568 lines
18 KiB
JavaScript
568 lines
18 KiB
JavaScript
var SourceMapConsumer = require('source-map').SourceMapConsumer;
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var path = require('path');
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var fs;
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try {
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fs = require('fs');
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if (!fs.existsSync || !fs.readFileSync) {
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// fs doesn't have all methods we need
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fs = null;
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}
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} catch (err) {
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/* nop */
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}
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var bufferFrom = require('buffer-from');
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// Only install once if called multiple times
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var errorFormatterInstalled = false;
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var uncaughtShimInstalled = false;
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// If true, the caches are reset before a stack trace formatting operation
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var emptyCacheBetweenOperations = false;
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// Supports {browser, node, auto}
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var environment = "auto";
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// Maps a file path to a string containing the file contents
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var fileContentsCache = {};
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// Maps a file path to a source map for that file
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var sourceMapCache = {};
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// Regex for detecting source maps
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var reSourceMap = /^data:application\/json[^,]+base64,/;
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// Priority list of retrieve handlers
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var retrieveFileHandlers = [];
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var retrieveMapHandlers = [];
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function isInBrowser() {
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if (environment === "browser")
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return true;
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if (environment === "node")
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return false;
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return ((typeof window !== 'undefined') && (typeof XMLHttpRequest === 'function') && !(window.require && window.module && window.process && window.process.type === "renderer"));
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}
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function hasGlobalProcessEventEmitter() {
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return ((typeof process === 'object') && (process !== null) && (typeof process.on === 'function'));
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}
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function handlerExec(list) {
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return function(arg) {
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for (var i = 0; i < list.length; i++) {
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var ret = list[i](arg);
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if (ret) {
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return ret;
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}
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}
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return null;
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};
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}
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var retrieveFile = handlerExec(retrieveFileHandlers);
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retrieveFileHandlers.push(function(path) {
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// Trim the path to make sure there is no extra whitespace.
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path = path.trim();
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if (/^file:/.test(path)) {
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// existsSync/readFileSync can't handle file protocol, but once stripped, it works
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path = path.replace(/file:\/\/\/(\w:)?/, function(protocol, drive) {
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return drive ?
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'' : // file:///C:/dir/file -> C:/dir/file
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'/'; // file:///root-dir/file -> /root-dir/file
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});
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}
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if (path in fileContentsCache) {
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return fileContentsCache[path];
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}
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var contents = '';
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try {
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if (!fs) {
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// Use SJAX if we are in the browser
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var xhr = new XMLHttpRequest();
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xhr.open('GET', path, /** async */ false);
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xhr.send(null);
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if (xhr.readyState === 4 && xhr.status === 200) {
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contents = xhr.responseText;
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}
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} else if (fs.existsSync(path)) {
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// Otherwise, use the filesystem
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contents = fs.readFileSync(path, 'utf8');
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}
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} catch (er) {
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/* ignore any errors */
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}
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return fileContentsCache[path] = contents;
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});
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// Support URLs relative to a directory, but be careful about a protocol prefix
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// in case we are in the browser (i.e. directories may start with "http://" or "file:///")
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function supportRelativeURL(file, url) {
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if (!file) return url;
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var dir = path.dirname(file);
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var match = /^\w+:\/\/[^\/]*/.exec(dir);
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var protocol = match ? match[0] : '';
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var startPath = dir.slice(protocol.length);
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if (protocol && /^\/\w\:/.test(startPath)) {
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// handle file:///C:/ paths
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protocol += '/';
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return protocol + path.resolve(dir.slice(protocol.length), url).replace(/\\/g, '/');
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}
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return protocol + path.resolve(dir.slice(protocol.length), url);
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}
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function retrieveSourceMapURL(source) {
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var fileData;
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if (isInBrowser()) {
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try {
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var xhr = new XMLHttpRequest();
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xhr.open('GET', source, false);
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xhr.send(null);
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fileData = xhr.readyState === 4 ? xhr.responseText : null;
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// Support providing a sourceMappingURL via the SourceMap header
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var sourceMapHeader = xhr.getResponseHeader("SourceMap") ||
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xhr.getResponseHeader("X-SourceMap");
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if (sourceMapHeader) {
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return sourceMapHeader;
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}
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} catch (e) {
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}
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}
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// Get the URL of the source map
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fileData = retrieveFile(source);
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var re = /(?:\/\/[@#][\s]*sourceMappingURL=([^\s'"]+)[\s]*$)|(?:\/\*[@#][\s]*sourceMappingURL=([^\s*'"]+)[\s]*(?:\*\/)[\s]*$)/mg;
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// Keep executing the search to find the *last* sourceMappingURL to avoid
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// picking up sourceMappingURLs from comments, strings, etc.
