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/* Copyright (C) 2006, 2007 William McCune
This file is part of the LADR Deduction Library.
The LADR Deduction Library is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License,
version 2.
The LADR Deduction Library 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 the LADR Deduction Library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "../ladr/top_input.h"
#include "../ladr/dollar.h"
#define PROGRAM_NAME "rewriter"
#include "../VERSION_DATE.h"
static char Help_string[] =
"\nThis program takes a file of rewrite rules (arg 1) and a\n"
"stream of terms (stdin). Rewritten terms are sent to stdout.\n"
"The rewrite rules are not checked for termination.\n"
"For example,\n\n"
" rewriter demods < terms.in > terms.out\n\n"
"The file of demodulators contains optional commands\n"
"then a list of demodulators. The commands can be used to\n"
"declare infix operations.\n"
"Example file of rewrite rules:\n\n"
" op(400, infix, ^).\n"
" op(400, infix, v).\n"
" formulas(demodulators).\n"
" end_of_list.\n\n";
int main(int argc, char **argv)
{
FILE *head_fp;
Plist rules, p;
Term t;
BOOL verbose = string_member("verbose", argv, argc);;
if (string_member("help", argv, argc) ||
string_member("-help", argv, argc) ||
argc < 2) {
printf("\n%s, version %s, %s\n",PROGRAM_NAME,PROGRAM_VERSION,PROGRAM_DATE);
printf("%s", Help_string);
exit(1);
}
init_standard_ladr();
init_dollar_eval();
head_fp = fopen(argv[1], "r");
if (head_fp == NULL)
fatal_error("rewrite rule file can't be opened for reading");
t = read_commands(head_fp, stderr, verbose, KILL_UNKNOWN);
if (!is_term(t, "list", 1))
fatal_error("list(rewrite_rules) not found");
/* Read list of rules. */
rules = read_term_list(head_fp, stderr);
fclose(head_fp);
for (p = rules; p != NULL; p = p->next) {
Term rule = p->v;
if (is_term(rule, "=", 2) ||
is_term(rule, "<->", 2) ||
(is_term(rule, "->", 2) && is_term(ARG(rule,1), "=", 2))) {
term_set_variables(rule, MAX_VARS);
}
else {
fprintf(stdout, "bad rewrite rule: "); fwrite_term_nl(stdout, rule);
fprintf(stderr, "bad rewrite rule: "); fwrite_term_nl(stderr, rule);
fatal_error("bad rewrite fule");
}
}
if (verbose)
fwrite_term_list(stdout, rules, "rewrite_rules");
/* Read and demodulate terms. */
t = read_term(stdin, stderr);
while (t != NULL) {
if (verbose) {
fprintf(stdout, "\nBefore: "); fwrite_term_nl(stdout, t);
}
t = programmed_rewrite(t, rules);
if (verbose)
fprintf(stdout, "After: ");
fwrite_term_nl(stdout, t);
fflush(stdout);
zap_term(t);
t = read_term(stdin, stderr);
}
exit(0);
} /* main */
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