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fix(dart/transform): Handle export cycles

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Currently, an export cycle in dart inputs will cause the transformer to
hang indefinitely on the `DirectiveMetadataExtractor` step.

Closes #4370
This commit is contained in:
Tim Blasi
2015-09-25 13:33:25 -07:00
parent af9f916a9c
commit e7d65ad96f
5 changed files with 81 additions and 5 deletions
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17
modules_dart/transform/lib/src/transform/directive_metadata_extractor/extractor.dart
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@ -22,13 +22,16 @@ import 'package:code_transformers/assets.dart';
/// [NgMeta] if there are no `Directive`-annotated classes in `entryPoint`.
Future<NgMeta> extractDirectiveMetadata(
AssetReader reader, AssetId entryPoint) {
return _extractDirectiveMetadataRecursive(reader, entryPoint);
return _extractDirectiveMetadataRecursive(
reader, entryPoint, new Set<AssetId>());
}
var _nullFuture = new Future.value(null);
final _nullFuture = new Future.value(null);
Future<NgMeta> _extractDirectiveMetadataRecursive(
AssetReader reader, AssetId entryPoint) async {
AssetReader reader, AssetId entryPoint, Set<AssetId> seen) async {
if (seen.contains(entryPoint)) return _nullFuture;
seen.add(entryPoint);
var ngMeta = new NgMeta.empty();
if (!(await reader.hasInput(entryPoint))) return ngMeta;
@ -51,8 +54,12 @@ Future<NgMeta> _extractDirectiveMetadataRecursive(
var assetId = uriToAssetId(entryPoint, uri, logger, null /* span */,
errorOnAbsolute: false);
if (assetId == entryPoint) return _nullFuture;
return _extractDirectiveMetadataRecursive(reader, assetId)
.then(ngMeta.addAll);
return _extractDirectiveMetadataRecursive(reader, assetId, seen)
.then((exportedNgMeta) {
if (exportedNgMeta != null) {
ngMeta.addAll(exportedNgMeta);
}
});
}));
return ngMeta;
}