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include special functionality in parsers for solvers and opt for additional file formats

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-12-03 20:00:45 +01:00
parent 5ee30a3cd9
commit a83af22841
2 changed files with 345 additions and 0 deletions

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src/opt/opt_parse.cpp Normal file
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/*++
Copyright (c) 2017 Microsoft Corporation
Module Name:
opt_parse.cpp
Abstract:
Parse utilities for optimization.
Author:
Nikolaj Bjorner (nbjorner) 2017-11-19
Revision History:
--*/
#include "opt/opt_context.h"
#include "opt/opt_parse.h"
class opt_stream_buffer {
std::istream & m_stream;
int m_val;
unsigned m_line;
public:
opt_stream_buffer(std::istream & s):
m_stream(s),
m_line(0) {
m_val = m_stream.get();
}
int operator *() const { return m_val;}
void operator ++() { m_val = m_stream.get(); }
int ch() const { return m_val; }
void next() { m_val = m_stream.get(); }
bool eof() const { return ch() == EOF; }
unsigned line() const { return m_line; }
void skip_whitespace();
void skip_space();
void skip_line();
bool parse_token(char const* token);
int parse_int();
unsigned parse_unsigned();
};
void opt_stream_buffer::skip_whitespace() {
while ((ch() >= 9 && ch() <= 13) || ch() == 32) {
if (ch() == 10) ++m_line;
next();
}
}
void opt_stream_buffer::skip_space() {
while (ch() != 10 && ((ch() >= 9 && ch() <= 13) || ch() == 32)) {
next();
}
}
void opt_stream_buffer::skip_line() {
while(true) {
if (eof()) {
return;
}
if (ch() == '\n') {
++m_line;
next();
return;
}
next();
}
}
bool opt_stream_buffer::parse_token(char const* token) {
skip_whitespace();
char const* t = token;
while (ch() == *t) {
next();
++t;
}
return 0 == *t;
}
unsigned opt_stream_buffer::parse_unsigned() {
skip_space();
if (ch() == '\n') {
return UINT_MAX;
}
unsigned val = 0;
while (ch() >= '0' && ch() <= '9') {
val = val*10 + (ch() - '0');
next();
}
return val;
}
int opt_stream_buffer::parse_int() {
int val = 0;
bool neg = false;
skip_whitespace();
if (ch() == '-') {
neg = true;
next();
}
else if (ch() == '+') {
next();
}
if (ch() < '0' || ch() > '9') {
std::cerr << "(error line " << line() << " \"unexpected char: " << ((char)ch()) << "\" )\n";
exit(3);
}
while (ch() >= '0' && ch() <= '9') {
val = val*10 + (ch() - '0');
next();
}
return neg ? -val : val;
}
class wcnf {
opt::context& opt;
ast_manager& m;
opt_stream_buffer& in;
unsigned_vector& m_handles;
app_ref read_clause(unsigned& weight) {
int parsed_lit;
int var;
weight = in.parse_unsigned();
app_ref result(m), p(m);
expr_ref_vector ors(m);
while (true) {
parsed_lit = in.parse_int();
if (parsed_lit == 0)
break;
var = abs(parsed_lit);
p = m.mk_const(symbol(var), m.mk_bool_sort());
if (parsed_lit < 0) p = m.mk_not(p);
ors.push_back(p);
}
result = to_app(mk_or(m, ors.size(), ors.c_ptr()));
return result;
}
void parse_spec(unsigned& num_vars, unsigned& num_clauses, unsigned& max_weight) {
in.parse_token("wcnf");
num_vars = in.parse_unsigned();
num_clauses = in.parse_unsigned();
max_weight = in.parse_unsigned();
}
public:
wcnf(opt::context& opt, opt_stream_buffer& in, unsigned_vector& h): opt(opt), m(opt.get_manager()), in(in), m_handles(h) {
opt.set_clausal(true);
}
void parse() {
unsigned num_vars = 0, num_clauses = 0, max_weight = 0;
while (true) {
in.skip_whitespace();
