fishlium

Finished
1// Helper functions for wrapping text in HTML tags
12function wrap(text, tag) {
23 return `<${tag}>${text}</${tag}>`;
34}
45
6// Helper function to check if text starts with a specific tag
57function isTag(text, tag) {
68 return text.startsWith(`<${tag}>`);
79}
810
11// Generic parser for inline elements (bold, italic)
912function parser(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) {
18// Parse bold text (__text__ -> <strong>text</strong>)
19function parseBold(markdown) {
1620 return parser(markdown, '__', 'strong');
1721}
1822
19function parse_(markdown) {
23// Parse italic text (_text_ -> <em>text</em>)
24function parseItalic(markdown) {
2025 return parser(markdown, '_', 'em');
2126}
2227
23function parseText(markdown, list) {
24 const parsedText = parse_(parse__(markdown));
25 if (list) {
28// Parse text with inline formatting (bold, italic)
29function parseInlineFormatting(markdown) {
30 return parseItalic(parseBold(markdown));
31}
32
33// Parse regular text, wrapping in paragraph tags if not in a list
34function parseText(markdown, inList) {
35 const parsedText = parseInlineFormatting(markdown);
36 if (inList) {
2637 return parsedText;
2738 } else {
2839 return wrap(parsedText, 'p');
2940 }
3041}
3142
32function parseHeader(markdown, list) {
33 let count = 0;
43// Parse header markdown (# Header -> <h1>Header</h1>)
44function parseHeader(markdown, inList) {
45 // Count consecutive # characters at the beginning
46 let hashCount = 0;
3447 for (let i = 0; i < markdown.length; i++) {
3548 if (markdown[i] === '#') {
36 count += 1;
49 hashCount += 1;
3750 } else {
3851 break;
3952 }
4053 }
41 if (count === 0 || count > 6) {
42 return [null, list];
54
55 // Headers must have 1-6 # characters
56 if (hashCount === 0 || hashCount > 6) {
57 return [null, inList];
4358 }
44 const headerTag = `h${count}`;
45 const headerHtml = wrap(markdown.substring(count + 1), headerTag);
46 if (list) {
59
60 // Create the appropriate header tag (h1-h6)
61 const headerTag = `h${hashCount}`;
62 const headerContent = markdown.substring(hashCount + 1);
63 const headerHtml = wrap(headerContent, headerTag);
64
65 // If we were in a list, close it before the header
66 if (inList) {
4767 return [`</ul>${headerHtml}`, false];
4868 } else {
4969 return [headerHtml, false];
5070 }
5171}
5272
53function parseLineItem(markdown, list) {
73// Parse list items (* item -> <li>item</li>)
74function parseLineItem(markdown, inList) {
5475 if (markdown.startsWith('*')) {
55 const innerHtml = wrap(parseText(markdown.substring(2), true), 'li');
56 if (list) {
57 return [innerHtml, true];
76 const itemContent = markdown.substring(2); // Skip '* ' prefix
77 const formattedContent = parseText(itemContent, true); // Parse inline formatting
78 const listItemHtml = wrap(formattedContent, 'li');
79
80 // If we're already in a list, just add the list item
81 // Otherwise, start a new unordered list
82 if (inList) {
83 return [listItemHtml, true];
5884 } else {
59 return [`<ul>${innerHtml}`, true];
85 return [`<ul>${listItemHtml}`, true];
6086 }
6187 }
62 return [null, list];
88 return [null, inList];
6389}
6490
65function parseParagraph(markdown, list) {
66 if (!list) {
67 return [parseText(markdown, false), false];
91// Parse regular paragraphs (text -> <p>text</p>)
92function parseParagraph(markdown, inList) {
93 const paragraphHtml = parseText(markdown, false);
94
95 // If we were in a list, close it before the paragraph
96 if (inList) {
97 return [`</ul>${paragraphHtml}`, false];
6898 } else {
69 return [`</ul>${parseText(markdown, false)}`, false];
99 return [paragraphHtml, false];
70100 }
71101}
72102
73function parseLine(markdown, list) {
74 let [result, inListAfter] = parseHeader(markdown, list);
103// Parse a single line of markdown, determining its type and converting to HTML
104function parseLine(markdown, inList) {
105 // Try to parse as header first
106 let [result, newInList] = parseHeader(markdown, inList);
107
108 // If not a header, try to parse as list item
75109 if (result === null) {
76 [result, inListAfter] = parseLineItem(markdown, list);
110 [result, newInList] = parseLineItem(markdown, inList);
77111 }
112
113 // If not a list item, parse as paragraph
78114 if (result === null) {
79 [result, inListAfter] = parseParagraph(markdown, list);
115 [result, newInList] = parseParagraph(markdown, inList);
80116 }
117
118 // This should never happen as one of the parsers should always succeed
81119 if (result === null) {
82 throw new Error('Remove this line and implement the function');
120 throw new Error('Unable to parse markdown line');
83121 }
84 return [result, inListAfter];
122
123 return [result, newInList];
85124}
86125
87126/**
88 * @param {string} markdown
89 * @returns {string}
127 * Parse markdown text and convert it to HTML
128 * @param {string} markdown - The markdown text to parse
129 * @returns {string} The equivalent HTML
90130 */
91131export function parse(markdown) {
92132 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;
133 let htmlResult = '';
134 let inList = false;
135
136 // Process each line of markdown
137 for (const line of lines) {
138 const [lineHtml, newInListState] = parseLine(line, inList);
139 htmlResult += lineHtml;
140 inList = newInListState;
99141 }
100 if (list) {
101 return result + '</ul>';
142
143 // If we're still in a list at the end, close it
144 if (inList) {
145 return htmlResult + '</ul>';
102146 } else {
103 return result;
147 return htmlResult;
104148 }
105149}
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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