error_combinator/
cmberr.rs

1
2pub trait CombineError<EA, EB> {
3    type Out;
4
5    fn left(&mut self, ea: EA);
6    fn right(&mut self, eb: EB);
7    fn finish(self) -> Self::Out;
8}
9
10pub trait CombineErrorBuilder<EA, EB> {
11    type Combiner: CombineError<EA, EB, Out = Self::Out>;
12    type Out;
13
14    fn build() -> Self::Combiner;
15}
16
17// ======================= DefaultCombine =======================
18
19pub struct DefaultCombine<E> {
20    data: Option<E>
21}
22
23impl<E> CombineErrorBuilder<E, E> for DefaultCombine<E> {
24    type Combiner = Self;
25    type Out = E;
26
27    fn build() -> Self::Combiner {
28        DefaultCombine { data:None }
29    }
30}
31
32impl<E> CombineError<E, E> for DefaultCombine<E> {
33    type Out = E;
34
35    fn left(&mut self, ea: E) {
36        self.data = Some(ea);
37    }
38
39    fn right(&mut self, eb: E) {
40        self.data = Some(eb);
41    }
42
43    fn finish(self) -> Self::Out {
44        self.data.unwrap()
45    }
46}
47
48// ======================= CustomCombine =======================
49
50pub struct VecCombine<T> {
51    data: Vec<T>
52}
53
54impl<E> CombineErrorBuilder<E, E> for VecCombine<E> {
55    type Combiner = Self;
56    type Out = Vec<E>;
57
58    fn build() -> Self::Combiner {
59        VecCombine { data: Vec::new() }
60    }
61}
62
63impl<E> CombineErrorBuilder<Vec<E>, E> for VecCombine<E> {
64    type Combiner = Self;
65    type Out = Vec<E>;
66
67    fn build() -> Self::Combiner {
68        VecCombine { data: Vec::new() }
69    }
70}
71
72impl<T> CombineError<T, T> for VecCombine<T> {
73    type Out = Vec<T>;
74
75    fn left(&mut self, ea: T) {
76        self.data.push(ea);
77    }
78
79    fn right(&mut self, eb: T) {
80        self.data.push(eb);
81    }
82
83    fn finish(self) -> Self::Out {
84        self.data
85    }
86}
87
88impl<E> CombineError<Vec<E>, E> for VecCombine<E> {
89    type Out = Vec<E>;
90
91    fn left(&mut self, ea: Vec<E>) {
92        self.data.extend(ea);
93    }
94
95    fn right(&mut self, eb: E) {
96        self.data.push(eb);
97    }
98
99    fn finish(self) -> Self::Out {
100        self.data
101    }
102}
103
error_combinator/cmberr.rs

error_combinator/
cmberr.rs
