dartfmt pkg/compiler

pkg/compiler/lib/src/js_backend/constant_emitter.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.
 
 part of js_backend;
 
 typedef jsAst.Expression _ConstantReferenceGenerator(ConstantValue constant);
 
 typedef jsAst.Expression _ConstantListGenerator(jsAst.Expression array);
 
 /**
  * Generates the JavaScript expressions for constants.
  *
  * It uses a given [constantReferenceGenerator] to reference nested constants
  * (if there are some). It is hence up to that function to decide which
  * constants should be inlined or not.
  */
-class ConstantEmitter
-    implements ConstantValueVisitor<jsAst.Expression, Null> {
-
+class ConstantEmitter implements ConstantValueVisitor<jsAst.Expression, Null> {
   // Matches blank lines, comment lines and trailing comments that can't be part
   // of a string.
   static final RegExp COMMENT_RE =
-      new RegExp(r'''^ *(//.*)?\n|  *//[^''"\n]*$''' , multiLine: true);
+      new RegExp(r'''^ *(//.*)?\n|  *//[^''"\n]*$''', multiLine: true);
 
   final Compiler compiler;
   final Namer namer;
   final _ConstantReferenceGenerator constantReferenceGenerator;
   final _ConstantListGenerator makeConstantList;
 
   /**
    * The given [constantReferenceGenerator] function must, when invoked with a
    * constant, either return a reference or return its literal expression if it
    * can be inlined.
@@ skipping 24 matching lines @@
     reporter.internalError(NO_LOCATION_SPANNABLE,
         "The function constant does not need specific JS code.");
     return null;
   }
 
   @override
   jsAst.Expression visitNull(NullConstantValue constant, [_]) {
     return new jsAst.LiteralNull();
   }
 
-  static final _exponentialRE = new RegExp(
-      '^'
-      '\([-+]?\)'         // 1: sign
-      '\([0-9]+\)'        // 2: leading digit(s)
+  static final _exponentialRE = new RegExp('^'
+      '\([-+]?\)' // 1: sign
+      '\([0-9]+\)' // 2: leading digit(s)
       '\(\.\([0-9]*\)\)?' // 4: fraction digits
-      'e\([-+]?[0-9]+\)'  // 5: exponent with sign
+      'e\([-+]?[0-9]+\)' // 5: exponent with sign
       r'$');
 
   /// Reduces the size of exponential representations when minification is
   /// enabled.
   ///
   /// Removes the "+" after the exponential sign, and removes the "." before the
   /// "e". For example `1.23e+5` is changed to `123e3`.
   String _shortenExponentialRepresentation(String numberString) {
     Match match = _exponentialRE.firstMatch(numberString);
     if (match == null) return numberString;
@@ skipping 62 matching lines @@
   }
 
   /**
    * Write the contents of the quoted string to a [CodeBuffer] in
    * a form that is valid as JavaScript string literal content.
    * The string is assumed quoted by double quote characters.
    */
   @override
   jsAst.Expression visitString(StringConstantValue constant, [_]) {
     return js.escapedString(constant.primitiveValue.slowToString(),
-                            ascii: true);
+        ascii: true);
   }
 
   @override
   jsAst.Expression visitList(ListConstantValue constant, [_]) {
     List<jsAst.Expression> elements = constant.entries
         .map(constantReferenceGenerator)
         .toList(growable: false);
     jsAst.ArrayInitializer array = new jsAst.ArrayInitializer(elements);
     jsAst.Expression value = makeConstantList(array);
     return maybeAddTypeArguments(constant.type, value);
@@ skipping 14 matching lines @@
         jsAst.Expression valueExpression =
             constantReferenceGenerator(constant.values[i]);
         properties.add(new jsAst.Property(keyExpression, valueExpression));
       }
       return new jsAst.ObjectInitializer(properties);
     }
 
     jsAst.Expression jsGeneralMap() {
       List<jsAst.Expression> data = <jsAst.Expression>[];
       for (int i = 0; i < constant.keys.length; i++) {
-        jsAst.Expression keyExpression = constantReferenceGenerator(constant.keys[i]);
+        jsAst.Expression keyExpression =
+            constantReferenceGenerator(constant.keys[i]);
         jsAst.Expression valueExpression =
             constantReferenceGenerator(constant.values[i]);
         data.add(keyExpression);
         data.add(valueExpression);
       }
       return new jsAst.ArrayInitializer(data);
     }
 
     ClassElement classElement = constant.type.element;
     String className = classElement.name;
 
     List<jsAst.Expression> arguments = <jsAst.Expression>[];
 
