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/* Counterexample derivation trees
Copyright (C) 2020-2021 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 <https://www.gnu.org/licenses/>. */
#ifndef DERIVATION_H
# define DERIVATION_H
# include <gl_linked_list.h>
# include <gl_xlist.h>
# include "gram.h"
/* Derivations are trees of symbols such that each nonterminal'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 gl_list_t derivation_list;
typedef struct derivation derivation;
static inline derivation_list derivation_list_new (void)
{
return gl_list_create_empty (GL_LINKED_LIST, NULL, NULL, NULL, true);
}
static inline bool
derivation_list_next (gl_list_iterator_t *it, derivation **d)
{
const void *p = NULL;
bool res = gl_list_iterator_next (it, &p, NULL);
if (res)
*d = (derivation *) p;
else
gl_list_iterator_free (it);
return res;
}
void derivation_list_append (derivation_list dl, derivation *d);
void derivation_list_prepend (derivation_list dl, derivation *d);
void derivation_list_free (derivation_list dl);
derivation *derivation_new (symbol_number sym, derivation_list children);
static inline derivation *derivation_new_leaf (symbol_number sym)
{
return derivation_new (sym, NULL);
}
// Number of symbols.
size_t derivation_size (const derivation *deriv);
void derivation_print (const derivation *deriv, FILE *out, const char *prefix);
void derivation_print_leaves (const derivation *deriv, FILE *out);
void derivation_free (derivation *deriv);
void derivation_retain (derivation *deriv);
// A derivation denoting the position of the dot.
derivation *derivation_dot (void);
#endif /* DERIVATION_H */
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