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}</${tag}>`;
+}
+// REFACTORING NOTES:
+// 1. Renamed confusing function names (parse__, parse_) to descriptive ones
+// 2. Separated text formatting logic from HTML wrapping logic
+// 3. Created consistent interfaces across all functions
+// 4. Improved code organization and readability
+function isTag(text, tag) {
+  return text.startsWith(`<${tag}>`);
+// HTML generation utilities
+function createHtmlElement(content, tag) {
+  return `<${tag}>${content}</${tag}>`;
+}
+function parser(markdown, delimiter, tag) {
+  const pattern = new RegExp(`${delimiter}(.+)${delimiter}`);
+  const replacement = `<${tag}>$1</${tag}>`;
+  return markdown.replace(pattern, replacement);
+// Text formatting functions - handle inline markdown
+function parseBoldText(text) {
+  const boldPattern = /__(.+)__/;
+  return text.replace(boldPattern, '<strong>$1</strong>');
+}
+function parse__(markdown) {
+  return parser(markdown, '__', 'strong');
+function parseItalicText(text) {
+  const italicPattern = /_(.+)_/;
+  return text.replace(italicPattern, '<em>$1</em>');
+}
+function parse_(markdown) {
+  return parser(markdown, '_', 'em');
+// Parse all inline formatting (bold, italic) in order
+function parseInlineFormatting(text) {
+  return parseItalicText(parseBoldText(text));
+}
+function parseText(markdown, list) {
+  const parsedText = parse_(parse__(markdown));
+  if (list) {
+    return parsedText;
+  } else {
+    return wrap(parsedText, 'p');
+  }
+// Process text content with optional paragraph wrapping
+function processTextContent(text, skipParagraphWrap = false) {
+  const formattedText = parseInlineFormatting(text);
+  return skipParagraphWrap ? formattedText : createHtmlElement(formattedText, 'p');
+}
+function parseHeader(markdown, list) {
+  let count = 0;
+// Parse header markdown (# Header 1, ## Header 2, etc.)
+function parseHeader(markdown, isInList) {
+  // Count consecutive # characters at the start
+  let headerLevel = 0;
   for (let i = 0; i < markdown.length; i++) {
     if (markdown[i] === '#') {
+      count += 1;
+      headerLevel += 1;
     } else {
       break;
+    }
+  }
+  if (count === 0 || count > 6) {
+    return [null, list];
+  // Valid headers have 1-6 # characters
+  if (headerLevel === 0 || headerLevel > 6) {
+    return [null, isInList];
+  }
+  const headerTag = `h${count}`;
+  const headerHtml = wrap(markdown.substring(count + 1), headerTag);
+  if (list) {
+  // Extract header content (skip # characters and the following space)
+  const headerContent = markdown.substring(headerLevel + 1);
+  const headerTag = `h${headerLevel}`;
+  const headerHtml = createHtmlElement(headerContent, headerTag);
+  // Close any open list before starting a header
+  if (isInList) {
     return [`</ul>${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>${innerHtml}`, true];
+    }
+// Parse list item markdown (* List item)
+function parseListItem(markdown, isInList) {
+  if (!markdown.startsWith('*')) {
+    return [null, isInList];
+  }
+  // Extract list item content (skip '* ' prefix)
+  const listItemContent = markdown.substring(2);
+  const processedContent = processTextContent(listItemContent, true); // Skip paragraph wrap for list items
+  const listItemHtml = createHtmlElement(processedContent, 'li');
+  if (isInList) {
+    return [listItemHtml, true];
+  } else {
+    return [`<ul>${listItemHtml}`, true];
+  }
+  return [null, list];
+}
+function parseParagraph(markdown, list) {
+  if (!list) {
+    return [parseText(markdown, false), false];
+// Parse regular paragraph text
+function parseParagraph(markdown, isInList) {
+  const paragraphHtml = processTextContent(markdown, false);
+  // Close any open list before starting a paragraph
+  if (isInList) {
+    return [`</ul>${paragraphHtml}`, false];
   } else {
+    return [`</ul>${parseText(markdown, false)}`, false];
+    return [paragraphHtml, 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, determining its type and converting to HTML
+// Returns [htmlResult, isInListAfterParsing]
+function parseLine(markdown, isInList) {
+  // Try parsing as header first
+  let [htmlResult, newInListState] = parseHeader(markdown, isInList);
+  // If not a header, try parsing as list item
+  if (htmlResult === null) {
+    [htmlResult, newInListState] = parseListItem(markdown, isInList);
+  }
+  if (result === null) {
+    [result, inListAfter] = parseParagraph(markdown, list);
+  // If not a list item, parse as paragraph
+  if (htmlResult === null) {
+    [htmlResult, newInListState] = parseParagraph(markdown, isInList);
+  }
+  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 equivalent HTML
  */
 export function parse(markdown) {
   const lines = markdown.split('\n');
+  let result = '';
+  let list = false;
+  let htmlResult = '';
+  let isInList = false;
+  // Process each line of markdown
   for (let i = 0; i < lines.length; i++) {
+    let [lineResult, newList] = parseLine(lines[i], list);
+    result += lineResult;
+    list = newList;
+    const [lineHtml, newInListState] = parseLine(lines[i], isInList);
+    htmlResult += lineHtml;
+    isInList = newInListState;
+  }
+  if (list) {
+    return result + '</ul>';
+  // Close any unclosed list at the end
+  if (isInList) {
+    return htmlResult + '</ul>';
   } else {
+    return result;
+    return htmlResult;
+  }
+}