generic-str 0.3.1

Annoyed that Rust has two string types? Well it doesn't any more
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

use generic_vec::raw::Storage;

#[cfg(feature = "alloc")]
use generic_vec::HeapVec;
#[cfg(feature = "alloc")]
use std::{
    borrow::Cow,
    ops::{Add, AddAssign},
};

use crate::{string_base::StringBase, OwnedString};
use core::{
    ops::{Index, IndexMut},
    slice::SliceIndex,
};

impl AsRef<str> for StringBase<[u8]> {
    fn as_ref(&self) -> &str {
        unsafe { core::str::from_utf8_unchecked(&self.storage) }
    }
}

impl AsMut<str> for StringBase<[u8]> {
    fn as_mut(&mut self) -> &mut str {
        unsafe { core::str::from_utf8_unchecked_mut(&mut self.storage) }
    }
}

impl<I> Index<I> for StringBase<[u8]>
where
    I: SliceIndex<StringBase<[u8]>>,
{
    type Output = I::Output;

    #[inline]
    fn index(&self, index: I) -> &I::Output {
        index.index(self)
    }
}

impl<I> IndexMut<I> for StringBase<[u8]>
where
    I: SliceIndex<StringBase<[u8]>>,
{
    #[inline]
    fn index_mut(&mut self, index: I) -> &mut I::Output {
        index.index_mut(self)
    }
}

impl<S: ?Sized + Storage<Item = u8>> core::fmt::Debug for OwnedString<u8, S> {
    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
        let s: &StringBase<[S::Item]> = self.as_ref();
        let s: &str = s.as_ref();
        write!(f, "{:?}", s)
    }
}

impl<S: ?Sized + Storage<Item = u8>> core::fmt::Display for OwnedString<u8, S> {
    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
        let s: &StringBase<[S::Item]> = self.as_ref();
        let s: &str = s.as_ref();
        write!(f, "{}", s)
    }
}

impl core::fmt::Debug for StringBase<[u8]> {
    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
        let s: &str = self.as_ref();
        write!(f, "{:?}", s)
    }
}

impl core::fmt::Display for StringBase<[u8]> {
    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
        let s: &str = self.as_ref();
        write!(f, "{}", s)
    }
}

#[cfg(feature = "alloc")]
impl From<String> for StringBase<HeapVec<u8>> {
    fn from(s: String) -> Self {
        let (ptr, len, capacity) = s.into_raw_parts();
        unsafe {
            let ptr = std::ptr::slice_from_raw_parts_mut(ptr.cast(), capacity);
            let storage = Box::from_raw(ptr);
            let storage = HeapVec::from_raw_parts(len, storage);
            Self { storage }
        }
    }
}

#[cfg(feature = "alloc")]
impl From<&str> for StringBase<HeapVec<u8>> {
    fn from(s: &str) -> Self {
        s.to_owned().into()
    }
}

impl From<&str> for &StringBase<[u8]> {
    fn from(s: &str) -> Self {
        unsafe { core::mem::transmute(s) }
    }
}

impl From<&mut str> for &mut StringBase<[u8]> {
    fn from(s: &mut str) -> Self {
        unsafe { core::mem::transmute(s) }
    }
}

impl<'a, S: ?Sized + AsRef<[u8]>> From<&'a StringBase<S>> for &'a str {
    fn from(s: &'a StringBase<S>) -> Self {
        unsafe { core::str::from_utf8_unchecked(s.storage.as_ref()) }
    }
}

#[cfg(feature = "alloc")]
impl<'a> Add<&'a crate::str> for Cow<'a, crate::str> {
    type Output = Cow<'a, crate::str>;

    #[inline]
    fn add(mut self, rhs: &'a crate::str) -> Self::Output {
        self += rhs;
        self
    }
}

#[cfg(feature = "alloc")]
impl<'a> AddAssign<&'a crate::str> for Cow<'a, crate::str> {
    fn add_assign(&mut self, rhs: &'a crate::str) {
        if self.is_empty() {
            *self = Cow::Borrowed(rhs)
        } else if !rhs.is_empty() {
            if let Cow::Borrowed(lhs) = *self {
                let mut s = crate::String::with_capacity(lhs.len() + rhs.len());
                s.push_str(lhs);
                *self = Cow::Owned(s);
            }
            self.to_mut().push_str(rhs);
        }
    }
}