Support Package Resolution Configuration files.

BUG=http://dartbug.com/23371
[email protected]

Committed: 36c29d0

Review URL: https://codereview.chromium.org//1162363004.

Author: harryterkelsen

DEPS

@@ -76,7 +76,7 @@ vars = {
   "oauth2_rev": "@1bff41f4d54505c36f2d1a001b83b8b745c452f5",
   "observe_rev": "@eee2b8ec34236fa46982575fbccff84f61202ac6",
   "observatory_pub_packages_rev": "@45565",
-  "package_config_tag": "@0.0.2+4",
+  "package_config_tag": "@0.0.3+1",
   "path_rev": "@93b3e2aa1db0ac0c8bab9d341588d77acda60320",
   "petitparser_rev" : "@37878",
   "ply_rev": "@604b32590ffad5cbb82e4afef1d305512d06ae93",

pkg/compiler/lib/compiler.dart

@@ -5,6 +5,7 @@
 library compiler;
 
 import 'dart:async';
+import 'package:package_config/packages.dart';
 import 'src/apiimpl.dart';
 
 // Unless explicitly allowed, passing [:null:] for any argument to the
@@ -58,13 +59,19 @@ typedef EventSink<String> CompilerOutputProvider(String name,
  * [:null:]. If [uri] is not [:null:], neither are [begin] and
  * [end]. [uri] indicates the compilation unit from where the
  * diagnostic originates. [begin] and [end] are zero-based character
- * offsets from the beginning of the compilaton unit. [message] is the
+ * offsets from the beginning of the compilation unit. [message] is the
  * diagnostic message, and [kind] indicates indicates what kind of
  * diagnostic it is.
  */
 typedef void DiagnosticHandler(Uri uri, int begin, int end,
                                String message, Diagnostic kind);
 
+/**
+ * Provides a package lookup mechanism in the case that no package root or
+ * package resolution configuration file are explicitly specified.
+ */
+typedef Future<Packages> PackagesDiscoveryProvider(Uri uri);
+
 /// Information resulting from the compilation.
 class CompilationResult {
   /// `true` if the compilation succeeded, that is, compilation didn't fail due
@@ -103,7 +110,9 @@ Future<CompilationResult> compile(
     DiagnosticHandler handler,
     [List<String> options = const [],
      CompilerOutputProvider outputProvider,
-     Map<String, dynamic> environment = const {}]) {
+     Map<String, dynamic> environment = const {},
+     Uri packageConfig,
+     PackagesDiscoveryProvider packagesDiscoveryProvider]) {
   if (!libraryRoot.path.endsWith("/")) {
     throw new ArgumentError("libraryRoot must end with a /");
   }
@@ -118,7 +127,9 @@ Future<CompilationResult> compile(
                                    libraryRoot,
                                    packageRoot,
                                    options,
-                                   environment);
+                                   environment,
+                                   packageConfig,
+                                   packagesDiscoveryProvider);
   return compiler.run(script).then((bool success) {
     return new CompilationResult(compiler, isSuccess: success);
   });

pkg/compiler/lib/src/apiimpl.dart

@@ -5,6 +5,7 @@
 library leg_apiimpl;
 
 import 'dart:async';
+import 'dart:convert';
 
 import '../compiler.dart' as api;
 import 'dart2jslib.dart' as leg;
@@ -13,6 +14,11 @@ import 'elements/elements.dart' as elements;
 import 'package:_internal/libraries.dart' hide LIBRARIES;
 import 'package:_internal/libraries.dart' as library_info show LIBRARIES;
 import 'io/source_file.dart';
+import 'package:package_config/packages.dart';
+import 'package:package_config/packages_file.dart' as pkgs;
+import 'package:package_config/src/packages_impl.dart'
+    show NonFilePackagesDirectoryPackages, MapPackages;
+import 'package:package_config/src/util.dart' show checkValidPackageUri;
 
 const bool forceIncrementalSupport =
     const bool.fromEnvironment('DART2JS_EXPERIMENTAL_INCREMENTAL_SUPPORT');
@@ -21,22 +27,28 @@ class Compiler extends leg.Compiler {
   api.CompilerInputProvider provider;
   api.DiagnosticHandler handler;
   final Uri libraryRoot;
+  final Uri packageConfig;
   final Uri packageRoot;
+  final api.PackagesDiscoveryProvider packagesDiscoveryProvider;
+  Packages packages;
   List<String> options;
   Map<String, dynamic> environment;
   bool mockableLibraryUsed = false;
   final Set<String> allowedLibraryCategories;
 
   leg.GenericTask userHandlerTask;
   leg.GenericTask userProviderTask;
+  leg.GenericTask userPackagesDiscoveryTask;
 
