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/********************* */
/*! \file sexpr.h
** \verbatim
** Original author: cconway
** Major contributors: mdeters
** Minor contributors (to current version): none
** This file is part of the CVC4 prototype.
** Copyright (c) 2009, 2010, 2011 The Analysis of Computer Systems Group (ACSys)
** Courant Institute of Mathematical Sciences
** New York University
** See the file COPYING in the top-level source directory for licensing
** information.\endverbatim
**
** \brief Simple representation of SMT S-expressions.
**
** Simple representation of SMT S-expressions.
**/
#include "cvc4_public.h"
#ifndef __CVC4__SEXPR_H
#define __CVC4__SEXPR_H
#include <vector>
#include <string>
#include "util/Assert.h"
namespace CVC4 {
/**
* A simple S-expression. An S-expression is either an atom with a
* string value, or a list of other S-expressions.
*/
class CVC4_PUBLIC SExpr {
enum SexprTypes {
SEXPR_STRING,
SEXPR_INTEGER,
SEXPR_RATIONAL,
SEXPR_NOT_ATOM
} d_sexprType;
friend std::ostream &operator<<(std::ostream&, SexprTypes);
/** The value of an atomic integer-valued S-expression. */
Integer d_integerValue;
/** The value of an atomic rational-valued S-expression. */
Rational d_rationalValue;
/** The value of an atomic S-expression. */
std::string d_stringValue;
/** The children of a list S-expression. */
std::vector<SExpr> d_children;
public:
SExpr() :
d_sexprType(SEXPR_STRING),
d_integerValue(0),
d_rationalValue(0),
d_stringValue(""),
d_children() {
}
SExpr(const Integer& value) :
d_sexprType(SEXPR_INTEGER),
d_integerValue(value),
d_rationalValue(0),
d_stringValue(""),
d_children() {
}
SExpr(const Rational& value) :
d_sexprType(SEXPR_RATIONAL),
d_integerValue(0),
d_rationalValue(value),
d_stringValue(""),
d_children() {
}
SExpr(const std::string& value) :
d_sexprType(SEXPR_STRING),
d_integerValue(0),
d_rationalValue(0),
d_stringValue(value),
d_children() {
}
SExpr(const std::vector<SExpr> children) :
d_sexprType(SEXPR_NOT_ATOM),
d_integerValue(0),
d_rationalValue(0),
d_stringValue(""),
d_children(children) {
}
/** Is this S-expression an atom? */
bool isAtom() const;
/** Is this S-expression an integer? */
bool isInteger() const;
/** Is this S-expression a rational? */
bool isRational() const;
/** Is this S-expression a string? */
bool isString() const;
/**
* Get the string value of this S-expression. This will cause an
* error if this S-expression is not an atom.
*/
const std::string getValue() const;
/**
* Get the integer value of this S-expression. This will cause an
* error if this S-expression is not an integer.
*/
const Integer& getIntegerValue() const;
/**
* Get the rational value of this S-expression. This will cause an
* error if this S-expression is not a rational.
*/
const Rational& getRationalValue() const;
/**
* Get the children of this S-expression. This will cause an error
* if this S-expression is not a list.
*/
const std::vector<SExpr> getChildren() const;
};/* class SExpr */
inline std::ostream &operator<<(std::ostream& out, SExpr::SexprTypes type){
switch(type){
case SExpr::SEXPR_STRING:
out << "SEXPR_STRING";
break;
case SExpr::SEXPR_INTEGER:
out << "SEXPR_INTEGER";
break;
case SExpr::SEXPR_RATIONAL:
out << "SEXPR_RATIONAL";
break;
case SExpr::SEXPR_NOT_ATOM:
out << "SEXPR_NOT_ATOM";
break;
default:
Unimplemented();
break;
}
return out;
}
inline bool SExpr::isAtom() const {
return d_sexprType != SEXPR_NOT_ATOM;
}
inline bool SExpr::isInteger() const {
return d_sexprType == SEXPR_INTEGER;
}
inline bool SExpr::isRational() const {
return d_sexprType == SEXPR_RATIONAL;
}
inline bool SExpr::isString() const {
return d_sexprType == SEXPR_STRING;
}
inline const std::string SExpr::getValue() const {
AlwaysAssert( isAtom() );
switch(d_sexprType) {
case SEXPR_INTEGER:
return d_integerValue.toString();
case SEXPR_RATIONAL:
return d_rationalValue.toString();
case SEXPR_STRING:
return d_stringValue;
default:
Unhandled(d_sexprType);
}
return d_stringValue;
}
inline const Integer& SExpr::getIntegerValue() const {
AlwaysAssert( isInteger() );
return d_integerValue;
}
inline const Rational& SExpr::getRationalValue() const {
AlwaysAssert( isRational() );
return d_rationalValue;
}
inline const std::vector<SExpr> SExpr::getChildren() const {
AlwaysAssert( !isAtom() );
return d_children;
}
inline std::ostream& operator<<(std::ostream& out, const SExpr& sexpr) {
if( sexpr.isAtom() ) {
out << sexpr.getValue();
} else {
std::vector<SExpr> children = sexpr.getChildren();
out << "(";
bool first = true;
for( std::vector<SExpr>::iterator it = children.begin();
it != children.end();
++it ) {
if( first ) {
first = false;
} else {
out << " ";
}
out << *it;
}
out << ")";
}
return out;
}
}/* CVC4 namespace */
#endif /* __CVC4__SEXPR_H */
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