[es6] parse destructuring assignment

src/parser.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_PARSER_H_
 #define V8_PARSER_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/compiler.h"  // TODO(titzer): remove this include dependency
@@ skipping 819 matching lines @@
   V8_INLINE ZoneList<v8::internal::Expression*>* PrepareSpreadArguments(
       ZoneList<v8::internal::Expression*>* list);
   V8_INLINE void MaterializeUnspreadArgumentsLiterals(int count) {}
   V8_INLINE Expression* SpreadCall(Expression* function,
                                    ZoneList<v8::internal::Expression*>* args,
                                    int pos);
   V8_INLINE Expression* SpreadCallNew(Expression* function,
                                       ZoneList<v8::internal::Expression*>* args,
                                       int pos);
 
+  inline Expression* RewriteDestructuringAssignment(Expression* expr, bool* ok);
+
  private:
   Parser* parser_;
 };
 
 
 class Parser : public ParserBase<ParserTraits> {
  public:
   explicit Parser(ParseInfo* info);
   ~Parser() {
     delete reusable_preparser_;
@@ skipping 207 matching lines @@
   // Initialize the components of a for-in / for-of statement.
   void InitializeForEachStatement(ForEachStatement* stmt,
                                   Expression* each,
                                   Expression* subject,
                                   Statement* body);
   Statement* DesugarLexicalBindingsInForStatement(
       Scope* inner_scope, bool is_const, ZoneList<const AstRawString*>* names,
       ForStatement* loop, Statement* init, Expression* cond, Statement* next,
       Statement* body, bool* ok);
 
+  Expression* DesugarDestructuringAssignment(Expression* expr, bool* ok);
+
   FunctionLiteral* ParseFunctionLiteral(
       const AstRawString* name, Scanner::Location function_name_location,
       bool name_is_strict_reserved, FunctionKind kind,
       int function_token_position, FunctionLiteral::FunctionType type,
       FunctionLiteral::ArityRestriction arity_restriction, bool* ok);
 
 
   ClassLiteral* ParseClassLiteral(const AstRawString* name,
                                   Scanner::Location class_name_location,
                                   bool name_is_strict_reserved, int pos,
@@ skipping 208 matching lines @@
     // TODO(sigurds) Mark every parameter as maybe assigned. This is a
     // conservative approximation necessary to account for parameters
     // that are assigned via the arguments array.
     var->set_maybe_assigned();
   }
   if (is_duplicate) {
     classifier->RecordDuplicateFormalParameterError(
         parser_->scanner()->location());
   }
 }
+
+
+inline Expression* ParserTraits::RewriteDestructuringAssignment(
+    Expression* expr, bool* ok) {
+  return parser_->DesugarDestructuringAssignment(expr, ok);
+}
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_