structural 0.2.2

Abstractions over fields.
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
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

#[cfg(feature="better_macros")]
#[allow(non_camel_case_types)]
#[allow(dead_code)]
#[macro_use]
mod for_better_macros{
    use crate::{chars,type_level::_private::TString};

    pub type S_foo=TString<(chars::_f,chars::_o,chars::_o)>;
    pub type S_bar=TString<(chars::_b,chars::_a,chars::_r)>;
    pub type S_baz=TString<(chars::_b,chars::_a,chars::_z)>;
    pub type S_a=TString<(chars::_a,)>;
    pub type S_b=TString<(chars::_b,)>;
    pub type S_c=TString<(chars::_c,)>;
    pub type S_d=TString<(chars::_d,)>;
    pub type S_0=TString<(chars::_0,)>;
    pub type S_1=TString<(chars::_1,)>;
    pub type S_2=TString<(chars::_2,)>;
    pub type S_3=TString<(chars::_3,)>;
    pub type S_4=TString<(chars::_4,)>;

    pub fn assert_ty<T,U>(_ident:U)
    where
        T:core_extensions::TypeIdentity<Type=U>
    {}

    macro_rules! path_assertion {
        (fp!( $($fp_params:tt)* ),$ty:ty $(,)?) => (
            assert_ty::<
                $ty,
                FP!($($fp_params)*),
            >(fp!($($fp_params)*));
        )
    }

}

/// Tests that the fp and FP macros are correct
#[allow(non_camel_case_types)]
#[cfg(feature="better_macros")]
#[test]
fn identifier_macros_equality(){
    use crate::chars;
    use crate::type_level::{_private::TString,FieldPath};
    use self::for_better_macros::*;

    type S_abcd=TString<(chars::_a,chars::_b,chars::_c,chars::_d)>;
    type S_21=TString<(chars::_2,chars::_1)>;
    type S_ab0=TString<(chars::_a,chars::_b,chars::_0)>;

    path_assertion!(fp!(abcd),FieldPath<(S_abcd,)>);
    path_assertion!(fp!(0),FieldPath<(S_0,)>);
    path_assertion!(fp!(21),FieldPath<(S_21,)>);
    path_assertion!(fp!(ab0),FieldPath<(S_ab0,)>);
    path_assertion!(fp!(0.1),FieldPath<(S_0,S_1)>);
    path_assertion!(fp!(0.1.2),FieldPath<(S_0,S_1,S_2)>);
    path_assertion!(fp!(0.1.2.3),FieldPath<(S_0,S_1,S_2,S_3)>);
    path_assertion!(fp!(0.1.2.3.4),FieldPath<(S_0,S_1,S_2,S_3,S_4)>);
    path_assertion!(fp!(0.foo),FieldPath<(S_0,S_foo)>);
    path_assertion!(fp!(0.foo.1),FieldPath<(S_0,S_foo,S_1)>);
    path_assertion!(fp!(0.foo.1.bar),FieldPath<(S_0,S_foo,S_1,S_bar)>);

    /*
    path_assertion!(fp!(0[FP!(0)]),FieldPath<(S_0,S_0)>);
    path_assertion!(fp!(0.[FP!(0)]),FieldPath<(S_0,S_0)>);
    path_assertion!(fp!(0[FP!(1)].2),FieldPath<(S_0,S_1,S_2)>);
    path_assertion!(fp!(0.[FP!(1)].2),FieldPath<(S_0,S_1,S_2)>);
    path_assertion!(fp!([FP!(0)].2),FieldPath<(S_0,S_2)>);
    path_assertion!(fp!([FP!(0)]),FieldPath<(S_0,)>);

    path_assertion!(fp!(0.(FP!(0.1))),FieldPath<(S_0,S_0,S_1)>);
    path_assertion!(fp!((FP!(0.1)).2),FieldPath<(S_0,S_1,S_2)>);
    path_assertion!(fp!(0.(FP!(0.1)).2),FieldPath<(S_0,S_0,S_1,S_2)>);
    path_assertion!(fp!((FP!(0.1))),FieldPath<(S_0,S_1)>);
    
    path_assertion!(fp!((FP!(0.1))[S_3]),FieldPath<(S_0,S_1,S_3)>);
    path_assertion!(fp!([S_3].(FP!(0.1))),FieldPath<(S_3,S_0,S_1)>);
    path_assertion!(fp!([S_3].(FP!(0.1)).[S_a]),FieldPath<(S_3,S_0,S_1,S_a)>);
    */
}