   Compiler(this.provider,
            api.CompilerOutputProvider outputProvider,
            this.handler,
            this.libraryRoot,
            this.packageRoot,
            List<String> options,
-           this.environment)
+           this.environment,
+           [this.packageConfig,
+            this.packagesDiscoveryProvider])
       : this.options = options,
         this.allowedLibraryCategories = getAllowedLibraryCategories(options),
         super(
@@ -96,17 +108,20 @@ class Compiler extends leg.Compiler {
     tasks.addAll([
         userHandlerTask = new leg.GenericTask('Diagnostic handler', this),
         userProviderTask = new leg.GenericTask('Input provider', this),
+        userPackagesDiscoveryTask =
+            new leg.GenericTask('Package discovery', this),
     ]);
     if (libraryRoot == null) {
       throw new ArgumentError("[libraryRoot] is null.");
     }
     if (!libraryRoot.path.endsWith("/")) {
       throw new ArgumentError("[libraryRoot] must end with a /.");
     }
-    if (packageRoot == null) {
-      throw new ArgumentError("[packageRoot] is null.");
+    if (packageRoot != null && packageConfig != null) {
+      throw new ArgumentError("Only one of [packageRoot] or [packageConfig] "
+                              "may be given.");
     }
-    if (!packageRoot.path.endsWith("/")) {
+    if (packageRoot != null && !packageRoot.path.endsWith("/")) {
       throw new ArgumentError("[packageRoot] must end with a /.");
     }
     if (!analyzeOnly) {
@@ -160,8 +175,7 @@ class Compiler extends leg.Compiler {
 
   // TODO(johnniwinther): Merge better with [translateDartUri] when
   // [scanBuiltinLibrary] is removed.
-  String lookupLibraryPath(String dartLibraryName) {
-    LibraryInfo info = lookupLibraryInfo(dartLibraryName);
+  String lookupLibraryPath(LibraryInfo info) {
     if (info == null) return null;
     if (!info.isDart2jsLibrary) return null;
     if (!allowedLibraryCategories.contains(info.category)) return null;
@@ -225,6 +239,7 @@ class Compiler extends leg.Compiler {
     }
 
     Uri resourceUri = translateUri(node, readableUri);
+    if (resourceUri == null) return synthesizeScript(node, readableUri);
     if (resourceUri.scheme == 'dart-ext') {
       if (!allowNativeExtensions) {
         withCurrentElement(element, () {
@@ -260,12 +275,11 @@ class Compiler extends leg.Compiler {
   }
 
   Future<leg.Script> synthesizeScript(leg.Spannable node, Uri readableUri) {
-    Uri resourceUri = translateUri(node, readableUri);
     return new Future.value(
         new leg.Script(
-            readableUri, resourceUri,
+            readableUri, readableUri,
             new StringSourceFile.fromUri(
-                resourceUri,
+                readableUri,
                 "// Synthetic source file generated for '$readableUri'."),
             isSynthesized: true));
   }
@@ -285,7 +299,7 @@ class Compiler extends leg.Compiler {
   Uri translateDartUri(elements.LibraryElement importingLibrary,
                        Uri resolvedUri, tree.Node node) {
     LibraryInfo libraryInfo = lookupLibraryInfo(resolvedUri.path);
-    String path = lookupLibraryPath(resolvedUri.path);
+    String path = lookupLibraryPath(libraryInfo);
     if (libraryInfo != null &&
         libraryInfo.category == "Internal") {
       bool allowInternalLibraryAccess = false;
@@ -333,25 +347,66 @@ class Compiler extends leg.Compiler {
   }
 
