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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
#[cfg(feature = "compile-with-external-structures")]
pub(crate) mod external {
use crate::Loc;
/// C-compatible Option<Loc>
#[repr(C)]
#[derive(PartialEq)]
pub enum MaybeLoc {
/// Equivalent of Option::Some
Some(Loc),
/// Equivalent of Option::None
None,
}
impl std::fmt::Debug for MaybeLoc {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
std::fmt::Debug::fmt(&self.as_ref(), f)
}
}
impl Clone for MaybeLoc {
fn clone(&self) -> Self {
match self.as_ref() {
Some(loc) => Self::Some(loc.clone()),
None => Self::None,
}
}
}
impl MaybeLoc {
/// Equivalent of Option::or_else
pub fn or_else<F>(self, f: F) -> Self
where
F: FnOnce() -> Self,
{
if self.is_none() {
f()
} else {
self
}
}
/// Equivalent of Option::unwrap
pub fn unwrap(self) -> Loc {
match self {
MaybeLoc::Some(loc) => loc,
MaybeLoc::None => panic!("failed to unwrap MaybeLoc::None"),
}
}
/// Equivalent of Option::unwrap_or_else
pub fn unwrap_or_else<F>(self, f: F) -> Loc
where
F: FnOnce() -> Loc,
{
match self {
MaybeLoc::Some(loc) => loc,
MaybeLoc::None => f(),
}
}
/// Equivalent of Option::expect
pub fn expect(self, message: &str) -> Loc {
match self {
MaybeLoc::Some(loc) => loc,
MaybeLoc::None => panic!("{}", message),
}
}
/// Equivalent of Option::map
pub fn map<F>(self, f: F) -> Self
where
F: FnOnce(Loc) -> Loc,
{
match self {
MaybeLoc::Some(loc) => Self::Some(f(loc)),
MaybeLoc::None => Self::None,
}
}
/// Equivalent of Option::is_none
pub fn is_none(&self) -> bool {
matches!(self, MaybeLoc::None)
}
/// Equivalent of Option::is_some
pub fn is_some(&self) -> bool {
matches!(self, MaybeLoc::Some(_))
}
/// Equivalent of Option::as_ref
pub fn as_ref(&self) -> Option<&Loc> {
match self {
MaybeLoc::Some(loc) => Some(loc),
MaybeLoc::None => None,
}
}
}
impl From<Loc> for MaybeLoc {
fn from(loc: Loc) -> Self {
Self::Some(loc)
}
}
}