Support compilation of Hello World

pkg/compiler/lib/src/elements/elements.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.
 
 library elements;
 
 import '../common.dart';
 import '../common/resolution.dart' show Resolution;
 import '../compiler.dart' show Compiler;
 import '../constants/constructors.dart';
@@ skipping 311 matching lines @@
   /// `true` if this element is a method, getter, setter or field that
   /// is declared `static`.
   bool get isStatic;
 
   /// `true` if this element is local element, that is, a local variable,
   /// local function or parameter.
   bool get isLocal;
 
   bool get impliesType;
 
+  /// The character offset of the declaration of this element within its
+  /// compilation unit, if available.
+  ///
+  /// This is used to sort the elements.
+  int get sourceOffset;
+
   // TODO(johnniwinther): Remove this.
   Token get position;
 
   /// The position of the declaration of this element, if available.
   SourceSpan get sourcePosition;
 
   CompilationUnitElement get compilationUnit;
   LibraryElement get library;
   LibraryElement get implementationLibrary;
   ClassElement get enclosingClass;
@@ skipping 334 matching lines @@
   }
 
   /// A `compareTo` function that places [Element]s in a consistent order based
   /// on the source code order.
   static int compareByPosition(Element a, Element b) {
     if (identical(a, b)) return 0;
     int r = a.library.compareTo(b.library);
     if (r != 0) return r;
     r = a.compilationUnit.compareTo(b.compilationUnit);
     if (r != 0) return r;
-    Token positionA = a.position;
-    Token positionB = b.position;
-    int offsetA = positionA == null ? -1 : positionA.charOffset;
-    int offsetB = positionB == null ? -1 : positionB.charOffset;
+    int offsetA = a.sourceOffset ?? -1;
+    int offsetB = b.sourceOffset ?? -1;
     r = offsetA.compareTo(offsetB);
     if (r != 0) return r;
     r = a.name.compareTo(b.name);
     if (r != 0) return r;
     // Same file, position and name.  If this happens, we should find out why
     // and make the order total and independent of hashCode.
     return a.hashCode.compareTo(b.hashCode);
   }
 
   static List<Element> sortedByPosition(Iterable<Element> elements) {
@@ skipping 521 matching lines @@
 /// A local function or closure (anonymous local function).
 abstract class LocalFunctionElement extends FunctionElement
     implements LocalElement {}
 
 /// A constructor.
 abstract class ConstructorElement extends FunctionElement
     implements MemberElement {
   /// The effective target of this constructor, that is the non-redirecting
   /// constructor that is called on invocation of this constructor.
   ///
-  /// Consider for instance this hierachy:
+  /// Consider for instance this hierarchy:
   ///
   ///     class C { factory C.c() = D.d; }
   ///     class D { factory D.d() = E.e2; }
   ///     class E { E.e1();
   ///               E.e2() : this.e1(); }
   ///
   /// The effective target of both `C.c`, `D.d`, and `E.e2` is `E.e2`, and the
   /// effective target of `E.e1` is `E.e1` itself.
   ConstructorElement get effectiveTarget;
 
   /// The immediate redirection target of a redirecting factory constructor.
   ///
-  /// Consider for instance this hierachy:
+  /// Consider for instance this hierarchy:
   ///
   ///     class C { factory C() = D; }
   ///     class D { factory D() = E; }
   ///     class E { E(); }
   ///
   /// The immediate redirection target of `C` is `D` and the immediate
   /// redirection target of `D` is `E`. `E` is not a redirecting factory
   /// constructor so its immediate redirection target is `null`.
   ConstructorElement get immediateRedirectionTarget;
 
@@ skipping 542 matching lines @@
   /// by a field.
   bool get isDeclaredByField;
 
   /// Returns `true` if this member is abstract.
   bool get isAbstract;
 
   /// If abstract, [implementation] points to the overridden concrete member,
   /// if any. Otherwise [implementation] points to the member itself.
   Member get implementation;
 }