rnystrom@google.com
182ae3e26c
Review URL: https://codereview.chromium.org//11093012 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@13391 260f80e4-7a28-3924-810f-c04153c831b5
74 lines
2.6 KiB
Dart
74 lines
2.6 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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library sdk_source;
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import 'io.dart';
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import 'package.dart';
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import 'pubspec.dart';
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import 'source.dart';
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import 'version.dart';
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/// A package source that uses libraries from the Dart SDK.
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class SdkSource extends Source {
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final String name = "sdk";
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final bool shouldCache = false;
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/// The root directory of the Dart SDK.
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final String _rootDir;
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String get rootDir {
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if (_rootDir != null) return _rootDir;
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throw "Pub can't find the Dart SDK. Please set the DART_SDK environment "
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"variable to the Dart SDK directory.";
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}
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SdkSource(this._rootDir);
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/// SDK packages are not individually versioned. Instead, their version is
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/// inferred from the revision number of the SDK itself.
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Future<Pubspec> describe(PackageId id) {
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var version;
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return readTextFile(join(rootDir, "revision")).chain((revision) {
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version = new Version.parse("0.0.0-r.${revision.trim()}");
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// Read the pubspec for the package's dependencies.
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return _getPackagePath(id);
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}).chain((packageDir) {
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// TODO(rnystrom): What if packageDir is null?
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return Package.load(id.name, packageDir, systemCache.sources);
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}).transform((package) {
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// Ignore the pubspec's version, and use the SDK's.
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return new Pubspec(id.name, version, package.pubspec.dependencies);
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});
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}
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/// Since all the SDK files are already available locally, installation just
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/// involves symlinking the SDK library into the packages directory.
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Future<bool> install(PackageId id, String destPath) {
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return _getPackagePath(id).chain((path) {
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if (path == null) return new Future<bool>.immediate(false);
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return createPackageSymlink(id.name, path, destPath).transform(
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(_) => true);
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});
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}
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/// Gets the path in the SDK to the directory containing package [id]. Looks
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/// inside both "pkg" and "lib" in the SDK. Returns `null` if the package
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/// could not be found.
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Future<String> _getPackagePath(PackageId id) {
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// Look in "pkg" first.
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var pkgPath = join(rootDir, "pkg", id.description);
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return exists(pkgPath).chain((found) {
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if (found) return new Future<String>.immediate(pkgPath);
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// Not in "pkg", so try "lib".
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// TODO(rnystrom): Get rid of this when all SDK packages are moved from
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// "lib" to "pkg".
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var libPath = join(rootDir, "lib", id.description);
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return exists(libPath).transform((found) => found ? libPath : null);
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});
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}
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}
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