Ted Sander
5cc84ed4bb
Implement deferred libraries to work with dependency injection and other angular codegen. This is done by not initializing the library in the parent ng_deps file when it is declared as deferred, rewriting the import and, chaining a future that initializes the library in any files that are using deferred libraries which need angular codegen.
50 lines
1.6 KiB
Dart
50 lines
1.6 KiB
Dart
library angular2.transform.deferred_rewriter.transformer;
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import 'dart:async';
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import 'package:angular2/src/transform/common/asset_reader.dart';
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import 'package:angular2/src/transform/common/logging.dart' as log;
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import 'package:angular2/src/transform/common/names.dart';
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import 'package:angular2/src/transform/common/options.dart';
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import 'package:barback/barback.dart';
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import 'rewriter.dart';
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/// Transformer responsible for rewriting deferred library loads to enable
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/// initializing the reflector in a deferred way to keep the code with the
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/// deferred library.
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class DeferredRewriter extends Transformer {
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final TransformerOptions options;
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DeferredRewriter(this.options);
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@override
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bool isPrimary(AssetId id) =>
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id.extension.endsWith('dart') && !id.path.endsWith(DEPS_EXTENSION);
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@override
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Future apply(Transform transform) async {
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log.init(transform);
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try {
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var asset = transform.primaryInput;
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var reader = new AssetReader.fromTransform(transform);
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var transformedCode = await rewriteDeferredLibraries(reader, asset.id);
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if (transformedCode != null) {
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transform.addOutput(
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new Asset.fromString(transform.primaryInput.id, transformedCode));
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}
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} catch (ex, stackTrace) {
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log.logger.warning('Rewritting deferred libraries failed.\n'
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'Exception: $ex\n'
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'Stack Trace: $stackTrace');
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}
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}
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}
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// Visible for testing
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Future<String> rewriteDeferredLibraries(AssetReader reader, AssetId id) async {
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var rewriter = new Rewriter(id, reader);
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return await rewriter.rewrite();
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}
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