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#include "variables.h"
#include "../lib/avl_tree/avl_tree.h"
#include "../lib/cstr/cstr.h"
#include "../lib/malloc/malloc.h"
typedef struct {
const char *name;
const char *value;
} variable_pair_t;
i8 __variable_pair_compare(void *a, void *b);
avl_tree_t *variable_tree;
/** DOC
* @type function
* @name __variable_pair_compare
*
* @param void *a
* @param void *b
* @return u8
*
* @description
* Compair function for `variable_pair_t`.
*/
i8 __variable_pair_compare(void *a, void *b)
{
variable_pair_t *va = (variable_pair_t*)a;
variable_pair_t *vb = (variable_pair_t*)b;
return cstr_compare(va->name, vb->name);
}
/** DOC
* @type function
* @name init_variables
*
* @description
* Initializes the variable binary tree.
*/
void init_variables()
{
variable_tree = new_avl_tree(__variable_pair_compare, 1);
}
/** DOC
* @type function
* @name set_variable
*
* @param const char *name
* @param const char *value
*
* @description
* Sets a variable.
*/
void set_variable(const char *name, const char *value)
{
variable_pair_t *pair = malloc(sizeof(variable_pair_t));
pair->name = name;
pair->value = value;
avl_tree_insert(variable_tree, pair);
}
/** DOC
* @type function
* @name get_variable
*
* @param const char *name
*
* @description
* Gets a variable.
*/
const char *get_variable(const char *name)
{
variable_pair_t query = { .name = name, .value = 0 };
variable_pair_t *res = avl_tree_search(variable_tree, &query);
if (res)
return res->value;
return 0;
}
#ifdef VARIABLES_UNIT_TEST
#include "../lib/sys/write.h"
void test_get(const char *name)
{
const char *value = get_variable(name);
if (value)
write(0, value, cstr_length(value));
else
write(0, "value = nullptr", 15);
write(0, "\n", 1);
}
int main()
{
init_variables();
set_variable("name", "john");
set_variable("user", "n8");
test_get("name");
test_get("user");
set_variable("user", "freak");
test_get("user");
}
#endif
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