airlang 0.26.0

Air is a minimalist and universal programming language.
Documentation 
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

use std::cell::BorrowError;
use std::cell::BorrowMutError;
use std::cell::Ref;
use std::cell::RefCell;
use std::cell::RefMut;
use std::hash::Hash;
use std::hash::Hasher;
use std::rc::Rc;

use derive_more::From;

use crate::semantics::val::Val;

#[derive(Clone, From)]
pub struct LinkVal {
    cell: Rc<RefCell<Val>>,
    const_: bool,
}

impl LinkVal {
    pub fn new(val: Val, const_: bool) -> Self {
        Self { cell: Rc::new(RefCell::new(val)), const_ }
    }

    pub fn is_const(&self) -> bool {
        self.const_
    }

    pub(crate) fn ptr_addr(&self) -> usize {
        Rc::as_ptr(&self.cell).addr()
    }

    pub fn try_borrow(&self) -> Result<Ref<'_, Val>, BorrowError> {
        self.cell.try_borrow()
    }

    pub fn try_borrow_mut(&self) -> Result<RefMut<'_, Val>, BorrowMutError> {
        self.cell.try_borrow_mut()
    }
}

impl PartialEq for LinkVal {
    fn eq(&self, other: &LinkVal) -> bool {
        Rc::ptr_eq(&self.cell, &other.cell) && self.const_ == other.const_
    }
}

impl Eq for LinkVal {}

impl Hash for LinkVal {
    fn hash<H: Hasher>(&self, state: &mut H) {
        Rc::as_ptr(&self.cell).addr().hash(state);
        self.const_.hash(state);
    }
}