blois@google.com
b9c11164ca
This is to allow Angular's transformers to continue to filter the assets considered entry points based on whether they contain a main() rather than just the asset ID. BUG= R=sigmund@google.com Review URL: https://codereview.chromium.org//235483002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@34985 260f80e4-7a28-3924-810f-c04153c831b5
56 lines
2.1 KiB
Dart
56 lines
2.1 KiB
Dart
// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'dart:async';
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import 'package:analyzer/analyzer.dart' as analyzer;
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import 'package:analyzer/src/generated/ast.dart';
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import 'package:barback/barback.dart';
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/// Checks to see if the provided AssetId is a Dart file in a directory which
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/// may contain entry points.
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///
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/// Directories are considered entry points if they are Dart files located in
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/// web/, test/, benchmark/ or example/.
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bool isPossibleDartEntryId(AssetId id) {
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if (id.extension != '.dart') return false;
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return ['benchmark', 'example', 'test', 'web']
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.any((dir) => id.path.startsWith("$dir/"));
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}
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/// Checks to see if the provided Asset is possibly a Dart entry point.
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///
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/// Assets are considered entry points if they pass [isPossibleDartEntryId] and
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/// have a main() method.
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///
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/// Because this only analyzes the primary asset this may return true for files
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/// which are not dart entries if the file does not have a main() but does have
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/// parts or exports.
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Future<bool> isPossibleDartEntry(Asset asset) {
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if (!isPossibleDartEntryId(asset.id)) return new Future.value(false);
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return asset.readAsString().then((contents) {
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return _couldBeEntrypoint(
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analyzer.parseCompilationUnit(contents, suppressErrors: true));
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});
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}
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bool _couldBeEntrypoint(CompilationUnit compilationUnit) {
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// Allow two or fewer arguments so that entrypoints intended for use with
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// [spawnUri] get counted.
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var hasMain = compilationUnit.declarations.any((node) =>
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node is FunctionDeclaration &&
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node.name.name == "main" &&
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node.functionExpression.parameters.parameters.length <= 2);
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if (hasMain) return true;
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// If it has an export or a part, assume the worst- that the main could be
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// in there.
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// We avoid loading those since this can be run from isPrimaryAsset calls
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// where we do not have access to other sources.
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return compilationUnit.directives.any((node) =>
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node is ExportDirective || node is PartDirective);
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}
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