classnames 2.0.0

Library for generating BEM style classnames
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

use crate::Class;
use crate::classes::DuoClass;
use crate::classes::OptionClass;
use ::smallvec::SmallVec;
use ::std::borrow::Cow;
use ::std::convert::From;
use ::std::fmt;
use ::std::ops::Add;

const ATTR_SMALL_VEC_SIZE: usize = 3;

#[derive(Clone, PartialEq, Debug)]
pub struct AttrClass<N> {
    parent: N,
    attrs: SmallVec<[&'static str; ATTR_SMALL_VEC_SIZE]>,
}

impl<N> Class for AttrClass<N>
where
    N: fmt::Display + Sized + PartialEq + Clone
{}

impl<N: fmt::Display + Sized> AttrClass<N> {
    pub(crate) fn new(parent: N) -> Self {
        Self {
            parent,
            attrs: SmallVec::new(),
        }
    }

    pub fn attr(self, attr: &'static str) -> Self {
        let mut attrs = self.attrs;
        attrs.push(attr);

        AttrClass {
            parent: self.parent,
            attrs: attrs,
        }
    }

    pub fn maybe_attr(self, attr: &'static str, is_set: bool) -> Self {
        if is_set {
            self.attr(attr)
        } else {
            self
        }
    }
}

impl<N, O> Add<O> for AttrClass<N>
where
    N: Class,
    O: Class,
{
    type Output = DuoClass<Self, O>;

    fn add(self, other: O) -> Self::Output {
        DuoClass::new(self, other)
    }
}

impl<'s, N> Add<&'s str> for AttrClass<N>
where
    N: Class,
{
    type Output = DuoClass<Self, &'s str>;

    fn add(self, other: &'s str) -> Self::Output {
        DuoClass::new(self, other)
    }
}

impl<N, O> Add<Option<O>> for AttrClass<N>
where
    N: Class,
    O: Class,
{
    type Output = DuoClass<Self, OptionClass<O>>;

    fn add(self, other: Option<O>) -> Self::Output {
        DuoClass::new(self, OptionClass::new(other))
    }
}

impl<N: fmt::Display> fmt::Display for AttrClass<N> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{}", self.parent)?;

        for attr in &self.attrs {
            write!(f, " {}--{}", self.parent, attr)?;
        }

        Ok(())
    }
}

impl<'a, N: fmt::Display> From<AttrClass<N>> for Cow<'a, str> {
    fn from(class: AttrClass<N>) -> Self {
        class.to_string().into()
    }
}

impl<'a, N: fmt::Display> From<AttrClass<N>> for String {
    fn from(class: AttrClass<N>) -> Self {
        class.to_string()
    }
}

#[cfg(test)]
mod maybe_attr {
    use crate::*;

    #[test]
    fn is_should_set_attr_if_is_set() {
        let attr = classname("mr-component").attr("large");
        assert_eq!(
            "mr-component mr-component--large mr-component--red",
            attr.maybe_attr("red", true).to_string()
        )
    }

    #[test]
    fn is_should_not_set_attr_if_is_set_is_false() {
        let attr = classname("mr-component").attr("large");
        assert_eq!(
            "mr-component mr-component--large",
            attr.maybe_attr("red", false).to_string()
        )
    }

    #[test]
    fn is_should_still_set_more_attr_after_false_maybe_attr() {
        let attr = classname("mr-component").attr("large");
        assert_eq!(
            "mr-component mr-component--large mr-component--blue",
            attr.maybe_attr("red", false).attr("blue").to_string()
        )
    }
}