mirror of
https://github.com/eledio-devices/thirdparty-tinyexpr.git
synced 2025-10-31 00:32:38 +01:00
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
// SPDX-License-Identifier: Zlib
|
|
/*
|
|
* TINYEXPR - Tiny recursive descent parser and evaluation engine in C
|
|
*
|
|
* Copyright (c) 2015-2020 Lewis Van Winkle
|
|
*
|
|
* http://CodePlea.com
|
|
*
|
|
* This software is provided 'as-is', without any express or implied
|
|
* warranty. In no event will the authors be held liable for any damages
|
|
* arising from the use of this software.
|
|
*
|
|
* Permission is granted to anyone to use this software for any purpose,
|
|
* including commercial applications, and to alter it and redistribute it
|
|
* freely, subject to the following restrictions:
|
|
*
|
|
* 1. The origin of this software must not be misrepresented; you must not
|
|
* claim that you wrote the original software. If you use this software
|
|
* in a product, an acknowledgement in the product documentation would be
|
|
* appreciated but is not required.
|
|
* 2. Altered source versions must be plainly marked as such, and must not be
|
|
* misrepresented as being the original software.
|
|
* 3. This notice may not be removed or altered from any source distribution.
|
|
*/
|
|
|
|
#ifndef TINYEXPR_H
|
|
#define TINYEXPR_H
|
|
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
|
|
|
|
typedef struct te_expr {
|
|
int type;
|
|
union {double value; const double *bound; const void *function;};
|
|
void *parameters[1];
|
|
} te_expr;
|
|
|
|
|
|
enum {
|
|
TE_VARIABLE = 0,
|
|
|
|
TE_FUNCTION0 = 8, TE_FUNCTION1, TE_FUNCTION2, TE_FUNCTION3,
|
|
TE_FUNCTION4, TE_FUNCTION5, TE_FUNCTION6, TE_FUNCTION7,
|
|
|
|
TE_CLOSURE0 = 16, TE_CLOSURE1, TE_CLOSURE2, TE_CLOSURE3,
|
|
TE_CLOSURE4, TE_CLOSURE5, TE_CLOSURE6, TE_CLOSURE7,
|
|
|
|
TE_FLAG_PURE = 32
|
|
};
|
|
|
|
typedef struct te_variable {
|
|
const char *name;
|
|
const void *address;
|
|
int type;
|
|
void *context;
|
|
} te_variable;
|
|
|
|
|
|
|
|
/* Parses the input expression, evaluates it, and frees it. */
|
|
/* Returns NaN on error. */
|
|
double te_interp(const char *expression, int *error);
|
|
|
|
/* Parses the input expression and binds variables. */
|
|
/* Returns NULL on error. */
|
|
te_expr *te_compile(const char *expression, const te_variable *variables, int var_count, int *error);
|
|
|
|
/* Evaluates the expression. */
|
|
double te_eval(const te_expr *n);
|
|
|
|
/* Prints debugging information on the syntax tree. */
|
|
void te_print(const te_expr *n);
|
|
|
|
/* Frees the expression. */
|
|
/* This is safe to call on NULL pointers. */
|
|
void te_free(te_expr *n);
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /*TINYEXPR_H*/
|