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