#[allow(non_camel_case_types)]
#[cfg(feature="better_macros")]
#[test]
fn field_paths_equality(){
    use crate::type_level::{FieldPath,FieldPathSet,UniquePaths};

    use self::for_better_macros::*;

    path_assertion!{
        fp!(foo,bar),
        FieldPathSet<(FieldPath<(S_foo,)>,FieldPath<(S_bar,)>,),UniquePaths>
    }

    path_assertion!{
        fp!(foo.bar,baz),
        FieldPathSet<(FieldPath<(S_foo,S_bar)>,FieldPath<(S_baz,)>,),UniquePaths>,
    }

    path_assertion!{
        fp!(foo.bar,a.b),
        FieldPathSet<(FieldPath<(S_foo,S_bar)>,FieldPath<(S_a,S_b)>,),UniquePaths>,
    }

    path_assertion!{
        fp!(0,foo),
        FieldPathSet<(FieldPath<(S_0,)>,FieldPath<(S_foo,)>,),UniquePaths>,
    }

    path_assertion!{
        fp!(0.1,foo),
        FieldPathSet<(FieldPath<(S_0,S_1)>,FieldPath<(S_foo,)>,),UniquePaths>,
    }
    path_assertion!{
        fp!(0.1.2,foo),
        FieldPathSet<(FieldPath<(S_0,S_1,S_2)>,FieldPath<(S_foo,)>,),UniquePaths>,
    }
    path_assertion!{
        fp!(foo,0.1.2.3),
        FieldPathSet<(FieldPath<(S_foo,)>,FieldPath<(S_0,S_1,S_2,S_3)>),UniquePaths>,
    }
    path_assertion!{
        fp!(0.1.2.3.4,foo),
        FieldPathSet<(FieldPath<(S_0,S_1,S_2,S_3,S_4)>,FieldPath<(S_foo,)>,),UniquePaths>,
    }
    
    /*
    path_assertion!{
        fp!((FP!(a.b)).(FP!(c.d)),0),
        FieldPathSet<(FieldPath<(S_a,S_b,S_c,S_d)>,FieldPath<(S_0,)>,),AliasedPaths>,
    }
    */

}






mod make_struct_tests{
    use crate::{
        type_level::FieldPath,
        GetFieldExt,
    };

    crate::structural_alias!{
        trait Hi<T>{
            mut move a:u32,
            mut move b:Option<&'static str>,
            mut move c:T,
        }
    }

    fn returns_hi()->impl Hi<&'static str>{
        make_struct!{
            a:0,
            b:"hello".into(),
            c:Default::default(),
        }
    }

    #[test]
    fn make_struct_test(){
        {
            let hi=returns_hi();
            
            // I had to write it like this due to a rustc bug.
            // https://github.com/rust-lang/rust/issues/66057
            assert_eq!(hi.field_::<FP!(a)>(FieldPath::NEW),&0);
            assert_eq!(hi.field_::<FP!(b)>(FieldPath::NEW).unwrap(), "hello");
            assert_eq!(hi.field_::<FP!(c)>(FieldPath::NEW), &"");
        }

        {
            let hi:&dyn Hi<&'static str>=&returns_hi();
            assert_eq!(hi.field_(fp!(a)),&0);
            assert_eq!(hi.field_(fp!(b)).unwrap(), "hello");
            assert_eq!(hi.field_(fp!(c)), &"");
        }
    }
}


mod names_module_tests{
    field_path_aliases_module!{
        mod names_a{
            _a,
            _b,
            _0,
            c,
            d=0,
            e=10,
            g=abcd,
            h=(a,b,c),
            i=(0,3,5),
            j=(p), 
        }
    }
    #[test]
    fn names_module_a(){
        let _:names_a::_a=fp!(_a);
        let _:names_a::_b=fp!(_b);
        let _:names_a::_0=fp!(_0);
        let _:names_a::c=fp!(c);
        let _:names_a::d=fp!(0);
        let _:names_a::e=fp!(10);
        let _:names_a::g=fp!(abcd);
        let _:names_a::h=fp!(a,b,c);
        let _:names_a::i=fp!(0,3,5);
        let _:names_a::j=fp!(p);
    }
}