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

\besttop

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Running Evaluation

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');
+}
+/**
+ * Refactored Markdown Parser
+ *
+ * This refactored version improves readability and maintainability while preserving
+ * all original functionality. Key improvements:
+ * 1. Encapsulated parsing logic in a class for better state management
+ * 2. Clearer separation of concerns with dedicated methods for each element type
+ * 3. Simplified control flow with early returns
+ * 4. Better variable names and structure
+ * 5. Comprehensive comments explaining the parsing logic
+ */
+function parseText(markdown, list) {
+  const parsedText = parse_(parse__(markdown));
+  if (list) {
+    return parsedText;
+  } else {
+    return wrap(parsedText, 'p');
+class MarkdownParser {
+  constructor() {
+    this.inList = false;
+  }
+}
+function parseHeader(markdown, list) {
+  let count = 0;
+  for (let i = 0; i < markdown.length; i++) {
+    if (markdown[i] === '#') {
+      count += 1;
+    } else {
+      break;
+  /**
+   * Main parsing method that converts markdown to HTML
+   * @param {string} markdown - The markdown text to parse
+   * @returns {string} - The resulting HTML
+   */
+  parse(markdown) {
+    const lines = markdown.split('\n');
+    let html = '';
+    for (const line of lines) {
+      html += this.parseLine(line);
+    }
+    // Close any open list at the end
+    if (this.inList) {
+      html += '</ul>';
+      this.inList = false;
+    }
+    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 - A single line of markdown text
+   * @returns {string} - The resulting HTML for this line
+   */
+  parseLine(line) {
+    // Try to parse as header
+    const headerResult = this.parseHeader(line);
+    if (headerResult !== null) {
+      return this.handleListTransition(false) + headerResult;
+    }
+    // Try to parse as list item
+    const listItemResult = this.parseListItem(line);
+    if (listItemResult !== null) {
+      return this.handleListTransition(true) + listItemResult;
+    }
+    // Default to paragraph
+    return this.handleListTransition(false) + this.parseParagraph(line);
+  }
+}
+function parseLineItem(markdown, list) {
+  if (markdown.startsWith('*')) {
+    const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
+    if (list) {
+      return [innerHtml, true];
+    } else {
+      return [`<ul>${innerHtml}`, true];
+  /**
+   * Handle transitions in and out of list contexts
+   * @param {boolean} enteringList - Whether we're entering or exiting a list
+   * @returns {string} - HTML for opening/closing list tags if needed
+   */
+  handleListTransition(enteringList) {
+    let html = '';
+    if (this.inList && !enteringList) {
+      // Close list when exiting
+      html += '</ul>';
+      this.inList = false;
+    } else if (!this.inList && enteringList) {
+      // Open list when entering
+      html += '<ul>';
+      this.inList = true;
+    }
+    return html;
+  }
+  return [null, list];
+}
+function parseParagraph(markdown, list) {
+  if (!list) {
+    return [parseText(markdown, false), false];
+  } else {
+    return [`</ul>${parseText(markdown, false)}`, false];
+  /**
+   * Parse header markdown (# Header 1, ## Header 2, etc.)
+   * @param {string} line - Line to parse as header
+   * @returns {string|null} - HTML header or null if not a header
+   */
+  parseHeader(line) {
+    // Count leading # characters
+    let level = 0;
+    while (level < line.length && line[level] === '#') {
+      level++;
+    }
+    // Valid headers have 1-6 # characters followed by a space
+    if (level === 0 || level > 6 || line[level] !== ' ') {
+      return null;
+    }
+    const content = line.substring(level + 1);
+    const tag = `h${level}`;
+    return `<${tag}>${this.parseInlineFormatting(content)}</${tag}>`;
+  }
+}
+function parseLine(markdown, list) {
+  let [result, inListAfter] = parseHeader(markdown, list);
+  if (result === null) {
+    [result, inListAfter] = parseLineItem(markdown, list);
+  /**
+   * Parse list item markdown (* item)
+   * @param {string} line - Line to parse as list item
+   * @returns {string|null} - HTML list item or null if not a list item
+   */
+  parseListItem(line) {
+    if (!line.startsWith('* ')) {
+      return null;
+    }
+    const content = line.substring(2);
+    return `<li>${this.parseInlineFormatting(content)}</li>`;
+  }
+  if (result === null) {
+    [result, inListAfter] = parseParagraph(markdown, list);
+  /**
+   * Parse line as paragraph
+   * @param {string} line - Line to parse as paragraph
+   * @returns {string} - HTML paragraph
+   */
+  parseParagraph(line) {
+    return `<p>${this.parseInlineFormatting(line)}</p>`;
+  }
+  if (result === null) {
+    throw new Error('Remove this line and implement the function');
+  /**
+   * Parse inline formatting (__bold__ and _italic_)
+   * @param {string} text - Text to parse for inline formatting
+   * @returns {string} - HTML with inline formatting applied
+   */
+  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}
+ * Parse markdown text and return 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);
+}