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var lastMatch, match;
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while (match = re.exec(fileData)) lastMatch = match;
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if (!lastMatch) return null;
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return lastMatch[1];
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};
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// Can be overridden by the retrieveSourceMap option to install. Takes a
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// generated source filename; returns a {map, optional url} object, or null if
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// there is no source map. The map field may be either a string or the parsed
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// JSON object (ie, it must be a valid argument to the SourceMapConsumer
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// constructor).
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var retrieveSourceMap = handlerExec(retrieveMapHandlers);
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retrieveMapHandlers.push(function(source) {
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var sourceMappingURL = retrieveSourceMapURL(source);
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if (!sourceMappingURL) return null;
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// Read the contents of the source map
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var sourceMapData;
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if (reSourceMap.test(sourceMappingURL)) {
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// Support source map URL as a data url
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var rawData = sourceMappingURL.slice(sourceMappingURL.indexOf(',') + 1);
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sourceMapData = bufferFrom(rawData, "base64").toString();
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sourceMappingURL = source;
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} else {
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// Support source map URLs relative to the source URL
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sourceMappingURL = supportRelativeURL(source, sourceMappingURL);
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sourceMapData = retrieveFile(sourceMappingURL);
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}
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if (!sourceMapData) {
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return null;
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}
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return {
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url: sourceMappingURL,
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map: sourceMapData
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};
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});
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function mapSourcePosition(position) {
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var sourceMap = sourceMapCache[position.source];
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if (!sourceMap) {
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// Call the (overrideable) retrieveSourceMap function to get the source map.
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var urlAndMap = retrieveSourceMap(position.source);
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if (urlAndMap) {
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sourceMap = sourceMapCache[position.source] = {
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url: urlAndMap.url,
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map: new SourceMapConsumer(urlAndMap.map)
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};
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// Load all sources stored inline with the source map into the file cache
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// to pretend like they are already loaded. They may not exist on disk.
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if (sourceMap.map.sourcesContent) {
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sourceMap.map.sources.forEach(function(source, i) {
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var contents = sourceMap.map.sourcesContent[i];
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if (contents) {
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var url = supportRelativeURL(sourceMap.url, source);
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fileContentsCache[url] = contents;
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}
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});
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}
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} else {
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sourceMap = sourceMapCache[position.source] = {
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url: null,
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map: null
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};
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}
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}
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// Resolve the source URL relative to the URL of the source map
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if (sourceMap && sourceMap.map && typeof sourceMap.map.originalPositionFor === 'function') {
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var originalPosition = sourceMap.map.originalPositionFor(position);
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// Only return the original position if a matching line was found. If no
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// matching line is found then we return position instead, which will cause
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// the stack trace to print the path and line for the compiled file. It is
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// better to give a precise location in the compiled file than a vague
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// location in the original file.
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if (originalPosition.source !== null) {
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originalPosition.source = supportRelativeURL(
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sourceMap.url, originalPosition.source);
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return originalPosition;
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}
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}
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return position;
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}
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// Parses code generated by FormatEvalOrigin(), a function inside V8:
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// https://code.google.com/p/v8/source/browse/trunk/src/messages.js
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function mapEvalOrigin(origin) {
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// Most eval() calls are in this format
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var match = /^eval at ([^(]+) \((.+):(\d+):(\d+)\)$/.exec(origin);
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if (match) {
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var position = mapSourcePosition({
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source: match[2],
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line: +match[3],
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column: match[4] - 1
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});
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return 'eval at ' + match[1] + ' (' + position.source + ':' +
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position.line + ':' + (position.column + 1) + ')';
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}
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// Parse nested eval() calls using recursion
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match = /^eval at ([^(]+) \((.+)\)$/.exec(origin);
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if (match) {
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return 'eval at ' + match[1] + ' (' + mapEvalOrigin(match[2]) + ')';
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}
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// Make sure we still return useful information if we didn't find anything
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return origin;
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}
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// This is copied almost verbatim from the V8 source code at
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// https://code.google.com/p/v8/source/browse/trunk/src/messages.js. The
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// implementation of wrapCallSite() used to just forward to the actual source
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// code of CallSite.prototype.toString but unfortunately a new release of V8
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// did something to the prototype chain and broke the shim. The only fix I
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// could find was copy/paste.
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function CallSiteToString() {
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var fileName;
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var fileLocation = "";
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if (this.isNative()) {
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fileLocation = "native";
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} else {
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fileName = this.getScriptNameOrSourceURL();
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if (!fileName && this.isEval()) {
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fileLocation = this.getEvalOrigin();
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fileLocation += ", "; // Expecting source position to follow.
