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export type MarkdownRenderOptions = {
baseUrl: string;
resolveHref?: (rawHref: string, baseUrl: string) => string;
resolveImageSrc?: (rawSrc: string, baseUrl: string) => string;
onLinkCreated?: (link: HTMLAnchorElement, rawHref: string) => void;
};
type NormalizedRenderOptions = Required<MarkdownRenderOptions>;
export function renderMarkdown(
markdown: string,
container: RenderTarget,
baseUrlOrOptions: string | MarkdownRenderOptions
): void {
const options = normalizeOptions(baseUrlOrOptions);
container.replaceChildren();
const lines = markdown.replace(/\r\n/g, '\n').split('\n');
let index = 0;
let currentParagraph: string[] = [];
let currentList: { type: 'ul' | 'ol'; items: string[] } | null = null;
let currentBlockquote: string[] = [];
const flushParagraph = () => {
if (currentParagraph.length === 0) return;
const p = document.createElement('p');
appendInline(p, currentParagraph.join(' '), options);
container.appendChild(p);
currentParagraph = [];
};
const flushList = () => {
if (!currentList) return;
const list = document.createElement(currentList.type);
currentList.items.forEach((item) => {
const li = document.createElement('li');
appendInline(li, item, options);
list.appendChild(li);
});
container.appendChild(list);
currentList = null;
};
const flushBlockquote = () => {
if (currentBlockquote.length === 0) return;
const block = document.createElement('blockquote');
appendInline(block, currentBlockquote.join(' '), options);
container.appendChild(block);
currentBlockquote = [];
};
while (index < lines.length) {
const line = lines[index];
if (line.trim().startsWith('```')) {
flushParagraph();
flushList();
flushBlockquote();
const codeLines: string[] = [];
index += 1;
while (index < lines.length && !lines[index].trim().startsWith('```')) {
codeLines.push(lines[index]);
index += 1;
}
const pre = document.createElement('pre');
const code = document.createElement('code');
code.textContent = codeLines.join('\n');
pre.appendChild(code);
container.appendChild(pre);
index += 1;
continue;
}
if (/^#{1,6}\s+/.test(line)) {
flushParagraph();
flushList();
flushBlockquote();
const match = line.match(/^(#{1,6})\s+(.*)$/);
if (match) {
const level = match[1].length;
const heading = document.createElement(`h${level}`);
appendInline(heading, match[2].trim(), options);
container.appendChild(heading);
}
index += 1;
continue;
}
if (/^\s*([-*])\s+/.test(line)) {
flushParagraph();
flushBlockquote();
const item = line.replace(/^\s*[-*]\s+/, '').trim();
if (!currentList || currentList.type !== 'ul') {
flushList();
currentList = { type: 'ul', items: [] };
}
currentList.items.push(item);
index += 1;
continue;
}
if (/^\s*\d+\.\s+/.test(line)) {
flushParagraph();
flushBlockquote();
const item = line.replace(/^\s*\d+\.\s+/, '').trim();
if (!currentList || currentList.type !== 'ol') {
flushList();
currentList = { type: 'ol', items: [] };
}
currentList.items.push(item);
index += 1;
continue;
}
if (/^\s*>\s?/.test(line)) {
flushParagraph();
flushList();
const text = line.replace(/^\s*>\s?/, '').trim();
currentBlockquote.push(text);
index += 1;
continue;
}
if (/^\s*(-{3,}|\*{3,})\s*$/.test(line)) {
flushParagraph();
flushList();
flushBlockquote();
container.appendChild(document.createElement('hr'));
index += 1;
continue;
}
if (line.trim() === '') {
flushParagraph();
flushList();
flushBlockquote();
index += 1;
continue;
}
currentParagraph.push(line.trim());
index += 1;
}
flushParagraph();
flushList();
flushBlockquote();
}
function normalizeOptions(baseUrlOrOptions: string | MarkdownRenderOptions): NormalizedRenderOptions {
