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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef GLK_QUEST_LIMIT_STACK
#define GLK_QUEST_LIMIT_STACK
namespace Glk {
namespace Quest {
template <class T> class LimitStack {
uint stack_size, cur_ptr, end_ptr;
Common::Array<T> data;
//bool last_push;
uint dofwd(uint i) const {
i ++;
return i == stack_size ? 0 : i;
}
uint dobwd(uint i) const {
return (i == 0 ? stack_size : i) - 1;
}
void fwd(uint &i) const {
i = dofwd(i);
}
void bwd(uint &i) const {
i = dobwd(i);
}
/*
void fwd (uint &i) { i ++; if (i == stack_size) i = 0; }
void bwd (uint &i) { i = (i == 0 ? stack_size : i) - 1; }
uint dofwd (uint i) { uint rv = i; fwd(rv); return rv; }
uint dobwd (uint i) { uint rv = i; bwd(rv); return rv; }
*/
public:
LimitStack(uint maxSize) : stack_size(maxSize), cur_ptr(0), end_ptr(maxSize - 1), data(Common::Array<T> (maxSize)) { }
void push(T &item) {
if (cur_ptr == end_ptr)
fwd(end_ptr);
data[cur_ptr] = item;
fwd(cur_ptr);
}
T &pop() {
assert(!is_empty());
bwd(cur_ptr);
return data[cur_ptr];
}
bool is_empty() {
return dobwd(cur_ptr) == end_ptr;
}
uint size() {
if (cur_ptr > end_ptr)
return cur_ptr - end_ptr - 1;
else
return (cur_ptr + stack_size) - end_ptr - 1;
}
void dump(Common::WriteStream &o) {
o << size() << ": < ";
for (uint i = dobwd(cur_ptr); i != end_ptr; bwd(i))
o << data[i] << " ";
o << ">";
}
T &peek() {
return data[dobwd(cur_ptr)];
}
};
template<class T> Common::WriteStream &operator<< (Common::WriteStream &o, LimitStack<T> st) {
st.dump(o);
return o;
}
} // End of namespace Quest
} // End of namespace Glk
#endif
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