goodagent

Finished
1// Helper function to wrap text in HTML tags
12function wrap(text, tag) {
23 return `<${tag}>${text}</${tag}>`;
34}
45
5function isTag(text, tag) {
6 return text.startsWith(`<${tag}>`);
7}
8
9function parser(markdown, delimiter, tag) {
10 const pattern = new RegExp(`${delimiter}(.+)${delimiter}`);
11 const replacement = `<${tag}>$1</${tag}>`;
6// Parse bold text (double underscores)
7function parseBold(markdown) {
8 const pattern = new RegExp(`__([^_]+)__`);
9 const replacement = `<strong>$1</strong>`;
1210 return markdown.replace(pattern, replacement);
1311}
1412
15function parse__(markdown) {
16 return parser(markdown, '__', 'strong');
13// Parse italic text (single underscores)
14function parseItalic(markdown) {
15 const pattern = new RegExp(`_([^_]+)_`);
16 const replacement = `<em>$1</em>`;
17 return markdown.replace(pattern, replacement);
1718}
1819
19function parse_(markdown) {
20 return parser(markdown, '_', 'em');
20// Parse inline formatting (bold and italic)
21function parseInlineFormatting(markdown) {
22 return parseItalic(parseBold(markdown));
2123}
2224
23function parseText(markdown, list) {
24 const parsedText = parse_(parse__(markdown));
25 if (list) {
25// Parse text with appropriate wrapper tags
26function parseText(markdown, inList) {
27 const parsedText = parseInlineFormatting(markdown);
28 if (inList) {
2629 return parsedText;
2730 } else {
2831 return wrap(parsedText, 'p');
2932 }
3033}
3134
32function parseHeader(markdown, list) {
35// Parse header elements (#, ##, ###, etc.)
36function parseHeader(markdown, inList) {
3337 let count = 0;
3438 for (let i = 0; i < markdown.length; i++) {
3539 if (markdown[i] === '#') {
3842 break;
3943 }
4044 }
45
46 // Headers must be between 1 and 6 hash characters
4147 if (count === 0 || count > 6) {
42 return [null, list];
48 return [null, inList];
4349 }
50
4451 const headerTag = `h${count}`;
45 const headerHtml = wrap(markdown.substring(count + 1), headerTag);
46 if (list) {
52 const headerContent = markdown.substring(count + 1);
53 const headerHtml = wrap(headerContent, headerTag);
54
55 // Close any open list before starting a header
56 if (inList) {
4757 return [`</ul>${headerHtml}`, false];
4858 } else {
4959 return [headerHtml, false];
5060 }
5161}
5262
53function parseLineItem(markdown, list) {
63// Parse list items (* item)
64function parseListItem(markdown, inList) {
5465 if (markdown.startsWith('*')) {
55 const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
56 if (list) {
57 return [innerHtml, true];
66 const listItemContent = markdown.substring(2);
67 const listItemHtml = wrap(parseText(listItemContent, true), 'li');
68
69 if (inList) {
70 // Continue existing list
71 return [listItemHtml, true];
5872 } else {
59 return [`<ul>${innerHtml}`, true];
73 // Start new list
74 return [`<ul>${listItemHtml}`, true];
6075 }
6176 }
62 return [null, list];
77 return [null, inList];
6378}
6479
65function parseParagraph(markdown, list) {
66 if (!list) {
67 return [parseText(markdown, false), false];
68 } else {
80// Parse paragraph elements
81function parseParagraph(markdown, inList) {
82 if (inList) {
83 // Close list before starting paragraph
6984 return [`</ul>${parseText(markdown, false)}`, false];
85 } else {
86 return [parseText(markdown, false), false];
7087 }
7188}
7289
73function parseLine(markdown, list) {
74 let [result, inListAfter] = parseHeader(markdown, list);
75 if (result === null) {
76 [result, inListAfter] = parseLineItem(markdown, list);
90// Parse a single line of markdown
91function parseLine(markdown, inList) {
92 // Try to parse as header
93 let [result, newListState] = parseHeader(markdown, inList);
94 if (result !== null) {
95 return [result, newListState];
7796 }
78 if (result === null) {
79 [result, inListAfter] = parseParagraph(markdown, list);
97
98 // Try to parse as list item
99 [result, newListState] = parseListItem(markdown, inList);
100 if (result !== null) {
101 return [result, newListState];
80102 }
81 if (result === null) {
82 throw new Error('Remove this line and implement the function');
103
104 // Default to paragraph
105 [result, newListState] = parseParagraph(markdown, inList);
106 if (result !== null) {
107 return [result, newListState];
83108 }
84 return [result, inListAfter];
109
110 // This should never happen with valid input
111 throw new Error('Unable to parse line');
85112}
86113
87114/**
88 * @param {string} markdown
89 * @returns {string}
115 * Parse Markdown text and convert it to HTML
116 * @param {string} markdown - The Markdown text to parse
117 * @returns {string} - The resulting HTML
90118 */
91119export function parse(markdown) {
92120 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;
121 let html = '';
122 let inList = false;
123
124 for (const line of lines) {
125 const [lineHtml, newListState] = parseLine(line, inList);
126 html += lineHtml;
127 inList = newListState;
99128 }
100 if (list) {
101 return result + '</ul>';
102 } else {
103 return result;
129
130 // Close any open list at the end
131 if (inList) {
132 html += '</ul>';
104133 }
134
135 return html;
105136}
Test NameStatus
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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