Add scripts for downloading open source corpora.

.github/workflows/dart.yml

@@ -24,6 +24,9 @@ jobs:
       - name: dart pub get (working/macros/example)
         run: dart pub get
         working-directory: working/macros/example
+      - name: dart pub get (tools/corpus)
+        run: dart pub get
+        working-directory: tools/corpus/scripts
       - name: dart pub get (accepted/2.3/spread-collections/benchmarks)
         run: dart pub get
         working-directory: accepted/2.3/spread-collections/benchmarks

tools/corpus/.gitignore

@@ -0,0 +1,3 @@
+# Don't commit the downloaded files.
+download/
+out/

tools/corpus/README.md

@@ -0,0 +1,25 @@
+This directory contains a package with scripts for downloading corpora of open
+source Dart code for automated analysis. There are a few scripts for
+downloading from various places:
+
+*   `clone_flutter_apps.dart`: Clones GitHub repositories linked to from
+    [github.com/tortuvshin/open-source-flutter-apps](https://github.com/tortuvshin/open-source-flutter-apps), which is a registry of open source Flutter apps.
+    Downloads them to `download/apps`.
+
+*   `clone_widgets.apps.dart`: Clones GitHub repositories referenced by
+    [itsallwidgets.com](https://itsallwidgets.com/), which is a collection of
+    open source Flutter apps and widgets. Downloads them to `download/widgets`.
+
+*   `download_packages.dart`: Downloads recent packages from
+    [pub.dev](https://pub.dev/). Downloads to `download/pub`.
+
+Once a corpus is downloaded, there is another script that copies over just the
+`.dart` files while discardinging "uninteresting" files like generated ones:
+
+*   `copy_corpus.dart`: Copies `.dart` files from one of the download
+    directories. Pass `apps`, `widgets`, `pub`, etc. Can also copy sources from
+    the Dart SDK repo (`dart`) or Flutter repo (`flutter`). For that to work,
+    those repos must be in directories next to the language repo.
+
+    You can pass `--sample=<percent>` to take a random sample of a corpus. For
+    example, `--sample=5` will copy over only 5% of the files, chosen randomly.

tools/corpus/scripts/bin/clone_flutter_apps.dart

@@ -0,0 +1,39 @@
+import 'package:corpus/utils.dart';
+
+/// Match URIs that point to GitHub repos. Look for a trailing ")" (after an
+/// allowed trailing "/") in order to only find Markdown link URIs that are
+/// directly to repos and not to paths within them like the images in the
+/// header.
+final _gitHubRepoPattern =
+    RegExp(r'https://github.com/([a-zA-Z0-9_-]+)/([a-zA-Z0-9_-]+)/?\)');
+
+const _readmeUri =
+    'https://raw.githubusercontent.com/tortuvshin/open-source-flutter-apps/'
+    'refs/heads/master/README.md';
+
+/// Clones the GitHub repos listed on:
+///
+/// https://github.com/tortuvshin/open-source-flutter-apps
+///
+/// Downloads them to downloads/apps.
+void main(List<String> arguments) async {
+  clean('download/apps');
+
+  print('Getting README.md...');
+  var readme = await httpGet(_readmeUri);
+
+  // Find all the repo URLs and remove the duplicates.
+  var repoPaths = _gitHubRepoPattern
+      .allMatches(readme)
+      .map((match) => (user: match[1]!, repo: match[2]!))
+      .toSet()
+      .toList();
+
+  // Skip the reference to the repo itself.
+  repoPaths.remove((user: 'tortuvshin', repo: 'open-source-flutter-apps'));
+
+  var downloader = Downloader(totalResources: repoPaths.length, concurrency: 5);
+  for (var (:user, :repo) in repoPaths) {
+    downloader.cloneGitHubRepo('apps', user, repo);
+  }
+}

tools/corpus/scripts/bin/clone_widgets.dart

@@ -0,0 +1,34 @@
+import 'package:corpus/utils.dart';
+
+/// Match URIs that point to GitHub repos.
+final _gitHubRepoPattern =
+    RegExp(r'https://github.com/([a-zA-Z0-9_-]+)/([a-zA-Z0-9_-]+)');
+
+/// Download open source apps from itsallwidgets.com.
+void main(List<String> arguments) async {
+  clean("download/widgets");
+
+  print('Getting page feed...');
+  var feed =
+      await httpGetJson('https://itsallwidgets.com/feed?open_source=true');
+
+  var repos = <({String user, String repo})>{};
+  for (var entry in (feed as List<Object?>)) {
+    var entryMap = entry as Map<String, Object?>;
+    if (entryMap['type'] != 'app') continue;
+
+    var repo = entryMap['repo_url'] as String?;
+    if (repo == null) continue;
+
+    // Only know how to download from GitHub. There are a couple of BitBucket
+    // ones in there.
+    if (_gitHubRepoPattern.firstMatch(repo) case var match?) {
+      repos.add((user: match[1]!, repo: match[2]!));
+    }
+  }
+
+  var downloader = Downloader(totalResources: repos.length, concurrency: 10);
+  for (var (:user, :repo) in repos) {
+    downloader.cloneGitHubRepo('widgets', user, repo);
+  }
+}

