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
use crate::{
environment::lexical_environment::{new_declarative_environment, VariableScope},
exec::Executable,
gc::{Finalize, Trace},
syntax::ast::node::{Block, Identifier, Node},
BoaProfiler, Context, Result, Value,
};
use std::fmt;
#[cfg(feature = "deser")]
use serde::{Deserialize, Serialize};
#[cfg(test)]
mod tests;
#[cfg_attr(feature = "deser", derive(Serialize, Deserialize))]
#[derive(Clone, Debug, Trace, Finalize, PartialEq)]
pub struct Try {
block: Block,
catch: Option<Catch>,
finally: Option<Finally>,
}
impl Try {
pub(in crate::syntax) fn new<B>(
block: B,
catch: Option<Catch>,
finally: Option<Finally>,
) -> Self
where
B: Into<Block>,
{
assert!(
catch.is_some() || finally.is_some(),
"one of catch or finally must be pressent"
);
Self {
block: block.into(),
catch,
finally,
}
}
pub fn block(&self) -> &Block {
&self.block
}
pub fn catch(&self) -> Option<&Catch> {
self.catch.as_ref()
}
pub fn finally(&self) -> Option<&Block> {
self.finally.as_ref().map(Finally::block)
}
pub(in crate::syntax::ast::node) fn display(
&self,
f: &mut fmt::Formatter<'_>,
indentation: usize,
) -> fmt::Result {
write!(f, "{}try ", " ".repeat(indentation))?;
self.block.display(f, indentation)?;
if let Some(ref catch) = self.catch {
catch.display(f, indentation)?;
}
if let Some(ref finally) = self.finally {
finally.display(f, indentation)?;
}
Ok(())
}
}
impl Executable for Try {
fn run(&self, context: &mut Context) -> Result<Value> {
let _timer = BoaProfiler::global().start_event("Try", "exec");
let res = self.block().run(context).map_or_else(
|err| {
if let Some(catch) = self.catch() {
{
let env = &mut context.realm_mut().environment;
env.push(new_declarative_environment(Some(
env.get_current_environment_ref().clone(),
)));
if let Some(param) = catch.parameter() {
env.create_mutable_binding(
param.to_owned(),
false,
VariableScope::Block,
)
.map_err(|e| e.to_error(context))?;
let env = &mut context.realm_mut().environment;
env.initialize_binding(param, err)
.map_err(|e| e.to_error(context))?;
}
}
let res = catch.block().run(context);
let _ = context.realm_mut().environment.pop();
res
} else {
Err(err)
}
},
Ok,
);
if let Some(finally) = self.finally() {
finally.run(context)?;
}
res
}
}
impl fmt::Display for Try {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.display(f, 0)
}
}
impl From<Try> for Node {
fn from(try_catch: Try) -> Self {
Self::Try(try_catch)
}
}
#[cfg_attr(feature = "deser", derive(Serialize, Deserialize))]
#[derive(Clone, Debug, Trace, Finalize, PartialEq)]
pub struct Catch {
parameter: Option<Identifier>,
block: Block,
}
impl Catch {
pub(in crate::syntax) fn new<OI, I, B>(parameter: OI, block: B) -> Self
where
OI: Into<Option<I>>,
I: Into<Identifier>,
B: Into<Block>,
{
Self {
parameter: parameter.into().map(I::into),
block: block.into(),
}
}
pub fn parameter(&self) -> Option<&str> {
self.parameter.as_ref().map(Identifier::as_ref)
}
pub fn block(&self) -> &Block {
&self.block
}
pub(super) fn display(&self, f: &mut fmt::Formatter<'_>, indentation: usize) -> fmt::Result {
f.write_str(" catch")?;
if let Some(ref param) = self.parameter {
write!(f, "({})", param)?;
}
f.write_str(" ")?;
self.block.display(f, indentation)
}
}
impl fmt::Display for Catch {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.display(f, 0)
}
}
#[cfg_attr(feature = "deser", derive(Serialize, Deserialize))]
#[derive(Clone, Debug, Trace, Finalize, PartialEq)]
pub struct Finally {
block: Block,
}
impl Finally {
pub fn block(&self) -> &Block {
&self.block
}
pub(super) fn display(&self, f: &mut fmt::Formatter<'_>, indentation: usize) -> fmt::Result {
f.write_str(" finally ")?;
self.block.display(f, indentation)
}
}
impl<T> From<T> for Finally
where
T: Into<Block>,
{
fn from(block: T) -> Self {
Self {
block: block.into(),
}
}
}