Initial API for the Dart front_end package.

pkg/front_end/lib/compiler_options.dart

Index: pkg/front_end/lib/compiler_options.dart
diff --git a/pkg/front_end/lib/compiler_options.dart b/pkg/front_end/lib/compiler_options.dart
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+// Copyright (c) 2016, 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.
+
+library front_end.compiler_options;
+
+import 'compilation_error.dart';
+
+/// Callback used to report errors encountered during compilation.
+typedef void ErrorHandler(CompilationError error);
+
+/// Front-end options relevant to compiler back ends.
+///
+/// TODO(paulberry): add a mechanism to allow file system operations to be
+/// stubbed out for testing.
+class CompilerOptions {
+  /// The path to the Dart SDK.
+  ///
+  /// If `null`, the SDK will be searched for using
+  /// [Platform.resolvedExecutable] as a starting point.
+  ///
+  /// This option is mutually exclusive with [sdkSummary].
+  String sdkPath;
+
+  /// Callback to which compilation errors should be delivered.
+  ///
+  /// If `null`, the first error will be reported by throwing an exception of
+  /// type [CompilationError].
+  ErrorHandler onError;
+
+  /// Path to the ".packages" file.
+  ///
+  /// If `null`, the ".packages" file will be found via the standard
+  /// package_config search algorithm.
+  String packagesFilePath;
+
+  /// Paths to the input summary files (excluding the SDK summary).  These files
+  /// should all be linked summaries.  They should also be closed, in the sense
+  /// that any libraries they reference should also appear in [inputSummaries]
+  /// or [sdkSummary].
+  List<String> inputSummaries = [];
+
+  /// Path to the SDK summary file.
+  ///
+  /// This should be a linked summary.  If `null`, the SDK summary will be
+  /// searched for at a default location within [sdkPath].
+  ///
+  /// This option is mutually exclusive with [sdkPath].  TODO(paulberry): if the
+  /// VM does not contain a pickled copy of the SDK, we might need to change
+  /// this.
+  String sdkSummary;
+
+  /// URI override map.
+  ///
+  /// This is a map from Uri to file path.  Any URI override listed in this map
+  /// takes precedence over the URI resolution that would be implied by the
+  /// packages file (see [packagesFilePath]) and/or [bazelRoots].
+  ///
+  /// If a URI is not listed in this map, then the normal URI resolution
+  /// algorithm will be used.
+  ///
+  /// TODO(paulberry): transition analyzer and dev_compiler to use the
+  /// "file:///bazel-root" mechanism, and then remove this.
+  @deprecated
+  Map<Uri, String> uriOverride = {};
+
+  /// Bazel roots.
+  ///
+  /// Any Uri that resolves to "file:///bazel-root/$rest" will be searched for
+  /// at "$root/$rest" ("$root\\$rest" in Windows), where "$root" is drawn from
+  /// this list.  If the file is not found at any of those locations, the URI
+  /// "file:///bazel-root/$rest" will be used directly.
+  ///
+  /// Intended use: if the Bazel workspace is located at path "$workspace", this
+  /// could be set to `['$workspace', '$workspace/bazel-bin',
+  /// '$workspace/bazel-genfiles']`, effectively overlaying source and generated
+  /// files.
+  List<String> bazelRoots = [];
+
+  /// Sets the platform bit, which determines which patch files should be
+  /// applied to the SDK.
+  ///
+  /// The value should be a power of two, and should match the `PLATFORM` bit
+  /// flags in sdk/lib/_internal/sdk_library_metadata/lib/libraries.dart.  If
+  /// zero, no patch files will be applied.
+  int platformBit;
+
+  /// The declared variables for use by configurable imports and constant
+  /// evaluation.
+  Map<String, String> declaredVariables;
+}