strflags 0.3.1

A string-enum and string-flags with fixed variants that can also accept arbitrary data.
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

use std::borrow::Cow;
use std::marker::PhantomData;

use crate::EcoString;
use crate::Flags;
use crate::FlagsMarker;

/// Items that can be used in [`Flags::contains()`](crate::Flags::contains)
/// 
/// # Warning
/// 
/// Although a few string types are supported,
/// their usage is not encouraged, since
/// we do not perform case conversion in `contains`.
/// 
/// The user should take care to proivde only `flatlowercase` strings.
pub trait Query<T: FlagsMarker> {
    type Iter<'t>: Iterator<Item = &'t str> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t>;
}

impl<T: FlagsMarker> Query<T> for str {
    type Iter<'t> = std::iter::Once<&'t str>;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        std::iter::once(self)
    }
}

impl<T: FlagsMarker> Query<T> for &str {
    type Iter<'t> = std::iter::Once<&'t str> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        std::iter::once(self)
    }
}

impl<T: FlagsMarker> Query<T> for &&str {
    type Iter<'t> = std::iter::Once<&'t str> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        std::iter::once(self)
    }
}

impl<T: FlagsMarker> Query<T> for String {
    type Iter<'t> = std::iter::Once<&'t str>;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        std::iter::once(self.as_str())
    }
}

impl<T: FlagsMarker> Query<T> for &String {
    type Iter<'t> = std::iter::Once<&'t str> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        std::iter::once(self.as_str())
    }
}

impl<'a, T: FlagsMarker> Query<T> for Cow<'a, str> {
    type Iter<'t> = std::iter::Once<&'t str> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        std::iter::once(self.as_ref())
    }
}

impl<'a, 'b, T: FlagsMarker> Query<T> for &'b Cow<'a, str> {
    type Iter<'t> = std::iter::Once<&'t str> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        std::iter::once(self.as_ref())
    }
}


impl<T: FlagsMarker> Query<T> for EcoString {
    type Iter<'t> = std::iter::Once<&'t str>;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        std::iter::once(self.as_str())
    }
}

impl<T: FlagsMarker> Query<T> for &EcoString {
    type Iter<'t> = std::iter::Once<&'t str> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        std::iter::once(self.as_str())
    }
}

impl<T: FlagsMarker> Query<T> for T {
    type Iter<'t> = std::iter::Once<&'t str> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        std::iter::once(self.as_ref())
    }
}

impl<T: FlagsMarker> Query<T> for &T {
    type Iter<'t> = std::iter::Once<&'t str> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        std::iter::once(self.as_ref())
    }
}

impl<T: FlagsMarker> Query<T> for &&T {
    type Iter<'t> = std::iter::Once<&'t str> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        std::iter::once(self.as_ref())
    }
}

impl<T: FlagsMarker> Query<T> for &&&T {
    type Iter<'t> = std::iter::Once<&'t str> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        std::iter::once(self.as_ref())
    }
}


pub struct AsRefStrIter<'t, T>(pub(crate) T, pub(crate) PhantomData<&'t T>);

impl<'t, T, K> Iterator for AsRefStrIter<'t, T> 
        where T: Iterator<Item = &'t K>, K: AsRef<str> + 't {
    type Item = &'t str;

    #[inline]
    fn next(&mut self) -> Option<Self::Item> {
        self.0.next().map(|s| (*s).as_ref())
    }
}

impl<T: FlagsMarker + PartialEq> Query<T> for &[&str] {
    type Iter<'t> = AsRefStrIter<'t, std::slice::Iter<'t, &'t str>> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        AsRefStrIter(self.iter(), PhantomData)
    }
}


impl<'a, T: FlagsMarker + PartialEq> Query<T> for &'a [T] {
    type Iter<'t> = AsRefStrIter<'t, std::slice::Iter<'t, T>> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        AsRefStrIter(self.iter(), PhantomData)
    }
}

impl<T: FlagsMarker + PartialEq> Query<T> for Vec<T> {
    type Iter<'t> = AsRefStrIter<'t, std::slice::Iter<'t, T>> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        AsRefStrIter(self.iter(), PhantomData)
    }
}

impl<'a, T: FlagsMarker + PartialEq> Query<T> for &'a Vec<T> {
    type Iter<'t> = AsRefStrIter<'t, std::slice::Iter<'t, T>> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        AsRefStrIter(self.iter(), PhantomData)
    }
}

impl<T: FlagsMarker + PartialEq> Query<T> for Flags<T> {
    type Iter<'t> = AsRefStrIter<'t, std::slice::Iter<'t, T>> where T: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        AsRefStrIter(self.0.iter(), PhantomData)
    }
}

impl<T: FlagsMarker + PartialEq> Query<T> for &Flags<T> {
    type Iter<'t> = AsRefStrIter<'t, std::slice::Iter<'t, T>> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        AsRefStrIter(self.0.iter(), PhantomData)
    }
}

impl<T: FlagsMarker + PartialEq> Query<T> for &&Flags<T> {
    type Iter<'t> = AsRefStrIter<'t, std::slice::Iter<'t, T>> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        AsRefStrIter(self.0.iter(), PhantomData)
    }
}

impl<T: FlagsMarker + PartialEq> Query<T> for &&&Flags<T> {
    type Iter<'t> = AsRefStrIter<'t, std::slice::Iter<'t, T>> where Self: 't;
    fn items<'t>(&'t self) -> Self::Iter<'t> {
        AsRefStrIter(self.0.iter(), PhantomData)
    }
}