Implement cascade operator in VM

runtime/vm/parser.h

 // 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.
 
 #ifndef VM_PARSER_H_
 #define VM_PARSER_H_
 
 #include "include/dart_api.h"
 
 #include "vm/ast.h"
@@ skipping 396 matching lines @@
   bool IsVariableDeclaration();
   bool IsFunctionDeclaration();
   bool IsFunctionLiteral();
   bool IsForInStatement();
   bool IsTopLevelAccessor();
 
   AstNode* ParseBinaryExpr(int min_preced);
   LiteralNode* ParseConstExpr();
   static const bool kRequireConst = true;
   static const bool kAllowConst = false;
-  AstNode* ParseExpr(bool require_compiletime_const);
+  static const bool kConsumeCascades = true;
+  static const bool kNoCascades = false;
+  AstNode* ParseExpr(bool require_compiletime_const, bool consume_cascades);
   AstNode* ParseExprList();
   AstNode* ParseConditionalExpr();
   AstNode* ParseUnaryExpr();
   AstNode* ParsePostfixExpr();
+  AstNode* ParseSelectors(AstNode* primary, bool is_cascade);
+  AstNode* ParseCascades(AstNode* expr);
   AstNode* ParsePrimary();
   AstNode* ParseStringLiteral();
   String* ParseImportStringLiteral();
   AstNode* ParseCompoundLiteral();
   AstNode* ParseListLiteral(intptr_t type_pos,
                             bool is_const,
                             const AbstractTypeArguments& type_arguments);
   AstNode* ParseMapLiteral(intptr_t type_pos,
                            bool is_const,
                            const AbstractTypeArguments& type_arguments);
   AstNode* ParseNewOperator();
 
   // An implicit argument, if non-null, is prepended to the returned list.
   ArgumentListNode* ParseActualParameters(ArgumentListNode* implicit_arguments,
                                           bool require_const);
   AstNode* ParseStaticCall(const Class& cls,
                            const String& method_name,
                            intptr_t ident_pos);
   AstNode* ParseInstanceCall(AstNode* receiver, const String& method_name);
   AstNode* ParseClosureCall(AstNode* closure);
   AstNode* ParseInstanceFieldAccess(AstNode* receiver,
-                                    const String& field_name);
+                                    const String& field_name,
+                                    bool consume_cascades);
   AstNode* GenerateStaticFieldLookup(const Field& field,
                                      intptr_t ident_pos);
   AstNode* ParseStaticFieldAccess(const Class& cls,
                                   const String& field_name,
-                                  intptr_t ident_pos);
+                                  intptr_t ident_pos,
+                                  bool consume_cascades);
 
   LocalVariable* LookupLocalScope(const String& ident);
   void CheckInstanceFieldAccess(intptr_t field_pos, const String& field_name);
   RawClass* TypeParametersScopeClass();
   bool IsInstantiatorRequired() const;
   bool IsDefinedInLexicalScope(const String& ident);
   bool ResolveIdentInLocalScope(intptr_t ident_pos,
                                 const String &ident,
                                 AstNode** node);
   static const bool kResolveLocally = true;
@@ skipping 89 matching lines @@
 
   // Allocate temporary only once per function.
   LocalVariable* expression_temp_;
 
   DISALLOW_COPY_AND_ASSIGN(Parser);
 };
 
 }  // namespace dart
 
 #endif  // VM_PARSER_H_