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Tim Blasi
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feat(dart/transform): Add a .ng_deps.dart file parser.
Create a common, reusable `.ng_deps.dart` file parser. All future transformer phases build on the information in `.ng_deps.dart` files.
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‎modules/angular2/src/transform/common/asset_reader.dart‎

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library angular2.src.transform.common.asset_reader;
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import 'dart:async';
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import 'dart:convert';
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import 'package:barback/barback.dart';
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abstract class AssetReader {
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Future<String> readAsString(AssetId id, {Encoding encoding});
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Future<bool> hasInput(AssetId id);
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/// Creates an [AssetReader] using the `transform`, which should be a
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/// [Transform] or [AggregateTransform].
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factory AssetReader.fromTransform(dynamic transform) =>
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new _TransformAssetReader(transform);
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}
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class _TransformAssetReader implements AssetReader {
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final dynamic t;
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_TransformAssetReader(this.t);
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Future<String> readAsString(AssetId id, {Encoding encoding}) =>
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t.readInputAsString(id, encoding: encoding);
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Future<bool> hasInput(AssetId id) => t.hasInput(id);
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}

‎modules/angular2/src/transform/common/parser.dart‎

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library angular2.src.transform.common.parser;
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import 'dart:async';
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import 'package:analyzer/analyzer.dart';
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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';
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import 'package:angular2/src/transform/common/names.dart';
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import 'package:barback/barback.dart';
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import 'package:code_transformers/assets.dart';
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import 'registered_type.dart';
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export 'registered_type.dart';
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class Parser {
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final AssetReader _reader;
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final _ParseNgDepsVisitor _visitor = new _ParseNgDepsVisitor();
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Parser(AssetReader this._reader);
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Future<List<NgDeps>> parseRecursive(AssetId id) async {
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return _recurse(id);
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}
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Future<NgDeps> parse(AssetId id) async {
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if (!(await _reader.hasInput(id))) return null;
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var ngDeps = new NgDeps(await _reader.readAsString(id));
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_visitor.ngDeps = ngDeps;
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parseCompilationUnit(ngDeps.code, name: id.path).accept(_visitor);
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return ngDeps;
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}
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/// Parses the `.ngDeps.dart` file represented by [id] into an [NgDeps]
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/// object. All `.ngDeps.dart` files imported by [id] are then parsed. The
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/// results are added to [allDeps].
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Future<List<NgDeps>> _recurse(AssetId id,
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[List<NgDeps> allDeps, Set<AssetId> seen]) async {
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if (seen == null) seen = new Set<AssetId>();
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if (seen.contains(id)) return;
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seen.add(id);
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if (allDeps == null) allDeps = [];
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var ngDeps = await parse(id);
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allDeps.add(ngDeps);
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var toWait = [];
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ngDeps.imports.forEach((ImportDirective node) {
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var uri = stringLiteralToString(node.uri);
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if (uri.endsWith(DEPS_EXTENSION)) {
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var importId = uriToAssetId(id, uri, logger, null);
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toWait.add(_recurse(importId, allDeps, seen));
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}
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});
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return Future.wait(toWait).then((_) => allDeps);
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}
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}
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class NgDeps {
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final String code;
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final List<ImportDirective> imports = [];
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final List<ExportDirective> exports = [];
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final List<RegisteredType> registeredTypes = [];
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FunctionDeclaration setupMethod;
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NgDeps(this.code);
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}
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class _ParseNgDepsVisitor extends Object with RecursiveAstVisitor<Object> {
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NgDeps ngDeps = null;
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_RegisteredTypeBuilder current = null;
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@override
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Object visitImportDirective(ImportDirective node) {
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ngDeps.imports.add(node);
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return super.visitImportDirective(node);
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}
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@override
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Object visitExportDirective(ExportDirective node) {
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ngDeps.exports.add(node);
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return super.visitExportDirective(node);
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}
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@override
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Object visitFunctionDeclaration(FunctionDeclaration node) {
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if ('${node.name}' == SETUP_METHOD_NAME) {
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ngDeps.setupMethod = node;
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}
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return super.visitFunctionDeclaration(node);
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}
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@override
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Object visitMethodInvocation(MethodInvocation node) {
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var isRegisterType = '${node.methodName}' == REGISTER_TYPE_METHOD_NAME;
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if (isRegisterType) {
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ngDeps.registeredTypes.add(new RegisteredType.fromMethodInvocation(node));
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}
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return super.visitMethodInvocation(node);
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}
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}

‎modules/angular2/src/transform/common/registered_type.dart‎

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library angular2.src.transform.common.registered_type;
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import 'package:analyzer/analyzer.dart';
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import 'package:angular2/src/transform/common/names.dart';
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/// Represents a call to `Reflector#registerType` generated by
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/// `DirectiveProcessor`.
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class RegisteredType {
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final Identifier typeName;
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final MethodInvocation registerMethod;
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final Expression factory;
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final Expression parameters;
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final Expression annotations;
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RegisteredType._(this.typeName, this.registerMethod, this.factory,
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this.parameters, this.annotations);
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/// Creates a [RegisteredType] given a [MethodInvocation] node representing
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/// a call to `registerType`.
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factory RegisteredType.fromMethodInvocation(MethodInvocation registerMethod) {
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var visitor = new _ParseRegisterTypeVisitor();
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registerMethod.accept(visitor);
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return new RegisteredType._(visitor.typeName, registerMethod,
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visitor.factory, visitor.parameters, visitor.annotations);
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}
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}
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class _ParseRegisterTypeVisitor extends Object
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with RecursiveAstVisitor<Object> {
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Identifier typeName;
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Expression factory;
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Expression parameters;
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Expression annotations;
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@override
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Object visitMethodInvocation(MethodInvocation node) {
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assert('${node.methodName}' == REGISTER_TYPE_METHOD_NAME);
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// The first argument to a `registerType` call is the type.
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typeName = node.argumentList.arguments[0] is Identifier
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? node.argumentList.arguments[0]
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: null;
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return super.visitMethodInvocation(node);
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}
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@override
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Object visitMapLiteralEntry(MapLiteralEntry node) {
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if (node.key is StringLiteral) {
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var key = stringLiteralToString(node.key);
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switch (key) {
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case 'annotations':
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annotations = node.value;
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break;
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case 'factory':
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factory = node.value;
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break;
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case 'parameters':
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parameters = node.value;
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break;
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}
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}
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// Do not need to descend any further.
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return null;
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}
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}

‎modules/angular2/test/transform/common/read_file.dart‎

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library angular2.test.transform.common.read_file;
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import 'dart:async';
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import 'dart:io';
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import 'package:angular2/src/transform/common/asset_reader.dart';
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import 'package:barback/barback.dart';
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/// Smooths over differences in CWD between IDEs and running tests in Travis.
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String readFile(String path) {
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for (var myPath in [path, 'test/transform/${path}']) {
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}
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return null;
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}
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class TestAssetReader implements AssetReader {
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Future<String> readAsString(AssetId id, {Encoding encoding}) =>
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new Future.value(readFile(id.path));
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Future<bool> hasInput(AssetId id) {
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var exists = false;
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for (var myPath in [id.path, 'test/transform/${id.path}']) {
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var file = new File(myPath);
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exists = exists || file.existsSync();
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}
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return new Future.value(exists);
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}
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}

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