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}</${tag}>`;
+}
+/**
+ * REFACTORING NOTES:
+ * This markdown parser has been refactored for improved readability and maintainability.
+ * Key improvements made:
+ * 1. Renamed functions to be more descriptive (parseLineItem -> parseListItem, parse__ -> -> parseBold, parse_ -> -> parseItalic)
+ *  2. Added comprehensive JSDoc documentation for all functions
+ * 3. Improved variable names for clarity (list -> currentlyInList, markdown -> markdownLine, result -> htmlResult)
+ * 4. Added inline comments to explain complex logic
+ * 5. Removed unused code (isTag function)
+ * 6. Improved code structure and flow
+ * 7. Used more descriptive parameter names
+ *
+ * All functionality has been preserved - the parser produces identical output to the original.
+ */
+function isTag(text, tag) {
+  return text.startsWith(`<${tag}>`);
+/**
+ * Wrap text content in HTML tags
+ * @param {string} content - The content to wrap
+ * @param {string} tagName - The HTML tag name (e.g., 'p', 'h1', 'li')
+ * @returns {string} - The content wrapped in HTML tags
+ */
+function wrap(content, tagName) {
+  return `<${tagName}>${content}</${tagName}>`;
+}
+function parser(markdown, delimiter, tag) {
+/**
+ * Generic function to wrap text with HTML tags when surrounded by delimiters
+ * @param {string} text - The text to parse
+ * @param {string} delimiter - The delimiter to look for (e.g., '__' for bold)
+ * @param {string} tagName - The HTML tag to wrap with (e.g., 'strong' for bold)
+ * @returns {string} - The text with delimiters replaced by HTML tags
+ */
+function parser(text, delimiter, tagName) {
   const pattern = new RegExp(`${delimiter}(.+)${delimiter}`);
+  const replacement = `<${tag}>$1</${tag}>`;
+  return markdown.replace(pattern, replacement);
+  const replacement = `<${tagName}>$1</${tagName}>`;
+  return text.replace(pattern, replacement);
+}
+function parse__(markdown) {
+  return parser(markdown, '__', 'strong');
+/**
+ * Parse bold text surrounded by __ delimiters
+ * @param {string} text - The text to parse
+ * @returns {string} - The text with __text__ converted to <strong>text</strong>
+ */
+function parseBold(text) {
+  return parser(text, '__', 'strong');
+}
+function parse_(markdown) {
+  return parser(markdown, '_', 'em');
+/**
+ * Parse italic text surrounded by _ delimiters
+ * @param {string} text - The text to parse
+ * @returns {string} - The text with _text_ converted to <em>text</em>
+ */
+function parseItalic(text) {
+  return parser(text, '_', 'em');
+}
+function parseText(markdown, list) {
+  const parsedText = parse_(parse__(markdown));
+  if (list) {
+    return parsedText;
+/**
+ * Parse inline markdown formatting (__ for bold, _ for italic) in text
+ * @param {string} text - The text to parse
+ * @param {boolean} inList - Whether the text is inside a list item
+ * @returns {string} - The text with inline formatting converted to HTML
+ */
+function parseText(text, inList) {
+  // Parse bold (__text__) and italic (_text_) formatting
+  const formattedText = parseItalic(parseBold(text));
+  // If we're in a list, don't wrap in paragraph tags
+  if (inList) {
+    return formattedText;
   } else {
+    return wrap(parsedText, 'p');
+    return wrap(formattedText, 'p');
+  }
+}
+function parseHeader(markdown, list) {
+  let count = 0;
+  for (let i = 0; i < markdown.length; i++) {
+    if (markdown[i] === '#') {
+      count += 1;
+/**
+ * Parse a markdown header (starts with #)
+ * @param {string} markdownLine - The markdown line to parse
+ * @param {boolean} currentlyInList - Whether we are currently inside a list
+ * @returns {Array} - [htmlResult, newInListState] or [null, currentlyInList] if not a header
+ */
+function parseHeader(markdownLine, currentlyInList) {
+  // Count the number of consecutive # characters at the start
+  let headerLevel = 0;
+  for (let i = 0; i < markdownLine.length; i++) {
+    if (markdownLine[i] === '#') {
+      headerLevel += 1;
     } else {
       break;
+    }
+  }
+  if (count === 0 || count > 6) {
+    return [null, list];
+  // Headers must be between 1 and 6 # characters
+  if (headerLevel === 0 || headerLevel > 6) {
+    return [null, currentlyInList];
+  }
+  const headerTag = `h${count}`;
+  const headerHtml = wrap(markdown.substring(count + 1), headerTag);
+  if (list) {
+  // Create the header tag (h1, h2, etc.)
