fixes #219, able to compile multiple entry points

lib/src/compiler.dart

Index: lib/src/compiler.dart
diff --git a/lib/src/compiler.dart b/lib/src/compiler.dart
new file mode 100644
index 0000000000000000000000000000000000000000..dee14a141a57bb0878d907e6c0bb32eda064119f
--- /dev/null
+++ b/lib/src/compiler.dart
@@ -0,0 +1,390 @@
+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// Command line tool to run the checker on a Dart program.
+library dev_compiler.src.compiler;
+
+import 'dart:async';
+import 'dart:collection';
+import 'dart:math' as math;
+import 'dart:io';
+
+import 'package:analyzer/src/generated/element.dart';
+import 'package:analyzer/src/generated/engine.dart'
+    show AnalysisEngine, AnalysisContext, ChangeSet, ParseDartTask;
+import 'package:analyzer/src/generated/error.dart'
+    show AnalysisError, ErrorSeverity, ErrorType;
+import 'package:analyzer/src/generated/error.dart';
+import 'package:analyzer/src/generated/resolver.dart' show TypeProvider;
+import 'package:analyzer/src/generated/source.dart' show Source;
+import 'package:analyzer/src/task/html.dart';
+import 'package:html/dom.dart' as html;
+import 'package:html/parser.dart' as html;
+import 'package:logging/logging.dart' show Level, Logger, LogRecord;
+import 'package:path/path.dart' as path;
+
+import 'package:dev_compiler/strong_mode.dart' show StrongModeOptions;
+
+import 'analysis_context.dart';
+import 'checker/checker.dart';
+import 'checker/rules.dart';
+import 'codegen/html_codegen.dart' as html_codegen;
+import 'codegen/js_codegen.dart';
+import 'info.dart'
+    show AnalyzerMessage, CheckerResults, LibraryInfo, LibraryUnit;
+import 'options.dart';
+import 'report.dart';
+
+/// Sets up the type checker logger to print a span that highlights error
+/// messages.
+StreamSubscription setupLogger(Level level, printFn) {
+  Logger.root.level = level;
+  return Logger.root.onRecord.listen((LogRecord rec) {
+    printFn('${rec.level.name.toLowerCase()}: ${rec.message}');
+  });
+}
+
+class BatchCompiler extends AbstractCompiler {
+  JSGenerator _jsGen;
+
+  /// Already compiled sources, so we don't compile them again.
+  final _compiled = new HashSet<LibraryElement>();
+
+  bool _failure = false;
+  bool get failure => _failure;
+
+  BatchCompiler(AnalysisContext context, CompilerOptions options,
+      {AnalysisErrorListener reporter})
+      : super(context, options, reporter) {
+    if (outputDir != null) {
+      _jsGen = new JSGenerator(this);
+    }
+  }
+
+  void reset() {
+    _compiled.clear();
+  }
+
+  /// Compiles every file in [options.inputs].
+  /// Returns true on successful compile.
+  bool run() {
+    var clock = new Stopwatch()..start();
+    options.inputs.forEach(compileFromUriString);
+    clock.stop();
+    var time = (clock.elapsedMilliseconds / 1000).toStringAsFixed(2);
+    _log.fine('Compiled ${_compiled.length} libraries in ${time} s\n');
+
+    return !_failure;
+  }
+
+  void compileFromUriString(String uriString) {
+    compileFromUri(stringToUri(uriString));
+  }
+
+  void compileFromUri(Uri uri) {
+    var source = context.sourceFactory.forUri(Uri.encodeFull('$uri'));
+    if (source == null) throw new ArgumentError.value(
+        uri.toString(), 'uri', 'could not find source for');
+    compileSource(source);
+  }
+
+  void compileSource(Source source) {
+    if (AnalysisEngine.isHtmlFileName(source.uri.path)) {
+      compileHtml(source);
+      return;
+    }
+
+    compileLibrary(context.computeLibraryElement(source));
+  }
+
+  void compileLibrary(LibraryElement library) {
+    if (!_compiled.add(library)) return;
+    if (!options.checkSdk && library.source.uri.scheme == 'dart') return;
+
+    // TODO(jmesserly): in incremental mode, we can skip the transitive
+    // compile of imports/exports.
+    library.importedLibraries.forEach(compileLibrary);
+    library.exportedLibraries.forEach(compileLibrary);
+
+    var unitElements = [library.definingCompilationUnit]..addAll(library.parts);
+    var units = [];
+
+    bool failureInLib = false;
+    for (var element in unitElements) {
+      var unit = context.resolveCompilationUnit(element.source, library);
+      units.add(unit);
+      failureInLib = logErrors(element.source) || failureInLib;
+      checker.visitCompilationUnit(unit);
+      if (checker.failure) failureInLib = true;
+    }
+
+    if (failureInLib) {
+      _failure = true;
+      if (!options.codegenOptions.forceCompile) return;
+    }
+
+    if (_jsGen != null) {
+      _jsGen.generateLibrary(
+          new LibraryUnit(units.first, units.skip(1).toList()));
+    }
+  }
+
+  void compileHtml(Source source) {
+    // TODO(jmesserly): reuse DartScriptsTask instead of copy/paste.
