Change analyzer_cli's "package mode" into a "build mode".

pkg/analyzer/lib/src/generated/source_io.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 analyzer.src.generated.source_io;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_core.dart';
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     if (path == null ||
         path.length <= 0 ||
         path.codeUnitAt(path.length - 1) == JavaFile.separatorChar) {
       return path;
     }
     return "$path${JavaFile.separator}";
   }
 }
 
 /**
+ * Instances of the class [ExplicitSourceResolver] map URIs to files on disk
+ * using a fixed mapping provided at construction time.
+ */
+class ExplicitSourceResolver extends UriResolver {
+  final Map<Uri, JavaFile> uriToFileMap;
+  final Map<String, Uri> pathToUriMap;
+
+  /**
+   * Construct an [ExplicitSourceResolver] based on the given [uriToFileMap].
+   */
+  ExplicitSourceResolver(Map<Uri, JavaFile> uriToFileMap)
+      : uriToFileMap = uriToFileMap,
+        pathToUriMap = _computePathToUriMap(uriToFileMap);
+
+  @override
+  Source resolveAbsolute(Uri uri, [Uri actualUri]) {
+    return new FileBasedSource(uriToFileMap[uri], actualUri ?? uri);
+  }
+
+  @override
+  Uri restoreAbsolute(Source source) {
+    return pathToUriMap[source.fullName];
+  }
+
+  /**
+   * Build the inverse mapping of [uriToSourceMap].
+   */
+  static Map<String, Uri> _computePathToUriMap(
+      Map<Uri, JavaFile> uriToSourceMap) {
+    Map<String, Uri> pathToUriMap = <String, Uri>{};
+    uriToSourceMap.forEach((Uri uri, JavaFile file) {
+      pathToUriMap[file.getAbsolutePath()] = uri;
+    });
+    return pathToUriMap;
+  }
+}
+
+/**
  * Instances of the class `FileBasedSource` implement a source that represents a file.
  */
 class FileBasedSource extends Source {
   /**
    * A function that changes the way that files are read off of disk.
    */
   static Function fileReadMode = (String s) => s;
 
   /**
    * Map from encoded URI/filepath pair to a unique integer identifier.  This
@@ skipping 446 matching lines @@
   }
 
   /**
    * Return `true` if the given URI is a `file` URI.
    *
    * @param uri the URI being tested
    * @return `true` if the given URI is a `file` URI
    */
   static bool isFileUri(Uri uri) => uri.scheme == FILE_SCHEME;
 }