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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
use crate::{FieldDef};
use proc_macro2::Span;
use quote::quote;
use case::CaseExt;
use syn::{Data, DataEnum, DataStruct, Error, Field, Fields, FieldsNamed};
pub struct InputParser;
#[derive(Debug, Clone)]
pub struct NamedVariant {
pub name: String,
pub named: bool,
pub fields: Vec<Field>,
}
#[derive(Debug, Clone, Default, PartialEq)]
pub struct NamedVariantDef<'a> {
pub name: String,
pub named: bool,
pub fields: Vec<FieldDef<'a>>,
}
impl InputParser {
pub fn get_fields<'a>(data: &'a Data) -> Vec<&'a Field> {
let named_fields_result = Self::get_fields_named(data);
if let Ok(named_fields) = named_fields_result {
named_fields.named.iter().collect()
} else {
Vec::new()
}
}
// pub fn get_fields_named(data: &Data) -> syn::Result<FieldsNamed> {
// let fields = match data {
// Data::Enum(DataEnum {
// enum_token: token::Enum { span },
// ..
// })
// | Data::Union(DataUnion {
// union_token: token::Union { span },
// ..
// }) => {
// return Err(Error::new(*span, "Expected a `struct`"));
// }
//
// Data::Struct(DataStruct {
// fields: Fields::Named(it),
// ..
// }) => it,
//
// Data::Struct(_) => {
// return Err(Error::new(
// Span::call_site(),
// "Expected a `struct` with named fields",
// ));
// }
// };
// Ok(fields.clone())
// }
pub fn get_fields_named(data: &Data) -> syn::Result<&FieldsNamed> {
if let Data::Struct(DataStruct { fields, .. }) = data {
match fields {
Fields::Named(it) => Ok(it),
_ => Err(Error::new(
Span::call_site(),
"Expected a struct with named fields",
)),
}
} else {
Err(Error::new(Span::call_site(), "Expected a struct"))
}
}
pub fn is_enum(data: &Data) -> bool {
if let Data::Enum(DataEnum { .. }) = data {
true
} else {
false
}
}
pub fn is_struct(data: &Data) -> bool {
if let Data::Struct(DataStruct { .. }) = data {
true
} else {
false
}
}
pub fn get_enum_variant(data: &Data) -> syn::Result<Vec<NamedVariant>> {
let Data::Enum(DataEnum { ref variants, .. }) = data else {
return Err(syn::Error::new_spanned(quote! { enum }, "expect enum"));
};
let mut named_variants = Vec::new();
for variant in variants {
match &variant.fields {
Fields::Named(fields_named) => {
named_variants.push(NamedVariant {
name: variant.ident.to_string(),
named: true,
fields: fields_named.clone().named.into_iter().collect(),
});
}
Fields::Unnamed(fields_unnamed) => {
named_variants.push(NamedVariant {
name: variant.ident.to_string(),
named: false,
fields: fields_unnamed.clone().unnamed.into_iter().collect(),
});
}
Fields::Unit => {
named_variants.push(NamedVariant {
name: variant.ident.to_string(),
named: false,
fields: Vec::new(),
});
}
}
}
if named_variants.is_empty() {
Err(Error::new_spanned(
quote! { enum },
"no variant found in the enum",
))
} else {
Ok(named_variants)
}
}
pub fn get_enum_variant_defs(data: &Data) -> syn::Result<Vec<NamedVariantDef>> {
let Data::Enum(DataEnum { ref variants, .. }) = data else {
return Err(syn::Error::new_spanned(quote! { enum }, "expect enum"));
};
let mut named_variants = Vec::new();
for variant in variants {
match &variant.fields {
Fields::Named(fields_named) => {
named_variants.push(NamedVariantDef {
name: variant.ident.to_string(),
named: true,
fields: fields_named
.named
.iter()
.map(|f| FieldDef::parse(f, true, None, None))
.collect(),
});
}
Fields::Unnamed(fields_unnamed) => {
let column_name = variant.ident.to_string().to_snake();
named_variants.push(NamedVariantDef {
name: variant.ident.to_string(),
named: false,
fields: fields_unnamed
.unnamed
.iter().enumerate()
.map(|(idx, f)| FieldDef::parse(f, true, Some(idx), Some(column_name.clone())))
.collect(),
});
}
Fields::Unit => {
named_variants.push(NamedVariantDef {
name: variant.ident.to_string(),
named: false,
fields: Vec::new(),
});
}
}
}
if named_variants.is_empty() {
Err(Error::new_spanned(
quote! { enum },
"no variant found in the enum",
))
} else {
Ok(named_variants)
}
}
}