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
use crate::new_ident;
use crate::parsed_type::ParsedType;
use crate::fce_ast_types;
use quote::quote;
pub(super) struct RecordDeserializerDescriptor {
pub(super) deserializer: proc_macro2::TokenStream,
pub(super) type_constructor: proc_macro2::TokenStream,
}
pub(super) trait RecordDeserializerGlueCodeGenerator {
fn generate_deserializer(&self) -> RecordDeserializerDescriptor;
}
impl RecordDeserializerGlueCodeGenerator for fce_ast_types::AstRecordItem {
fn generate_deserializer(&self) -> RecordDeserializerDescriptor {
let mut field_values = Vec::with_capacity(self.fields.len());
let mut deserializer = proc_macro2::TokenStream::new();
let mut value_id: usize = 0;
for (id, ast_field) in self.fields.iter().enumerate() {
let field = new_ident!(format!("field_{}", id));
let field_d = match &ast_field.ty {
ParsedType::Boolean => {
quote! {
let #field = raw_record[#value_id] != 0;
}
}
ParsedType::I8 => {
quote! {
let #field = raw_record[#value_id] as i8;
}
}
ParsedType::I16 => {
quote! {
let #field = raw_record[#value_id] as i16;
}
}
ParsedType::I32 => {
quote! {
let #field = raw_record[#value_id] as i32;
}
}
ParsedType::I64 => {
quote! {
let #field = raw_record[#value_id] as i64;
}
}
ParsedType::U8 => {
quote! {
let #field = raw_record[#value_id] as u8;
}
}
ParsedType::U16 => {
quote! {
let #field = raw_record[#value_id] as u16;
}
}
ParsedType::U32 => {
quote! {
let #field = raw_record[#value_id] as u32;
}
}
ParsedType::U64 => {
quote! {
let #field = raw_record[#value_id] as u64;
}
}
ParsedType::F32 => {
quote! {
let #field = raw_record[#value_id] as f32;
}
}
ParsedType::F64 => {
quote! {
let #field = f64::from_bits(raw_record[#value_id]);
}
}
ParsedType::Utf8String => {
let ptr_id = value_id;
let size_id = value_id + 1;
value_id += 1;
quote! {
let #field = unsafe { String::from_raw_parts(raw_record[#ptr_id] as _, raw_record[#size_id] as _, raw_record[#size_id] as _) };
}
}
ParsedType::Vector(ty) => {
let generated_deserializer_name =
format!("__fce_generated_vec_deserializer_{}", value_id);
let generated_deserializer_ident = new_ident!(generated_deserializer_name);
let vector_deserializer = crate::parsed_type::generate_vector_deserializer(
ty,
&generated_deserializer_name,
);
let ptr_id = value_id;
let size_id = value_id + 1;
value_id += 1;
quote! {
#vector_deserializer
let #field = unsafe { #generated_deserializer_ident(raw_record[#ptr_id] as _, raw_record[#size_id] as _) };
}
}
ParsedType::Record(record_name) => {
let ptr_id = value_id;
let record_ident = new_ident!(record_name);
quote! {
let #field = #record_ident::__fce_generated_deserialize(raw_record[#ptr_id] as _);
}
}
};
field_values.push(field);
deserializer.extend(field_d);
value_id += 1;
}
let type_constructor = match self.fields.first() {
Some(ast_field) if ast_field.name.is_some() => {
let field_names = self
.fields
.iter()
.map(|field| {
new_ident!(field.name.clone().expect("all fields should have name"))
})
.collect::<Vec<_>>();
quote! {
Self {
#(#field_names: #field_values),*
}
}
}
Some(_) => {
quote! {
Self (
#(#field_values),*
)
}
}
_ => quote! {},
};
RecordDeserializerDescriptor {
deserializer,
type_constructor,
}
}
}