Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/analyzer/lib/source/package_map_resolver.dart

+// 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 source.package_map_resolver;
+
+import 'dart:core' hide Resource;
+
+import 'package:analyzer/file_system/file_system.dart';
+import 'package:analyzer/src/generated/source.dart';
+import 'package:analyzer/src/util/asserts.dart' as asserts;
+import 'package:path/path.dart' as pathos;
+
+/**
+ * A [UriResolver] implementation for the `package:` scheme that uses a map of
+ * package names to their directories.
+ */
+class PackageMapUriResolver extends UriResolver {
+  /**
+   * The name of the `package` scheme.
+   */
+  static const String PACKAGE_SCHEME = "package";
+
+  /**
+   * A table mapping package names to the path of the directories containing
+   * the package.
+   */
+  final Map<String, List<Folder>> packageMap;
+
+  /**
+   * The [ResourceProvider] for this resolver.
+   */
+  final ResourceProvider resourceProvider;
+
+  /**
+   * Create a new [PackageMapUriResolver].
+   *
+   * [packageMap] is a table mapping package names to the paths of the
+   * directories containing the package
+   */
+  PackageMapUriResolver(this.resourceProvider, this.packageMap) {
+    asserts.notNull(resourceProvider);
+    asserts.notNull(packageMap);
+  }
+
+  @override
+  Source resolveAbsolute(Uri uri, [Uri actualUri]) {
+    if (!isPackageUri(uri)) {
+      return null;
+    }
+    // Prepare path.
+    String path = uri.path;
+    // Prepare path components.
+    int index = path.indexOf('/');
+    if (index == -1 || index == 0) {
+      return null;
+    }
+    // <pkgName>/<relPath>
+    String pkgName = path.substring(0, index);
+    String relPath = path.substring(index + 1);
+    // Try to find an existing file.
+    List<Folder> packageDirs = packageMap[pkgName];
+    if (packageDirs != null) {
+      for (Folder packageDir in packageDirs) {
+        if (packageDir.exists) {
+          Resource result = packageDir.getChild(relPath);
+          if (result is File && result.exists) {
+            return result.createSource(uri);
+          }
+        }
+      }
+    }
+    // Return a NonExistingSource instance.
+    // This helps provide more meaningful error messages to users
+    // (a missing file error, as opposed to an invalid URI error).
+    String fullPath = packageDirs != null && packageDirs.isNotEmpty
+        ? packageDirs.first.canonicalizePath(relPath)
+        : relPath;
+    return new NonExistingSource(fullPath, uri, UriKind.PACKAGE_URI);
+  }
+
+  @override
+  Uri restoreAbsolute(Source source) {
+    String sourcePath = source.fullName;
+    Uri bestMatch;
+    int bestMatchLength = -1;
+    pathos.Context pathContext = resourceProvider.pathContext;
+    for (String pkgName in packageMap.keys) {
+      List<Folder> pkgFolders = packageMap[pkgName];
+      for (int i = 0; i < pkgFolders.length; i++) {
+        Folder pkgFolder = pkgFolders[i];
+        String pkgFolderPath = pkgFolder.path;
+        if (pkgFolderPath.length > bestMatchLength &&
+            sourcePath.startsWith(pkgFolderPath + pathContext.separator)) {
+          String relPath = sourcePath.substring(pkgFolderPath.length + 1);
+          if (_isReversibleTranslation(pkgFolders, i, relPath)) {
+            List<String> relPathComponents = pathContext.split(relPath);
+            String relUriPath = pathos.posix.joinAll(relPathComponents);
+            bestMatch = Uri.parse('$PACKAGE_SCHEME:$pkgName/$relUriPath');
+            bestMatchLength = pkgFolderPath.length;
+          }
+        }
+      }
+    }
+    return bestMatch;
+  }
+
+  /**
+   * A translation from file path to package URI has just been found for
+   * using the [packageDirIndex]th element of [packageDirs], and appending the
+   * relative path [relPath].  Determine whether the translation is reversible;
+   * that is, whether translating the package URI pack to a file path will
+   * produce the file path we started with.
+   */
+  bool _isReversibleTranslation(
+      List<Folder> packageDirs, int packageDirIndex, String relPath) {
+    // The translation is reversible provided there is no prior element of
+    // [packageDirs] containing a file matching [relPath].
+    for (int i = 0; i < packageDirIndex; i++) {
+      Folder packageDir = packageDirs[i];
+      if (packageDir.exists) {
+        Resource result = packageDir.getChild(relPath);
+        if (result is File && result.exists) {
+          return false;
+        }
+      }
+    }
+    return true;
+  }
+
+  /**
+   * Returns `true` if [uri] is a `package` URI.
+   */
+  static bool isPackageUri(Uri uri) {
+    return uri.scheme == PACKAGE_SCHEME;
+  }
+}