Library Dependencies Analysis service API.

pkg/analysis_server/lib/src/services/dependencies/library_dependencies.dart

+// Copyright (c) 2015, 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 'dart:math' as math;
+
+import 'package:analyzer/src/generated/element.dart';
+import 'package:analyzer/src/generated/engine.dart';
+import 'package:analyzer/src/generated/source.dart';
+
+String _getParentPath(String path) {

[scheglov, 2015/01/21 15:10:06]

Use "dirname" from "package:path" instead.

[pquitslund, 2015/01/22 19:22:15]

Good idea.  I'm changing the API to return libraries after all so this can just
go away though.

+  if (path.length == 0) {
+    return '';
+  }
+  int end = math.max(path.lastIndexOf('/'), path.lastIndexOf('\\'));
+  if (end == path.length - 1) {
+    end =
+        math.max(path.lastIndexOf('/', end - 1), path.lastIndexOf('\\', end - 1));
+  }
+  return end == -1 ? '' : path.substring(0, end);
+}
+
+class LibraryDependencyCollector {
+
+  final Set<LibraryElement> myVisitedLibraries = new Set<LibraryElement>();
+  final Set<String> _dependencies = new Set<String>();
+
+  final List<AnalysisContext> _contexts;
+
+  LibraryDependencyCollector(this._contexts);
+
+  Set<String> collectFolderDependencies() {
+    _contexts.forEach(
+        (AnalysisContext context) =>
+            context.librarySources.forEach(
+                (Source source) => _addDependencies(context.getLibraryElement(source))));
+    return _dependencies;
+  }
+
+  void _addDependencies(LibraryElement libraryElement) {
+    if (libraryElement == null) {
+      return;
+    }
+    if (myVisitedLibraries.add(libraryElement)) {
+      for (CompilationUnitElement cu in libraryElement.units) {
+        final String path = cu.source.fullName;
+        if (path != null) {
+          _dependencies.add(_getParentPath(path));
+        }
+      }
+      libraryElement.imports.forEach(
+          (ImportElement import) => _addDependencies(import.importedLibrary));
+      libraryElement.exports.forEach(
+          (ExportElement export) => _addDependencies(export.exportedLibrary));
+    }
+  }
+}