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87 lines
2.3 KiB
87 lines
2.3 KiB
8 years ago
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/*
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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 struct te_expr {
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int type;
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union {double value; const double *bound; const void *function;};
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void *parameters[1];
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} te_expr;
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enum {
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TE_VARIABLE = 0,
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TE_FUNCTION0 = 8, TE_FUNCTION1, TE_FUNCTION2, TE_FUNCTION3,
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TE_FUNCTION4, TE_FUNCTION5, TE_FUNCTION6, TE_FUNCTION7,
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TE_CLOSURE0 = 16, TE_CLOSURE1, TE_CLOSURE2, TE_CLOSURE3,
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TE_CLOSURE4, TE_CLOSURE5, TE_CLOSURE6, TE_CLOSURE7,
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TE_FLAG_PURE = 32
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};
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typedef struct te_variable {
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const char *name;
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const void *address;
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int type;
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void *context;
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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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