if (typeof baseUrlOrOptions === 'string') {
return {
baseUrl: baseUrlOrOptions,
resolveHref: resolveMarkdownHref,
resolveImageSrc: resolveRelativeHref,
onLinkCreated: () => undefined,
};
}
return {
baseUrl: baseUrlOrOptions.baseUrl,
resolveHref: baseUrlOrOptions.resolveHref ?? resolveMarkdownHref,
resolveImageSrc: baseUrlOrOptions.resolveImageSrc ?? resolveRelativeHref,
onLinkCreated: baseUrlOrOptions.onLinkCreated ?? (() => undefined),
};
}
function appendInline(parent: HTMLElement, text: string, options: NormalizedRenderOptions): void {
const parts = text.split('`');
parts.forEach((segment, idx) => {
if (idx % 2 === 1) {
const code = document.createElement('code');
code.textContent = segment;
parent.appendChild(code);
return;
}
appendLinksAndEmphasis(parent, segment, options);
});
}
function appendLinksAndEmphasis(parent: HTMLElement, text: string, options: NormalizedRenderOptions): void {
const tokenRegex = /!\[([^\]]*)\]\(([^)]+)\)|\[([^\]]+)\]\(([^)]+)\)/g;
let lastIndex = 0;
let match: RegExpExecArray | null = null;
while ((match = tokenRegex.exec(text)) !== null) {
const prefix = text.slice(lastIndex, match.index);
appendEmphasis(parent, prefix);
const isImage = Boolean(match[1]);
if (isImage) {
const img = document.createElement('img');
const rawSrc = match[2].trim();
img.src = options.resolveImageSrc(rawSrc, options.baseUrl);
img.alt = match[1].trim();
parent.appendChild(img);
} else {
const link = document.createElement('a');
const rawHref = match[4].trim();
link.href = options.resolveHref(rawHref, options.baseUrl);
link.textContent = match[3].trim();
options.onLinkCreated(link, rawHref);
parent.appendChild(link);
}
lastIndex = match.index + match[0].length;
}
appendEmphasis(parent, text.slice(lastIndex));
}
function appendEmphasis(parent: HTMLElement, text: string): void {
let remaining = text;
const strongRegex = /\*\*([^*]+)\*\*/;
const emRegex = /\*([^*]+)\*/;
while (remaining.length > 0) {
const strongMatch = remaining.match(strongRegex);
const emMatch = remaining.match(emRegex);
if (!strongMatch && !emMatch) {
parent.appendChild(document.createTextNode(remaining));
return;
}
const strongIndex = strongMatch ? strongMatch.index ?? -1 : -1;
const emIndex = emMatch ? emMatch.index ?? -1 : -1;
let nextIsStrong = false;
if (strongIndex >= 0 && (emIndex === -1 || strongIndex <= emIndex)) {
nextIsStrong = true;
}
const nextMatch = nextIsStrong ? strongMatch : emMatch;
if (!nextMatch || nextMatch.index === undefined) {
parent.appendChild(document.createTextNode(remaining));
return;
}
if (nextMatch.index > 0) {
parent.appendChild(document.createTextNode(remaining.slice(0, nextMatch.index)));
}
const element = document.createElement(nextIsStrong ? 'strong' : 'em');
element.textContent = nextMatch[1];
parent.appendChild(element);
remaining = remaining.slice(nextMatch.index + nextMatch[0].length);
}
}
export function resolveRelativeHref(rawHref: string, baseUrl: string): string {
if (!rawHref) return rawHref;
if (rawHref.startsWith('#')) return rawHref;
try {
return new URL(rawHref, baseUrl).href;
} catch {
return rawHref;
}
}
export function resolveMarkdownHref(rawHref: string, baseUrl: string): string {
if (!rawHref) return rawHref;
if (rawHref.startsWith('#')) return rawHref;
try {
const resolved = new URL(rawHref, baseUrl).href;
const viewerUrl = new URL(window.location.href);
viewerUrl.search = '';
viewerUrl.hash = '';
viewerUrl.searchParams.set('url', resolved);
return viewerUrl.toString();
} catch {
return rawHref;
}
}
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