+    var contents = context.getContents(source);
+    var document = html.parse(contents.data, generateSpans: true);
+    var scripts = document.querySelectorAll('script[type="application/dart"]');
+
+    var loadedLibs = new LinkedHashSet<Uri>();
+
+    for (var script in scripts) {
+      Source scriptSource = null;
+      var srcAttr = script.attributes['src'];
+      if (srcAttr == null) {
+        if (script.hasContent()) {
+          var fragments = <ScriptFragment>[];
+          for (var node in script.nodes) {
+            if (node is html.Text) {
+              var start = node.sourceSpan.start;
+              fragments.add(new ScriptFragment(
+                  start.offset, start.line, start.column, node.data));
+            }
+          }
+          scriptSource = new DartScript(source, fragments);
+        }
+      } else if (AnalysisEngine.isDartFileName(srcAttr)) {
+        scriptSource = context.sourceFactory.resolveUri(source, srcAttr);
+      }
+
+      if (scriptSource != null) {
+        var lib = context.computeLibraryElement(scriptSource);
+        compileLibrary(lib);
+        script.replaceWith(_linkLibraries(lib, loadedLibs));
+      }
+    }
+
+    // TODO(jmesserly): we need to clean this up so we aren't treating these
+    // as a special case.
+    for (var file in defaultRuntimeFiles) {
+      var input = path.join(options.runtimeDir, file);
+      var output = path.join(outputDir, runtimeFileOutput(file));
+      new Directory(path.dirname(output)).createSync(recursive: true);
+      new File(input).copySync(output);
+    }
+
+    new File(getOutputPath(source.uri)).openSync(mode: FileMode.WRITE)
+      ..writeStringSync(document.outerHtml)
+      ..writeStringSync('\n')
+      ..closeSync();
+  }
+
+  html.DocumentFragment _linkLibraries(
+      LibraryElement mainLib, LinkedHashSet<Uri> loaded) {
+    var alreadyLoaded = loaded.length;
+    _collectLibraries(mainLib, loaded);
+
+    var newLibs = loaded.skip(alreadyLoaded);
+    var df = new html.DocumentFragment();
+    for (var path in defaultRuntimeFiles) {
+      df.append(html_codegen.libraryInclude(runtimeFileOutput(path)));
+    }
+    for (var uri in newLibs) {
+      if (uri.scheme == 'dart') continue;
+      df.append(html_codegen.libraryInclude(getModulePath(uri)));
+    }
+    df.append(html_codegen.invokeMain(getModuleName(mainLib.source.uri)));
+    return df;
+  }
+
+  void _collectLibraries(LibraryElement lib, LinkedHashSet<Uri> loaded) {
+    var uri = lib.source.uri;
+    if (!loaded.add(uri)) return;
+    for (var l in lib.importedLibraries) _collectLibraries(l, loaded);
+    for (var l in lib.exportedLibraries) _collectLibraries(l, loaded);
+    // Move the item to the end of the list.
+    loaded.remove(uri);
+    loaded.add(uri);
+  }
+
+  String runtimeFileOutput(String file) =>
+      path.join('dev_compiler', 'runtime', file);
+}
+
+abstract class AbstractCompiler {
+  final CompilerOptions options;
+  final AnalysisContext context;
+  final CodeChecker checker;
+
+  AbstractCompiler(AnalysisContext context, CompilerOptions options,
+      [AnalysisErrorListener reporter])
+      : context = context,
+        options = options,
+        checker = createChecker(context.typeProvider, options.strongOptions,
+            reporter == null ? AnalysisErrorListener.NULL_LISTENER : reporter) {
+    enableDevCompilerInference(context, options.strongOptions);
+  }
+
+  static CodeChecker createChecker(TypeProvider typeProvider,
+      StrongModeOptions options, AnalysisErrorListener reporter) {
+    return new CodeChecker(
+        new RestrictedRules(typeProvider, options: options), reporter, options);
+  }
+
+  String get outputDir => options.codegenOptions.outputDir;
+  TypeRules get rules => checker.rules;
+  AnalysisErrorListener get reporter => checker.reporter;
+
+  Uri stringToUri(String uriString) {
+    var uri = uriString.startsWith('dart:') || uriString.startsWith('package:')
+        ? Uri.parse(uriString)
+        : new Uri.file(uriString);
+    return uri;
+  }
+
+  /// Directory presumed to be the common prefix for all input file:// URIs.
+  /// Used when computing output paths.
