synca 0.4.1

Write asynchronous code, and synca will create a synchronous version.
Documentation 
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

use std::collections::HashMap;

use syn::{Expr, Type, parse::Parse, Token, Attribute};

use crate::SyncAFold;

#[derive(Debug, PartialEq)]
pub struct SyncAInput {
  pub features: Expr,
  pub types: HashMap<Type, Type>,
  pub attributes: HashMap<Attribute, Attribute>,
}

impl SyncAInput {
  pub fn fold(self) -> SyncAFold {
    SyncAFold {
      is_async: true,
      features: self.features,
      types: self.types,
      attributes: self.attributes,
    }
  }
}

impl Parse for SyncAInput {
  fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
    let features: Expr = input.parse()?;
    let mut types = HashMap::new();
    let mut attributes = HashMap::new();

    while input.parse::<Token![,]>().is_ok() {
      if input.is_empty() {
        break;
      }

      if let Ok(async_ty) = input.parse::<Type>() {
        input.parse::<Token![=>]>()?;
        types.insert(async_ty.clone(), input.parse::<Type>()?);
        continue;
      }

      if let Ok(attrs) = Attribute::parse_outer(input) {
        if attrs.len() > 0 {
          if attrs.len() > 1 {
            panic!("SuncA expected one attribute line synca(feature = tokio, #[tokio::test] => #[test])");
          }
          let at = attrs[0].clone();
          input.parse::<Token![=>]>()?;

          let new_attrs = Attribute::parse_outer(input)?;
          if new_attrs.len() != 1 {
            panic!("SuncA expected one attribute line synca(feature = tokio, #[tokio::test] => #[test])");
          }

          attributes.insert(at.clone(), new_attrs[0].clone());
          continue;  
        }
      }
    }

    Ok(SyncAInput { features, types, attributes })
  }
}

#[cfg(test)]
mod tests {
  use std::collections::HashMap;

  use syn::parse_quote;

  use super::SyncAInput;

  #[test]
  fn parse_one_feature() {
    let attr: SyncAInput = parse_quote!(feature = "async");

    assert_eq!(
      attr,
      SyncAInput {
        features: parse_quote!(feature = "async"),
        types: HashMap::new(),
        attributes: HashMap::new(),
      }
    );
  }

  #[test]
  fn parse_all() {
    let attr: SyncAInput = parse_quote!(all(feature = "foo", feature = "bar"));

    assert_eq!(
      attr,
      SyncAInput {
        features: parse_quote!(all(feature = "foo", feature = "bar")),
        types: HashMap::new(),
        attributes: HashMap::new(),
      }
    );
  }

  #[test]
  fn parse_not() {
    let attr: SyncAInput = parse_quote!(not(all(feature = "sync", feature = "sync_super")));
    
    assert_eq!(
      attr,
      SyncAInput {
        features: parse_quote!(not(all(feature = "sync", feature = "sync_super"))),
        types: HashMap::new(),
        attributes: HashMap::new(),
      }
    );
  }

  #[test]
  fn parse_with_types() {
    let attr: SyncAInput = parse_quote!(
      not(all(feature = "sync", feature = "sync_super")), 
      tokio_postgres::Client => postgres::Client,
      tokio_postgres::NoTls => postgres::NoTls
    );
    let attr2: SyncAInput = parse_quote!(
      not(all(feature = "sync", feature = "sync_super")), 
      tokio_postgres::Client => postgres::Client,
      tokio_postgres::NoTls => postgres::NoTls,
    );
    
    assert_eq!(
      attr,
      SyncAInput {
        features: parse_quote!(not(all(feature = "sync", feature = "sync_super"))),
        types: HashMap::from([
          (parse_quote!(tokio_postgres::Client), parse_quote!(postgres::Client)),
          (parse_quote!(tokio_postgres::NoTls), parse_quote!(postgres::NoTls))
        ]),
        attributes: HashMap::new(),
      }
    );
    assert_eq!(
      attr2,
      SyncAInput {
        features: parse_quote!(not(all(feature = "sync", feature = "sync_super"))),
        types: HashMap::from([
          (parse_quote!(tokio_postgres::Client), parse_quote!(postgres::Client)),
          (parse_quote!(tokio_postgres::NoTls), parse_quote!(postgres::NoTls))
        ]),
        attributes: HashMap::new(),
      }
    );
  }

  #[test]
  fn parse_with_types_and_attrs() {
    let attr: SyncAInput = parse_quote!(
      not(all(feature = "sync", feature = "sync_super")), 
      tokio_postgres::Client => postgres::Client,
      tokio_postgres::NoTls => postgres::NoTls,
      #[tokio::test] => #[test]
    );

    assert_eq!(
      attr,
      SyncAInput {
        features: parse_quote!(not(all(feature = "sync", feature = "sync_super"))),
        types: HashMap::from([
          (parse_quote!(tokio_postgres::Client), parse_quote!(postgres::Client)),
          (parse_quote!(tokio_postgres::NoTls), parse_quote!(postgres::NoTls))
        ]),
        attributes: HashMap::from([
          (parse_quote!(#[tokio::test]), parse_quote!(#[test])),
        ]),
      }
    );
  }
}