/
test-macros.rs
135 lines (108 loc) · 3.62 KB
/
test-macros.rs
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
// force-host
// no-prefer-dynamic
// Proc macros commonly used by tests.
// `panic`/`print` -> `panic_bang`/`print_bang` to avoid conflicts with standard macros.
#![crate_type = "proc-macro"]
extern crate proc_macro;
use proc_macro::{TokenStream, TokenTree};
// Macro that return empty token stream.
#[proc_macro]
pub fn empty(_: TokenStream) -> TokenStream {
TokenStream::new()
}
#[proc_macro_attribute]
pub fn empty_attr(_: TokenStream, _: TokenStream) -> TokenStream {
TokenStream::new()
}
#[proc_macro_derive(Empty, attributes(empty_helper))]
pub fn empty_derive(_: TokenStream) -> TokenStream {
TokenStream::new()
}
// Macro that panics.
#[proc_macro]
pub fn panic_bang(_: TokenStream) -> TokenStream {
panic!("panic-bang");
}
#[proc_macro_attribute]
pub fn panic_attr(_: TokenStream, _: TokenStream) -> TokenStream {
panic!("panic-attr");
}
#[proc_macro_derive(Panic, attributes(panic_helper))]
pub fn panic_derive(_: TokenStream) -> TokenStream {
panic!("panic-derive");
}
// Macros that return the input stream.
#[proc_macro]
pub fn identity(input: TokenStream) -> TokenStream {
input
}
#[proc_macro_attribute]
pub fn identity_attr(_: TokenStream, input: TokenStream) -> TokenStream {
input
}
#[proc_macro_derive(Identity, attributes(identity_helper))]
pub fn identity_derive(input: TokenStream) -> TokenStream {
input
}
// Macros that iterate and re-collect the input stream.
#[proc_macro]
pub fn recollect(input: TokenStream) -> TokenStream {
input.into_iter().collect()
}
#[proc_macro_attribute]
pub fn recollect_attr(_: TokenStream, input: TokenStream) -> TokenStream {
input.into_iter().collect()
}
#[proc_macro_derive(Recollect, attributes(recollect_helper))]
pub fn recollect_derive(input: TokenStream) -> TokenStream {
input.into_iter().collect()
}
// Macros that print their input in the original and re-collected forms (if they differ).
fn print_helper(input: TokenStream, kind: &str) -> TokenStream {
print_helper_ext(input, kind, true)
}
fn print_helper_ext(input: TokenStream, kind: &str, debug: bool) -> TokenStream {
let input_display = format!("{}", input);
let input_debug = format!("{:#?}", input);
let recollected = input.into_iter().collect();
let recollected_display = format!("{}", recollected);
let recollected_debug = format!("{:#?}", recollected);
println!("PRINT-{} INPUT (DISPLAY): {}", kind, input_display);
if recollected_display != input_display {
println!("PRINT-{} RE-COLLECTED (DISPLAY): {}", kind, recollected_display);
}
if debug {
println!("PRINT-{} INPUT (DEBUG): {}", kind, input_debug);
if recollected_debug != input_debug {
println!("PRINT-{} RE-COLLECTED (DEBUG): {}", kind, recollected_debug);
}
}
recollected
}
#[proc_macro]
pub fn print_bang(input: TokenStream) -> TokenStream {
print_helper(input, "BANG")
}
#[proc_macro]
pub fn print_bang_consume(input: TokenStream) -> TokenStream {
print_helper(input, "BANG");
TokenStream::new()
}
#[proc_macro_attribute]
pub fn print_attr(args: TokenStream, input: TokenStream) -> TokenStream {
let debug = match &args.into_iter().collect::<Vec<_>>()[..] {
[TokenTree::Ident(ident)] if ident.to_string() == "nodebug" => false,
_ => true,
};
print_helper_ext(input, "ATTR", debug)
}
#[proc_macro_attribute]
pub fn print_attr_args(args: TokenStream, input: TokenStream) -> TokenStream {
print_helper(args, "ATTR_ARGS");
input
}
#[proc_macro_derive(Print, attributes(print_helper))]
pub fn print_derive(input: TokenStream) -> TokenStream {
print_helper(input, "DERIVE");
TokenStream::new()
}