   Uri translatePackageUri(leg.Spannable node, Uri uri) {
-    return packageRoot.resolve(uri.path);
+    try {
+      checkValidPackageUri(uri);
+    } on ArgumentError catch (e) {
+      reportError(
+          node,
+          leg.MessageKind.INVALID_PACKAGE_URI,
+          {'uri': uri, 'exception': e.message});
+      return null;
+    }
+    return packages.resolve(uri,
+        notFound: (Uri notFound) {
+          reportError(
+              node,
+              leg.MessageKind.LIBRARY_NOT_FOUND,
+              {'resolvedUri': uri}
+          );
+          return null;
+        });
+  }
+
+  Future setupPackages(Uri uri) async {
+    if (packageRoot != null) {
+      // Use "non-file" packages because the file version requires a [Directory]
+      // and we can't depend on 'dart:io' classes.
+      packages = new NonFilePackagesDirectoryPackages(packageRoot);
+    } else if (packageConfig != null) {
+      var packageConfigContents = await provider(packageConfig);
+      if (packageConfigContents is String) {
+        packageConfigContents = UTF8.encode(packageConfigContents);
+      }
+      packages =
+          new MapPackages(pkgs.parse(packageConfigContents, packageConfig));
+    } else {
+      if (packagesDiscoveryProvider == null) {
+        packages = Packages.noPackages;
+      } else {
+        packages = await callUserPackagesDiscovery(uri);
+      }
+    }
   }
 
-  Future<bool> run(Uri uri) {
+  Future<bool> run(Uri uri) async {
     log('Allowed library categories: $allowedLibraryCategories');
-    return super.run(uri).then((bool success) {
-      int cumulated = 0;
-      for (final task in tasks) {
-        int elapsed = task.timing;
-        if (elapsed != 0) {
-          cumulated += elapsed;
-          log('${task.name} took ${elapsed}msec');
-        }
+
+    await setupPackages(uri);
+    assert(packages != null);
+
+    bool success = await super.run(uri);
+    int cumulated = 0;
+    for (final task in tasks) {
+      int elapsed = task.timing;
+      if (elapsed != 0) {
+        cumulated += elapsed;
+        log('${task.name} took ${elapsed}msec');
       }
-      int total = totalCompileTime.elapsedMilliseconds;
-      log('Total compile-time ${total}msec;'
-          ' unaccounted ${total - cumulated}msec');
-      return success;
-    });
+    }
+    int total = totalCompileTime.elapsedMilliseconds;
+    log('Total compile-time ${total}msec;'
+        ' unaccounted ${total - cumulated}msec');
+    return success;
   }
 
   void reportDiagnostic(leg.Spannable node,
@@ -368,8 +423,7 @@ class Compiler extends leg.Compiler {
     if (span == null || span.uri == null) {
       callUserHandler(null, null, null, '$message', kind);
     } else {
-      callUserHandler(
-          translateUri(null, span.uri), span.begin, span.end, '$message', kind);
+      callUserHandler(span.uri, span.begin, span.end, '$message', kind);
     }
   }
 
@@ -400,6 +454,16 @@ class Compiler extends leg.Compiler {
     }
   }
 
+  Future<Packages> callUserPackagesDiscovery(Uri uri) {
+    try {
+      return userPackagesDiscoveryTask.measure(
+                 () => packagesDiscoveryProvider(uri));
+    } catch (ex, s) {
+      diagnoseCrashInUserCode('Uncaught exception in package discovery', ex, s);
+      rethrow;
+    }
+  }
+
   void diagnoseCrashInUserCode(String message, exception, stackTrace) {
     hasCrashed = true;
     print('$message: ${tryToString(exception)}');

pkg/compiler/lib/src/dart2js.dart

@@ -19,6 +19,7 @@ import 'util/uri_extras.dart';
 import 'util/util.dart' show stackTraceFilePrefix;
 import 'util/command_line.dart';
 import 'package:_internal/libraries.dart';
+import 'package:package_config/discovery.dart' show findPackages;
 
 const String LIBRARY_ROOT = '../../../../../sdk';
 const String OUTPUT_LANGUAGE_DART = 'Dart';
@@ -105,6 +106,7 @@ Future<api.CompilationResult> compile(List<String> argv) {
   Uri libraryRoot = currentDirectory;
   Uri out = currentDirectory.resolve('out.js');
   Uri sourceMapOut = currentDirectory.resolve('out.js.map');
+  Uri packageConfig = null;
   Uri packageRoot = null;
   List<String> options = new List<String>();
   bool explicitOut = false;
@@ -140,6 +142,10 @@ Future<api.CompilationResult> compile(List<String> argv) {
     packageRoot = currentDirectory.resolve(extractPath(argument));
   }
 
