Reapply "Tweak public APIs and use them in patch_sdk, dart2js, and kernel-service.""

pkg/front_end/lib/src/fasta/vm.dart

Index: pkg/front_end/lib/src/fasta/vm.dart
diff --git a/pkg/front_end/lib/src/fasta/vm.dart b/pkg/front_end/lib/src/fasta/vm.dart
deleted file mode 100644
index 2da5da863b50ea880b9c269148ae24691840a280..0000000000000000000000000000000000000000
--- a/pkg/front_end/lib/src/fasta/vm.dart
+++ /dev/null
@@ -1,165 +0,0 @@
-// 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.
-
-/// API for compiling Dart source code to .dill (Kernel IR) files.
-library front_end.vm;
-// TODO(ahe): Convert this file to use the API in `../../kernel_generator.dart`
-// and `../../compiler_options.dart`.
-
-import 'dart:async' show Future;
-
-import 'dart:io' show File, Platform;
-
-import 'dart:typed_data' show Uint8List;
-
-import 'package:front_end/file_system.dart';
-import 'package:front_end/physical_file_system.dart';
-
-import 'fasta.dart' as fasta;
-
-import 'package:kernel/target/targets.dart' show TargetFlags;
-import 'package:kernel/target/vm_fasta.dart' show VmFastaTarget;
-
-/// Compilation status codes.
-///
-/// Note: The [index] property of these constants must match
-/// `Dart_KernelCompilationStatus` in
-/// [dart_api.h](../../../../runtime/include/dart_api.h).
-enum Status {
-  /// Compilation was successful.
-  ok,
-
-  /// Compilation failed with a compile time error.
-  error,
-
-  /// Compiler crashed.
-  crash,
-}
-
-abstract class CompilationResult {
-  CompilationResult._();
-
-  factory CompilationResult.ok(Uint8List bytes) = _CompilationOk;
-
-  factory CompilationResult.errors(List<String> errors) = _CompilationError;
-
-  factory CompilationResult.error(String error) {
-    return new _CompilationError(<String>[error]);
-  }
-
-  factory CompilationResult.crash(Object exception, StackTrace stack) =
-      _CompilationCrash;
-
-  Status get status;
-
-  get payload;
-
-  List toResponse() => [status.index, payload];
-}
-
-Future<CompilationResult> parseScript(Uri script,
-    {bool verbose: false, bool strongMode: false}) async {
-  return parseScriptInFileSystem(script, PhysicalFileSystem.instance,
-      verbose: verbose, strongMode: strongMode);
-}
-
-Future<CompilationResult> parseScriptInFileSystem(
-    Uri script, FileSystem fileSystem,
-    {bool verbose: false, bool strongMode: false}) async {
-  final Uri packagesUri = (Platform.packageConfig != null)
-      ? Uri.parse(Platform.packageConfig)
-      : await _findPackagesFile(fileSystem, script);
-  if (packagesUri == null) {
-    throw "Could not find .packages";
-  }
-
-  final Uri patchedSdk = Uri.base
-      .resolveUri(new Uri.file(Platform.resolvedExecutable))
-      .resolveUri(new Uri.directory("patched_sdk"));
-
-  if (verbose) {
-    print("""DFE: Requesting compilation {
-  scriptUri: ${script}
-  packagesUri: ${packagesUri}
-  patchedSdk: ${patchedSdk}
-}""");
-  }
-
-  try {
-    return await fasta.parseScriptInFileSystem(script, fileSystem, packagesUri,
-        patchedSdk, new VmFastaTarget(new TargetFlags(strongMode: strongMode)),
-        verbose: verbose);
-  } catch (err, stack) {
-    return new CompilationResult.crash(err, stack);
-  }
-}
-
-class _CompilationOk extends CompilationResult {
-  final Uint8List bytes;
-
-  _CompilationOk(this.bytes) : super._();
-
-  @override
-  Status get status => Status.ok;
-
-  @override
-  get payload => bytes;
-
-  String toString() => "_CompilationOk(${bytes.length} bytes)";
-}
-
-abstract class _CompilationFail extends CompilationResult {
-  _CompilationFail() : super._();
-
-  String get errorString;
-
-  @override
-  get payload => errorString;
-}
-
-class _CompilationError extends _CompilationFail {
-  final List<String> errors;
-
-  _CompilationError(this.errors);
-
-  @override
-  Status get status => Status.error;
-
-  @override
-  String get errorString => errors.take(10).join('\n');
-
-  String toString() => "_CompilationError(${errorString})";
-}
-
-class _CompilationCrash extends _CompilationFail {
-  final Object exception;
-  final StackTrace stack;
-
-  _CompilationCrash(this.exception, this.stack);
-
-  @override
-  Status get status => Status.crash;
-
-  @override
-  String get errorString => "${exception}\n${stack}";
-
-  String toString() => "_CompilationCrash(${errorString})";
-}
-
-/// This duplicates functionality from the Loader which we can't easily
-/// access from here.
-Future<Uri> _findPackagesFile(FileSystem fileSystem, Uri base) async {
-  var dir = new File.fromUri(base).parent;
-  while (true) {
-    final packagesFile = dir.uri.resolve(".packages");
-    if (await fileSystem.entityForUri(packagesFile).exists()) {
-      return packagesFile;
-    }
-    if (dir.parent.path == dir.path) {
-      break;
-    }
-    dir = dir.parent;
-  }
-  return null;
-}