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
107
108
109
110
111
112
113
114
115
116
use syn::{Meta, Token, punctuated::Punctuated};
use crate::{
common::{length::Length, rocket_options::RocketOptions, serde_options::SerdeOptions},
panic,
};
pub(crate) struct Utf8Attribute {
pub(crate) length: Option<(bool, Length)>,
#[cfg_attr(not(feature = "serde"), allow(dead_code))]
pub(crate) serde_options: SerdeOptions,
#[cfg_attr(not(feature = "rocket"), allow(dead_code))]
pub(crate) rocket_options: RocketOptions,
}
impl Utf8Attribute {
pub(crate) fn build_from_meta(meta: &Meta) -> syn::Result<Self> {
let correct_parameters = ["char_length", "byte_length", "serde", "rocket"];
let mut length = None;
let mut serde_options = SerdeOptions::default();
let mut rocket_options = RocketOptions::default();
match meta {
Meta::Path(_) => (),
Meta::NameValue(_) => {
return Err(panic::attribute_incorrect_format(meta.path()));
},
Meta::List(list) => {
let result =
list.parse_args_with(Punctuated::<Meta, Token![,]>::parse_terminated)?;
let mut length_is_set = false;
let mut serde_options_is_set = false;
let mut rocket_options_is_set = false;
let mut handler = |meta: &Meta| -> syn::Result<bool> {
if let Some(ident) = meta.path().get_ident() {
match ident.to_string().as_str() {
"char_length" => {
let v = Length::from_meta(meta)?;
if length_is_set {
return Err(panic::parameter_reset(ident));
}
length_is_set = true;
length = Some((false, v));
return Ok(true);
},
"byte_length" => {
let v = Length::from_meta(meta)?;
if length_is_set {
return Err(panic::parameter_reset(ident));
}
length_is_set = true;
length = Some((true, v));
return Ok(true);
},
"serde" => {
let v = SerdeOptions::from_meta(meta)?;
if serde_options_is_set {
return Err(panic::parameter_reset(ident));
}
serde_options_is_set = true;
serde_options = v;
return Ok(true);
},
"rocket" => {
let v = RocketOptions::from_meta(meta)?;
if rocket_options_is_set {
return Err(panic::parameter_reset(ident));
}
rocket_options_is_set = true;
rocket_options = v;
return Ok(true);
},
_ => (),
}
}
Ok(false)
};
for p in result {
if !handler(&p)? {
return Err(panic::parameter_incorrect_format(
p.path(),
&correct_parameters,
));
}
}
},
}
Ok(Self {
length,
serde_options,
rocket_options,
})
}
}