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// Copyright (c) 1994 James Clark
// See the file COPYING for copying permission.
#ifndef Undo_INCLUDED
#define Undo_INCLUDED 1
#ifdef __GNUG__
#pragma interface
#endif
#include "Link.h"
#include "ContentToken.h"
#include "OpenElement.h"
#include "Allocator.h"
#ifdef SP_NAMESPACE
namespace SP_NAMESPACE {
#endif
class ParserState;
class Event;
class Undo : public Link {
public:
void *operator new(size_t sz, Allocator &alloc) { return alloc.alloc(sz); }
void *operator new(size_t sz) { return Allocator::allocSimple(sz); }
void operator delete(void *p) { Allocator::free(p); }
#ifdef SP_HAVE_PLACEMENT_OPERATOR_DELETE
void operator delete(void *p, Allocator &) { Allocator::free(p); }
#endif
Undo();
virtual ~Undo();
virtual void undo(ParserState *) = 0;
private:
Undo(const Undo &); // undefined
void operator=(const Undo &); // undefined
};
class UndoTransition : public Undo {
public:
UndoTransition(const MatchState &);
void undo(ParserState *);
private:
UndoTransition(const UndoTransition &); // undefined
void operator=(const UndoTransition &); // undefined
MatchState state_;
};
class UndoStartTag : public Undo {
public:
UndoStartTag();
void undo(ParserState *);
private:
UndoStartTag(const UndoStartTag &); // undefined
void operator=(const UndoStartTag &); // undefined
};
class UndoEndTag : public Undo {
public:
UndoEndTag(OpenElement *);
void undo(ParserState *);
private:
UndoEndTag(const UndoEndTag &); // undefined
void operator=(const UndoEndTag &); // undefined
Owner<OpenElement> element_;
};
#ifdef SP_NAMESPACE
}
#endif
#endif /* not Undo_INCLUDED */
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