dartfmt pkg/compiler

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<jsAst.Name> fields) {
+  jsAst.Expression generateClassConstructor(
+      ClassElement classElement, Iterable<jsAst.Name> 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]);
+    return js('function(#) { #; this.#();}', [
+      fields,
+      fields.map((name) => js('this.# = #', [name, name])),
+      namer.deferredAction
+    ]);
   }
 
   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, 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]);
+    return js(
+        'function(#, v) { return #.# = v; }', [args, receiver, fieldName]);
   }
 
   /**
    * Documentation wanted -- johnniwinther
    *
    * Invariant: [member] must be a declaration element.
    */
   Map<jsAst.Name, jsAst.Expression> generateCallStubsForGetter(
       Element member, Map<Selector, SelectorConstraints> 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);
+    bool isInterceptorClass = backend.isInterceptorClass(member.enclosingClass);
 
     const String receiverArgumentName = r'$receiver';
 
     jsAst.Expression buildGetter() {
       jsAst.Expression receiver =
           js(isInterceptorClass ? receiverArgumentName : 'this');
       if (member.isGetter) {
         jsAst.Name getterName = namer.getterForElement(member);
         if (isInterceptedMethod) {
           return js('this.#(#)', [getterName, receiver]);
         }
         return js('#.#()', [receiver, getterName]);
       } else {
         jsAst.Name fieldName = namer.instanceFieldPropertyName(member);
         return js('#.#', [receiver, fieldName]);
       }
     }
 
     Map<jsAst.Name, jsAst.Expression> generatedStubs =
-      <jsAst.Name, jsAst.Expression>{};
+        <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;
       if (selectors[selector].applies(member, selector, compiler.world)) {
         generatedSelectors.add(selector);
 
         jsAst.Name invocationName = namer.invocationName(selector);
         Selector callSelector = new Selector.callClosureFrom(selector);
         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]);
+        jsAst.Fun function = js('function(#) { return #.#(#); }',
+            [parameters, buildGetter(), closureCallName, arguments]);
 
         generatedStubs[invocationName] = function;
       }
     }
 
     return generatedStubs;
   }
 
   Map<jsAst.Name, Selector> computeSelectorsForNsmHandlers() {
-
     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, SelectorConstraints> selectors) {
+    void addNoSuchMethodHandlers(
+        String ignore, Map<Selector, SelectorConstraints> selectors) {
       for (Selector selector in selectors.keys) {
         SelectorConstraints maskSet = selectors[selector];
         if (maskSet.needsNoSuchMethodHandling(selector, compiler.world)) {
           jsAst.Name jsName = namer.invocationMirrorInternalName(selector);
           jsNames[jsName] = selector;
         }
       }
     }
 
     compiler.codegenWorld.forEachInvokedName(addNoSuchMethodHandlers);
     compiler.codegenWorld.forEachInvokedGetter(addNoSuchMethodHandlers);
     compiler.codegenWorld.forEachInvokedSetter(addNoSuchMethodHandlers);
     return jsNames;
   }
 
-  StubMethod generateStubForNoSuchMethod(jsAst.Name 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();
+    List<jsAst.Expression> argNames = selector.callStructure
+        .getOrderedNamedArguments()
+        .map((String name) => js.string(name))
+        .toList();
 
     jsAst.Name methodName = namer.asName(selector.invocationMirrorMemberName);
     jsAst.Name internalName = namer.invocationMirrorInternalName(selector);
 
     assert(backend.isInterceptedName(Identifiers.noSuchMethod_));
     bool isIntercepted = backend.isInterceptedName(selector.name);
-    jsAst.Expression expression =
-        js('''this.#noSuchMethodName(#receiver,
+    jsAst.Expression expression = js(
+        '''this.#noSuchMethodName(#receiver,
                     #createInvocationMirror(#methodName,
                                             #internalName,
                                             #type,
                                             #arguments,
                                             #namedArguments))''',
-           {'receiver': isIntercepted ? r'$receiver' : 'this',
-            'noSuchMethodName': namer.noSuchMethodName,
-            'createInvocationMirror':
-                backend.emitter.staticFunctionAccess(
-                    backend.helpers.createInvocationMirror),
-            'methodName':
-                js.quoteName(compiler.options.enableMinification
-                    ? internalName : methodName),
-            'internalName': js.quoteName(internalName),
-            'type': js.number(type),
-            'arguments':
-                new jsAst.ArrayInitializer(parameterNames.map(js).toList()),
-            'namedArguments': new jsAst.ArrayInitializer(argNames)});
+        {
+          'receiver': isIntercepted ? r'$receiver' : 'this',
+          'noSuchMethodName': namer.noSuchMethodName,
+          'createInvocationMirror': backend.emitter
+              .staticFunctionAccess(backend.helpers.createInvocationMirror),
+          'methodName': js.quoteName(
+              compiler.options.enableMinification ? internalName : methodName),
+          '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 (isIntercepted) {
-      function = js(r'function($receiver, #) { return # }',
-                              [parameterNames, expression]);
+      function = js(
+          r'function($receiver, #) { return # }', [parameterNames, expression]);
     } else {
       function = js(r'function(#) { return # }', [parameterNames, expression]);
     }
     return new StubMethod(name, function);
   }
 }
 
