Access to imports in the VM's runtime mirrors. Extend test coverage of the source mirrors.

sdk/lib/mirrors/mirrors.dart

 // Copyright (c) 2013, 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.
 
 // For the purposes of the mirrors library, we adopt a naming
 // convention with respect to getters and setters.  Specifically, for
 // some variable or field...
 //
 //   var myField;
 //
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    *
    *     (r1, ..., rn, [p1 = d1, ..., pk = dk]) {
    *       return this.invoke(name, [r1, ..., rn, p1, ..., pk]);
    *     }
    *
    * if m has required parameters r1, ..., rn, and optional positional
    * parameters p1, ..., pk with defaults d1, ..., dk.  Otherwise, an
    * [ArgumentError] is thrown.
    */
   Function operator [](Symbol name);
+
+  /**
+   * Returns a list of the imports and exports in this library;
+   */
+  List<LibraryDependencyMirror> get libraryDependencies;
+}
+
+/// A mirror on an import or export declaration.
+abstract class LibraryDependencyMirror {
+  /// Is `true` if this dependency is an import.
+  bool get isImport;
+
+  /// Is `true` if this dependency is an export.
+  bool get isExport;
+
+  /// Returns the library mirror of the library that imports or exports the
+  /// [targetLibrary].
+  LibraryMirror get sourceLibrary;
+
+  /// Returns the library mirror of the library that is imported or exported.
+  LibraryMirror get targetLibrary;
+
+  /// Returns the prefix if this is a prefixed import and `null` otherwise.
+  Symbol get prefix;
+
+  /// Returns the list of show/hide combinators on the import/export
+  /// declaration.
+  List<CombinatorMirror> get combinators;
+
+  /// Returns the source location for this import/export declaration.
+  SourceLocation get location;
+
+  List<InstanceMirror> get metadata;
+}
+
+/// A mirror on a show/hide combinator declared on a library dependency.
+abstract class CombinatorMirror {
+  /// The list of identifiers on the combinator.
+  List<Symbol> get identifiers;
+
+  /// Is `true` if this is a 'show' combinator.
+  bool get isShow;
+
+  /// Is `true` if this is a 'hide' combinator.
+  bool get isHide;
 }
 
 /**
  * A [TypeMirror] reflects a Dart language class, typedef,
  * function type or type variable.
  */
 abstract class TypeMirror implements DeclarationMirror {
   /**
    * An immutable list with mirrors for all type variables for this type.
    *
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    *
    * When used as metadata on an import of "dart:mirrors", this metadata does
    * not apply to the library in which the annotation is used, but instead
    * applies to the other libraries (all libraries if "*" is used).
    */
   final override;
 
   const MirrorsUsed(
       {this.symbols, this.targets, this.metaTargets, this.override});
 }