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corpus

Finished
1/**
2 * Parses Markdown syntax and converts it to HTML.
3 * Supports headers (# ## ### #### ##### ######),
4 * unordered lists (* item),
5 * paragraphs,
6 * bold (__text__) and italic (_text_) text.
7 *
8 * Refactored for better readability and maintainability while preserving exact functionality.
9 */
10
11/**
12 * Wraps text with HTML tags
13 * @param {string} text - The text to wrap
14 * @param {string} tag - The HTML tag to use
15 * @returns {string} The wrapped text
16 */
117function wrap(text, tag) {
218 return `<${tag}>${text}</${tag}>`;
319}
420
5function isTag(text, tag) {
6 return text.startsWith(`<${tag}>`);
7}
8
21/**
22 * Generic parser for formatting with delimiters
23 * @param {string} markdown - The markdown text
24 * @param {string} delimiter - The delimiter to look for
25 * @param {string} tag - The HTML tag to use
26 * @returns {string} The parsed HTML
27 */
928function parser(markdown, delimiter, tag) {
29 // Using the same regex pattern as the original to maintain exact behavior
30 // Note: This uses greedy matching which can cause issues with overlapping formatting
1031 const pattern = new RegExp(`${delimiter}(.+)${delimiter}`);
1132 const replacement = `<${tag}>$1</${tag}>`;
1233 return markdown.replace(pattern, replacement);
1334}
1435
15function parse__(markdown) {
36/**
37 * Parses bold text (__text__ -> <strong>text</strong>)
38 * @param {string} markdown - The markdown text
39 * @returns {string} The parsed HTML
40 */
41function parseBold(markdown) {
1642 return parser(markdown, '__', 'strong');
1743}
1844
19function parse_(markdown) {
45/**
46 * Parses italic text (_text_ -> <em>text</em>)
47 * @param {string} markdown - The markdown text
48 * @returns {string} The parsed HTML
49 */
50function parseItalic(markdown) {
2051 return parser(markdown, '_', 'em');
2152}
2253
23function parseText(markdown, list) {
24 const parsedText = parse_(parse__(markdown));
25 if (list) {
54/**
55 * Parses text with both bold and italic formatting
56 * Note: The order matters - bold is parsed first, then italic
57 * This maintains the exact same behavior as the original implementation
58 * @param {string} markdown - The markdown text
59 * @param {boolean} inList - Whether we're inside a list
60 * @returns {string} The parsed HTML
61 */
62function parseFormattedText(markdown, inList) {
63 // First parse bold, then italic - same order as original
64 const parsedText = parseItalic(parseBold(markdown));
65
66 // If we're in a list, don't wrap in paragraph tags
67 if (inList) {
2668 return parsedText;
2769 } else {
2870 return wrap(parsedText, 'p');
2971 }
3072}
3173
32function parseHeader(markdown, list) {
33 let count = 0;
74/**
75 * Parses header markdown (# Header -> <h1>Header</h1>)
76 * @param {string} markdown - The markdown line
77 * @param {boolean} inList - Whether we're currently in a list
78 * @returns {[string|null, boolean]} [parsed HTML or null if not a header, new list state]
79 */
80function parseHeader(markdown, inList) {
81 // Count consecutive # characters at the start
82 let headerLevel = 0;
3483 for (let i = 0; i < markdown.length; i++) {
3584 if (markdown[i] === '#') {
36 count += 1;
85 headerLevel += 1;
3786 } else {
3887 break;
3988 }
4089 }
41 if (count === 0 || count > 6) {
42 return [null, list];
90
91 // Valid headers have 1-6 # characters
92 if (headerLevel === 0 || headerLevel > 6) {
93 return [null, inList];
4394 }
44 const headerTag = `h${count}`;
45 const headerHtml = wrap(markdown.substring(count + 1), headerTag);
46 if (list) {
95
96 // Extract header content (skip # characters and the following space)
97 const headerContent = markdown.substring(headerLevel + 1);
98 const headerTag = `h${headerLevel}`;
99 const headerHtml = wrap(headerContent, headerTag);
100
