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https://github.com/eledio-devices/thirdparty-tinyexpr.git
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75 lines
2.2 KiB
C
75 lines
2.2 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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typedef double (*te_fun1)(double);
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typedef double (*te_fun2)(double, double);
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typedef struct te_expr {
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struct te_expr *left, *right;
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union {double value; te_fun1 f1; te_fun2 f2;};
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const double *bound;
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} te_expr;
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typedef struct {
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const char *name;
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const double *value;
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} te_variable;
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/* Note on error handling:
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* If the parser encounters an error, it will still return
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* an expression up to that point (which may be worthless or useful.
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* If the error pointer parameter is passed in and not null, the
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* parser will set it to roughly the index of the error in the
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* input expression. If there is no error, the parse sets
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* the error pointer to 0.
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*/
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/* Parses the input expression, evaluates it, and frees it. */
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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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te_expr *te_compile(const char *expression, const te_variable *lookup, int lookup_len, 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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void te_free(te_expr *n);
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#endif /*__TINYEXPR_H__*/
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