tools/corpus/scripts/bin/copy_corpus.dart

@@ -0,0 +1,92 @@
+import 'dart:io';
+import 'dart:math';
+
+import 'package:args/args.dart';
+import 'package:path/path.dart' as p;
+
+/// What percentage of files should be copied over. Used to take a random
+/// sample of a corpus.
+int _samplePercent = 100;
+
+final _random = Random();
+
+const _ignoreDirs = [
+  'pkg/dev_compiler/gen/',
+  'tests/co19/',
+  'third_party/observatory_pub_packages/',
+  'tools/sdks/',
+  'out/',
+  'xcodebuild/',
+
+  // Redundant stuff in Flutter.
+  'bin/cache/',
+
+  // Redundant packages that are in the SDK.
+  'analyzer-',
+  'compiler_unsupported-',
+  'dev_compiler-',
+];
+
+// Note! Assumes the Dart SDK and Flutter repos have been cloned in
+// directories next to the corpus repo. Also assumes this script has been run
+// from the root directory of this repo.
+const _corpora = [
+  ('apps', 'download/apps'),
+  ('dart', '../../../dart/sdk'),
+  ('flutter', '../../../flutter'),
+  ('pub', 'download/pub'),
+  ('widgets', 'download/widgets'),
+];
+
+final generatedSuffixes = ['.g.dart', '.freezed.dart'];
+
+void main(List<String> arguments) async {
+  var argParser = ArgParser();
+  argParser.addFlag('omit-slow');
+  argParser.addOption('sample', abbr: 's', defaultsTo: '100');
+
+  var argResults = argParser.parse(arguments);
+  _samplePercent = int.parse(argResults['sample']);
+
+  for (var (name, directory) in _corpora) {
+    if (arguments.contains(name)) await copyDir(directory, name);
+  }
+}
+
+Future<void> copyDir(String fromDirectory, String toDirectory) async {
+  // If we're taking a random sample, put that in a separate directory.
+  if (_samplePercent != 100) {
+    toDirectory += '-$_samplePercent';
+  }
+
+  var i = 0;
+  var inDir = Directory(fromDirectory);
+
+  await inDir.list(recursive: true, followLinks: false).listen((entry) async {
+    var relative = p.relative(entry.path, from: inDir.path);
+
+    if (entry is Link) return;
+    if (entry is! File || !entry.path.endsWith('.dart')) return;
+
+    // Skip redundant stuff.
+    for (var ignore in _ignoreDirs) {
+      if (relative.startsWith(ignore)) return;
+    }
+
+    if (_random.nextInt(100) >= _samplePercent) return;
+
+    // If the path is in a subdirectory starting with '.', ignore it.
+    var parts = p.split(relative);
+    if (parts.any((part) => part.startsWith('.'))) return;
+
+    var outPath = p.join('out', toDirectory, relative);
+
+    var outDir = Directory(p.dirname(outPath));
+    if (!await outDir.exists()) await outDir.create(recursive: true);
+
+    await entry.copy(outPath);
+
+    i++;
+    if (i % 100 == 0) print(relative);
+  }).asFuture();
+}

tools/corpus/scripts/bin/download_packages.dart

@@ -0,0 +1,57 @@
+import 'dart:io';
+
+import 'package:corpus/utils.dart';
+
+const _totalPackages = 2000;
+
+void main(List<String> arguments) async {
+  clean('download/pub');
+
+  // Iterate through the pages (which are in most recent order) until we get
+  // enough packages.
+  var packagePage = 'http://pub.dartlang.org/api/packages';
+  var downloaded = 1;
+
+  var downloader = Downloader(totalResources: _totalPackages);
+  for (;;) {
+    downloader.log('Getting index page $downloaded...');
+    var packages = await httpGetJson(packagePage);
+
+    for (var package in packages['packages']) {
+      downloader.withResource((logger) async {
+        var name = package['name'] as String;
+        var version = package['latest']['version'] as String;
+        var archiveUrl = package['latest']['archive_url'] as String;
+
+        try {
+          logger.begin('Downloading $archiveUrl...');
+          var archiveBytes = await httpGetBytes(archiveUrl);
+          var tarFile = 'download/pub/$name-$version.tar.gz';
+          await File(tarFile).writeAsBytes(archiveBytes);
+
+          logger.log('Extracting $tarFile...');
+          var outputDir = 'download/pub/$name-$version';
+          await Directory(outputDir).create(recursive: true);
+          var result =
+              await Process.run('tar', ['-xf', tarFile, '-C', outputDir]);
+
+          if (result.exitCode != 0) {
+            logger.end('Could not extract $tarFile:\n${result.stderr}');
+          } else {
+            await File(tarFile).delete();
+            logger.end('Finished $outputDir');
+          }
+        } catch (error) {
+          logger.end('Error downloading $archiveUrl:\n$error');
+        }
+      });
+
+      downloaded++;
+      if (downloaded >= _totalPackages) return;
+    }
+
+    var nextUrl = packages['next_url'];
+    if (nextUrl is! String) break;
+    packagePage = nextUrl;
+  }
+}