  /**
+   * Checks if text starts with a specific HTML tag
+   * @param {string} text - Text to check
+   * @param {string} tag - HTML tag to look for
+   * @returns {boolean} True if text starts with the tag
+   */
+  isTag(text, tag) {
+    return text.startsWith(`<${tag}>`);
+  }
+function parse__(markdown) {
+  return parser(markdown, '__', 'strong');
+}
+  /**
+   * Generic parser for text formatting
+   * @param {string} markdown - Markdown text
+   * @param {string} delimiter - Delimiter to look for
+   * @param {string} tag - HTML tag to replace with
+   * @returns {string} Parsed text
+   */
+  parseWithDelimiter(markdown, delimiter, tag) {
+    const pattern = new RegExp(`${delimiter}(.+)${delimiter}`);
+    const replacement = `<${tag}>$1</${tag}>`;
+    return markdown.replace(pattern, replacement);
+  }
+function parse_(markdown) {
+  return parser(markdown, '_', 'em');
+}
+  /**
+   * Parses strong text (__text__)
+   * @param {string} markdown - Markdown text
+   * @returns {string} Parsed strong text
+   */
+  parseStrong(markdown) {
+    return this.parseWithDelimiter(markdown, '__', 'strong');
+  }
+function parseText(markdown, list) {
+  const parsedText = parse_(parse__(markdown));
+  if (list) {
+    return parsedText;
+  } else {
+    return wrap(parsedText, 'p');
+  /**
+   * Parses emphasis text (_text_)
+   * @param {string} markdown - Markdown text
+   * @returns {string} Parsed emphasis text
+   */
+  parseEmphasis(markdown) {
+    return this.parseWithDelimiter(markdown, '_', 'em');
+  }
+}
+function parseHeader(markdown, list) {
+  let count = 0;
+  for (let i = 0; i < markdown.length; i++) {
+    if (markdown[i] === '#') {
+      count += 1;
+  /**
+   * Parses inline text formatting (strong and emphasis)
+   * @param {string} markdown - Markdown text
+   * @param {boolean} inList - Whether we're currently in a list
+   * @returns {string} Parsed text
+   */
+  parseInlineText(markdown, inList) {
+    const parsedText = this.parseEmphasis(this.parseStrong(markdown));
+    if (inList) {
+      return parsedText;
     } else {
+      break;
+      return this.wrap(parsedText, 'p');
+    }
+  }
+  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];
+  /**
+   * Parses header text (# Header)
+   * @param {string} markdown - Markdown text
+   * @param {boolean} inList - Whether we're currently in a list
+   * @returns {[string|null, boolean]} Parsed header HTML and updated list state
+   */
+  parseHeader(markdown, inList) {
+    let count = 0;
+    for (let i = 0; i < markdown.length; i++) {
+      if (markdown[i] === '#') {
+        count += 1;
+      } else {
+        break;
+      }
+    }
+    // Headers must be between 1 and 6 # characters
+    if (count === 0 || count > 6) {
+      return [null, inList];
+    }
+    const headerTag = `h${count}`;
+    const headerContent = markdown.substring(count + 1);
+    const headerHtml = this.wrap(headerContent, headerTag);
+    // If we were in a list, close it before the header
+    if (inList) {
+      return [`</ul>${headerHtml}`, false];
     } else {
+      return [`<ul>${innerHtml}`, true];
+      return [headerHtml, false];
+    }
+  }
+  return [null, list];
+}
+function parseParagraph(markdown, list) {
+  if (!list) {
+    return [parseText(markdown, false), false];
+  } else {
+    return [`</ul>${parseText(markdown, false)}`, false];
+  /**
+   * Parses list items (* item)
+   * @param {string} markdown - Markdown text
+   * @param {boolean} inList - Whether we're currently in a list
+   * @returns {[string|null, boolean]} Parsed list item HTML and updated list state
+   */
+  parseListItem(markdown, inList) {
+    if (markdown.startsWith('*')) {
+      const itemContent = markdown.substring(2);
+      const innerHtml = this.wrap(this.parseInlineText(itemContent, true), 'li');
+      // If we're already in a list, just add the item
+      // Otherwise, start a new list
+      if (inList) {
+        return [innerHtml, true];
+      } else {
+        return [`<ul>${innerHtml}`, true];
+      }
+    }
+    return [null, inList];
+  }
+}
+function parseLine(markdown, list) {
+  let [result, inListAfter] = parseHeader(markdown, list);
+  if (result === null) {
+    [result, inListAfter] = parseLineItem(markdown, list);
+  /**
+   * Parses paragraph text
+   * @param {string} markdown - Markdown text
+   * @param {boolean} inList - Whether we're currently in a list
+   * @returns {[string, boolean]} Parsed paragraph HTML and updated list state
+   */
+  parseParagraph(markdown, inList) {
+    // If we were in a list, close it before the paragraph
+    if (inList) {
+      return [`</ul>${this.parseInlineText(markdown, false)}`, false];
+    } else {
+      return [this.parseInlineText(markdown, false), false];
+    }
+  }
+  if (result === null) {
+    [result, inListAfter] = parseParagraph(markdown, list);
+  /**
+   * Parses a single line of markdown
+   * @param {string} markdown - Markdown text
+   * @param {boolean} inList - Whether we're currently in a list
+   * @returns {[string, boolean]} Parsed HTML and updated list state
+   */
+  parseLine(markdown, inList) {
+    // Try to parse as header first
+    let [result, newListState] = this.parseHeader(markdown, inList);
+    if (result !== null) {
+      return [result, newListState];
+    }
+    // Try to parse as list item
+    [result, newListState] = this.parseListItem(markdown, inList);
+    if (result !== null) {
+      return [result, newListState];
+    }
+    // Default to paragraph
+    [result, newListState] = this.parseParagraph(markdown, inList);
+    if (result !== null) {
+      return [result, newListState];
+    }
+    // This should never happen with valid input
+    throw new Error('Unable to parse line: ' + markdown);
+  }
+  if (result === null) {
+    throw new Error('Remove this line and implement the function');
+  /**
+   * Parses multi-line markdown text
+   * @param {string} markdown - Markdown text
+   * @returns {string} Parsed HTML
+   */
+  parse(markdown) {
+    const lines = markdown.split('\n');
+    let result = '';
+    let inList = false;
+    for (const line of lines) {
+      let [lineResult, newListState] = this.parseLine(line, inList);
+      result += lineResult;
+      inList = newListState;
+    }
+    // Close any open list at the end
+    if (inList) {
+      result += '</ul>';
+    }
+    return result;
+  }
+  return [result, inListAfter];
+}
+// Create a singleton instance for backward compatibility
+const parser = new MarkdownParser();
 /**
+ * @param {string} markdown
+ * @returns {string}
+ * Parses Markdown syntax and converts it to HTML
+ * @param {string} markdown - Markdown text to parse
+ * @returns {string} HTML representation of the markdown
  */
 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);
+}