Resolve import/export directives in analyzer itself, report non-libraries.

pkg/analyzer/lib/src/dart/analysis/analysis_impl.dart

 // Copyright (c) 2017, 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.
 
 import 'package:analyzer/context/declared_variables.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/error/listener.dart';
@@ skipping 313 matching lines @@
           if (librarySource != null) {
             return new _NameOrSource(null, librarySource);
           }
         }
       }
     }
     return null;
   }
 
   /**
+   * Return `true` if the given [source] is a library.
+   */
+  bool _isLibrarySource(Source source) {
+    String uriStr = source.uri.toString();
+    return _store.unlinkedMap[uriStr]?.isPartOf == false;
+  }
+
+  /**
    * Return a new parsed unresolved [CompilationUnit].
    */
   CompilationUnit _parse(FileState file) {
     RecordingErrorListener errorListener = _getErrorListener(file);
 
     String content = file.content;
 
     CharSequenceReader reader = new CharSequenceReader(content);
     Scanner scanner = new Scanner(file.source, reader, errorListener);
     scanner.scanGenericMethodComments = _analysisOptions.strongMode;
@@ skipping 28 matching lines @@
 
     ErrorReporter libraryErrorReporter = _getErrorReporter(_library);
     LibraryIdentifier libraryNameNode = null;
     bool hasPartDirective = false;
     var seenPartSources = new Set<Source>();
     var directivesToResolve = <Directive>[];
     for (Directive directive in definingCompilationUnit.directives) {
       if (directive is LibraryDirective) {
         libraryNameNode = directive.name;
         directivesToResolve.add(directive);
+      } else if (directive is ImportDirective) {
+        for (ImportElement importElement in _libraryElement.imports) {
+          if (importElement.nameOffset == directive.offset) {
+            directive.element = importElement;
+            if (!_isLibrarySource(importElement.importedLibrary.source)) {
+              ErrorCode errorCode = importElement.isDeferred
+                  ? StaticWarningCode.IMPORT_OF_NON_LIBRARY
+                  : CompileTimeErrorCode.IMPORT_OF_NON_LIBRARY;
+              libraryErrorReporter.reportErrorForNode(
+                  errorCode, directive.uri, [directive.uri]);
+            }
+          }
+        }
+      } else if (directive is ExportDirective) {
+        for (ExportElement exportElement in _libraryElement.exports) {
+          if (exportElement.nameOffset == directive.offset) {
+            directive.element = exportElement;
+            if (!_isLibrarySource(exportElement.exportedLibrary.source)) {
+              libraryErrorReporter.reportErrorForNode(
+                  CompileTimeErrorCode.EXPORT_OF_NON_LIBRARY,
+                  directive.uri,
+                  [directive.uri]);
+            }
+          }
+        }
       } else if (directive is PartDirective) {
         hasPartDirective = true;
         StringLiteral partUri = directive.uri;
         Source partSource = directive.uriSource;
         CompilationUnit partUnit = sourceToUnit[partSource];
         if (partUnit != null) {
           directive.element = partUnit.element;
           //
           // Validate that the part source is unique in the library.
           //
@@ skipping 42 matching lines @@
           ResolverErrorCode.MISSING_LIBRARY_DIRECTIVE_WITH_PART, 0, 0);
     }
 
     //
     // Resolve the relevant directives to the library element.
     //
     for (Directive directive in directivesToResolve) {
       directive.element = _libraryElement;
     }
 
-    {
-      // TODO(scheglov) fill these maps?
-      DirectiveResolver resolver = new DirectiveResolver({}, {}, {});
-      definingCompilationUnit.accept(resolver);
-    }
+    // TODO(scheglov) remove DirectiveResolver class
   }
 
   void _resolveFile(FileState file, CompilationUnit unit) {
     RecordingErrorListener errorListener = _getErrorListener(file);
 
     CompilationUnitElement unitElement = unit.element;
     Source source = file.source;
 
     // TODO(scheglov) Hack: set types for top-level variables
     // Otherwise TypeResolverVisitor will set declared types, and because we
@@ skipping 264 matching lines @@
 }
 
 /**
  * Either the name or the source associated with a part-of directive.
  */
 class _NameOrSource {
   final String name;
   final Source source;
   _NameOrSource(this.name, this.source);
 }