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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
use proc_macro2::TokenStream;
use proc_macro_error::abort;
use quote::{quote, quote_spanned};
use syn::{punctuated::Punctuated, spanned::Spanned, token::Comma, Field, Ident, Type};
use crate::{
attrs::{Attrs, Kind, ParserKind},
utils::{sub_type, subty_if_name, Ty},
};
pub fn gen_for_struct(
struct_name: &Ident,
fields: &Punctuated<Field, Comma>,
parent_attribute: &Attrs,
) -> TokenStream {
let constructor = gen_constructor(fields, parent_attribute);
quote! {
#[allow(dead_code, unreachable_code, unused_variables)]
#[allow(
clippy::style,
clippy::complexity,
clippy::pedantic,
clippy::restriction,
clippy::perf,
clippy::deprecated,
clippy::nursery,
clippy::cargo
)]
#[deny(clippy::correctness)]
impl ::clap::FromArgMatches for #struct_name {
fn from_arg_matches(matches: &::clap::ArgMatches) -> Self {
#struct_name #constructor
}
}
}
}
pub fn gen_for_enum(name: &Ident) -> TokenStream {
quote! {
#[allow(dead_code, unreachable_code, unused_variables)]
#[allow(
clippy::style,
clippy::complexity,
clippy::pedantic,
clippy::restriction,
clippy::perf,
clippy::deprecated,
clippy::nursery,
clippy::cargo
)]
#[deny(clippy::correctness)]
impl ::clap::FromArgMatches for #name {
fn from_arg_matches(matches: &::clap::ArgMatches) -> Self {
<#name as ::clap::Subcommand>::from_subcommand(matches.subcommand()).unwrap()
}
}
}
}
fn gen_arg_enum_parse(ty: &Type, attrs: &Attrs) -> TokenStream {
let ci = attrs.case_insensitive();
quote_spanned! { ty.span()=>
|s| <#ty as ::clap::ArgEnum>::from_str(s, #ci).unwrap()
}
}
pub fn gen_constructor(fields: &Punctuated<Field, Comma>, parent_attribute: &Attrs) -> TokenStream {
let fields = fields.iter().map(|field| {
let attrs = Attrs::from_field(
field,
parent_attribute.casing(),
parent_attribute.env_casing(),
);
let field_name = field.ident.as_ref().unwrap();
let kind = attrs.kind();
match &*kind {
Kind::ExternalSubcommand => {
abort! { kind.span(),
"`external_subcommand` can be used only on enum variants"
}
}
Kind::Subcommand(ty) => {
let subcmd_type = match (**ty, sub_type(&field.ty)) {
(Ty::Option, Some(sub_type)) => sub_type,
_ => &field.ty,
};
let unwrapper = match **ty {
Ty::Option => quote!(),
_ => quote_spanned!( ty.span()=> .unwrap() ),
};
quote_spanned! { kind.span()=>
#field_name: {
<#subcmd_type as ::clap::Subcommand>::from_subcommand(matches.subcommand())
#unwrapper
}
}
}
Kind::Flatten => quote_spanned! { kind.span()=>
#field_name: ::clap::FromArgMatches::from_arg_matches(matches)
},
Kind::Skip(val) => match val {
None => quote_spanned!(kind.span()=> #field_name: Default::default()),
Some(val) => quote_spanned!(kind.span()=> #field_name: (#val).into()),
},
Kind::Arg(ty) => {
use self::ParserKind::*;
let parser = attrs.parser();
let func = &parser.func;
let span = parser.kind.span();
let (value_of, values_of, mut parse) = match *parser.kind {
FromStr => (
quote_spanned!(span=> value_of),
quote_spanned!(span=> values_of),
func.clone(),
),
TryFromStr => (
quote_spanned!(span=> value_of),
quote_spanned!(span=> values_of),
quote_spanned!(func.span()=> |s| #func(s).unwrap()),
),
FromOsStr => (
quote_spanned!(span=> value_of_os),
quote_spanned!(span=> values_of_os),
func.clone(),
),
TryFromOsStr => (
quote_spanned!(span=> value_of_os),
quote_spanned!(span=> values_of_os),
quote_spanned!(func.span()=> |s| #func(s).unwrap()),
),
FromOccurrences => (
quote_spanned!(span=> occurrences_of),
quote!(),
func.clone(),
),
FromFlag => (quote!(), quote!(), func.clone()),
};
let flag = *attrs.parser().kind == ParserKind::FromFlag;
let occurrences = *attrs.parser().kind == ParserKind::FromOccurrences;
let name = attrs.cased_name();
let field_value = match **ty {
Ty::Bool => quote_spanned! { ty.span()=>
matches.is_present(#name)
},
Ty::Option => {
if attrs.is_enum() {
if let Some(subty) = subty_if_name(&field.ty, "Option") {
parse = gen_arg_enum_parse(subty, &attrs);
}
}
quote_spanned! { ty.span()=>
matches.#value_of(#name)
.map(#parse)
}
}
Ty::OptionOption => quote_spanned! { ty.span()=>
if matches.is_present(#name) {
Some(matches.#value_of(#name).map(#parse))
} else {
None
}
},
Ty::OptionVec => quote_spanned! { ty.span()=>
if matches.is_present(#name) {
Some(matches.#values_of(#name)
.map(|v| v.map(#parse).collect())
.unwrap_or_else(Vec::new))
} else {
None
}
},
Ty::Vec => {
if attrs.is_enum() {
if let Some(subty) = subty_if_name(&field.ty, "Vec") {
parse = gen_arg_enum_parse(subty, &attrs);
}
}
quote_spanned! { ty.span()=>
matches.#values_of(#name)
.map(|v| v.map(#parse).collect())
.unwrap_or_else(Vec::new)
}
}
Ty::Other if occurrences => quote_spanned! { ty.span()=>
#parse(matches.#value_of(#name))
},
Ty::Other if flag => quote_spanned! { ty.span()=>
#parse(matches.is_present(#name))
},
Ty::Other => {
if attrs.is_enum() {
parse = gen_arg_enum_parse(&field.ty, &attrs);
}
quote_spanned! { ty.span()=>
matches.#value_of(#name)
.map(#parse)
.unwrap()
}
}
};
quote_spanned!(field.span()=> #field_name: #field_value )
}
}
});
quote! {{
#( #fields ),*
}}
}