gecko/dom/base/nsDOMClassInfoID.h

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/**
 * This file defines enum values for all of the DOM objects which have
 * an entry in nsDOMClassInfo.
 */

#ifndef nsDOMClassInfoID_h__
#define nsDOMClassInfoID_h__

#define DOMCI_CLASS(_dom_class)                                               \
  eDOMClassInfo_##_dom_class##_id,

enum nsDOMClassInfoID {

#include "nsDOMClassInfoClasses.h"

  // This one better be the last one in this list
  eDOMClassInfoIDCount
};

#undef DOMCI_CLASS

/**
 * nsIClassInfo helper macros
 */

/**
 * DOMCI_CASTABLE_INTERFACES contains the list of interfaces that we have a bit
 * for in nsDOMClassInfo's mInterfacesBitmap. To use it you need to define
 * DOMCI_CASTABLE_INTERFACE(interface, bit, extra) and then call
 * DOMCI_CASTABLE_INTERFACES(extra). For every interface there will be one
 * call to DOMCI_CASTABLE_INTERFACE with the bit that it corresponds to and
 * the extra argument that was passed in to DOMCI_CASTABLE_INTERFACES.
 *
 * WARNING: Be very careful when adding interfaces to this list. Every object
 *          that implements one of these interfaces must be directly castable
 *          to that interface from the *canonical* nsISupports!
 */
#define DOMCI_CASTABLE_INTERFACES(_extra)                                     \
DOMCI_CASTABLE_INTERFACE(nsINode, 0, _extra)                                  \
DOMCI_CASTABLE_INTERFACE(nsIContent, 1, _extra)                               \
DOMCI_CASTABLE_INTERFACE(nsIDocument, 2, _extra)                              \
DOMCI_CASTABLE_INTERFACE(nsINodeList, 3, _extra)                              \
DOMCI_CASTABLE_INTERFACE(nsICSSDeclaration, 4, _extra)


#ifdef _IMPL_NS_LAYOUT

#define DOMCI_CLASS(_dom_class)                                               \
  extern const PRUint32 kDOMClassInfo_##_dom_class##_interfaces;

#include "nsDOMClassInfoClasses.h"

#undef DOMCI_CLASS

/**
 * We define two functions for every interface in DOMCI_CASTABLE_INTERFACES.
 * One takes a void* and one takes an nsIFoo*. These are used to compute the
 * bitmap for a given class. If the class doesn't implement the interface then
 * the void* variant will be called and we'll return 0, otherwise the nsIFoo*
 * variant will be called and we'll return (1 << bit).
 */
#define DOMCI_CASTABLE_INTERFACE(_interface, _bit, _extra)                    \
class _interface;                                                             \
inline PRUint32 Implements_##_interface(_interface *foo)                      \
  { return 1 << _bit; }                                                       \
inline PRUint32 Implements_##_interface(void *foo)                            \
  { return 0; }

DOMCI_CASTABLE_INTERFACES(unused)

#undef DOMCI_CASTABLE_INTERFACE

/**
 * Here we calculate the bitmap for a given class. We'll call the functions
 * defined above with (_class*)nsnull. If the class implements an interface,
 * that function will return (1 << bit), if it doesn't the function returns 0.
 * We just make the sum of all the values returned from the functions to
 * generate the bitmap.
 */
#define DOMCI_CASTABLE_INTERFACE(_interface, _bit, _class)                    \
  Implements_##_interface((_class*)nsnull) +

#define DOMCI_DATA(_dom_class, _class)                                        \
const PRUint32 kDOMClassInfo_##_dom_class##_interfaces =                      \
  DOMCI_CASTABLE_INTERFACES(_class)                                           \
  0;

class nsIClassInfo;
class nsXPCClassInfo;

extern nsIClassInfo*
NS_GetDOMClassInfoInstance(nsDOMClassInfoID aID);

#define NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(_class)                          \
  if (aIID.Equals(NS_GET_IID(nsIClassInfo)) ||                                \
      aIID.Equals(NS_GET_IID(nsXPCClassInfo))) {                              \
    foundInterface = NS_GetDOMClassInfoInstance(eDOMClassInfo_##_class##_id); \
    if (!foundInterface) {                                                    \
      *aInstancePtr = nsnull;                                                 \
      return NS_ERROR_OUT_OF_MEMORY;                                          \
    }                                                                         \
  } else

#else

// See nsIDOMClassInfo.h

#endif // _IMPL_NS_LAYOUT

#endif // nsDOMClassInfoID_h__