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import { SourceMapConsumer, MappedPosition } from "source-map";
import * as base64 from "base64-js";
interface Options {
// A callback the returns generated file contents.
getGeneratedContents: GetGeneratedContentsCallback;
// Usually set the following to true. Set to false for testing.
installPrepareStackTrace: boolean;
}
interface CallSite extends NodeJS.CallSite {
getScriptNameOrSourceURL(): string;
}
interface Position {
source: string; // Filename
column: number;
line: number;
}
type GetGeneratedContentsCallback = (fileName: string) => string;
let getGeneratedContents: GetGeneratedContentsCallback;
export function install(options: Options) {
getGeneratedContents = options.getGeneratedContents;
if (options.installPrepareStackTrace) {
Error.prepareStackTrace = prepareStackTraceWrapper;
}
}
export function prepareStackTraceWrapper(
error: Error,
stack: CallSite[]
): string {
try {
return prepareStackTrace(error, stack);
} catch (prepareStackError) {
Error.prepareStackTrace = null;
console.log("=====Error inside of prepareStackTrace====");
console.log(prepareStackError.stack.toString());
console.log("=====Original error=======================");
throw error;
}
}
export function prepareStackTrace(error: Error, stack: CallSite[]): string {
const frames = stack.map(
(frame: CallSite) => "\n at " + wrapCallSite(frame).toString()
);
return error.toString() + frames.join("");
}
export function wrapCallSite(frame: CallSite): CallSite {
if (frame.isNative()) {
return frame;
}
// Most call sites will return the source file from getFileName(), but code
// passed to eval() ending in "//# sourceURL=..." will return the source file
// from getScriptNameOrSourceURL() instead
const source = frame.getFileName() || frame.getScriptNameOrSourceURL();
if (source) {
const line = frame.getLineNumber();
const column = frame.getColumnNumber() - 1;
const position = mapSourcePosition({
source,
line,
column
});
frame = cloneCallSite(frame);
frame.getFileName = () => position.source;
frame.getLineNumber = () => position.line;
frame.getColumnNumber = () => Number(position.column) + 1;
frame.getScriptNameOrSourceURL = () => position.source;
return frame;
}
// Code called using eval() needs special handling
let origin = frame.isEval() && frame.getEvalOrigin();
if (origin) {
origin = mapEvalOrigin(origin);
frame = cloneCallSite(frame);
frame.getEvalOrigin = () => origin;
return frame;
}
// If we get here then we were unable to change the source position
return frame;
}
function cloneCallSite(frame: CallSite): CallSite {
// tslint:disable:no-any
const obj: any = {};
const frame_ = frame as any;
const props = Object.getOwnPropertyNames(Object.getPrototypeOf(frame));
props.forEach(name => {
obj[name] = /^(?:is|get|toString)/.test(name)
? () => frame_[name].call(frame)
: frame_[name];
});
return (obj as any) as CallSite;
// tslint:enable:no-any
}
// Regex for detecting source maps
const reSourceMap = /^data:application\/json[^,]+base64,/;
function loadConsumer(source: string): SourceMapConsumer {
let consumer = consumers.get(source);
if (consumer == null) {
const code = getGeneratedContents(source);
if (!code) {
return null;
}
let sourceMappingURL = retrieveSourceMapURL(code);
if (!sourceMappingURL) {
throw Error("No source map?");
}
let sourceMapData: string;
if (reSourceMap.test(sourceMappingURL)) {
// Support source map URL as a data url
const rawData = sourceMappingURL.slice(sourceMappingURL.indexOf(",") + 1);
//sourceMapData = bufferFrom(rawData, "base64").toString();
const ui8 = base64.toByteArray(rawData);
sourceMapData = arrayToStr(ui8);
sourceMappingURL = source;
} else {
// Support source map URLs relative to the source URL
//sourceMappingURL = supportRelativeURL(source, sourceMappingURL);
//sourceMapData = retrieveFile(sourceMappingURL);
}
const rawSourceMap = JSON.parse(sourceMapData);
consumer = new SourceMapConsumer(rawSourceMap);
consumers.set(source, consumer);
}
return consumer;
}
const consumers = new Map<string, SourceMapConsumer>();
function retrieveSourceMapURL(fileData: string): string {
// Get the URL of the source map
// tslint:disable-next-line:max-line-length
const re = /(?:\/\/[@#][ \t]+sourceMappingURL=([^\s'"]+?)[ \t]*$)|(?:\/\*[@#][ \t]+sourceMappingURL=([^\*]+?)[ \t]*(?:\*\/)[ \t]*$)/gm;
// Keep executing the search to find the *last* sourceMappingURL to avoid
// picking up sourceMappingURLs from comments, strings, etc.
let lastMatch, match;
while ((match = re.exec(fileData))) {
lastMatch = match;
}
if (!lastMatch) {
return null;
}
return lastMatch[1];
}
function mapSourcePosition(position: Position): MappedPosition {
const consumer = loadConsumer(position.source);
if (consumer == null) {
return position;
}
const mapped = consumer.originalPositionFor(position);
return mapped;
}
// Parses code generated by FormatEvalOrigin(), a function inside V8:
// https://code.google.com/p/v8/source/browse/trunk/src/messages.js
function mapEvalOrigin(origin: string): string {
// Most eval() calls are in this format
let match = /^eval at ([^(]+) \((.+):(\d+):(\d+)\)$/.exec(origin);
if (match) {
const position = mapSourcePosition({
source: match[2],
line: Number(match[3]),
column: Number(match[4]) - 1
});
const pos = [
position.source,
position.line,
Number(position.column) + 1
].join(":");
return `eval at ${match[1]} (${pos})`;
}
// Parse nested eval() calls using recursion
match = /^eval at ([^(]+) \((.+)\)$/.exec(origin);
if (match) {
return "eval at " + match[1] + " (" + mapEvalOrigin(match[2]) + ")";
}
// Make sure we still return useful information if we didn't find anything
return origin;
}
// TODO move to util?
function arrayToStr(ui8: Uint8Array): string {
return String.fromCharCode.apply(null, ui8);
}
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