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utils.ts
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utils.ts
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import type { Options as AcornOpts } from 'acorn';
import { parse } from 'acorn';
import type { AstroConfig, SSRError } from 'astro';
import matter from 'gray-matter';
import type { MdxjsEsm } from 'mdast-util-mdx';
function appendForwardSlash(path: string) {
return path.endsWith('/') ? path : path + '/';
}
interface FileInfo {
fileId: string;
fileUrl: string;
}
/** @see 'vite-plugin-utils' for source */
export function getFileInfo(id: string, config: AstroConfig): FileInfo {
const sitePathname = appendForwardSlash(
config.site ? new URL(config.base, config.site).pathname : config.base
);
// Try to grab the file's actual URL
let url: URL | undefined = undefined;
try {
url = new URL(`file://${id}`);
} catch {}
const fileId = id.split('?')[0];
let fileUrl: string;
const isPage = fileId.includes('/pages/');
if (isPage) {
fileUrl = fileId.replace(/^.*?\/pages\//, sitePathname).replace(/(\/index)?\.mdx$/, '');
} else if (url && url.pathname.startsWith(config.root.pathname)) {
fileUrl = url.pathname.slice(config.root.pathname.length);
} else {
fileUrl = fileId;
}
if (fileUrl && config.trailingSlash === 'always') {
fileUrl = appendForwardSlash(fileUrl);
}
return { fileId, fileUrl };
}
/**
* Match YAML exception handling from Astro core errors
* @see 'astro/src/core/errors.ts'
*/
export function parseFrontmatter(code: string, id: string) {
try {
return matter(code);
} catch (e: any) {
if (e.name === 'YAMLException') {
const err: SSRError = e;
err.id = id;
err.loc = { file: e.id, line: e.mark.line + 1, column: e.mark.column };
err.message = e.reason;
throw err;
} else {
throw e;
}
}
}
export function jsToTreeNode(
jsString: string,
acornOpts: AcornOpts = {
ecmaVersion: 'latest',
sourceType: 'module',
}
): MdxjsEsm {
return {
type: 'mdxjsEsm',
value: '',
data: {
estree: {
body: [],
...parse(jsString, acornOpts),
type: 'Program',
sourceType: 'module',
},
},
};
}
// TODO: remove for 1.0
export function handleExtendsNotSupported(pluginConfig: any) {
if (
typeof pluginConfig === 'object' &&
pluginConfig !== null &&
(pluginConfig as any).hasOwnProperty('extends')
) {
throw new Error(
`[MDX] The "extends" plugin option is no longer supported! Astro now extends your project's \`markdown\` plugin configuration by default. To customize this behavior, see the \`extendPlugins\` option instead: https://docs.astro.build/en/guides/integrations-guide/mdx/#extendplugins`
);
}
}
// Following utils taken from `packages/astro/src/core/path.ts`:
export function isRelativePath(path: string) {
return startsWithDotDotSlash(path) || startsWithDotSlash(path);
}
function startsWithDotDotSlash(path: string) {
const c1 = path[0];
const c2 = path[1];
const c3 = path[2];
return c1 === '.' && c2 === '.' && c3 === '/';
}
function startsWithDotSlash(path: string) {
const c1 = path[0];
const c2 = path[1];
return c1 === '.' && c2 === '/';
}