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// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// @dart = 2.7
/// Loads a source map file and outputs a human-readable version of it.
library load;
import 'dart:convert';
import 'dart:io';
import 'package:source_maps/source_maps.dart';
void main(List<String> args) {
if (args.isEmpty) {
print('''
Usage: load <dir-containing 'out.js.map'>
or: load <source-map-file> [<human-readable-source-map-file>]''');
exit(1);
}
File humanReadableSourceMapFile;
File sourceMapFile;
if (args.length == 1 && new Directory(args[0]).existsSync()) {
humanReadableSourceMapFile = new File('${args[0]}/out.js.map2');
sourceMapFile = new File('${args[0]}/out.js.map');
} else {
sourceMapFile = new File(args[0]);
if (args.length > 1) {
humanReadableSourceMapFile = new File(args[1]);
}
}
mainInternal(sourceMapFile, humanReadableSourceMapFile);
}
void mainInternal(File sourceMapFile, File humanReadableSourceMapFile) {
SingleMapping sourceMap =
new SingleMapping.fromJson(json.decode(sourceMapFile.readAsStringSync()));
String humanReadableSourceMap = convertToHumanReadableSourceMap(sourceMap);
if (humanReadableSourceMapFile != null) {
humanReadableSourceMapFile.writeAsStringSync(humanReadableSourceMap);
} else {
print(humanReadableSourceMap);
}
}
String convertToHumanReadableSourceMap(SingleMapping sourceMap) {
StringBuffer sb = new StringBuffer();
sb.write('{\n');
sb.write(' "file": "${sourceMap.targetUrl}",\n');
sb.write(' "sourceRoot": "${sourceMap.sourceRoot}",\n');
sb.write(' "sources": {\n');
for (int index = 0; index < sourceMap.urls.length; index++) {
if (index > 0) {
sb.write(',\n');
}
sb.write(' "$index": "${sourceMap.urls[index]}"');
}
sb.write('\n },\n');
sb.write(' "lines": [\n');
bool needsComma = false;
for (int lineIndex = 0; lineIndex < sourceMap.lines.length; lineIndex++) {
TargetLineEntry lineEntry = sourceMap.lines[lineIndex];
int line = lineEntry.line + 1;
for (int entryIndex = 0;
entryIndex < lineEntry.entries.length;
entryIndex++) {
TargetEntry entry = lineEntry.entries[entryIndex];
int columnStart = entry.column + 1;
int columnEnd;
String position;
if (entryIndex + 1 < lineEntry.entries.length) {
columnEnd = lineEntry.entries[entryIndex + 1].column + 1;
position = '$line,$columnStart-$columnEnd';
} else {
position = '$line,$columnStart-';
}
if (entry.sourceUrlId != null || columnEnd == null) {
if (needsComma) {
sb.write(',\n');
}
sb.write(' {"target": "$position"');
if (entry.sourceUrlId != null) {
int sourceUrlId = entry.sourceUrlId;
int sourceLine = entry.sourceLine + 1;
int sourceColumn = entry.sourceColumn + 1;
sb.write(', "source": "$sourceUrlId:$sourceLine,$sourceColumn"');
if (entry.sourceNameId != null) {
sb.write(', "name": "${sourceMap.names[entry.sourceNameId]}"');
}
}
sb.write('}');
needsComma = true;
}
}
}
sb.write('\n ]\n');
sb.write('}');
return sb.toString();
}