formula-calc.h

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// Simple mathematical formula processing library
//  Written by Atsushi Watanabe
//  Intelligent Robot Laboratory, University of Tsukuba
//
// Copyright 2011 Atsushi Watanabe, All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice, this
//   list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef FORMULA_CALC_H
#define FORMULA_CALC_H

#ifdef __cplusplus
// clang-format off
extern "C"
{
// clang-format on
#endif  // __cplusplus

#include <stdio.h>

enum rpf_type_t
{
  TYPE_VALUE,
  TYPE_MATH,
  TYPE_VARIABLE,
  TYPE_OP,
  TYPE_MAX,
  TYPE_RPF,
  TYPE_START
};

struct rpf_t
{
  enum rpf_type_t type;
  void *value;
  struct rpf_t *next;
};

struct variables_t
{
  const char *name;
  double *pointer;
};

int formula(const char *expr, struct rpf_t **rpf, const struct variables_t *variable);
void formula_free(struct rpf_t *rpf);
double formula_eval(struct rpf_t *rpf);
struct rpf_t *formula_optimize(struct rpf_t *rpf);
void formula_print(FILE *stream, struct rpf_t *rpf);

#ifdef __cplusplus
}
#endif  // __cplusplus
#endif  // FORMULA_CALC_H