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
// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).

use core::{
    convert::TryFrom,
    iter::FromIterator,
    ops::{Range, RangeBounds, RangeFrom, RangeFull, RangeInclusive, RangeTo, RangeToInclusive},
};

use super::CodePointInversionListError;
use crate::codepointinvlist::utils::deconstruct_range;
use crate::codepointinvlist::{CodePointInversionList, CodePointInversionListBuilder};
use zerovec::ZeroVec;

fn try_from_range<'data>(
    range: &impl RangeBounds<char>,
) -> Result<CodePointInversionList<'data>, CodePointInversionListError> {
    let (from, till) = deconstruct_range(range);
    if from < till {
        let set = [from, till];
        let inv_list: ZeroVec<u32> = ZeroVec::alloc_from_slice(&set);
        #[allow(clippy::unwrap_used)] // valid
        Ok(CodePointInversionList::try_from_inversion_list(inv_list).unwrap())
    } else {
        Err(CodePointInversionListError::InvalidRange(from, till))
    }
}

impl<'data> TryFrom<&Range<char>> for CodePointInversionList<'data> {
    type Error = CodePointInversionListError;

    fn try_from(range: &Range<char>) -> Result<Self, Self::Error> {
        try_from_range(range)
    }
}

impl<'data> TryFrom<&RangeFrom<char>> for CodePointInversionList<'data> {
    type Error = CodePointInversionListError;

    fn try_from(range: &RangeFrom<char>) -> Result<Self, Self::Error> {
        try_from_range(range)
    }
}

impl<'data> TryFrom<&RangeFull> for CodePointInversionList<'data> {
    type Error = CodePointInversionListError;

    fn try_from(_: &RangeFull) -> Result<Self, Self::Error> {
        Ok(Self::all())
    }
}

impl<'data> TryFrom<&RangeInclusive<char>> for CodePointInversionList<'data> {
    type Error = CodePointInversionListError;

    fn try_from(range: &RangeInclusive<char>) -> Result<Self, Self::Error> {
        try_from_range(range)
    }
}

impl<'data> TryFrom<&RangeTo<char>> for CodePointInversionList<'data> {
    type Error = CodePointInversionListError;

    fn try_from(range: &RangeTo<char>) -> Result<Self, Self::Error> {
        try_from_range(range)
    }
}

impl<'data> TryFrom<&RangeToInclusive<char>> for CodePointInversionList<'data> {
    type Error = CodePointInversionListError;

    fn try_from(range: &RangeToInclusive<char>) -> Result<Self, Self::Error> {
        try_from_range(range)
    }
}

impl FromIterator<RangeInclusive<u32>> for CodePointInversionList<'_> {
    fn from_iter<I: IntoIterator<Item = RangeInclusive<u32>>>(iter: I) -> Self {
        let mut builder = CodePointInversionListBuilder::new();
        for range in iter {
            builder.add_range32(&range);
        }
        builder.build()
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::codepointinvlist::CodePointInversionList;
    use core::{char, convert::TryFrom};

    #[test]
    fn test_try_from_range() {
        let check: Vec<char> = CodePointInversionList::try_from(&('A'..'B'))
            .unwrap()
            .iter_chars()
            .collect();
        assert_eq!(vec!['A'], check);
    }

    #[test]
    fn test_try_from_range_error() {
        let check = CodePointInversionList::try_from(&('A'..'A'));
        assert!(matches!(
            check,
            Err(CodePointInversionListError::InvalidRange(65, 65))
        ));
    }

    #[test]
    fn test_try_from_range_inclusive() {
        let check: Vec<char> = CodePointInversionList::try_from(&('A'..='A'))
            .unwrap()
            .iter_chars()
            .collect();
        assert_eq!(vec!['A'], check);
    }

    #[test]
    fn test_try_from_range_inclusive_err() {
        let check = CodePointInversionList::try_from(&('B'..'A'));
        assert!(matches!(
            check,
            Err(CodePointInversionListError::InvalidRange(66, 65))
        ));
    }

    #[test]
    fn test_try_from_range_from() {
        let uset = CodePointInversionList::try_from(&('A'..)).unwrap();
        let check: usize = uset.size();
        let expected: usize = (char::MAX as usize) + 1 - 65;
        assert_eq!(expected, check);
    }

    #[test]
    fn test_try_from_range_to() {
        let uset = CodePointInversionList::try_from(&(..'A')).unwrap();
        let check: usize = uset.size();
        let expected: usize = 65;
        assert_eq!(expected, check);
    }

    #[test]
    fn test_try_from_range_to_err() {
        let check = CodePointInversionList::try_from(&(..(0x0 as char)));
        assert!(matches!(
            check,
            Err(CodePointInversionListError::InvalidRange(0, 0))
        ));
    }

    #[test]
    fn test_try_from_range_to_inclusive() {
        let uset = CodePointInversionList::try_from(&(..='A')).unwrap();
        let check: usize = uset.size();
        let expected: usize = 66;
        assert_eq!(expected, check);
    }

    #[test]
    fn test_try_from_range_full() {
        let uset = CodePointInversionList::try_from(&(..)).unwrap();
        let check: usize = uset.size();
        let expected: usize = (char::MAX as usize) + 1;
        assert_eq!(expected, check);
    }

    #[test]
    fn test_from_range_iterator() {
        let ranges = [
            RangeInclusive::new(0, 0x3FFF),
            RangeInclusive::new(0x4000, 0x7FFF),
            RangeInclusive::new(0x8000, 0xBFFF),
            RangeInclusive::new(0xC000, 0xFFFF),
        ];
        let expected =
            CodePointInversionList::try_from_inversion_list_slice(&[0x0, 0x1_0000]).unwrap();
        let actual = CodePointInversionList::from_iter(ranges);
        assert_eq!(expected, actual);
    }
}