     // The arguments of the JavaScript constructor for any given Dart class
     // are in the same order as the members of the class element.
     int emittedArgumentCount = 0;
     classElement.implementation.forEachInstanceField(
         (ClassElement enclosing, Element field) {
-          if (field.name == JavaScriptMapConstant.LENGTH_NAME) {
-            arguments.add(
-                new jsAst.LiteralNumber('${constant.keyList.entries.length}'));
-          } else if (field.name == JavaScriptMapConstant.JS_OBJECT_NAME) {
-            arguments.add(jsMap());
-          } else if (field.name == JavaScriptMapConstant.KEYS_NAME) {
-            arguments.add(constantReferenceGenerator(constant.keyList));
-          } else if (field.name == JavaScriptMapConstant.PROTO_VALUE) {
-            assert(constant.protoValue != null);
-            arguments.add(constantReferenceGenerator(constant.protoValue));
-          } else if (field.name == JavaScriptMapConstant.JS_DATA_NAME) {
-            arguments.add(jsGeneralMap());
-          } else {
-            reporter.internalError(field,
-                "Compiler has unexpected field ${field.name} for "
-                "${className}.");
-          }
-          emittedArgumentCount++;
-        },
-        includeSuperAndInjectedMembers: true);
+      if (field.name == JavaScriptMapConstant.LENGTH_NAME) {
+        arguments
+            .add(new jsAst.LiteralNumber('${constant.keyList.entries.length}'));
+      } else if (field.name == JavaScriptMapConstant.JS_OBJECT_NAME) {
+        arguments.add(jsMap());
+      } else if (field.name == JavaScriptMapConstant.KEYS_NAME) {
+        arguments.add(constantReferenceGenerator(constant.keyList));
+      } else if (field.name == JavaScriptMapConstant.PROTO_VALUE) {
+        assert(constant.protoValue != null);
+        arguments.add(constantReferenceGenerator(constant.protoValue));
+      } else if (field.name == JavaScriptMapConstant.JS_DATA_NAME) {
+        arguments.add(jsGeneralMap());
+      } else {
+        reporter.internalError(
+            field,
+            "Compiler has unexpected field ${field.name} for "
+            "${className}.");
+      }
+      emittedArgumentCount++;
+    }, includeSuperAndInjectedMembers: true);
     if ((className == JavaScriptMapConstant.DART_STRING_CLASS &&
-         emittedArgumentCount != 3) ||
+            emittedArgumentCount != 3) ||
         (className == JavaScriptMapConstant.DART_PROTO_CLASS &&
-         emittedArgumentCount != 4) ||
+            emittedArgumentCount != 4) ||
         (className == JavaScriptMapConstant.DART_GENERAL_CLASS &&
-         emittedArgumentCount != 1)) {
+            emittedArgumentCount != 1)) {
       reporter.internalError(classElement,
           "Compiler and ${className} disagree on number of fields.");
     }
 
     jsAst.Expression constructor =
         backend.emitter.constructorAccess(classElement);
     jsAst.Expression value = new jsAst.New(constructor, arguments);
     return maybeAddTypeArguments(constant.type, value);
   }
 
   JavaScriptBackend get backend => compiler.backend;
 
   jsAst.PropertyAccess getHelperProperty(Element helper) {
     return backend.emitter.staticFunctionAccess(helper);
   }
 
   @override
   jsAst.Expression visitType(TypeConstantValue constant, [_]) {
     DartType type = constant.representedType;
     jsAst.Name typeName = namer.runtimeTypeName(type.element);
     return new jsAst.Call(getHelperProperty(backend.helpers.createRuntimeType),
-                          [js.quoteName(typeName)]);
+        [js.quoteName(typeName)]);
   }
 
   @override
   jsAst.Expression visitInterceptor(InterceptorConstantValue constant, [_]) {
     ClassElement interceptorClass = constant.dispatchedType.element;
     return backend.emitter.interceptorPrototypeAccess(interceptorClass);
   }
 
   @override
   jsAst.Expression visitSynthetic(SyntheticConstantValue constant, [_]) {
     switch (constant.kind) {
       case SyntheticConstantKind.DUMMY_INTERCEPTOR:
       case SyntheticConstantKind.EMPTY_VALUE:
         return new jsAst.LiteralNumber('0');
       case SyntheticConstantKind.TYPEVARIABLE_REFERENCE:
       case SyntheticConstantKind.NAME:
         return constant.payload;
       default:
         reporter.internalError(NO_LOCATION_SPANNABLE,
-                               "Unexpected DummyConstantKind ${constant.kind}");
+            "Unexpected DummyConstantKind ${constant.kind}");
         return null;
     }
   }
 
   @override
   jsAst.Expression visitConstructed(ConstructedConstantValue constant, [_]) {
     Element element = constant.type.element;
-    if (backend.isForeign(element)
-        && element.name == 'JS_CONST') {
+    if (backend.isForeign(element) && element.name == 'JS_CONST') {
       StringConstantValue str = constant.fields.values.single;
       String value = str.primitiveValue.slowToString();
       return new jsAst.LiteralExpression(stripComments(value));
     }
     jsAst.Expression constructor =
         backend.emitter.constructorAccess(constant.type.element);
-    List<jsAst.Expression> fields =
-        constant.fields.values.map(constantReferenceGenerator)
+    List<jsAst.Expression> fields = constant.fields.values
+        .map(constantReferenceGenerator)
         .toList(growable: false);
     jsAst.New instantiation = new jsAst.New(constructor, fields);
     return maybeAddTypeArguments(constant.type, instantiation);
   }
 
   String stripComments(String rawJavaScript) {
     return rawJavaScript.replaceAll(COMMENT_RE, '');
   }
 
-  jsAst.Expression maybeAddTypeArguments(InterfaceType type,
-                                         jsAst.Expression value) {
+  jsAst.Expression maybeAddTypeArguments(
+      InterfaceType type, jsAst.Expression value) {
     if (type is InterfaceType &&
         !type.treatAsRaw &&
         backend.classNeedsRti(type.element)) {
       InterfaceType interface = type;
       RuntimeTypesEncoder rtiEncoder = backend.rtiEncoder;
-      Iterable<jsAst.Expression> arguments = interface.typeArguments
-          .map((DartType type) =>
-              rtiEncoder.getTypeRepresentationWithPlaceholders(type, (_){}));
+      Iterable<jsAst.Expression> arguments = interface.typeArguments.map(
+          (DartType type) =>
+              rtiEncoder.getTypeRepresentationWithPlaceholders(type, (_) {}));
       jsAst.Expression argumentList =
           new jsAst.ArrayInitializer(arguments.toList());
       return new jsAst.Call(
           getHelperProperty(backend.helpers.setRuntimeTypeInfo),
           [value, argumentList]);
     }
     return value;
   }
 
   @override
   jsAst.Expression visitDeferred(DeferredConstantValue constant, [_]) {
     return constantReferenceGenerator(constant.referenced);
   }
 }