kjs/reference.h

   1 // -*- c-basic-offset: 4 -*-
   2 /*
   3  *  This file is part of the KDE libraries
   4  *  Copyright (C) 2007 Maksim Orlovich (maksim@kde.org)
   5  *
   6  *  This library is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU Library General Public
   8  *  License as published by the Free Software Foundation; either
   9  *  version 2 of the License, or (at your option) any later version.
  10  *
  11  *  This library is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *  Library General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Library General Public License
  17  *  along with this library; see the file COPYING.LIB.  If not, write to
  18  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  *  Boston, MA 02110-1301, USA.
  20  *
  21  */
  22
  23 #ifndef REFERENCE_H
  24 #define REFERENCE_H
  25
  26 #include "object.h"
  27 #include "property_slot.h"
  28
  29 namespace KJS {
  30
  31 struct Reference {
  32     //### some protection here!
  33     PropertySlot  propertySlot;
  34     bool          found; //note: should fit into padding of above..
  35
  36     JSObject*     base;  //This isn't the same as slot's base,
  37                          //as that may be different in case prototypes are involved..
  38     Identifier    ident;
  39
  40     Reference() { }
  41
  42     Reference(const Identifier& i) : ident(i) { }
  43
  44     // Note: for references, we make sure the slot points to the outer
  45     // scope if lookup failed..
  46     JSValue* read(ExecState* exec) {
  47         return propertySlot.getValue(exec, base, ident);
  48     }
  49
  50     void write(ExecState* exec, JSValue* val) {
  51          if (JSValue** loc = propertySlot.getDirectWriteLocation())
  52              *loc = val;
  53          else
  54             base->put(exec, ident, val);
  55     }
  56
  57     bool deleteProperty(ExecState* exec) {
  58         return base->deleteProperty(exec, ident);
  59     }
  60 };
  61
  62 }
  63
  64 #endif
  65
  66 // kate: indent-width 4; replace-tabs on; tab-width 4; space-indent on;