refactor(js2dart): use the parent functionalities as mush as possible

Closes #18

tools/js2dart/src/compiler.js

@@ -9,26 +9,30 @@ import {
 } from 'traceur/src/Options';
 
 export class Compiler extends TraceurCompiler {
+
   constructor(options, sourceRoot) {
     super(options, sourceRoot);
   }
-  compile(source, filename) {
-    var parsed = this.parse(source, filename || '<unknown_file>');
-    if (this.options_.outputLanguage === 'dart') {
-      return this.writeDart(this.transformDart(parsed), filename);
+
+  transform(tree, moduleName = undefined) {
+    if (this.options_.outputLanguage.toLowerCase() === 'dart') {
+      var transformer = new ClassTransformer();
+      return transformer.transformAny(tree);
     } else {
-      return this.write(this.transform(parsed));
+      return super(tree, moduleName);
     }
   }
-  transformDart(tree) {
-    var transformer = new ClassTransformer();
-    return transformer.transformAny(tree);
-  }
-  writeDart(tree, filename) {
-    var writer = new DartTreeWriter(this.resolveModuleName(filename));
-    writer.visitAny(tree);
-    return writer.toString();
+
+  write(tree, outputName = undefined, sourceRoot = undefined) {
+   if (this.options_.outputLanguage.toLowerCase() === 'dart') {
+      var writer = new DartTreeWriter(outputName);
+      writer.visitAny(tree);
+      return writer.toString();
+    } else {
+      return super.write(tree, outputName, sourceRoot);
+    }
   }
+
   // Copy of the original method to use our custom Parser
   parse(content, sourceName) {
     if (!content) {

tools/js2dart/src/parser.js

@@ -9,14 +9,10 @@ export class Parser extends TraceurParser {
   constructor(file, errorReporter = new SyntaxErrorReporter()) {
     super(file, errorReporter);
   }
+
   parseTypeName_() {
     // Copy of original implementation
-    var start = this.getTreeStartLocation_();
-    var typeName = new TypeName(this.getTreeLocation_(start), null, this.eatId_());
-    while (this.eatIf_(PERIOD)) {
-      var memberName = this.eatIdName_();
-      typeName = new TypeName(this.getTreeLocation_(start), typeName, memberName);
-    }
+    var typeName = super.parseTypeName_();
     var next = this.peekType_();
     // Generics support
     if (this.eatIf_(OPEN_ANGLE)) {
@@ -29,6 +25,7 @@ export class Parser extends TraceurParser {
     }
     return typeName;
   }
+
   parseImportSpecifier_() {
     // Copy of original implementation
     var start = this.getTreeStartLocation_();
@@ -38,7 +35,7 @@ export class Parser extends TraceurParser {
     var name = this.eatIdName_();
     // Support for wraps keywoard
     if (this.peekToken_().value === WRAPS) {
-      var token = this.nextToken_();
+      token = this.nextToken_();
       var wrappedIdentifier = this.eatId_();
       // TODO: Save the fact that this is a wrapper type and
       // also the wrapped type
@@ -53,9 +50,10 @@ export class Parser extends TraceurParser {
     }
     return new ImportSpecifier(this.getTreeLocation_(start), binding, name);
   }
+
   parseObjectType_() {
    //TODO(misko): save the type information
-   this.eat_(OPEN_CURLY)
+   this.eat_(OPEN_CURLY);
    do {
      var identifier = this.eatId_();
      this.eat_(COLON);