Kratos

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 (__text__ -> <strong>text</strong>)
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');
17}
18
19function parse_(markdown) {
20 return parser(markdown, '_', 'em');
13// Parse italic text (_text_ -> <em>text</em>)
14function parseItalic(markdown) {
15 const pattern = new RegExp('_(.+)_');
16 const replacement = '<em>$1</em>';
17 return markdown.replace(pattern, replacement);
2118}
2219
23function parseText(markdown, list) {
24 const parsedText = parse_(parse__(markdown));
25 if (list) {
26 return parsedText;
27 } else {
28 return wrap(parsedText, 'p');
29 }
20// Parse inline formatting (bold and italic)
21function parseInlineFormatting(markdown) {
22 return parseItalic(parseBold(markdown));
3023}
3124
32function parseHeader(markdown, list) {
33 let count = 0;
25// Parse header markdown (# Header -> <h1>Header</h1>)
26function parseHeader(markdown, currentlyInList) {
27 // Count consecutive # characters at the start of the line
28 let headerLevel = 0;
3429 for (let i = 0; i < markdown.length; i++) {
3530 if (markdown[i] === '#') {
36 count += 1;
31 headerLevel += 1;
3732 } else {
3833 break;
3934 }
4035 }
41 if (count === 0 || count > 6) {
42 return [null, list];
36
37 // Valid headers are 1-6 levels
38 if (headerLevel === 0 || headerLevel > 6) {
39 return [null, currentlyInList];
4340 }
44 const headerTag = `h${count}`;
45 const headerHtml = wrap(markdown.substring(count + 1), headerTag);
46 if (list) {
41
42 // Extract header text (skip # characters and the following space)
43 const headerText = markdown.substring(headerLevel + 1);
44 const headerTag = `h${headerLevel}`;
45 const headerHtml = wrap(headerText, headerTag);
46
47 // If we were in a list, close it before starting the header
48 if (currentlyInList) {
4749 return [`</ul>${headerHtml}`, false];
4850 } else {
4951 return [headerHtml, false];
5052 }
5153}
5254
53function parseLineItem(markdown, list) {
55// Parse list items (* item -> <li>item</li>)
56function parseListItem(markdown, currentlyInList) {
5457 if (markdown.startsWith('*')) {
55 const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
56 if (list) {
57 return [innerHtml, true];
58 // Extract list item text (skip "* " prefix)
59 const itemText = markdown.substring(2);
60 // Parse inline formatting in the list item
61 const formattedText = parseInlineFormatting(itemText);
62 const listItemHtml = wrap(formattedText, 'li');
63
64 // If we're already in a list, just add the list item
65 // Otherwise, start a new list
66 if (currentlyInList) {
67 return [listItemHtml, true];
5868 } else {
59 return [`<ul>${innerHtml}`, true];
69 return [`<ul>${listItemHtml}`, true];
6070 }
6171 }
62 return [null, list];
72 return [null, currentlyInList];
6373}
6474
65function parseParagraph(markdown, list) {
66 if (!list) {
67 return [parseText(markdown, false), false];
75// Parse paragraph text
76function parseParagraph(markdown, currentlyInList) {
77 // Parse inline formatting in the paragraph
78 const formattedText = parseInlineFormatting(markdown);
79
80 // If we were in a list, close it before starting the paragraph
81 if (currentlyInList) {
82 return [`</ul>${wrap(formattedText, 'p')}`, false];
6883 } else {
69 return [`</ul>${parseText(markdown, false)}`, false];
84 return [wrap(formattedText, 'p'), false];
7085 }
7186}
7287
73function parseLine(markdown, list) {
74 let [result, inListAfter] = parseHeader(markdown, list);
88// Parse a single line of markdown
89function parseLine(markdown, currentlyInList) {
90 // Try parsing as header first
91 let [result, newListState] = parseHeader(markdown, currentlyInList);
92
93 // If not a header, try parsing as list item
7594 if (result === null) {
76 [result, inListAfter] = parseLineItem(markdown, list);
95 [result, newListState] = parseListItem(markdown, currentlyInList);
7796 }
97
98 // If not a list item, parse as paragraph
7899 if (result === null) {
79 [result, inListAfter] = parseParagraph(markdown, list);
100 [result, newListState] = parseParagraph(markdown, currentlyInList);
80101 }
102
103 // This should never happen with valid input
81104 if (result === null) {
82 throw new Error('Remove this line and implement the function');
105 throw new Error('Unable to parse line: ' + markdown);
83106 }
84 return [result, inListAfter];
107
108 return [result, newListState];
85109}
86110
87111/**
88 * @param {string} markdown
89 * @returns {string}
112 * Parse markdown text and convert it to HTML
113 * @param {string} markdown - The markdown text to parse
114 * @returns {string} - The resulting HTML
90115 */
91116export function parse(markdown) {
92117 const lines = markdown.split('\n');
93 let result = '';
94 let list = false;
118 let htmlResult = '';
119 let currentlyInList = false;
120
121 // Process each line of markdown
95122 for (let i = 0; i < lines.length; i++) {
96 let [lineResult, newList] = parseLine(lines[i], list);
97 result += lineResult;
98 list = newList;
123 let [lineHtml, newListState] = parseLine(lines[i], currentlyInList);
124 htmlResult += lineHtml;
125 currentlyInList = newListState;
99126 }
100 if (list) {
101 return result + '</ul>';
102 } else {
103 return result;
127
128 // If we ended while still in a list, close the list
129 if (currentlyInList) {
130 htmlResult += '</ul>';
104131 }
132
133 return htmlResult;
105134}
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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