work in progress: observable implementation using detailed change records

lib/src/emitters.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.
 
 /** Collects several code emitters for the template tool. */
 library emitters;
 
 import 'package:html5lib/dom.dart';
 import 'package:html5lib/dom_parsing.dart';
 
@@ skipping 333 matching lines @@
 
     var code = codeInfo.code;
     var match = new RegExp('class ${info.constructor}[^{]*{').firstMatch(code);
     if (match != null) {
       var printer = new CodePrinter();
       var libraryName = (codeInfo.libraryName != null)
           ? codeInfo.libraryName
           : info.tagName.replaceAll(new RegExp('[-./]'), '_');
       printer.add(codegen.header(info.declaringFile.path, libraryName));
 
-      // Add exisitng import, export, and part directives.
+      // Add existing import, export, and part directives.
       for (var directive in codeInfo.directives) {
         printer.add(codegen.directiveText(directive, info, pathInfo));
       }
 
       // Add imports only for those components used by this component.
       var imports = info.usedComponents.keys.mappedBy(
           (c) => pathInfo.relativePath(info, c));
 
       if (hasExtends) {
         // Inject an import to the base component.
@@ skipping 49 matching lines @@
 
     // Inject library name if not pressent.
     var codeInfo = _fileInfo.userCode;
     if (codeInfo == null) {
       codeInfo = new DartCodeInfo(null, null, [], 'main(){\n}');
     }
     var libraryName = codeInfo.libraryName != null
         ? codeInfo.libraryName : _fileInfo.libraryName;
     printer.add(codegen.header(_fileInfo.path, libraryName));
 
-    // Add exisitng import, export, and part directives.
+    // Add existing import, export, and part directives.
     for (var directive in codeInfo.directives) {
       printer.add(codegen.directiveText(directive, _fileInfo, pathInfo));
     }
 
     // Import only those components used by the page.
     var imports = _fileInfo.usedComponents.keys.mappedBy(
           (c) => pathInfo.relativePath(_fileInfo, c));
     var mainCode = codegen.mainDartCode(
         codeInfo.code, _context.declarations.formatString(1),
         _context.printer.formatString(1));
     printer.add(codegen.importList(imports)).addRaw(mainCode);
     return printer.formatString();
   }
 }
 
+/** Emits a .dart file using the [DartCodeInfo]. */
+String emitDartFile(FileInfo fileInfo, PathInfo pathInfo) {
+  var printer = new CodePrinter();
+
+  // Inject library name if not pressent.
+  var codeInfo = fileInfo.userCode;
+  var libraryName = codeInfo.libraryName;
+  printer.add(codegen.header(fileInfo.path, codeInfo.libraryName));
+
+  // Add existing import, export, and part directives.
+  for (var directive in codeInfo.directives) {
+    printer.add(codegen.directiveText(directive, fileInfo, pathInfo));
+  }
+  printer.addRaw(codeInfo.code);
+  return printer.formatString();
+}
+
 /** Clears all fields in [declarations]. */
 String _clearFields(Declarations declarations) {
   if (declarations.declarations.isEmpty) return '';
   var buff = new StringBuffer();
   for (var d in declarations.declarations) {
     buff.add('${d.name} = ');
   }
   buff.add('null;');
   return buff.toString();
 }
@@ skipping 53 matching lines @@
     }
     typeName = htmlElementExtends[typeName];
   }
   // If we didn't find a DOM setter, and this is a component, set a property on
   // the component.
   if (info.component != null && !name.startsWith('data-')) {
     return 'xtag.${toCamelCase(name)}';
   }
   return "attributes['$name']";
 }