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}
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if (fileName) {
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fileLocation += fileName;
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} else {
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// Source code does not originate from a file and is not native, but we
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// can still get the source position inside the source string, e.g. in
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// an eval string.
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fileLocation += "<anonymous>";
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}
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var lineNumber = this.getLineNumber();
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if (lineNumber != null) {
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fileLocation += ":" + lineNumber;
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var columnNumber = this.getColumnNumber();
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if (columnNumber) {
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fileLocation += ":" + columnNumber;
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}
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}
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}
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var line = "";
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var functionName = this.getFunctionName();
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var addSuffix = true;
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var isConstructor = this.isConstructor();
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var isMethodCall = !(this.isToplevel() || isConstructor);
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if (isMethodCall) {
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var typeName = this.getTypeName();
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// Fixes shim to be backward compatable with Node v0 to v4
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if (typeName === "[object Object]") {
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typeName = "null";
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}
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var methodName = this.getMethodName();
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if (functionName) {
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if (typeName && functionName.indexOf(typeName) != 0) {
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line += typeName + ".";
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}
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line += functionName;
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if (methodName && functionName.indexOf("." + methodName) != functionName.length - methodName.length - 1) {
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line += " [as " + methodName + "]";
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}
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} else {
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line += typeName + "." + (methodName || "<anonymous>");
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}
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} else if (isConstructor) {
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line += "new " + (functionName || "<anonymous>");
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} else if (functionName) {
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line += functionName;
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} else {
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line += fileLocation;
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addSuffix = false;
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}
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if (addSuffix) {
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line += " (" + fileLocation + ")";
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}
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return line;
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}
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function cloneCallSite(frame) {
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var object = {};
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Object.getOwnPropertyNames(Object.getPrototypeOf(frame)).forEach(function(name) {
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object[name] = /^(?:is|get)/.test(name) ? function() { return frame[name].call(frame); } : frame[name];
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});
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object.toString = CallSiteToString;
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return object;
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}
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function wrapCallSite(frame) {
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if(frame.isNative()) {
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return frame;
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}
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// Most call sites will return the source file from getFileName(), but code
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// passed to eval() ending in "//# sourceURL=..." will return the source file
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// from getScriptNameOrSourceURL() instead
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var source = frame.getFileName() || frame.getScriptNameOrSourceURL();
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if (source) {
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var line = frame.getLineNumber();
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var column = frame.getColumnNumber() - 1;
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// Fix position in Node where some (internal) code is prepended.
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// See https://github.com/evanw/node-source-map-support/issues/36
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var headerLength = 62;
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if (line === 1 && column > headerLength && !isInBrowser() && !frame.isEval()) {
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column -= headerLength;
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}
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var position = mapSourcePosition({
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source: source,
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line: line,
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column: column
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});
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frame = cloneCallSite(frame);
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var originalFunctionName = frame.getFunctionName;
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frame.getFunctionName = function() { return position.name || originalFunctionName(); };
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frame.getFileName = function() { return position.source; };
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frame.getLineNumber = function() { return position.line; };
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frame.getColumnNumber = function() { return position.column + 1; };
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frame.getScriptNameOrSourceURL = function() { return position.source; };
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return frame;
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}
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// Code called using eval() needs special handling
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var origin = frame.isEval() && frame.getEvalOrigin();
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if (origin) {
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origin = mapEvalOrigin(origin);
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frame = cloneCallSite(frame);
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frame.getEvalOrigin = function() { return origin; };
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return frame;
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}
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// If we get here then we were unable to change the source position
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return frame;
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}
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// This function is part of the V8 stack trace API, for more info see:
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// https://v8.dev/docs/stack-trace-api
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function prepareStackTrace(error, stack) {
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if (emptyCacheBetweenOperations) {
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fileContentsCache = {};
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sourceMapCache = {};
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}
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var name = error.name || 'Error';
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var message = error.message || '';
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var errorString = name + ": " + message;
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return errorString + stack.map(function(frame) {
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return '\n at ' + wrapCallSite(frame);
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}).join('');
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}
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// Generate position and snippet of original source with pointer
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function getErrorSource(error) {
