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fb4d8fe | 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 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | import YAML from "yaml";
export type ParsedFrontmatter = Record<string, string>;
function stripQuotes(value: string): string {
if (
(value.startsWith('"') && value.endsWith('"')) ||
(value.startsWith("'") && value.endsWith("'"))
) {
return value.slice(1, -1);
}
return value;
}
function coerceFrontmatterValue(value: unknown): string | undefined {
if (value === null || value === undefined) {
return undefined;
}
if (typeof value === "string") {
return value.trim();
}
if (typeof value === "number" || typeof value === "boolean") {
return String(value);
}
if (typeof value === "object") {
try {
return JSON.stringify(value);
} catch {
return undefined;
}
}
return undefined;
}
function parseYamlFrontmatter(block: string): ParsedFrontmatter | null {
try {
const parsed = YAML.parse(block) as unknown;
if (!parsed || typeof parsed !== "object" || Array.isArray(parsed)) {
return null;
}
const result: ParsedFrontmatter = {};
for (const [rawKey, value] of Object.entries(parsed as Record<string, unknown>)) {
const key = rawKey.trim();
if (!key) {
continue;
}
const coerced = coerceFrontmatterValue(value);
if (coerced === undefined) {
continue;
}
result[key] = coerced;
}
return result;
} catch {
return null;
}
}
function extractMultiLineValue(
lines: string[],
startIndex: number,
): { value: string; linesConsumed: number } {
const startLine = lines[startIndex];
const match = startLine.match(/^([\w-]+):\s*(.*)$/);
if (!match) {
return { value: "", linesConsumed: 1 };
}
const inlineValue = match[2].trim();
if (inlineValue) {
return { value: inlineValue, linesConsumed: 1 };
}
const valueLines: string[] = [];
let i = startIndex + 1;
while (i < lines.length) {
const line = lines[i];
if (line.length > 0 && !line.startsWith(" ") && !line.startsWith("\t")) {
break;
}
valueLines.push(line);
i++;
}
const combined = valueLines.join("\n").trim();
return { value: combined, linesConsumed: i - startIndex };
}
function parseLineFrontmatter(block: string): ParsedFrontmatter {
const frontmatter: ParsedFrontmatter = {};
const lines = block.split("\n");
let i = 0;
while (i < lines.length) {
const line = lines[i];
const match = line.match(/^([\w-]+):\s*(.*)$/);
if (!match) {
i++;
continue;
}
const key = match[1];
const inlineValue = match[2].trim();
if (!key) {
i++;
continue;
}
if (!inlineValue && i + 1 < lines.length) {
const nextLine = lines[i + 1];
if (nextLine.startsWith(" ") || nextLine.startsWith("\t")) {
const { value, linesConsumed } = extractMultiLineValue(lines, i);
if (value) {
frontmatter[key] = value;
}
i += linesConsumed;
continue;
}
}
const value = stripQuotes(inlineValue);
if (value) {
frontmatter[key] = value;
}
i++;
}
return frontmatter;
}
export function parseFrontmatterBlock(content: string): ParsedFrontmatter {
const normalized = content.replace(/\r\n/g, "\n").replace(/\r/g, "\n");
if (!normalized.startsWith("---")) {
return {};
}
const endIndex = normalized.indexOf("\n---", 3);
if (endIndex === -1) {
return {};
}
const block = normalized.slice(4, endIndex);
const lineParsed = parseLineFrontmatter(block);
const yamlParsed = parseYamlFrontmatter(block);
if (yamlParsed === null) {
return lineParsed;
}
const merged: ParsedFrontmatter = { ...yamlParsed };
for (const [key, value] of Object.entries(lineParsed)) {
if (value.startsWith("{") || value.startsWith("[")) {
merged[key] = value;
}
}
return merged;
}
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