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import { dirname, resolve } from 'path';
import { readFile, readFileSync, Promise } from 'sander';
import atob from './atob.js';
import SOURCEMAPPING_URL from './sourceMappingURL.js';
function parseJSON ( json, url ) {
try {
return JSON.parse( json );
} catch ( err ) {
throw new Error( `Could not parse sourcemap (${url}): ${err.message}` );
}
}
/**
* Turns a sourceMappingURL into a sourcemap
* @param {string} url - the sourceMappingURL. Can be a
base64-encoded data URI
* @param {string} base - the URL against which relative URLS
should be resolved
* @param {boolean} sync - if `true`, return a promise, otherwise
return the sourcemap
* @returns {object} - a version 3 sourcemap
*/
export default function getMapFromUrl ( url, base, sync ) {
if ( /^data:/.test( url ) ) { // TODO beef this up
const match = /base64,(.+)$/.exec( url );
if ( !match ) {
throw new Error( `${SOURCEMAPPING_URL} is not base64-encoded` );
}
const json = atob( match[1] );
const map = parseJSON( json, `data URI in ${base}` );
return sync ? map : Promise.resolve( map );
}
url = resolve( dirname( base ), decodeURI( url ) );
if ( sync ) {
return parseJSON( readFileSync( url, { encoding: 'utf-8' }), url );
} else {
return readFile( url, { encoding: 'utf-8' }).then( json => parseJSON( json, url ) );
}
}
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