343 lines
8.7 KiB
JavaScript
343 lines
8.7 KiB
JavaScript
var sourceMappingURL = require("source-map-url")
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var resolveUrl = require("./resolve-url")
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var decodeUriComponent = require("./decode-uri-component")
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var urix = require("urix")
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var atob = require("atob")
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function callbackAsync(callback, error, result) {
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setImmediate(function() { callback(error, result) })
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}
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function parseMapToJSON(string, data) {
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try {
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return JSON.parse(string.replace(/^\)\]\}'/, ""))
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} catch (error) {
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error.sourceMapData = data
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throw error
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}
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}
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function readSync(read, url, data) {
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var readUrl = decodeUriComponent(url)
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try {
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return String(read(readUrl))
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} catch (error) {
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error.sourceMapData = data
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throw error
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}
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}
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function resolveSourceMap(code, codeUrl, read, callback) {
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var mapData
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try {
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mapData = resolveSourceMapHelper(code, codeUrl)
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} catch (error) {
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return callbackAsync(callback, error)
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}
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if (!mapData || mapData.map) {
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return callbackAsync(callback, null, mapData)
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}
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var readUrl = decodeUriComponent(mapData.url)
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read(readUrl, function(error, result) {
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if (error) {
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error.sourceMapData = mapData
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return callback(error)
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}
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mapData.map = String(result)
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try {
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mapData.map = parseMapToJSON(mapData.map, mapData)
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} catch (error) {
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return callback(error)
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}
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callback(null, mapData)
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})
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}
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function resolveSourceMapSync(code, codeUrl, read) {
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var mapData = resolveSourceMapHelper(code, codeUrl)
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if (!mapData || mapData.map) {
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return mapData
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}
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mapData.map = readSync(read, mapData.url, mapData)
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mapData.map = parseMapToJSON(mapData.map, mapData)
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return mapData
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}
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var dataUriRegex = /^data:([^,;]*)(;[^,;]*)*(?:,(.*))?$/
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/**
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* The media type for JSON text is application/json.
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*
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* {@link https://tools.ietf.org/html/rfc8259#section-11 | IANA Considerations }
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*
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* `text/json` is non-standard media type
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*/
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var jsonMimeTypeRegex = /^(?:application|text)\/json$/
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/**
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* JSON text exchanged between systems that are not part of a closed ecosystem
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* MUST be encoded using UTF-8.
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*
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* {@link https://tools.ietf.org/html/rfc8259#section-8.1 | Character Encoding}
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*/
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var jsonCharacterEncoding = "utf-8"
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function base64ToBuf(b64) {
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var binStr = atob(b64)
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var len = binStr.length
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var arr = new Uint8Array(len)
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for (var i = 0; i < len; i++) {
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arr[i] = binStr.charCodeAt(i)
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}
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return arr
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}
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function decodeBase64String(b64) {
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if (typeof TextDecoder === "undefined" || typeof Uint8Array === "undefined") {
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return atob(b64)
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}
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var buf = base64ToBuf(b64);
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// Note: `decoder.decode` method will throw a `DOMException` with the
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// `"EncodingError"` value when an coding error is found.
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var decoder = new TextDecoder(jsonCharacterEncoding, {fatal: true})
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return decoder.decode(buf);
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}
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function resolveSourceMapHelper(code, codeUrl) {
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codeUrl = urix(codeUrl)
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var url = sourceMappingURL.getFrom(code)
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if (!url) {
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return null
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}
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var dataUri = url.match(dataUriRegex)
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if (dataUri) {
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var mimeType = dataUri[1] || "text/plain"
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var lastParameter = dataUri[2] || ""
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var encoded = dataUri[3] || ""
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var data = {
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sourceMappingURL: url,
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url: null,
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sourcesRelativeTo: codeUrl,
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map: encoded
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}
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if (!jsonMimeTypeRegex.test(mimeType)) {
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var error = new Error("Unuseful data uri mime type: " + mimeType)
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error.sourceMapData = data
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throw error
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}
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try {
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data.map = parseMapToJSON(
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lastParameter === ";base64" ? decodeBase64String(encoded) : decodeURIComponent(encoded),
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data
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)
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} catch (error) {
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error.sourceMapData = data
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throw error
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}
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return data
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}
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var mapUrl = resolveUrl(codeUrl, url)
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return {
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sourceMappingURL: url,
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url: mapUrl,
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sourcesRelativeTo: mapUrl,
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map: null
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}
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}
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function resolveSources(map, mapUrl, read, options, callback) {
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if (typeof options === "function") {
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callback = options
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options = {}
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}
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var pending = map.sources ? map.sources.length : 0
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var result = {
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sourcesResolved: [],
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sourcesContent: []
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}
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if (pending === 0) {
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callbackAsync(callback, null, result)
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return
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}
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var done = function() {
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pending--
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if (pending === 0) {
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callback(null, result)
