226 lines
7.4 KiB
JavaScript
226 lines
7.4 KiB
JavaScript
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import { h } from "./dom.js";
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const fence = /^\s*(```|~~~)/;
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const heading = /^(#{1,6})\s+(.*)$/;
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const bullet = /^(\s*)[-*+]\s+(.*)$/;
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const ordered = /^(\s*)(\d+)[.)]\s+(.*)$/;
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const quote = /^\s*>\s?(.*)$/;
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const rule = /^\s*([-*_])(\s*\1){2,}\s*$/;
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const tableSep = /^\s*\|?\s*:?-+:?\s*(\|\s*:?-+:?\s*)*\|?\s*$/;
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export function markdown(src, className = "md") {
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return h("div", { class: className }, ...blocks(src.replace(/\r\n?/g, "\n").split("\n")));
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}
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export function inlineMarkdown(src) {
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return h("span", { class: "md-inline" }, ...inline(src));
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}
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function blocks(lines) {
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const out = [];
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let i = 0;
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while (i < lines.length) {
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const line = lines[i];
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if (line.trim() === "") {
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i++;
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continue;
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}
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const f = fence.exec(line);
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if (f) {
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const marker = f[1];
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const body = [];
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i++;
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while (i < lines.length && !lines[i].trimStart().startsWith(marker)) {
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body.push(lines[i]);
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i++;
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}
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i++;
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out.push(h("pre", { class: "md-code" }, h("code", {}, body.join("\n"))));
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continue;
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}
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const hd = heading.exec(line);
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if (hd) {
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const level = Math.min(hd[1].length + 2, 6);
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out.push(h(`h${level}`, {}, ...inline(hd[2])));
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i++;
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continue;
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}
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if (rule.test(line)) {
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out.push(h("hr"));
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i++;
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continue;
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}
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if (quote.test(line)) {
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const body = [];
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while (i < lines.length && quote.test(lines[i])) {
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body.push(quote.exec(lines[i])[1]);
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i++;
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}
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out.push(h("blockquote", {}, ...blocks(body)));
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continue;
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}
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if (bullet.test(line) || ordered.test(line)) {
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const [list, next] = parseList(lines, i);
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out.push(list);
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i = next;
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continue;
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}
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if (line.includes("|") && i + 1 < lines.length && tableSep.test(lines[i + 1])) {
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const rows = [cells(line)];
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i += 2;
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while (i < lines.length && lines[i].includes("|") && lines[i].trim() !== "") {
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rows.push(cells(lines[i]));
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i++;
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}
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out.push(table(rows));
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continue;
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}
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const para = [];
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while (i < lines.length && lines[i].trim() !== "" && !startsBlock(lines, i)) {
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para.push(lines[i].trim());
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i++;
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}
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out.push(h("p", {}, ...joinLines(para)));
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}
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return out;
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}
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function startsBlock(lines, i) {
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const line = lines[i];
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return (fence.test(line) ||
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heading.test(line) ||
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rule.test(line) ||
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quote.test(line) ||
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bullet.test(line) ||
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ordered.test(line) ||
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(line.includes("|") && i + 1 < lines.length && tableSep.test(lines[i + 1])));
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}
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function joinLines(lines) {
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const out = [];
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lines.forEach((l, n) => {
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if (n > 0) {
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out.push(h("br"));
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}
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out.push(...inline(l));
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});
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return out;
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}
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function indentOf(line) {
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return line.length - line.trimStart().length;
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}
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function parseList(lines, start) {
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const first = lines[start];
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const isOrdered = !bullet.test(first);
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const base = indentOf(first);
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const list = isOrdered ? h("ol") : h("ul");
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if (isOrdered) {
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const n = Number(ordered.exec(first)[2]);
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if (n !== 1) {
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list.start = n;
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}
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}
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let i = start;
