dart2js: Use an abstract Name class for names in the generated JavaScript ast.

pkg/compiler/lib/src/js_emitter/class_stub_generator.dart

 // Copyright (c) 2014, 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.
 
 part of dart2js.js_emitter;
 
 class ClassStubGenerator {
   final Namer namer;
   final Compiler compiler;
   final JavaScriptBackend backend;
 
   ClassStubGenerator(this.compiler, this.namer, this.backend);
 
   jsAst.Expression generateClassConstructor(ClassElement classElement,
                                             Iterable<String> fields) {
     // TODO(sra): Implement placeholders in VariableDeclaration position:
     //
     //     String constructorName = namer.getNameOfClass(classElement);
     //     return js.statement('function #(#) { #; }',
     //        [ constructorName, fields,
     //            fields.map(
     //                (name) => js('this.# = #', [name, name]))]));
     return js('function(#) { #; this.#();}',
         [fields,
          fields.map((name) => js('this.# = #', [name, name])),
          namer.deferredAction]);
   }
 
-  jsAst.Expression generateGetter(Element member, String fieldName) {
+  jsAst.Expression generateGetter(Element member, jsAst.Name fieldName) {
     ClassElement cls = member.enclosingClass;
     String receiver = backend.isInterceptorClass(cls) ? 'receiver' : 'this';
     List<String> args = backend.isInterceptedMethod(member) ? ['receiver'] : [];
     return js('function(#) { return #.# }', [args, receiver, fieldName]);
   }
 
-  jsAst.Expression generateSetter(Element member, String fieldName) {
+  jsAst.Expression generateSetter(Element member, jsAst.Name fieldName) {
     ClassElement cls = member.enclosingClass;
     String receiver = backend.isInterceptorClass(cls) ? 'receiver' : 'this';
     List<String> args = backend.isInterceptedMethod(member) ? ['receiver'] : [];
     // TODO(floitsch): remove 'return'?
     return js('function(#, v) { return #.# = v; }',
         [args, receiver, fieldName]);
   }
 
   /**
    * Documentation wanted -- johnniwinther
    *
    * Invariant: [member] must be a declaration element.
    */
-  Map<String, jsAst.Expression> generateCallStubsForGetter(
+  Map<jsAst.Name, jsAst.Expression> generateCallStubsForGetter(
       Element member, Map<Selector, TypeMaskSet> selectors) {
     assert(invariant(member, member.isDeclaration));
 
     // If the method is intercepted, the stub gets the
     // receiver explicitely and we need to pass it to the getter call.
     bool isInterceptedMethod = backend.isInterceptedMethod(member);
     bool isInterceptorClass =
         backend.isInterceptorClass(member.enclosingClass);
 
     const String receiverArgumentName = r'$receiver';
 
     jsAst.Expression buildGetter() {
       jsAst.Expression receiver =
           js(isInterceptorClass ? receiverArgumentName : 'this');
       if (member.isGetter) {
-        String getterName = namer.getterForElement(member);
+        jsAst.Name getterName = namer.getterForElement(member);
         if (isInterceptedMethod) {
           return js('this.#(#)', [getterName, receiver]);
         }
         return js('#.#()', [receiver, getterName]);
       } else {
-        String fieldName = namer.instanceFieldPropertyName(member);
+        jsAst.Name fieldName = namer.instanceFieldPropertyName(member);
         return js('#.#', [receiver, fieldName]);
       }
     }
 
-    Map<String, jsAst.Expression> generatedStubs = <String, jsAst.Expression>{};
+    Map<jsAst.Name, jsAst.Expression> generatedStubs =
+      <jsAst.Name, jsAst.Expression>{};
 
     // Two selectors may match but differ only in type.  To avoid generating
     // identical stubs for each we track untyped selectors which already have
     // stubs.
     Set<Selector> generatedSelectors = new Set<Selector>();
     for (Selector selector in selectors.keys) {
       if (generatedSelectors.contains(selector)) continue;
       if (!selector.appliesUnnamed(member, compiler.world)) continue;
       for (TypeMask mask in selectors[selector].masks) {
         if (mask != null &&
             !mask.canHit(member, selector, compiler.world)) {
           continue;
         }
 
         generatedSelectors.add(selector);
 
-        String invocationName = namer.invocationName(selector);
+        jsAst.Name invocationName = namer.invocationName(selector);
         Selector callSelector = new Selector.callClosureFrom(selector);
-        String closureCallName = namer.invocationName(callSelector);
+        jsAst.Name closureCallName = namer.invocationName(callSelector);
 
