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/*
* Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2011, 2012,
* 2013 Free Software Foundation, Inc.
*
* This file is part of GNU libmatheval
*
* GNU libmatheval 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.
*
* GNU libmatheval 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 GNU libmatheval. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <libguile.h>
#include <matheval.h>
#include "config.h"
static scm_t_bits evaluator_tag; /* Unique identifier for Guile
* objects of evaluator type. */
/* Guile interface for libmatheval library. Procedures below are simple
* wrappers for corresponding libmatheval procedures. */
static size_t evaluator_destroy_scm(SCM evaluator_smob);
static SCM evaluator_create_scm(SCM string);
static SCM evaluator_evaluate_scm(SCM evaluator_smob, SCM count,
SCM names, SCM values);
static SCM evaluator_get_string_scm(SCM evaluator_smob);
static SCM evaluator_get_variables_scm(SCM evaluator_smob);
static SCM evaluator_derivative_scm(SCM evaluator_smob, SCM name);
static SCM evaluator_evaluate_x_scm(SCM evaluator_smob, SCM x);
static SCM evaluator_evaluate_x_y_scm(SCM evaluator_smob, SCM x,
SCM y);
static SCM evaluator_evaluate_x_y_z_scm(SCM evaluator_smob, SCM x,
SCM y, SCM z);
static SCM evaluator_derivative_x_scm(SCM evaluator_smob);
static SCM evaluator_derivative_y_scm(SCM evaluator_smob);
static SCM evaluator_derivative_z_scm(SCM evaluator_smob);
static void
inner_main(void *closure, int argc, char **argv)
{
/* Extend Guile with evaluator type and register procedure to free
* objects of this type. */
evaluator_tag = scm_make_smob_type("evaluator", sizeof(void *));
scm_set_smob_free(evaluator_tag, evaluator_destroy_scm);
/* Register other procedures working on evaluator type. */
scm_c_define_gsubr("evaluator-create", 1, 0, 0,
(SCM(*)())evaluator_create_scm);
scm_c_define_gsubr("evaluator-evaluate", 4, 0, 0,
(SCM(*)())evaluator_evaluate_scm);
scm_c_define_gsubr("evaluator-get-string", 1, 0, 0,
(SCM(*)())evaluator_get_string_scm);
scm_c_define_gsubr("evaluator-get-variables", 1, 0, 0,
(SCM(*)())evaluator_get_variables_scm);
scm_c_define_gsubr("evaluator-derivative", 2, 0, 0,
(SCM(*)())evaluator_derivative_scm);
scm_c_define_gsubr("evaluator-evaluate-x", 2, 0, 0,
(SCM(*)())evaluator_evaluate_x_scm);
scm_c_define_gsubr("evaluator-evaluate-x-y", 3, 0, 0,
(SCM(*)())evaluator_evaluate_x_y_scm);
scm_c_define_gsubr("evaluator-evaluate-x-y-z", 4, 0, 0,
(SCM(*)())evaluator_evaluate_x_y_z_scm);
scm_c_define_gsubr("evaluator-derivative-x", 1, 0, 0,
(SCM(*)())evaluator_derivative_x_scm);
scm_c_define_gsubr("evaluator-derivative-y", 1, 0, 0,
(SCM(*)())evaluator_derivative_y_scm);
scm_c_define_gsubr("evaluator-derivative-z", 1, 0, 0,
(SCM(*)())evaluator_derivative_z_scm);
/* Check is there exactly one argument left in command line. */
assert(argc == 2);
/* Interpret Guile code from file with name given through above
* argument. */
scm_primitive_load(scm_from_locale_string(argv[1]));
}
/* Program is demonstrating use of libmatheval library of procedures for
* evaluating mathematical functions. Program expects single argument
* from command line and interpret Guile code (extended with procedures
* from libmatheval Guile interface) from this file. */
int
main(int argc, char **argv)
{
/* Initialize Guile library; inner_main() procedure gets called in
* turn. */
scm_boot_guile(argc, argv, inner_main, 0);
exit(EXIT_SUCCESS);
}
/* Wrapper for evaluator_destroy() procedure from libmatheval library. */
static size_t
evaluator_destroy_scm(SCM evaluator_smob)
{
SCM_ASSERT((SCM_NIMP(evaluator_smob)
&& SCM_SMOB_PREDICATE(evaluator_tag, evaluator_smob)),
evaluator_smob, SCM_ARG1, "evaluator-destroy");
evaluator_destroy((void *) SCM_CDR(evaluator_smob));
return sizeof(void *);
}
/* Wrapper for evaluator_create() procedure from libmatheval library. */
static SCM
evaluator_create_scm(SCM string)
{
char *stringz;
void *evaluator;
SCM_ASSERT(SCM_NIMP(string) &&
scm_is_string(string), string, SCM_ARG1,
"evaluator-create");
stringz = scm_to_locale_string(string);
evaluator = evaluator_create(stringz);
free(stringz);
SCM_RETURN_NEWSMOB(evaluator_tag, evaluator);
}
/* Wrapper for evaluator_evaluate() procedure from libmatheval library.
