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import { determineUrlType, URL_TYPE } from './url-type';
const BASE_URL = 'http://__domain__.invalid/';
/**
* Format a URL as a particular type.
* Does not support formatting invalid or path-relative URLs.
* @param url The URL to format.
* @param urlType The URL type into which to format. If not provided, defaults to the same type as `url`, which effectively results in the URL being normalized.
* @returns The formatted URL.
*/
export default function format(
url: string | URL,
urlType?: Exclude< URL_TYPE, URL_TYPE.INVALID | URL_TYPE.PATH_RELATIVE >
): string {
let parsed: URL;
let originalType: URL_TYPE;
if ( ! ( url instanceof URL ) && typeof url !== 'string' ) {
throw new Error( '`url` should be a string or URL instance' );
}
if ( url instanceof URL ) {
// The native URL object can only represent absolute URLs.
parsed = url;
originalType = URL_TYPE.ABSOLUTE;
} else {
originalType = determineUrlType( url );
if ( originalType === URL_TYPE.INVALID ) {
throw new Error( 'Cannot format an invalid URL.' );
}
if ( originalType === URL_TYPE.PATH_RELATIVE ) {
throw new Error( 'Cannot format path-relative URLs.' );
}
parsed = new URL( url as string, BASE_URL );
}
if ( urlType === undefined ) {
urlType = originalType;
}
switch ( urlType as URL_TYPE ) {
case URL_TYPE.PATH_RELATIVE:
throw new Error( 'Cannot format into path-relative URLs.' );
case URL_TYPE.PATH_ABSOLUTE:
return parsed.href.replace( parsed.origin, '' );
case URL_TYPE.SCHEME_RELATIVE:
if ( originalType === URL_TYPE.PATH_ABSOLUTE ) {
throw new Error( 'Cannot format a path-absolute URL as a scheme-relative URL.' );
}
return parsed.href.replace( parsed.protocol, '' );
case URL_TYPE.ABSOLUTE:
if ( originalType !== URL_TYPE.ABSOLUTE ) {
throw new Error( 'Cannot format a partial URL as an absolute URL.' );
}
return parsed.href;
default:
throw new Error( `Cannot format as \`${ urlType }\` URL type.` );
}
}
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