+  ///
+  /// For example:
+  ///   dartdevc -o out foo/a.dart bar/b.dart
+  ///
+  /// Will produce:
+  ///   out/foo/a.dart
+  ///   out/bar/b.dart
+  ///
+  /// This is only used if at least one of [options.codegenOptions.inputs] is
+  /// a file URI.
+  // TODO(jmesserly): do we need an option for this?
+  // Other ideas: we could look up and see what package the file is in, treat
+  // that as a base path. We could also use the current working directory as
+  // the base.
+  String get inputBaseDir {
+    if (_fileUriCommonBaseDir == null) {
+      List<String> common = null;
+      for (var uri in options.inputs.map(stringToUri)) {
+        if (uri.scheme != 'file') continue;
+
+        var segments = path.split(path.dirname(uri.path));
+        if (common == null) {
+          common = segments;
+        } else {
+          int len = math.min(common.length, segments.length);
+          while (len > 0 && common[len - 1] != segments[len - 1]) {
+            len--;
+          }
+          common.length = len;
+        }
+      }
+      _fileUriCommonBaseDir = common == null ? '' : path.joinAll(common);
+    }
+    return _fileUriCommonBaseDir;
+  }
+  String _fileUriCommonBaseDir;
+
+  String getOutputPath(Uri uri) => path.join(outputDir, getModulePath(uri));
+
+  /// Like [getModuleName] but includes the file extension, either .js or .html.
+  String getModulePath(Uri uri) {
+    var ext = path.extension(uri.path);
+    if (ext == '.dart' || ext == '' && uri.scheme == 'dart') ext = '.js';
+    return getModuleName(uri) + ext;
+  }
+
+  /// Gets the module name, without extension. For example:
+  ///
+  /// * dart:core -> dart/core
+  /// * file:foo/bar/baz.dart -> foo/bar/baz
+  /// * package:qux/qux.dart -> qux/qux
+  ///
+  /// For file: URLs this will also make them relative to [inputBaseDir].
+  String getModuleName(Uri uri) {
+    var filepath = path.withoutExtension(uri.path);
+    if (uri.scheme == 'dart') {
+      filepath = 'dart/$filepath';
+    } else if (uri.scheme == 'file') {
+      filepath = path.relative(filepath, from: inputBaseDir);
+    } else {
+      assert(uri.scheme == 'package');
+      // filepath is good here, we want the output to start with a directory
+      // matching the package name.
+    }
+    return filepath;
+  }
+
+  /// Log any errors encountered when resolving [source] and return whether any
+  /// errors were found.
+  bool logErrors(Source source) {
+    List<AnalysisError> errors = context.computeErrors(source);
+    bool failure = false;
+    if (errors.isNotEmpty) {
+      for (var error in errors) {
+        // Always skip TODOs.
+        if (error.errorCode.type == ErrorType.TODO) continue;
+
+        // Skip hints for now. In the future these could be turned on via flags.
+        if (error.errorCode.errorSeverity.ordinal <
+            ErrorSeverity.WARNING.ordinal) {
+          continue;
+        }
+
+        // All analyzer warnings or errors are errors for DDC.
+        failure = true;
+        reporter.onError(error);
+      }
+    }
+    return failure;
+  }
+}
+
+AnalysisErrorListener createErrorReporter(
+    AnalysisContext context, CompilerOptions options) {
+  return options.dumpInfo
+      ? new SummaryReporter(context, options.logLevel)
+      : new LogReporter(context, useColors: options.useColors);
+}
+
+// TODO(jmesserly): find a better home for these.
+/// Curated order to minimize lazy classes needed by dart:core and its
+/// transitive SDK imports.
+const corelibOrder = const [
+  'dart.core',
+  'dart.collection',
+  'dart._internal',
+  'dart.math',
+  'dart._interceptors',
+  'dart.async',
+  'dart._foreign_helper',
+  'dart._js_embedded_names',
+  'dart._js_helper',
+  'dart.isolate',
+  'dart.typed_data',
+  'dart._native_typed_data',
+  'dart._isolate_helper',
+  'dart._js_primitives',
+  'dart.convert',
+  'dart.mirrors',
+  'dart._js_mirrors',
+  'dart.js'
+  // _foreign_helper is not included, as it only defines the JS builtin that
+  // the compiler handles at compile time.
+];
+
+/// Runtime files added to all applications when running the compiler in the
+/// command line.
+final defaultRuntimeFiles = () {
+  var files = [
+    'harmony_feature_check.js',
+    'dart_utils.js',
+    'dart_library.js',
+    '_errors.js',
+    '_types.js',
+    '_rtti.js',
+    '_classes.js',
+    '_operations.js',
+    'dart_runtime.js',
+  ];
+  files.addAll(corelibOrder.map((l) => l.replaceAll('.', '/') + '.js'));
+  return files;
+}();
+
+final _log = new Logger('dev_compiler.src.compiler');