+  const headerTag = `h${headerLevel}`;
+  // Remove the # characters and the space, then wrap in header tag
+  const headerContent = markdownLine.substring(headerLevel + 1);
+  const headerHtml = wrap(headerContent, headerTag);
+  // If we were in a list, close it before starting the header
+  if (currentlyInList) {
     return [`</ul>${headerHtml}`, false];
   } else {
     return [headerHtml, false];
+  }
+}
+function parseLineItem(markdown, list) {
+  if (markdown.startsWith('*')) {
+    const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
+    if (list) {
+      return [innerHtml, true];
+/**
+ * Parse a markdown list item (starts with *)
+ * @param {string} markdownLine - The markdown line to parse
+ * @param {boolean} currentlyInList - Whether we are currently inside a list
+ * @returns {Array} - [htmlResult, newInListState] or [null, currentlyInList] if not a list item
+ */
+function parseListItem(markdownLine, currentlyInList) {
+  if (markdownLine.startsWith('*')) {
+    // Remove the '* ' prefix and parse the remaining text
+    const itemText = markdownLine.substring(2);
+    const listItemHtml = wrap(parseText(itemText, true), 'li');
+    if (currentlyInList) {
+      // Already in a list, just add the list item
+      return [listItemHtml, true];
     } else {
+      return [`<ul>${innerHtml}`, true];
+      // Start a new list
+      return [`<ul>${listItemHtml}`, true];
+    }
+  }
+  return [null, list];
+  // Not a list item
+  return [null, currentlyInList];
+}
+function parseParagraph(markdown, list) {
+  if (!list) {
+    return [parseText(markdown, false), false];
+/**
+ * Parse a markdown paragraph (default case when not header or list item)
+ * @param {string} markdownLine - The markdown line to parse
+ * @param {boolean} currentlyInList - Whether we are currently inside a list
+ * @returns {Array} - [htmlResult, newInListState]
+ */
+function parseParagraph(markdownLine, currentlyInList) {
+  if (!currentlyInList) {
+    // Not in a list, wrap in paragraph tags
+    return [parseText(markdownLine, false), false];
   } else {
+    return [`</ul>${parseText(markdown, false)}`, false];
+    // We were in a list, so close it and start a paragraph
+    return [`</ul>${parseText(markdownLine, false)}`, false];
+  }
+}
+function parseLine(markdown, list) {
+  let [result, inListAfter] = parseHeader(markdown, list);
+  if (result === null) {
+    [result, inListAfter] = parseLineItem(markdown, list);
+/**
+ * Parse a single line of markdown and return HTML with list state
+ * @param {string} markdownLine - The markdown line to parse
+ * @param {boolean} currentlyInList - Whether we are currently inside a list
+ * @returns {Array} - [htmlResult, newInListState]
+ */
+function parseLine(markdownLine, currentlyInList) {
+  // Try to parse as header first
+  let [htmlResult, newInListState] = parseHeader(markdownLine, currentlyInList);
+  // If not a header, try to parse as list item
+  if (htmlResult === null) {
+    [htmlResult, newInListState] = parseListItem(markdownLine, currentlyInList);
+  }
+  if (result === null) {
+    [result, inListAfter] = parseParagraph(markdown, list);
+  // If not a list item, parse as paragraph
+  if (htmlResult === null) {
+    [htmlResult, newInListState] = parseParagraph(markdownLine, currentlyInList);
+  }
+  if (result === null) {
+    throw new Error('Remove this line and implement the function');
+  // This should never happen as one of the parsers should always match
+  if (htmlResult === null) {
+    throw new Error('Unable to parse markdown line');
+  }
+  return [result, inListAfter];
+  return [htmlResult, newInListState];
+}
 /**
+ * @param {string} markdown
+ * @returns {string}
+ * Parse markdown text and convert 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;
+  let html = '';
+  let inList = false;
+  for (const line of lines) {
+    let [lineHtml, newListState] = parseLine(line, inList);
+    html += lineHtml;
+    inList = newListState;
+  }
+  if (list) {
+    return result + '</ul>';
+  } else {
+    return result;
+  // Close any open list tag
+  if (inList) {
+    html += '</ul>';
+  }
+  return html;
+}