fortitude

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 (surrounded by double underscores)
7function parseBold(markdown) {
8 const pattern = /__(.+)__/g;
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 (surrounded by single underscores)
14function parseItalic(markdown) {
15 const pattern = /_(.+)_/g;
16 const replacement = '<em>$1</em>';
17 return markdown.replace(pattern, replacement);
1718}
1819
19function parse_(markdown) {
20 return parser(markdown, '_', 'em');
20// Parse inline formatting (bold and italic)
21function parseInlineFormatting(markdown) {
22 return parseItalic(parseBold(markdown));
2123}
2224
23function parseText(markdown, list) {
24 const parsedText = parse_(parse__(markdown));
25 if (list) {
25// Parse text with appropriate paragraph wrapping
26function parseText(markdown, inList = false) {
27 const parsedText = parseInlineFormatting(markdown);
28 if (inList) {
2629 return parsedText;
2730 } else {
2831 return wrap(parsedText, 'p');
2932 }
3033}
3134
32function parseHeader(markdown, list) {
35// Parse header markdown (# ## ### etc.)
36function parseHeader(markdown, inList) {
3337 let count = 0;
3438 for (let i = 0; i < markdown.length; i++) {
3539 if (markdown[i] === '#') {
3842 break;
3943 }
4044 }
45
46 // Valid headers have 1-6 # characters
4147 if (count === 0 || count > 6) {
42 return [null, list];
48 return { result: null, inList };
4349 }
50
4451 const headerTag = `h${count}`;
45 const headerHtml = wrap(markdown.substring(count + 1), headerTag);
46 if (list) {
47 return [`</ul>${headerHtml}`, false];
52 const headerContent = markdown.substring(count + 1);
53 const headerHtml = wrap(headerContent, headerTag);
54
55 // If we were in a list, close it before starting the header
56 if (inList) {
57 return { result: `</ul>${headerHtml}`, inList: false };
4858 } else {
49 return [headerHtml, false];
59 return { result: headerHtml, inList: false };
5060 }
5161}
5262
53function parseLineItem(markdown, list) {
63// Parse list items (starting with *)
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); // Skip '* ' prefix
67 const innerHtml = wrap(parseText(listItemContent, true), 'li');
68
69 if (inList) {
70 // Continue existing list
71 return { result: innerHtml, inList: true };
5872 } else {
59 return [`<ul>${innerHtml}`, true];
73 // Start new list
74 return { result: `<ul>${innerHtml}`, inList: true };
6075 }
6176 }
62 return [null, list];
77
78 return { result: null, inList };
6379}
6480
65function parseParagraph(markdown, list) {
66 if (!list) {
67 return [parseText(markdown, false), false];
81// Parse paragraph text
82function parseParagraph(markdown, inList) {
83 if (inList) {
84 // Close list before starting paragraph
85 return { result: `</ul>${parseText(markdown, false)}`, inList: false };
6886 } else {
69 return [`</ul>${parseText(markdown, false)}`, false];
87 // Regular paragraph
88 return { result: parseText(markdown, false), inList: false };
7089 }
7190}
7291
73function parseLine(markdown, list) {
74 let [result, inListAfter] = parseHeader(markdown, list);
75 if (result === null) {
76 [result, inListAfter] = parseLineItem(markdown, list);
92// Parse a single line of markdown
93function parseLine(markdown, inList) {
94 // Try parsing as header
95 let parseResult = parseHeader(markdown, inList);
96 if (parseResult.result !== null) {
97 return parseResult;
7798 }
78 if (result === null) {
79 [result, inListAfter] = parseParagraph(markdown, list);
99
100 // Try parsing as list item
101 parseResult = parseListItem(markdown, inList);
102 if (parseResult.result !== null) {
103 return parseResult;
80104 }
81 if (result === null) {
82 throw new Error('Remove this line and implement the function');
83 }
84 return [result, inListAfter];
105
106 // Default to paragraph
107 return parseParagraph(markdown, inList);
85108}
86109
87110/**
88 * @param {string} markdown
89 * @returns {string}
111 * Parse markdown text and convert it to HTML
112 * @param {string} markdown - The markdown text to parse
113 * @returns {string} - The resulting HTML
90114 */
91115export function parse(markdown) {
92116 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;
117 let html = '';
118 let inList = false;
119
120 for (const line of lines) {
121 const parseResult = parseLine(line, inList);
122 html += parseResult.result;
123 inList = parseResult.inList;
99124 }
100 if (list) {
101 return result + '</ul>';
102 } else {
103 return result;
125
126 // Close any open list at the end
127 if (inList) {
128 html += '</ul>';
104129 }
130
131 return html;
105132}
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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