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Unified Diff: sdk/lib/_internal/pub/lib/src/cached_package.dart

Issue 583853002: Use precompiled dependencies in pub. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Code review changes Created 6 years, 3 months ago
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Index: sdk/lib/_internal/pub/lib/src/cached_package.dart
diff --git a/sdk/lib/_internal/pub/lib/src/cached_package.dart b/sdk/lib/_internal/pub/lib/src/cached_package.dart
new file mode 100644
index 0000000000000000000000000000000000000000..3dc2323689f05d2129d69dae573afdb05c1837a1
--- /dev/null
+++ b/sdk/lib/_internal/pub/lib/src/cached_package.dart
@@ -0,0 +1,82 @@
+// Copyright (c) 2014, 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.
+
+library pub.cached_package;
+
+import 'package:path/path.dart' as p;
+import 'package:yaml/yaml.dart';
+
+import 'barback/transformer_config.dart';
+import 'io.dart';
+import 'package.dart';
+import 'pubspec.dart';
+import 'version.dart';
+
+/// A [Package] whose `lib` directory has been precompiled and cached.
+///
+/// When users of this class request path information about files that are
+/// cached, this returns the cached information. It also wraps the package's
+/// pubspec to report no transformers, since the transformations have all been
+/// applied already.
+class CachedPackage extends Package {
+ /// The directory contianing the cached assets from this package.
+ ///
+ /// Although only `lib` is cached, this directory corresponds to the root of
+ /// the package. The actual cached assets exist in `$_cacheDir/lib`.
+ final String _cacheDir;
+
+ /// Creates a new cached package wrapping [inner] with the cache at
+ /// [_cacheDir].
+ CachedPackage(Package inner, this._cacheDir)
+ : super(new _CachedPubspec(inner.pubspec), inner.dir);
+
+ String path(String part1, [String part2, String part3, String part4,
+ String part5, String part6, String part7]) {
+ if (_pathInCache(part1)) {
+ return p.join(_cacheDir, part1, part2, part3, part4, part5, part6, part7);
+ } else {
+ return super.path(part1, part2, part3, part4, part5, part6, part7);
+ }
+ }
+
+ String relative(String path) {
+ if (p.isWithin(path, _cacheDir)) return p.relative(path, from: _cacheDir);
+ return super.relative(path);
+ }
+
+ /// This will include the cached, transformed versions of files if [beneath]
+ /// is within a cached directory, but not otherwise.
+ List<String> listFiles({String beneath, recursive: true}) {
+ if (beneath == null) return super.listFiles(recursive: recursive);
+
+ if (_pathInCache(beneath)) return listDir(p.join(_cacheDir, beneath));
+ return super.listFiles(beneath: beneath, recursive: recursive);
+ }
+
+ /// Returns whether [relativePath], a path relative to the package's root,
+ /// is in a cached directory.
+ bool _pathInCache(String relativePath) => p.isWithin('lib', relativePath);
+}
+
+/// A pubspec wrapper that reports no transformers.
+class _CachedPubspec implements Pubspec {
+ final Pubspec _inner;
+
+ YamlMap get fields => _inner.fields;
+ String get name => _inner.name;
+ Version get version => _inner.version;
+ List<PackageDep> get dependencies => _inner.dependencies;
+ List<PackageDep> get devDependencies => _inner.devDependencies;
+ List<PackageDep> get dependencyOverrides => _inner.dependencyOverrides;
+ PubspecEnvironment get environment => _inner.environment;
+ String get publishTo => _inner.publishTo;
+ Map<String, String> get executables => _inner.executables;
+ bool get isPrivate => _inner.isPrivate;
+ bool get isEmpty => _inner.isEmpty;
+ List<PubspecException> get allErrors => _inner.allErrors;
+
+ List<Set<TransformerConfig>> get transformers => const [];
+
+ _CachedPubspec(this._inner);
+}

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