File size: 2,795 Bytes
5448d8b | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 | /**
* Minimal YAML frontmatter reader/writer for idea files.
* Supports: scalars (string/number/bool), nested object (one level), inline arrays [a, b].
* Not a general YAML lib — kept simple intentionally.
*/
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+/, "");
}
|