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while (i < lines.length) {
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const line = lines[i];
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const m = isOrdered ? ordered.exec(line) : bullet.exec(line);
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if (!m || indentOf(line) !== base) {
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break;
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}
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const text = isOrdered ? m[3] : m[2];
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const body = [text];
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i++;
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while (i < lines.length) {
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const next = lines[i];
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if (next.trim() === "") {
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const after = lines[i + 1];
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if (after !== undefined && indentOf(after) > base && after.trim() !== "") {
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body.push("");
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i++;
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continue;
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}
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break;
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}
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if (indentOf(next) <= base && (bullet.test(next) || ordered.test(next) || startsBlock(lines, i))) {
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break;
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}
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body.push(indentOf(next) > base ? next.slice(Math.min(indentOf(next), base + 2)) : next.trim());
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i++;
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}
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list.append(item(body));
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while (i < lines.length && lines[i].trim() === "" && lines[i + 1] !== undefined && indentOf(lines[i + 1]) === base && (isOrdered ? ordered : bullet).test(lines[i + 1])) {
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i++;
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}
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}
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return [list, i];
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}
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function item(body) {
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const li = h("li");
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const rest = body.slice(1);
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if (rest.every((l) => !startsBlockLine(l)) && !rest.includes("")) {
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li.append(...joinLines(body.map((l) => l.trim())));
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return li;
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}
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const head = [body[0]];
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let k = 1;
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while (k < body.length && body[k] !== "" && !startsBlockLine(body[k])) {
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head.push(body[k].trim());
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k++;
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}
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li.append(...joinLines(head), ...blocks(body.slice(k)));
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return li;
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}
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function startsBlockLine(line) {
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return fence.test(line) || heading.test(line) || quote.test(line) || bullet.test(line) || ordered.test(line);
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}
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function cells(line) {
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let s = line.trim();
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if (s.startsWith("|")) {
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s = s.slice(1);
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}
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if (s.endsWith("|")) {
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s = s.slice(0, -1);
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}
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return s.split("|").map((c) => c.trim());
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}
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function table(rows) {
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const [head, ...body] = rows;
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return h("div", { class: "md-table" }, h("table", {}, h("thead", {}, h("tr", {}, ...head.map((c) => h("th", {}, ...inline(c))))), h("tbody", {}, ...body.map((r) => h("tr", {}, ...r.map((c) => h("td", {}, ...inline(c))))))));
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}
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const inlineToken = /`([^`]+)`|\*\*(.+?)\*\*|__(.+?)__|\*([^*\s][^*]*?)\*|(?<![\w])_([^_\s][^_]*?)_(?![\w])|\[([^\]]+)\]\(([^)\s]+)\)|(https?:\/\/[^\s<>()]+[^\s<>().,;:!?'"])/;
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function inline(src) {
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const out = [];
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let rest = src;
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while (rest.length > 0) {
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const m = inlineToken.exec(rest);
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if (!m) {
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out.push(document.createTextNode(rest));
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break;
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}
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if (m.index > 0) {
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out.push(document.createTextNode(rest.slice(0, m.index)));
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}
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const [whole, code, strong1, strong2, em1, em2, linkText, linkHref, bare] = m;
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if (code !== undefined) {
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out.push(h("code", {}, code));
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}
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else if (strong1 !== undefined || strong2 !== undefined) {
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out.push(h("strong", {}, ...inline(strong1 ?? strong2)));
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}
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else if (em1 !== undefined || em2 !== undefined) {
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out.push(h("em", {}, ...inline(em1 ?? em2)));
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}
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else if (linkText !== undefined) {
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out.push(link(linkHref, inline(linkText)));
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}
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else if (bare !== undefined) {
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out.push(link(bare, [document.createTextNode(bare)]));
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}
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rest = rest.slice(m.index + whole.length);
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}
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return out;
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}
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function link(href, children) {
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if (/^https?:\/\//i.test(href)) {
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return h("a", { href, target: "_blank", rel: "noopener noreferrer" }, ...children);
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}
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if (href.startsWith("#/")) {
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return h("a", { href }, ...children);
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}
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return h("span", {}, ...children);
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}
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//# sourceMappingURL=markdown.js.map
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