goodagent

Finished
1// Helper function to wrap text in HTML tags
12function wrap(text, tag) {
23 return `<${tag}>${text}</${tag}>`;
34}
45
6// Helper function to check if text starts with a specific HTML tag
57function isTag(text, tag) {
68 return text.startsWith(`<${tag}>`);
79}
810
9function parser(markdown, delimiter, tag) {
11// Generic parser for inline elements (bold, italic)
12function parseInlineElement(markdown, delimiter, tag) {
1013 const pattern = new RegExp(`${delimiter}(.+)${delimiter}`);
1114 const replacement = `<${tag}>$1</${tag}>`;
1215 return markdown.replace(pattern, replacement);
1316}
1417
15function parse__(markdown) {
16 return parser(markdown, '__', 'strong');
18// Parse bold text (__text__ -> <strong>text</strong>)
19function parseBold(markdown) {
20 return parseInlineElement(markdown, '__', 'strong');
1721}
1822
19function parse_(markdown) {
20 return parser(markdown, '_', 'em');
23// Parse italic text (_text_ -> <em>text</em>)
24function parseItalic(markdown) {
25 return parseInlineElement(markdown, '_', 'em');
2126}
2227
23function parseText(markdown, list) {
24 const parsedText = parse_(parse__(markdown));
25 if (list) {
26 return parsedText;
28// Parse text with inline formatting (bold, italic) and optionally wrap in paragraph tags
29function parseFormattedText(markdown, inList) {
30 // Apply inline formatting (bold, italic)
31 const formattedText = parseItalic(parseBold(markdown));
32
33 // If we're inside a list, don't wrap in paragraph tags
34 if (inList) {
35 return formattedText;
2736 } else {
28 return wrap(parsedText, 'p');
37 return wrap(formattedText, 'p');
2938 }
3039}
3140
32function parseHeader(markdown, list) {
33 let count = 0;
41// Parse header elements (# Header -> <h1>Header</h1>)
42function parseHeader(markdown, currentlyInList) {
43 // Count the number of # characters at the beginning
44 let hashCount = 0;
3445 for (let i = 0; i < markdown.length; i++) {
3546 if (markdown[i] === '#') {
36 count += 1;
47 hashCount += 1;
3748 } else {
3849 break;
3950 }
4051 }
41 if (count === 0 || count > 6) {
42 return [null, list];
52
53 // Headers must have 1-6 # characters
54 if (hashCount === 0 || hashCount > 6) {
55 return [null, currentlyInList];
4356 }
44 const headerTag = `h${count}`;
45 const headerHtml = wrap(markdown.substring(count + 1), headerTag);
46 if (list) {
57
58 // Create the appropriate header tag (h1, h2, etc.)
59 const headerTag = `h${hashCount}`;
60 const headerContent = markdown.substring(hashCount + 1);
61 const headerHtml = wrap(headerContent, headerTag);
62
63 // If we were in a list, close it before starting the header
64 if (currentlyInList) {
4765 return [`</ul>${headerHtml}`, false];
4866 } else {
4967 return [headerHtml, false];
5068 }
5169}
5270
53function parseLineItem(markdown, list) {
71// Parse list items (* Item -> <li>Item</li>)
72function parseListItem(markdown, currentlyInList) {
5473 if (markdown.startsWith('*')) {
55 const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
56 if (list) {
57 return [innerHtml, true];
74 // Extract the list item content (skip '* ' at the beginning)
75 const itemContent = markdown.substring(2);
76
77 // Format the content with inline formatting but don't wrap in paragraph tags
78 const formattedContent = parseFormattedText(itemContent, true);
79
80 // Wrap in list item tags
81 const listItemHtml = wrap(formattedContent, 'li');
82
83 // If we're already in a list, just add the list item
84 // Otherwise, start a new unordered list
85 if (currentlyInList) {
86 return [listItemHtml, true];
5887 } else {
59 return [`<ul>${innerHtml}`, true];
88 return [`<ul>${listItemHtml}`, true];
6089 }
6190 }
62 return [null, list];
91 return [null, currentlyInList];
6392}
6493
65function parseParagraph(markdown, list) {
66 if (!list) {
67 return [parseText(markdown, false), false];
94// Parse paragraph elements (regular text)
95function parseParagraph(markdown, currentlyInList) {
96 // If we're not in a list, wrap the text in paragraph tags
97 if (!currentlyInList) {
98 return [parseFormattedText(markdown, false), false];
6899 } else {
69 return [`</ul>${parseText(markdown, false)}`, false];
100 // If we were in a list, close it before starting a paragraph
101 return [`</ul>${parseFormattedText(markdown, false)}`, false];
70102 }
71103}
72104
73function parseLine(markdown, list) {
74 let [result, inListAfter] = parseHeader(markdown, list);
105// Parse a single line of markdown
106function parseLine(markdown, currentlyInList) {
107 // Try to parse as header
108 let [result, newListState] = parseHeader(markdown, currentlyInList);
109
110 // If not a header, try to parse as list item
75111 if (result === null) {
76 [result, inListAfter] = parseLineItem(markdown, list);
112 [result, newListState] = parseListItem(markdown, currentlyInList);
77113 }
114
115 // If not a list item, parse as paragraph
78116 if (result === null) {
79 [result, inListAfter] = parseParagraph(markdown, list);
117 [result, newListState] = parseParagraph(markdown, currentlyInList);
80118 }
119
120 // This should never happen with valid input
81121 if (result === null) {
82 throw new Error('Remove this line and implement the function');
122 throw new Error('Unable to parse line: ' + markdown);
83123 }
84 return [result, inListAfter];
124
125 return [result, newListState];
85126}
86127
87128/**
88 * @param {string} markdown
89 * @returns {string}
129 * Parse markdown text and convert it to HTML
130 * @param {string} markdown - The markdown text to parse
131 * @returns {string} - The resulting HTML
90132 */
91133export function parse(markdown) {
134 // Split the markdown into individual lines
92135 const lines = markdown.split('\n');
93 let result = '';
94 let list = false;
136 let htmlResult = '';
137 let inList = false;
138
139 // Process each line
95140 for (let i = 0; i < lines.length; i++) {
96 let [lineResult, newList] = parseLine(lines[i], list);
97 result += lineResult;
98 list = newList;
141 let [lineHtml, newListState] = parseLine(lines[i], inList);
142 htmlResult += lineHtml;
143 inList = newListState;
99144 }
100 if (list) {
101 return result + '</ul>';
145
146 // If we're still in a list at the end, close it
147 if (inList) {
148 return htmlResult + '</ul>';
102149 } else {
103 return result;
150 return htmlResult;
104151 }
105152}
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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