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}
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}
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resolveSourcesHelper(map, mapUrl, options, function(fullUrl, sourceContent, index) {
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result.sourcesResolved[index] = fullUrl
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if (typeof sourceContent === "string") {
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result.sourcesContent[index] = sourceContent
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callbackAsync(done, null)
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} else {
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var readUrl = decodeUriComponent(fullUrl)
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read(readUrl, function(error, source) {
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result.sourcesContent[index] = error ? error : String(source)
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done()
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})
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}
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})
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}
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function resolveSourcesSync(map, mapUrl, read, options) {
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var result = {
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sourcesResolved: [],
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sourcesContent: []
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}
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if (!map.sources || map.sources.length === 0) {
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return result
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}
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resolveSourcesHelper(map, mapUrl, options, function(fullUrl, sourceContent, index) {
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result.sourcesResolved[index] = fullUrl
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if (read !== null) {
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if (typeof sourceContent === "string") {
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result.sourcesContent[index] = sourceContent
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} else {
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var readUrl = decodeUriComponent(fullUrl)
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try {
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result.sourcesContent[index] = String(read(readUrl))
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} catch (error) {
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result.sourcesContent[index] = error
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}
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}
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}
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})
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return result
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}
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var endingSlash = /\/?$/
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function resolveSourcesHelper(map, mapUrl, options, fn) {
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options = options || {}
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mapUrl = urix(mapUrl)
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var fullUrl
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var sourceContent
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var sourceRoot
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for (var index = 0, len = map.sources.length; index < len; index++) {
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sourceRoot = null
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if (typeof options.sourceRoot === "string") {
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sourceRoot = options.sourceRoot
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} else if (typeof map.sourceRoot === "string" && options.sourceRoot !== false) {
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sourceRoot = map.sourceRoot
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}
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// If the sourceRoot is the empty string, it is equivalent to not setting
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// the property at all.
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if (sourceRoot === null || sourceRoot === '') {
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fullUrl = resolveUrl(mapUrl, map.sources[index])
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} else {
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// Make sure that the sourceRoot ends with a slash, so that `/scripts/subdir` becomes
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// `/scripts/subdir/<source>`, not `/scripts/<source>`. Pointing to a file as source root
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// does not make sense.
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fullUrl = resolveUrl(mapUrl, sourceRoot.replace(endingSlash, "/"), map.sources[index])
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}
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sourceContent = (map.sourcesContent || [])[index]
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fn(fullUrl, sourceContent, index)
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}
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}
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function resolve(code, codeUrl, read, options, callback) {
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if (typeof options === "function") {
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callback = options
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options = {}
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}
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if (code === null) {
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var mapUrl = codeUrl
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var data = {
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sourceMappingURL: null,
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url: mapUrl,
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sourcesRelativeTo: mapUrl,
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map: null
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}
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var readUrl = decodeUriComponent(mapUrl)
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read(readUrl, function(error, result) {
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if (error) {
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error.sourceMapData = data
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return callback(error)
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}
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data.map = String(result)
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try {
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data.map = parseMapToJSON(data.map, data)
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} catch (error) {
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return callback(error)
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}
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_resolveSources(data)
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})
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} else {
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resolveSourceMap(code, codeUrl, read, function(error, mapData) {
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if (error) {
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return callback(error)
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}
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if (!mapData) {
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return callback(null, null)
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}
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_resolveSources(mapData)
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})
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}
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function _resolveSources(mapData) {
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resolveSources(mapData.map, mapData.sourcesRelativeTo, read, options, function(error, result) {
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if (error) {
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return callback(error)
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}
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mapData.sourcesResolved = result.sourcesResolved
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mapData.sourcesContent = result.sourcesContent
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callback(null, mapData)
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})
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}
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}
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function resolveSync(code, codeUrl, read, options) {
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var mapData
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if (code === null) {
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var mapUrl = codeUrl
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mapData = {
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sourceMappingURL: null,
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url: mapUrl,
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sourcesRelativeTo: mapUrl,
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map: null
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}
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mapData.map = readSync(read, mapUrl, mapData)
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mapData.map = parseMapToJSON(mapData.map, mapData)
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} else {
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mapData = resolveSourceMapSync(code, codeUrl, read)
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if (!mapData) {
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return null
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}
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}
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var result = resolveSourcesSync(mapData.map, mapData.sourcesRelativeTo, read, options)
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mapData.sourcesResolved = result.sourcesResolved
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mapData.sourcesContent = result.sourcesContent
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return mapData
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}
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module.exports = {
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resolveSourceMap: resolveSourceMap,
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resolveSourceMapSync: resolveSourceMapSync,
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resolveSources: resolveSources,
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resolveSourcesSync: resolveSourcesSync,
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resolve: resolve,
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resolveSync: resolveSync,
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parseMapToJSON: parseMapToJSON
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}
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