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rOACCT/node_modules/c8/lib/source-map-from-file.js
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source-map-from-file.js
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			/*
			* Copyright Node.js contributors. All rights reserved.
			*
			* Permission is hereby granted, free of charge, to any person obtaining a copy
			* of this software and associated documentation files (the "Software"), to
			* deal in the Software without restriction, including without limitation the
			* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
			* sell copies of the Software, and to permit persons to whom the Software is
			* furnished to do so, subject to the following conditions:
			*
			* The above copyright notice and this permission notice shall be included in
			* all copies or substantial portions of the Software.
			*
			* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
			* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
			* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
			* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
			* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
			* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
			* IN THE SOFTWARE.
			*/
			// TODO(bcoe): this logic is ported from Node.js' internal source map
			// helpers:
			// https://github.com/nodejs/node/blob/master/lib/internal/source_map/source_map_cache.js
			// we should to upstream and downstream fixes.

			const { readFileSync } = require('fs')
			const { fileURLToPath, pathToFileURL } = require('url')
			const util = require('util')
			const debuglog = util.debuglog('c8')

			/**
			* Extract the sourcemap url from a source file
			* reference: https://sourcemaps.info/spec.html
			* @param {String} file - compilation target file
			* @returns {String} full path to source map file
			* @private
			*/
			function getSourceMapFromFile (filename) {
			const fileBody = readFileSync(filename).toString()
			const sourceMapLineRE = /\/[*/]#\s+sourceMappingURL=(?<sourceMappingURL>[^\s]+)/
			const results = fileBody.match(sourceMapLineRE)
			if (results !== null) {
			const sourceMappingURL = results.groups.sourceMappingURL
			const sourceMap = dataFromUrl(pathToFileURL(filename), sourceMappingURL)
			return sourceMap
			} else {
			return null
			}
			}

			function dataFromUrl (sourceURL, sourceMappingURL) {
			try {
			const url = new URL(sourceMappingURL)
			switch (url.protocol) {
			case 'data:':
			return sourceMapFromDataUrl(url.pathname)
			default:
			return null
			}
			} catch (err) {
			debuglog(err)
			// If no scheme is present, we assume we are dealing with a file path.
			const mapURL = new URL(sourceMappingURL, sourceURL).href
			return sourceMapFromFile(mapURL)
			}
			}

			function sourceMapFromFile (mapURL) {
			try {
			const content = readFileSync(fileURLToPath(mapURL), 'utf8')
			return JSON.parse(content)
			} catch (err) {
			debuglog(err)
			return null
			}
			}

			// data:[<mediatype>][;base64],<data> see:
			// https://tools.ietf.org/html/rfc2397#section-2
			function sourceMapFromDataUrl (url) {
			const { 0: format, 1: data } = url.split(',')
			const splitFormat = format.split(';')
			const contentType = splitFormat[0]
			const base64 = splitFormat[splitFormat.length - 1] === 'base64'
			if (contentType === 'application/json') {
			const decodedData = base64 ? Buffer.from(data, 'base64').toString('utf8') : data
			try {
			return JSON.parse(decodedData)
			} catch (err) {
			debuglog(err)
			return null
			}
			} else {
			debuglog(`unexpected content-type ${contentType}`)
			return null
			}
			}

			module.exports = getSourceMapFromFile