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vscode-react-native/src/debugger

src/debugger/sourceMap.ts

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9f036952Nisheet Jain10 years ago1// Copyright (c) Microsoft Corporation. All rights reserved.
2// Licensed under the MIT license. See LICENSE file in the project root for details.
3
876df2a0dlebu10 years ago4import url = require("url");
5import path = require("path");
48644043Dmitry Zinovyev9 years ago6import { SourceMapsCombinator } from "./sourceMapsCombinator";
70bb7c83Vladimir Kotikov8 years ago7import { RawSourceMap } from "source-map";
876df2a0dlebu10 years ago8
66b52ec9Artem Egorov8 years ago9const IS_REMOTE = /^[a-zA-z]{2,}:\/\//; // Detection remote sources or specific protocols (like "webpack:///")
10
70bb7c83Vladimir Kotikov8 years ago11interface ISourceMap extends RawSourceMap {
f16656e9frogcjn9 years ago12sections?: ISourceMapSection[];
13}
14interface ISourceMapSection {
15map: ISourceMap;
16offset: { column: number, line: number };
876df2a0dlebu10 years ago17}
18
19export class SourceMapUtil {
c205b801Vladimir Kotikov9 years ago20private static SourceMapURLRegex: RegExp = /\/\/(#|@) sourceMappingURL=((?!data:).+?)\s*$/m;
4e7a6f0edlebu10 years ago21
876df2a0dlebu10 years ago22/**
23* Given a script body and URL, this method parses the body and finds the corresponding source map URL.
24* If the source map URL is not found in the body in the expected form, null is returned.
25*/
26public getSourceMapURL(scriptUrl: url.Url, scriptBody: string): url.Url {
27let result: url.Url = null;
28
29// scriptUrl = "http://localhost:8081/index.ios.bundle?platform=ios&dev=true"
30let sourceMappingRelativeUrl = this.getSourceMapRelativeUrl(scriptBody); // sourceMappingRelativeUrl = "/index.ios.map?platform=ios&dev=true"
31if (sourceMappingRelativeUrl) {
32let sourceMappingUrl = url.parse(sourceMappingRelativeUrl);
33sourceMappingUrl.protocol = scriptUrl.protocol;
34sourceMappingUrl.host = scriptUrl.host;
35// parse() repopulates all the properties of the URL
36result = url.parse(url.format(sourceMappingUrl));
37}
38
39return result;
40}
41
42/**
43* Updates the contents of a source map file to be VS Code friendly:
44* - makes source paths unix style and relative to the sources root path
45* - updates the url of the script file
46* - deletes the script content from the source map
47*
48* @parameter sourceMapBody - body of the source map as generated by the RN Packager.
49* @parameter scriptPath - path of the script file asssociated with this source map.
50* @parameter sourcesRootPath - root path of sources
51*
52*/
53public updateSourceMapFile(sourceMapBody: string, scriptPath: string, sourcesRootPath: string): string {
54try {
55let sourceMap = <ISourceMap>JSON.parse(sourceMapBody);
f16656e9frogcjn9 years ago56
57if (sourceMap.sections) {
58
59// TODO: there is a need to handle value.map == null, make a fake map
60sourceMap.sections = sourceMap.sections.filter((value, index, array) => {
61return value.map != null;
62});
63
64sourceMap = require("flatten-source-map")(sourceMap);
65}
66
48644043Dmitry Zinovyev9 years ago67let sourceMapsCombinator = new SourceMapsCombinator();
68sourceMap = sourceMapsCombinator.convert(sourceMap);
69
f16656e9frogcjn9 years ago70if (sourceMap.sources) {
71sourceMap.sources = sourceMap.sources.map(sourcePath => {
66b52ec9Artem Egorov8 years ago72return IS_REMOTE.test(sourcePath) ? sourcePath : this.updateSourceMapPath(sourcePath, sourcesRootPath);
f16656e9frogcjn9 years ago73});
74}
876df2a0dlebu10 years ago75
76delete sourceMap.sourcesContent;
77sourceMap.sourceRoot = "";
78sourceMap.file = scriptPath;
79return JSON.stringify(sourceMap);
80} catch (exception) {
81return sourceMapBody;
82}
83}
84
3736c251dlebu10 years ago85/**
86* Updates source map URLs in the script body.
87*/
88public updateScriptPaths(scriptBody: string, sourceMappingUrl: url.Url) {
89// Update the body with the new location of the source map on storage.
90return scriptBody.replace(SourceMapUtil.SourceMapURLRegex,
91"//# sourceMappingURL=" + path.basename(sourceMappingUrl.pathname));
92}
93
876df2a0dlebu10 years ago94/**
95* Given an absolute source path, this method does two things:
96* 1. It changes the path from absolute to be relative to the sourcesRootPath parameter.
97* 2. It changes the path separators to Unix style.
98*/
99private updateSourceMapPath(sourcePath: string, sourcesRootPath: string) {
100let relativeSourcePath = path.relative(sourcesRootPath, sourcePath);
101return this.makeUnixStylePath(relativeSourcePath);
102}
103
104/**
105* Visual Studio Code source mapping requires Unix style path separators.
106* This method replaces all back-slash characters in a given string with forward-slash ones.
107*/
108private makeUnixStylePath(p: string): string {
4e7a6f0edlebu10 years ago109let pathArgs = p.split(path.sep);
110return path.posix.join.apply(null, pathArgs);
876df2a0dlebu10 years ago111}
112
113/**
114* Parses the body of a script searching for a source map URL.
115* It supports the following source map url styles:
116* //# sourceMappingURL=path/to/source/map
117* //@ sourceMappingURL=path/to/source/map
118*
119* Returns the first match if found, null otherwise.
120*/
121private getSourceMapRelativeUrl(body: string) {
4e7a6f0edlebu10 years ago122let match = body.match(SourceMapUtil.SourceMapURLRegex);
876df2a0dlebu10 years ago123// If match is null, the body doesn't contain the source map
124return match ? match[2] : null;
125}
126
3736c251dlebu10 years ago127
f16656e9frogcjn9 years ago128}