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/*************************************************************************
*
* HTCd - Copyright (C) 1998-2006 Henrik Rydberg
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef EXPRESSH
#define EXPRESSH
#include <ops/operator.h>
#include <mt/split.h>
#include <mt/uniheap.h>
const int OP_LOCAL=1;
const int OP_GLOBAL=2;
const int OP_NINIT=4;
const int OP_ALL=OP_LOCAL|OP_GLOBAL|OP_NINIT;
class expr_t {
public:
sref expr;
const op_t* op;
int status;
mstring result;
expr_t *left,*right;
expr_t():
expr(),op(0),status(OP_ALL),result(),left(0),right(0) {}
expr_t(const expr_t& x):
expr(),op(0),status(OP_ALL),result(),left(0),right(0) { copy(x); }
expr_t(const sref& s):
expr(s),op(0),status(OP_ALL),result(),left(0),right(0) {}
expr_t(const sref& s,const op_t* o):
expr(s),op(o),status(OP_ALL),result(),left(0),right(0) {}
expr_t(const sref& s,const op_t* o,expr_t* p):
expr(s),op(o),status(OP_ALL),result(),left(p),right(0) {}
~expr_t() { delete left; delete right; }
void clear();
expr_t& operator=(const expr_t& x) { clear(); copy(x); return *this; }
expr_t& operator=(const sref& in) { clear(); expr=in; return *this; }
void trav(mstream& out,int n);
void expand(op_env& env) throw(merror_t);
void eval(mstream& out,op_env& env,int opt) throw(merror_t);
static void* operator new(size_t n);
static void operator delete(void* p);
protected:
void copy(const expr_t& x);
static uniheap<36> tree;
};
////////////////////////////////////////////////////////////
struct op_env {
opmap* ops;
op_env() : ops(0) {}
op_env(opmap& map) : ops(&map) {}
virtual int split(sref& first,sref& rest) throw(merror_t) { return 0; }
virtual void term(mstream& out,expr_t* x) throw(merror_t) { x->status=0; }
};
#endif
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