90 lines
3.2 KiB
C
90 lines
3.2 KiB
C
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/****************************************************************************************[Dimacs.h]
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Copyright (c) 2003-2006, Niklas Een, Niklas Sorensson
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Copyright (c) 2007-2010, Niklas Sorensson
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
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associated documentation files (the "Software"), to deal in the Software without restriction,
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including without limitation the rights to use, copy, modify, merge, publish, distribute,
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sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or
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substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
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NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
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OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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**************************************************************************************************/
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#ifndef Glucose_Dimacs_h
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#define Glucose_Dimacs_h
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#include <stdio.h>
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#include "utils/ParseUtils.h"
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#include "core/SolverTypes.h"
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namespace Glucose {
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//=================================================================================================
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// DIMACS Parser:
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template<class B, class Solver>
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static void readClause(B& in, Solver& S, vec<Lit>& lits) {
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int parsed_lit, var;
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lits.clear();
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for (;;){
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parsed_lit = parseInt(in);
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if (parsed_lit == 0) break;
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var = abs(parsed_lit)-1;
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while (var >= S.nVars()) S.newVar();
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lits.push( (parsed_lit > 0) ? mkLit(var) : ~mkLit(var) );
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}
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}
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template<class B, class Solver>
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static void parse_DIMACS_main(B& in, Solver& S) {
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vec<Lit> lits;
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int vars = 0;
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int clauses = 0;
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int cnt = 0;
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for (;;){
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skipWhitespace(in);
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if (*in == EOF) break;
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else if (*in == 'p'){
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if (eagerMatch(in, "p cnf")){
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vars = parseInt(in);
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clauses = parseInt(in);
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// SATRACE'06 hack
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// if (clauses > 4000000)
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// S.eliminate(true);
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}else{
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printf("PARSE ERROR! Unexpected char: %c\n", *in), exit(3);
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}
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} else if (*in == 'c' || *in == 'p')
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skipLine(in);
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else{
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cnt++;
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readClause(in, S, lits);
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S.addClause_(lits); }
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}
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if (vars != S.nVars())
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fprintf(stderr, "WARNING! DIMACS header mismatch: wrong number of variables.\n");
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if (cnt != clauses)
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fprintf(stderr, "WARNING! DIMACS header mismatch: wrong number of clauses.\n");
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}
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// Inserts problem into solver.
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//
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template<class Solver>
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static void parse_DIMACS(gzFile input_stream, Solver& S) {
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StreamBuffer in(input_stream);
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parse_DIMACS_main(in, S); }
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//=================================================================================================
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}
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#endif
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