Support compiling templates in the browser.

bin/dwc_browser.dart

+// Copyright (c) 2012, 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.
+
+/**
+ * Compiles Dart Web Components from within a Chrome extension.
+ * The Chrome extension logic exists outside of Dart as Dart does not support
+ * Chrome extension APIs at this time.
+ */
+library dwc_browser;
+
+import 'dart:html';
+import 'package:args/args.dart';
+import 'package:web_components/src/template/cmd_options.dart';
+import 'package:web_components/src/template/file_system.dart';
+import 'package:web_components/src/template/file_system_browser.dart';
+import 'package:web_components/src/template/dartio_stub.dart';
+import 'package:web_components/src/template/world.dart';
+import 'package:web_components/src/template/compile.dart';
+import 'package:web_components/src/template/utils.dart';
+import 'package:web_components/dwc_shared.dart';
+import 'package:js/js.dart' as js;
+
+FileSystem fileSystem;
+
+
+void main() {
+  js.scoped(() {
+    js.context.setOnParseCallback(new js.Callback.many(parse));
+  });
+}
+
+/**
+ * Parse all templates in [sourceFullFn].
+ * [sourcePagePort] is a Chrome extension port used to communicate back to the
+ * source page that will consume these proxied urls.
+ * See extension/background.js.
+ */
+void parse(js.Proxy sourcePagePort, String sourceFullFn) {
+  // TODO(jacobr): we need to send error messages back to sourcePagePort.
+  js.retain(sourcePagePort);
+  print("Processing: $sourceFullFn");
+  // TODO(jacobr): provide a way to pass in options.
+  var argParser = commandOptions();
+  ArgResults results = argParser.parse([]);
+
+  fileSystem = new BrowserFileSystem(sourcePagePort);
+
+  initHtmlWorld(parseOptions(results, fileSystem));
+
+  Path srcPath = new Path(sourceFullFn);
+  Path outputFullDir = srcPath.directoryPath;
+
+  Path srcDir = srcPath.directoryPath;
+
+  String sourceFilename = srcPath.filename;
+
+  asyncTime('Compiled $sourceFullFn', () {
+    var compiler = new Compile(fileSystem);
+    return compiler.run(srcPath.filename, srcDir.toString()).chain((_) {
+      // Write out the code associated with each source file.
+      print("Writing files:");
+      for (var file in compiler.output) {
+        writeFile(file.filename, outputFullDir, file.contents);
+      }
+      var ret = fileSystem.flush();
+      js.release(sourcePagePort);
+      return ret;
+    });
+  }, printTime: true);
+}
+
+void writeFile(String filename, Path outdir, String contents) {
+  print("XXX ${outdir}/$filename");
+  fileSystem.writeString("${outdir}/$filename", contents);
+}