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
|
use syn::parse::{Parse, ParseStream};
use syn::punctuated::Punctuated;
use syn::{braced, Ident, LitBool, Token, TypePath};
use crate::util::iterator_ext::IteratorExt;
pub const INJECTABLE_MACRO_FLAGS: &[&str] = &["no_doc_hidden"];
pub struct InjectableMacroFlag
{
pub flag: Ident,
pub is_on: LitBool,
}
impl Parse for InjectableMacroFlag
{
fn parse(input: ParseStream) -> syn::Result<Self>
{
let input_forked = input.fork();
let flag: Ident = input_forked.parse()?;
let flag_str = flag.to_string();
if !INJECTABLE_MACRO_FLAGS.contains(&flag_str.as_str()) {
return Err(input.error(format!(
"Unknown flag '{}'. Expected one of [ {} ]",
flag_str,
INJECTABLE_MACRO_FLAGS.join(",")
)));
}
input.parse::<Ident>()?;
input.parse::<Token![=]>()?;
let is_on: LitBool = input.parse()?;
Ok(Self { flag, is_on })
}
}
pub struct InjectableMacroArgs
{
pub interface: Option<TypePath>,
pub flags: Punctuated<InjectableMacroFlag, Token![,]>,
}
impl Parse for InjectableMacroArgs
{
fn parse(input: ParseStream) -> syn::Result<Self>
{
let interface = input.parse::<TypePath>().ok();
if interface.is_some() {
let comma_input_lookahead = input.lookahead1();
if !comma_input_lookahead.peek(Token![,]) {
return Ok(Self {
interface,
flags: Punctuated::new(),
});
}
input.parse::<Token![,]>()?;
}
if input.is_empty() {
return Ok(Self {
interface,
flags: Punctuated::new(),
});
}
let braced_content;
braced!(braced_content in input);
let flags = braced_content.parse_terminated(InjectableMacroFlag::parse)?;
let flag_names = flags
.iter()
.map(|flag| flag.flag.to_string())
.collect::<Vec<_>>();
if let Some(dupe_flag_name) = flag_names.iter().find_duplicate() {
return Err(input.error(format!("Duplicate flag '{}'", dupe_flag_name)));
}
Ok(Self { interface, flags })
}
}
|