         List<jsAst.Parameter> parameters = <jsAst.Parameter>[];
         List<jsAst.Expression> arguments = <jsAst.Expression>[];
         if (isInterceptedMethod) {
           parameters.add(new jsAst.Parameter(receiverArgumentName));
         }
 
         for (int i = 0; i < selector.argumentCount; i++) {
           String name = 'arg$i';
           parameters.add(new jsAst.Parameter(name));
           arguments.add(js('#', name));
         }
 
         jsAst.Fun function = js(
             'function(#) { return #.#(#); }',
             [ parameters, buildGetter(), closureCallName, arguments]);
 
         generatedStubs[invocationName] = function;
       }
     }
 
     return generatedStubs;
   }
 
-  Map<String, Selector> computeSelectorsForNsmHandlers() {
+  Map<jsAst.Name, Selector> computeSelectorsForNsmHandlers() {
 
-    Map<String, Selector> jsNames = <String, Selector>{};
+    Map<jsAst.Name, Selector> jsNames = <jsAst.Name, Selector>{};
 
     // Do not generate no such method handlers if there is no class.
     if (compiler.codegenWorld.directlyInstantiatedClasses.isEmpty) {
       return jsNames;
     }
 
     void addNoSuchMethodHandlers(String ignore,
                                  Map<Selector, TypeMaskSet> selectors) {
       TypeMask objectSubclassTypeMask =
           new TypeMask.subclass(compiler.objectClass, compiler.world);
 
       for (Selector selector in selectors.keys) {
         TypeMaskSet maskSet = selectors[selector];
         for (TypeMask mask in maskSet.masks) {
           if (mask == null) mask = objectSubclassTypeMask;
 
           if (mask.needsNoSuchMethodHandling(selector, compiler.world)) {
-            String jsName = namer.invocationMirrorInternalName(selector);
+            jsAst.Name jsName = namer.invocationMirrorInternalName(selector);
             jsNames[jsName] = selector;
             break;
           }
         }
       }
     }
 
     compiler.codegenWorld.forEachInvokedName(addNoSuchMethodHandlers);
     compiler.codegenWorld.forEachInvokedGetter(addNoSuchMethodHandlers);
     compiler.codegenWorld.forEachInvokedSetter(addNoSuchMethodHandlers);
     return jsNames;
   }
 
-  StubMethod generateStubForNoSuchMethod(String name, Selector selector) {
+  StubMethod generateStubForNoSuchMethod(jsAst.Name name,
+                                         Selector selector) {
     // Values match JSInvocationMirror in js-helper library.
     int type = selector.invocationMirrorKind;
     List<String> parameterNames =
         new List.generate(selector.argumentCount, (i) => '\$$i');
 
     List<jsAst.Expression> argNames =
         selector.callStructure.getOrderedNamedArguments().map((String name) =>
             js.string(name)).toList();
 
-    String methodName = selector.invocationMirrorMemberName;
-    String internalName = namer.invocationMirrorInternalName(selector);
+    jsAst.Name methodName = namer.asName(selector.invocationMirrorMemberName);
+    jsAst.Name internalName = namer.invocationMirrorInternalName(selector);
 
     assert(backend.isInterceptedName(Compiler.NO_SUCH_METHOD));
     jsAst.Expression expression =
         js('''this.#noSuchMethodName(this,
                     #createInvocationMirror(#methodName,
                                             #internalName,
                                             #type,
                                             #arguments,
                                             #namedArguments))''',
            {'noSuchMethodName': namer.noSuchMethodName,
             'createInvocationMirror':
                 backend.emitter.staticFunctionAccess(
                     backend.getCreateInvocationMirror()),
             'methodName':
-                js.string(compiler.enableMinification
+                js.quoteName(compiler.enableMinification
                     ? internalName : methodName),
-            'internalName': js.string(internalName),
+            'internalName': js.quoteName(internalName),
             'type': js.number(type),
             'arguments':
                 new jsAst.ArrayInitializer(parameterNames.map(js).toList()),
             'namedArguments': new jsAst.ArrayInitializer(argNames)});
 
     jsAst.Expression function;
     if (backend.isInterceptedName(selector.name)) {
       function = js(r'function($receiver, #) { return # }',
                               [parameterNames, expression]);
     } else {
@@ skipping 93 matching lines @@
           ? function() {
               if (cache === void 0) cache = #tearOff(
                   this, funcs, reflectionInfo, true, [], name).prototype;
               return cache;
             }
           : tearOffGetter(funcs, reflectionInfo, name, isIntercepted);
     }''',  {'tearOff': tearOffAccessExpression});
 
   return <jsAst.Statement>[tearOffGetter, tearOff];
 }