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/********************* */
/*! \file evaluator.h
** \verbatim
** Top contributors (to current version):
** Andres Noetzli
** This file is part of the CVC4 project.
** Copyright (c) 2009-2017 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief The Evaluator class
**
** The Evaluator class.
**/
#include "cvc4_private.h"
#pragma once
#include <utility>
#include <vector>
#include "base/output.h"
#include "expr/node.h"
#include "util/bitvector.h"
#include "util/rational.h"
#include "util/regexp.h"
namespace CVC4 {
namespace theory {
struct EvalResult
{
enum
{
BOOL,
BITVECTOR,
RATIONAL,
STRING,
INVALID
} d_tag;
union
{
bool d_bool;
BitVector d_bv;
Rational d_rat;
String d_str;
};
EvalResult(const EvalResult& other)
{
d_tag = other.d_tag;
switch (d_tag)
{
case BOOL: d_bool = other.d_bool; break;
case BITVECTOR:
new (&d_bv) BitVector;
d_bv = other.d_bv;
break;
case RATIONAL:
new (&d_rat) Rational;
d_rat = other.d_rat;
break;
case STRING:
new (&d_str) String;
d_str = other.d_str;
break;
case INVALID: break;
}
}
EvalResult() : d_tag(INVALID) {}
EvalResult(bool b) : d_tag(BOOL), d_bool(b) {}
EvalResult(const BitVector& bv) : d_tag(BITVECTOR), d_bv(bv) {}
EvalResult(const Rational& i) : d_tag(RATIONAL), d_rat(i) {}
EvalResult(const String& str) : d_tag(STRING), d_str(str) {}
EvalResult& operator=(const EvalResult& other)
{
if (this != &other)
{
d_tag = other.d_tag;
switch (d_tag)
{
case BOOL: d_bool = other.d_bool; break;
case BITVECTOR:
new (&d_bv) BitVector;
d_bv = other.d_bv;
break;
case RATIONAL:
new (&d_rat) Rational;
d_rat = other.d_rat;
break;
case STRING:
new (&d_str) String;
d_str = other.d_str;
break;
case INVALID: break;
}
}
return *this;
}
~EvalResult()
{
switch (d_tag)
{
case BITVECTOR:
{
d_bv.~BitVector();
break;
}
case RATIONAL:
{
d_rat.~Rational();
break;
}
case STRING:
{
d_str.~String();
break;
default: break;
}
}
}
Node toNode()
{
NodeManager* nm = NodeManager::currentNM();
switch (d_tag)
{
case EvalResult::BOOL: return nm->mkConst(d_bool);
case EvalResult::BITVECTOR: return nm->mkConst(d_bv);
case EvalResult::RATIONAL: return nm->mkConst(d_rat);
case EvalResult::STRING: return nm->mkConst(d_str);
default:
{
Trace("evaluator") << "Missing conversion from " << d_tag << " to node"
<< std::endl;
return Node();
}
}
return Node();
}
};
class Evaluator
{
public:
Node eval(TNode n,
const std::vector<Node>& args,
const std::vector<Node>& vals);
private:
EvalResult evalInternal(TNode n,
const std::vector<Node>& args,
const std::vector<Node>& vals);
};
} // namespace theory
} // namespace CVC4
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