1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83

use crate::ffi::{self, FromFfi, ToFfi};

pub trait VariableType {
    fn get(name: &str) -> Self;
    fn set(&self, name: &str);
}

pub enum Persistence {
    Session,
    Permanent,
}

macro_rules! impl_variable_type {
    ($type:ty, $get:ident, $set:ident) => {
        impl VariableType for $type {
            fn get(name: &str) -> Self {
                unsafe { ffi::$get(name.to_ffi()) as _ }
            }

            fn set(&self, name: &str) {
                unsafe { ffi::$set(name.to_ffi(), *self as _) }
            }
        }
    };
}

impl_variable_type!(i8, get_variable_i64, set_variable_i64);
impl_variable_type!(i16, get_variable_i64, set_variable_i64);
impl_variable_type!(i32, get_variable_i64, set_variable_i64);
impl_variable_type!(i64, get_variable_i64, set_variable_i64);

impl_variable_type!(u8, get_variable_i64, set_variable_i64);
impl_variable_type!(u16, get_variable_i64, set_variable_i64);
impl_variable_type!(u32, get_variable_i64, set_variable_i64);
impl_variable_type!(u64, get_variable_i64, set_variable_i64);

impl_variable_type!(f32, get_variable_f64, set_variable_f64);
impl_variable_type!(f64, get_variable_f64, set_variable_f64);

impl VariableType for bool {
    fn get(name: &str) -> Self {
        unsafe { ffi::get_variable_bool(name.to_ffi()) }
    }

    fn set(&self, name: &str) {
        unsafe { ffi::set_variable_bool(name.to_ffi(), *self) }
    }
}

impl VariableType for String {
    fn get(name: &str) -> Self {
        let ptr = unsafe { ffi::get_variable_str(name.to_ffi()) };
        String::from_ffi(ptr)
    }

    fn set(&self, name: &str) {
        unsafe { ffi::set_variable_str(name.to_ffi(), self.to_ffi()) }
    }
}

pub struct Variable<T> {
    name: String,
    _phantom: std::marker::PhantomData<T>,
}

impl<T> Variable<T> {
    pub fn new(name: &str) -> Self {
        Self {
            name: name.to_string(),
            _phantom: std::marker::PhantomData,
        }
    }
}

impl<T: VariableType> Variable<T> {
    pub fn get(&self) -> T {
        T::get(&self.name)
    }

    pub fn set(&self, value: &T) {
        value.set(&self.name);
    }
}