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
use crate::{
builtins::function::FunctionFlags,
exec::Executable,
gc::{Finalize, Trace},
syntax::ast::node::{join_nodes, FormalParameter, Node, StatementList},
Context, JsResult, JsValue,
};
use std::fmt;
#[cfg(feature = "deser")]
use serde::{Deserialize, Serialize};
#[cfg_attr(feature = "deser", derive(Serialize, Deserialize))]
#[derive(Clone, Debug, Trace, Finalize, PartialEq)]
pub struct FunctionExpr {
name: Option<Box<str>>,
parameters: Box<[FormalParameter]>,
body: StatementList,
}
impl FunctionExpr {
pub(in crate::syntax) fn new<N, P, B>(name: N, parameters: P, body: B) -> Self
where
N: Into<Option<Box<str>>>,
P: Into<Box<[FormalParameter]>>,
B: Into<StatementList>,
{
Self {
name: name.into(),
parameters: parameters.into(),
body: body.into(),
}
}
pub fn name(&self) -> Option<&str> {
self.name.as_ref().map(Box::as_ref)
}
pub fn parameters(&self) -> &[FormalParameter] {
&self.parameters
}
pub fn body(&self) -> &StatementList {
&self.body
}
pub(in crate::syntax::ast::node) fn display(
&self,
f: &mut fmt::Formatter<'_>,
indentation: usize,
) -> fmt::Result {
f.write_str("function")?;
if let Some(ref name) = self.name {
write!(f, " {}", name)?;
}
f.write_str("(")?;
join_nodes(f, &self.parameters)?;
f.write_str(") ")?;
self.display_block(f, indentation)
}
pub(in crate::syntax::ast::node) fn display_block(
&self,
f: &mut fmt::Formatter<'_>,
indentation: usize,
) -> fmt::Result {
if self.body().items().is_empty() {
f.write_str("{}")
} else {
f.write_str("{\n")?;
self.body.display(f, indentation + 1)?;
write!(f, "{}}}", " ".repeat(indentation))
}
}
}
impl Executable for FunctionExpr {
fn run(&self, context: &mut Context) -> JsResult<JsValue> {
let val = context.create_function(
self.name().unwrap_or(""),
self.parameters().to_vec(),
self.body().clone(),
FunctionFlags::CONSTRUCTABLE,
)?;
Ok(val)
}
}
impl fmt::Display for FunctionExpr {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.display(f, 0)
}
}
impl From<FunctionExpr> for Node {
fn from(expr: FunctionExpr) -> Self {
Self::FunctionExpr(expr)
}
}