Update all Angular libs (run update_all.sh).

third_party/pkg/angular/lib/tools/transformer/expression_generator.dart

+library angular.tools.transformer.expression_generator;
+
+import 'dart:async';
+import 'package:analyzer/src/generated/element.dart';
+import 'package:angular/core/parser/parser.dart';
+import 'package:angular/tools/html_extractor.dart';
+import 'package:angular/tools/parser_getter_setter/generator.dart';
+import 'package:angular/tools/source_crawler.dart';
+import 'package:angular/tools/source_metadata_extractor.dart';
+import 'package:angular/tools/transformer/options.dart';
+import 'package:angular/tools/transformer/referenced_uris.dart';
+import 'package:barback/barback.dart';
+import 'package:code_transformers/resolver.dart';
+import 'package:di/di.dart';
+import 'package:di/dynamic_injector.dart';
+import 'package:path/path.dart' as path;
+
+/**
+ * Transformer which gathers all expressions from the HTML source files and
+ * Dart source files of an application and packages them for static evaluation.
+ *
+ * This will also modify the main Dart source file to import the generated
+ * expressions and modify all references to NG_EXPRESSION_MODULE to refer to
+ * the generated expressions.
+ */
+class ExpressionGenerator extends Transformer with ResolverTransformer {
+  final TransformOptions options;
+
+  ExpressionGenerator(this.options, Resolvers resolvers) {
+    this.resolvers = resolvers;
+  }
+
+  Future applyResolver(Transform transform, Resolver resolver) {
+    var asset = transform.primaryInput;
+    var outputBuffer = new StringBuffer();
+
+    _writeStaticExpressionHeader(asset.id, outputBuffer);
+
+    var sourceMetadataExtractor = new SourceMetadataExtractor();
+    var directives =
+        sourceMetadataExtractor.gatherDirectiveInfo(null,
+        new _LibrarySourceCrawler(resolver.libraries));
+
+    var htmlExtractor = new HtmlExpressionExtractor(directives);
+    return _getHtmlSources(transform, resolver)
+        .forEach(htmlExtractor.parseHtml)
+        .then((_) {
+      var module = new Module()
+        ..type(Parser, implementedBy: DynamicParser)
+        ..type(ParserBackend, implementedBy: DartGetterSetterGen);
+      var injector =
+          new DynamicInjector(modules: [module], allowImplicitInjection: true);
+
+      injector.get(_ParserGetterSetter).generateParser(
+          htmlExtractor.expressions.toList(), outputBuffer);
+
+      var id = transform.primaryInput.id;
+      var outputFilename = '${path.url.basenameWithoutExtension(id.path)}'
+          '_static_expressions.dart';
+      var outputPath = path.url.join(path.url.dirname(id.path), outputFilename);
+      var outputId = new AssetId(id.package, outputPath);
+      transform.addOutput(
+            new Asset.fromString(outputId, outputBuffer.toString()));
+
+      transform.addOutput(asset);
+    });
+  }
+
+  /**
+   * Gets a stream consisting of the contents of all HTML source files to be
+   * scoured for expressions.
+   */
+  Stream<String> _getHtmlSources(Transform transform, Resolver resolver) {
+    var id = transform.primaryInput.id;
+
+    var controller = new StreamController<String>();
+    var assets = options.htmlFiles
+        .map((path) => _uriToAssetId(path, transform))
+        .where((id) => id != null)
+        .toList();
+
+    // Get all of the contents of templates in @Component(templateUrl:'...')
+    gatherReferencedUris(transform, resolver, options,
+        templatesOnly: true).then((templates) {
+      templates.values.forEach(controller.add);
+    }).then((_) {
+      // Add any HTML files referencing this Dart file.
+      return _findHtmlEntry(transform);
+    }).then((htmlRefId) {
+      if (htmlRefId != null) {
+        assets.add(htmlRefId);
+      }
+      Future.wait(
+        // Add any manually specified HTML files.
+        assets.map((id) => transform.readInputAsString(id))
+            .map((future) =>
+                future.then(controller.add).catchError((e) {
+                  transform.logger.warning('Unable to find $id from html_files '
+                      'in pubspec.yaml.');
+                }))
+        ).then((_) {
+          controller.close();
+        });
+    });
+
+    return controller.stream;
+  }
+
+  AssetId _uriToAssetId(String uri, Transform transform) {
+    if (path.url.isAbsolute(uri)) {
+      var parts = path.url.split(uri);
+      if (parts[1] == 'packages') {
+        var pkgPath = path.url.join('lib', path.url.joinAll(parts.skip(3)));
+        return new AssetId(parts[2], pkgPath);
+      }
+      transform.logger.warning('Cannot cache non-package absolute URIs. $uri');
+      return null;
+    }
+    return new AssetId(transform.primaryInput.id.package, uri);
+  }
+
+  /// Finds any HTML files referencing the primary input of the transform.
+  Future<AssetId> _findHtmlEntry(Transform transform) {
+    var id = transform.primaryInput.id;
+    // Magic file generated by HtmlDartReferencesGenerator
+    var htmlRefId = new AssetId(id.package, id.path + '.html_reference');
+
+    return transform.readInputAsString(htmlRefId).then((path) {
+      return new AssetId(id.package, path);
+    }, onError: (e, s) => null); // swallow not-found errors.
+  }
+}
+
+void _writeStaticExpressionHeader(AssetId id, StringSink sink) {
+  var libPath = path.withoutExtension(id.path).replaceAll('/', '.');
+  sink.write('''
+library ${id.package}.$libPath.generated_expressions;
+
+import 'package:angular/change_detection/change_detection.dart';
+
+''');
+}
+
+class _LibrarySourceCrawler implements SourceCrawler {
+  final Iterable<LibraryElement> libraries;
+  _LibrarySourceCrawler(this.libraries);
+
+  void crawl(String entryPoint, CompilationUnitVisitor visitor) {
+    libraries.expand((lib) => lib.units)
+        .map((compilationUnitElement) => compilationUnitElement.node)
+        .forEach(visitor);
+  }
+}
+
+class _ParserGetterSetter {
+  final Parser parser;
+  final ParserBackend backend;
+  _ParserGetterSetter(this.parser, this.backend);
+
+  generateParser(List<String> exprs, StringSink sink) {
+    exprs.forEach((expr) {
+      try {
+        parser(expr);
+      } catch (e) {
+        // Ignore exceptions.
+      }
+    });
+
+    DartGetterSetterGen backend = this.backend;
+    sink.write(generateClosures(backend.properties, backend.calls, backend.symbols));
+  }
+
+  String generateClosures(Set<String> properties,
+                          Set<String> calls,
+                          Set<String> symbols) {
+    var getters = new Set.from(properties)..addAll(calls);
+    return '''
+final Map<String, FieldGetter> getters = ${generateGetterMap(getters)};
+final Map<String, FieldSetter> setters = ${generateSetterMap(properties)};
+final Map<String, Symbol> symbols = ${generateSymbolMap(symbols)};
+''';
+  }
+
+  generateGetterMap(Iterable<String> keys) {
+    var lines = keys.map((key) => '  r"${key}": (o) => o.$key');
+    return '{\n${lines.join(",\n")}\n}';
+  }
+
+  generateSetterMap(Iterable<String> keys) {
+    var lines = keys.map((key) => '  r"${key}": (o, v) => o.$key = v');
+    return '{\n${lines.join(",\n")}\n}';
+  }
+
+  generateSymbolMap(Set<String> symbols) {
+    var lines = symbols.map((key) => '  r"${key}": #$key');
+    return '{\n${lines.join(",\n")}\n}';
+  }
+}
+