| 1 | | function wrap(text, tag) { |
| 2 | | return `<${tag}>${text}</${tag}>`; |
| 3 | | } |
| 4 | | |
| 5 | | function isTag(text, tag) { |
| 6 | | return text.startsWith(`<${tag}>`); |
| 7 | | } |
| 8 | | |
| 9 | | function parser(markdown, delimiter, tag) { |
| 10 | | const pattern = new RegExp(`${delimiter}(.+)${delimiter}`); |
| 11 | | const replacement = `<${tag}>$1</${tag}>`; |
| 12 | | return markdown.replace(pattern, replacement); |
| 13 | | } |
| 14 | | |
| 15 | | function parse__(markdown) { |
| 16 | | return parser(markdown, '__', 'strong'); |
| 17 | | } |
| 18 | | |
| 19 | | function parse_(markdown) { |
| 20 | | return parser(markdown, '_', 'em'); |
| 21 | | } |
| 22 | | |
| 23 | | function parseText(markdown, list) { |
| 24 | | const parsedText = parse_(parse__(markdown)); |
| 25 | | if (list) { |
| 26 | | return parsedText; |
| 27 | | } else { |
| 28 | | return wrap(parsedText, 'p'); |
| 29 | | } |
| 30 | | } |
| 31 | | |
| 32 | | function parseHeader(markdown, list) { |
| 33 | | let count = 0; |
| 34 | | for (let i = 0; i < markdown.length; i++) { |
| 35 | | if (markdown[i] === '#') { |
| 36 | | count += 1; |
| 37 | | } else { |
| 38 | | break; |
| 1 | /** |
| 2 | * Parses Markdown syntax and returns equivalent HTML |
| 3 | * @param {string} markdown - The markdown text to parse |
| 4 | * @returns {string} - The equivalent HTML |
| 5 | */ |
| 6 | export function parse(markdown) { |
| 7 | const lines = markdown.split('\n'); |
| 8 | let html = ''; |
| 9 | let inList = false; |
| 10 | |
| 11 | for (const line of lines) { |
| 12 | let lineHtml = ''; |
| 13 | let currentlyInList = inList; |
| 14 | |
| 15 | // Check for headers (#, ##, ###, etc.) |
| 16 | const headerMatch = line.match(/^(#{1,6})\s+(.*)$/); |
| 17 | if (headerMatch) { |
| 18 | const level = headerMatch[1].length; |
| 19 | const content = headerMatch[2]; |
| 20 | const headerTag = `h${level}`; |
| 21 | |
| 22 | // Close list if we were in one |
| 23 | if (inList) { |
| 24 | lineHtml += '</ul>'; |
| 25 | currentlyInList = false; |
| 26 | } |
| 27 | |
| 28 | lineHtml += `<${headerTag}>${parseInlineFormatting(content)}</${headerTag}>`; |
| 39 | 29 | } |
| 40 | | } |
| 41 | | if (count === 0 || count > 6) { |
| 42 | | return [null, list]; |
| 43 | | } |
| 44 | | const headerTag = `h${count}`; |
| 45 | | const headerHtml = wrap(markdown.substring(count + 1), headerTag); |
| 46 | | if (list) { |
| 47 | | return [`</ul>${headerHtml}`, false]; |
| 48 | | } else { |
| 49 | | return [headerHtml, false]; |
| 50 | | } |
| 51 | | } |
| 52 | | |
| 53 | | function parseLineItem(markdown, list) { |
| 54 | | if (markdown.startsWith('*')) { |
| 55 | | const innerHtml = wrap(parseText(markdown.substring(2), true), 'li'); |
| 56 | | if (list) { |
| 57 | | return [innerHtml, true]; |
| 58 | | } else { |
| 59 | | return [`<ul>${innerHtml}`, true]; |
| 30 | // Check for list items (* item) |
| 31 | else if (line.startsWith('* ')) { |
| 32 | const content = line.substring(2); |
| 33 | |
| 34 | // Start list if not already in one |
| 35 | if (!inList) { |
| 36 | lineHtml += '<ul>'; |
| 37 | currentlyInList = true; |
| 38 | } |
| 39 | |
| 40 | lineHtml += `<li>${parseInlineFormatting(content)}</li>`; |
| 60 | 41 | } |
| 42 | // Regular paragraph |
| 43 | else { |
| 44 | // Close list if we were in one |
| 45 | if (inList) { |
| 46 | lineHtml += '</ul>'; |
| 47 | currentlyInList = false; |
| 48 | } |
| 49 | |
| 50 | lineHtml += `<p>${parseInlineFormatting(line)}</p>`; |
| 51 | } |
| 52 | |
| 53 | html += lineHtml; |
| 54 | inList = currentlyInList; |
| 61 | 55 | } |
| 62 | | return [null, list]; |
| 63 | | } |
| 64 | | |
| 65 | | function parseParagraph(markdown, list) { |
| 66 | | if (!list) { |
| 67 | | return [parseText(markdown, false), false]; |
| 68 | | } else { |
| 69 | | return [`</ul>${parseText(markdown, false)}`, false]; |
| 70 | | } |
| 71 | | } |
| 72 | | |
| 73 | | function parseLine(markdown, list) { |
| 74 | | let [result, inListAfter] = parseHeader(markdown, list); |
| 75 | | if (result === null) { |
| 76 | | [result, inListAfter] = parseLineItem(markdown, list); |
| 77 | | } |
| 78 | | if (result === null) { |
| 79 | | [result, inListAfter] = parseParagraph(markdown, list); |
| 80 | | } |
| 81 | | if (result === null) { |
| 82 | | throw new Error('Remove this line and implement the function'); |
| 56 | |
| 57 | // Close any open list at the end |
| 58 | if (inList) { |
| 59 | html += '</ul>'; |
| 83 | 60 | } |
| 84 | | return [result, inListAfter]; |
| 61 | |
| 62 | return html; |
| 85 | 63 | } |
| 86 | 64 | |
| 87 | 65 | /** |
| 88 | | * @param {string} markdown |
| 89 | | * @returns {string} |
| 66 | * Parses inline formatting like bold (__text__) and italic (_text_) |
| 67 | * @param {string} text - The text to parse |
| 68 | * @returns {string} - The text with inline formatting converted to HTML |
| 90 | 69 | */ |
| 91 | | export function parse(markdown) { |
| 92 | | const lines = markdown.split('\n'); |
| 93 | | let result = ''; |
| 94 | | let list = false; |
| 95 | | for (let i = 0; i < lines.length; i++) { |
| 96 | | let [lineResult, newList] = parseLine(lines[i], list); |
| 97 | | result += lineResult; |
| 98 | | list = newList; |
| 99 | | } |
| 100 | | if (list) { |
| 101 | | return result + '</ul>'; |
| 102 | | } else { |
| 103 | | return result; |
| 104 | | } |
| 70 | function parseInlineFormatting(text) { |
| 71 | // Parse bold (__text__) - use non-greedy matching and word boundaries |
| 72 | text = text.replace(/__(.+?)__/g, '<strong>$1</strong>'); |
| 73 | // Parse italic (_text_) - use non-greedy matching and word boundaries |
| 74 | text = text.replace(/_(.+?)_/g, '<em>$1</em>'); |
| 75 | |
| 76 | return text; |
| 105 | 77 | } |