Move PackageMapUriResolver into analyzer.

pkg/analysis_server/lib/src/package_uri_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 resolver.package;
-
-import 'package:analyzer/file_system/file_system.dart';
-import 'package:analyzer/src/generated/source.dart';
-
-
-/**
- * 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);
-
-  @override
-  Source fromEncoding(UriKind kind, Uri uri) {
-    if (kind == UriKind.PACKAGE_URI) {
-      Resource resource = resourceProvider.getResource(uri.path);
-      if (resource is File) {
-        return resource.createSource(kind);
-      }
-    }
-    return null;
-  }
-
-  @override
-  Source resolveAbsolute(Uri uri) {
-    if (!isPackageUri(uri)) {
-      return null;
-    }
-    // Prepare path.
-    String path = uri.path;
-    // Prepare path components.
-    String pkgName;
-    String relPath;
-    int index = path.indexOf('/');
-    if (index == -1 || index == 0) {
-      return null;
-    } else {
-      // <pkgName>/<relPath>
-      pkgName = path.substring(0, index);
-      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(UriKind.PACKAGE_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).
-    // TODO(scheglov) move NonExistingSource to "source.dart"
-    return new NonExistingSource(uri.toString(), UriKind.PACKAGE_URI);
-  }
-
-  /**
-   * Returns `true` if [uri] is a `package` URI.
-   */
-  static bool isPackageUri(Uri uri) {
-    return uri.scheme == PACKAGE_SCHEME;
-  }
-}