* Variable names and values are passed as lists from Guile, so copies of
* these argument have to be created in order to be able to call
* evaluator_evaluate() procedure. */
static SCM
evaluator_evaluate_scm(SCM evaluator_smob, SCM count, SCM names,
SCM values)
{
SCM name;
char **names_copy;
SCM value;
double *values_copy;
double result;
int i;
SCM_ASSERT((SCM_NIMP(evaluator_smob)
&& SCM_SMOB_PREDICATE(evaluator_tag, evaluator_smob)),
evaluator_smob, SCM_ARG1, "evaluator-evaluate");
SCM_ASSERT(scm_is_integer(count), count, SCM_ARG2,
"evaluator-evaluate");
names_copy = (char **) malloc(scm_to_int(count) * sizeof(char *));
for (i = 0, name = names; i < scm_to_int(count);
i++, name = SCM_CDR(name)) {
SCM_ASSERT(SCM_NIMP(name) && SCM_CONSP(name)
&& scm_is_string(SCM_CAR(name)), names, SCM_ARG3,
"evaluator-evaluate");
names_copy[i] = scm_to_locale_string(SCM_CAR(name));
}
values_copy = (double *) malloc(scm_to_int(count) * sizeof(double));
for (i = 0, value = values; i < scm_to_int(count);
i++, value = SCM_CDR(value)) {
SCM_ASSERT(SCM_NIMP(value) && SCM_CONSP(value)
&& SCM_NUMBERP(SCM_CAR(value)), values,
SCM_ARG4, "evaluator-evaluate");
values_copy[i] =
scm_to_double(SCM_CAR(value));
}
result =
evaluator_evaluate((void *) SCM_CDR(evaluator_smob),
scm_to_int(count), names_copy, values_copy);
for (i = 0; i < scm_to_int(count); i++)
free(names_copy[i]);
free(names_copy);
free(values_copy);
return scm_from_double(result);
}
/* Wrapper for evaluator_get_string() procedure from libmatheval library. */
static SCM
evaluator_get_string_scm(SCM evaluator_smob)
{
SCM_ASSERT((SCM_NIMP(evaluator_smob)
&& SCM_SMOB_PREDICATE(evaluator_tag, evaluator_smob)),
evaluator_smob, SCM_ARG1, "evaluator-get-string");
return
scm_from_locale_string(evaluator_get_string
((void *) SCM_CDR(evaluator_smob)));
}
/* Wrapper for evaluator_get_variables() procedure from libmatheval
* library. */
static SCM
evaluator_get_variables_scm(SCM evaluator_smob)
{
char **names;
int count;
SCM list;
int i;
SCM_ASSERT((SCM_NIMP(evaluator_smob)
&& SCM_SMOB_PREDICATE(evaluator_tag, evaluator_smob)),
evaluator_smob, SCM_ARG1, "evaluator-get-string");
evaluator_get_variables((void *) SCM_CDR(evaluator_smob), &names,
&count);
list = SCM_EOL;
for (i = 0; i < count; i++)
list =
scm_append_x(scm_list_n
(list,
scm_list_n(scm_from_locale_string(names[i]),
SCM_UNDEFINED),
SCM_UNDEFINED));
return list;
}
/* Wrapper for evaluator_derivative() procedure from libmatheval library. */
static SCM
evaluator_derivative_scm(SCM evaluator_smob, SCM name)
{
char * stringz;
SCM_ASSERT((SCM_NIMP(evaluator_smob)
&& SCM_SMOB_PREDICATE(evaluator_tag, evaluator_smob)),
evaluator_smob, SCM_ARG1, "evaluator-derivative");
SCM_ASSERT(SCM_NIMP(name)
&& scm_is_string(name), name, SCM_ARG2,
"evaluator-derivative");
stringz = scm_to_locale_string(name);
SCM_RETURN_NEWSMOB(evaluator_tag,
evaluator_derivative((void *)
SCM_CDR(evaluator_smob),
