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
use crate::{build_config::BuildConfig, error::*, parser::Rule, CatchAll, CodeBlock};
use sway_types::span;
use pest::iterators::Pair;
use super::scrutinee::Scrutinee;
use super::{Expression, MatchCondition};
#[derive(Debug, Clone)]
pub struct MatchBranch {
pub(crate) condition: MatchCondition,
pub(crate) result: Expression,
pub(crate) span: span::Span,
}
impl MatchBranch {
pub fn parse_from_pair(pair: Pair<Rule>, config: Option<&BuildConfig>) -> CompileResult<Self> {
let path = config.map(|c| c.path());
let mut warnings = Vec::new();
let mut errors = Vec::new();
let span = span::Span {
span: pair.as_span(),
path: path.clone(),
};
let mut branch = pair.clone().into_inner();
let condition = match branch.next() {
Some(o) => o,
None => {
errors.push(CompileError::Internal(
"Unexpected empty iterator in match branch parsing.",
span::Span {
span: pair.as_span(),
path,
},
));
return err(warnings, errors);
}
};
let condition = match condition.into_inner().next() {
Some(e) => {
match e.as_rule() {
Rule::catch_all => MatchCondition::CatchAll(CatchAll {
span: span::Span {
span: e.as_span(),
path: path.clone(),
},
}),
Rule::scrutinee => {
let scrutinee = check!(
Scrutinee::parse_from_pair(e, config),
return err(warnings, errors),
warnings,
errors
);
MatchCondition::Scrutinee(scrutinee)
}
a => {
eprintln!(
"Unimplemented condition: {:?} ({:?}) ({:?})",
a,
e.as_str(),
e.as_rule()
);
errors.push(CompileError::UnimplementedRule(
a,
span::Span {
span: e.as_span(),
path: path.clone(),
},
));
// construct unit expression for error recovery
MatchCondition::CatchAll(CatchAll {
span: span::Span {
span: e.as_span(),
path: path.clone(),
},
})
}
}
}
None => {
errors.push(CompileError::Internal(
"Unexpected empty iterator in match condition parsing.",
span::Span {
span: pair.as_span(),
path,
},
));
return err(warnings, errors);
}
};
let result = match branch.next() {
Some(o) => o,
None => {
errors.push(CompileError::Internal(
"Unexpected empty iterator in match branch parsing.",
span::Span {
span: pair.as_span(),
path,
},
));
return err(warnings, errors);
}
};
let result = match result.as_rule() {
Rule::expr => check!(
Expression::parse_from_pair(result.clone(), config),
Expression::Tuple {
fields: vec![],
span: span::Span {
span: result.as_span(),
path
}
},
warnings,
errors
),
Rule::code_block => {
let span = span::Span {
span: result.as_span(),
path,
};
Expression::CodeBlock {
contents: check!(
CodeBlock::parse_from_pair(result, config),
CodeBlock {
contents: Vec::new(),
whole_block_span: span.clone(),
},
warnings,
errors
),
span,
}
}
_ => unreachable!(),
};
ok(
MatchBranch {
condition,
result,
span,
},
warnings,
errors,
)
}
}