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83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/**
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* @file variable.h
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* Defines variable data structure, and provides functions for variable
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* creation.
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*
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* Copyright (C) 2018 Clyne Sullivan
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef VARIABLE_H_
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#define VARIABLE_H_
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#include <stdint.h>
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/**
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* Data for a script variable.
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*/
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typedef struct {
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uint8_t tmp :1; /**< If zero, variable cannot be free'd */
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uint8_t type :3; /**< The variable's type */
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uint8_t unused :4; /**< Unused... */
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uint8_t array; /**< ">0?" -> array w/ this size */
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union {
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float f;
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uint32_t p;
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} value; /**< The variable's value, either float or a pointer */
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} variable;
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/**
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* Defines possible variable types.
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*/
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enum VARTYPE {
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NUMBER = 0, /**< Number/float */
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STRING, /**< String of text */
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OPERATOR, /**< Arithmetical operation */
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FUNC, /**< In-script function */
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CFUNC, /**< C function */
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};
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/**
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* Makes a number out of the given variable.
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* @param v the variable to use, if zero one is malloc'd
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* @param f the number to assign the variable
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* @return the new float variable
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*/
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variable *make_varf(variable *v, float f);
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/**
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* Makes a string out of the given variable.
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* @param v the variable to use, if zero one is malloc'd
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* @param f the string to assign the variable
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* @return the new string variable
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*/
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variable *make_vars(variable *v, const char *s);
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/**
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* Creates a temporary number variable out of the given text.
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* @param text the string to convert to a number
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* @return a number variable with the converted value
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*/
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variable *make_num(const char *text);
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/**
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* Clones a variable into a new, malloc'd variable.
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* @param n the variable to clone
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* @return the cloned, malloc'd variable
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*/
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variable *varclone(variable *n);
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#endif // VARIABLE_H_
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