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

// Take a look at the license at the top of the repository in the LICENSE file.

// This is similar to the GVariantIter provided by glib, but that would
// introduce a heap allocation and doesn't provide a way to determine how
// many items are left in the iterator.

use std::iter::{DoubleEndedIterator, ExactSizeIterator, Iterator};

use crate::translate::*;
use crate::variant::Variant;

// rustdoc-stripper-ignore-next
/// Iterator over items in a variant.
#[derive(Debug)]
pub struct VariantIter {
    variant: Variant,
    head: usize,
    tail: usize,
}

impl VariantIter {
    pub(crate) fn new(variant: Variant) -> Self {
        let tail = variant.n_children();
        Self {
            variant,
            head: 0,
            tail,
        }
    }
}

impl Iterator for VariantIter {
    type Item = Variant;

    fn next(&mut self) -> Option<Variant> {
        if self.head == self.tail {
            None
        } else {
            let value = self.variant.child_value(self.head);
            self.head += 1;
            Some(value)
        }
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        let size = self.tail - self.head;
        (size, Some(size))
    }
}

impl DoubleEndedIterator for VariantIter {
    fn next_back(&mut self) -> Option<Variant> {
        if self.head == self.tail {
            None
        } else {
            self.tail -= 1;
            Some(self.variant.child_value(self.tail))
        }
    }
}

impl ExactSizeIterator for VariantIter {}

// rustdoc-stripper-ignore-next
/// Iterator over items in a variant of type `as`.
#[derive(Debug)]
pub struct VariantStrIter<'a> {
    variant: &'a Variant,
    head: usize,
    tail: usize,
}

impl<'a> VariantStrIter<'a> {
    pub(crate) fn new(variant: &'a Variant) -> Self {
        let tail = variant.n_children();
        Self {
            variant,
            head: 0,
            tail,
        }
    }

    fn impl_get(&self, i: usize) -> &'a str {
        unsafe {
            let p: *mut libc::c_char = std::ptr::null_mut();
            let s = b"&s\0";
            ffi::g_variant_get_child(
                self.variant.to_glib_none().0,
                i,
                s as *const u8 as *const _,
                &p,
                std::ptr::null::<i8>(),
            );
            let p = std::ffi::CStr::from_ptr(p);
            p.to_str().unwrap()
        }
    }
}

impl<'a> Iterator for VariantStrIter<'a> {
    type Item = &'a str;

    fn next(&mut self) -> Option<&'a str> {
        if self.head == self.tail {
            None
        } else {
            let v = self.impl_get(self.head);
            self.head += 1;
            Some(v)
        }
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        let size = self.tail - self.head;
        (size, Some(size))
    }
}

impl<'a> DoubleEndedIterator for VariantStrIter<'a> {
    fn next_back(&mut self) -> Option<&'a str> {
        if self.head == self.tail {
            None
        } else {
            self.tail -= 1;
            Some(self.impl_get(self.tail))
        }
    }
}

impl<'a> ExactSizeIterator for VariantStrIter<'a> {}

#[cfg(test)]
mod tests {
    use crate::prelude::*;
    use crate::variant::{DictEntry, Variant};
    use std::collections::HashMap;

    #[test]
    fn test_variant_iter_variant() {
        let v = Variant::from_variant(&"foo".to_string().to_variant());
        let vec: Vec<String> = v.iter().map(|i| i.get().unwrap()).collect();
        assert_eq!(vec, vec!["foo".to_string()]);
    }

    #[test]
    fn test_variant_iter_array() {
        let v = Variant::array_from_iter::<String, _>([
            "foo".to_string().to_variant(),
            "bar".to_string().to_variant(),
        ]);
        let vec: Vec<String> = v.iter().map(|i| i.get().unwrap()).collect();
        let a = vec!["foo".to_string(), "bar".to_string()];
        assert_eq!(&vec, &a);
        let vec: Vec<_> = v.array_iter_str().unwrap().collect();
        assert_eq!(&vec, &a);
    }

    #[test]
    fn test_variant_iter_tuple() {
        let v = Variant::tuple_from_iter([
            "foo".to_string().to_variant(),
            "bar".to_string().to_variant(),
        ]);
        let vec: Vec<String> = v.iter().map(|i| i.get().unwrap()).collect();
        assert_eq!(vec, vec!["foo".to_string(), "bar".to_string()]);
    }

    #[test]
    fn test_variant_iter_dictentry() {
        let v = DictEntry::new("foo", 1337).to_variant();
        println!("{:?}", v.iter().collect::<Vec<_>>());
        assert_eq!(v.iter().count(), 2);
    }

    #[test]
    fn test_variant_iter_map() {
        let mut map = HashMap::new();
        map.insert("foo", 1);
        map.insert("bar", 1);
        let v = map.to_variant();
        assert_eq!(v.iter().count(), 2);
    }
}