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var match = /\n at [^(]+ \((.*):(\d+):(\d+)\)/.exec(error.stack);
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if (match) {
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var source = match[1];
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var line = +match[2];
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var column = +match[3];
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// Support the inline sourceContents inside the source map
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var contents = fileContentsCache[source];
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// Support files on disk
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if (!contents && fs && fs.existsSync(source)) {
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try {
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contents = fs.readFileSync(source, 'utf8');
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} catch (er) {
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contents = '';
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}
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}
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// Format the line from the original source code like node does
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if (contents) {
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var code = contents.split(/(?:\r\n|\r|\n)/)[line - 1];
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if (code) {
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return source + ':' + line + '\n' + code + '\n' +
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new Array(column).join(' ') + '^';
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}
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}
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}
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return null;
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}
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function printErrorAndExit (error) {
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var source = getErrorSource(error);
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// Ensure error is printed synchronously and not truncated
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if (process.stderr._handle && process.stderr._handle.setBlocking) {
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process.stderr._handle.setBlocking(true);
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}
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if (source) {
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console.error();
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console.error(source);
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}
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console.error(error.stack);
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process.exit(1);
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}
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function shimEmitUncaughtException () {
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var origEmit = process.emit;
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process.emit = function (type) {
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if (type === 'uncaughtException') {
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var hasStack = (arguments[1] && arguments[1].stack);
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var hasListeners = (this.listeners(type).length > 0);
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if (hasStack && !hasListeners) {
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return printErrorAndExit(arguments[1]);
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}
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}
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return origEmit.apply(this, arguments);
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};
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}
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var originalRetrieveFileHandlers = retrieveFileHandlers.slice(0);
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var originalRetrieveMapHandlers = retrieveMapHandlers.slice(0);
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exports.wrapCallSite = wrapCallSite;
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exports.getErrorSource = getErrorSource;
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exports.mapSourcePosition = mapSourcePosition;
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exports.retrieveSourceMap = retrieveSourceMap;
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exports.install = function(options) {
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options = options || {};
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if (options.environment) {
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environment = options.environment;
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if (["node", "browser", "auto"].indexOf(environment) === -1) {
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throw new Error("environment " + environment + " was unknown. Available options are {auto, browser, node}")
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}
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}
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// Allow sources to be found by methods other than reading the files
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// directly from disk.
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if (options.retrieveFile) {
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if (options.overrideRetrieveFile) {
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retrieveFileHandlers.length = 0;
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}
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retrieveFileHandlers.unshift(options.retrieveFile);
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}
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// Allow source maps to be found by methods other than reading the files
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// directly from disk.
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if (options.retrieveSourceMap) {
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if (options.overrideRetrieveSourceMap) {
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retrieveMapHandlers.length = 0;
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}
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retrieveMapHandlers.unshift(options.retrieveSourceMap);
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}
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// Support runtime transpilers that include inline source maps
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if (options.hookRequire && !isInBrowser()) {
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var Module;
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try {
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Module = require('module');
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} catch (err) {
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// NOP: Loading in catch block to convert webpack error to warning.
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}
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var $compile = Module.prototype._compile;
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if (!$compile.__sourceMapSupport) {
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Module.prototype._compile = function(content, filename) {
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fileContentsCache[filename] = content;
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sourceMapCache[filename] = undefined;
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return $compile.call(this, content, filename);
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};
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Module.prototype._compile.__sourceMapSupport = true;
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}
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}
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// Configure options
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if (!emptyCacheBetweenOperations) {
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emptyCacheBetweenOperations = 'emptyCacheBetweenOperations' in options ?
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|
options.emptyCacheBetweenOperations : false;
|
|
}
|
|
|
|
// Install the error reformatter
|
|
if (!errorFormatterInstalled) {
|
|
errorFormatterInstalled = true;
|
|
Error.prepareStackTrace = prepareStackTrace;
|
|
}
|
|
|
|
if (!uncaughtShimInstalled) {
|
|
var installHandler = 'handleUncaughtExceptions' in options ?
|
|
options.handleUncaughtExceptions : true;
|
|
|
|
// Provide the option to not install the uncaught exception handler. This is
|
|
// to support other uncaught exception handlers (in test frameworks, for
|
|
// example). If this handler is not installed and there are no other uncaught
|
|
// exception handlers, uncaught exceptions will be caught by node's built-in
|
|
// exception handler and the process will still be terminated. However, the
|
|
// generated JavaScript code will be shown above the stack trace instead of
|
|
// the original source code.
|
|
if (installHandler && hasGlobalProcessEventEmitter()) {
|
|
uncaughtShimInstalled = true;
|
|
shimEmitUncaughtException();
|
|
}
|
|
}
|
|
};
|
|
|
|
exports.resetRetrieveHandlers = function() {
|
|
retrieveFileHandlers.length = 0;
|
|
retrieveMapHandlers.length = 0;
|
|
|
|
retrieveFileHandlers = originalRetrieveFileHandlers.slice(0);
|
|
retrieveMapHandlers = originalRetrieveMapHandlers.slice(0);
|
|
|
|
retrieveSourceMap = handlerExec(retrieveMapHandlers);
|
|
retrieveFile = handlerExec(retrieveFileHandlers);
|
|
}
|