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
|
use std::collections::HashMap;
use proc_macro2::TokenStream as TokenStream2;
use quote::{format_ident, quote};
use syn::{
parse::{Parse, ParseStream, Result},
punctuated::Punctuated,
Expr, ExprArray, Ident, Lit, Path, Token,
};
struct KeyValue {
key: Ident,
_eq: Token![=],
value: Expr,
}
impl Parse for KeyValue {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Self {
key: input.parse()?,
_eq: input.parse()?,
value: input.parse()?,
})
}
}
pub struct RawLintMeta(HashMap<Ident, Expr>);
impl Parse for RawLintMeta {
fn parse(input: ParseStream) -> Result<Self> {
Ok(Self(
Punctuated::<KeyValue, Token![,]>::parse_terminated(input)?
.into_iter()
.map(|item| (item.key, item.value))
.collect(),
))
}
}
pub struct LintMeta<'μ> {
name: &'μ Lit,
note: &'μ Lit,
code: &'μ Lit,
match_with: MatchWith<'μ>,
}
enum MatchWith<'π> {
Path(&'π Path),
Array(&'π ExprArray),
}
fn extract<'λ>(id: &str, raw: &'λ RawLintMeta) -> &'λ Expr {
raw.0
.get(&format_ident!("{}", id))
.unwrap_or_else(|| panic!("`{}` not present", id))
}
fn as_lit(e: &Expr) -> &Lit {
match e {
Expr::Lit(l) => &l.lit,
_ => panic!("expected a literal"),
}
}
impl<'μ> LintMeta<'μ> {
fn from_raw(raw: &'μ RawLintMeta) -> Self {
let name = as_lit(extract("name", raw));
let note = as_lit(extract("note", raw));
let code = as_lit(extract("code", raw));
let match_with_expr = extract("match_with", raw);
let match_with = match match_with_expr {
Expr::Path(p) => MatchWith::Path(&p.path),
Expr::Array(a) => MatchWith::Array(a),
_ => panic!("`match_with` is neither a path nor an array"),
};
Self {
name,
note,
code,
match_with,
}
}
fn generate_name_fn(&self) -> TokenStream2 {
let name_str = self.name;
return quote! {
fn name(&self) -> &'static str {
#name_str
}
};
}
fn generate_note_fn(&self) -> TokenStream2 {
let note_str = self.note;
return quote! {
fn note(&self) -> &'static str {
#note_str
}
};
}
fn generate_code_fn(&self) -> TokenStream2 {
let code_int = self.code;
return quote! {
fn code(&self) -> u32 {
#code_int
}
};
}
fn generate_match_with_fn(&self) -> TokenStream2 {
match self.match_with {
MatchWith::Path(p) => {
quote! {
fn match_with(&self, with: &SyntaxKind) -> bool {
#p == *with
}
}
}
MatchWith::Array(a) => {
quote! {
fn match_with(&self, with: &SyntaxKind) -> bool {
#a.contains(with)
}
}
}
}
}
fn generate_match_kind_fn(&self) -> TokenStream2 {
match self.match_with {
MatchWith::Path(p) => {
quote! {
fn match_kind(&self) -> Vec<SyntaxKind> {
vec![#p]
}
}
}
MatchWith::Array(a) => {
quote! {
fn match_kind(&self) -> Vec<SyntaxKind> {
#a.to_vec()
}
}
}
}
}
fn generate_report_fn(&self) -> TokenStream2 {
quote! {
fn report(&self) -> crate::Report {
crate::Report::new(self.note(), self.code())
}
}
}
}
pub fn generate_meta_impl(struct_name: &Ident, meta: &RawLintMeta) -> TokenStream2 {
let not_raw = LintMeta::from_raw(&meta);
let name_fn = not_raw.generate_name_fn();
let note_fn = not_raw.generate_note_fn();
let code_fn = not_raw.generate_code_fn();
let match_with_fn = not_raw.generate_match_with_fn();
let match_kind = not_raw.generate_match_kind_fn();
let report_fn = not_raw.generate_report_fn();
quote! {
impl crate::Metadata for #struct_name {
#name_fn
#note_fn
#code_fn
#match_with_fn
#match_kind
#report_fn
}
}
}
|
