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/* Counterexample derivation trees
Copyright (C) 2020 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef DERIVATION_H
# define DERIVATION_H
# include <gl_list.h>
# include "gram.h"
/* Derivations are trees of symbols such that each non terminal's
children are symbols that produce that nonterminal if they are
relevant to the counterexample. The leaves of a derivation form a
counterexample when printed. */
typedef struct derivation
{
symbol_number sym;
gl_list_t children;
} derivation;
derivation *derivation_new (symbol_number sym, gl_list_t children);
size_t derivation_size (const derivation *deriv);
void derivation_print (const derivation *deriv, FILE *f);
void derivation_print_leaves (const derivation *deriv, FILE *f);
void derivation_free (derivation *deriv);
const derivation *derivation_dot (void);
#endif /* DERIVATION_H */
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