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98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
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// SPDX-License-Identifier: Zlib
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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) 2015-2020 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 {
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double value;
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const double* bound;
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const void* function;
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};
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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,
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TE_FUNCTION1,
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TE_FUNCTION2,
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TE_FUNCTION3,
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TE_FUNCTION4,
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TE_FUNCTION5,
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TE_FUNCTION6,
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TE_FUNCTION7,
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TE_CLOSURE0 = 16,
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TE_CLOSURE1,
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TE_CLOSURE2,
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TE_CLOSURE3,
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TE_CLOSURE4,
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TE_CLOSURE5,
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TE_CLOSURE6,
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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*
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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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