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 core::fmt::{self, Display, Formatter};
use proc_macro2::Span;
use syn::Ident;
struct DisplayStringSlice<'a>(&'a [&'static str]);
impl<'a> Display for DisplayStringSlice<'a> {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
for &s in self.0 {
f.write_str("\n ")?;
f.write_str(s)?;
}
Ok(())
}
}
#[inline]
pub(crate) fn not_enum(span: Span) -> syn::Error {
syn::Error::new(span, "only enums can be ordinalized")
}
#[inline]
pub(crate) fn no_variant(span: Span) -> syn::Error {
syn::Error::new(span, "an ordinalized enum needs to have at least one variant")
}
#[inline]
pub(crate) fn not_unit_variant(span: Span) -> syn::Error {
syn::Error::new(span, "an ordinalized enum can only have unit variants")
}
#[inline]
pub(crate) fn unsupported_discriminant(span: Span) -> syn::Error {
syn::Error::new(
span,
"the discriminant of a variant of an ordinalized enum needs to be a legal literal \
integer, a constant variable/function or a constant expression",
)
}
#[inline]
pub(crate) fn constant_variable_on_non_determined_size_enum(span: Span) -> syn::Error {
syn::Error::new(
span,
"the discriminant of a variant can be assigned not to a literal integer only when the \
ordinalized enum is using the `repr` attribute to determine it's size before compilation",
)
}
#[inline]
pub fn list_attribute_usage(name: &Ident, span: Span) -> syn::Error {
syn::Error::new(span, format!("the `{name}` attribute should be a list"))
// use `name = name` to support Rust 1.56
}
#[inline]
pub(crate) fn bool_attribute_usage(name: &Ident, span: Span) -> syn::Error {
syn::Error::new(
span,
format!("the `{name}` attribute should be a name-value pair. The value type is boolean"),
)
// use `name = name` to support Rust 1.56
}
#[inline]
pub(crate) fn sub_attributes_for_ordinalize(span: Span) -> syn::Error {
syn::Error::new(
span,
format!(
"available sub-attributes for the `ordinalize` attribute:{}",
DisplayStringSlice(&[
"impl_trait",
"variant_count",
"variants",
"values",
"ordinal",
"from_ordinal_unsafe",
"from_ordinal",
])
),
)
}
|
