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
use crate::ast;
use crate::parsing::Opaque;
use crate::{Id, Parse, ParseError, Parser, Spanned, ToTokens};
use runestick::Span;
#[derive(Debug, Clone, PartialEq, Eq, Parse, ToTokens, Spanned)]
#[rune(parse = "meta_only")]
pub struct ExprClosure {
#[rune(id)]
pub id: Option<Id>,
#[rune(iter, meta)]
pub attributes: Vec<ast::Attribute>,
#[rune(iter, meta)]
pub async_token: Option<T![async]>,
#[rune(iter, meta)]
pub move_token: Option<T![move]>,
pub args: ExprClosureArgs,
pub body: ast::Expr,
}
impl ExprClosure {
pub fn item_span(&self) -> Span {
if let Some(async_) = &self.async_token {
async_.span().join(self.args.span())
} else {
self.args.span()
}
}
}
impl Opaque for ExprClosure {
fn id(&self) -> Option<Id> {
self.id
}
}
expr_parse!(Closure, ExprClosure, "closure expression");
#[derive(Debug, Clone, PartialEq, Eq, ToTokens)]
pub enum ExprClosureArgs {
Empty {
token: T![||],
},
List {
open: T![|],
args: Vec<(ast::FnArg, Option<T![,]>)>,
close: T![|],
},
}
impl ExprClosureArgs {
pub fn len(&self) -> usize {
match self {
Self::Empty { .. } => 0,
Self::List { args, .. } => args.len(),
}
}
pub fn as_slice(&self) -> &[(ast::FnArg, Option<T![,]>)] {
match self {
Self::Empty { .. } => &[],
Self::List { args, .. } => &args[..],
}
}
pub fn as_slice_mut(&mut self) -> &mut [(ast::FnArg, Option<T![,]>)] {
match self {
Self::Empty { .. } => &mut [],
Self::List { args, .. } => &mut args[..],
}
}
}
impl Parse for ExprClosureArgs {
fn parse(p: &mut Parser) -> Result<Self, ParseError> {
if let Some(token) = p.parse::<Option<T![||]>>()? {
return Ok(ExprClosureArgs::Empty { token });
}
let open = p.parse()?;
let mut args = Vec::new();
while !p.peek::<T![|]>()? {
let arg = p.parse()?;
let comma = p.parse::<Option<T![,]>>()?;
let is_end = comma.is_none();
args.push((arg, comma));
if is_end {
break;
}
}
Ok(ExprClosureArgs::List {
open,
args,
close: p.parse()?,
})
}
}
impl Spanned for ExprClosureArgs {
fn span(&self) -> Span {
match self {
Self::Empty { token } => token.span(),
Self::List { open, close, .. } => open.span().join(close.span()),
}
}
}