| |
| |
| |
| |
|
|
|
|
| const DELIM = "---";
|
|
|
| function parseScalar(raw) {
|
| const s = raw.trim();
|
| if (s === "true") return true;
|
| if (s === "false") return false;
|
| if (s === "null") return null;
|
| if (/^-?\d+(\.\d+)?$/.test(s)) return Number(s);
|
| if (s.startsWith("[") && s.endsWith("]")) {
|
| const inner = s.slice(1, -1).trim();
|
| if (!inner) return [];
|
| return inner.split(",").map((x) => parseScalar(x.trim()));
|
| }
|
| if ((s.startsWith('"') && s.endsWith('"')) || (s.startsWith("'") && s.endsWith("'"))) {
|
| return s.slice(1, -1);
|
| }
|
| return s;
|
| }
|
|
|
| export function parseFrontmatter(text) {
|
| if (typeof text !== "string") return null;
|
| if (!text.startsWith(`${DELIM}\n`)) return null;
|
| const rest = text.slice(DELIM.length + 1);
|
| const closeIdx = rest.indexOf(`\n${DELIM}`);
|
| if (closeIdx < 0) return null;
|
| const body = rest.slice(0, closeIdx);
|
|
|
| const out = {};
|
| let currentNested = null;
|
|
|
| for (const line of body.split("\n")) {
|
| if (!line.trim()) continue;
|
| if (line.startsWith(" ") && currentNested) {
|
| const m = line.match(/^\s{2}([\w_-]+):\s*(.*)$/);
|
| if (m) currentNested[m[1]] = parseScalar(m[2]);
|
| continue;
|
| }
|
| const m = line.match(/^([\w_-]+):\s*(.*)$/);
|
| if (!m) continue;
|
| const key = m[1];
|
| const val = m[2];
|
| if (val === "") {
|
| currentNested = {};
|
| out[key] = currentNested;
|
| } else {
|
| currentNested = null;
|
| out[key] = parseScalar(val);
|
| }
|
| }
|
| return out;
|
| }
|
|
|
| function serializeScalar(v) {
|
| if (v === null) return "null";
|
| if (typeof v === "boolean") return String(v);
|
| if (typeof v === "number") return String(v);
|
| if (Array.isArray(v)) return `[${v.map(serializeScalar).join(", ")}]`;
|
| return String(v);
|
| }
|
|
|
| export function serializeFrontmatter(meta, body) {
|
| const lines = [DELIM];
|
| for (const [k, v] of Object.entries(meta)) {
|
| if (v && typeof v === "object" && !Array.isArray(v)) {
|
| lines.push(`${k}:`);
|
| for (const [nk, nv] of Object.entries(v)) {
|
| lines.push(` ${nk}: ${serializeScalar(nv)}`);
|
| }
|
| } else {
|
| lines.push(`${k}: ${serializeScalar(v)}`);
|
| }
|
| }
|
| lines.push(DELIM, "", body);
|
| return lines.join("\n");
|
| }
|
|
|
| export function stripFrontmatter(text) {
|
| if (typeof text !== "string") return text;
|
| if (!text.startsWith(`${DELIM}\n`)) return text;
|
| const rest = text.slice(DELIM.length + 1);
|
| const closeIdx = rest.indexOf(`\n${DELIM}`);
|
| if (closeIdx < 0) return text;
|
| return rest.slice(closeIdx + DELIM.length + 1).replace(/^\n+/, "");
|
| }
|
|
|