+  setPackageConfig(String argument) {
+    packageConfig = currentDirectory.resolve(extractPath(argument));
+  }
+
   setOutput(Iterator<String> arguments) {
     optionsImplyCompilation.add(arguments.current);
     String path;
@@ -329,6 +335,7 @@ Future<api.CompilationResult> compile(List<String> argv) {
                       (_) => setTrustPrimitives(
                           '--trust-primitives')),
     new OptionHandler(r'--help|/\?|/h', (_) => wantHelp = true),
+    new OptionHandler('--packages=.+', setPackageConfig),
     new OptionHandler('--package-root=.+|-p.+', setPackageRoot),
     new OptionHandler('--analyze-all', setAnalyzeAll),
     new OptionHandler('--analyze-only', setAnalyzeOnly),
@@ -404,9 +411,8 @@ Future<api.CompilationResult> compile(List<String> argv) {
                 "checked mode.");
   }
 
-  Uri uri = currentDirectory.resolve(arguments[0]);
-  if (packageRoot == null) {
-    packageRoot = uri.resolve('./packages/');
+  if (packageRoot != null && packageConfig != null) {
+    helpAndFail("Cannot specify both '--package-root' and '--packages.");
   }
 
   if ((analyzeOnly || analyzeAll) && !optionsImplyCompilation.isEmpty) {
@@ -432,8 +438,6 @@ Future<api.CompilationResult> compile(List<String> argv) {
                 "combination with the '--output-type=dart' option.");
   }
 
-  diagnosticHandler.info('Package root is $packageRoot');
-
   options.add('--out=$out');
   options.add('--source-map=$sourceMapOut');
 
@@ -468,9 +472,10 @@ Future<api.CompilationResult> compile(List<String> argv) {
     return result;
   }
 
-  return compileFunc(uri, libraryRoot, packageRoot,
-                     inputProvider, diagnosticHandler,
-                     options, outputProvider, environment)
+  Uri uri = currentDirectory.resolve(arguments[0]);
+  return compileFunc(uri, libraryRoot, packageRoot, inputProvider,
+                     diagnosticHandler, options, outputProvider, environment,
+                     packageConfig, findPackages)
             .then(compilationDone);
 }
 
@@ -552,7 +557,12 @@ Supported options:
     Display version information.
 
   -p<path>, --package-root=<path>
-    Where to find packages, that is, "package:..." imports.
+    Where to find packages, that is, "package:..." imports.  This option cannot
+    be used with --packages.
+
+  --packages=<path>
+    Path to the package resolution configuration file, which supplies a mapping
+    of package names to paths.  This option cannot be used with --package-root.
 
   --analyze-all
     Analyze all code.  Without this option, the compiler only analyzes

pkg/compiler/lib/src/mirrors/analyze.dart

@@ -26,7 +26,9 @@ Future<MirrorSystem> analyze(List<Uri> libraries,
                              Uri packageRoot,
                              api.CompilerInputProvider inputProvider,
                              api.DiagnosticHandler diagnosticHandler,
-                             [List<String> options = const <String>[]]) {
+                             [List<String> options = const <String>[],
+                              Uri packageConfig,
+                              api.PackagesDiscoveryProvider findPackages]) {
   if (!libraryRoot.path.endsWith("/")) {
     throw new ArgumentError("libraryRoot must end with a /");
   }
@@ -54,9 +56,12 @@ Future<MirrorSystem> analyze(List<Uri> libraries,
   Compiler compiler = new apiimpl.Compiler(inputProvider,
                                            null,
                                            internalDiagnosticHandler,
-                                           libraryRoot, packageRoot,
+                                           libraryRoot,
+                                           packageRoot,
                                            options,
-                                           const {});
+                                           const {},
+                                           packageConfig,
+                                           findPackages);
   compiler.librariesToAnalyzeWhenRun = libraries;
   return compiler.run(null).then((bool success) {
     if (success && !compilationFailed) {