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| //#!/usr/bin/env node
var doc = [
'Analyze and debug space usage through source maps.',
'',
'Usage:',
' source-map-explorer <script.js> [<script.js.map>]',
' source-map-explorer [--json | --html | --tsv] <script.js> [<script.js.map>] [--replace=BEFORE --with=AFTER]... [--noroot]',
' source-map-explorer -h | --help | --version',
'',
'If the script file has an inline source map, you may omit the map parameter.',
'',
'Options:',
' -h --help Show this screen.',
' --version Show version.',
'',
' --json Output JSON (on stdout) instead of generating HTML',
' and opening the browser.',
' --tsv Output TSV (on stdout) instead of generating HTML',
' and opening the browser.',
' --html Output HTML (on stdout) rather than opening a browser.',
'',
' --noroot To simplify the visualization, source-map-explorer',
' will remove any prefix shared by all sources. If you',
' wish to disable this behavior, set --noroot.',
'',
' --replace=BEFORE Apply a simple find/replace on source file',
' names. This can be used to fix some oddities',
' with paths which appear in the source map',
' generation process. Accepts regular expressions.',
' --with=AFTER See --replace.',
].join('\n');
var fs = require('fs'),
path = require('path'),
sourcemap = require('source-map'),
convert = require('convert-source-map'),
temp = require('temp'),
open = require('open'),
_ = require('underscore'),
docopt = require('docopt').docopt,
fileURL = require('file-url'),
btoa = require('btoa');
function computeGeneratedFileSizes(mapConsumer, generatedJs) {
var lines = generatedJs.split('\n');
var sourceExtrema = {}; // source -> {min: num, max: num}
var numChars = 0;
var lastSource = null;
for (var line = 1; line <= lines.length; line++) {
var lineText = lines[line - 1];
var numCols = lineText.length;
for (var column = 0; column < numCols; column++, numChars++) {
var pos = mapConsumer.originalPositionFor({line:line, column:column});
var source = pos.source;
if (source == null) {
// Often this is from the '// #sourceMap' comment itself.
continue;
}
if (source != lastSource) {
if (!(source in sourceExtrema)) {
sourceExtrema[source] = {min: numChars};
lastSource = source;
} else {
// source-map reports odd positions for bits between files.
}
} else {
sourceExtrema[source].max = numChars;
}
}
}
return _.mapObject(sourceExtrema, function(v) {
return v.max - v.min + 1
});
}
var SOURCE_MAP_INFO_URL = 'https://github.com/danvk/source-map-explorer/blob/master/README.md#generating-source-maps';
function loadSourceMap(jsFile, mapFile) {
var jsData = fs.readFileSync(jsFile).toString();
var mapConsumer;
if (mapFile) {
var sourcemapData = fs.readFileSync(mapFile).toString();
mapConsumer = new sourcemap.SourceMapConsumer(sourcemapData);
} else {
// Try to read a source map from a 'sourceMappingURL' comment.
var converter = convert.fromSource(jsData);
if (!converter) {
converter = convert.fromMapFileSource(jsData, path.dirname(jsFile));
}
if (!converter) {
console.error('Unable to find a source map.');
console.error('See ', SOURCE_MAP_INFO_URL);
return null;
}
mapConsumer = new sourcemap.SourceMapConsumer(converter.toJSON());
}
if (!mapConsumer) {
console.error('Unable to find a source map.');
console.error('See ', SOURCE_MAP_INFO_URL);
return null;
}
return {
mapConsumer: mapConsumer,
jsData: jsData
};
}
// See http://stackoverflow.com/a/1917041/388951
function commonPathPrefix(array){
if (array.length == 0) return '';
var A= array.concat().sort(),
a1= A[0].split(/(\/)/), a2= A[A.length-1].split(/(\/)/), L= a1.length, i= 0;
while(i<L && a1[i] === a2[i]) i++;
return a1.slice(0, i).join('');
}
// Apply a transform to the keys of an object, leaving the values unaffected.
function mapKeys(obj, fn) {
return _.object(_.map(obj, function(v, k) { return [fn(k), v]; }));
}
function adjustSourcePaths(sizes, findRoot, finds, replaces) {
if (findRoot) {
var prefix = commonPathPrefix(_.keys(sizes));
var len = prefix.length;
if (len) {
sizes = mapKeys(sizes, function(source) { return source.slice(len); })
}
}
for (var i = 0; i < finds.length; i++) {
var before = new RegExp(finds[i]),
after = replaces[i];
sizes = mapKeys(sizes, function(source) {
return source.replace(before, after);
});
}
return sizes;
}
function validateArgs(args) {
if (args['--replace'].length != args['--with'].length) {
console.error('--replace flags must be paired with --with flags.');
process.exit(1);
}
}
Iif (require.main === module) {
var args = docopt(doc, {version: '1.3.3'});
validateArgs(args);
var data = loadSourceMap(args['<script.js>'], args['<script.js.map>']);
if (!data) {
process.exit(1);
}
var mapConsumer = data.mapConsumer,
jsData = data.jsData;
var sizes = computeGeneratedFileSizes(mapConsumer, jsData);
if (_.size(sizes) == 1) {
console.error('Your source map only contains one source (',
_.keys(sizes)[0], ')');
console.error("This typically means that your source map doesn't map all the way back to the original sources.");
console.error("This can happen if you use browserify+uglifyjs, for example, and don't set the --in-source-map flag to uglify.");
console.error('See ', SOURCE_MAP_INFO_URL);
process.exit(1);
}
sizes = adjustSourcePaths(sizes, !args['--noroot'], args['--replace'], args['--with']);
if (args['--json']) {
console.log(JSON.stringify(sizes, null, ' '));
process.exit(0);
}
if (args['--tsv']) {
console.log('Source\tSize');
_.each(sizes, function(source, size) { console.log(size + '\t' + source); })
process.exit(0);
}
var assets = {
underscoreJs: btoa(fs.readFileSync(require.resolve('underscore'))),
prettyBytesJs: btoa(fs.readFileSync(require.resolve('./vendor/prettybytes.js'))),
webtreemapJs: btoa(fs.readFileSync(require.resolve('./vendor/webtreemap.js'))),
webtreemapCss: btoa(fs.readFileSync(require.resolve('./vendor/webtreemap.css'))),
};
var html = fs.readFileSync(path.join(__dirname, 'tree-viz.html')).toString();
html = html.replace('INSERT TREE HERE', JSON.stringify(sizes, null, ' '))
.replace('INSERT TITLE HERE', args['<script.js>'])
.replace('INSERT underscore.js HERE', 'data:application/javascript;base64,' + assets.underscoreJs)
.replace('INSERT prettybytes.js HERE', 'data:application/javascript;base64,' + assets.prettyBytesJs)
.replace('INSERT webtreemap.js HERE', 'data:application/javascript;base64,' + assets.webtreemapJs)
.replace('INSERT webtreemap.css HERE', 'data:text/css;base64,' + assets.webtreemapCss);
if (args['--html']) {
console.log(html);
process.exit(0);
}
var tempName = temp.path({suffix: '.html'});
fs.writeFileSync(tempName, html);
open(tempName, function(error) {
if (!error) return;
console.error('Unable to open web browser.');
console.error('Either run with --html, --json or --tsv, or view HTML for the visualization at:');
console.error(tempName);
});
}
// Exports are here mostly for testing.
module.exports = {
loadSourceMap: loadSourceMap,
computeGeneratedFileSizes: computeGeneratedFileSizes,
adjustSourcePaths: adjustSourcePaths,
mapKeys: mapKeys,
commonPathPrefix: commonPathPrefix
};
|