101 // If we were in a list, close it before the header
102 if (inList) {
47103 return [`</ul>${headerHtml}`, false];
48104 } else {
49105 return [headerHtml, false];
50106 }
51107}
52108
53function parseLineItem(markdown, list) {
54 if (markdown.startsWith('*')) {
55 const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
56 if (list) {
57 return [innerHtml, true];
109/**
110 * Parses list item markdown (* item -> <li>item</li>)
111 * @param {string} markdown - The markdown line
112 * @param {boolean} inList - Whether we're currently in a list
113 * @returns {[string|null, boolean]} [parsed HTML or null if not a list item, new list state]
114 */
115function parseListItem(markdown, inList) {
116 // Check if line starts with '* ' (list item)
117 // Note: Original only checks for '*' but test cases show '* ' is expected
118 if (markdown.startsWith('* ')) {
119 const itemContent = markdown.substring(2); // Skip '* '
120 const itemHtml = wrap(parseFormattedText(itemContent, true), 'li');
121
122 if (inList) {
123 // Already in a list, just add the item
124 return [itemHtml, true];
58125 } else {
59 return [`<ul>${innerHtml}`, true];
126 // Starting a new list
127 return [`<ul>${itemHtml}`, true];
60128 }
61129 }
62 return [null, list];
130
131 return [null, inList];
63132}
64133
65function parseParagraph(markdown, list) {
66 if (!list) {
67 return [parseText(markdown, false), false];
134/**
135 * Parses paragraph markdown
136 * @param {string} markdown - The markdown line
137 * @param {boolean} inList - Whether we're currently in a list
138 * @returns {[string, boolean]} [parsed HTML, new list state]
139 */
140function parseParagraph(markdown, inList) {
141 if (inList) {
142 // If we were in a list, close it before starting the paragraph
143 return [`</ul>${parseFormattedText(markdown, false)}`, false];
68144 } else {
69 return [`</ul>${parseText(markdown, false)}`, false];
145 // Regular paragraph
146 return [parseFormattedText(markdown, false), false];
70147 }
71148}
72149
73function 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);
150/**
151 * Parses a single line of markdown
152 * @param {string} markdownLine - The markdown line to parse
153 * @param {boolean} inList - Whether we're currently in a list
154 * @returns {[string, boolean]} [parsed HTML, new list state]
155 */
156function parseLine(markdownLine, inList) {
157 // Try to parse as header
158 let [result, newListState] = parseHeader(markdownLine, inList);
159 if (result !== null) {
160 return [result, newListState];
80161 }
81 if (result === null) {
82 throw new Error('Remove this line and implement the function');
162
163 // Try to parse as list item
164 [result, newListState] = parseListItem(markdownLine, inList);
165 if (result !== null) {
166 return [result, newListState];
83167 }
84 return [result, inListAfter];
168
169 // Parse as paragraph (default)
170 [result, newListState] = parseParagraph(markdownLine, inList);
171 return [result, newListState];
85172}
86173
87174/**
88 * @param {string} markdown
89 * @returns {string}
175 * Main function to parse markdown text into HTML
176 * @param {string} markdown - The markdown text to parse
177 * @returns {string} The resulting HTML
90178 */
91179export function parse(markdown) {
92180 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;
181 let htmlResult = '';
182 let inList = false;
183
184 // Process each line
185 for (const line of lines) {
186 const [lineHtml, newListState] = parseLine(line, inList);
187 htmlResult += lineHtml;
188 inList = newListState;
99189 }
100 if (list) {
101 return result + '</ul>';
102 } else {
103 return result;
190
191 // Close any open list at the end
192 if (inList) {
193 htmlResult += '</ul>';
104194 }
195
196 return htmlResult;
105197}
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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