stringz));
free(stringz);
}
/* Wrapper for evaluator_evaluate_x() procedure from libmatheval library. */
static SCM
evaluator_evaluate_x_scm(SCM evaluator_smob, SCM x)
{
SCM_ASSERT((SCM_NIMP(evaluator_smob)
&& SCM_SMOB_PREDICATE(evaluator_tag, evaluator_smob)),
evaluator_smob, SCM_ARG1, "evaluator-evaluate-x");
SCM_ASSERT(SCM_NUMBERP(x), x, SCM_ARG2, "evaluator-evaluate-x");
return
scm_from_double(evaluator_evaluate_x
((void *) SCM_CDR(evaluator_smob),
scm_to_double(x)));
}
/* Wrapper for evaluator_evaluate_x_y() procedure from libmatheval
* library. */
static SCM
evaluator_evaluate_x_y_scm(SCM evaluator_smob, SCM x, SCM y)
{
SCM_ASSERT((SCM_NIMP(evaluator_smob)
&& SCM_SMOB_PREDICATE(evaluator_tag, evaluator_smob)),
evaluator_smob, SCM_ARG1, "evaluator-evaluate-x-y");
SCM_ASSERT(SCM_NUMBERP(x), x, SCM_ARG2, "evaluator-evaluate-x-y");
SCM_ASSERT(SCM_NUMBERP(y), y, SCM_ARG3, "evaluator-evaluate-x-y");
return
scm_from_double(evaluator_evaluate_x_y
((void *) SCM_CDR(evaluator_smob),
scm_to_double(x),
scm_to_double(y)));
}
/* Wrapper for evaluator_evaluate_x_y_z() procedure from libmatheval
* library. */
static SCM
evaluator_evaluate_x_y_z_scm(SCM evaluator_smob, SCM x, SCM y, SCM z)
{
SCM_ASSERT((SCM_NIMP(evaluator_smob)
&& SCM_SMOB_PREDICATE(evaluator_tag, evaluator_smob)),
evaluator_smob, SCM_ARG1, "evaluator-evaluate-x-y-z");
SCM_ASSERT(SCM_NUMBERP(x), x, SCM_ARG2,
"evaluator-evaluate-x-y-z");
SCM_ASSERT(SCM_NUMBERP(y), y, SCM_ARG3,
"evaluator-evaluate-x-y-z");
SCM_ASSERT(SCM_NUMBERP(z), z, SCM_ARG4,
"evaluator-evaluate-x-y-z");
return
scm_from_double(evaluator_evaluate_x_y_z
((void *) SCM_CDR(evaluator_smob),
scm_to_double(x),
scm_to_double(y),
scm_to_double(z)));
}
/* Wrapper for evaluator_derivative_x() procedure from libmatheval
* library. */
static SCM
evaluator_derivative_x_scm(SCM evaluator_smob)
{
SCM_ASSERT((SCM_NIMP(evaluator_smob)
&& SCM_SMOB_PREDICATE(evaluator_tag, evaluator_smob)),
evaluator_smob, SCM_ARG1, "evaluator-derivative-x");
SCM_RETURN_NEWSMOB(evaluator_tag,
evaluator_derivative((void *)
SCM_CDR(evaluator_smob),
"x"));
}
/* Wrapper for evaluator_derivative_y() procedure from libmatheval
* library. */
static SCM
evaluator_derivative_y_scm(SCM evaluator_smob)
{
SCM_ASSERT((SCM_NIMP(evaluator_smob)
&& SCM_SMOB_PREDICATE(evaluator_tag, evaluator_smob)),
evaluator_smob, SCM_ARG1, "evaluator-derivative-y");
SCM_RETURN_NEWSMOB(evaluator_tag,
evaluator_derivative((void *)
SCM_CDR(evaluator_smob),
"y"));
}
/* Wrapper for evaluator_derivative_z() procedure from libmatheval
* library. */
static SCM
evaluator_derivative_z_scm(SCM evaluator_smob)
{
SCM_ASSERT((SCM_NIMP(evaluator_smob)
&& SCM_SMOB_PREDICATE(evaluator_tag, evaluator_smob)),
evaluator_smob, SCM_ARG1, "evaluator-derivative-z");
SCM_RETURN_NEWSMOB(evaluator_tag,
evaluator_derivative((void *)
SCM_CDR(evaluator_smob),
"z"));
}
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