if (in.eof()) {
break;
}
else if (*in == 'c') {
in.skip_line();
}
else if (*in == 'p') {
++in;
parse_spec(num_vars, num_clauses, max_weight);
}
else {
unsigned weight = 0;
app_ref cls = read_clause(weight);
if (weight >= max_weight) {
opt.add_hard_constraint(cls);
}
else {
unsigned id = opt.add_soft_constraint(cls, rational(weight), symbol::null);
if (m_handles.empty()) {
m_handles.push_back(id);
}
}
}
}
}
};
class opb {
opt::context& opt;
ast_manager& m;
opt_stream_buffer& in;
unsigned_vector& m_handles;
arith_util arith;
app_ref parse_id() {
bool negated = in.parse_token("~");
if (!in.parse_token("x")) {
std::cerr << "(error line " << in.line() << " \"unexpected char: " << ((char)in.ch()) << "\" expected \"x\")\n";
exit(3);
}
app_ref p(m);
int id = in.parse_int();
p = m.mk_const(symbol(id), m.mk_bool_sort());
if (negated) p = m.mk_not(p);
in.skip_whitespace();
return p;
}
app_ref parse_ids() {
app_ref result = parse_id();
while (*in == '~' || *in == 'x') {
result = m.mk_and(result, parse_id());
}
return result;
}
rational parse_coeff_r() {
in.skip_whitespace();
svector<char> num;
bool pos = true;
if (*in == '-') pos = false, ++in;
if (*in == '+') ++in;
if (!pos) num.push_back('-');
in.skip_whitespace();
while ('0' <= *in && *in <='9') num.push_back(*in), ++in;
num.push_back(0);
return rational(num.c_ptr());
}
app_ref parse_coeff() {
return app_ref(arith.mk_numeral(parse_coeff_r(), true), m);
}
app_ref parse_term() {
app_ref c = parse_coeff();
app_ref e = parse_ids();
return app_ref(m.mk_ite(e, c, arith.mk_numeral(rational(0), true)), m);
}
void parse_objective(bool is_min) {
app_ref t = parse_term();
while (!in.parse_token(";") && !in.eof()) {
if (is_min) {
t = arith.mk_add(t, parse_term());
}
else {
t = arith.mk_sub(t, parse_term());
}
}
m_handles.push_back(opt.add_objective(t, false));
}
void parse_constraint() {
app_ref t = parse_term();
while (!in.eof()) {
if (in.parse_token(">=")) {
t = arith.mk_ge(t, parse_coeff());
in.parse_token(";");
break;
}
if (in.parse_token("=")) {
t = m.mk_eq(t, parse_coeff());
in.parse_token(";");
break;
}
if (in.parse_token("<=")) {
t = arith.mk_le(t, parse_coeff());
in.parse_token(";");
break;
}
t = arith.mk_add(t, parse_term());
}
opt.add_hard_constraint(t);
}
public:
opb(opt::context& opt, opt_stream_buffer& in, unsigned_vector& h):
opt(opt), m(opt.get_manager()),
in(in), m_handles(h), arith(m) {}
void parse() {
while (true) {
in.skip_whitespace();
if (in.eof()) {
break;
}
else if (*in == '*') {
in.skip_line();
}
else if (in.parse_token("min:")) {
parse_objective(true);
}
else if (in.parse_token("max:")) {
parse_objective(false);
}
else {
parse_constraint();
}
}
}
};
void parse_wcnf(opt::context& opt, std::istream& is, unsigned_vector& h) {
opt_stream_buffer _is(is);
wcnf w(opt, _is, h);
w.parse();
}
void parse_opb(opt::context& opt, std::istream& is, unsigned_vector& h) {
opt_stream_buffer _is(is);
opb opb(opt, _is, h);
opb.parse();
}

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/*++
Copyright (c) 2017 Microsoft Corporation
Module Name:
opt_parse.h
Abstract:
Parse utilities for optimization.
Author:
Nikolaj Bjorner (nbjorner) 2017-11-19
Revision History:
--*/
#ifndef OPT_PARSE_H_
#define OPT_PARSE_H_
void parse_wcnf(opt::context& opt, std::istream& is, unsigned_vector& h);
void parse_opb(opt::context& opt, std::istream& is, unsigned_vector& h);
#endif /* OPT_PARSE_H_ */