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/********************* */
/*! \file sygus_print_callback.cpp
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds, Haniel Barbosa
** This file is part of the CVC4 project.
** Copyright (c) 2009-2018 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 Implementation of sygus print callbacks
**/
#include "printer/sygus_print_callback.h"
#include "expr/node.h"
#include "printer/printer.h"
using namespace CVC4::kind;
using namespace std;
namespace CVC4 {
namespace printer {
SygusExprPrintCallback::SygusExprPrintCallback(Expr body,
std::vector<Expr>& args)
: d_body(body), d_body_argument(-1)
{
d_args.insert(d_args.end(), args.begin(), args.end());
for (unsigned i = 0, size = d_args.size(); i < size; i++)
{
if (d_args[i] == d_body)
{
d_body_argument = static_cast<int>(i);
}
}
}
void SygusExprPrintCallback::doStrReplace(std::string& str,
const std::string& oldStr,
const std::string& newStr) const
{
size_t pos = 0;
while ((pos = str.find(oldStr, pos)) != std::string::npos)
{
str.replace(pos, oldStr.length(), newStr);
pos += newStr.length();
}
}
void SygusExprPrintCallback::toStreamSygus(const Printer* p,
std::ostream& out,
Expr e) const
{
// optimization: if body is equal to an argument, then just print that one
if (d_body_argument >= 0)
{
p->toStreamSygus(out, Node::fromExpr(e[d_body_argument]));
}
else
{
// make substitution
std::vector<Node> vars;
std::vector<Node> subs;
for (unsigned i = 0, size = d_args.size(); i < size; i++)
{
vars.push_back(Node::fromExpr(d_args[i]));
std::stringstream ss;
ss << "_setpc_var_" << i;
Node lv = NodeManager::currentNM()->mkBoundVar(
ss.str(), TypeNode::fromType(d_args[i].getType()));
subs.push_back(lv);
}
// the substituted body should be a non-sygus term
Node sbody = Node::fromExpr(d_body);
sbody =
sbody.substitute(vars.begin(), vars.end(), subs.begin(), subs.end());
std::stringstream body_out;
body_out << sbody;
// do string substitution
Assert(e.getNumChildren() == d_args.size());
std::string str_body = body_out.str();
for (unsigned i = 0, size = d_args.size(); i < size; i++)
{
std::stringstream old_str;
old_str << subs[i];
std::stringstream new_str;
p->toStreamSygus(new_str, Node::fromExpr(e[i]));
doStrReplace(str_body, old_str.str().c_str(), new_str.str().c_str());
}
out << str_body;
}
}
SygusLetExprPrintCallback::SygusLetExprPrintCallback(
Expr let_body, std::vector<Expr>& let_args, unsigned ninput_args)
: SygusExprPrintCallback(let_body, let_args),
d_num_let_input_args(ninput_args)
{
}
void SygusLetExprPrintCallback::toStreamSygus(const Printer* p,
std::ostream& out,
Expr e) const
{
std::stringstream let_out;
// print as let term
if (d_num_let_input_args > 0)
{
let_out << "(let (";
}
std::vector<Node> subs_lvs;
std::vector<Node> new_lvs;
for (unsigned i = 0, size = d_args.size(); i < size; i++)
{
Node v = d_args[i];
subs_lvs.push_back(v);
std::stringstream ss;
ss << "_l_" << new_lvs.size();
Node lv = NodeManager::currentNM()->mkBoundVar(ss.str(), v.getType());
new_lvs.push_back(lv);
// map free variables to proper terms
if (i < d_num_let_input_args)
{
// it should be printed as a let argument
let_out << "(";
let_out << lv << " " << lv.getType() << " ";
p->toStreamSygus(let_out, e[i]);
let_out << ")";
}
}
if (d_num_let_input_args > 0)
{
let_out << ") ";
}
// print the body
Node slet_body = Node::fromExpr(d_body);
slet_body = slet_body.substitute(
subs_lvs.begin(), subs_lvs.end(), new_lvs.begin(), new_lvs.end());
// new_lvs.insert(new_lvs.end(), lvs.begin(), lvs.end());
p->toStreamSygus(let_out, slet_body);
if (d_num_let_input_args > 0)
{
let_out << ")";
}
// do variable substitutions since
// ASSUMING : let_vars are interpreted literally and do not represent a class
// of variables
std::string lbody = let_out.str();
for (unsigned i = 0, size = d_args.size(); i < size; i++)
{
std::stringstream old_str;
old_str << new_lvs[i];
std::stringstream new_str;
if (i >= d_num_let_input_args)
{
p->toStreamSygus(new_str, Node::fromExpr(e[i]));
}
else
{
new_str << d_args[i];
}
doStrReplace(lbody, old_str.str().c_str(), new_str.str().c_str());
}
out << lbody;
}
SygusNamedPrintCallback::SygusNamedPrintCallback(std::string name)
: d_name(name)
{
}
void SygusNamedPrintCallback::toStreamSygus(const Printer* p,
std::ostream& out,
Expr e) const
{
if (e.getNumChildren() > 0)
{
out << "(";
}
out << d_name;
if (e.getNumChildren() > 0)
{
for (Expr ec : e)
{
out << " ";
p->toStreamSygus(out, ec);
}
out << ")";
}
}
void SygusEmptyPrintCallback::toStreamSygus(const Printer* p,
std::ostream& out,
Expr e) const
{
if (e.getNumChildren() == 1)
{
p->toStreamSygus(out, e[0]);
}
else
{
Assert(false);
}
}
std::shared_ptr<SygusEmptyPrintCallback> SygusEmptyPrintCallback::d_empty_pc = nullptr;
} /* CVC4::printer namespace */
} /* CVC4 namespace */
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