71 lines
2.0 KiB
TypeScript
71 lines
2.0 KiB
TypeScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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import type {RawData, Data} from './types';
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function splitHeader(content: string): RawData {
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// New line characters need to handle all operating systems.
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const lines = content.split(/\r?\n/);
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if (lines[0] !== '---') {
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return {};
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}
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let i = 1;
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for (; i < lines.length - 1; i = 1 + i) {
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if (lines[i] === '---') {
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break;
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}
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}
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return {
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header: lines.slice(1, i + 1).join('\n'),
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content: lines.slice(i + 1).join('\n'),
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};
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}
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export default function extractMetadata(content: string): Data {
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const metadata: {[key: string]: string} = {};
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const both = splitHeader(content);
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if (!both.content) {
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if (!both.header) {
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return {metadata, rawContent: content};
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}
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return {metadata, rawContent: both.header};
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}
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// New line characters => to handle all operating systems.
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const lines = (both.header ?? '').split(/\r?\n/);
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lines.slice(0, -1).forEach((line) => {
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const keyValue = line.split(':') as [string, ...string[]];
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const key = keyValue[0].trim();
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const value = keyValue.slice(1).join(':').trim();
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metadata[key] = value;
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});
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return {metadata, rawContent: both.content};
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}
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// The new front matter parser need some special chars to
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export function shouldQuotifyFrontMatter([key, value]: [
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string,
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string,
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]): boolean {
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if (key === 'tags') {
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return false;
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}
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if (String(value).match(/^(?<quote>["']).+\1$/)) {
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return false;
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}
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// title: !something needs quotes because otherwise it's a YAML tag.
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if (!String(value).trim().match(/^\w.*/)) {
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return true;
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}
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// TODO this is not ideal to have to maintain such a list of allowed chars
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// maybe we should quotify if gray-matter throws instead?
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return !String(value).match(
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// cSpell:ignore àáâãäåçèéêëìíîïðòóôõöùúûüýÿ
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/^[\w .\-àáâãäåçèéêëìíîïðòóôõöùúûüýÿ!;,=+?'`&#()[\]§%€$]+$/,
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);
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}
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