mirror of
https://github.com/eledio-devices/thirdparty-tinyexpr.git
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93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/*
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* TINYEXPR - Tiny recursive descent parser and evaluation engine in C
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*
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* Copyright (c) 2015, 2016 Lewis Van Winkle
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*
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* http://CodePlea.com
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgement in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef __TINYEXPR_H__
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#define __TINYEXPR_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef double (*te_fun0)(void);
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typedef double (*te_fun1)(double);
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typedef double (*te_fun2)(double, double);
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typedef double (*te_fun3)(double, double, double);
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typedef double (*te_fun4)(double, double, double, double);
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typedef double (*te_fun5)(double, double, double, double, double);
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typedef double (*te_fun6)(double, double, double, double, double, double);
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typedef double (*te_fun7)(double, double, double, double, double, double, double);
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typedef union
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{
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te_fun0 f0; te_fun1 f1; te_fun2 f2; te_fun3 f3; te_fun4 f4; te_fun5 f5; te_fun6 f6; te_fun7 f7;
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} te_fun;
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typedef struct te_expr {
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int type;
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union {double value; const double *bound; te_fun fun; };
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int member_count;
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struct te_expr *members[];
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} te_expr;
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#define TE_MASK_ARIT 0x00000007 /* Three bits, Arity, max is 8 */
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#define TE_FLAG_TYPE 0x00000018 /* Two bits, 1 = constant, 2 = variable, 3 = function */
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enum { TE_CONST = 1 << 3, TE_VAR = 2 << 3, TE_FUN = 3 << 3};
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typedef struct te_variable {
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const char *name;
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const void *value;
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int type;
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} te_variable;
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/* Parses the input expression, evaluates it, and frees it. */
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/* Returns NaN on error. */
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double te_interp(const char *expression, int *error);
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/* Parses the input expression and binds variables. */
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/* Returns NULL on error. */
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te_expr *te_compile(const char *expression, const te_variable *variables, int var_count, int *error);
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/* Evaluates the expression. */
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double te_eval(const te_expr *n);
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/* Prints debugging information on the syntax tree. */
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void te_print(const te_expr *n);
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/* Frees the expression. */
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/* This is safe to call on NULL pointers. */
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void te_free(te_expr *n);
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#ifdef __cplusplus
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}
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#endif
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#endif /*__TINYEXPR_H__*/
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