Handle parts as input in resolver.

pkg/compiler/lib/src/dart2js_resolver.dart

Index: pkg/compiler/lib/src/dart2js_resolver.dart
diff --git a/pkg/compiler/bin/resolver.dart b/pkg/compiler/lib/src/dart2js_resolver.dart
similarity index 51%
copy from pkg/compiler/bin/resolver.dart
copy to pkg/compiler/lib/src/dart2js_resolver.dart
index d5b56da25d3c58093f18c0855fcf61658755ec48..2bf460eefd9c656c880d0a2b4014598b39000db7 100644
--- a/pkg/compiler/bin/resolver.dart
+++ b/pkg/compiler/lib/src/dart2js_resolver.dart
@@ -3,8 +3,8 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:io';
+import 'dart:async';
 
-import 'package:args/args.dart';
 import 'package:compiler/src/apiimpl.dart';
 import 'package:compiler/src/filenames.dart';
 import 'package:compiler/src/null_compiler_output.dart';
@@ -13,74 +13,60 @@ import 'package:compiler/src/serialization/json_serializer.dart';
 import 'package:compiler/src/source_file_provider.dart';
 import 'package:package_config/discovery.dart';
 
-main(var argv) async {
-  var parser = new ArgParser();
-  parser.addOption('deps', abbr: 'd', allowMultiple: true);
-  parser.addOption('out', abbr: 'o');
-  parser.addOption('library-root', abbr: 'l');
-  parser.addOption('packages', abbr: 'p');
-  parser.addOption('bazel-paths', abbr: 'I', allowMultiple: true);
-  var args = parser.parse(argv);
-
-  var resolutionInputs = args['deps']
+Future<String> resolve(List<Uri> inputs,
+    {List<String> deps: const <String>[],
+    List<String> bazelSearchPaths,
+    String root,
+    String packages,
+    Uri packageRoot,
+    String platformConfig}) async {
+  var resolutionInputs = deps
       .map((uri) => currentDirectory.resolve(nativeToUriPath(uri)))
       .toList();
-  var root = args['library-root'];
   var libraryRoot = root == null
       ? Platform.script.resolve('../../../sdk/')
       : currentDirectory.resolve(nativeToUriPath(root));
 
   var options = new CompilerOptions(
       libraryRoot: libraryRoot,
-      packageConfig: args['packages'] == null
-          ? null
-          : currentDirectory.resolve(args['packages']),
       resolveOnly: true,
+      analyzeMain: true,
       resolutionInputs: resolutionInputs,
-      packagesDiscoveryProvider: findPackages);
+      packageRoot: packageRoot,
+      packageConfig:
+          packages != null ? currentDirectory.resolve(packages) : null,
+      packagesDiscoveryProvider: findPackages,
+      platformConfigUri:
+          platformConfig != null ? libraryRoot.resolve(platformConfig) : null);
 
-  var bazelSearchPaths = args['bazel-paths'];
   var inputProvider = bazelSearchPaths != null
       ? new BazelInputProvider(bazelSearchPaths)
       : new CompilerSourceFileProvider();
 
   var outputProvider = const NullCompilerOutput();
   var diagnostics = new FormattingDiagnosticHandler(inputProvider)
-    ..enableColors = true;
+    ..enableColors = !Platform.isWindows;
   var compiler =
       new CompilerImpl(inputProvider, outputProvider, diagnostics, options);
 
-  if (args.rest.isEmpty) {
-    print('missing input files');
-    exit(1);
-  }
-
-  var inputs = args.rest
-      .map((uri) => currentDirectory.resolve(nativeToUriPath(uri)))
-      .toList();
-
   await compiler.setupSdk();
   await compiler.setupPackages(inputs.first);
 
-  for (var library in inputs) {
-    await compiler.libraryLoader.loadLibrary(library);
+  var librariesToSerialize = [];
+  for (var uri in inputs) {
+    var library = await compiler.analyzeUri(uri);
+    if (library != null) {
+      // [library] is `null` if [uri] is a part file.
+      librariesToSerialize.add(library);
+    }
   }
 
-  for (var library in inputs) {
-    compiler.fullyEnqueueLibrary(compiler.libraryLoader.lookupLibrary(library),
-        compiler.enqueuer.resolution);
+  if (librariesToSerialize.isEmpty) {
+    print('no library input files');
+    exit(1);
   }
 
-  compiler.processQueue(compiler.enqueuer.resolution, null);
-
-  var librariesToSerialize =
-      inputs.map((lib) => compiler.libraryLoader.lookupLibrary(lib)).toList();
-
   var serializer =
       compiler.serialization.createSerializer(librariesToSerialize);
-  var text = serializer.toText(const JsonSerializationEncoder());
-
-  var outFile = args['out'] ?? 'out.data';
-
-  await new File(outFile).writeAsString(text);
+  return serializer.toText(const JsonSerializationEncoder());
 }