/*
4coder_variables.h - Variables system
*/

// TOP

#if !defined(FCODER_VARIABLES_H)
#define FCODER_VARIABLES_H

////////////////////////////////
// NOTE(allen): Types

typedef u64 String_ID;

struct Variable{
    Variable *next;
    String_ID key;
    String_ID string;
    Variable *first;
    Variable *last;
};

struct Variable_Handle{
    Variable *ptr;
};

////////////////////////////////
// NOTE(allen): Functions

function String_ID       vars_save_string(String_Const_u8 string);
#define vars_save_string_lit(S) vars_save_string(string_u8_litexpr(S))
function String_Const_u8 vars_read_string(Arena *arena, String_ID id);

function Variable_Handle vars_get_root(void);
function Variable_Handle vars_get_nil(void);
function b32             vars_is_nil(Variable_Handle var);
function b32             vars_match(Variable_Handle a, Variable_Handle b);

function Variable_Handle vars_read_key(Variable_Handle var, String_ID key);
function String_ID       vars_string_id_from_var(Variable_Handle var);
function String_Const_u8 vars_string_from_var(Arena *arena, Variable_Handle var);

function void            vars_set_string(Variable_Handle var, String_ID string);
function void            vars_erase(Variable_Handle var, String_ID key);
function Variable_Handle vars_new_variable(Variable_Handle var, String_ID key);
function Variable_Handle vars_new_variable(Variable_Handle var, String_ID key, String_ID string);
function void            vars_clear_keys(Variable_Handle var);

#endif //4CODER_VARIABLES_H

// BOTTOM