 /// Creates two JavaScript functions: `tearOffGetter` and `tearOff`.
 ///
 /// `tearOffGetter` is internal and only used by `tearOff`.
@@ skipping 18 matching lines @@
   jsAst.Expression tearOffGlobalObject;
   if (closureFromTearOff != null) {
     tearOffAccessExpression =
         backend.emitter.staticFunctionAccess(closureFromTearOff);
     tearOffGlobalObject =
         js.stringPart(namer.globalObjectFor(closureFromTearOff));
     tearOffGlobalObjectString =
         js.string(namer.globalObjectFor(closureFromTearOff));
   } else {
     // Default values for mocked-up test libraries.
-    tearOffAccessExpression = js(
-        r'''function() { throw "Helper 'closureFromTearOff' missing." }''');
+    tearOffAccessExpression =
+        js(r'''function() { throw "Helper 'closureFromTearOff' missing." }''');
     tearOffGlobalObjectString = js.string('MissingHelperFunction');
     tearOffGlobalObject = js(
         r'''(function() { throw "Helper 'closureFromTearOff' missing." })()''');
   }
 
   jsAst.Statement tearOffGetter;
   if (!compiler.options.useContentSecurityPolicy) {
     jsAst.Expression tearOffAccessText =
         new jsAst.UnparsedNode(tearOffAccessExpression, compiler, false);
-    tearOffGetter = js.statement('''
+    tearOffGetter = js.statement(
+        '''
 function tearOffGetter(funcs, reflectionInfo, name, isIntercepted) {
   return isIntercepted
       ? new Function("funcs", "reflectionInfo", "name",
                      #tearOffGlobalObjectString, "c",
           "return function tearOff_" + name + (functionCounter++) + "(x) {" +
             "if (c === null) c = " + #tearOffAccessText + "(" +
                 "this, funcs, reflectionInfo, false, [x], name);" +
                 "return new c(this, funcs[0], x, name);" +
                 "}")(funcs, reflectionInfo, name, #tearOffGlobalObject, null)
       : new Function("funcs", "reflectionInfo", "name",
                      #tearOffGlobalObjectString, "c",
           "return function tearOff_" + name + (functionCounter++)+ "() {" +
             "if (c === null) c = " + #tearOffAccessText + "(" +
                 "this, funcs, reflectionInfo, false, [], name);" +
                 "return new c(this, funcs[0], null, name);" +
                 "}")(funcs, reflectionInfo, name, #tearOffGlobalObject, null);
-}''', {'tearOffAccessText': tearOffAccessText,
-       'tearOffGlobalObject': tearOffGlobalObject,
-       'tearOffGlobalObjectString': tearOffGlobalObjectString});
+}''',
+        {
+          'tearOffAccessText': tearOffAccessText,
+          'tearOffGlobalObject': tearOffGlobalObject,
+          'tearOffGlobalObjectString': tearOffGlobalObjectString
+        });
   } else {
-    tearOffGetter = js.statement('''
+    tearOffGetter = js.statement(
+        '''
       function tearOffGetter(funcs, reflectionInfo, name, isIntercepted) {
         var cache = null;
         return isIntercepted
             ? function(x) {
                 if (cache === null) cache = #(
                     this, funcs, reflectionInfo, false, [x], name);
                 return new cache(this, funcs[0], x, name);
               }
             : function() {
                 if (cache === null) cache = #(
                     this, funcs, reflectionInfo, false, [], name);
                 return new cache(this, funcs[0], null, name);
               };
-      }''', [tearOffAccessExpression, tearOffAccessExpression]);
+      }''',
+        [tearOffAccessExpression, tearOffAccessExpression]);
   }
 
-  jsAst.Statement tearOff = js.statement('''
+  jsAst.Statement tearOff = js.statement(
+      '''
     function tearOff(funcs, reflectionInfo, isStatic, name, isIntercepted) {
       var cache;
       return isStatic
           ? function() {
               if (cache === void 0) cache = #tearOff(
                   this, funcs, reflectionInfo, true, [], name).prototype;
               return cache;
             }
           : tearOffGetter(funcs, reflectionInfo, name, isIntercepted);
-    }''',  {'tearOff': tearOffAccessExpression});
+    }''',
+      {'tearOff': tearOffAccessExpression});
 
   return <jsAst.Statement>[tearOffGetter, tearOff];
 }